Production method for ensuring quality of carcass joint of radial tire

Abstract

The invention discloses a production method for ensuring the quality of a radial tire carcass joint, and relates to the technical field of tires. According to the technical scheme, the method comprises the following steps: (1) in a carcass ply calendering process, reserving a rubber edge at the edge part of the carcass ply, and then curling; (2) a light curtain sensor is mounted above a conveying belt at the feeding end of the cutting machine and matched with a feeding trolley, and it is guaranteed that the carcass ply is located in the middle of the conveying belt; (3) a primary trimming device and a secondary trimming device are arranged between the cutting machine and the light curtain sensor and located on the two sides of the carcass ply correspondingly, and automatic trimming of rubber edges is achieved; (4) heat lamps are arranged between a cutting knife of the cutting machine and the primary and secondary trimming device and located on the two sides of the tire body cord fabric respectively; and (5) a camera is mounted above the conveying belt at the discharging end of the splicer behind the cutting machine. The tire body joint quality can be improved, the waste and defective rate of poor tire body joints is reduced, the tire waste and defective rate caused by poor tire body joints is reduced, and the problems of product failure and customer complaint caused by poor tire body joints are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of tires, and in particular to a production method for ensuring the quality of radial tire carcass joints. Background Art

[0002] In the current production process of engineering tires, the manufacturing link of the carcass joint is particularly critical. However, due to the influence of various factors, this link often encounters some technical and management problems, among which the most prominent one is the phenomenon that the arrangement of the carcass joint steel wire does not meet the requirements.

[0003] There are several reasons for the above problems:

[0004] 1) Insufficient adhesion of the carcass joint: During the tire manufacturing process, the adhesion of the carcass joint directly affects the fixation and arrangement of the steel wire. If the adhesion is insufficient, it is difficult for the steel wire to be closely arranged as required by the design, resulting in irregular arrangement.

[0005] 2) Inadequate inspection: Quality inspection is an important step to ensure product quality. However, in actual production, due to reasons such as inspection frequency, methods or equipment, some unqualified carcass joints are not detected in time and flow into the next process.

[0006] The above problems in the carcass joint will cause the following adverse effects:

[0007] 1) Increased manufacturing costs: Since tires with carcass joint wire arrangement that does not meet the requirements cannot be sold as qualified products, they need to be downgraded, which undoubtedly increases the company's manufacturing costs. In addition, in order to solve this problem, companies may need to invest more resources in technical improvements and quality management.

[0008] 2) Product performance risk: For those products with critical wire arrangement, although they have temporarily passed the quality inspection, in actual use, the carcass joints are often subjected to greater stress. Due to the irregular arrangement, these parts are prone to early failure, such as wire breakage, joint detachment, etc.

[0009] 3) Customer complaints: Once a tire fails during use, it will not only cause inconvenience and loss to the user, but may also trigger a series of customer complaints. This not only damages the company's reputation, but may also affect the company's market competitiveness.

[0010] In summary, the carcass joint problem in the production of engineering tires cannot be ignored. We should start from multiple levels such as technology and management to strengthen quality control to ensure that each batch of products can meet the design requirements, thereby reducing costs, improving performance, reducing customer complaints, and achieving sustainable development of the enterprise. Summary of the invention

[0011] The technical problem to be solved by the present invention is: to overcome the shortcomings of the prior art and provide a production method for ensuring the quality of the radial tire carcass joint, which can improve the carcass joint quality and reduce the scrap rate of defective products due to poor carcass joints, reduce the scrap rate of tires caused by poor carcass joints, and avoid product failure and customer complaints caused by poor carcass joints.

[0012] The technical solution of the present invention is:

[0013] Production methods to ensure the quality of radial tire carcass joints:

[0014] 1) During the calendering process of the carcass cord, a rubber edge is reserved at the edge of the carcass cord and then curled; the rubber edge reserved at the edge of the carcass cord can reduce the problem of decreased self-sulfurization viscosity of the rubber at the subsequent carcass joint due to the long storage period of the cord, and improve the stability and compliance of the carcass joint quality;

[0015] 2) A light curtain sensor is installed above the conveyor belt at the feeding end of the cutting machine to monitor whether the carcass cord is in the middle of the conveyor belt. When it is detected that the carcass cord is not in the middle of the conveyor belt, the control system controls the feeding trolley of the cutting machine to move, thereby adjusting the carcass cord to the middle of the conveyor belt; automatic and timely deviation correction is achieved during the feeding process of the carcass cord, effectively ensuring that the cord is fed in alignment, and the reserved rubber edge will not be folded during the feeding process, thereby ensuring the quality of subsequent trimming and improving the quality of the carcass joint;

[0016] 3) A mother-and-child trimming device is provided between the first and second conveyor belts of the cutting machine and on both sides of the carcass cord. The mother-and-child trimming device includes a front rotating rod and a rear rotating rod. A cutting knife is provided on the front rotating rod in the circumferential direction, and a knife groove is provided on the rear rotating rod in the circumferential direction. The cutting knife is inserted into the knife groove, and the rubber edges on both sides of the carcass cord extend vertically between the cutting knife and the knife groove. During the feeding process of the carcass cord, the front rotating rod and the rear rotating rod rotate in the same direction and use the bite between the cutting knife and the knife groove to automatically trim the reserved rubber edge. The adhesiveness of the rubber in the area after the rubber edge is trimmed is better than that in the area before the trimming, and the shape and size of the trimmed rubber are more stable, which is conducive to improving and ensuring the stability and compliance of the carcass cord joint quality.

