A method for butting the head and tail of a strip-shaped sound-absorbing cotton material on the inner wall of a tire

Abstract

The present invention provides a method for docking a material head and a material tail of a strip-shaped sound-absorbing cotton on an inner wall of a tire. The selected length of the sound-absorbing cotton is greater than the inner circumference length of the tire by more than 10 mm. The sound-absorbing cotton is then attached to the sticky rubber material on the inner wall of the tire, and the first material tail of the excess sound-absorbing cotton is overlapped above the material head. Then, part of the first material tail is cut off according to actual needs to form a second material tail. Through a predetermined error correction sound-absorbing cotton margin of more than 10 mm, the material head and the second material tail are accurately docked according to process requirements. Then, the second material tail is pressed onto the sticky rubber material through a first pressing device to ensure that the spacing between the second material tail and the material head will not change due to tire manufacturing errors. At the same time, the method can adapt to the combination of sound-absorbing cotton of different materials and rubber materials of different viscosities, and has good versatility.

Description

Technical Field

[0001] The present invention relates to a manufacturing process for silent tires used in new energy vehicles such as electric vehicles, and more particularly to a method for accurately docking the head and tail of strip-shaped sound-absorbing cotton on the inner wall of the silent tire. Background Art

[0002] With the determination of my country's dual carbon goals of "carbon peak and carbon neutrality", it is predicted that traditional fuel passenger cars will gradually withdraw from the market, while the market share of new energy vehicles, led by electric vehicles, is increasing year by year. New energy vehicles have no engines and the car itself has low noise, while traditional tires can no longer meet the demand of new energy vehicles for a quiet environment due to their high tire noise. In recent years, domestic and foreign tire manufacturers have been committed to the research and development of silent tires, and some car companies have equipped new energy vehicles with silent tires. However, when manufacturing tires, how to make silent materials that reduce tire noise, such as sound-absorbing cotton, inside the tire is an unavoidable problem.

[0003] The sound-absorbing cotton laminating process disclosed in the Chinese patent document CN107107501A published by Xibo Automation Company on August 29, 2017 is: first center and fix the tire, then apply glue to the inner wall of the tire, and then drive the anti-noise strip at a linear drive speed greater than the rotation speed of the tire to compress the strip, so that the length of the strip becomes less than the nominal length of the strip, thereby forming a gap between the two ends of the strip, so that after relaxation, the strip scrapes the adhesive device and re-places the adhesive device on the end, thereby causing the end to be fixed head and tail. However, this kind of sound-absorbing cotton laminating process has the following shortcomings:

[0004] 1. If the adhesive used to bond the anti-noise strip (i.e. the strip-shaped sound-absorbing cotton) is too sticky or the sound-absorbing cotton is too soft, that is, the internal stress of the sound-absorbing cotton is insufficient to overcome the resistance of the adhesive or the sound-absorbing cotton is too soft to overcome the resistance of the adhesive. Therefore, the sound-absorbing cotton bonding process has strict requirements on the selection and matching of the sound-absorbing cotton and the adhesive, and its applicability is limited;

[0005] 2. As attached Figure 1 and 2 As shown in the figure, during tire manufacturing, even if the tires are of the same batch and specification, there is a certain error between the inner circumference lengths T1 and T2. For example, the inner circumference length of a 17-inch car tire is 2000 mm, while the inner circumference length of another tire of the same batch and specification is 2010 mm. Therefore, when using this type of sound-absorbing cotton laminating process, there is a situation where the length X of the sound-absorbing cotton is greater than or less than the inner circumference length of the tire, resulting in a large distance between the head X1 and the tail X2 of the sound-absorbing cotton (see the attached figure). Figure 1 ) or partially overlap (see Appendix Figure 2), so it is impossible to achieve the ideal fitting effect.

[0006] In summary, how to apply strip-shaped sound-absorbing cotton to the inner wall of a tire and accurately connect the head and tail of the material has become a technical problem that technical personnel in the industry need to overcome. Summary of the invention

[0007] In order to solve the above technical problems, the present invention provides a method for docking the head and tail of a strip-shaped sound-absorbing cotton on the inner wall of a tire, wherein the length of the sound-absorbing cotton is greater than the inner circumference of the tire, and the docking method comprises: providing a tire, wherein a layer of sticky rubber is coated on the inner wall of the tire; providing a bonding component, wherein the bonding component bonds the sound-absorbing cotton to the sticky rubber on the inner wall of the tire from the head of the sound-absorbing cotton as the starting end, and overlaps the first tail of the sound-absorbing cotton with the head of the sound-absorbing cotton; providing a cutting device, wherein the first tail of the sound-absorbing cotton that exceeds the inner circumference is cut off by the cutting device; and providing a first pressing device, wherein the second tail of the sound-absorbing cotton that is connected to the head after being cut off is pressed onto the sticky rubber on the inner wall of the tire by the first pressing device.

