A seamless loop forming device and process for unvulcanized rubber strips

Abstract

The present invention discloses a device and process for seamlessly looping unvulcanized rubber strips. The device includes a workbench and a cutting mechanism and a rolling mechanism mounted on the workbench. The cutting mechanism includes a first heating roller and a second heating roller capable of rotating in opposite directions, a first rotating roller disposed on one side of the second heating roller, a movable second rotating roller, and a cutter capable of abutting against a material wound around the second heating roller to cut the material. The rolling mechanism includes a third heating roller and a fourth heating roller capable of rotating in opposite directions, a third rotating roller disposed on one side of the fourth heating roller, and a movable fourth rotating roller, wherein the surfaces of the third heating roller and / or the fourth heating roller and / or the third rotating roller are provided with a plurality of grooves. The present invention can perform double rolling on the rubber ring, making the surface of the entire looped rubber ring smooth and dense, without joint scars, marks, shadows, bubbles, flocs, and other problems. The tensile strength is significantly improved, the yield rate is high, and the product quality is improved.

Description

Technical Field

[0001] The invention relates to a device and a process for seamlessly looping an unvulcanized rubber strip, belonging to the technical field of looping an unvulcanized rubber strip. Background Art

[0002] Currently, direct pressing is used to connect the joints of semiconductor perfluoroether rubber strips during the looping process. However, for perfluoroether rubber strips with high adhesive content, especially transparent perfluoroether rubber strips, this direct pressing method can lead to uneven heating of the strips, and the joints are prone to scratches, marks, shadows, bubbles, and flocculent deposits. This makes the surface of the entire looped rubber ring uneven and less dense, and is prone to bubbles, thus affecting product quality.

[0003] Therefore, it is urgent to develop a special unvulcanized rubber strip seamless looping equipment and process to solve the above problems. Summary of the Invention

[0004] In order to solve the above problems, the present invention provides a device and process for seamlessly looping unvulcanized rubber strips, which makes the surface of the entire looped rubber ring smooth and dense, thereby ensuring product quality.

[0005] In a first aspect, the present invention provides an unvulcanized rubber strip seamless loop forming device, comprising a workbench and a cutting mechanism and a rolling mechanism installed on the workbench;

[0006] The cutting mechanism includes a first heating roller and a second heating roller capable of rotating in opposite directions, a first rotating roller arranged on one side of the second heating roller, a movable second rotating roller, and a cutting knife capable of abutting against the material wound around the second heating roller to cut the material;

[0007] The rolling mechanism includes a third heating roller and a fourth heating roller capable of rotating in opposite directions, a third rotating roller arranged on one side of the fourth heating roller, and a movable fourth rotating roller, wherein the surfaces of the third heating roller and / or the fourth heating roller and / or the third rotating roller are provided with a plurality of grooves.

[0008] In one embodiment of the present invention, the cutting mechanism also includes a first gear that rotates synchronously with the first heating roller, a second gear that rotates synchronously with the second heating roller, a first rotation drive mechanism driven by the first gear, and a first linear drive mechanism driven by the first heating roller; wherein, the first gear cooperates with the second gear so that the first gear and the second gear can engage with each other, the first rotation drive mechanism is used to drive the first gear and the first heating roller to rotate, and the first linear drive mechanism drives the first heating roller and the first gear to move so that the first gear and the second gear are engaged or not engaged; when the first gear is engaged with the second gear, the first gear drives the second gear and the second heating roller to rotate so that the first heating roller and the second heating roller rotate in opposite directions.

[0009] In one embodiment of the present invention, the cutting mechanism also includes a first base, a first bracket and a first slide rail connected to the first base, a first slider and a first fixed block connected to the first slide rail, a first shaft passing through the first slider, and a second shaft passing through the first fixed block; the first gear and the first heating roller are sleeved outside the first shaft and fixedly connected thereto, the second gear and the second heating roller are sleeved outside the second shaft and fixedly connected thereto, the first rotation drive mechanism is driven and connected to the first gear through the first shaft, the first linear drive mechanism is connected to the first slider, and the first linear drive mechanism drives the first slider, the first shaft, the first heating roller and the first gear to move so that the first gear is engaged or not engaged with the second gear.

