Rubber tube shaping core rod structure

Abstract

The invention relates to the technical field of rubber tube shaping, in particular to a rubber tube shaping core rod structure which comprises a core rod body, a positioning ring is fixedly connected to the top of the core rod body, a square head is fixedly connected to the top of the positioning ring, a first V-shaped groove and a second V-shaped groove are formed in the core rod body, and a processing barrel is arranged on the outer side of the core rod body. According to the core rod, the first V-shaped groove and the second V-shaped groove are formed in the core rod body, and in the heating, pressurizing and shaping process of the pipe blank, the inner-layer rubber of the pipe blank can be guided to be fully filled into the groove body. After shaping is completed, a circle of protruding boss structures can be formed in the inner holes in the two ends of the rubber pipe, the bosses can effectively restrain elastic shrinkage of the rubber pipe after demolding, the size distortion defects of horn mouths, ellipses and the like at the ends are reduced fundamentally, the diameter precision and the roundness precision of the inner holes of the rubber pipe are greatly improved, and the adaptability of the rubber pipe and a follow-up connecting piece is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of rubber tube shaping technology, and in particular to the structure of rubber tube shaping mandrels. Background Technology

[0002] The rubber tube shaping mandrel is a core component in rubber tube extrusion molding, ensuring precise inner hole dimensional shaping and guaranteeing inner wall molding quality. It works in conjunction with the extruder die head and outer mold. Its structural design revolves around core shaping requirements such as dimensional accuracy, smooth demolding, stable melt flow, venting and impurity removal, and wear and temperature resistance. The basic frame serves as the main molding support structure, with functionally optimized structures. Mandrels of different specifications of rubber tubes are specifically designed to be adapted to the basic structure. Currently, when demolding rubber tubes, after the tube preform is fitted into the mandrel for shaping, the inner diameter of both ends of the tube will show flared or elliptical shapes. When demolding defects such as flared or elliptical shapes appear at both ends of the tube preform after being shaped by the mandrel, the temperature of the mandrel, die head, outer mold, and tube preform itself during the cutting and demolding process is all relatively high, and direct contact may pose a risk of burns. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the present invention provides a rubber tube shaping mandrel structure.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a rubber tube shaping mandrel structure, comprising a mandrel body, a positioning ring fixedly connected to the top of the mandrel body, a square head fixedly connected to the top of the positioning ring, a first V-groove and a second V-groove on the mandrel body, a processing cylinder on the outer side of the mandrel body, a starting assembly for processing the rubber tube inside the processing cylinder, a movable cylinder and a trigger block inside the starting assembly, the cooperation of the movable cylinder and the trigger block providing power for processing the rubber tube, a positioning cover inside the starting assembly, the positioning cover being fixedly connected to the top of the processing cylinder, the positioning cover... The upper part has two semi-annular holes for placing movable rods. A movable rod is movably connected to each of the two semi-annular holes on the positioning cover. A wedge block is fixedly connected to the bottom of each movable rod. An annular groove for placing the wedge block is provided on the outer side of the movable cylinder. Both wedge blocks are fixedly connected in the annular groove of the movable cylinder, and the movable cylinder is set on the top of the positioning ring. Two trigger blocks are fixedly connected to the outer side of the movable cylinder. The trigger blocks are both inclined triangular in shape, and the two trigger blocks are distributed on the outer side of the movable cylinder. When the movable cylinder moves the trigger block to the position of the corresponding trigger post, the trigger block and the trigger post are in contact.

