Radial tire follow-up variable range puncture device

Abstract

The utility model discloses a kind of meridian tire follow-up variable range puncture device, it is related to tire processing technical field, and it includes: roller body unit, roller body unit includes end face output shaft, guide flange and roller body cylinder, three are fixed and can rotate around axis;Guide flange is opened with guide groove along radial direction;Puncture needle unit, puncture needle unit is multiple groups, and is evenly distributed along circumferential direction;Each group of puncture needle unit includes substrate, multiple puncture needles installed on substrate and gyro wheel assembly;Substrate two ends are slidably connected with guide groove;Follow-up variable range mechanism driven by cam profile curve, intelligent adjustment puncture needle extension length, effectively postpone the contact time of puncture needle and rubber and advance the time of separation, to greatly reduce the entry angle and the angle of retreat of puncture needle.This makes the "horn mouth" formed around puncture significantly reduce, fundamentally reduce the risk of quality defects such as empty bag, delamination in subsequent rubber compound process.

Description

Technical Field

[0001] This utility model relates to the field of tire processing technology, specifically a radial tire follow-up variable stroke puncture device. Background Technology

[0002] In radial tire production, multiple layers of rubber compounds, including the ply, sidewall, and tread, need to be laminated. To ensure effective lamination, air bubbles between the layers must be fully expelled to prevent quality defects such as voids and delamination during subsequent vulcanization. Current tire manufacturing processes typically include a perforating device before the lamination process. This device evenly perforates various rubber compounds, and during the lamination process, extrusion and other methods are used to thoroughly remove air bubbles. Simultaneously, the extrusion seals the perforations, ensuring the rubber compound is dense.

[0003] Currently, most piercing devices in equipment use a piercing roller type. The surface of the piercing roller is evenly distributed with numerous piercing needles, and both ends of the piercing roller are connected to the frame via bearing seats, allowing the piercing roller to rotate around its axis. Depending on the process, it can be driven passively or actively, and used in pairs with prismatic rollers. The rubber material is conveyed via a conveyor belt, and as it passes between the piercing roller and the prismatic roller, the piercing needles evenly penetrate the rubber material. This piercing method ensures continuous production and high efficiency.

[0004] A search revealed a Chinese patent with publication number CN212400413U, which discloses a tire forming puncture device, comprising: a tire forming machine sidewall pressing wheel, a disc, and a first puncture needle; the diameter of the disc is smaller than that of the tire forming machine sidewall pressing wheel, the disc is fixed on the tire forming machine sidewall pressing wheel, and the two are coaxially arranged; the first puncture needle is arranged on the sidewall of the disc along the diameter direction, and the tip of the first puncture needle points away from the diameter of the disc. Compared with manual puncture, the tire sidewall and toe bead puncture time using this device is only 15 seconds, while manual puncture takes 100 seconds. Furthermore, this device can ensure the depth and uniformity of the punctures, while manual puncture is affected by human factors, and the depth and uniformity of the punctures cannot be guaranteed. However, in the piercing process of radial semi-steel tire production, the existing technology has an angle between the piercing angle and the retraction angle of the piercing needle, which causes a flared mouth to form around the piercing of the rubber compound. This can easily lead to quality defects such as voids and delamination when the rubber compound is compounded in the later stage.

[0005] Therefore, based on the above-mentioned search and combined with existing technologies, a radial tire follow-up variable stroke puncture device is proposed to solve the above problems. Utility Model Content

