Method for ensuring repair quality of off-the-road tire

Abstract

The invention discloses a method for guaranteeing the repair quality of an off-the-road tire, and relates to the technical field of tires. According to the method, the position and depth of the defect can be accurately locked and confirmed, the repair cost is reduced, the repair qualification rate and efficiency are improved, the repair quality of the product is improved by standardizing the shape of the repair area, and the problems of tire degradation and early product failure caused by the repair quality are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of tires, and in particular to a method for ensuring the repair quality of tires for construction machinery. Background Art

[0002] In the current field of engineering tire production, the molding process is the key link to ensure tire quality. However, due to the existence of various factors, this link often becomes the source of the problem of bubbles in the tire.

[0003] 1. Causes of defects

[0004] (1) Insufficient equipment precision: After long-term operation, molding manufacturing equipment will inevitably experience problems such as wear and aging, resulting in reduced equipment precision. This lack of precision directly affects the molding quality of the tire, making it easy for defects such as bubbles to form in the tire.

[0005] (2) Improper operation: During the production process, the skill level and operation standard of the operator are directly related to the quality of the tire. Some operators may fail to strictly follow the operating procedures due to lack of skills or negligence, resulting in defects such as bubbles in the tire.

[0006] (3) Inadequate inspection: Quality inspection after tire production is an important step in ensuring product quality. However, due to limitations in inspection equipment and negligence of inspectors, some tires with defects were not discovered and handled in a timely manner.

[0007] These defective tires need to be reworked, but during the process, there are problems such as tire degradation due to abnormalities such as deviation in the repair position and depth, and early failure at the repair position during market use, which cannot continuously meet customer needs. Therefore, in order to solve the problems in the repair process of defective tires, it is necessary to further improve the repair process. Summary of the invention

[0008] The technical problem to be solved by the present invention is: to overcome the shortcomings of the prior art and provide a method for ensuring the quality of engineering machinery tire rework, which can accurately lock and confirm the location and depth of defects, reduce the rework cost, improve the rework pass rate and efficiency, and improve the product rework quality by standardizing the shape of the rework area, thereby avoiding tire degradation and early product failure caused by this.

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

[0010] The method for ensuring the quality of repairing engineering machinery tires comprises the following steps:

[0011] S1 defect marking: A metal ruler with several marks is fixed on the tire, followed by an X-ray inspection. The approximate location of the defect is inferred through the positional relationship between the metal ruler and the defect shown on the X-ray image. The metal ruler is then fixed to the area where the defect is inferred, and an X-ray inspection is performed again. The X-ray image shows that one of the marks on the metal ruler overlaps with the defect location, and it is marked with a marker. By marking the defect location with a metal ruler, the bubble location can be judged more accurately, avoiding product downgrade during the repair process due to inaccurate marking.

[0012] S2 determines the necessity of tire repair to quickly identify the necessity of repairing defective products, saves repair time and product repair costs, and improves repair efficiency and repair qualification rate: Use ultrasonic metal flaw detector to detect the defect position and the depth of the tire section, and compare the measurement results of the defect position and the tire section. If the defect position reaches the tire frame material area, no repair is performed and downgrade treatment is performed directly; if the defect position does not reach the tire frame material area, the next step is performed;

[0013] S3 Standardization of the shape of the tire repair area: The sidewall of the tire repair area is adjusted from an irregular shape to an arc shape, and then the area is polished and glued, and the depth of the area is measured by a tire tread depth gauge, and finally glue is filled and compacted; Adjusting the shape of the sidewall of the repair area to an arc shape can make the repair area have no dead angle in the depth direction, and avoid the problem of early failure caused by stress concentration in the repair area during the use of the repaired tire;

[0014] S4 Hot patching of tire repair area: Place a layer of heat insulation pad on the non-heat patching area of ​​the tire repair area, leaving the heat patching area exposed, and then use a heating plate or heating pad for hot patching; adding a heat insulation pad is conducive to accurate heating of the repair area, avoiding performance degradation caused by overheating of the non-repairing area;

[0015] S5 Spraying finishing liquid: After the hot repair is completed, grind and polish the repair area, and then spray the finishing liquid to complete the tire repair work.

[0016] Preferably, in step S1, the markers are metal sheets of different shapes arranged at equal intervals on a metal scale.

[0017] Preferably, in step S1, the metal ruler is fixed to the tire using adhesive tape.

[0018] Preferably, in step S1, if after X-ray detection, the X-ray image shows that the mark on the metal ruler does not overlap with the defect position, the metal ruler is moved again and X-ray detection is performed until the mark on the metal ruler overlaps with the defect position.

[0019] Preferably, in step S4, the thickness of the thermal insulation pad is 2-5 mm.

