Method for improving tire assembly quality

Abstract

The invention discloses a method for improving tire assembly quality, and relates to the technical field of tires. After the method is adopted, the problems of impurities in the tire, folding of the flap, eccentricity of the inflating valve, exceeding of the height of a seam allowance platform and the like in the tire assembling process can be avoided, the early quality problems of puncture and cutting of the impurities in the inner tire, extrusion damage of the flap, damage of the inflating valve and the like in the using process of the tire are prevented, and the using mileage of the tire is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of tires, and in particular to a method for improving tire assembly quality. Background Art

[0002] Every step in the OTR tire assembly line is crucial. However, in reality, haphazard and non-standard operating procedures often lead to numerous safety hazards, directly affecting the tire's ultimate quality and service life. These issues are not isolated but rather interconnected and interdependent, ultimately leading to customer complaints and trouble during use.

[0003] First, improper operating techniques are the root cause of all these problems. When assembling tires, assemblers may fail to strictly follow standard operating procedures (SOPs) due to a lack of rigorous training, a desire to cut corners, rush deadlines, or simply a lack of attention to detail. For example, before placing the inner tube into the outer tire bead, the inside of the bead and the surface of the rim are not carefully cleaned of dust, sand, pebbles, or other residues. This "debris in the tire" problem may seem minor, but it is like a hidden "landmine." When the tire is inflated and put into use, these hard foreign objects move inside the tire along with the inner tube and flap. They can easily puncture or cut the inner tube at high speeds or on bumpy roads, causing air leaks. More seriously, these debris can cause localized wear inside the tire, exacerbating damage to other components.

[0004] Secondly, flap folding is a common and easily overlooked issue. The primary function of the flap is to protect the inner tube from damage caused by the rim and tire edge. However, if the flap is not placed flat against the rim, but is haphazardly curled or folded before being inserted, this can cause a flap fold. This fold creates hard spots that are continuously compressed when the tire is inflated and mounted on the wheel. This prevents the flap from effectively protecting the inner tube and can even cause it to "squeeze" like a sharp object, or even cause the flap itself to rupture, rendering it ineffective.

[0005] Furthermore, valve eccentricity is directly related to tire inflation and sealing. The valve must be installed precisely at the designated valve hole position on the rim, perpendicular to the rim plane. Misalignment during installation, or improper use of installation tools, can cause the valve to tilt, resulting in eccentricity. This not only complicates the installation of the valve, valve core, and valve cap, but more importantly, an eccentric valve experiences uneven force after inflation. Long-term use can cause cracking or wear at the base of the valve, resulting in "valve damage," which can lead to slow air loss or even a blowout.

[0006] Finally, the problem of the flap exceeding the height of the bead platform is also extremely harmful. The bead platform is a key part of the rim that supports the tire bead. The design length and width of the flap should ensure that it is completely within the range of the bead platform. If it is handled improperly, such as choosing the wrong flap size, or it is placed beyond the range, the excess part will directly cover the bead platform. When the tire is inflated and bearing weight, the excess flap will be forcibly squeezed between the tire bead and the rim. Not only will it fail to protect the inner tube, but it will be "squeezed" or even torn due to excessive pressure. At the same time, this hard object sandwiched between the bead and the rim will also cause damage to the bead itself, affecting its airtightness and service life.

[0007] These initial defects introduced during the assembly process are like time bombs, gradually unleashing their destructive power after the tires are put into use. Punctures and cuts on the inner tube can lead to sudden, unnoticed deflation or even blowouts, posing a significant safety hazard. A squeezed and ineffective flap protects the inner tube, similarly causing air leaks. Damage to the valve stem directly leads to difficulty in inflation and air leaks, compromising normal use. The collective occurrence of these early quality issues directly results in a poor user experience, triggering numerous customer complaints. This not only harms the interests of users but also severely impacts the reputation of tire and construction vehicle manufacturers, increasing the cost and pressure of after-sales service. Therefore, strengthening process quality control is key to ensuring product quality, improving customer satisfaction, and mitigating operational risks. Summary of the Invention

[0008] The technical problem to be solved by the present invention is: to overcome the shortcomings of the existing technology and provide a method for improving the quality of tire assembly, which can avoid problems such as tire debris, folded flaps, eccentric valve stems, and flaps exceeding the height of the sub-mouth platform during the tire assembly process, prevent early quality problems such as punctures and cuts on the inner tube by debris, squeezed flaps, and valve stem damage during tire use, and improve the mileage of the tire.

[0009] The technical solution of the present invention is:

[0010] Methods to improve tire assembly quality:

[0011] 1) The tire is tilted before the inner cushion is assembled, and then the tire cavity is cleaned before the inner tube and flap are filled. In the traditional upright tire placement method, the inner tube surface is relatively smooth. During the inner tube filling process, the inner tube at the upper position is affected by gravity and easily falls out of the tire cavity, making assembly difficult. In the present invention, the tire is tilted. After the inner tube is filled into the tire cavity, it will fall into the lower tire cavity and generate friction with it. The friction force is relatively greater than that of the tire placed upright, thus improving the problem of the inner tube falling off during assembly and facilitating the flap assembly.