[0005] Through the above technical solution, after the tube blank is fitted into the mandrel body, during the heating and pressurizing shaping process, the rubber of the inner layer of the tube blank will fill the groove of the mandrel, preventing the tube from shrinking during the shaping process, thereby achieving the consistency of the pre-reserved cutting length at both ends. After shaping, the inner hole of both ends of the tube has a whole ring of raised bosses. These bosses provide the conditions for precise positioning of the tube cutting process. The square head is used to fix it on the vulcanizing car to prevent the tube core from falling or rotating after the mandrel is placed on the vulcanizing car. During the tube blank fitting process, the positioning ring plays a positioning role to prevent excessive fitting, resulting in the tail end being too short. When it is necessary to cut the rubber tube, the device is placed on top of the positioning ring, and then the movable rod is rotated. When the movable rod rotates, it drives the wedge block to rotate. When the wedge block rotates, it drives the movable cylinder to rotate. When the movable cylinder rotates, it drives the two trigger blocks to rotate.

[0006] As a preferred embodiment of the present invention, the outer side of the processing cylinder is provided with a self-cutting component for cooperating with the starting component. The self-cutting component contains a mating block and a cutting ring. The rubber tube can be cut off through the cooperation of the mating block and the cutting ring. The self-cutting component contains two positioning rings, each with a trigger pin inserted into it. A fixed frame is fixedly connected to the outer side of the processing cylinder, and a supporting column is fixedly connected to each fixed frame. A movable frame is movably connected to the outer side of each supporting column. A fixed column is fixedly connected to each trigger pin, and the outer side of each fixed column is movably connected to the movable frame. A connecting column is movably connected to the end of each movable frame away from the fixed column. The self-cutting component also includes a positioning shell, which is fixedly connected to the bottom of the processing cylinder. The outer side of the positioning shell has two corresponding placement holes for placing positioning rods, and a positioning rod is inserted into each of the two placement holes. The rod and two mating blocks are both located inside the positioning shell. Each mating block is fixedly connected to the corresponding positioning rod. A cutting ring is fixedly connected to each mating block. A bearing rod is fixedly connected to the opposite end of each positioning rod away from the mating block. The end of each bearing rod away from the positioning rod is movably connected to a connecting post. Two movable frames are fixedly connected to the bottom of the positioning shell. A movable shell is fixedly connected to the bottom of each movable frame. A limiting post is fixedly connected inside each movable shell. A movable block is movably connected to the outside of the limiting post. A connecting block is fixedly connected to the top of the movable block. Each connecting block is fixedly connected to the corresponding bearing rod. A spring is sleeved on the outside of each limiting post. The two ends of the spring are fixedly connected to the inner wall of the corresponding movable shell and the movable block, respectively. The movable shell is provided with an elongated hole for the movement of the connecting block. The connecting block is inserted into the elongated hole of the movable shell.

[0007] With the above technical solution, when the trigger block rotates, it rotates to the position of the corresponding trigger post. Then, the trigger block pushes the trigger post to move, and the trigger post moves towards the position of the positioning ring. When the trigger post moves, it pushes the movable frame to rotate along the bearing post. When the movable frame rotates, it pushes the connecting post to move. When the connecting post moves, it pushes the bearing rod to move. The bearing rod pushes the positioning rod to move. When the positioning rod moves, it pushes the mating block to move. When the mating block moves, it drives the cutting ring to cut the rubber tube on the first V-groove. When the bearing rod moves, it drives the connecting block to move. When the connecting block moves, it drives the movable block to move. When the movable block moves, it drives the limiting post to compress. When the trigger block rotates to a position away from the trigger post, the compressed spring rebounds and drives the movable block to reset. The reset of the movable block drives the bearing rod to reset.

[0008] Compared with the prior art, the beneficial effects that this invention can achieve are:

[0009] 1. This invention, through the first and second V-shaped grooves provided on the mandrel body, guides the inner layer of rubber in the tube blank to fully fill the grooves during the heating and pressurizing process of the tube blank. After the shaping is completed, a raised boss structure will be formed around the inner holes at both ends of the tube. This boss can effectively restrain the elastic shrinkage of the tube after demolding, fundamentally reducing dimensional distortion defects such as end flaring and elliptical shapes, significantly improving the diameter accuracy and roundness accuracy of the inner hole of the tube, and ensuring the compatibility of the tube with subsequent connectors.

