Tire forming inner liner jointing method and tire thereof

Abstract

The invention relates to a tire forming airtight layer jointing method and a tire thereof, and belongs to the field of tires. Opening the first-section forming drum, and conveying the cut airtight layer to the first-section forming drum; the end of the airtight layer is tightly attached to and mutually lapped with the smooth surface of one section of the forming drum; carrying out radial condensation on the first section of forming drum; the two ends of the airtight layer are conveyed to the middle of an opened clamping mechanism from a section of forming drum face, the end of the airtight layer is exposed by a specified length, the clamping mechanism is closed, and certain pressure is applied in the vertical direction; closing the clamping mechanism in the horizontal direction; after the temperature of a cutting knife electrically heated by a cutting mechanism of the joint equipment reaches a set temperature, the cutting knife is quickly pushed along a clamping mechanism to cut off the exposed ends of the airtight layer, so that fresh sections are formed at the two ends of the airtight layer; and after the cutter is reset, the clamping mechanism starts to move relatively, butt joint of the ends of the airtight layers is carried out, certain pressure and time are kept, the clamping mechanism is opened, the jointing equipment is moved out of the airtight layer cylinder to reset, and the jointing process of the airtight layers is completed.

Description

Technical Field

[0001] The invention relates to the field of tire manufacturing, in particular to a tire molding airtight layer joint method and a tire thereof, and is particularly suitable for an aviation tire molding airtight layer joint using nylon cord as a skeleton material. Background Art

[0002] As we all know, the airtight layer is an important component of the tubeless pneumatic tire. It is located in the innermost layer of the tire and is composed of a rubber composition with good airtightness. Its main function is to seal the gas filled into the tire to prevent the tire pressure from dropping. Air pressure is a key factor affecting tire performance. At the rated inflation pressure, the comprehensive performance of the tire, such as load-bearing capacity, high-speed performance, durability, and wear resistance, is in the best state. When the tire is deflated, it will cause the tire to deform more, the load-bearing capacity to decrease, the rolling resistance and heat generation to increase, and eventually the tire will delaminate and explode, causing serious damage to traffic safety. For the civil aviation industry, which requires safety first, it is particularly important to eliminate the risk of aviation tire explosion caused by lack of air. Through the analysis of tire defects, the cracking of the joint of the airtight layer is the main reason for the drop in the air pressure of the finished tire. The fundamental reason for the joint opening is the cracking of the airtight layer joint during the tire blank molding process.

[0003] Traditional tire molding airtight layer joints mainly use manual lap joint technology, which is greatly affected by the skills and experience of workers, and the joint quality is unreliable. Since the airtight layer rubber is mainly halogenated butyl material, the raw rubber strength is low and the self-adhesion is poor. Traditionally, adhesive film is attached to the outside or inside and outside of the airtight layer lap to strengthen the firmness of the joint. However, when the tire blank is formed, internal cracks often occur in the joint. This phenomenon is not easy to be found during the molding process. After vulcanization, the finished product is prone to heavy skin, lack of glue and other quality problems at the airtight layer joint, affecting the tire's qualified rate. At the same time, if the airtight layer overlap is too large during the tire molding process, too much rubber will cause the local density of the cord at the joint to become thinner, reduce the load-bearing capacity of the tire, and increase the safety hazards of the tire. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, the present invention provides a tire molding airtight layer joint method and a tire thereof, which can better solve the quality hidden dangers caused by the traditional airtight layer joint process.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a tire forming airtight layer joint method and tire thereof, characterized in that the method comprises the following steps: 1) the airtight layer is transmitted to the airtight layer feeding rack through a guide device, and is cut into a specified length by a cutting knife of the feeding rack; 2) a section of the forming drum is opened, and the conveyor belt of the feeding rack is started to convey the determined airtight layer to a section of the forming drum; 3) the end of the airtight layer is tightly attached to the smooth surface of a section of the forming drum and overlapped with each other, and the overlap position is located at the upper end of a section of the forming drum; 4) a section of the forming drum is radially shrunk; 5) the airtight layer joint device is moved to the upper part of a section of the forming drum, and the airtight layer joint device is moved from a section of the forming drum to the upper part of the forming drum. On the forming drum surface, the two ends of the air-tight layer are respectively delivered to the middle of the opened clamping mechanism, the end of the air-tight layer is exposed to a specified length, the clamping mechanism is closed, and a certain pressure is applied in the vertical direction; 6) The clamping mechanism is closed in the horizontal direction; 7) After the temperature of the electrically heated cutter of the cutting mechanism of the joint equipment reaches the set temperature, it is quickly advanced along the clamping mechanism to cut off the exposed end of the air-tight layer, so that fresh cross-sections are formed at both ends of the air-tight layer; 8) After the cutter is reset, the clamping mechanism starts relative movement to dock the ends of the air-tight layer, maintaining a certain pressure and time, the clamping mechanism is opened, and the joint equipment is moved out of the air-tight layer cylinder and reset to complete the air-tight layer joint process.

