A method for producing a sealing ring blank

Abstract

The application relates to a sealing ring rubber blank production method, which comprises the following steps: (1) adopting an extruder to extrude rubber into a rubber strip, the extrusion port of the extruder being in a waist shape; (2) cutting the rubber strip extruded by the extruder into short rubber strips with the same length, heating the two end faces of the short rubber strips, and then butting the two end faces to bond the rubber strip end faces into a ring to obtain a ring-shaped rubber blank. Compared with the existing production mode, the work heat-out sheet cutting, rubber cutting, weighing and other processes are omitted, the work load and work intensity of workers are reduced, and the labor cost is reduced. Compared with the manual cutting width mode, the accuracy and consistency of the short rubber strip length can be guaranteed, the weight error of the short rubber strip is small, and the production requirements can be met. In addition, the rubber blank obtained after bonding into a ring is basically the same in shape and size with the final product sealing ring, the ring-shaped rubber blank is used for vulcanization to produce the sealing ring product, the interface size at the two end butt joints of the rubber strip can be avoided, and the quality of the final sealing ring product can be improved.

Description

Technical Field

[0001] This invention relates to a method for producing sealing ring preforms. Background Technology

[0002] Oil pump seals are made from pre-produced rubber blanks through vulcanization. The current production method for oil pump seal blanks is as follows: fluororubber is hot-melted into sheet-like sheets, cooled and shaped, and then irregular portions on both sides of the width are manually trimmed to ensure the sheet width is within 450±5mm. The sheet is then cut into strips using a rubber cutting machine, and the strips are weighed. Strips that meet the weight requirements are used in subsequent processes. However, in actual production, it has been found that this method of producing rubber preforms by cutting rubber sheets into strips has the following shortcomings: 1. It is difficult to ensure uniform thickness of the rubber sheets produced by hot refining, and the error in width due to manual cutting of the rubber sheets is relatively large; this results in a low pass rate of rubber strips cut by the cutting machine, and manual weighing and inspection are still required, making the process cumbersome; 2. There are many manual processing steps, resulting in high labor intensity for workers, high costs, and low production efficiency; 3. The rubber preforms are not bonded into rings, but enter the vulcanization process in the form of rubber strips. Due to the large width error of the manually cut rubber sheets, the final length error of the rubber strips is large, resulting in gaps of varying sizes at the joint after being placed into the mold cavity during vulcanization, which poses a quality risk.

[0003] Because the existing production methods for oil pump sealing ring blanks have the above shortcomings, it is necessary to develop a new method for blank production to solve the above problems. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method for producing sealing ring preforms. The method involves extruding rubber material into strips, cutting the strips into short strips, heating the two ends of the short strips and bonding them together to form a ring, thereby obtaining a ring-shaped preform that is basically the same in shape and size as the final sealing ring. This method can improve the qualification rate of the preforms, ensure product quality, increase production efficiency, and reduce the workload of workers.

[0005] The technical solution to the above-mentioned technical problems is: a method for producing sealing ring blanks, comprising the following steps:

[0006] (1) The rubber compound is extruded into rubber strips using an extruder, and the cross-section of the extrusion nozzle of the extruder is waist-shaped;

[0007] (2) Cut the rubber strips extruded by the extruder into short rubber strips of the same length, then heat the two ends of the short rubber strips and join them together to bond the ends of the rubber strips into a ring, thus obtaining a ring-shaped rubber preform.

[0008] In step (2), a heating block is used to heat the end face of the adhesive strip. The temperature of the heating block is 90-100℃. After pressing the two ends of the adhesive strip into contact with the heating block for 1-2 seconds, the two ends of the adhesive strip are quickly joined together for bonding.

[0009] In step (2), the length of the short rubber strip is 455-460mm and the weight of the short rubber strip is 27.5±0.5g.