[0008] Preferably, a first detection device is provided, and before the first material tail cutting process, the cutting angle of the cutting device is determined by the first detection device.

[0009] Preferably, the cutting angle is that the cutting device and the sound-absorbing cotton overlap and cut vertically at the first material tail above the material head.

[0010] Preferably, a spacing of -5 mm to 20 mm is reserved between the second tail and the head of the sound-absorbing cotton after cutting.

[0011] Preferably, a second detection device is provided. After the second material tail lamination process, the second detection device is used to detect whether the distance between the second material tail and the material head meets the process requirements. If it does not meet the requirements, an alarm is issued to wait for processing or the tire is directly transferred to the waiting area.

[0012] Preferably, a material taking device is provided. Before the first material tail is cut, the first material tail is first grabbed and fixed by the material taking device, and after cutting, the first material tail is moved out of the inner wall of the tire by the material taking device.

[0013] Preferably, the length of the sound-absorbing cotton is at least 10 mm greater than the inner circumference of the tire.

[0014] Preferably, a second pressing device is provided for applying pressure to the end surface of the second material tail and compressing the second material tail to move it to the outside of the end surface of the material head.

[0015] Preferably, an L-shaped component matching the end surface of the second material tail of the sound-absorbing cotton is provided on the second pressing device, and pressure is applied to the end surface of the cut second material tail through the L-shaped component.

[0016] Preferably, a joint arranging device is provided for adjusting the position of the material head or the first material tail or the second material tail to ensure that the material head is aligned with the side edge of the first material tail or the second material tail.

[0017] It can be known from the above disclosed technical contents that the method for docking the material head and the material tail of the strip-shaped sound-absorbing cotton on the inner wall of the tire described in the present invention is that the length of the selected sound-absorbing cotton is more than 10 mm greater than the inner circumference length of the tire, and then the sound-absorbing cotton is adhered to the sticky rubber material on the inner wall of the tire, and the first material tail of the sound-absorbing cotton that exceeds the part is overlapped above the material head, and then part of the first material tail is cut off according to actual needs to form a second material tail, and the material head and the second material tail are accurately docked according to the process requirements through a predetermined error correction sound-absorbing cotton margin of more than 10 mm, and then the second material tail is pressed on the sticky rubber material through a first pressing device to ensure that the distance between the second material tail and the material head will not change due to tire manufacturing errors, and at the same time, it can adapt to the combination of sound-absorbing cotton of different materials and rubber materials of different viscosities, and has good versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the sound-absorbing cotton fitting when the inner circumference length T1 of a tire of the same specification in the prior art is greater than the length X of the sound-absorbing cotton.

[0019] Figure 2 This is a schematic diagram of the sound-absorbing cotton fitting when the inner circumference length T2 of a tire of the same specification in the prior art is smaller than the length X of the sound-absorbing cotton.

[0020] Attached Figure 3 Schematic diagram of the sound-absorbing cotton with a length of S in the present invention.

[0021] Attached Figure 4 This is a schematic diagram of the sound-absorbing cotton lamination in which the length S of the sound-absorbing cotton is greater than the fixed length of the inner circumference of a tire T of the same specification.

[0022] Attached Figure 5 It is a schematic diagram of realizing seamless connection between the material head S1 and the second material tail S2A after cutting by the method of the present invention.

[0023] Attached Figure 6 This is a schematic diagram of achieving docking of the material head S1 and the second material tail S2B after cutting with a certain distance reserved by the method of the present invention.

[0024] Attached Figure 7 The figure is a schematic diagram of another form of docking of the material head S1 and the second material tail S2C after cutting with a certain distance reserved by the method of the present invention. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings.

[0026] See attached Figure 3-7 As shown, the present invention discloses a method for docking the head and tail of a strip-shaped sound-absorbing cotton on the inner wall of a tire, wherein the length of the strip-shaped sound-absorbing cotton S is at least 10 mm greater than the inner circumference of the tire T, and the length of the corresponding sound-absorbing cotton S can be set according to the actual tire specifications and the bonding process requirements.

[0027] The docking method of the present invention comprises: firstly providing a tire T, and coating a layer of viscous rubber material J on the inner wall of the tire T; then providing a bonding component (not shown), bonding the sound-absorbing cotton S to the viscous rubber material J on the inner wall of the tire from the material head S1 of the sound-absorbing cotton S as the starting end through the bonding component, and overlapping the first material tail S2 of the sound-absorbing cotton with the material head S1 of the sound-absorbing cotton (as shown in the attached figure); Figure 4 As shown); a cutting device (not shown) is further provided, through which the first tail S2 of the sound-absorbing cotton S that exceeds the inner circumference of the tire T is cut, and the tail connected to the material head S1 after the cut is defined as the second tail; a first pressing device (not shown) is further provided, through which the second tail (S2A; S2B; S2C) of the sound-absorbing cotton S connected to the material head S1 after the cut is pressed onto the adhesive rubber material J on the inner wall of the tire T. Among them, the laminating component can be the technical content disclosed in the prior art No. CN107107501A, or refer to the technical content of the prior invention patent No. 202110719867.2 of the applicant; the cutting device can be a metal heating wire or a cutting knife, etc.; the first pressing device can be a telescopic pressing mechanism with an arc-shaped structural member.