[0006] The clamping mechanism comprises upper and lower clamping plates on the joint device and a lower clamping plate on the joint device, and elastic bodies are installed at the ends of the clamping plates on the joint device and the lower clamping plates on the joint device.

[0007] The upper clamping plate of the joint device and the lower clamping plate of the joint device of the clamping mechanism are driven by an oil cylinder or a gas cylinder to close vertically to clamp the end of the middle airtight layer, and the clamping force is 0.5-100KN.

[0008] The clamping mechanism is driven by an oil cylinder or a gas cylinder to achieve docking, maintaining a certain pressure and docking time, the docking pressure is 50-100KN, and the docking time is 5-30sec.

[0009] The cutting mechanism contains an electrically heated cutter with a heating temperature of 100-500°C. The cutter can slide along the clamping mechanism to cut the end of the airtight layer under the push of an oil cylinder or an air cylinder.

[0010] A tire produced using the aforementioned method.

[0011] The beneficial effects of the present invention are that hot-melt butt jointing of the airtight layer can be achieved with high butt jointing precision, strong bonding strength, firm and uniform joints of the airtight layer, and no cracking at the joints of the airtight layers of the formed tire blank and the finished tire. The present invention is particularly suitable for the production of aviation tires with extremely high requirements on the manufacturing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0013] Figure 1It is a diagram showing the state of the airtight layer clamping device and the cutting state of the airtight layer butt surface.

[0014] Figure 2 It is a joint state diagram of the airtight layer joint device of the present invention.

[0015] In the figure, 1. the upper clamping plate of the joint device, 2. the lower clamping plate of the joint device, 3. a section of the forming drum after shrinkage, 4. the airtight layer, 5. the elastomer, and 6. the cutting knife. DETAILED DESCRIPTION

[0016] Embodiment 1: The present invention comprises the following steps: 1) the airtight layer 4 is transferred to the airtight layer feeding rack through the guide device, and is cut into a specified length by the feeding rack cutter; 2) a section of the forming drum is opened, the feeding rack conveyor belt is started, and the determined airtight layer is transported to a section of the forming drum; 3) the end of the airtight layer 4 is tightly attached to the smooth surface of a section of the forming drum and overlapped with each other, and the overlap position is located at the upper end of a section of the forming drum; 4) a section of the forming drum is radially shrunk (see a section of the forming drum 3 after shrinkage in the figure); 5) the airtight layer joint device is moved to the upper part of a section of the forming drum, and the two ends of the airtight layer 4 are respectively delivered to the middle of the opened clamping mechanism from the surface of a section of the forming drum, the end of the airtight layer is exposed to a specified length, the clamping mechanism is closed, and a certain pressure is applied in the vertical direction, the clamping mechanism comprises an upper clamping plate 1 of the upper joint device and a lower clamping plate 2 of the joint device, the upper clamping plate 1 of the joint device and the lower clamping plate 2 of the joint device An elastomer 5 is installed at the end of the holding plate 2. The upper clamping plate 1 of the joint device of the clamping mechanism and the lower clamping plate 2 of the joint device are driven by an oil cylinder or an air cylinder to close vertically to clamp the end of the middle airtight layer 4, and the clamping force is 10KN; 6) The clamping mechanism is closed in the horizontal direction; 7) The cutting mechanism of the joint device contains an electrically heated cutter 6, and the heating temperature of the electrically heated cutter 6 is 200°C. After the temperature reaches the set temperature, the cutter 6 slides and advances rapidly along the clamping mechanism to cut off the exposed end of the airtight layer, so that fresh sections are formed at both ends of the airtight layer 4; 8) After the cutter 6 is reset, the clamping mechanism starts relative movement to dock the ends of the airtight layers, maintaining a certain pressure and time. The clamping mechanism is driven by an oil cylinder or an air cylinder to achieve docking. The docking pressure is 70KN, the docking time is 12sec, the clamping mechanism is opened, the joint device is moved out of the airtight layer tube and reset, and the airtight layer joint process is completed.