[0010] The device used in step (2) is a rubber strip cutting and bonding device, which consists of a rubber strip cutting device and a rubber strip bonding device. The rubber strip bonding device includes a bracket, a front-back moving assembly, a left-right moving assembly, two up-down moving assemblies, two gripping manipulators for gripping the rubber strip, two manipulator rotation motors, two manipulator mounting bases, and a heating block for heating the end face of the rubber strip. The front-back moving assembly includes a belt drive motor, a drive shaft, two sets of synchronous belt slides, and two sets of slider assemblies that cooperate with the synchronous belt slides. The synchronous belt slide includes a slide and a synchronous belt arranged in the slide. The slider assembly is movably mounted on the slide and connected to the synchronous belt. The rear end of the synchronous belt is mounted on the drive shaft, which is connected to the belt drive motor. The slide is mounted on the bracket. The left-right moving assembly includes components fixed to the two slider assemblies. The system includes a longitudinal mounting plate and two lead screw drive motors fixed on the longitudinal mounting plate. The longitudinal mounting plate is equipped with a slide rail, two drive screws respectively connected to the lead screw drive motors, and connecting nuts mounted on the drive screws. The two drive screws are located above and below the slide rails, respectively. The vertical movement assembly includes a connecting plate and a sliding cylinder mounted on the connecting plate. The robot arm mounting base is connected to the sliding cylinder. The connecting plate of one vertical movement assembly is connected to a connecting nut on one drive screw. The connecting plate is also movably connected to the slide rail via a sliding block. Two gripping robots are movably mounted on robot arm mounting bases, and two robot arm rotation motors are fixedly mounted on the two robot arm mounting bases. The gripping robots are connected to the robot arm rotation motors. A heating block is fixed on the bracket, located below the longitudinal mounting plate and between the two slide rails.

[0011] The adhesive strip cutting device includes a driven traction wheel, a driven traction wheel, a motor for the driven traction wheel, a clamping wheel assembly, a cutting blade assembly, a cutting blade motor, a servo manipulator assembly for pulling the adhesive strip, and a vertical mounting plate, a cutting support platform, and an adhesive strip support platform, which are sequentially mounted on a bracket in the direction of adhesive strip feeding. The driven traction wheel, the driven traction wheel, and the clamping wheel assembly are all mounted on the vertical mounting plate, with the clamping wheel assembly located above the driven traction wheel. The driven traction wheel is connected to the motor for the driven traction wheel. The cutting blade assembly includes a cutting blade and a mounting sleeve. The cutting blade is radially mounted on the outer side of the mounting sleeve. The cutting blade assembly... The cutting support platform is connected to the cutter motor via the mounting sleeve. It consists of two separate support blocks, each with a groove for the rubber strip to pass through. One of the support blocks is mounted on a bracket via a support plate located between the vertical mounting plate and the rubber strip support platform. The other support block is fixed to the end of the rubber strip support platform. There is a gap between the two support blocks for the cutter to pass through. The servo manipulator assembly includes a gripping device located above the rubber strip support platform, which is located in front of the two synchronous belt slides of the front-back moving assembly.

[0012] The slider assembly of the forward and backward moving component of the adhesive strip bonding device includes a slider and multiple pulleys. The slider has a groove, which is connected to a timing belt. Multiple pulleys are evenly distributed on both sides of the groove, and the pulleys are in contact with the two sides of the track.

[0013] The clamping wheel assembly of the rubber strip cutting device includes a clamping wheel, a position adjusting plate, and an adjusting screw for adjusting the height of the position adjusting plate. The clamping wheel is movably mounted on the position adjusting plate via a wheel axle. One end of the position adjusting plate is mounted on a vertical mounting plate via a connecting screw. The adjusting screw is mounted on the vertical mounting plate via a mounting block. The adjusting screw passes through the mounting block and is threadedly connected to the mounting block. The bottom end of the adjusting screw abuts against the other end of the position adjusting plate. The clamping wheel is located above the traction drive wheel.

