Method for bonding spring clamp and rubber

Abstract

The invention relates to the field of automobile engineering, in particular to a method for bonding a spring clamp and rubber, which comprises the following steps: surface treatment: cleaning the surface of a clamp metal plate, and polishing the surface of the clamp metal plate to be bonded with the rubber; glue coating is conducted, specifically, glue and a vulcanizing agent are dropwise added to the center of the clamp metal plate, a coating disc is driven to rotate through a driving assembly until the whole coating disc is full of the glue and the vulcanizing agent, operation of the driving assembly is stopped, and the conveying mechanism conveys the clamp metal plate coated with the glue to the rubber vulcanization position; rubber is bonded to the surface of the clamp metal plate and compacted, and then the rubber is fed into vulcanization equipment to be subjected to rubber vulcanization treatment; and cooling and curing: cooling and curing the fixture metal plate subjected to the rubber vulcanization treatment to complete the bonding of the steel plate spring fixture and the rubber. According to the bonding method, the surface of the clamp metal plate can be coated with the glue and the vulcanizing agent more simply, conveniently, efficiently and accurately, and the bonding quality is improved.

Description

Technical Field

[0001] The invention relates to the field of automobile engineering, and in particular to a bonding method between a spring clamp and rubber. Background Art

[0002] Leaf springs, also known as leaf springs, are one of the most widely used elastic elements in automobile suspensions. Leaf springs are mainly composed of spring leaves, end members and clamps. The main function of the leaf spring clamp is to stabilize and fix the position of the leaf spring, ensuring that the spring leaf remains in the correct position during use. When a car is driving on a bumpy road, the leaf spring floats up and down due to gravity. At this time, friction between the leaf spring and the fixing clamp occurs, causing noise and wear. In order to solve the above problems, wear-resistant rubber is often glued to the two inner sides of the clamp to reduce the rigid friction between the leaf spring and the fixing clamp, thereby reducing noise and wear.

[0003] In the production process of leaf spring fixtures, rubber is bonded to the surface of the leaf spring fixture sheet metal, usually by coating glue and then vulcanizing the rubber, which can ensure the stability between the rubber and the sheet metal. The glue coating step is crucial, and the uniformity of the glue coating directly affects the subsequent rubber vulcanization quality. The existing glue coating methods include the following:

[0004] Brushing method: Use a brush to evenly apply glue on the surface of the spring; this method is suitable for small batch production or local coating; and the uniformity and thickness of the glue applied by this method are manually controlled, so this method is generally not suitable.

[0005] Spraying method: Use a spray gun to spray the glue evenly on the entire spring surface; this method is suitable for large areas or batch production, but it is difficult to avoid over-spraying, which may lead to uneven thickness of the glue coating and may also cause glue waste; and it has high requirements on the pressure of the spraying equipment and the angle of the nozzle, which has certain operating difficulties.

[0006] Roller coating method: Roll the spring on a roller pre-coated with glue to make the glue evenly adhere to the surface of the spring; the coating thickness of the roller coating method is affected by factors such as the roller and the applied pressure. It is relatively difficult to accurately control due to mechanical vibration and environmental factors, which can easily lead to uneven glue coating thickness.

[0007] In summary, in the process of bonding the leaf spring clamp to the rubber, the existing glue coating method is difficult to ensure the uniformity of the glue coating, which can easily affect the vulcanization quality of the rubber; therefore, it is urgent to propose a bonding method between the spring clamp and the rubber to improve the uniformity of the glue coating. Summary of the invention

[0008] The purpose of the present invention is to provide a method for bonding a spring clamp and rubber, so as to solve the problem that the existing glue coating method is difficult to ensure the coating uniformity of the glue and is easy to affect the vulcanization quality of the rubber.

