Method for ensuring the quality stability of the bead of an engineering radial tire

Abstract

This invention discloses a method for ensuring stable bead quality in engineering radial tires, belonging to the field of tire technology. The technical solution is as follows: 1) Before molding, confirm the position of the bladder support block to ensure the distance between the left and right bladder drums and the molding drum meets requirements; 2) Before molding, move the left and right bladder drums inwards towards the molding drum until the support block and the wire bead are concentric; 3) After completing the beading operation at the molding drum station, the pressure of the support block is F1. Then, perform the bonding component pressing and padding bonding operations. After the tire body is reversed and pressed, the bead components are bonded. After the bead components are bonded according to the positioning, the pressure of the support block is F2, where F2 < F1, and then subsequent operations are performed. This invention, through confirming the support block position, controlling the pressure of the support block, adjusting the support block width, and checking the symmetry of the support block position with the center of the molding drum, can avoid quality problems such as insufficient glue in the bead area or a narrow bead width leading to grade degradation.

Description

Technical Field

[0001] This invention relates to the field of tire technology, and specifically to a method for ensuring the stable quality of the bead of an engineering radial tire. Background Technology

[0002] Currently, during the molding process of radial tire blanks for engineering, due to unreasonable process design in some parts, there is a problem of rubber material extrusion and displacement at the bead area during the blank molding process. After the extruded blank is vulcanized, the bead area will have varying degrees of rubber deficiency, which will eventually lead to tire rework or downgrading. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a method to ensure the stable quality of the bead of the engineering radial tire. By confirming the position of the support block, controlling the pressure of the support block, adjusting the width of the support block, and checking the symmetry between the position of the support block and the center of the molding drum, the stability and conformity of the quality of the bead of the engineering radial tire can be effectively improved, and the quality problems of insufficient glue or narrow bead width caused by this can be avoided.

[0004] The technical solution of this invention is as follows: Methods to ensure stable quality of the meridional ferrule in engineering: 1) Before molding, move the left and right capsule drums towards the inside of the molding drum, so that the support block of the capsule drum and the wire ring of the tire blank are concentric. 2) During the molding process, after the tire bead is fastened at the molding drum station, the pressure of the support block is F1. Then, the bonding parts are pressed and the padding is applied. After the tire body is reversed and pressed, the bead components are applied. After the bead components are applied according to the positioning, the pressure of the support block is F2, and F2 < F1. Then, the subsequent operations are carried out.

[0005] Preferably, F2 = 2 / 3F1.

[0006] Preferably, the inner width of the U-shaped groove of the support block is 2.3-3.2 times the width of the tire blank steel wire ring.

[0007] Preferably, before production, the distance between the capsule drum and the forming drum on both sides of the forming reverse packaging drum station is measured each shift. The measured values ​​are recorded as A and B respectively. Subsequent operations can only be carried out when AB≤5mm; otherwise, the machine is stopped for adjustment.

[0008] Preferably, after the incision part of the embryo completes the reverse wrapping and pressing operation, the support block is adjusted from the supported state to the non-supported state before subsequent operations are performed.

[0009] Compared with the prior art, the present invention has the following advantages: This invention effectively improves the stability and conformity of the quality of the beaded part of the engineering meridional tire by confirming the support block position, controlling the pressure of the support block support, adjusting the support block width, and checking the symmetry between the support block position and the center of the molding drum. This avoids quality problems such as insufficient glue or narrow beaded width at the beaded part. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram showing the confirmed position of the capsule support block in this invention.

[0012] Figure 2 This is a schematic diagram comparing the widths of the support block and the wire ring of the tire blank in this invention.

[0013] Figure 3 This is a schematic diagram of the distance between the two capsule drums and the forming drum in this invention.

[0014] In the diagram, 1 is the support block; 2 is the capsule drum; 3 is the wire ring; and 4 is the forming drum. Detailed Implementation

[0015] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this invention.