[0028] The method for docking the head and tail of the strip-shaped sound-absorbing cotton on the inner wall of the tire described in the present invention is to use a sound-absorbing cotton with a length greater than 10 mm for error tolerance than the inner circumference of the tire to be bonded, and then accurately cut it to achieve accurate docking of the head and the second tail in strict accordance with the process requirements, and then bond the second tail to the viscous rubber material through the first pressing device. Therefore, the spacing between the second tail and the head in the docking method described in the present invention will not be affected by the error in the inner circumference of the tire. At the same time, the use of this docking method can accommodate the bonding of sound-absorbing cotton of different hardness and rubber materials of different viscosities, has good versatility, and is more suitable for the actual production needs and industrial promotion and application of tire companies.

[0029] Preferably, the present invention may also provide a first detection device (not shown), the main function of which is to determine the cutting angle of the cutting device through the first detection device before the cutting device performs the process of cutting the first material tail. Specifically, the cutting angle of the present invention is preferably that the cutting device and the first material tail overlapped above the material head are cut vertically, such as cutting the metal heating wire or the cutting knife vertically with the first material tail. The first detection device may be a 3D camera or a photoelectric switch, etc.

[0030] In addition, according to the tire customer's requirements for the sound-absorbing cotton laminating process on the inner wall of the tire, a spacing of -5 mm to 20 mm can be reserved between the second tail of the sound-absorbing cotton S formed after cutting and the head S1. Specifically, the "spacing" described in the present invention can be any of the following three situations, which needs to be determined according to the actual requirements of the customer. In the first situation, under ideal conditions, as shown in the attached Figure 5 As shown in FIG. 1 , the material head S1 and the second material tail S2A after cutting are basically closely connected. At this time, the distance between the material head S1 and the second material tail S2A after cutting is 0, but it is difficult to achieve such a cutting effect in actual operation. In the second case, as shown in FIG. Figure 6 As shown, the material head S1 and the second material tail S2B after cutting maintain a certain process required distance. At this time, the distance between the material head S1 and the second material tail S2B after cutting can be 1 to 20 mm; the third situation, as shown in the attached Figure 7 As shown, at this time, the material head S1 and the second material tail S2C may be partially overlapped, and the length of the overlapping part is within 5 mm (i.e. -5 mm). Then, through other operations, the material head S1 and the second material tail S2C can reach the docking state of the first situation, which will be explained in detail in the subsequent content.

[0031] Optionally, the present invention further provides a second detection device (not shown), after the second material tail lamination process, the second detection device detects whether the distance between the second material tail S2A or S2B or S2C and the material head S1 meets the lamination process requirements, if not, an alarm is issued to wait for processing or the tire is directly transferred to the waiting area. The second detection device can be the same as the first detection device, and can also be a 3D camera or a photoelectric switch.

[0032] In addition, the present invention further provides a material taking device (not shown), and before the process of cutting the first material tail S2, the material taking device first grabs and fixes the first material tail S2, and after cutting, the material taking device moves the first material tail S2 out of the inner wall of the tire T to prevent the cut first material tail S2 from interfering with the laminating operation of the sound-absorbing cotton S. The material taking device can be a needle suction cup structure, a vacuum cup adsorption structure, or a mechanical clamping structure.

[0033] When the customer requires the first situation to be achieved for the sound-absorbing cotton laminating process, it can be achieved by optimizing the spacing described in the present invention based on the third situation. Specifically, the present invention also needs to provide a second pressing device (not shown) for applying pressure to the end surface of the second material tail S2C, compressing the second material tail S2C to move it to the outside of the end surface of the material head S1 and releasing the second material tail S2C. The compressed second material tail S2C stretches to finally form the attached Figure 5 The material head S1 and the second material tail S2A are tightly connected. The second pressing device may be provided with an L-shaped component matching the end face of the second material tail S2C of the sound-absorbing cotton, and the L-shaped component applies pressure to the end face of the cut second material tail S2C, so as to indirectly achieve the process requirement of tightly connecting the material head and the second material tail in the first case. Preferably, the L-shaped component may be provided on the first pressing device.