[0006] The purpose of this invention is to provide a radial tire follow-up variable stroke puncture device to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: A radial tire follow-up variable stroke piercing device includes: a roller unit, which includes an end face output shaft, a guide flange, and a roller cylinder, the three of which are fixedly connected and can rotate around an axis; a guide groove is formed radially on the guide flange; a piercing needle unit, which consists of multiple sets of piercing needles evenly distributed along the circumference; each set of piercing needle units includes a base plate, multiple piercing needles mounted on the base plate, and a roller assembly; both ends of the base plate are slidably engaged with the guide groove; the piercing needles can extend or retract through holes in the roller cylinder; and an electromagnetic heating unit. The unit includes a main shaft, a support structure fixed to the main shaft, and an electromagnetic induction coil wound on the support structure; the main shaft is connected to the end face output shaft through a bearing and can be fixed to the frame to remain stationary; a cam is fixed on the main shaft; the needle unit is provided with a roller assembly that abuts against the cam profile, and a spring mechanism that provides preload to make the roller assembly press against the cam; the profile curve of the cam is configured such that when the needle unit rotates with the roller unit to the lowest point, the needle extends to its longest point, and when it rotates to the highest point, the needle retracts to its shortest point.

[0008] Preferably, the profile curve of the cam is such that its far rest position corresponds to the lowest point of the roller cylinder, and its near rest position corresponds to the highest point of the roller cylinder.

[0009] Preferably, the spring mechanism includes a spring bracket and a spring, the spring bracket being fixed on the base plate, and the spring being installed between the spring bracket and the guide flange and in a pre-compressed state.

[0010] Preferably, the number of needle units is in groups, and they are evenly distributed along the circumference.

[0011] Preferably, the support structure includes multiple support plates fixed to the main shaft, and a coil bracket fixed to the support plates, with an electromagnetic induction coil wound around the coil bracket.

[0012] Preferably, the electromagnetic heating unit further includes a temperature measuring element mounted on its support structure.

[0013] Compared with the prior art, the beneficial effects of this utility model are: 1. In this invention, the follow-up variable stroke mechanism driven by the cam profile curve intelligently adjusts the extension length of the piercing needle, effectively delaying the contact time between the piercing needle and the rubber material and advancing the separation time, thereby significantly reducing the entry angle and exit angle of the piercing needle. This significantly reduces the "flared mouth" formed around the piercing hole, fundamentally reducing the risk of quality defects such as empty packages and delamination in subsequent rubber compounding processes, significantly improving the piercing hole quality, and reducing the product defect rate; 2. In this invention, electromagnetic induction heating is used to directly heat the needle substrate, resulting in a thermal efficiency far exceeding that of traditional electric heating tubes. Simultaneously, the electromagnetic heating unit is fixed to the frame via a main shaft and does not rotate with the roller, eliminating the need for the slip ring structure required in traditional rotary heating. This allows for direct wire output, fundamentally avoiding malfunctions caused by slip ring wear and poor contact, and significantly improving the stability and service life of the equipment. 3. In this invention, the innovative cam mechanism design causes the distance between the needle unit and the electromagnetic induction coil to change periodically during rotation. Near the resting position, the close distance results in high heating efficiency; near the far resting position, the greater distance provides ample space for heat dissipation from the induction coil. This synergistic effect of "near-side heating and far-side heat dissipation" ensures rapid heating of the needle while preventing overheating and damage to the coil due to continuous heat accumulation, thus optimizing the thermal management of the entire system. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the overall structure of the needle unit of this utility model; Figure 3 This is a schematic diagram of the exploded structure of this utility model; Figure 4 This is a schematic diagram of the overall structure of the electromagnetic heating unit of this utility model; Figure 5 This is a schematic diagram of the anatomical structure of the present invention; Figure 6 This is a schematic diagram of the piercing roller's entry angle and retraction angle structure of the present invention; Figure 7 This is a schematic diagram of the overall structure of the guide flange of this utility model.

[0015] In the diagram: 1. Needle unit; 2. Needle; 3. Base plate; 4. Roller assembly; 5. Spring bracket; 6. Spring; 7. Electromagnetic heating unit; 8. Electromagnetic induction coil; 9. Coil bracket; 10. Support plate; 11. Main shaft; 12. Roller unit; 13. End face output shaft; 14. Guide flange; 15. Roller cylinder; 16. Bearing. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] In the description of this utility model, it should be noted that the terms "upper", "lower", "inner", "outer", "top", "bottom", "side", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing 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.