[0010] In one embodiment of the present invention, a first support seat and a second support seat are installed on the first base, and the second support seat is installed with a rotatable first rotating roller, and the first rotating roller is located on the side of the second heating roller away from the first heating roller; the first support seat is installed with a rotatable second rotating roller, and the second rotating roller is located above the first rotating roller and can move up and down along the first support seat.

[0011] In one embodiment of the present invention, a rotatable fixed rod is connected above the first bracket, and the fixed rod is fixedly connected to a cutter facing between the second heating rollers. The fixed rod can rotate to make the cutter abut against the material wound around the second heating roller to cut the material.

[0012] In one embodiment of the present invention, the rolling mechanism also includes a third gear that rotates synchronously with the third heating roller, a fourth gear that rotates synchronously with the fourth heating roller, a second rotation drive mechanism driven by the third gear, and a second linear drive mechanism driven by the third heating roller; wherein, the third gear cooperates with the fourth gear so that the third gear and the fourth gear can engage with each other, the second rotation drive mechanism is used to drive the third gear and the third heating roller to rotate, and the second linear drive mechanism drives the third heating roller and the third gear to move so that the third gear and the fourth gear are engaged or not engaged; when the third gear is engaged with the fourth gear, the third gear drives the fourth gear and the fourth heating roller to rotate so that the third heating roller and the fourth heating roller rotate in opposite directions.

[0013] In one embodiment of the present invention, the rolling mechanism also includes a second base, a second bracket and a second slide rail connected to the second base, a second slider and a second fixed block connected to the second slide rail, a third shaft passing through the second slider, and a fourth shaft passing through the second fixed block; the third gear and the third heating roller are sleeved outside the third shaft and fixedly connected thereto, the fourth gear and the fourth heating roller are sleeved outside the fourth shaft and fixedly connected thereto, the second rotation drive mechanism is driven and connected to the third gear through the third shaft, the second linear drive mechanism is connected to the second slider, and the second linear drive mechanism drives the second slider, the third shaft, the third heating roller and the third gear to move so that the third gear is engaged or not engaged with the fourth gear.

[0014] In one embodiment of the present invention, a third support seat and a fourth support seat are installed on the second base, the third support seat is installed with a rotatable third rotating roller, and the third rotating roller is located on the side of the fourth heating roller away from the third heating roller; the fourth support seat is installed with a rotatable fourth rotating roller, and the fourth rotating roller is located above the third rotating roller and can move up and down along the fourth support seat.

[0015] In one embodiment of the present invention, the cross section of the groove is elliptical.

[0016] In a second aspect, the present invention provides a process for seamlessly looping an unvulcanized rubber strip, using the aforementioned device for seamlessly looping an unvulcanized rubber strip, the process comprising the following steps:

[0017] Step 1: preheating the first heating roller and the second heating roller of the cutting mechanism, and using the first linear drive mechanism to drive the first slider to move so that the distance between the first heating roller and the second heating roller is less than the thickness of the rubber strip;

[0018] Step 2: The unvulcanized rubber strip is passed over the second rotating roller of the cutting mechanism and enters between the first heating roller and the second heating roller, then passed under the first rotating roller and connected to the rubber strip tail of the second rotating roller;

[0019] Step 3: The first rotary drive mechanism drives the first heating roller and the second heating roller to rotate in opposite directions, so that the ends of the rubber strip are fused together between the first heating roller and the second heating roller due to the temperature and shear force, forming a bottomless cylindrical rubber blank. After multiple rolling, the rubber blank is made uniform in thickness.

[0020] Step 4: The fixed rod rotates to cause the cutter to contact the rubber blank wound on the second heated roller to cut the rubber blank into rings; the first rotary drive mechanism stops and the first linear drive mechanism drives the first slider to move to separate the first heated roller and the second heated roller, causing the second rotating roller to move downward, removing the rubber blank with a square cross-section and transferring it to the rolling mechanism; after the excess material is removed, the sulfur denaturation is tested, and if qualified, it is re-produced and used;

[0021] Step 5: The rubber blank with a square cross section is placed on the grooves of each roller of the roller pressing mechanism that has been set in position. The second linear drive mechanism drives the second slider to move so that the rubber blank is squeezed between the third heating roller and the fourth heating roller. The height of the fourth rotating roller is adjusted to control the circumference of the entire rubber blank. The second rotary drive mechanism drives the third heating roller and the fourth heating roller to rotate in opposite directions, rolling the rubber blank with a square cross section into a rubber blank with an elliptical cross section. The second rotary drive mechanism is stopped and the second linear drive mechanism drives the second slider to move to separate the third heating roller and the fourth heating roller. The fourth rotating roller is moved downward, and the seamless ring-shaped rubber blank with an elliptical cross section is removed.