[0017] A tire produced using the aforementioned method.

[0018] Embodiment 2: The present invention comprises the following steps: 1) the airtight layer 4 is transferred to the airtight layer feeding rack through the guide device, and is cut into a specified length by the feeding rack cutter; 2) a section of the forming drum is opened, the feeding rack conveyor belt is started, and the determined airtight layer is transported to a section of the forming drum; 3) the end of the airtight layer 4 is tightly attached to the smooth surface of a section of the forming drum and overlapped with each other, and the overlap position is located at the upper end of a section of the forming drum; 4) a section of the forming drum is radially shrunk (see a section of the forming drum 3 after shrinkage in the figure); 5) the airtight layer joint device is moved to the upper part of a section of the forming drum, and the two ends of the airtight layer 4 are respectively delivered to the middle of the opened clamping mechanism from the surface of a section of the forming drum, the end of the airtight layer is exposed to a specified length, the clamping mechanism is closed, and a certain pressure is applied in the vertical direction, the clamping mechanism comprises an upper clamping plate 1 of the upper joint device and a lower clamping plate 2 of the joint device, the upper clamping plate 1 of the joint device and the lower clamping plate 2 of the joint device An elastomer 5 is installed at the end of the holding plate 2. The upper clamping plate 1 of the joint device of the clamping mechanism and the lower clamping plate 2 of the joint device are driven by an oil cylinder or an air cylinder to close vertically to clamp the end of the middle airtight layer 4, and the clamping force is 0.5KN; 6) The clamping mechanism is closed in the horizontal direction; 7) The cutting mechanism of the joint device contains an electrically heated cutter 6, and the heating temperature of the electrically heated cutter 6 is 500°C. After the temperature reaches the set temperature, the cutter 6 slides and advances rapidly along the clamping mechanism to cut off the exposed end of the airtight layer, so that fresh sections are formed at both ends of the airtight layer 4; 8) After the cutter 6 is reset, the clamping mechanism starts relative movement to dock the ends of the airtight layers, maintaining a certain pressure and time. The clamping mechanism is driven by an oil cylinder or an air cylinder to achieve docking. The docking pressure is 100KN, the docking time is 5sec, the clamping mechanism is opened, the joint device is moved out of the airtight layer tube and reset, and the airtight layer joint process is completed.

[0019] A tire produced using the aforementioned method.

