Apex laminating drum with adjustable diameter

Abstract

The invention belongs to the field of tire manufacturing equipment, and particularly relates to a diameter-adjustable apex laminating drum which comprises an overturning driving mechanism and a drum diameter adjusting mechanism, the overturning driving mechanism comprises a four-bar mechanism and a first inclined connecting rod, and the two ends of the first inclined connecting rod are connected with an air cylinder body and the four-bar mechanism respectively. The four-connecting-rod mechanism comprises a first connecting rod, a second connecting rod, a third connecting rod and a fourth connecting rod which are connected in sequence, the drum diameter adjusting mechanism comprises a lead screw sliding block mechanism, a second inclined connecting rod and a guide sliding block, a restraining through hole is formed in the disc in the radial direction, the guide sliding block is slidably installed in the restraining through hole of the disc, and an open groove structure is formed in the end, close to the main shaft, of the restraining through hole. One end of the guide sliding block is fixedly connected with the first connecting rod, one end of the guide sliding block is connected with the second inclined connecting rod, the second inclined connecting rod is connected with the lead screw sliding block mechanism, and the apex laminating drum with the adjustable diameter has the advantages of being convenient to operate, high in practicability and better in application prospect compared with the prior art.

Description

Technical Field

[0001] This invention belongs to the field of tire manufacturing equipment and relates to the structure of an automatic triangular rubber bonding machine, specifically a triangular rubber bonding drum with an adjustable diameter. Background Technology

[0002] In tire manufacturing, the triangular rubber bonding machine is widely used as a bonding machine for bonding steel wire rings and triangular rubber. A triangular rubber bonding machine typically includes a bonding disc for mounting the steel wire ring and a bonding drum for mounting the triangular rubber. The bonding disc and bonding drum are spaced apart. The bonding drum includes a main shaft and multiple drum plates arranged around the main shaft. The diameter of the bonding drum matches the diameter of the steel wire ring. The main shaft is aligned with the center of the bonding disc. During operation, the triangular rubber tape is first wound around the bonding drum, at which point the tape is cylindrical. The bonding disc or bonding drum is driven to bring them together. When the front end of the cylindrical triangular rubber tape reaches the position of the steel wire ring, the drive is flipped. The driving mechanism drives the drum to flip towards the bonding plate. Since all the drums are connected to the same flipping drive mechanism and use the same drive source, all the drums flip synchronously to form a disc surface. The cylindrical triangular belt is deformed into an annular disc surface by the action of the drum. The inner ring surface of the triangular rubber on the annular disc surface (i.e. the front end surface of the cylindrical triangular rubber) automatically shrinks and fits onto the steel wire ring, completing the combination of the triangular rubber and the steel wire ring. This allows the triangular rubber to be flipped up and then correctly fitted onto the steel wire ring. The distance between the bonding drum and the bonding plate is very critical. If the distance is too close, the drum cannot be flipped up. If the distance is too far, the axial deviation will cause the triangular rubber to not be aligned and fit onto the steel wire ring.