[0022] Beneficial effects

[0023] The present invention uses a cutting mechanism to cut the bottomless cylindrical rubber strip into a square-cross-section rubber ring. The rollers provided on the cutting mechanism can perform a single rolling operation on the rubber strip, ensuring a tight connection between the rubber blank joints and avoiding problems such as scratches, marks, shadows, bubbles, and flocs at the joints. The grooves on the surfaces of the rollers of the rolling mechanism can perform a double rolling operation on the rubber ring formed by the cutting mechanism, ultimately transforming the square-cross-section rubber ring into a seamless, oval-cross-section rubber blank. This further ensures a smooth and dense surface of the entire ringed rubber ring, ensuring product quality. Furthermore, unlike the method of rolling the product perpendicular to the axis of a plunger extruder, the ringed rubber ring of the present invention uses a rolling operation parallel to the axis of the product. This eliminates problems such as joint scratches, marks, shadows, bubbles, and flocs, significantly improves tensile strength, and increases the yield rate, thereby enhancing product quality. In addition, a bubble detection program can be set up to puncture the areas with bubbles with a needle that meets the semiconductor cleanliness and magnetic requirements, and then continue rolling until the entire rubber blank surface is smooth, dense, and free of bubbles, so that the sulfur product can pass the seamless inspection under a high-power microscope. The effect is more obvious for perfluoroether rubber strips with a high rubber content, especially transparent perfluoroether rubber strips. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a stereoscopic view from one perspective of the unvulcanized rubber strip seamless looping equipment provided by the present invention.

[0025] Figure 2 This is a stereoscopic view from another perspective of the unvulcanized rubber strip seamless looping equipment provided by the present invention.

[0026] Figure 3 A three-dimensional diagram of the cutting mechanism provided by the present invention.

[0027] Figure 4 The cutting mechanism provided by the present invention does not include a three-dimensional view of the first rotary drive mechanism.

[0028] Figure 5 A three-dimensional diagram of the rolling mechanism provided by the present invention.

[0029] Figure 6 The rolling mechanism provided by the present invention does not include a stereoscopic view of the second rotation drive mechanism.

[0030] In the figure: 1. First linear drive mechanism; 2. Fixed rod; 3. Cutter; 4. First shaft; 5. Second shaft; 6. First gear; 7. Second gear; 8. First support seat; 9. First slider; 10. First fixed block; 11. First rotary drive mechanism; 12. First base; 13. First heating roller; 14. Second heating roller; 15. First rotating roller; 16. Second rotating roller; 17. First bracket; 18. Second support seat; 19. First slide rail; 21. Second rotary drive mechanism Mechanism; 22. Second base; 23. Third heating roller; 24. Fourth heating roller; 25. Third rotating roller; 26. Fourth rotating roller; 27. Second bracket; 28. Third supporting seat; 29. ​​Second slider; 30. Second fixed block; 31. Second linear drive mechanism; 32. Third axis; 33. Fourth axis; 34. Third gear; 35. Fourth gear; 36. Second slide rail; 37. Fourth supporting seat; 100. Cutting mechanism; 200. Rolling mechanism; 300. Workbench. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0032] In the present invention, unless otherwise expressly specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0033] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0034] like Figure 1-6As shown, this embodiment provides a device for seamlessly looping unvulcanized rubber strips, comprising a workbench 300 and a cutting mechanism 100 and a rolling mechanism 200 installed on the workbench 300 .