[0012] 2) After the inner cushion is assembled and before the tire is pre-inflated, use a tool to slide the edge of the flap belt circumferentially at the interface between the inner tube and the tire, and do this on both sides of the tire in sequence. Because the edge of the flap belt is relatively thin, it is prone to irregular deformation or folding during the inner cushion assembly process. Therefore, the present invention uses a tool to slide the edge of the flap belt at the interface between the inner tube and the tire, which helps to identify the areas where the flap belt is severely folded or deformed, and then unfold it. Otherwise, the folded areas of the flap belt may cause the inner tube to tear during high-load and high-speed rolling of the tire, resulting in customer complaints.

[0013] 3) Pre-inflate the tire after the inner pad is assembled. Before pre-inflation, remove the valve core of the inner tube, and then control the first pre-inflation time of the tire according to the inner tube specifications so that the inner tube can be hung in the tire cavity, and then stop the first pre-inflation; at this time, turn the valve position to the bottom, adjust the valve nut to be concentric with the circular hole of the pad copper sheet, then fix the valve stem, and knock the pad protruding from the height of the sub-mouth platform until the circumference of the pad does not exceed the height of the sub-mouth platform; then perform the second pre-inflation; the present invention pre-inflates the tire twice. Compared with the current production process of completing tire pre-inflation at one time, it can reduce the speed of inner tube expansion and reserve the best time for adjusting the position of the valve and pad, thereby ensuring that the valve position and pad position meet the assembly requirements, avoiding the inner pad damage caused by the non-concentricity, deviation and pad position problems between the valve and pad, and improving the overall mileage of the tire;

[0014] 4) During the second pre-inflation process, the inner width of the spigot is measured to ensure that the inner width of the spigot is 110-130% of the design width, and then the valve core and valve mouth are installed in place. If the inner width of the spigot is too small during the second pre-inflation, the tire cavity will be deformed by the gravity of the tire during the stacking and transportation of the tires. During the deformation process, the inner tube gas is passively squeezed to the inner width position of the spigot, and this position gradually changes from the original flatness to an outward-convex arc. The flap is squeezed, creeps, and displaced little by little, and eventually exceeds the height of the spigot platform, affecting the tire assembly quality. By controlling the inner width of the spigot during pre-inflation according to the present invention, the supporting force of the inner tube on the outer tire side and the restraining force of the flap can be effectively guaranteed during the stacking process, thereby avoiding the problem of the flap being squeezed out.

[0015] Preferably, in step 1), the tilted placement angle is 10°-30°.

[0016] Preferably, in step 1), a vacuum cleaner is used to clean the tire cavity.

[0017] Preferably, in step 2), the tool used is a screwdriver wrapped with plastic wrap.

[0018] Preferably, in step 2), each side slides for ≥2 weeks.

[0019] Preferably, in step 3), the first pre-filling time is 10-50 seconds, and the second pre-filling time is 10-60 seconds.

[0020] Preferably, in step 3), a rubber hammer is used to knock the gaskets on both sides of the valve stem until the valve stem nut and the circular hole of the gasket copper sheet are adjusted to be concentric.

[0021] Preferably, in step 3), a rubber hammer is used to strike the position of the pad symmetrically at the height of the protruding sub-mouth platform.

[0022] Preferably, in step 4), a tape measure is used to measure the inner width of the spout.

[0023] Ideally, after inflation and before rim assembly, the tires should be stacked in stacks of ≤7 tires per stack, and the stacking cycle should be ≤15 days. Increasing the number of tires stacked or the number of days they are stacked can cause severe sidewall deformation of the tires below the stack, potentially causing the tire belt to squeeze out of the tire, hindering tire assembly. Controlling the number and duration of tire stacking can effectively avoid similar quality issues.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] After adopting the method of the present invention, problems such as debris in the tire, folded flaps, eccentric valve stems, and flaps exceeding the height of the sub-mouth platform can be avoided during the tire assembly process, and early quality problems such as punctures and cuts of the inner tube by debris, squeezed flaps, and valve stem damage caused by these problems can be prevented during the use of the tire, thereby improving the mileage of the tire. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the cushion belt in the present invention.

[0027] Figure 2 It is a schematic diagram of the valve nut and the copper sheet of the gasket in the present invention being concentric.

[0028] In the picture, 1. Gasket; 2. Valve nut; 3. Copper sheet. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention.