[0014] Due to the above structure, the present invention has the following beneficial effects:

[0015] 1. This invention uses an extruder to extrude rubber material into strips, which are then transported by a traction machine to a cutting machine for cutting into short strips of a certain length. Compared with existing production methods, this invention eliminates the need for workers to perform hot refining, sheeting, cutting, and weighing. Compared to manual cutting, this invention's method of cutting long strips into short strips ensures greater accuracy and consistency in length, resulting in smaller weight errors for each strip, meeting production requirements, and improving the yield rate of rubber preforms. Furthermore, it reduces the workload and intensity of workers, lowers labor costs, eliminates the manual weighing process, and simplifies the production process.

[0016] 2. The adhesive strip bonding device of this invention uses a gripping robot to grasp the adhesive strip, heats the end face of the adhesive strip, and directly bonds the two ends of the adhesive strip together to form a ring, resulting in a high degree of mechanization. The resulting rubber preform after bonding is basically the same in shape and size as the final sealing ring. Using the ring-shaped rubber preform for vulcanization to produce the sealing ring product can solve the problem of inaccurate rubber strip length due to large manual cutting errors when using the original production method of rubber strip vulcanization, which easily leads to gaps at the joint of the two ends of the rubber strip when placed into the vulcanization mold, thus improving the quality of the final sealing ring product.

[0017] 3. This invention employs a production device combining a rubber strip cutting device and a rubber strip bonding device. The rubber strip cutting device, through a traction driven wheel, a traction driving wheel, a pressure wheel assembly, and a servo robotic arm assembly for pulling the rubber strip, can pull long rubber strips through the cutting blade assembly, and then cut the long rubber strips into short rubber strips that meet the required length. The short rubber strips obtained after cutting are directly grasped by the gripping robotic arm for heating and bonding into coils, resulting in high production efficiency.

[0018] 4. Fluororubber is expensive, so the weight of the sealing ring blanks must be strictly controlled to save costs. In actual production, the weight error of each blank is required to be within ±0.5g. This small error range also allows for a small allowable error in the length of each short rubber strip. The rubber strip cutting device of this invention uses a servo robotic arm assembly to pull the rubber strip. The length of the rubber strip passing through the cutter is controlled by the movement position of the servo robotic arm assembly, resulting in high precision and meeting production requirements.

[0019] 5. The cutter of the adhesive strip cutting device of this invention is driven by a motor. The motor drives the cutter to rotate and cut, and then resets. Therefore, the entire cutting and resetting action is rapid. Combined with the rapid pulling of the adhesive strip by the servo robot component, it can achieve the effect of fast cutting speed and high work efficiency. In addition, the cutting speed of the whole machine can be controlled by adjusting the speed of the motor and the pulling speed of the adhesive strip by the servo robot component to match the production speed of the preceding and following processes. The operation is easy.

[0020] The technical features of a sealing ring preform production method of the present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0021] Figure 1 One of the perspective views of a method for producing a sealing ring preform according to the present invention.

[0022] Figure 2 : Front view of a method for producing a sealing ring preform according to the present invention.

[0023] Figure 3 : A second perspective view of a method for producing a sealing ring preform according to the present invention.

[0024] Figure 4: Schematic diagram of the connection between the slider assembly and the timing belt of the present invention.

[0025] Figure 5 : A perspective view of the adhesive strip cutting device of the present invention.

[0026] Figure 6 : Figure 5 Enlarged view of part A.

[0027] Figure 7 : Figure 5 Enlarged view of part B.

[0028] Figure 8 Top view of the adhesive strip cutting device of the present invention.

[0029] In the diagram, P represents the cut adhesive strip. Detailed Implementation

[0030] Example: A method for producing a sealing ring preform, comprising the following steps:

[0031] (1) Fluororubber is extruded into rubber strips using an extruder. The extrusion nozzle of the extruder has a waist-shaped cross section.