[0010] 2. This invention utilizes the bosses at both ends of the shaped hose as precise positioning references for the hose cutting process. The cutting ring of the self-cutting component can quickly align with the bosses, avoiding the offset errors that easily occur during traditional manual positioning, ensuring a high degree of consistency in the cutting length of each hose. This design effectively improves the dimensional uniformity of hoses in the same batch and reduces the product scrap rate caused by dimensional deviations.

[0011] 3. This invention achieves convenient operation of the cutting process through the linkage design of the starting component and the self-cutting component. The operator only needs to rotate the movable rod on the positioning cover to drive the mating block, movable cylinder and trigger block to rotate synchronously, thereby driving the trigger column, movable frame and other components to work together, and finally drive the cutting ring to complete the precise cutting of the hose. The whole process does not require additional complicated cutting tooling, greatly reducing the number of steps and improving the efficiency of the cutting operation.

[0012] 4. This invention utilizes a spring structure within the movable shell at the bottom of the positioning shell. After cutting, the trigger block rotates away from the trigger post, and the compressed spring drives the movable block, connecting block, and bearing rod to quickly reset. This, in turn, drives the positioning rod, mating block, and cutting ring back to their initial positions, shortening the preparation time for repetitive operations, improving the turnover efficiency of the mandrel, reducing wear on components due to manual adjustments, and extending the overall service life of the equipment. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0014] Figure 2 This is a schematic diagram of the main structure of the mandrel of the present invention;

[0015] Figure 3 This is a schematic diagram of the positioning shell structure of the present invention;

[0016] Figure 4 This is a schematic diagram of the movable cylinder structure of the present invention;

[0017] Figure 5 This is a schematic diagram of the fixed frame structure of the present invention;

[0018] Figure 6 This is a schematic diagram of the load-bearing rod structure of the present invention;

[0019] Figure 7 This is a schematic diagram of the active block structure of the present invention.

[0020] The components are as follows: 1. Core rod body; 2. Square head; 3. Positioning ring; 4. First V-groove; 5. Second V-groove; 6. Processing cylinder; 7. Fixing frame; 8. Positioning ring; 9. Trigger post; 10. Positioning cover; 11. Movable rod; 12. Movable cylinder; 13. Fitting block; 14. Trigger block; 15. Fixing post; 16. Bearing post; 17. Connecting post; 18. Bearing rod; 19. Positioning rod; 20. Mating block; 21. Cutting ring; 22. Movable shell; 23. Limiting post; 24. Spring; 25. Movable block; 26. Connecting block; 27. Positioning shell; 28. Extension hole; 29. ​​Movable frame. Detailed Implementation

[0021] To make the technical means, creative features, and achieved objectives and effects of this invention easier to understand, the invention is further described below with reference to specific embodiments. However, the following embodiments are merely preferred embodiments of this invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described herein without creative effort are all within the protection scope of this invention. Unless otherwise specified, the experimental methods in the following embodiments are conventional methods, and the materials and reagents used in the following embodiments are commercially available unless otherwise specified.