[0035] In some embodiments, the cutting mechanism 100 includes a first base 12, a first bracket 17 and a first slide rail 19 connected to the first base 12, a first slider 9 and a first fixed block 10 connected to the first slide rail 19, a first shaft 4 passing through the first slider 9, a second shaft 5 passing through the first fixed block 10, a first gear 6 and a first heating roller 13 sleeved outside the first shaft 4 and fixedly connected thereto, a second gear 7 and a second heating roller 14 sleeved outside the second shaft 5 and fixedly connected thereto, a first rotating drive mechanism 11 drivingly connected to the first shaft 4, and a first rotating drive mechanism 11 drivingly connected to the first shaft 4. A first linear drive mechanism 1 connected to a slider 9; wherein the first gear 6 cooperates with the second gear 7 so that the first gear 6 and the second gear 7 can engage with each other, the first rotation drive mechanism 11 is used to drive the first shaft 4, the first gear 6, and the first heating roller 13 to rotate, and the first linear drive mechanism 1 drives the first slider 9 to move so that the first gear 6 and the second gear 7 engage or do not engage; when the first gear 6 and the second gear 7 engage, the first gear 6 drives the second heating roller 14 to rotate through the second shaft 5 so that the first heating roller 13 and the second heating roller 14 rotate in opposite directions.

[0036] In this embodiment, the first linear drive mechanism 1 is capable of driving the first slider 9 to move. When the first linear drive mechanism 1 drives the first slider 9 to move to the first fixed block 10, the first gear 6 and the second gear 7 engage. At this point, the first rotary drive mechanism 11 drives the first gear 6 to rotate. The rotating first gear 6 drives the second gear 7, the second shaft 5, and the second heating roller 14 to rotate, thereby causing the first heating roller 13 and the second heating roller 14 to rotate in opposite directions, thereby squeezing the rubber strip. When the first linear drive mechanism 1 drives the first slider 9 away from the first fixed block 10, the first gear 6 and the second gear 7 separate and become disengaged. At this point, the first gear 6 cannot drive the second gear 7 to rotate, and the first heating roller 13 and the second heating roller 14 separate from each other, allowing the roll-formed rubber blank to be removed.

[0037] Furthermore, a first support seat 8 and a second support seat 18 are installed on the first base 12, and the second support seat 18 is installed with a rotatable first rotating roller 15, and the first rotating roller 15 is located on the side of the second heating roller 14 away from the first heating roller 13; the first support seat 8 is installed with a rotatable second rotating roller 16, and the second rotating roller 16 is located above the first rotating roller 15 and can move up and down along the first support seat 8.

[0038] Furthermore, a rotatable fixed rod 2 is connected above the first bracket 17, and the fixed rod 2 is fixedly connected to a cutter 3 facing between the second heating rollers 14. The fixed rod 2 can rotate to make the cutter 3 abut against the material wound around the second heating roller 14 to cut the material.

[0039] In this embodiment, the number of the first bracket 17, the first linear drive mechanism 1, the first slider 9, the first fixed block 10, and the first slide rail 19 are all two; the first slider 9, the first fixed block 10, and the first slide rail 19 are located within the first bracket 17, the first linear drive mechanism 1 is fixedly connected to one side of the first bracket 17, and the output end of the first linear drive mechanism 1 passes through the first bracket 17 and is connected to the first slider 9; the first heating roller 13 and the second heating roller 14 are rotatably mounted between the two first sliders 9 and the two first fixed blocks 10, respectively, the first fixed blocks 10 are stationary, and the two first linear drive mechanisms 1 respectively drive the two first sliders 9 to move on the two first slide rails 19. Furthermore, because the first shaft 4 is connected to the first rotary drive mechanism 11, the first linear drive mechanism 1 can simultaneously drive the first rotary drive mechanism 11 to slide on the first base 12 while driving the first slider 9 to move.

[0040] The cutting mechanism 100 of this embodiment features a first heating roller 13 and a second heating roller 14 that rotate in opposite directions, generating a shear force. These rollers are capable of controlling the temperature of the rubber strip to soften it by heating it. The first rotating roller 5 is used to determine the second angle of the rubber strip during molding, securing the position of the strip and guiding it as it emerges. The second rotating roller 16 is used to determine the third angle of the rubber strip during molding. It can be moved up and down on the first support 8 to adjust its height and thus determine the dimensions of the rubber strip. A scale is provided on the first support 8 to precisely adjust the height of the second rotating roller 16, thereby precisely determining the dimensions of the rubber strip. Specifically, the second rotating roller 16 is used to adjust the circumference of the entire rubber strip, while the scale on the first support 8 is used to set its position and calculate its circumference. A cutter 3 is provided to cut the bottomless cylindrical rubber strip into square-cross-section rubber rings.