[0032] (2) Cut the rubber strips extruded by the extruder into short rubber strips of the same length, then heat the two ends of the short rubber strips and join them together to bond the ends of the rubber strips into a ring, thus obtaining a ring-shaped rubber preform.

[0033] In this embodiment, in step (2), a heating block is used to heat the end face of the adhesive strip. The temperature of the heating block is 90-100℃. After pressing the two ends of the adhesive strip into contact with the heating block for 1-2 seconds, the two ends of the adhesive strip are quickly joined together for bonding. The length of the short adhesive strip is 455-460mm, and the weight of the short adhesive strip is 27.5±0.5g.

[0034] In this embodiment, the device used in step (2) is a tape cutting and bonding device, which consists of a tape cutting device and a tape bonding device, such as... Figures 1-8As shown, the adhesive strip bonding device includes a bracket 1, a front-to-back moving assembly 2, a left-to-right moving assembly 3, two up-to-down moving assemblies 7, two gripping robotic arms 8 for gripping the adhesive strip, two robotic arm rotating motors 4, two robotic arm mounting bases 10, and a heating block 9 for heating the end face of the adhesive strip. The front-to-back moving assembly 2 includes a belt drive motor 21, a drive shaft 22, two sets of synchronous belt slides, and two sets of slider assemblies 25 that cooperate with the synchronous belt slides. The synchronous belt slide includes a slide 24 and a synchronous belt 23 arranged in the slide. The slider assembly 25 is movably mounted on the slide 24 and connected to the synchronous belt 23. The rear end of the synchronous belt is mounted on the drive shaft 22, and the drive shaft is connected to the belt drive motor 21. The slide is mounted on the bracket through a support block 6. The left-right moving component 3 includes a longitudinal mounting plate 33 fixed to two slider components and two lead screw drive motors 31 fixed to the longitudinal mounting plate. The longitudinal mounting plate is equipped with a slide rail 35, two drive lead screws 34 respectively connected to the lead screw drive motors, and connecting nuts 32 mounted on the drive lead screws. The two drive lead screws 34 are located above and below the slide rail 35, respectively. The up-down moving component 7 includes a connecting plate 71 and a sliding cylinder 72 mounted on the connecting plate. The robot arm mounting base 10 is connected to the sliding cylinder 72. The connecting plate 71 of one up-down moving component is connected to a connecting nut 32 on one drive lead screw. The connecting plate 71 is also movably connected to the slide rail 35 via a sliding block. Two gripping robots 8 are movably mounted on the robot arm mounting base 10, and two robot arm rotation motors 4 are fixedly mounted on the two robot arm mounting bases. The gripping robots are connected to the robot arm rotation motors. A heating block 9 is fixed to a bracket, located below the longitudinal mounting plate and between the two slide rails.

[0035] The adhesive strip cutting device includes a traction driven wheel 53, a traction driving wheel 52, a driving wheel motor 511, a pressure wheel assembly 55, a cutter assembly 58, a cutter motor 56, a servo manipulator assembly 510 for pulling the adhesive strip, and a vertical mounting plate 54, a cutting support table 59, and an adhesive strip support platform 51, which are sequentially mounted on a bracket in the direction of adhesive strip feeding. The traction driven wheel 53, the traction driving wheel 52, and the pressure wheel assembly 55 are all mounted on the vertical mounting plate 54. The pressure wheel assembly is located above the traction driving wheel. The traction driving wheel 52 is connected to the driving wheel motor 511. The cutter assembly 58 includes a cutter 581 and a mounting sleeve 582. The cutter 581 is radially mounted on the outer side of the mounting sleeve 582. The cutter assembly is connected to the cutter motor 56 through the mounting sleeve 582. The cutting support table 59 consists of two separate... The system comprises two support blocks 591, each with a groove 592 for the adhesive strip to pass through. One of the support blocks of the cutting support platform is mounted on a bracket via a support plate 57, which is located between the vertical mounting plate 54 and the adhesive strip support platform 51. The other support block is fixed to the end of the adhesive strip support platform. There is a gap between the two support blocks 591 for the cutter 581 to pass through. The top surface of the support plate 57, the bottom surface of the groove of the support block 591, and the top surface of the adhesive strip support platform 51 are at the same height. The servo robot assembly includes a gripping device 5101, which is located above the adhesive strip support platform. The adhesive strip support platform is located in front of the two synchronous belt slides of the front and rear moving components. When the slider assembly of the front and rear moving components moves to the front end of the synchronous belt slide, the gripping robot is located directly above the adhesive strip support platform.