[0022] Example: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, a rubber tube shaping mandrel structure includes a mandrel body 1. A positioning ring 3 is fixedly connected to the top of the mandrel body 1, and a square head 2 is fixedly connected to the top of the positioning ring 3. The mandrel body 1 has a first V-groove 4 and a second V-groove 5. A processing cylinder 6 is provided on the outside of the mandrel body 1. The processing cylinder 6 has an initiation assembly for processing the rubber tube. The initiation assembly has a movable cylinder 12 and a trigger block 14. The cooperation of the movable cylinder 12 and the trigger block 14 can provide power for processing the rubber tube. The initiation assembly has a positioning cover 10, which is fixedly connected to the top of the processing cylinder 6. The positioning cover 10 has two positions for placing the movable cylinder 12. The semi-annular holes of rod 11 and the two semi-annular holes on the positioning cover 10 are movably connected to a movable rod 11. The bottom of each movable rod 11 is fixedly connected to a wedge block 13. The outer side of the movable cylinder 12 is provided with an annular groove for placing the wedge block 13. The two wedge blocks 13 are fixedly connected in the annular groove of the movable cylinder 12. The movable cylinder 12 is set on the top of the positioning ring 3. The two trigger blocks 14 are fixedly connected to the outer side of the movable cylinder 12. The trigger blocks 14 are all inclined triangular. The two trigger blocks 14 are distributed on the outer side of the movable cylinder 12. When the movable cylinder 12 drives the trigger blocks 14 to move to the position of the corresponding trigger post 9, the trigger blocks 14 and the trigger post 9 are in contact.

[0023] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, after the tube blank is fitted into the mandrel body, during the heating and pressurizing shaping process, the rubber of the inner layer of the tube blank will fill the groove of the mandrel to prevent the tube from shrinking during the shaping process, thereby achieving the consistency of the pre-reserved cutting length at both ends. After shaping, the inner hole of both ends of the tube has a raised boss, which provides the conditions for precise positioning of the tube cutting process. The square head is used to fix it on the vulcanizing car to prevent the tube core from falling or rotating after the mandrel is placed on the vulcanizing car. During the tube blank fitting process, the positioning ring plays a positioning role to prevent excessive fitting and resulting in the tail end being too short. When it is necessary to cut the rubber tube, the device is placed on top of the positioning ring 3, and then the movable rod 11 is rotated. When the movable rod 11 rotates, it drives the mating block 13 to rotate. When the mating block 13 rotates, it drives the movable cylinder 12 to rotate. When the movable cylinder 12 rotates, it drives the two trigger blocks 14 to rotate.

[0024] like Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the outer side of the processing cylinder 6 is provided with a self-cutting assembly for cooperating with the starting assembly. The self-cutting assembly contains a mating block 20 and a cutting ring 21. The rubber tube can be cut off through the cooperation of the mating block 20 and the cutting ring 21. The self-cutting assembly contains two positioning rings 8, each with a trigger pin 9 inserted into it. A fixing frame 7 is fixedly connected to the outer side of the processing cylinder 6. A bearing pin 16 is fixedly connected to each fixing frame 7. A movable frame 29 is movably connected to the outer side of the bearing pin 16. A fixing pin 15 is fixedly connected to each trigger pin 9. The outer side of the fixing pin 15 is movably connected to the movable frame 29. A connecting pin 17 is movably connected to the end of each movable frame 29 away from the fixing pin 15. The self-cutting assembly also includes a positioning shell 27, which is fixedly connected to the bottom of the processing cylinder 6. The outer side of the positioning shell 27 has two corresponding placement holes for placing positioning rods 19. A positioning rod 19 is inserted into each of the two placement holes of the positioning shell 27. Both mating blocks 20 are located in the positioning... Inside the housing 27, each mating block 20 is fixedly connected to a corresponding positioning rod 19. A cutting ring 21 is fixedly connected to each mating block 20. A bearing rod 18 is fixedly connected to the opposite end of each positioning rod 19 away from the mating block 20. One end of each bearing rod 18 away from the positioning rod 19 is movably connected to a connecting post 17. Two movable frames 29 are fixedly connected to the bottom of the positioning housing 27. A movable housing 22 is fixedly connected to the bottom of each movable frame 29. A limiting post 23 is fixedly connected inside each movable housing 22. A movable block 25 is movably connected to the outside of the limiting post 23. A connecting block 26 is fixedly connected to the top of the movable block 25. Each connecting block 26 is fixedly connected to a corresponding bearing rod 18. A spring 24 is sleeved on the outside of each limiting post 23. The two ends of the spring 24 are fixedly connected to the inner wall of the corresponding movable housing 22 and the movable block 25, respectively. The movable housing 22 is provided with an elongated hole for the movement of the connecting block 26. The connecting block 26 is inserted into the elongated hole of the movable housing 22.