[0003] To overcome the drawbacks of existing bonding drums that rely on numerous slider mechanisms, leading to slider wear after prolonged use, increased costs, and shortened lifespan, Chinese Patent Publication No. CN111055523A provides a bonding drum with an adjustable diameter. (See appendix to this document.) Figure 4In its technical solution, the flipping drive mechanism includes a parallel four-bar linkage and a first oblique link. The four-bar linkage includes first, second, third, and fourth links connected in sequence. The fourth link is away from the main shaft, and the drum plate is fixedly connected to the fourth link. The hinge shafts of the second and third links are installed on the outer edge of the disc on the main shaft. The first oblique link is connected to the second link. During operation, a cylinder drives one end of the first oblique link to move axially, and the other end of the first oblique link pushes or pulls the four-bar linkage, thereby realizing the flipping of the drum plate toward the bonding disc. The diameter adjustment mechanism of the bonding drum includes a setting... The patent application provides a screw-slider mechanism and a second inclined connecting rod on the main shaft. One end of the second inclined connecting rod is connected to the hinge axis of the third and fourth connecting rods, and the other end is connected to the screw-slider mechanism. When the drum diameter needs to be adjusted, the screw-slider mechanism drives the end of the second inclined connecting rod to move axially along the main shaft. The other end of the second inclined connecting rod (the common end of the third and fourth connecting rods) is constrained by the third connecting rod and can only swing up and down around the hinge axis of the second and third connecting rods. When the fourth connecting rod moves away from the main shaft, the distance between the drum plate and the axis increases or decreases, thereby increasing or decreasing the drum diameter. The fitting drum provided by this patent application is based on a parallel four-bar linkage mechanism, which reduces the slider mechanism. Although it achieves adjustable drum diameter, its overall structure still has shortcomings, resulting in low efficiency and insufficient accuracy in spacing adjustment. The structural deficiency lies in the fact that since the hinge axis of the second and third connecting rods is mounted on a disc, when the fourth connecting rod moves away from the main shaft, there is actually a backward swinging motion component (around the hinge axis of the second and third connecting rods). Conversely, when the drum diameter decreases, the fourth connecting rod needs to swing forward. When adjusting the drum diameter, the parallel four-bar linkage ensures that the fourth link moves in a translational motion. However, its structure inevitably causes forward or backward displacement of the fourth link and drum plate. This displacement increases or decreases the initial distance between the bonding drum and the bonding plate. Therefore, after adjusting the bonding drum diameter, the distance between the bonding drum and the bonding plate must be adjusted accordingly. Manually adjusting the distance is inefficient and the accuracy cannot meet the needs of automated production. Adding a distance adjustment mechanism to the entire machine not only increases the cost of the triangular adhesive bonding machine but also increases the risk of system failure. Therefore, it is necessary to improve the bonding drum to enhance its practicality. Summary of the Invention

[0004] The purpose of this invention is to provide a triangular adhesive bonding drum with adjustable diameter that is simple in structure, reliable in operation, and highly practical.

[0005] The technical solutions for achieving the above objectives include the following:

[0006] An adjustable-diameter triangular adhesive bonding drum includes a main shaft, a disk mounted on the main shaft, and several drum plates evenly distributed around the disk. Each drum plate is connected to a flipping drive mechanism and a drum diameter adjustment mechanism. The flipping drive mechanism includes a cylinder body and a transmission assembly. The transmission assembly includes a parallel-moving four-bar linkage and a first inclined linkage. The two ends of the first inclined linkage are respectively connected to the cylinder body and the four-bar linkage. The motion plane of the four-bar linkage passes through the center of the main shaft. The four-bar linkage includes first, second, third, and fourth linkages connected in sequence. The fourth linkage is away from the main shaft. The drum plate is fixedly connected to the fourth linkage. The first inclined linkage is connected to the second linkage. During operation, the cylinder body mounted on the main shaft drives the four-bar linkage to flip through the first inclined linkage, thereby driving the parallel four-bar linkage... The drum plates flip, and all drum plates flip simultaneously to form an annular disk surface. The drum diameter adjustment mechanism includes a lead screw and slider mechanism, a second inclined connecting rod, and a guide slider. The disk has a constraint through hole along the radial direction. The lead screw and slider mechanism is mounted on the main shaft. The guide slider is slidably mounted in the constraint through hole of the disk. The end of the constraint through hole near the main shaft forms an open groove structure. The width of the open groove is not less than the width of the second inclined connecting rod. The end of the guide slider away from the main shaft is fixedly connected to the first connecting rod. The end of the guide slider pointing towards the main shaft is connected to one end A of the second inclined connecting rod. The other end B of the second inclined connecting rod is connected to the lead screw and slider mechanism. When adjusting the fit of the drum diameter, the lead screw and slider mechanism pulls the end B to move axially along the main shaft, and the end A moves in the open groove.