[0036] In this embodiment, the slider assembly 25 of the adhesive strip bonding device front and back moving component 2 includes a slider 251 and multiple pulleys 252. The slider has a groove, which is connected to the timing belt 23. Multiple pulleys are evenly distributed on both sides of the groove, and the pulleys are in contact with the two sides of the slide.

[0037] In this embodiment, the clamping wheel assembly 55 of the adhesive strip cutting device includes a clamping wheel 551 that cooperates with the traction drive wheel 52 to clamp the adhesive strip, a position adjusting plate 554, and an adjusting screw 552 for adjusting the height of the position adjusting plate. The clamping wheel is movably mounted on the position adjusting plate via a wheel axle 555. One end of the position adjusting plate 554 serves as a connecting end and is mounted on a vertical mounting plate 54 via a connecting screw 556. The adjusting screw 552 is mounted on the vertical mounting plate 54 via a mounting block 553, and passes through the mounting block and is threadedly connected to it. The bottom end of the adjusting screw 552 abuts against the other end of the position adjusting plate 554, i.e., the movable end. The clamping wheel 551 is located above the traction drive wheel 52. The surfaces of the traction driven wheel 53 and the clamping wheel 551 have adhesive strip guide grooves. The surface of the traction drive wheel 52 is provided with fine lines to increase friction.

[0038] The bracket 1 shown in the accompanying drawings of this invention is a simplified schematic structure. The specific structure of the bracket can be adjusted and changed according to actual needs.

[0039] The extruder structure described in this invention is the same as that in the prior art. The servo manipulator assembly includes a gripping device 5101 for gripping and pulling the rubber strip, a transverse CNC slide 5102, and a cylinder for controlling the up and down movement of the gripping device. Its specific structure is the same as that in the prior art, and will not be described in detail here.

[0040] The working process of the adhesive strip cutting and bonding device used in this embodiment is as follows: The long adhesive strip extruded by the extruder is transported by the traction machine to the traction driven wheel 53 of the adhesive strip cutting device 5. Then it is clamped by the clamping wheel 551 and the traction driving wheel 52 and pushed forward. At this time, the traction driven wheel 53, the clamping wheel 551 and the traction driving wheel 52 all rotate synchronously. After the long adhesive strip passes through the cutting support table 59, it is sent to the adhesive strip support platform 51. At this time, the gripping device slides to the left along the transverse CNC slide table to the top of the end of the long adhesive strip. The gripping device moves down to clamp the end of the long adhesive strip, and then moves up and slides to the right a certain distance along the transverse CNC slide table. After the gripping device moves into position, the gripping robot 8 moves by the forward and backward moving component 2 and the left and right moving component 8. Component 3 moves above the adhesive strip support platform 51 of the adhesive strip cutting device 5. Then, the gripping robot arm moves downwards to grip the adhesive strip via the up-and-down movement component 7. The cutting blade of the adhesive strip cutting device 5 then cuts the adhesive strip. After cutting, the gripping device releases the adhesive strip, and the gripping robot arm 8 grips the strip, moves upwards and backwards, and simultaneously moves towards the center, approaching the heating block 9. At the same time, the robot arm rotation motor 4 controls the rotation of the gripping robot arm, so that both ends of the gripped adhesive strip face the heating block. The gripping robot arm continues to move until both ends of the adhesive strip contact the heating block for heating. After heating, the gripping robot arm quickly moves the adhesive strip outwards from the heating block and then forwards, finally quickly pressing the two ends of the adhesive strip together to complete the adhesive strip bonding into a ring. The bonded adhesive ring falls directly to the collection area below. Repeat the above steps to perform the adhesive strip bonding work.