[0009] In order to achieve the above object, the technical solution of the present invention is as follows: A method for bonding a spring clamp and rubber, comprising:

[0010] Surface treatment: Clean the surface of the fixture sheet metal and polish the surface of the fixture sheet metal to be bonded with rubber;

[0011] Glue coating: The fixture sheet metal to be coated with glue is conveyed by the conveying mechanism, the fixture sheet metal on the conveying mechanism is pushed into the coating disc by the first cylinder, and the fixture sheet metal is fixed in the positioning groove, glue and vulcanizing agent are dripped at the center of the fixture sheet metal, and the coating disc is driven to rotate by the driving component until the glue and vulcanizing agent cover the entire coating disc, the driving component is stopped, and after a preset static time, the fixture sheet metal is pushed away from the positioning groove by the driving component, and the fixture sheet metal is retrieved back to the conveying mechanism by the first cylinder and the electromagnet on the output shaft of the first cylinder, and the conveying mechanism conveys the fixture sheet metal coated with glue to the rubber vulcanization site;

[0012] Rubber vulcanization: The rubber is bonded to the surface of the fixture sheet metal and compacted, and then sent to the vulcanization equipment for rubber vulcanization treatment;

[0013] Cooling and curing: The fixture sheet metal after rubber vulcanization treatment is cooled and cured to complete the bonding of the leaf spring fixture and the rubber.

[0014] Furthermore, the surface treatment process step also includes grinding the surface of the clamp sheet metal to which the rubber is to be bonded, and then applying a metal treatment agent to the ground surface of the clamp sheet metal.

[0015] Furthermore, in the glue coating process step, the maximum length of the positioning groove is smaller than the diameter of the coating disc, and the center of the positioning groove is on the axis of the coating disc.

[0016] Furthermore, in the glue coating process step, the clamp sheet metal is fixed around the positioning groove by air bags around the positioning groove.

[0017] Furthermore, in the glue coating process step, the coating disc is covered by a covering disc so that the covering disc rotates synchronously with the coating disc and a gap is left between the lower surface of the covering disc and the upper surface of the coating disc. The limiting ring at the edge of the covering disc is abutted against the edge of the coating disc, and the glue and vulcanizer on the surface of the coating disc are limited by the limiting ring at the edge of the covering disc.

[0018] Furthermore, in the glue coating process step, the glue and the vulcanizing agent are uniformly dispersed by guiding the capillary strips arranged on the lower surface of the covering disc, so that the glue and the vulcanizing agent are dispersed around the coating disc along with the capillary strips during the uniform rotation of the coating disc.

[0019] Furthermore, the capillary strips are evenly distributed on the lower surface of the covering disk in the circumferential direction, and the two ends of the capillary strips correspond to the glue and vulcanizing agent dripping positions and the inner side wall of the limiting ring at the edge of the covering disk respectively.

[0020] Furthermore, the coating uniformity of the glue and the vulcanizer is monitored by the electrode strip at the center of the capillary strip, and the resistance value between two adjacent electrode strips is detected in turn, and the coating uniformity of the glue and the vulcanizer is judged based on the resistance value between the two adjacent electrode strips.

[0021] Furthermore, the driving component adopts a uniformly variable speed motion during operation. In the glue coating process step, the speed of the driving component is gradually increased until the glue and the vulcanizer cover the entire coating disc.

[0022] The above scheme has the following beneficial effects:

[0023] 1. The present invention uniformly spreads glue and vulcanizer in the coating disc by centrifugation, and the size of the fixture sheet metal is completely covered by the coating disc, thereby ensuring that the glue and vulcanizer are spread on the surface of the fixture sheet metal; compared with the brushing method, this method has higher efficiency, higher uniformity of glue coating and more precise thickness; compared with the spraying method, the requirements for pressure and angle are lower, and the operation is simpler; compared with the roller coating method, it is not easily affected by mechanical vibration and environmental factors; in summary, the bonding method of the present invention can more simply, efficiently and accurately coat the surface of the fixture sheet metal with glue and vulcanizer, thereby improving the bonding quality.

