Boosting disc lining for improving bead filler reverse wrapping effect and secondary method forming machine

Abstract

The utility model relates to the field of tire building machines, in particular to a boosting disc lining used for improving the bead filler turn-up effect and a secondary method building machine, the boosting disc lining is arranged at the end of the inner side of a boosting disc in the tire building machine, and the boosting disc lining is arranged in a surrounding mode in the circumferential direction of the boosting disc; the boosting disc lining comprises a connecting part and a pressurizing part; the bottom of the connecting part is connected with the boosting disc; the pressurizing part is connected to the top of the connecting part, and the inner side wall face of the pressurizing part is arranged to be a curved face matched with the surface shape of a to-be-formed tire. Compared with the prior art, the problem that in the prior art, a conventional boosting disc is poor in pushing-over and reverse wrapping effect on high apex and thick apex is solved. According to the scheme, the liner which is molded according to the shape of the surface of the tire is additionally arranged in the boosting disc, so that the apex is pressurized in the turn-up process, the large and thick apex is easily pushed over, the turn-up effect is improved, and the situation that a tire bead part is delaminated is effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a tire building machine, concretely relates to a boost disc bushing for improving the effect of triangular rubber reverse wrapping and a secondary method building machine. BACKGROUND

[0002] The tire building machine (TBM for short) is a kind of tire production special equipment, which combines semi-finished parts (such as tread, sidewall, crown, rubber, carcass, etc.) into a tire blank according to the process requirements in the production and manufacturing process of the tire, and is mainly used in the forming process of radial tires.

[0003] The secondary method building machine divides the tire forming into two stages (one-stage forming and two-stage forming), and completes the assembly of the carcass and the belt / tread respectively to ensure accurate lamination of each part. The forming process using the secondary method building machine is usually as follows: one-stage forming: the lamination of the inner liner, the cord layer and the sidewall rubber is completed on the carcass drum to form a carcass cylinder, and the shaping is completed through reverse wrapping, ring buckling and other steps; two-stage forming: the belt layer and the tread are assembled on the belt drum, and then the belt layer is transferred to the outside of the carcass cylinder, and the final forming is completed through the pressing device.

[0004] CN103171162A discloses a tire building machine and its boost reverse wrapping method, which studies the reverse wrapping operation in the tire forming process. The mechanical boost device (boost disc) on both sides of the forming drum provides axial thrust to the capsule or reverse wrapping rod simultaneously, equally and continuously, so as to assist the capsule or reverse wrapping rod to complete the entire reverse wrapping process, so as to achieve stable pressure, balanced distribution of reverse wrapping operation and improve the quality of tire blank forming. However, the internal structure of the boost disc under the existing structure is usually a "Fang" shaped structure, which causes the boost disc of this form to be difficult to push down for high triangular rubber and thick triangular rubber, and further causes the tire formed to be delaminated at the bead part.

[0005] CN213383108U gives a half-steel radial tire secondary method building machine push triangular rubber device based on a double-stroke air cylinder, which completes the reverse wrapping process by sequentially boosting the capsule reverse wrapping through the double-stroke push structure, and drives the push triangular rubber device to push down the triangular rubber and roll press, so that the triangular rubber on the bead can be uniformly and firmly attached to the attachment part. However, the scheme needs to further add a power mechanism, which greatly increases the production cost; at the same time, the additional action components further increase the complexity and coupling degree of the tire building machine, which further increases the design difficulty, maintenance difficulty and maintenance cost of the equipment.

[0006] Therefore, the present application proposes a boost disc bushing capable of improving the reverse wrapping effect of triangular rubber, which overcomes the phenomenon of poor reverse wrapping effect by simply improving the structure of the boost disc, and the design does not significantly increase the cost. UTILITY MODEL CONTENTS

[0007] The utility model discloses a kind of boost disc bushings for improving the effect of triangular rubber reverse packing and secondary forming machine, to solve the poor effect of pushing down high triangular rubber, thick triangular rubber by conventional boost disc in prior art, improve boost disc and add extra power structure to cause the problem of high cost, difficult maintenance. The present application is by increasing a bushing for the shape of tire surface molding inside boost disc, realizes the boost of triangular rubber in reverse packing process, so that large, thick triangular rubber is also more easily pushed down, improve reverse packing effect, effectively reduce the delamination of tire bead portion.