[0007] Furthermore, the lead screw and slider mechanism includes an adjusting screw, a collar, and a guide key. A central hole is provided axially at the center of the end of the main shaft, and a guide groove passing through the central hole is provided on the main shaft surface. The adjusting screw is rotatably installed in the central hole. The thickness of the guide key is adapted to the width of the guide groove and is installed in the guide groove. The middle part of the guide key is threadedly installed on the adjusting screw. The collar is slidably fitted on the main shaft. Both ends of the guide key are fixedly connected to the inner wall of the collar, and the end B is connected to the outer side of the collar.

[0008] Furthermore, the guide key is provided with a locking bolt, which is used to fix the position of the guide key on the adjusting screw.

[0009] Furthermore, both the first and second inclined connecting rods are deployed on the same side of the disk. Placing the drum diameter adjustment structure and the tilting drive mechanism on the same side helps to shorten the axial length of the fitting drum. Furthermore, the first inclined connecting rod is connected to the second and third connecting rods via a common hinge axis. This coaxial connection of the three rods helps to simplify the mechanism.

[0010] When using the aforementioned bonding drum, if the drum diameter needs adjustment, the adjusting screw-slider mechanism causes the second inclined connecting rod to pull the guide slider to move radially along the disc within the constraint through hole. This moves the entire four-bar linkage away from or towards the main shaft. The drum plates and the four-bar linkage follow suit. When all drum plates move away from the main shaft, the drum diameter increases; when all drum plates move closer to the main shaft, the drum diameter decreases. During diameter adjustment, because the four-bar linkage only has simple radial movement, the following drum plates also only have simple radial movement, with no axial deviation. This ensures that the initial distance between the bonding drum and the bonding disc remains constant. After adjusting the drum diameter, there is no need to adjust the distance between the bonding drum and the bonding disc, ensuring stable operation of the automatic bonding machine. This represents a significant improvement over existing technologies.

[0011] Unless otherwise specified, the connection between the connecting rod, cylinder, and inclined connecting rod described in this invention is assumed to be hinged. It should also be noted that after adjusting the diameter of the bonding drum, the working stroke of the cylinder also needs to be adjusted to ensure the drum plate is fully upright. The structural features of this invention ensure that the distance between the bonding disc and the bonding drum remains constant. Adjusting the cylinder stroke only affects the degree of drum plate uprightness and does not change the axial alignment between the triangular adhesive and the steel wire ring. Furthermore, the surface of the bonding disc itself has a limiting function. As long as the cylinder stroke is adjusted to be larger, the drum plate uprightness is supported by the bonding disc surface and does not affect the uprightness of the cylindrical triangular adhesive into a ring-shaped disc. Compared to existing technologies where the precise operation of adjusting the distance between the bonding disc and the bonding drum cannot be too large or too small, this invention offers a more precise solution. The present invention requires lower precision in adjusting the working stroke of the cylinder (even if it is slightly smaller, resulting in a smaller degree of tilting, the shrinkage generated after the cylindrical triangular rubber tilts is sufficient to ensure that the inner wall of the triangular rubber fits onto the wire ring). Compared with the high precision requirement of the prior art in adjusting the distance between the bonding drum and the bonding plate within ±0.5mm, the present invention's embodiment can meet normal operation with an adjustment precision of ±3mm for adjusting the cylinder stroke. This can be achieved using the original cylinder stroke adjustment mechanism without adding a special adjustment mechanism. The present invention has a wider tolerance range, is more convenient to operate, and is more practical, with better application prospects than the prior art. Attached Figure Description

[0012] Figure 1 A schematic diagram of a triangular adhesive drum with adjustable diameter, as shown in the embodiment; Figure 2 This is a schematic diagram of the disk structure in an embodiment; Figure 3 This is a schematic diagram of the spindle end structure in an embodiment; Figure 4 This is a schematic diagram of a triangular adhesive bonding drum structure with adjustable diameter, based on existing technology.