[0041] In some embodiments, the rolling mechanism 200 includes a second base 22, a second bracket 27 and a second slide rail 36 connected to the second base 22, a second slider 29 and a second fixed block 30 connected to the second slide rail 36, a third shaft 32 passing through the second slider 29, a fourth shaft 33 passing through the second fixed block 30, a third gear 34 and a third heating roller 23 sleeved outside the third shaft 32 and fixedly connected thereto, a fourth gear 35 and a fourth heating roller 24 sleeved outside the fourth shaft 33 and fixedly connected thereto, a second rotation drive mechanism 21 drivingly connected to the third shaft 32, and a fourth rotation drive mechanism 21 connected to the second slider 29. 9; wherein the third gear 34 cooperates with the fourth gear 35 so that the third gear 34 and the fourth gear 35 can mesh with each other, the second rotation drive mechanism 21 is used to drive the third shaft 32, the third gear 34, and the third heating roller 23 to rotate, and the second linear drive mechanism 31 drives the second slider 29 to move so that the third gear 34 and the fourth gear 35 are meshed or not meshed; when the third gear 34 is meshed with the fourth gear 35, the third gear 34 drives the fourth heating roller 24 to rotate through the fourth shaft 33 so that the third heating roller 23 and the fourth heating roller 24 rotate in opposite directions.

[0042] In this embodiment, the second linear drive mechanism 31 is capable of driving the second slider 29. When the second linear drive mechanism 31 drives the second slider 29 to the second fixed block 30, the third gear 34 and the fourth gear 35 engage. At this point, the second rotary drive mechanism 21 drives the third gear 34 to rotate. The rotating third gear 34 drives the fourth gear 35, the fourth shaft 33, and the fourth heating roller 24 to rotate, causing the third and fourth heating rollers 23, 24 to rotate in opposite directions, thereby squeezing the rubber strip. When the second linear drive mechanism 31 drives the second slider 29 away from the second fixed block 30, the third gear 34 and the fourth gear 35 separate and become disengaged. At this point, the third gear 34 cannot drive the fourth gear 35 to rotate, and the third and fourth heating rollers 23, 24 separate from each other, allowing the roll-formed, seamless, annular rubber blank with an elliptical cross-section to be removed.

[0043] Furthermore, a third support seat 28 and a fourth support seat 37 are installed on the second base 32, and the third support seat 28 is installed with a rotatable third rotating roller 25, and the third rotating roller 25 is located on the side of the fourth heating roller 24 away from the third heating roller 23; the fourth support seat 37 is installed with a rotatable fourth rotating roller 26, and the fourth rotating roller 26 is located above the third rotating roller 25 and can move up and down along the fourth support seat 37.

[0044] In this embodiment, the number of the second bracket 27, the second linear drive mechanism 31, the second slider 29, the second fixed block 30, and the second slide rail 36 are all two. The second slider 29, the second fixed block 30, and the second slide rail 36 are located within the second bracket 27. The second linear drive mechanism 31 is fixedly connected to one side of the second bracket 27, and the output end of the second linear drive mechanism 31 passes through the second bracket 27 and is connected to the second slider 29. The third heating roller 23 and the fourth heating roller 24 are rotatably mounted between the two second sliders 29 and the two second fixed blocks 30, respectively. The second fixed blocks 30 are stationary, and the two second linear drive mechanisms 31 respectively drive the two second sliders 29 to move on the two second slide rails 36. Since the third shaft 32 is connected to the second rotary drive mechanism 21, the second linear drive mechanism 31 can simultaneously drive the second rotary drive mechanism 21 to slide on the second base 22 while driving the second slider 29 to move.

[0045] Furthermore, a plurality of grooves are formed on the surfaces of the third heating roller 23 , the fourth heating roller 24 and the third rotating roller 25 , and the cross-section of the grooves is elliptical.