[0008] The utility model discloses a kind of boost disc bushings for improving the effect of triangular rubber reverse packing and secondary forming machine, to solve the poor effect of pushing down high triangular rubber, thick triangular rubber by conventional boost disc in prior art, improve boost disc and add extra power structure to cause the problem of high cost, difficult maintenance. The present application is by increasing a bushing for the shape of tire surface molding inside boost disc, realizes the boost of triangular rubber in reverse packing process, so that large, thick triangular rubber is also more easily pushed down, improve reverse packing effect, effectively reduce the delamination of tire bead portion.

[0009] The utility model discloses a kind of boost disc bushings for improving the effect of triangular rubber reverse packing and secondary forming machine, to solve the poor effect of pushing down high triangular rubber, thick triangular rubber by conventional boost disc in prior art, improve boost disc and add extra power structure to cause the problem of high cost, difficult maintenance. The present application is by increasing a bushing for the shape of tire surface molding inside boost disc, realizes the boost of triangular rubber in reverse packing process, so that large, thick triangular rubber is also more easily pushed down, improve reverse packing effect, effectively reduce the delamination of tire bead portion.

[0010] The boost disc bushing includes connecting portion and boost portion.

[0011] The bottom of the connecting portion is connected with the boost disc.

[0012] The boost portion is connected with the top of the connecting portion, and the inner side wall surface of the boost portion is provided as a curved surface matching the surface shape of the tire to be formed.

[0013] Preferably, the curved surface includes first curved surface section, second curved surface section and third curved surface section connected in sequence.

[0014] The first curved surface section is a convex surface, and is connected between the inner side wall surface of the connecting portion and the second curved surface section.

[0015] The second curved surface section is a concave surface.

[0016] The third curved surface section is a convex surface, and is connected between the second curved surface section and the top surface of the boost portion.

[0017] Preferably, the curvature radius of the first curved surface section, the second curved surface section and the third curved surface section is 8-10 mm respectively.

[0018] Preferably, a threaded hole is formed in the bottom of the connecting portion, and a through hole is formed in the boost disc corresponding to the threaded hole.

[0019] The connecting portion and the boost disc are threadedly connected through the threaded hole and the through hole by a threaded member.

[0020] Preferably, one or more of the following is included:

[0021] i) the threaded holes are arranged at 8-16 equal intervals along the circumference of the connecting part;

[0022] ii) the threaded holes are arranged at the width center of the bottom surface of the connecting part;

[0023] iii) the threaded holes are M6 or M8;

[0024] iv) the depth of the threaded holes is 30-35mm.

[0025] Preferably, the cross section of the connecting part is rectangular or T-shaped.

[0026] Preferably, the booster disc bushing is arranged as an acute angle reverse blunt.

[0027] Preferably, the booster disc bushing further comprises a supporting ring;

[0028] the supporting ring is sleeved on the outside of the connecting part and the booster part;

[0029] the thickness of the supporting ring is 6-9mm.

[0030] Preferably, the booster disc bushing is made of nylon.

[0031] The second aspect of the utility model discloses a secondary forming machine, which comprises a forming machine body and a booster disc for one-stage forming.

[0032] The booster disc is provided with a pair of booster discs, which are fixedly assembled on the forming machine body and oppositely arranged.

[0033] The inner side end of the booster disc is provided with the booster disc bushing as claimed in any one of the above.

[0034] The working principle of the utility model is as follows:

[0035] By additionally arranging a booster disc bushing with a matching curved surface with the surface of the formed tire in the inside and end of the booster disc, the empty space is occupied during the reverse wrapping process of the booster disc, so that the large and thick triangular rubber can be easily pushed down when the tire to be formed is extruded, and the reverse wrapping effect is improved.

