A vulcanization device for large-diameter rubber-wound hoses and its usage method

Abstract

The present invention discloses a vulcanizing device for a large-diameter rubber-wound hose and a using method. The device comprises a vulcanizing box, a track, a transport vehicle, a mandrel, and a control box. The inside of the vulcanizing box is partitioned into three independent hot ovens by two partitions. A semi-circular groove is provided in the middle of each partition. The track is arranged below the vulcanizing box. The transport vehicle is arranged on the track. The circular mandrel is placed in a semi-circular bracket on the transport vehicle. A heating pipe is arranged inside the mandrel. The structure of the present invention is novel and practical, and the method is scientific. Vulcanization is carried out in three temperature stages, with the temperature gradually increasing and finally reaching the state of perfect vulcanization. There are two heating processes, so that the strip blank is evenly heated and the vulcanization effect is good. When the strip blank is heated during vulcanization, the air bubbles expand, and the rubber hose is extruded downward by the partition, and the air bubbles in between will escape, resulting in high working efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of rubber materials, and particularly relates to a vulcanizing device for large-diameter rubber winding hoses and a using method thereof. Background Art

[0002] At present, large-diameter rubber winding hoses are widely used in the petroleum and chemical industries due to their good heat resistance, and are applied to the production and manufacturing of onshore oil, gas, and water gathering pipelines, high-pressure water injection pipelines, hot washing pipelines, and offshore oil production risers. The diameter of the large-diameter rubber winding hoses generally reaches 200-500 mm, and the overall structure is divided into an inner layer tube, a reinforcing layer, and an outer protective layer. Both the inner layer tube and the outer protective layer are vulcanized. Due to the large diameter of the rubber hose, bubbles or cracks will appear in the inner and outer layers after vulcanization by the existing process. The reason is that the local temperature is too high during the vulcanization stage or the inner and outer parts of the rubber tube are unevenly heated during vulcanization, so that bubbles or crack defects are likely to occur in the bending area of the rubber hose, resulting in the inability of the hose to meet the customer requirements in terms of function and durability. Therefore, it is crucial to invent a scientific and practical vulcanizing device and vulcanization process. Summary of the Invention

[0003] To solve the above problems, the invention discloses a vulcanizing device for large-diameter rubber winding hoses and a using method thereof. The structure is novel and practical, the method is scientific, vulcanization is carried out in three temperature sections, the heating is uniform, and the air wrapped between the outer rubber tube and the winding layer can run out in time by adopting the process of arc extrusion at the junction, and the working efficiency is high.

[0004] To achieve the above object, the technical solution of the invention is as follows:

[0005] A vulcanizing device for large-diameter rubber winding hoses, comprising a vulcanizing box, a track, a transport vehicle, a mandrel, and a control box. The vulcanizing box is divided into three independent hot ovens by two partitions. All three hot ovens are externally connected with high-temperature inlet pipes, and temperature gauges and solenoid valves are provided on the high-temperature inlet pipes. Exhaust pipes are provided on all three hot ovens. Each partition is divided into upper and lower sections, and there is a gap between the upper section and the lower section of the partition. The upper section of the partition is connected to the upper cylinder. A semi-circular groove is provided below the upper section of the partition, and a bracket groove is provided above the lower section of the partition. Semi-circular pressing rollers with the same diameter are provided on both sides of the semi-circular groove. Rubber baffles are provided on both sides of the vulcanizing box, and a straight seam is provided below the vulcanizing box. The track is arranged below the vulcanizing box, the transport vehicle is arranged on the track, a traveling motor is provided on the side of the transport vehicle, a vertical support rod is provided on the transport vehicle, the support rod passes through the straight seam, and a semi-circular bracket is provided above the support rod. The circular mandrel is placed in the semi-circular bracket. A heating pipe is provided inside the mandrel. The control box is arranged outside the vulcanizing box, and the cylinder, the traveling motor, the solenoid valve are connected to the control box.

[0006] Further, the size of the bracket groove is larger than the size of the semi-circular bracket.

[0007] Further, the pressure inside the vulcanization box is controlled at 0.9 - 1.2 MPa.

[0008] Further, a control valve is provided on the exhaust pipe.

[0009] Further, the traveling motor is a servo motor.