[0024] 2. The present invention guides the dispersion of glue and vulcanizer through capillary strips. Due to the effect of surface tension, the glue and vulcanizer dripped on the center of the fixture sheet metal will form a number of small water droplets, making it difficult to form a uniform coating. Since there is also surface tension on the surface of the capillary strip, when the capillary strip is wetted, the surface tension will form a concave arc on the surface of the capillary strip, and the glue and vulcanizer will flow along the direction of the capillary strip, thereby improving the efficiency of uniform coating of the glue and vulcanizer.

[0025] 3. The present invention monitors the dispersion uniformity of glue and vulcanizing agent through electrode strips. In the initial stage of coating, the electrode strips are similar to point contacts, and the current mainly flows through small areas where the glue and vulcanizing agent are not evenly dispersed, resulting in a large local current density and a correspondingly large resistance. On the contrary, as the glue and vulcanizing agent are dispersed, the resistance between adjacent electrode strips gradually decreases, thereby judging the coating uniformity of the glue and vulcanizing agent, and adjusting the operation of the coating disc according to the coating uniformity, so as to adapt to different glues and vulcanizing agents and fixture sheet metal parts, control the coating time, shorten the time-consuming glue coating process steps in the bonding process, and ensure the quality of glue coating.

[0026] 4. Compared with the existing glue coating method, the present invention can collect the excess glue and vulcanizer after coating the fixture sheet metal, or reuse them when coating in the same batch, which can save the amount of glue and vulcanizer and avoid waste; at the same time, it can prevent the glue and vulcanizer from spreading into the air and causing harm to the human body and the environment.

[0027] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a flow chart of an embodiment of a method for bonding a spring clamp and rubber according to the present invention;

[0029] Figure 2 Axonometric view of a coating device of an embodiment of a method for bonding a spring clamp to rubber according to the present invention;

[0030] Figure 3 A schematic diagram of the structure of a driving assembly according to an embodiment of a method for bonding a spring clamp to a rubber according to the present invention;

[0031] Figure 4 It is a partial enlarged schematic diagram of a coated disc in an embodiment of a method for bonding a spring clamp to rubber according to the present invention;

[0032] Figure 5 A bottom view of a cover plate of an embodiment of a method for bonding a spring clamp to rubber according to the present invention;

[0033] Figure 6 A cross-sectional view of a capillary strip according to an embodiment of a method for bonding a spring clamp to rubber according to the present invention.

[0034] The figure marks in the drawings of the specification include: 1. glue dripping platform; 2. coating base; 3. drip nozzle; 4. covering plate; 5. coating disc; 6. positioning groove; 7. conveying platform; 8. first cylinder; 9. servo motor; 10. conveyor belt; 11. second cylinder; 12. driving shaft; 13. support plate; 14. airbag; 15. conveying groove; 16. limiting ring; 17. capillary strip; 18. electrode strip; 19. storage box. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] The following is further described in detail through specific implementation methods:

[0039] Example 1

[0040] As attached Figure 1 As shown: A method for bonding a spring clamp and rubber, comprising the following process steps:

[0041] Surface treatment: Clean the surface of the clamp sheet metal and polish the surface of the clamp sheet metal to which the rubber is to be bonded; wherein, the surface of the clamp sheet metal is cleaned to remove grease, oxides and other contaminants on the surface of the clamp sheet metal to avoid affecting the subsequent glue coating process steps. Solvent cleaning, pickling or other surface treatment methods can be used. In this embodiment, the clamp sheet metal surface is cleaned by pickling.

[0042] Among them, the surface of the clamp sheet metal to be bonded to the rubber is polished to improve the adhesion of the surface of the sheet metal to be bonded to the rubber and improve the effect of the subsequent glue coating process steps. The polishing can be performed by frosting, mechanical polishing, etc. This embodiment uses mechanical polishing for polishing.

[0043] In addition, in the surface treatment process step, after the surface of the fixture sheet metal to be bonded with the rubber is polished, a metal treatment agent is applied to the polished surface of the fixture sheet metal to improve the subsequent bonding strength to the rubber.