[0036] Compared with the prior art, the utility model has the following beneficial effects:

[0037] The arrangement of the booster disc bushing in the booster disc can assist the pushing down of the large and thick triangular rubber during the tire forming process, thereby improving the reverse wrapping effect and reducing the possibility of delamination of the tire forming tire bead part.

[0038] The boost disc liner is installed at the inner end of the boost disc through thread connection, and is detachable, so that the boost disc liner is convenient to maintain and replace, and can be installed with a boost disc liner with a corresponding curved surface according to different shapes of tires, so that the matched surface shape can assist in guiding and positioning in the forming process, and the performance and quality of the tire after forming are improved.

[0039] The nylon material liner has self-lubricating properties, can reduce the friction and wear of the triangular rubber, and has certain wear resistance and long service life; at the same time, the nylon material is not easy to be bonded with common viscose, so that the triangular rubber is basically not even completely not left on the boost disc liner during the forming process.

[0040] The boost disc liner is used, and the nylon material with certain elasticity and flexibility can relieve the instantaneous impact during the boost disc pushing rubber and reverse wrapping process, reduce the possibility of triangular rubber displacement, and avoid the occurrence of local stress concentration. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 It is a side sectional view structure schematic diagram of the boost disc liner in embodiment 1;

[0042] Figure 2 It is a front view structure schematic diagram of the boost disc liner in embodiment 1;

[0043] Figure 3 It is a side sectional view structure schematic diagram of the boost disc liner in embodiment 2;

[0044] Figure 4 It is a side sectional view structure schematic diagram of the boost disc liner in embodiment 2;

[0045] In the figure:

[0046] 1-boost disc liner; 2-boost disc;

[0047] 11-connection part; 12-boost part; 13-curved surface; 14-thread hole; 15-support ring;

[0048] 21-through hole. DETAILED DESCRIPTION

[0049] The utility model will be described in detail in combination with the drawings and specific embodiments.

[0050] Embodiment 1

[0051] A boost disc liner 1 for improving the reverse wrapping effect of triangular rubber, as shown in Figure 1 、 2As shown, the booster bushing 1 is disposed on the inner end of the booster disk 2 in the tire forming machine, and the booster bushing 1 is disposed around the circumference of the booster disk 2.

[0052] The booster bushing 1 includes a connecting part 11 and a pressurizing part 12;

[0053] The bottom of the connecting part 11 is connected to the booster plate 2;

[0054] The pressurizing part 12 is connected to the top of the connecting part 11, and the inner wall surface of the pressurizing part 12 is set as a curved surface 13 that matches the surface shape of the tire to be formed.

[0055] More specifically, in this embodiment:

[0056] like Figure 1 , 2 As shown, the booster bushing 1 is assembled to the inner end of the booster 2 used for one-stage forming in a two-stage forming machine via a threaded fitting. It consists of three parts: a connecting part 11, a pressurizing part 12, and a support ring 15. The booster bushing 1 is ring-shaped and fits against the inner wall of the booster 2 in a circumferential arrangement.

[0057] The connecting part 11 is the portion that directly connects the booster bushing 1 to the booster 2, and its cross-section is T-shaped or rectangular; in this embodiment, as shown... Figure 1 , 2 In this design, the connecting part 11 is rectangular. A threaded hole 14 is provided on the bottom surface of the connecting part 11 for threaded components (such as bolts or screws) to connect the booster bushing 1 to the booster plate 2. The number of threaded holes 14 can be 8-16 depending on the size of the booster bushing 1. The threaded holes 14 are circumferentially spaced on the bottom surface of the connecting part 11 and are evenly spaced. In this embodiment, 12 M8 threaded holes 14 are evenly spaced, with a depth of 30mm. Each threaded hole 14 is located at the center of the width of the bottom surface of the connecting part 11 to provide a more balanced clamping force, ensuring reliable connection and preventing structural deformation. Corresponding to the threaded holes 14, a through hole 21 (the diameter of the through hole 21 can be slightly larger than the diameter of the threaded hole 14) is provided at the corresponding position on the booster plate 2. The threaded component passes through the through hole 21 of the booster plate 2 and connects with the threaded hole 14 through the threaded connection to achieve the installation of the booster bushing 1 on the booster plate 2.