[0034] In addition, the applicant discovered during the experiment that there may be a problem that the sound-absorbing cotton S is offset when it is attached to the inner wall of the tire T, that is, the side of the material head and the first material tail (before cutting) or the second material tail (after cutting) are not aligned. At this time, a joint arrangement device (not shown) can also be provided to adjust the position of the material head S1 or the first material tail or the second material tail to ensure that the material head is aligned with the side of the first material tail or the second material tail, thereby achieving a better fitting effect. Among them, the joint arrangement device can be a needle suction cup structure, a vacuum cup adsorption structure, or a mechanical clamping structure, etc.

[0035] It can be known from the above disclosed technical contents that the method for docking the material head and the material tail of the strip-shaped sound-absorbing cotton on the inner wall of the tire described in the present invention is that the length of the selected sound-absorbing cotton is more than 10 mm greater than the inner circumference length of the tire, and then the sound-absorbing cotton is adhered to the sticky rubber material on the inner wall of the tire, and the first material tail of the sound-absorbing cotton that exceeds the part is overlapped above the material head, and then part of the first material tail is cut off according to actual needs to form a second material tail, and the material head and the second material tail are accurately docked according to the process requirements through a predetermined error correction sound-absorbing cotton margin of more than 10 mm, and then the second material tail is pressed on the sticky rubber material through a first pressing device to ensure that the distance between the second material tail and the material head will not change due to tire manufacturing errors, and at the same time, it can adapt to the combination of sound-absorbing cotton of different materials and rubber materials of different viscosities, and has good versatility.

[0036] The above contents are only some implementation methods of the present application, and their purpose is to illustrate the technical concept and features of the present application. Any equivalent changes or replacement technical solutions that can be easily thought of by any person skilled in the art under the inspiration of the technical content of the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A method for butt-jointing a head and a tail of a strip-shaped sound-absorbing cotton on the inner wall of a tire, wherein the length of the sound-absorbing cotton is greater than the inner circumference length of the tire, and the butt-jointing method comprises: Providing a tire, wherein the inner wall of the tire is coated with a layer of sticky rubber; Providing a laminating component, wherein the laminating component laminat[es] the sound-absorbing cotton onto the sticky rubber material on the inner wall of the tire starting from the head of the sound-absorbing cotton, and overlapping the first tail of the sound-absorbing cotton with the head of the sound-absorbing cotton; A cutting device is provided, and the first tail of the sound-absorbing cotton that exceeds the inner circumference length is cut off by the cutting device; When the length of the overlapped portion of the second tail formed after the sound-absorbing cotton is cut and the head is within 5 mm, a second pressing device is provided, on which an L-shaped member matching the end face of the second tail of the sound-absorbing cotton is provided, and pressure is applied to the end face of the cut second tail through the L-shaped member, and the second tail is compressed and moved to the outside of the end face of the head; A first pressing device is provided, through which the second material tail connected to the material head after the sound-absorbing cotton is cut is pressed onto the sticky rubber material on the inner wall of the tire.

2. The method for butting the head and tail of the strip-shaped sound-absorbing cotton for the inner wall of a tire according to claim 1, characterized in that: A first detection device is provided, and before the first material tail cutting process, a cutting angle of the cutting device is determined by the first detection device.

3. The method for butting the head and tail of the strip-shaped sound-absorbing cotton for the inner wall of a tire according to claim 2, characterized in that: The cutting angle is that the cutting device and the sound-absorbing cotton overlap and cut vertically the first material tail above the material head.

4. The method for butting the head and tail of the strip-shaped sound-absorbing cotton for the inner wall of a tire according to claim 1, characterized in that: A spacing of -5 mm to 20 mm is reserved between the second tail and the head of the sound-absorbing cotton after cutting.

5. The method for butting the head and tail of the strip-shaped sound-absorbing cotton for the inner wall of a tire according to claim 4, characterized in that: A second detection device is provided. After the second material tail lamination process, the second detection device is used to detect whether the distance between the second material tail and the material head meets the process requirements. If it does not meet the requirements, an alarm is issued to wait for processing or the tire is directly transferred to the waiting area.

6. The method for butting the head and tail of the strip-shaped sound-absorbing cotton for the inner wall of a tire according to any one of claims 1 to 5, characterized in that: A material taking device is provided. Before the first material tail is cut, the first material tail is firstly grabbed and fixed by the material taking device. After cutting, the first material tail is moved out of the inner wall of the tire by the material taking device.

7. The method for butting the head and tail of the strip-shaped sound-absorbing cotton for the inner wall of a tire according to any one of claims 1 to 5, characterized in that: The length of the sound-absorbing cotton is at least 10 mm greater than the inner circumference of the tire.

8. The method for butting the head and tail of the strip-shaped sound-absorbing cotton for the inner wall of a tire according to any one of claims 1 to 5, characterized in that: A joint arranging device is provided for adjusting the position of the material head or the first material tail or the second material tail to ensure that the material head is aligned with the side edge of the first material tail or the second material tail.

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