[0044] Glue coating: In this embodiment, this process step is achieved by a coating device, such as the attached Figure 2-4 As shown, the coating device includes a controller, a conveying mechanism and a coating base 2. The conveying mechanism is arranged on the side wall of the coating base 2. The conveying mechanism is composed of a conveying table 7 and a plurality of first cylinders 8 fixed on the side wall of the conveying table 7. The output shaft of the first cylinder 8 passes through the side wall of the conveying table 7 and extends to above the surface of the conveying table 7. An electromagnet is fixedly connected to the output shaft of the first cylinder 8.

[0045] The coating base 2 is rotatably connected to a plurality of coating discs 5, and a positioning groove 6 is provided on the coating disc 5. A driving assembly corresponding to the coating disc 5 is arranged in the coating base 2, and the driving assembly includes a servo motor 9, and the servo motor 9 is connected to a driving shaft 12 through a conveyor belt 10, and the driving shaft 12 is fixedly connected to the coating disc 5. It also includes a second cylinder 11, and the output shaft sleeve of the second cylinder 11 is arranged in the driving shaft 12 and does not contact the driving shaft 12. The output shaft of the second cylinder 11 extends into the positioning groove 6 and is fixedly connected to a support plate 13, and the support plate 13 is slidably matched with the positioning groove 6.

[0046] A glue dripping platform 1 is fixedly connected above the coating base 2, and a storage box 19 for containing glue and vulcanizing agent is fixedly connected to the top of the glue dripping platform 1. A third cylinder corresponding to the coating disc 5 is arranged in the glue dripping platform 1, and the output shaft of the third cylinder extends above the coating disc 5, and the axis of the output shaft of the third cylinder coincides with the axis of the coating disc 5, and the end face of the output shaft of the third cylinder is fixedly connected with a drip nozzle 3 for dripping glue and vulcanizing agent; the controller is used to control the operation of the first cylinder 8, the second cylinder 11, the third cylinder, the servo motor 9, the drip nozzle 3 and the conveying platform 7.

[0047] The glue coating process steps specifically include: placing the surface treated fixture sheet metal on the conveying mechanism, conveying the fixture sheet metal to be coated with glue through the conveying mechanism, pushing the fixture sheet metal on the conveying mechanism into the coating disc 5 through the first cylinder 8, and fixing the fixture sheet metal in the positioning groove 6.

[0048] Glue and vulcanizing agent are dripped on the center of the fixture sheet metal, and the coating disc 5 is driven to rotate by the driving component until the glue and vulcanizing agent cover the entire coating disc 5, and the driving component is stopped;

[0049] After being stationary for a preset time, the driving assembly pushes the clamp sheet metal away from the positioning groove 6, and the first cylinder 8 and the electromagnet on the output shaft of the first cylinder 8 cooperate to retrieve the clamp sheet metal to the conveying mechanism, and the conveying mechanism conveys the clamp sheet metal coated with glue to the rubber vulcanization site.

[0050] This process step mainly disperses the glue and vulcanizer evenly on the surface of the fixture sheet metal by centrifugation. In this process, the glue and vulcanizer will disperse to the surrounding. In order to promote the uniform dispersion of the glue and the vulcanizer, the maximum length of the positioning groove 6 should be smaller than the diameter of the coating disc 5 to ensure that the positioning groove 6 is covered as a whole in the coating disc 5 and the center of the positioning groove 6 is on the axis of the coating disc 5, so that the added glue and vulcanizer can accurately land on the center position of the fixture sheet metal.

[0051] The fixation of the clamp sheet metal is achieved in this embodiment by arranging airbags 14 around the positioning groove 6. The clamp sheet metal is fixed around the airbags 14. The airbags 14 are connected to the air pump. When inflated, the airbags 14 squeeze and fix the clamp sheet metal around. After the glue is applied, the airbags 14 are deflated, which facilitates the driving component to push the radius after the glue is applied away from the positioning groove 6.