[0058] The booster section 12 is located at the upper end of the connecting section 11, and the booster section 12 and the connecting section 11 are integral structures. The surface of the booster section 12 facing the annular center is set as a continuously changing curved surface 13, which is consistent with the shape of the tire surface to be formed; the curved surface 13 is specifically composed of a first curved surface segment 13, a second curved surface segment 13, and a third curved surface segment 13 connected in sequence. The first curved surface segment 13 is a convex surface convex outward towards the annular center, the second curved surface segment 13 is a concave surface concave inward away from the annular center, and the third curved surface segment 13 is a convex surface convex outward towards the annular center; one end of the first curved surface segment 13 is connected to the top of the inner wall of the connecting section 11, the second curved surface segment 13 is connected between the first curved surface segment 13 and the third curved surface segment 13, and the third curved surface segment 13 is connected between the second curved surface segment 13 and the top surface of the booster section 12. The radii of curvature of the first 13-segment, the second 13-segment, and the third 13-segment surface can be the same or different. They are usually set to between 8 and 10 mm. In this embodiment, the radii of curvature of the first 13-segment, the second 13-segment, and the third 13-segment surface are all set to 8.35 mm.

[0059] The connecting part 11 and the pressurizing part 12 are made of nylon, which has the following characteristics: good wear resistance and self-lubrication, avoiding damage to the tire; a certain degree of flexibility and elasticity, which can alleviate the instantaneous impact force when the booster disc 2 pushes the rubber, and prevent the triangular rubber from shifting; it does not easily stick to commonly used adhesives, will not affect the normal implementation of the reverse wrapping process, and there is basically no glue residue, so the maintenance and cleaning frequency can be reduced; it is easy to produce, has stable performance at the tire forming temperature, and has a long service life and low operating cost.

[0060] A support ring 15 is sleeved around the connecting part 11 and the pressurizing part 12 to provide structural support for both. Its thickness can be controlled between 6-9 mm, and in this embodiment, a thickness of 8.5 mm is selected. The support ring 15 can be made of cast iron.

[0061] The booster bushing 1 adopts an overall blunted design with sharp angles, and the overall surface roughness is controlled to Ra3.2.

[0062] The inner and outer diameters of the booster bushing 1 are determined according to the size of the tire to be formed. For example, for a 14-inch tire, the outer diameter can be set to 470-490mm and the inner diameter to 370-400mm; for an 18-inch tire, the outer diameter can be set to 580-600mm and the inner diameter to 500-550mm.

[0063] Example 2

[0064] A booster bushing 1 for improving the reverse wrapping effect of triangular rubber, such as Figure 3 , 4 As shown, it is basically similar to the booster bushing 1 given in Embodiment 1, with the main difference being:

[0065] The connecting part 11 adopts a T-shaped cross-section structure. At this time, the threaded hole 14 is only set in the vertical section of the T-shape to facilitate fitting into the booster plate 2 for positioning and limiting, and further cooperate with the threaded parts to complete the installation of the booster plate bushing 1. The support ring 15 is only sleeved on the outer periphery of the booster part 12 and the horizontal section of the T-shape in the connecting part 11. In addition, rounded chamfers are adopted at each corner of the booster plate bushing 1.

[0066] In addition, in this embodiment, the threaded hole 14 is an M6 threaded hole 14 with a depth of 35mm, and eight are equally spaced along the circumference on the bottom surface of the connecting part 11; the corresponding through hole 21 is set as an 8.5mm diameter optical control, which is slightly larger than the diameter of the M6 ​​threaded hole 14.