[0046] The third and fourth heating rollers 23 and 24 of the rolling mechanism 200 of this embodiment rotate in opposite directions, generating shear force. These rollers determine the first angle of the triangle during preform molding. The third and fourth heating rollers 23 and 24 can be heated and controlled to heat and soften the rubber strip. The third rotating roller 25 determines the second angle of the triangle during preform molding and is used to position and guide the rubber strip as it emerges. The fourth rotating roller 26 determines the third angle of the triangle during preform molding. It can move up and down on the fourth support 37 to adjust its height and determine the dimensions of the preform. A scale is provided on the fourth support 37 to precisely adjust the height of the fourth rotating roller 16, thereby accurately determining the dimensions of the preform. Specifically, the fourth rotating roller 26 is used to adjust the circumference of the entire preform, while the scale on the corresponding fourth support 37 is used to set its position and calculate its circumference. Through the grooves provided on the surfaces of the third heating roller 23, the fourth heating roller 24 and the third rotating roller 25, the square cross-section rubber ring formed by the cutting mechanism 100 can be rolled and pressed, so that the square cross-section rubber ring is eventually transformed into a seamless ring-shaped rubber blank with an elliptical cross-section, thereby completing the entire process of seamlessly forming the unvulcanized rubber strip into a ring.

[0047] Optionally, the first linear drive mechanism 1 and the second linear drive mechanism 31 are cylinders, and the first rotation drive mechanism 11 and the second rotation drive mechanism 21 are motors.

[0048] In addition, the present invention also provides a process for seamlessly looping an unvulcanized rubber strip, using the aforementioned device for seamlessly looping an unvulcanized rubber strip. The process comprises the following steps:

[0049] Step 1: preheat the first heating roller 13 and the second heating roller 14 of the cutting mechanism 100, and use the first linear drive mechanism 1 to drive the first slider 9 to move so that the distance between the first heating roller 13 and the second heating roller 14 is smaller than the thickness of the rubber strip;

[0050] Step 2: The unvulcanized rubber strip passes over the second rotating roller 16 of the cutting mechanism 100 and enters between the first heating roller 13 and the second heating roller 14, then passes under the first rotating roller 15 and connects with the tail of the rubber strip on the second rotating roller 16;

[0051] Step 3: The first rotary drive mechanism 11 drives the first heating roller 13 and the second heating roller 14 to rotate in opposite directions, so that the ends of the rubber strip are fused together between the first heating roller 13 and the second heating roller 14 due to the temperature and shear force, forming a bottomless cylindrical rubber blank. After multiple rolling operations, the rubber blank is made uniform in thickness.

[0052] Step 4: The fixed rod 2 rotates to cause the cutter 3 to contact the rubber blank wound around the second heated roller 14, thereby cutting the rubber blank into rings. The first rotary drive mechanism 11 is stopped, and the first linear drive mechanism 1 drives the first slider 9 to move, separating the first heated roller 13 from the second heated roller 14. The second rotating roller 16 is moved downward, and the rubber blank with a square cross-section is removed and transferred to the rolling mechanism 200. After the excess material is removed, the sulfur denaturation is tested, and if qualified, it is re-produced and used.

[0053] Step 5: Place the square-cross-section rubber blank on the grooves of the rollers of the positioned rolling mechanism 200. The second linear drive mechanism 31 drives the second slider 29 to move so that the rubber blank is squeezed between the third heating roller 23 and the fourth heating roller 24. The height of the fourth rotating roller 26 is adjusted to control the circumference of the entire rubber blank. The second rotary drive mechanism 21 drives the third heating roller 23 and the fourth heating roller 24 to rotate in opposite directions, rolling the square-cross-section rubber blank into an elliptical-cross-section rubber blank. The second rotary drive mechanism 21 is stopped and the second linear drive mechanism 31 drives the second slider 29 to move to separate the third heating roller 23 and the fourth heating roller 24. The fourth rotating roller 26 is moved downward, and the seamless annular rubber blank with an elliptical cross-section is removed.

[0054] The present invention uses a cutting mechanism to cut the bottomless cylindrical rubber strip into a square-cross-section rubber ring. The rollers provided on the cutting mechanism can perform a single rolling operation on the rubber strip, ensuring a tight connection between the rubber blank joints and avoiding problems such as scratches, marks, shadows, bubbles, and flocs at the joints. The grooves on the surfaces of the rollers of the rolling mechanism can perform a double rolling operation on the rubber ring formed by the cutting mechanism, ultimately transforming the square-cross-section rubber ring into a seamless, oval-cross-section rubber blank. This further ensures a smooth and dense surface of the entire ringed rubber ring, ensuring product quality. Furthermore, unlike the method of rolling the product perpendicular to the axis of a plunger extruder, the ringed rubber ring of the present invention uses a rolling operation parallel to the axis of the product. This eliminates problems such as joint scratches, marks, shadows, bubbles, and flocs, significantly improves tensile strength, and increases the yield rate, thereby enhancing product quality. In addition, a bubble detection program can be set up to puncture the areas with bubbles with a needle that meets the semiconductor cleanliness and magnetic requirements, and then continue rolling until the entire rubber blank surface is smooth, dense, and free of bubbles, so that the sulfur product can pass the seamless inspection under a high-power microscope. The effect is more obvious for perfluoroether rubber strips with a high rubber content, especially transparent perfluoroether rubber strips.