[0052] In order to prevent glue and vulcanizing agent from splashing around, a cover disc 4 is rotatably connected to the output shaft of the third cylinder, and a limiting ring 16 is integrally formed on the edge of the cover disc 4. The coating disc 5 is covered by the cover disc 4, so that the cover disc 4 rotates synchronously with the coating disc 5, and a gap is left between the lower surface of the cover disc 4 and the upper surface of the coating disc 5. The limiting ring 16 on the edge of the cover disc 4 abuts against the edge of the coating disc 5, and the glue and vulcanizing agent on the surface of the coating disc 5 are limited by the limiting ring 16 on the edge of the cover disc 4. At the same time, the coating disc 5 is embedded in the coating base 2, and a transmission groove 15 is provided on the corresponding coating base 2. The height of the coating disc 5 is lower than the transmission groove 15, and the transmission of the fixture sheet metal is realized through the transmission groove 15. A channel for collecting waste glue and vulcanizing agent is provided at the contact position between the coating disc 5 and the coating base 2. During the glue coating process, the glue and vulcanizing agent dispersed to the surrounding due to the centrifugal effect are blocked by the limiting ring 16. After the glue coating is completed, the waste glue and vulcanizing agent are collected through the channel for collecting the waste glue and vulcanizing agent.

[0053] During the operation of the driving component, instantaneous acceleration or deceleration can easily cause the glue and the vulcanizer to be excessively dispersed to one side. Therefore, the controller controls the servo motor 9, and the servo motor 9 adopts a uniform variable speed motion during operation to avoid excessive dispersion of the glue and the vulcanizer to one side; and the speed of the driving component is gradually increased until the glue and the vulcanizer cover the entire coating disc 5, thereby promoting efficient and uniform coating of the glue and the vulcanizer.

[0054] Rubber vulcanization: The rubber is bonded to the surface of the fixture sheet metal and compacted, and then sent to the vulcanization equipment for rubber vulcanization. During the bonding process, ensure good contact between the fixture sheet metal and the rubber, and secondly ensure that the pressing force of each part is uniform during the compaction process; the vulcanization equipment automatically performs vulcanization treatment, changes the physical and chemical properties of the rubber, and improves its strength, elasticity and wear resistance.

[0055] Cooling and curing: Cool and cure the fixture sheet metal after rubber vulcanization to ensure the stability and strength of the bonding, and complete the bonding between the leaf spring fixture and the rubber.

[0056] Example 2

[0057] As attached Figure 5-6 As shown, the difference from Example 1 is that a capillary strip 17 is fixedly connected to the lower surface of the cover plate 4, and the capillary strip 17 is evenly distributed on the lower surface of the cover plate 4 in the circumferential direction, and the two ends of the capillary strip 17 correspond to the glue and vulcanizing agent dripping positions and the inner side wall of the limiting ring 16 at the edge of the cover plate 4. The capillary strip 17 is made of fiber material, and an electrode strip 18 is fixedly connected to the center thereof, and the length of the electrode strip 18 is equal to that of the capillary strip 17, and a certain distance is reserved between the capillary strip 17 and the ground of the limiting ring 16, and the distance is preferably equal to the total coating thickness of the glue and the vulcanizing agent.

[0058] In the glue coating process, the capillary strip 17 provided on the lower surface of the covering disk 4 is used to guide the uniform dispersion of the glue and the vulcanizing agent, so that the glue and the vulcanizing agent are dispersed around the coating disk 5 along with the capillary strip 17 during the uniform rotation of the coating disk 5. At the same time, the coating uniformity of the glue and the vulcanizing agent is monitored by the electrode strip 18 at the center of the capillary strip 17, and the resistance value between two adjacent electrode strips 18 is detected in turn, and the coating uniformity of the glue and the vulcanizing agent is judged based on the resistance value between the two adjacent electrode strips 18.

[0059] The principle of the electrode strips 18 monitoring the coating uniformity of the glue and the vulcanizing agent is that as the coating disk 5 rotates, the glue and the vulcanizing agent gradually disperse to the surroundings, and the contact area of ​​the glue and the vulcanizing agent between adjacent electrode strips 18 gradually increases as the coating of the glue and the vulcanizing agent becomes more uniform. In the initial coating stage, the electrode strips 18 are similar to point contacts, and the current mainly flows through small areas of unevenly dispersed glue and vulcanizing agent, resulting in a large local current density and a correspondingly large resistance. On the contrary, as the glue and the vulcanizing agent disperse, the resistance between adjacent electrode strips 18 gradually decreases, thereby judging the coating uniformity of the glue and the vulcanizing agent.