[0016] Example 1 This embodiment provides a method for ensuring the stable quality of the engineering meridian tire: 1) Before molding, move the left and right capsule drums 2 inwards towards the molding drum 4, so that the support block 1 of the capsule drum 2 and the carcass wire ring 3 are concentric (e.g., Figure 1 As shown), to prevent the bladder drum 2 from being too far or too close to the forming drum 4, which would cause damage to the bead components of the tire blank and result in abnormal material distribution in the bead area; and, the distance of the support block 1 into the forming drum 4 = 1 / 2 the width of the wire ring + the thickness of the tire tube + (5-10) mm, which can prevent the bead components of the tire from being damaged by the support block 1. 2) During the molding process, after the tire bead is fastened on the molding drum 4, the pressure of the support block 1 is F1. Then, the bonding parts are pressed and the padding is applied. After the tire body is reversed and pressed, the bead components are applied. After the bead components are applied according to the positioning, the pressure of the support block 1 is F2, and F2 = 2 / 3F1. Then, the subsequent tire bead padding is applied, and the bead components are reversed and pressed. The reason for reducing the pressure is that support block 1 is mainly made of metal, which is harder than rubber. Before attaching the sub-part, support block 1 mainly supports the area below the wire ring 3. The wire ring 3 is also made of metal, and its rigidity is similar to that of support block 1, so there will be no problem with compression or displacement. However, after attaching the sub-part, the main component of the sub-part is rubber, which is relatively weaker in rigidity than support block 1 and wire ring 3. Moreover, its design position is between the wire ring 3 and support block 1. If support block 1 supports and compresses the sub-part for a long time, it will inevitably cause the sub-part to be squeezed, deformed, and displaced, ultimately leading to abnormal material distribution in the sub-part and resulting in problems with the appearance quality of the finished product. Therefore, reducing the pressure of support block 1 after attaching the sub-part can avoid the above problems.

[0017] Example 2 Based on Example 1, such as Figure 2 As shown, the internal width of the U-shaped groove of the support block 1 is 2.3-3.2 times the width of the tire blank steel wire ring 3. If the support block 1 is too narrow, the ferrule component at the apex of the U-shaped groove will be damaged by the support block 1; if the support block 1 is too wide, the support block 1 will be obliquely deformed due to the misalignment of the force when it is supported for a long time, which will eventually cause quality problems such as missing glue at the ferrule and misalignment at the ferrule.

[0018] Example 3 Based on the previous embodiment, before production, the distance between the capsule drum 2 and the forming drum 4 on both sides of the forming reverse packaging drum station is measured each shift, and the measured values ​​are recorded as A and B respectively (e.g., Figure 3 As shown in the diagram, subsequent operations can only be performed when AB ≤ 5mm; otherwise, the machine must be stopped for adjustment. This is to avoid deviations in the tire blank's support position caused by asymmetry in the bladder drum 2, which would ultimately affect the material distribution at the tire bead.

[0019] Example 4 After the bead components of the tire carcass are finished with the reverse wrapping and pressing operation, the support block 1 is adjusted from the supported state to the non-supported state. Then, subsequent operations such as the bonding and pressing of the sidewall components, the bonding and pressing of the rubber sheet on the tire tube, and weighting are carried out to complete the production of the tire tube. After the bead components are bonded, their position is between the support block 1 and the forming drum 4. If the support block 1 is held up for too long, it will cause indentations in the bead rubber under the pressure of the support block 1. After vulcanization, these indentations will cause bead cracks and missing rubber quality problems. Therefore, after the bead components are bonded, the support block 1 is adjusted from the supported state to the non-supported state to avoid this problem.

[0020] Although the present invention has been described in detail with reference to the accompanying drawings and preferred embodiments, the invention is not limited thereto. Various equivalent modifications or substitutions can be made to the embodiments of the invention by those skilled in the art without departing from the spirit and essence of the invention, and such modifications or substitutions should all be within the scope of the invention. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the invention should also be covered within the protection scope of the invention. Therefore, the protection scope of the invention should be determined by the scope of the claims.

Claims

1. A method for ensuring stable quality of the meridional ferrule in engineering projects, characterized in that, 1) Before molding, move the left and right capsule drums (2) towards the inside of the molding drum (4) so ​​that the support block (1) of the capsule drum (2) and the wire ring (3) of the tire blank are concentric. 2) During the molding process, after the tire ring is fastened at the molding drum (4) station, the pressure of the support block (1) is F1. Then the bonding parts are pressed and the padding is applied. After the tire body is reversed and pressed, the bead parts are applied. After the bead parts are applied according to the positioning, the pressure of the support block (1) is F2, and F2 < F1. Then the subsequent operations are carried out. Before production, the distance between the capsule drum (2) on both sides of the forming drum station and the forming drum (4) is measured for each shift. The measured values ​​are recorded as A and B respectively. Subsequent operations can only be carried out when AB≤5mm, otherwise the machine is stopped for adjustment.

2. The method for ensuring stable quality of the meridional tire as described in claim 1, characterized in that, F2 = 2 / 3F1.

3. The method for ensuring stable quality of the meridional tire as described in claim 1, characterized in that, The width of the U-shaped groove of the support block (1) is 2.3-3.2 times the width of the tire blank steel wire ring (3).

4. The method for ensuring stable quality of the meridional tire as described in claim 1, characterized in that, After the incision part of the embryo completes the reverse wrapping and pressing operation, the support block (1) is adjusted from the supported state to the non-supported state, and then the subsequent operation is carried out.

Images