[0025] like Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7As shown, when the trigger block 14 rotates, it rotates to the position of the corresponding trigger post 9. Then, the trigger block 14 pushes the trigger post 9 to move, and the trigger post 9 moves towards the position of the positioning ring 8. When the trigger post 9 moves, it pushes the movable frame 29 to rotate along the bearing post 16. When the movable frame 29 rotates, it pushes the connecting post 17 to move. When the connecting post 17 moves, it pushes the bearing rod 18 to move. The bearing rod 18 pushes the positioning rod 19 to move. When the positioning rod 19 moves, it pushes the mating block 20 to move. When the mating block 20 moves, it drives the cutting ring 21 to cut the rubber tube on the first V-groove 4. When the bearing rod 18 moves, it drives the connecting block 26 to move. When the connecting block 26 moves, it drives the movable block 25 to move. When the movable block 25 moves, it drives the limiting post 23 to compress. When the trigger block 14 rotates to a position away from the trigger post 9, the compressed spring 24 rebounds and drives the movable block 25 to reset. The reset of the movable block 25 drives the bearing rod 18 to reset.

[0026] Working principle:

[0027] First step, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, after the tube blank is fitted into the mandrel body, during the heating and pressurizing shaping process, the rubber of the inner layer of the tube blank will fill the groove of the mandrel to prevent the tube from shrinking during the shaping process, thereby achieving the consistency of the pre-reserved cutting length at both ends. After shaping, the inner hole of both ends of the tube has a raised boss, which provides the conditions for the tube cutting process to accurately position the tube. The square head is used to fix it on the vulcanizing car to prevent the tube core from falling or rotating after the mandrel is placed on the vulcanizing car. During the tube blank fitting process, the positioning ring plays a positioning role to prevent excessive fitting, resulting in the tail end being too short. When it is necessary to cut the rubber tube, the device is placed on top of the positioning ring 3, and then the movable rod 11 is rotated. When the movable rod 11 rotates, it drives the wedge block 13 to rotate. When the wedge block 13 rotates, it drives the movable cylinder 12 to rotate. When the movable cylinder 12 rotates, it drives the two trigger blocks 14 to rotate.

[0028] The second step, as Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7As shown, when the trigger block 14 rotates, it rotates to the position of the corresponding trigger post 9. Then, the trigger block 14 pushes the trigger post 9 to move, and the trigger post 9 moves towards the position of the positioning ring 8. When the trigger post 9 moves, it pushes the movable frame 29 to rotate along the bearing post 16. When the movable frame 29 rotates, it pushes the connecting post 17 to move. When the connecting post 17 moves, it pushes the bearing rod 18 to move. The bearing rod 18 pushes the positioning rod 19 to move. When the positioning rod 19 moves, it pushes the mating block 20 to move. When the mating block 20 moves, it drives the cutting ring 21 to cut the rubber tube on the first V-groove 4. When the bearing rod 18 moves, it drives the connecting block 26 to move. When the connecting block 26 moves, it drives the movable block 25 to move. When the movable block 25 moves, it drives the limiting post 23 to compress. When the trigger block 14 rotates to a position away from the trigger post 9, the compressed spring 24 rebounds and drives the movable block 25 to reset. The reset of the movable block 25 drives the bearing rod 18 to reset.

[0029] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A rubber tube shaping mandrel structure, comprising a mandrel body (1), characterized in that, The top of the mandrel body (1) is fixedly connected to a positioning ring (3), the top of the positioning ring (3) is fixedly connected to a square head (2), the mandrel body (1) is provided with a first V-groove (4) and a second V-groove (5), and the outer side of the mandrel body (1) is provided with a processing cylinder (6).