[0017] 4) Heat lamps are provided between the cutting knife of the cutting machine and the trimming device and on both sides of the carcass cord. After the carcass cord is heated by the heat lamp, the temperature of the cord edge is increased from 20°C to 35-50°C. At this time, the rubber material on the cord edge becomes relatively soft. Under the same joint pressure and joint speed of the joint machine, the carcass joint is more compact.

[0018] 5) A camera is installed above the conveyor belt at the discharging end of the splicing machine behind the cutting machine.

[0019] Preferably, in step 1), the width of the glue edge is 15-30 mm.

[0020] Preferably, in step 1), before curling, a layer of plastic mat is laid on the carcass cord, and the plastic mat covers the entire carcass cord and the edge rubber edge, and the plastic mat exceeds the rubber edge by 30-50 mm.

[0021] Preferably, in step 3), the height A of the cutting knife and the depth B of the knife groove satisfy AB=3-10 mm.

[0022] Preferably, in step 4), the length of the baking lamp is 0.5-1 m.

[0023] Preferably, in step 4), the heating lamp heats both sides of the carcass cord to 35-50°C.

[0024] Preferably, in step 5), a picture of the carcass cord with an abnormal joint problem is uploaded to the control system, and the control system compares the picture of the carcass cord after the joint taken by the camera with the picture. If the photo shows the abnormal joint problem shown in the picture, the position of the abnormal carcass joint is recorded and an alarm is issued.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The production method of the present invention improves the quality of carcass joints from the aspects of calender carcass cord rubber edge reservation design, cutting machine automatic deviation correction design, automatic trimming design, cord edge heating and joint quality monitoring design, and reduces the scrap rate of carcass joints and the resulting scrap rate of tires, thereby avoiding product failure and customer complaints caused by poor carcass joints. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the mother-and-child trimming device of the present invention.

[0028] In the figure, 1, front rotating stick; 101, cutting knife; 2, rear rotating stick; 201, knife groove. 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 production method for ensuring the quality of radial tire carcass joints:

[0032] 1) During the calendering process of the carcass cord, a 20mm wide rubber edge is reserved at the edge of the carcass cord, and then curled. Before curling, a layer of plastic mat is laid on the carcass cord, and during the curling process, ensure that the plastic mat completely covers the carcass cord and the rubber edge and the plastic mat exceeds the rubber edge by 40mm to avoid the problem of interlayer adhesion of the reserved rubber edge.

[0033] 2) A light curtain sensor is installed above the conveyor belt at the feeding end of the cutting machine (90° carcass cutting machine, Tianjin Saixiang Technology Co., Ltd.) to monitor whether the carcass cord is in the middle of the conveyor belt. When it detects that the carcass cord is not in the middle of the conveyor belt, the control system controls the feeding trolley of the cutting machine to move, thereby adjusting the carcass cord to the middle of the conveyor belt. In this way, automatic and timely deviation correction can be achieved during the feeding process of the carcass cord, effectively ensuring that the cord is fed in alignment, and the reserved rubber edge will not be folded during the feeding process, ensuring the quality of subsequent trimming while improving the quality of the carcass joint.

[0034] 3) Between the first and second conveyor belts of the cutting machine and on both sides of the carcass cord, a parent-child trimming device is provided, such as Figure 1 As shown, the mother-and-child trimming device includes a front rotating roller 1 and a rear rotating roller 2. A cutter 101 is provided circumferentially on the front rotating roller 1, and a knife groove 201 is provided correspondingly on the rear rotating roller 2 in the circumferential direction, and the height A of the cutter 101 and the depth B of the knife groove 201 satisfy AB=5mm; the cutter 101 is inserted into the knife groove 201, and the rubber edges on both sides of the carcass cord extend vertically between the cutter 101 and the knife groove 201. The carcass cord is fed and conveyed to the cutting machine through a first conveyor belt and a second conveyor belt in turn, and the first conveyor belt is higher than the second conveyor belt, so that the carcass cord is in a vertical conveying state between the first conveyor belt and the second conveyor belt. The mother-and-child trimming device is set here, and the front rotating roller 1 and the rear rotating roller 2 can use the bite between the cutter 101 and the knife groove 201 during the feeding process of the carcass cord to complete the automatic trimming of the reserved rubber edge during the same direction rotation process. Moreover, the adhesiveness of the rubber in the area after the rubber edge is trimmed is better than that in the area before the trimming, and the shape and size of the trimmed rubber are more stable, which is beneficial to improving and ensuring the stability and compliance of the quality of the carcass cord joint.