[0055] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The above embodiments merely illustrate several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, and all such variations and improvements fall within the scope of protection of the present invention.

[0057] Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above examples is only intended to help understand the method and core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications may be made to the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention. Therefore, the scope of protection of the patent of the present invention shall be based on the appended claims.

Claims

1. A seamless looping device for unvulcanized rubber strips, characterized in that: It includes a workbench and a cutting mechanism and a rolling mechanism installed on the workbench; The cutting mechanism includes a first heating roller and a second heating roller capable of rotating in opposite directions, a first rotating roller arranged on one side of the second heating roller, a movable second rotating roller, and a cutting knife capable of abutting against the material wound around the second heating roller to cut the material; The cutting mechanism further includes a first gear that rotates synchronously with the first heating roller, a second gear that rotates synchronously with the second heating roller, a first rotation drive mechanism drivingly connected to the first gear, and a first linear drive mechanism drivingly connected to the first heating roller; The roller pressing mechanism includes a third heating roller and a fourth heating roller capable of rotating in opposite directions, a third rotating roller arranged on one side of the fourth heating roller, and a movable fourth rotating roller, wherein the surfaces of the third heating roller, the fourth heating roller, and the third rotating roller are provided with a plurality of grooves; The roller pressing mechanism further includes a third gear that rotates synchronously with the third heating roller, a fourth gear that rotates synchronously with the fourth heating roller, a second rotation drive mechanism drivingly connected to the third gear, and a second linear drive mechanism drivingly connected to the third heating roller; The third heating roller and the fourth heating roller rotate in opposite directions to extrude the rubber strip; the cutter cuts the formed rubber strip into a rubber ring with a square cross-section; the grooves provided on the surfaces of the third heating roller, the fourth heating roller and the third rotating roller can roll the rubber ring with a square cross-section formed by the cutting mechanism, so that the rubber ring with a square cross-section is finally transformed into a seamless ring-shaped rubber blank with an elliptical cross-section.

2. The unvulcanized rubber strip seamless loop forming equipment according to claim 1, characterized in that: The first gear cooperates with the second gear so that the first gear and the second gear can mesh with each other, the first rotation drive mechanism is used to drive the first gear and the first heating roller to rotate, and the first linear drive mechanism drives the first heating roller and the first gear to move so that the first gear and the second gear are meshed or not meshed; when the first gear is meshed with the second gear, the first gear drives the second gear and the second heating roller to rotate so that the first heating roller and the second heating roller rotate in opposite directions.

3. The unvulcanized rubber strip seamless loop forming equipment according to claim 2, characterized in that: The cutting mechanism also includes a first base, a first bracket and a first slide rail connected to the first base, a first slider and a first fixed block connected to the first slide rail, a first shaft passing through the first slider, and a second shaft passing through the first fixed block; the first gear and the first heating roller are sleeved outside the first shaft and fixedly connected thereto, the second gear and the second heating roller are sleeved outside the second shaft and fixedly connected thereto, the first rotation drive mechanism is driven and connected to the first gear through the first shaft, the first linear drive mechanism is connected to the first slider, and the first linear drive mechanism drives the first slider, the first shaft, the first heating roller and the first gear to move so that the first gear is engaged or not engaged with the second gear.

4. The unvulcanized rubber strip seamless loop forming equipment according to claim 3, characterized in that: A first supporting seat and a second supporting seat are installed on the first base, and a rotatable first rotating roller is installed on the second supporting seat, and the first rotating roller is located on the side of the second heating roller away from the first heating roller; the first supporting seat is installed with a rotatable second rotating roller, and the second rotating roller is located above the first rotating roller and can move up and down along the first supporting seat.