[0060] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A method for bonding a spring clamp to a rubber, characterized in that: include: Surface treatment: Clean the surface of the fixture sheet metal and polish the surface of the fixture sheet metal to be bonded with rubber; Glue coating: The fixture sheet metal to be coated with glue is conveyed by the conveying mechanism, the fixture sheet metal on the conveying mechanism is pushed into the coating disc by the first cylinder, and the fixture sheet metal is fixed in the positioning groove, glue and vulcanizing agent are dripped at the center of the fixture sheet metal, and the coating disc is driven to rotate by the driving component until the glue and vulcanizing agent cover the entire coating disc, the driving component is stopped, and after a preset static time, the fixture sheet metal is pushed away from the positioning groove by the driving component, and the fixture sheet metal is retrieved back to the conveying mechanism by the first cylinder and the electromagnet on the output shaft of the first cylinder, and the conveying mechanism conveys the fixture sheet metal coated with glue to the rubber vulcanization site; Rubber vulcanization: The rubber is bonded to the surface of the fixture sheet metal and compacted, and then sent to the vulcanization equipment for rubber vulcanization treatment; Cooling and curing: The fixture sheet metal after rubber vulcanization treatment is cooled and cured to complete the bonding of the leaf spring fixture and the rubber.

2. The bonding method between a spring clamp and rubber according to claim 1, characterized in that: The surface treatment process also includes grinding the surface of the clamp sheet metal to which the rubber is to be bonded, and then applying a metal treatment agent to the ground surface of the clamp sheet metal.

3. The bonding method between a spring clamp and rubber according to claim 1, characterized in that: In the glue coating process step, the maximum length of the positioning groove is smaller than the diameter of the coating disc, and the center of the positioning groove is on the axis of the coating disc.

4. The bonding method between a spring clamp and rubber according to claim 3, characterized in that: In the glue coating process step, the clamp sheet metal is fixed around the positioning groove by air bags around the positioning groove.

5. The bonding method between a spring clamp and rubber according to claim 1, characterized in that: In the glue coating process step, the coating disc is covered by a covering disc, so that the covering disc rotates synchronously with the coating disc, and a gap is left between the lower surface of the covering disc and the upper surface of the coating disc. The limiting ring at the edge of the covering disc is abutted against the edge of the coating disc, and the glue and vulcanizer on the surface of the coating disc are limited by the limiting ring at the edge of the covering disc.

6. The method for bonding a spring clamp to rubber according to claim 5, characterized in that: In the glue coating process, the capillary strips arranged on the lower surface of the covering disc are used to guide the uniform dispersion of the glue and the vulcanizer, so that the glue and the vulcanizer are dispersed around the coating disc along with the capillary strips during the uniform rotation of the coating disc.

7. The bonding method between a spring clamp and rubber according to claim 6, characterized in that: The capillary strips are evenly distributed on the lower surface of the covering plate in the circumferential direction, and the two ends of the capillary strips correspond to the glue and vulcanizing agent dripping positions and the inner side wall of the limiting ring at the edge of the covering plate respectively.

8. The method for bonding a spring clamp to rubber according to claim 7, characterized in that: The coating uniformity of the glue and the vulcanizer is monitored through the electrode strip at the center of the capillary strip, and the resistance value between two adjacent electrode strips is detected in turn. The coating uniformity of the glue and the vulcanizer is judged based on the resistance value between the two adjacent electrode strips.

9. The method for bonding a spring clamp to a rubber according to claim 1, characterized in that: The drive assembly adopts a uniformly variable speed motion during operation. In the glue coating process step, the speed of the drive assembly is gradually increased until the glue and vulcanizer cover the entire coating disc.

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