[0020] Embodiment three: The present invention comprises the following steps: 1) the airtight layer 4 is transferred to the airtight layer feeding rack through the guide device, and is cut into a specified length by the feeding rack cutter; 2) a section of the forming drum is opened, the feeding rack conveyor belt is started, and the determined airtight layer is transported to a section of the forming drum; 3) the end of the airtight layer 4 is tightly attached to the smooth surface of a section of the forming drum and overlapped with each other, and the overlap position is located at the upper end of a section of the forming drum; 4) a section of the forming drum is radially shrunk (see a section of the forming drum 3 after shrinkage in the figure); 5) the airtight layer joint device is moved to the upper part of a section of the forming drum, and the two ends of the airtight layer 4 are respectively delivered to the middle of the opened clamping mechanism from the surface of a section of the forming drum, the end of the airtight layer is exposed to a specified length, the clamping mechanism is closed, and a certain pressure is applied in the vertical direction, the clamping mechanism comprises an upper clamping plate 1 of the upper joint device and a lower clamping plate 2 of the joint device, the upper clamping plate 1 of the joint device and the lower clamping plate 2 of the joint device An elastomer 5 is installed at the end of the holding plate 2. The upper clamping plate 1 of the joint device of the clamping mechanism and the lower clamping plate 2 of the joint device are driven by an oil cylinder or an air cylinder to close vertically to clamp the end of the middle airtight layer 4, and the clamping force is 100KN; 6) The clamping mechanism is closed in the horizontal direction; 7) The cutting mechanism of the joint device contains an electrically heated cutter 6, and the heating temperature of the electrically heated cutter 6 is 100°C. After the temperature reaches the set temperature, the cutter 6 slides and advances rapidly along the clamping mechanism to cut off the exposed end of the airtight layer, so that fresh sections are formed at both ends of the airtight layer 4; 8) After the cutter 6 is reset, the clamping mechanism starts relative movement to dock the ends of the airtight layers, maintaining a certain pressure and time. The clamping mechanism is driven by an oil cylinder or an air cylinder to achieve docking, the docking pressure is 50KN, the docking time is 30sec, the clamping mechanism is opened, the joint device is moved out of the airtight layer tube and reset, and the airtight layer joint process is completed.

[0021] A tire produced using the aforementioned method.

Claims

1. A tire molding airtight layer joint method, characterized in that: The process includes the following steps: 1) the airtight layer is transferred to the airtight layer feeding rack through the guide device, and is cut into a specified length by the feeding rack cutter; 2) a section of the forming drum is opened, the feeding rack conveyor belt is started, and the determined airtight layer is transferred to a section of the forming drum; 3) the end of the airtight layer is pressed against the smooth surface of a section of the forming drum and overlapped with each other, and the overlap position is at the upper end of a section of the forming drum; 4) a section of the forming drum is radially condensed; 5) the airtight layer joint device is moved to the upper part of a section of the forming drum, and the two ends of the airtight layer are respectively delivered to the opened clamping machine from the surface of a section of the forming drum. 6) The clamping mechanism is closed in the horizontal direction; 7) After the temperature of the electrically heated cutter of the cutting mechanism of the joint equipment reaches the set temperature, it is quickly advanced along the clamping mechanism to cut off the exposed end of the airtight layer, so that fresh cross-sections are formed at both ends of the airtight layer; 8) After the cutter is reset, the clamping mechanism starts relative movement to dock the ends of the airtight layers, maintaining a certain pressure and time, the clamping mechanism opens, and the joint equipment is moved out of the airtight layer tube and reset to complete the airtight layer joint process.

2. The tire molding airtight layer joint method according to claim 1, characterized in that The clamping mechanism comprises upper and lower clamping plates on the joint device and a lower clamping plate on the joint device, and elastic bodies are installed at the ends of the clamping plates on the joint device and the lower clamping plates on the joint device.

3. The tire molding airtight layer joint method according to claim 1, characterized in that The upper clamping plate of the joint device and the lower clamping plate of the joint device of the clamping mechanism are driven by an oil cylinder or a gas cylinder to close vertically to clamp the end of the middle airtight layer, and the clamping force is 0.5-100KN.

4. The tire molding airtight layer joint method according to claim 1, characterized in that The clamping mechanism is driven by an oil cylinder or a gas cylinder to achieve docking, maintaining a certain pressure and docking time, the docking pressure is 50-100KN, and the docking time is 5-30sec.

5. The tire molding airtight layer joint method according to claim 1, characterized in that The cutting mechanism contains an electrically heated cutter with a heating temperature of 100-500°C. The cutter can slide along the clamping mechanism to cut the end of the airtight layer under the push of an oil cylinder or an air cylinder.

6. A tire produced using the method of claims 1 to 5.

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