5. The unvulcanized rubber strip seamless loop forming equipment according to claim 4, characterized in that: A rotatable fixing rod is connected above the first bracket, and the fixing rod is fixedly connected to a cutter facing between the second heating rollers. The fixing rod can rotate to make the cutter contact with the material wound around the second heating roller to cut the material.

6. The unvulcanized rubber strip seamless loop forming equipment according to claim 5, characterized in that: The third gear cooperates with the fourth gear so that the third gear and the fourth gear can engage with each other, the second rotation drive mechanism is used to drive the third gear and the third heating roller to rotate, and the second linear drive mechanism drives the third heating roller and the third gear to move so that the third gear and the fourth gear are engaged or not engaged; when the third gear is engaged with the fourth gear, the third gear drives the fourth gear and the fourth heating roller to rotate so that the third heating roller and the fourth heating roller rotate in opposite directions.

7. The unvulcanized rubber strip seamless loop forming equipment according to claim 6, characterized in that: The rolling mechanism also includes a second base, a second bracket and a second slide rail connected to the second base, a second slider and a second fixed block connected to the second slide rail, a third shaft passing through the second slider, and a fourth shaft passing through the second fixed block; the third gear and the third heating roller are sleeved outside the third shaft and fixedly connected thereto, the fourth gear and the fourth heating roller are sleeved outside the fourth shaft and fixedly connected thereto, the second rotation drive mechanism is driven and connected to the third gear through the third shaft, the second linear drive mechanism is connected to the second slider, and the second linear drive mechanism drives the second slider, the third shaft, the third heating roller and the third gear to move so that the third gear is engaged or not engaged with the fourth gear.

8. The unvulcanized rubber strip seamless loop forming equipment according to claim 7, characterized in that: A third support seat and a fourth support seat are installed on the second base, the third support seat is installed with a rotatable third rotating roller, and the third rotating roller is located on the side of the fourth heating roller away from the third heating roller; the fourth support seat is installed with a rotatable fourth rotating roller, and the fourth rotating roller is located above the third rotating roller and can move up and down along the fourth support seat.

9. A process for seamlessly looping unvulcanized rubber strips, characterized in that: The unvulcanized rubber strip seamless loop forming device according to claim 8 is used, and the process comprises the following steps: Step 1: preheating the first heating roller and the second heating roller of the cutting mechanism, and using the first linear drive mechanism to drive the first slider to move so that the distance between the first heating roller and the second heating roller is less than the thickness of the rubber strip; Step 2: The unvulcanized rubber strip is passed over the second rotating roller of the cutting mechanism and enters between the first heating roller and the second heating roller, then passed under the first rotating roller and connected to the rubber strip tail of the second rotating roller; Step 3: The first rotary drive mechanism drives the first heating roller and the second heating roller to rotate in opposite directions, so that the ends of the rubber strip are fused together between the first heating roller and the second heating roller due to the temperature and shear force, forming a bottomless cylindrical rubber blank. After multiple rolling, the rubber blank is made uniform in thickness. Step 4: The fixed rod rotates to make the cutter contact the rubber blank wound by the second heating roller to cut the rubber blank into rings; The first rotary drive mechanism is stopped and the first linear drive mechanism drives the first slider to move so as to separate the first heating roller and the second heating roller, and the second rotating roller is moved downward. The rubber blank with a square cross section is removed and transferred to the rolling mechanism. After the excess material is removed, the sulfur denaturation is tested, and if it is qualified, it is re-produced and used; Step 5: The rubber blank with a square cross section is placed on the grooves of each roller of the roller pressing mechanism that has been set in position. The second linear drive mechanism drives the second slider to move so that the rubber blank is squeezed between the third heating roller and the fourth heating roller. The height of the fourth rotating roller is adjusted to control the circumference of the entire rubber blank. The second rotary drive mechanism drives the third heating roller and the fourth heating roller to rotate in opposite directions, rolling the rubber blank with a square cross section into a rubber blank with an elliptical cross section. The second rotary drive mechanism is stopped and the second linear drive mechanism drives the second slider to move to separate the third heating roller and the fourth heating roller. The fourth rotating roller is moved downward, and the seamless ring-shaped rubber blank with an elliptical cross section is removed.

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