[0041] As a variation of this embodiment, the length and weight parameters of the short rubber strip in step (2) can be adjusted according to actual needs. Rubber blanks can also be produced using rubber compounds with other compositions.

Claims

1. A method for producing a sealing ring preform, characterized in that: Includes the following steps: (1) The rubber compound is extruded into rubber strips using an extruder, and the cross-section of the extrusion nozzle of the extruder is waist-shaped; (2) Cut the extruded rubber strips into short strips of the same length, then heat the two ends of the short rubber strips and join them together to bond the ends of the rubber strips into a ring, and obtain a ring-shaped rubber preform. The weight error of each rubber preform should be within ±0.5g. The device used in step (2) is a rubber strip cutting and bonding device, which consists of a rubber strip cutting device and a rubber strip bonding device. The rubber strip bonding device includes a bracket (1), a front-back moving assembly (2), a left-right moving assembly (3), two up-down moving assemblies (7), two gripping manipulators (8) for gripping the rubber strip, two manipulator rotating motors (4), two manipulator mounting bases (10), and a heating block (9) for heating the end face of the rubber strip. The front-back moving assembly includes a belt drive motor (21), a drive shaft (22), two sets of synchronous belt slides, and two sets of slider assemblies (25) that cooperate with the synchronous belt slides respectively. The synchronous belt slide includes a slide (24) and a synchronous belt (23) arranged in the slide. The slider assembly is movably mounted on the slide and connected to the synchronous belt. The rear end of the synchronous belt is mounted on the drive shaft, which is connected to the belt drive motor. The slide is mounted on the bracket. The left-right moving assembly includes a fixed The vertical mounting plate (33) on the two slider assemblies and the two screw drive motors (31) fixed on the vertical mounting plate are equipped with a slide rail (35), two drive screws (34) respectively connected to the screw drive motors and a connecting nut (32) installed on the drive screws. The two drive screws are located above and below the slide rails respectively. The vertical moving assembly includes a connecting plate (71) and a sliding cylinder (72) installed on the connecting plate. The robot arm mounting base is connected to the sliding cylinder. The connecting plate of one vertical moving assembly is connected to the connecting nut (32) on one drive screw. The connecting plate is also movably connected to the slide rail through a sliding block. Two gripping robots are movably mounted on the robot arm mounting base. Two robot arm rotating motors are fixedly mounted on the two robot arm mounting bases respectively. The gripping robot is connected to the robot arm rotating motor. The heating block is fixed on the bracket. The heating block is located below the vertical mounting plate and between the two slide rails. The adhesive strip cutting device includes a traction driven wheel (53), a traction driving wheel (52), a driving wheel motor (511), a pressure wheel assembly (55), a cutter assembly (58), a cutter motor (56), a servo manipulator assembly (510) for pulling the adhesive strip, and a vertical mounting plate (54), a cutting support table (59), and an adhesive strip support platform (51) installed sequentially on the bracket in the direction of adhesive strip feeding. The traction driven wheel, the traction driving wheel, and the pressure wheel assembly are all mounted on the vertical mounting plate. The pressure wheel assembly is located above the traction driving wheel. The traction driving wheel is connected to the driving wheel motor. The cutter assembly includes a cutter (581) and a mounting sleeve (582). The cutter is radially mounted... The cutter assembly is connected to the cutter motor via the mounting sleeve and is mounted on the outer side of the mounting sleeve. The cutting support platform is composed of two separate support blocks (591). The support blocks have grooves (592) for the rubber strip to pass through. One of the support blocks of the cutting support platform is mounted on the bracket via a support plate (57). The support plate is located between the vertical mounting plate and the rubber strip support platform. The other support block is fixed at the end of the rubber strip support platform. There is a gap between the two support blocks for the cutter to pass through. The servo manipulator assembly includes a gripping device (5101). The gripping device is located above the rubber strip support platform. The rubber strip support platform is located in front of the two synchronous belt slides of the front and rear moving assembly. The working process of the adhesive strip cutting and bonding device is as follows: The long adhesive strip extruded by the extruder is transported by the traction machine to the traction driven wheel (53) of the adhesive strip cutting device (5), and then clamped by the clamping wheel (551) and the traction driving wheel (52) and pushed forward. At this time, the traction driven wheel (53), the clamping wheel (551) and the traction driving wheel (52) all rotate synchronously. After the long adhesive strip passes through the cutting support table (59), it is sent to the adhesive strip support platform (51). At this time, the gripping device slides to the left along the transverse CNC slide table to the top of the end of the long adhesive strip. The gripping device moves down to clamp the end of the long adhesive strip, and then moves up and slides to the right a certain distance along the transverse CNC slide table. After the gripping device moves into place, the gripping robot (8) moves forward and backward through the front and back moving components (2) and left and right. The component (3) moves above the adhesive strip support platform (51) of the adhesive strip cutting device (5), and then controls the gripping robot to move down and grab the adhesive strip by the up and down moving component (7). Then the cutter of the adhesive strip cutting device (5) cuts the adhesive strip. After the adhesive strip is cut, the gripping device releases the adhesive strip. The gripping robot (8) grabs the adhesive strip and moves up and backward and moves towards the center to approach the heating block (9). At the same time, the robot rotates the motor (4) to control the gripping robot to rotate so that the two ends of the gripped adhesive strip face the heating block. The gripping robot continues to move so that the two ends of the adhesive strip contact the heating block for heating. After heating, the gripping robot grabs the adhesive strip and moves quickly to the outside of the heating block and then moves forward. Finally, the two ends of the adhesive strip are quickly joined and pressed together to complete the work of bonding the adhesive strip into a circle.