[0013] In the diagram, 1. Main shaft; 1-1. Center hole; 1-2. Guide groove; 2. Disc; 2-1. Constraint through hole; 2-2. Open groove; 3. Four-bar linkage; 3-1. First link; 3-2. Second link; 3-3. Third link; 3-4. Fourth link; 4. Cylinder body; 5. First inclined link; 6. Screw-slider mechanism; 6-1. Adjusting screw; 6-2. Collar; 6-3. Guide key; 6-4. Locking bolt; 7. Second inclined link; 8. Guide slider; 9. Limiting screw. Detailed Implementation

[0014] The present invention will be specifically described below with reference to the embodiments.

[0015] See Figures 1 to 3 An adjustable-diameter triangular adhesive bonding drum includes a main shaft 1, a disc 2 mounted on the main shaft 1, and several drum plates evenly distributed around the disc 2. Each drum plate is connected to a flipping drive mechanism and a drum diameter adjustment mechanism. The flipping drive mechanism includes a cylinder body 4 and a transmission assembly. The transmission assembly includes a parallel-moving four-bar linkage 3 and a first inclined linkage 5. The two ends of the first inclined linkage 5 are respectively connected to the cylinder body 4 and the four-bar linkage 3. The motion plane of the four-bar linkage 3 passes through the center of the main shaft 1. The four-bar linkage 3 includes a series of sequentially connected... The first, second, third, and fourth connecting rods are connected, with the fourth connecting rod 3-4 located away from the main shaft 1. The drum plate is fixedly connected to the fourth connecting rod 3-4. The first inclined connecting rod 5 is connected to the second connecting rod 3-2. The first inclined connecting rod 5, the second connecting rod 3-2, and the third connecting rod 3-3 are connected by a common hinge axis. The drum diameter adjustment mechanism includes a lead screw and slider mechanism 6, a second inclined connecting rod 7, and a guide slider 8. The disc 2 has a constraint through hole 2-1 along the radial direction. The guide slider 8 is slidably installed in the constraint through hole 2-1 of the disc 2. The end of the constraint through hole 2-1 near the main shaft 1 is open. The groove 2-2 structure has an open groove 2-2 width not less than the width of the second inclined connecting rod 7. The end of the guide slider 8 away from the main shaft 1 is fixedly connected to the first connecting rod 3-1, and the end of the guide slider 8 pointing towards the main shaft 1 is connected to one end A of the second inclined connecting rod 7. The screw-slider mechanism 6 includes an adjusting screw 6-1, a collar 6-2, and a guide key 6-3. A center hole 1-1 is provided axially at the center of the end of the main shaft 1. The cylindrical surface of the main shaft 1 is provided with a guide groove 1-2 passing through the center hole 1-1. The adjusting screw 6-1 is rotatably mounted in the center hole. Inside 1-1, the thickness of the guide key 6-3 is adapted to the width of the guide groove 1-2 and installed inside the guide groove 1-2. The middle part of the guide key 6-3 is threadedly installed on the adjusting screw 6-1. The guide key 6-3 is provided with a locking bolt 6-4, which is used to fix the position of the guide key 6-3 on the adjusting screw 6-1. The collar 6-2 is slidably fitted on the main shaft 1. The two ends of the guide key 6-3 are fixedly connected to the inner wall of the collar 6-2. The other end B of the second inclined connecting rod 7 is connected to the outer side of the collar 6-2.