[0018] In one typical embodiment of this application, please refer to Figures 1 to 7 As shown, a radial tire follow-up variable stroke puncture device includes: a puncture needle unit 1, an electromagnetic heating unit 7, and a roller unit 12.

[0019] The roller unit 12 consists of an end face output shaft 13, a guide flange 14, and a roller cylinder 15, which are fixed together and form the skeleton of the entire punching roller. During operation, the roller unit 12 is connected to the frame through a bearing seat mounted on the end face output shaft 13, so that the roller unit 12 can rotate synchronously around the axis with the rubber material conveying, realizing continuous punching.

[0020] The needle unit 1 consists of needles 2, a base plate 3, a roller assembly 4, a spring bracket 5, and a spring 6. Twenty sets of needle units 1 are arrayed within the entire needle roller, evenly distributed along the circumference. The guide flange 14 has equally wide grooves evenly distributed radially. Both ends of the base plate 3 engage with the grooves of the guide flange 14, allowing each needle unit 1 to move radially along the guide grooves. The needles 2 are equidistantly mounted on the base plate 3. When each needle unit 1 moves radially, the needles 2 extend and retract from the roller body through evenly distributed small holes on the roller cylinder 15, adjusting the length of the needles 2 exposed outside the roller. The spring 6 is mounted on the spring bracket 5 and installed within the circular hole of the guide flange 14. The length of the spring 6 is greater than the depth of the hole; in the assembled state, the spring 6 is in a pre-tightened state. The roller assembly 4 is fixed to both sides of the base plate 3. Under the pre-tightening force of the spring 6, the rollers of the roller assembly 4 are tightly pressed against the outer surface of the cam. When the piercing roller rotates, driven by the roller body unit 12, the 20 sets of piercing needle units 1 adjust the extension length of the piercing needles 2 according to the cam profile curve. The cam is fixed to the main shaft 11.

[0021] The electromagnetic heating unit 7 is located in the core of the roller body. The main shaft 11 is fixedly connected to the coil support 9, and a support plate 10 evenly distributed along the circumferential direction is fixedly connected to it, forming a cage structure. The electromagnetic induction coil 8 is tightly wound on the support plate 10. The main shaft 11 is a hollow structure, and the induction coil exits through the hollow hole of the main shaft 11 and connects to an external frequency converter. The electromagnetic heating unit 7 also includes a temperature measuring element mounted on its support structure, which is mounted on the support plate 10. The electromagnetic induction coil 8 heats the needle 2 by heating the substrate 3, and the temperature of the needle 2 is controlled by the temperature measuring unit. The main shaft 11 of the electromagnetic heating unit 7 and the end face output shaft 13 are connected by a bearing 16 to realize the relative rotational movement of the roller body unit 12 and the electromagnetic heating unit 7. The shaft length of the main shaft 11 is greater than the length of the end face output shaft 13, and the flat wires at both ends extend out of the shaft holes of the end face output shaft 13 and can be connected to the fixed bracket on the frame, so that the electromagnetic heating unit 7 remains stationary. Heating the piercing needle unit 1 using the electromagnetic heating unit 7 effectively improves piercing efficiency. Compared to the electric heating tube structure used in traditional piercing devices, the electromagnetic heating unit 7 has higher heating efficiency. Furthermore, since the electromagnetic heating unit 7 does not roll with the roller, it does not require a slip ring for power supply and can be directly powered, effectively reducing the failure rate compared to the slip ring power supply structure of traditional heating methods.

[0022] To ensure effective piercing of the rubber compound, the far-end position of the cam profile is installed at the lowest point of the roller, and the near-end position is installed at the highest point. This means that during the cam's push stroke, the needle 2 gradually extends, reaching its maximum extension when it is completely perpendicular to the rubber compound; during the cam's return stroke, the needle 2 gradually shortens. This structure ensures that, under the same operating conditions, the needle 2 of the variable-stroke piercing roller contacts the rubber compound later and disengages earlier, resulting in a smaller flared opening and effectively reducing the possibility of cavities between the rubber compounds. Furthermore, due to the characteristics of the cam profile curve, the distance between the electromagnetic heating coil and the heated substrate 3 varies. Near the near-end position of the cam, the substrate 3 is close to the induction coil, ensuring heating efficiency; near the far-end position, the substrate 3 is farther from the induction coil, facilitating heat dissipation in confined spaces, preventing excessive coil temperature, and extending service life.