[0020] Preferably, in step S4, the edges of the holes on the thermal insulation pad that expose the hot repair area are chamfered at an angle of 35-60 degrees. During the repair process, the heating plate or heating pad is pressed against the repair area by air pressure. If the edges of the holes of the thermal insulation pad are not chamfered, there is a risk that the pressure at the edges of the holes of the thermal insulation pad is relatively low, and the repair area is not pressed firmly, resulting in bubbles or insufficient bonding strength.

[0021] Preferably, in step S4, the holes and the heat patching area on the thermal insulation pad are both circular, and the diameter ratio of the two is (150-180):1.

[0022] Preferably, in step S5, after the hot repair is completed, the heating plate or heating pad is removed and left for 0.5-8 hours. After the temperature of the repair area drops to room temperature, grinding and polishing are performed, and then the repair area is cleaned with 120# gasoline, and then the finishing liquid is sprayed. The gasoline can effectively clean the impurities in the modified area, improve the adhesion quality of the finishing liquid and the modified area, and ensure the quality of the modification.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The method of ensuring the repair quality of engineering machinery tires according to the present invention: (1) can accurately lock and confirm the defect position in the tire, avoiding the blindness and uncertainty in traditional methods; and the method of the present invention can accurately measure the depth of the defect, providing accurate data support for subsequent repair work. (2) Accurate repair ensures the quality of the tire after repair, and significantly improves the pass rate. (3) By standardizing the shape of the repair area, it is ensured that the repair of each repair area can meet better repair standards, which is conducive to ensuring the uniformity and stability of the repair, thereby improving the repair quality of the product. (4) Due to the improvement of the repair quality, the problem of tire degradation caused by improper repair is avoided, and the overall value of the product is guaranteed; and the accurate repair and standardized process effectively avoid the problem of early product failure and extend the service life of the tire. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the metal scale of the present invention.

[0026] Figure 2 Schematic diagram of an irregularly shaped rework area of ​​the present invention.

[0027] Figure 3 It is a schematic diagram of the repair area after the side wall of the present invention is adjusted to an arc shape.

[0028] In the figure, 1. Metal ruler; 101. Marking; 2. Rework area. DETAILED DESCRIPTION

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

[0030] Example 1

[0031] This embodiment provides a method for ensuring the quality of repair of engineering machinery tires, comprising the following steps:

[0032] S1 Defect marking: Use tape to mark a metal ruler 1 (such as Figure 1 The metal ruler 1 is fixed to the tire, wherein the marks 101 are metal sheets of different shapes (such as circle, ellipse, triangle, etc.) arranged at equal intervals on the metal ruler 1; then an X-ray inspection is performed, and the approximate position of the defect is inferred through the positional relationship between the metal ruler 1 and the defect displayed on the X-ray image; then the metal ruler 1 is fixed to the area where the defect is inferred, and an X-ray inspection is performed again, and the X-ray image shows that one of the marks 101 on the metal ruler 1 overlaps with the defect position, and is marked with a marker; if after the X-ray inspection, the X-ray image shows that the mark 101 on the metal ruler 1 does not overlap with the defect position, the metal ruler 1 is moved again and an X-ray inspection is performed until the mark 101 on the metal ruler 1 overlaps with the defect position.

[0033] S2 determines the necessity of tire repair: use an ultrasonic metal flaw detector to detect the defect location and the depth of the tire section, and compare the measurement results of the defect location and the tire section. If the defect location reaches the tire frame material area, no repair is performed and downgrading is performed directly; if the defect location does not reach the tire frame material area, the next step is performed.

[0034] S3 Standardize the shape of the tire repair area 2: Standardize the sidewall of the tire repair area 2 from an irregular shape (such as Figure 2 as shown) is adjusted to an arc shape (as shown Figure 3 Then use a grinding wheel to grind the area, apply glue, measure the depth of the area with a tire tread depth gauge, and finally fill and compact.

[0035] S4 Hot patching of tire repair area 2: A 5mm thick heat insulation pad is placed on the non-hot patching area of ​​tire repair area 2, and the edges of the holes on the heat insulation pad that are exposed to the hot patching area are chamfered at an angle of 50° to expose the hot patching area, and then hot patching is performed using a heating plate. The holes on the heat insulation pad and the hot patching area are both circular, and the diameter ratio of the two is 160:1.

[0036] S5 Spraying finishing liquid: After the hot repair is completed, remove the heating plate or heating pad and leave it for 8 hours. After the temperature of the repair area 2 drops to room temperature, grind and polish it, then use 120# gasoline to clean the repair area 2, and then spray the finishing liquid (Qingdao Dongrun Rubber and Plastic Co., Ltd., tire finishing liquid DR-RS720) to complete the tire repair work.