[0016] During operation, the cylinder body 4 mounted on the main shaft 1 drives the four-bar linkage 3 to rotate via the first inclined connecting rod 5, causing the drum plates connected to the parallel four-bar linkage to rotate. All the drum plates rotate simultaneously to form an annular disc. When it is necessary to adjust the diameter of the fitting drum, the adjusting screw 6-1 is rotated through the center hole 1-1 at the end of the main shaft 1. Under the constraint of the guide groove 1-2, the guide key 6-3 can only move along the axial direction of the main shaft 1 (adjusting screw 6-1). The collar 6-2, which is fixed to the guide key 6-3, moves along with the guide key 6-3. -3 moves axially, and the collar 6-2 pulls the end B of the second inclined connecting rod 7 to move axially along the main shaft 1. Under the constraint of the constraint through hole 2-1, the end A of the second inclined connecting rod 7 can only move radially along the disk 2 within the open slot 2-2. The guide slider 8 is pulled radially by the second inclined connecting rod 7, thereby driving the four-bar linkage 3 to move away from or closer to the axis of the main shaft 1. When all the drums move away from the axis along with the four-bar linkage 3, the drum diameter increases, and vice versa. During the diameter adjustment process, the drums only move radially and do not move axially, ensuring that the distance between the contact drum and the contact disk remains unchanged, thus avoiding the need to adjust the distance between them, which is beneficial to improving work efficiency and ensuring the reliability of the whole system. The limiting screw 9 installed on the main shaft 1 can limit the maximum working stroke of the cylinder body 4 to avoid damage to the cylinder and the four-bar linkage 3.

Claims

1. A triangular adhesive bonding drum with adjustable diameter, comprising a main shaft, a disc mounted on the main shaft, and a plurality of drum plates evenly arranged around the disc, each drum plate being connected to a flipping drive mechanism and a drum diameter adjustment mechanism. The flipping drive mechanism includes a cylinder mounted on the main shaft and a transmission assembly. The transmission assembly includes a parallel-moving four-bar linkage and a first inclined linkage. The two ends of the first inclined linkage are respectively connected to the cylinder and the four-bar linkage. The motion plane of the four-bar linkage passes through the center of the main shaft. The four-bar linkage includes first, second, third, and fourth linkages connected in sequence, with the fourth linkage being away from the main shaft. The drum plate is fixedly connected to the fourth linkage. The first inclined linkage is connected to the second linkage. During operation, the cylinder drives the four-bar linkage to flip via the first inclined linkage, causing the drum plates connected to the parallel four-bar linkage to flip. All drum plates flip simultaneously to form an annular disc surface. The key feature is that... The drum diameter adjustment mechanism includes a lead screw and slider mechanism, a second inclined connecting rod, and a guide slider. The disc has a constraint through hole along the radial direction. The lead screw and slider mechanism is mounted on the main shaft. The guide slider is slidably mounted in the constraint through hole of the disc. The end of the constraint through hole near the main shaft forms an open groove structure. The width of the open groove is not less than the width of the second inclined connecting rod. The end of the guide slider away from the main shaft is fixedly connected to the first connecting rod. The end of the guide slider pointing towards the main shaft is connected to one end A of the second inclined connecting rod. The other end B of the second inclined connecting rod is connected to the lead screw and slider mechanism. When adjusting the drum diameter, the lead screw and slider mechanism pulls the end B to move axially along the main shaft, and the end A moves in the open groove.

2. The diameter-adjustable triangular adhesive bonding drum according to claim 1, characterized in that, The lead screw and slider mechanism includes an adjusting screw, a collar, and a guide key. A central hole is provided axially at the center of the end of the main shaft, and a guide groove is provided on the main shaft surface through the central hole. The adjusting screw is rotatably installed in the central hole. The thickness of the guide key is adapted to the width of the guide groove and is installed in the guide groove. The middle part of the guide key is threadedly installed on the adjusting screw. The collar is slidably fitted on the main shaft. Both ends of the guide key are fixedly connected to the inner wall of the collar, and end B is connected to the outer part of the collar.

3. The adjustable-diameter triangular adhesive bonding drum according to claim 1, characterized in that, The guide key is equipped with a locking bolt, which is used to fix the position of the guide key on the adjusting screw.

4. The adjustable-diameter triangular adhesive bonding drum according to claim 1, characterized in that, The first and second diagonal connecting rods are both deployed on the same side of the disk.

5. The adjustable-diameter triangular adhesive bonding drum according to claim 1, characterized in that, The first diagonal connecting rod is connected to the second and third connecting rods via a common hinge axis.

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