2. The method for producing a sealing ring blank according to claim 1, characterized in that: In step (2), a heating block is used to heat the end face of the adhesive strip. The temperature of the heating block is 90-100℃. After pressing the two ends of the adhesive strip into contact with the heating block for 1-2 seconds, the two ends of the adhesive strip are quickly joined together for bonding.

3. The method for producing a sealing ring blank according to claim 1, characterized in that: In step (2), the length of the short rubber strip is 455-460mm and the weight of the short rubber strip is 27.5±0.5g.

4. The method for producing a sealing ring blank according to claim 1, characterized in that: The slider assembly of the front and rear moving component of the adhesive strip bonding device includes a slider (251) and multiple pulleys (252). The slider has a groove, which is connected to a timing belt. Multiple pulleys are evenly distributed on both sides of the groove, and the pulleys are in contact with the two sides of the slide.

5. The method for producing a sealing ring blank according to claim 1, characterized in that: The clamping wheel assembly (55) of the rubber strip cutting device includes a clamping wheel (551), a position adjusting plate (554), and an adjusting screw (552) for adjusting the height of the position adjusting plate. The clamping wheel is movably mounted on the position adjusting plate via a wheel axle (555). One end of the position adjusting plate (554) is mounted on the vertical mounting plate (54) via a connecting screw (556). The adjusting screw (552) is mounted on the vertical mounting plate (54) via a mounting block (553). The adjusting screw passes through the mounting block and is threadedly connected to the mounting block. The bottom end of the adjusting screw abuts against the other end of the position adjusting plate. The clamping wheel (551) is located above the traction drive wheel (52).

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