[0023] Working process of the follow-up variable stroke licker roller: a. When the piercing device is powered on, the electromagnetic heating unit 7 starts to work. Under the action of the electromagnetic induction coil 8, the substrate 3 of the piercing unit 1 near the rest position is rapidly heated. Through heat conduction, the piercing needle 2 is also heated to the preset temperature. b. Rubber material from the ply or sidewall is conveyed to the inlet of the piercing device via a conveyor belt, and the roller unit 12 begins to rotate synchronously around the axis at the same linear velocity. At this time, since the two ends of the main shaft 11 are fixed to the frame, the electromagnetic heating unit 7 remains stationary. Since the cam is fixed to the main shaft 11, the cam also remains stationary, maintaining its near and far rest positions. c. Driven by the rotation of the roller cylinder 15, the 20 sets of needle units 1 also begin to revolve synchronously around the main shaft 11. Under the action of the spring 6, the roller assembly 4 of each needle unit 1 is pressed tightly against the cam. Since the needle unit 1 is engaged with the guide groove of the guide flange 14, it only has radial freedom. Therefore, driven by the cam profile curve, each needle unit 1 adjusts the extension length of the needle 2 as the roller cylinder 15 rotates. At the lowest point of the roller, the needle 2 extends the longest, and at the highest point of the roller, the needle 2 extends the shortest. d. Taking one set of needles 2 as an example, the rubber material is fed from left to right, and the roller unit 12 rotates clockwise. When it reaches point O, the needle 2 contacts the rubber material and begins to penetrate. At this time, the angle ∠aob between the needle 2 and the rubber material is the penetration angle of the needle 2. e. As the rubber material continues to be fed, the piercing roller continues to rotate, the angle between the piercing needle 2 and the rubber material gradually decreases, and the depth of the piercing needle 2 into the rubber material gradually increases until the piercing needle 2 is perpendicular to the rubber material, the angle decreases to zero, and the tip of the piercing needle 2 reaches its lowest point. f. After the roller unit 12 passes the lowest point, the needle 2 forms an angle with the rubber material in the opposite direction, which gradually increases until it reaches o'. At this point, the angle ∠c'o'a' between the needle 2 and the rubber material reaches its maximum, which is the retraction angle of the needle 2. At this point, the needle 2 completely separates from the rubber material. It can be seen that between points o and o', the needle 2 continuously compresses the rubber material, eventually forming an approximate trumpet-shaped opening with a theoretical size of ∠a'o'c' around the puncture hole in the rubber material. Compared to the traditional fixed-length needle 2, the above structure allows the needle 2 to start contacting the rubber material later and to separate earlier under the same working conditions. Therefore, the trumpet-shaped opening is significantly reduced, effectively reducing the possibility of cavity formation between the rubber materials. After the piercing needle 2 separates from the rubber material, it continues to rotate under the drive of the roller cylinder 15. When it passes near the rest position of the cam, it is fully heated again by the electromagnetic heating unit 7 and enters the next round of piercing action. The entire piercing action is continuously cycled until the end of this round of production.