[0067] In this embodiment, the inner diameter of the connecting part 11 is consistent with the inner diameter of the booster plate 2, and the thickness of the support ring 15 is 7mm.

[0068] Example 3

[0069] A two-stage molding machine includes a molding machine body and a pusher plate 2 for one-stage molding; the pusher plate 2 is provided in pairs and is mounted on the molding machine body facing each other.

[0070] A booster bushing 1, as in Embodiment 1 or Embodiment 2, is fixed to the inner end of the booster 2 by a threaded component.

[0071] The above description of the embodiments is provided to enable those skilled in the art to understand and use the utility model. It will be apparent to those skilled in the art that various modifications can be easily made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present utility model is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present utility model without departing from its scope should be within the protection scope of the present utility model.

Claims

1. A booster disc bushing for improving the reverse wrapping effect of triangular rubber, characterized in that, The booster bushing (1) is located at the inner end of the booster plate (2) in the tire forming machine, and the booster bushing (1) is arranged around the circumference of the booster plate (2). The booster bushing (1) includes a connecting part (11) and a pressurizing part (12); The bottom of the connecting part (11) is connected to the booster plate (2); The pressurizing part (12) is connected to the top of the connecting part (11), and the inner wall of the pressurizing part (12) is set as a curved surface (13) that matches the surface shape of the tire to be formed.

2. The booster disc bushing for improving the reverse wrapping effect of triangular rubber according to claim 1, characterized in that, The surface (13) includes a first surface segment, a second surface segment, and a third surface segment connected in sequence; The first curved surface segment is a convex surface, and the first curved surface segment is connected between the inner wall surface of the connecting part (11) and the second curved surface segment; The second curved surface segment is concave; The third curved surface segment is a convex surface, and the third curved surface segment is connected between the second curved surface segment and the top surface of the pressurizing part (12).

3. A booster disc bushing for improving the reverse wrapping effect of triangular rubber according to claim 2, characterized in that, The curvature radii of the first, second, and third curved surface segments are each 8-10 mm.

4. A booster disc bushing for improving the reverse wrapping effect of triangular rubber according to claim 1, characterized in that, The bottom of the connecting part (11) is provided with a threaded hole (14), and the booster plate (2) is provided with a through hole (21) corresponding to the position of the threaded hole (14); The connecting part (11) and the booster plate (2) are connected by a threaded part passing through the through hole (21) and the threaded hole (14).

5. A booster disc bushing for improving the reverse wrapping effect of triangular rubber according to claim 4, characterized in that, Includes one or more of the following: i) The threaded holes (14) are provided at equal intervals along the circumference of the connecting part (11) in 8-16 places; ii) The threaded hole (14) is located at the center of the width of the bottom surface of the connecting part (11); iii) The specification of the threaded hole (14) is M6 or M8; The depth of the threaded hole (14) described in iv) is 30-35 mm.

6. A booster disc bushing for improving the reverse wrapping effect of triangular rubber according to claim 1, characterized in that, The cross-section of the connecting part (11) is rectangular or T-shaped.

7. A booster disc bushing for improving the reverse wrapping effect of triangular rubber according to claim 1, characterized in that, The booster bushing (1) is designed with a blunted acute angle.

8. A booster disc bushing for improving the reverse wrapping effect of triangular rubber according to claim 1, characterized in that, The booster bushing (1) also includes a support ring (15); The support ring (15) is sleeved on the outside of the connecting part (11) and the pressurizing part (12); The thickness of the support ring (15) is 6-9 mm.

9. A booster disc bushing for improving the reverse wrapping effect of triangular rubber according to claim 1, characterized in that, The booster plate bushing (1) is made of nylon.

10. A two-stage molding machine, characterized in that, Includes the molding machine body and the booster plate for one-stage molding (2); The pusher discs (2) are provided in pairs, and the pusher discs (2) are fixedly mounted on the molding machine body, and the pusher discs (2) are arranged facing each other; The inner end of the booster disk (2) is provided with a booster disk bushing (1) as described in any one of claims 1-9.

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