[0037] Comparative Example 1

[0038] The engineering machinery tire repair method of comparative example 1 comprises the following steps:

[0039] S1 defect marking: Use tape to fix the metal key on the tire, then perform X-ray inspection, and use a marker to mark the defect based on the positional relationship between the metal key and the defect shown on the X-ray image;

[0040] S2 Hot patching of tire repair area 2: directly use the heating plate to hot patch the tire repair area 2, and the area of ​​the heating area exceeds the area of ​​the repair area 2 by about 500%;

[0041] S3 spraying finishing liquid: after the hot repair is completed, the repair area 2 is polished, and then the finishing liquid (Qingdao Dongrun Rubber & Plastic Co., Ltd., tire finishing liquid DR-RS720) is sprayed on to complete the tire repair work.

[0042] The tires repaired in Example 1 and Comparative Example 1 were tested, and the test results are shown in Table 1-2:

[0043] Table 1 Test results of tires after repair in Example 1

[0044]

[0045] Table 2 Comparative Example 1 tire test results after repair

[0046]

[0047] It can be seen from Tables 1-2 that the method of the present invention can accurately lock and confirm the location and depth of the defect, improve the rework qualification rate and efficiency, and improve the rework quality of the product by standardizing the shape of the rework area 2, thereby avoiding tire degradation and early product failure caused by this.

Claims

1. A method for ensuring the quality of repairing engineering machinery tires, characterized in that: The following steps are involved: S1 defect marking: a metal ruler (1) with a plurality of marks (101) is fixed on the tire, and then an X-ray inspection is performed. The approximate position of the defect is inferred through the positional relationship between the metal ruler (1) and the defect displayed on the X-ray image; then the metal ruler (1) is fixed to the area where the defect is inferred, and an X-ray inspection is performed again. The X-ray image shows that one of the marks (101) on the metal ruler (1) overlaps with the defect position, and the defect is marked with a marker pen; S2: Determine the necessity of tire repair: Use an ultrasonic metal flaw detector to detect the defect location and the depth of the tire section, and compare the measurement results of the defect location and the tire section. If the defect location reaches the tire frame material area, no repair is performed and the tire is directly downgraded; If the defect location does not reach the tire frame material area, proceed to the next step; S3 Standardizing the shape of the tire repair area (2): adjusting the sidewall of the tire repair area (2) from an irregular shape to an arc shape, then grinding and brushing the area with glue, and then measuring the depth of the area with a tire tread depth measuring ruler, and finally filling and compacting the area with glue; S4 hot patching of the tire repair area (2): a layer of heat insulation pad is placed on the non-hot patching area of ​​the tire repair area (2), and the hot patching area is exposed, and then hot patching is performed using a heating plate or a heating pad; S5 spraying finishing liquid: after the hot repair is completed, the repair area (2) is ground and polished, and then sprayed with finishing liquid, thus completing the tire repair work.

2. The method for ensuring the quality of repairing engineering machinery tires according to claim 1, characterized in that: In step S1, metal sheets of different shapes are marked and arranged at equal intervals on a metal scale (1).

3. The method for ensuring the quality of repairing engineering machinery tires according to claim 1, characterized in that: In step S1, a metal scale (1) is fixed to the tire using adhesive tape.

4. The method for ensuring the quality of repairing engineering machinery tires according to claim 1, characterized in that: In step S1, if after X-ray detection, the X-ray image shows that the mark (101) on the metal scale (1) does not overlap with the defect position, the metal scale (1) is moved again and X-ray detection is performed until the mark (101) on the metal scale (1) overlaps with the defect position.

5. The method for ensuring the quality of repairing engineering machinery tires according to claim 1, characterized in that: In step S4, the thickness of the thermal insulation pad is 2-5 mm.

6. The method for ensuring the quality of repairing engineering machinery tires according to claim 1, characterized in that: In step S4, the edges of the holes on the thermal insulation pad that expose the heat patching area are chamfered at an angle of 35-60°.

7. The method for ensuring the quality of repairing engineering machinery tires according to claim 1, characterized in that: In step S4, the holes and the heat patching area on the thermal insulation pad are both circular, and the diameter ratio of the two is (150-180):

1.

8. The method for ensuring the quality of repairing engineering machinery tires according to claim 1, characterized in that: In step S5, after the hot repair is completed, the heating plate or heating pad is removed and left for 0.5-8 hours. After the temperature of the repair area (2) drops to room temperature, grinding and polishing are performed, and then the repair area (2) is cleaned with 120# gasoline, and then the finishing liquid is sprayed on it.

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