[0024] Working principle: In operation, the piercing device is powered on, and the electromagnetic heating unit 7 begins to work. Its electromagnetic induction coil 8 generates an alternating magnetic field, causing eddy currents to form inside the metal substrate 3 of the piercing needle unit 1, located near the rest position of the cam, and rapidly heating it. The heat is conducted to raise the temperature of the piercing needle 2 to the preset piercing process temperature. Simultaneously, the fabric layer and other adhesive materials are conveyed to the piercing device's inlet via a conveyor belt. The drive system drives the roller unit 12 to rotate around its axis, its linear velocity synchronized with the adhesive material conveying speed. Since the main shaft 11 of the electromagnetic heating unit 7 is fixed at both ends to the frame, the unit and the cam fixed to it remain stationary. Driven by the rotation of the roller unit 12, the 20 sets of piercing needle units 1, evenly distributed along the circumference, revolve accordingly. Under the preload of the spring 6, the roller assembly 4 of each piercing needle unit 1 remains pressed tightly against the stationary cam profile surface. Because the substrate 3 of the piercing needle unit 1 slides into the radial guide groove of the guide flange 14 at both ends, its movement is constrained to be limited to radial movement only. Therefore, during the revolution, the needle unit 1, driven by the cam profile curve, generates radial follow-up motion, thereby adjusting the length of the needle 2 extending beyond the roller cylinder 15 in real time. When its far rest position corresponds to the lowest point of the roller for piercing, and its near rest position corresponds to the highest point of the roller, the needle 2 gradually extends its stroke as it moves towards the rubber material, extending its longest point at the lowest point of the roller perpendicular to the rubber material, ensuring the piercing depth; during its movement away from the rubber material, the return stroke gradually shortens. This follow-up stroke mechanism delays the entry point of the needle 2 into the rubber material and advances the exit point, significantly reducing the entry angle and exit angle of the needle 2. Ultimately, this process significantly reduces the "flare" formed around the pierced area of ​​the rubber material, effectively reducing the risk of cavities during rubber compounding and improving product quality. After the needle 2 separates from the rubber material, it rotates to near the rest position under the drive of the roller body, and is then fully heated again by the electromagnetic heating unit 7, ready for the next round of piercing operation, thereby achieving continuous and efficient cyclic production.

[0025] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A radial tire follow-up variable stroke puncture device, characterized in that: include: The roller unit (12) includes an end face output shaft (13), a guide flange (14) and a roller cylinder (15), which are fixedly connected and can rotate around the axis; the guide flange (14) has a guide groove along the radial direction. The needle unit (1) consists of multiple groups, evenly distributed along the circumference; each group of needle units (1) includes a base plate (3), multiple needles (2) mounted on the base plate (3), and a roller assembly (4); the two ends of the base plate (3) are slidably engaged with the guide groove; the needles (2) can extend or retract through holes in the roller cylinder (15); The electromagnetic heating unit (7) includes a main shaft (11), a support structure fixed to the main shaft (11), and an electromagnetic induction coil (8) wound on the support structure; the main shaft (11) is connected to the end face output shaft (13) through a bearing (16) and can be fixed to the frame to remain stationary; A cam, which is fixed on the main shaft (11); The needle unit (1) is provided with a roller assembly (4) that abuts against the cam profile, and a spring mechanism that provides preload to press the roller assembly (4) against the cam. The profile curve of the cam is configured such that when the needle unit (1) rotates with the roller unit (12) to the lowest point, the needle (2) extends to its longest point, and when it rotates to the highest point, the needle (2) retracts to its shortest point.

2. The radial tire follow-up variable stroke puncture device according to claim 1, characterized in that: The profile curve of the cam makes its far rest position correspond to the lowest point of the roller cylinder (15), and its near rest position correspond to the highest point of the roller cylinder (15).

3. The radial tire follow-up variable stroke puncture device according to claim 2, characterized in that: The spring mechanism includes: A spring bracket (5) and a spring (6) are provided. The spring bracket (5) is fixed on the base plate (3), and the spring (6) is installed between the spring bracket (5) and the guide flange (14) and is in a pre-compressed state.

4. The radial tire follow-up variable stroke puncture device according to claim 1, characterized in that: The number of needle units (1) is 20, which are evenly distributed along the circumference.

5. The radial tire follow-up variable stroke puncture device according to claim 1, characterized in that: The support structure includes multiple support plates (10) fixed to the main shaft (11) and a coil bracket (9) fixed to the support plates (10), with the electromagnetic induction coil (8) wound around the coil bracket (9).

6. The radial tire follow-up variable stroke puncture device according to claim 1, characterized in that: The electromagnetic heating unit (7) also includes a temperature measuring element mounted on its support structure.

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