[0030] Example 1

[0031] The method of improving the assembly quality of 16.00R25 tires in this embodiment is as follows:

[0032] 1) Before assembling the inner pad, the tire is tilted at an angle of 20°, and then the tire cavity is cleaned with a vacuum cleaner, and then the inner tube and pad 1 are filled;

[0033] 2) After the inner pad is assembled and before the tire is pre-inflated, use the tip of a screwdriver wrapped with plastic wrap to align the pad tape 1 (such as Figure 1 Circumferential sliding is performed at the interface between the edge (shown) and the inner tube, and this is performed on both sides of the tire in turn;

[0034] 3) Pre-inflate the tire after the inner pad is assembled. Before pre-inflation, remove the valve core of the inner tube, and then control the first pre-inflation time of the tire to 30s according to the inner tube specifications, so that the inner tube can be hung in the tire cavity, and then stop the first pre-inflation; at this time, turn the valve nozzle to the bottom, use a rubber hammer to knock the pads 1 on both sides of the valve nozzle until the valve nozzle nut 2 is adjusted to be concentric with the circular hole of the copper sheet 3 of the pad 1 (such as Figure 2 Then, fix the valve stem and use a rubber hammer to symmetrically strike the position where the cushion strip 1 protrudes from the height of the spigot platform until the cushion strip 1 does not exceed the height of the spigot platform in any circumferential direction. Then, perform a second pre-inflation, with a time of 50 seconds.

[0035] 4) During the second pre-inflation process, use a tape measure to measure the inner width of the valve opening to ensure that the inner width of the valve opening is 120% of the design width, and then install the valve core and valve stem in place;

[0036] 5) After the tires are inflated and before the rims are assembled, the tires should be stacked in stacks of 7 tires each, and the stacking cycle is 15 days.

[0037] Comparative Example 1

[0038] The difference between Comparative Example 1 and Example 1 is that the operation method is as follows:

[0039] 1) Before the inner pad is assembled, the tire is placed upright without any tilting angle, and the tire cavity is not vacuumed and cleaned, and the inner tube and pad 1 are directly filled;

[0040] 2) After the inner pad is assembled, the valve core of the inner tube is removed and the inflation operation is carried out directly, and the state of the inflated tire is perceived and controlled by visual inspection;

[0041] 3) After inflation, install the valve core and stack them. The number of each stack is 12, and the stacking cycle is 20 days.

[0042] The tires produced in Example 1 and Comparative Example 1 were subjected to performance tests. The test results are shown in Table 1:

[0043] Table 1 Performance test results of tires produced in Example 1 and Comparative Example 1

[0044] From the comparison between Example 1 and Comparative Example 1 in Table 1, it can be seen that after adopting the method of the present invention, problems such as tire debris, folding of the flap 1, eccentricity of the valve stem, and flap 1 exceeding the height of the sub-mouth platform can be avoided during the tire assembly process, and early quality problems such as punctures and cuts caused by debris on the inner tube, squeezing of the flap 1, and damage to the valve stem during the use of the tire can be prevented, thereby improving the mileage of the tire.

Claims

1. A method for improving tire assembly quality, characterized in that: 1) The tire is tilted before the inner cushion is assembled, and then the tire cavity is cleaned, and then the inner tube and cushion strip (1) are filled; 2) After the inner cushion is assembled and before the tire is pre-inflated, use a tool to slide the edge of the cushion strip (1) circumferentially at the interface between the inner tire and the tire, and do this on both sides of the tire in turn; 3) Pre-inflate the tire after the inner pad is assembled. Before pre-inflation, remove the valve core of the inner tube, and then control the first pre-inflation time of the tire according to the inner tube specifications so that the inner tube can be hung in the tire cavity, and then stop the first pre-inflation; at this time, turn the valve mouth position to the right bottom, adjust the valve mouth nut (2) and the circular hole of the copper sheet (3) of the pad (1) to be concentric, then fix the valve stem, and knock the pad (1) to the position where the protruding sub-mouth platform is at a height until the pad (1) does not exceed the sub-mouth platform height in the circumferential direction; then perform the second pre-inflation; 4) During the second pre-inflation process, measure the inner width of the sub-mouth to ensure that the inner width of the sub-mouth is 110-130% of the design width, and then install the valve core and valve stem in place.

2. The method for improving tire assembly quality according to claim 1, wherein: In step 1), the tilting angle is 10°-30°.

3. The method for improving tire assembly quality according to claim 1, wherein: In step 1), when cleaning the tire cavity, a vacuum cleaner is used to remove dust.

4. The method for improving tire assembly quality according to claim 1, wherein: In step 2), the tool used is a screwdriver wrapped with plastic wrap.

5. The method for improving tire assembly quality according to claim 1, wherein: In step 2), slide for ≥ 2 weeks on each side.

6. The method for improving tire assembly quality according to claim 1, wherein: In step 3), the first pre-inflation time is 10-50s, and the second pre-inflation time is 10-60s.

7. The method for improving tire assembly quality according to claim 1, wherein: In step 3), use a rubber hammer to knock the gaskets (1) on both sides of the valve until the valve nut (2) is adjusted to be concentric with the circular hole of the copper sheet (3) of the gasket (1).

8. The method for improving tire assembly quality according to claim 1, wherein: In step 3), use a rubber hammer to knock the pad (1) symmetrically to the left and right to raise the height of the sub-mouth platform.

9. The method for improving tire assembly quality according to claim 1, wherein: In step 4), use a tape measure to measure the inner width of the spigot.

10. The method for improving tire assembly quality according to claim 1, wherein: After the tires are inflated and before the rims are assembled, the number of tires stacked should be ≤ 7 and the stacking period should be ≤ 15 days.

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