2. The rubber tube shaping mandrel structure according to claim 1, characterized in that, The processing cylinder (6) is equipped with a starting assembly for processing rubber tubes. The starting assembly is equipped with a movable cylinder (12) and a trigger block (14). The movable cylinder (12) and the trigger block (14) can provide power for processing rubber tubes through their cooperation. The outer side of the processing cylinder (6) is provided with a self-cutting component for cooperating with the starting component. The self-cutting component is provided with a mating block (20) and a cutting ring (21). The rubber tube can be cut off by the cooperation of the mating block (20) and the cutting ring (21).

3. The rubber tube shaping mandrel structure according to claim 2, characterized in that, The starting assembly is provided with a positioning cover (10), which is fixedly connected to the top of the processing cylinder (6). The positioning cover (10) has two semi-annular holes for placing the movable rod (11). A movable rod (11) is movably connected to each of the two semi-annular holes on the positioning cover (10). A fitting block (13) is fixedly connected to the bottom of each movable rod (11). An annular groove for placing the fitting block (13) is provided on the outside of the movable cylinder (12). Two fitting blocks (13) are fixedly connected in the annular groove of the movable cylinder (12). The movable cylinder (12) is set on the top of the positioning ring (3). Two trigger blocks (14) are fixedly connected to the outside of the movable cylinder (12).

4. The rubber tube shaping mandrel structure according to claim 3, characterized in that, The self-cutting assembly is provided with two positioning rings (8), and a trigger post (9) is inserted into each positioning ring (8). A fixed frame (7) is fixedly connected to the outside of the processing cylinder (6). A bearing post (16) is fixedly connected to each fixed frame (7). A movable frame (29) is movably connected to the outside of the bearing post (16). A fixed post (15) is fixedly connected to each trigger post (9). The outside of the fixed post (15) is movably connected to the movable frame (29). A connecting post (17) is movably connected to the end of each movable frame (29) away from the fixed post (15).

5. The rubber tube shaping mandrel structure according to claim 4, characterized in that, The self-cutting assembly also includes a positioning shell (27), which is fixedly connected to the bottom of the processing cylinder (6). The outer side of the positioning shell (27) is provided with two placement holes for placing positioning rods (19). A positioning rod (19) is inserted into each of the two placement holes of the positioning shell (27). Two mating blocks (20) are both set inside the positioning shell (27). Each mating block (20) is fixedly connected to the corresponding positioning rod (19). A cutting ring (21) is fixedly connected to each mating block (20). A bearing rod (18) is fixedly connected to the opposite end of each positioning rod (19) away from the mating block (20). The end of each bearing rod (18) away from the positioning rod (19) is movably connected to the connecting column (17).

6. The rubber tube shaping mandrel structure according to claim 5, characterized in that, The bottom of the positioning shell (27) is fixedly connected to two movable frames (29). The bottom of each movable frame (29) is fixedly connected to a movable shell (22). The inside of each movable shell (22) is fixedly connected to a limiting post (23). The outside of the limiting post (23) is movably connected to a movable block (25). The top of the movable block (25) is fixedly connected to a connecting block (26). Each connecting block (26) is fixedly connected to the corresponding bearing rod (18). The outside of each limiting post (23) is fitted with a spring (24). The two ends of the spring (24) are fixedly connected to the inner wall of the corresponding movable shell (22) and the movable block (25) respectively. The movable shell (22) is provided with an elongated hole for the movement of the connecting block (26). The connecting block (26) is inserted into the elongated hole of the movable shell (22).

7. The rubber tube shaping mandrel structure according to claim 2, characterized in that, Both trigger blocks (14) are inclined triangular in shape, and the two trigger blocks (14) are distributed on the outside of the movable cylinder (12). When the movable cylinder (12) moves the trigger block (14) to the position of the corresponding trigger post (9), the trigger block (14) and the trigger post (9) are in contact.

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