[0035] 4) A 1m long heating lamp is installed between the cutting knife of the cutting machine and the trimming device and on both sides of the carcass cord. When the carcass cord is fed forward, the heating lamp starts to work and heats the edge of the carcass cord, raising its temperature from 20℃ to 35-50℃. At this time, the rubber on the edge of the cord becomes relatively soft. Under the same joint pressure and speed of the jointing machine, the carcass joint is more compact.

[0036] 5) A camera is installed above the conveyor belt at the discharging end of the jointing machine behind the cutting machine. Multiple cameras can be set, or they can be set on a moving guide rail to move and take pictures of the carcass cord after the joint. The carcass width is generally 1000-4500mm. The camera can be used to cover and confirm the joint quality of the entire carcass. The carcass cord picture with abnormal joint problems is uploaded to the control system, the carcass joint is moved out of the conveyor belt position behind the jointing machine, and the camera takes pictures of the joint part. The control system compares the photo taken by the camera with the picture. If the photo shows the abnormal joint problem shown in the picture, the abnormal position of the carcass joint is recorded and an alarm is issued.

[0037] Comparative Example 1

[0038] Production method of radial tire carcass joint:

[0039] 1) During the calendering process of the carcass cord, the rubber edge of the carcass cord is trimmed off;

[0040] Steps 2)-5) are not performed.

[0041] The carcass joint quality of Example 1 and Comparative Example 1 was tested, and the test results are shown in Table 1:

[0042] Table 1 Carcass quality test results of Example 1 and Comparative Example 1

[0043]

[0044]

[0045] As can be seen from Table 1, the production method of the present invention improves the quality of the carcass joint from the aspects of the calendered carcass cord rubber edge reservation design, the cutting machine automatic correction design, the automatic trimming design, the cord edge heating and the joint quality monitoring design, and reduces the scrap rate of the carcass joint, reduces the scrap rate of the tire caused by the poor carcass joint, and avoids product failure and customer complaints caused by the poor carcass joint.

Claims

1. A production method for ensuring the quality of radial tire carcass joints, characterized in that: 1) During the calendering process of the carcass cord, a rubber edge is reserved at the edge of the carcass cord and then curled; 2) A light curtain sensor is installed above a section of the conveyor belt at the feeding end of the cutting machine to monitor whether the carcass cord is in the middle of a section of the conveyor belt. When it is detected that the carcass cord is not in the middle of a section of the conveyor belt, the control system controls the feed trolley of the cutting machine to move, thereby adjusting the carcass cord to the middle of a section of the conveyor belt; 3) A parent-child trimming device is provided between the first and second conveyor belts of the cutting machine and on both sides of the carcass cord. The parent-child trimming device comprises a front rotating roller (1) and a rear rotating roller (2). A cutting knife (101) is provided circumferentially on the front rotating roller (1), and a knife groove (201) is provided correspondingly on the rear rotating roller (2). The cutting knife (101) is inserted into the knife groove (201), and the rubber edges on both sides of the carcass cord extend vertically between the cutting knife (101) and the knife groove (201); 4) A baking lamp is provided between the cutting knife of the cutting machine and the trimming device and on both sides of the carcass cord; 5) A camera is installed above the conveyor belt at the discharging end of the splicing machine behind the cutting machine.

2. The method for ensuring the quality of radial tire carcass joints according to claim 1, characterized in that: In step 1), the width of the glue edge is 15-30 mm.

3. The method for ensuring the quality of radial tire carcass joints according to claim 1, characterized in that: In step 1), before curling, a layer of plastic mat is laid on the carcass cord, and the plastic mat covers the entire carcass cord and the edge rubber edge, and the plastic mat exceeds the rubber edge by 30-50 mm.

4. The method for ensuring the quality of radial tire carcass joints according to claim 1, characterized in that: In step 3), the height A of the cutting knife (101) and the depth B of the knife groove (201) satisfy AB=3-10 mm.

5. The method for ensuring the quality of radial tire carcass joints according to claim 1, characterized in that: In step 4), the length of the baking lamp is 0.5-1m.

6. The method for ensuring the quality of radial tire carcass joints according to claim 1, characterized in that: In step 4), the carcass cord is heated to 35-50°C on both sides by a heating lamp.

7. The method for ensuring the quality of radial tire carcass joints according to claim 1, characterized in that: In step 5), a carcass cord picture with an abnormal joint problem is uploaded to the control system, and the control system compares the carcass joint photo taken by the camera with the picture. If the photo shows an abnormal joint problem, the position of the abnormal carcass joint is recorded and an alarm is issued.

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