[0010] The vulcanization method of the large - diameter rubber - wound hose vulcanization device of the present invention includes the following steps:

[0011] Step (1): Outer - layer vulcanization

[0012] (1) Prepare a pre - formed large - diameter rubber - wound hose strip blank;

[0013] (2) Coat the surface of the mandrel with a release agent, put the strip blank described in step (1) on the mandrel, and place it in the semi - circular bracket;

[0014] (3) Start the cylinder to drive the upper part of the partition to descend, so that the height difference between the height of the semi - circular groove below the partition and the highest point of the strip blank in step (2) ≤ the thickness of the strip blank;

[0015] (4) Start heating the mandrel to 150 - 160 °C, open the solenoid valve, input steam into the three hot ovens, the temperature in the first hot oven is 180 °C, the temperature in the second hot oven is 190 °C, and the temperature in the third hot oven is 200 °C;

[0016] (5) Start the traveling motor, move the transport vehicle forward, and the residence time in each hot oven is 6 - 7 min. The strip blank moves from the first hot oven to the second hot oven in 1 min, and so on;

[0017] Step (2): Inner - layer vulcanization

[0018] (6) Wait until the strip blank is completely removed from the vulcanization box, cool it down to below 50 °C, remove the strip blank from the mandrel, turn the strip blank over so that the inner layer faces outwards;

[0019] (7) Coat the surface of the mandrel with a release agent, turn the strip blank in step (6) by 180 °, put it on the mandrel, and place it in the semi - circular bracket;

[0020] (8) Move the transport vehicle backward, heat the mandrel to 120 - 130 °C, the temperature in the first hot oven is 140 °C, the temperature in the second hot oven is 150 °C, and the temperature in the third hot oven is 170 °C. The residence time in each hot oven is 6 - 7 min. The strip blank moves from the third hot oven to the second hot oven in 1 min, and so on;

[0021] After all the strip blanks such as (9) are removed from the vulcanizing box, the upper section of the partition plate rises, the solenoid valve is closed, the exhaust pipe is opened, and after the temperature drops to room temperature, the pipe blank is taken out to obtain the finished rubber hose.

[0022] The beneficial effects of the present invention are as follows:

[0023] The present invention discloses a vulcanizing device and a using method for large-diameter rubber winding hoses, with novel and practical structure, scientific method, vulcanization is carried out in three temperature sections, the temperature gradually rises, and finally reaches the state of perfect vulcanization; there are two heating processes, the strip blanks are evenly heated, and the vulcanization effect is good; when the strip blanks are heated during vulcanization, the air bubbles expand, and the partition plate is used to squeeze the rubber hose downward, and the air bubbles in between will run out, with high working efficiency. Description of the Drawings

[0024] Figure 1 It is a schematic structural diagram of the present invention.

[0025] Figure 2 It is a schematic diagram of the partition plate described in the present invention.

[0026] Figure 3 It is a schematic diagram of the strip blank passing through the upper section of the partition plate after being pressed downward described in the present invention.

[0027] Figure 4 It is a schematic diagram of the transport vehicle described in the present invention. Detailed Embodiments

[0028] The following further clarifies the present invention in conjunction with the drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and not to limit the scope of the present invention.

[0029] As shown in the figure, the large-diameter rubber winding hose vulcanizing device described in the present invention includes a vulcanizing box 1, a track 2, a transport vehicle 3, a mandrel 4, and a control box 5. The vulcanizing box 1 is divided into three independent hot drying ovens 7 by two partition plates 6. All three hot drying ovens 7 are externally connected to a high-temperature inlet pipe 8. A thermometer 9 and a solenoid valve 10 are provided on the high-temperature inlet pipe 8. Exhaust pipes 11 are provided on all three hot drying ovens. Each partition plate is divided into upper and lower sections. The upper section 12 of the partition plate is connected to the cylinder 14 above. A semi-circular groove 15 is provided below the upper section 12 of the partition plate, and a bracket groove 16 is provided above the lower section 13 of the partition plate. Semi-circular pressing rollers 17 with the same diameter are provided on both sides of the semi-circular groove 15. Rubber baffles are provided on both sides of the vulcanizing box 1, and a straight seam 18 is provided below the vulcanizing box 1. The track 2 is arranged below the vulcanizing box, the transport vehicle 3 is arranged on the track 2, a traveling motor 21 is provided on the side of the transport vehicle 3, a vertical support rod 19 is provided on the transport vehicle 3, the support rod 19 passes through the straight seam 18, and a semi-circular bracket 20 is provided above the support rod 19. The circular mandrel 4 is placed in the semi-circular bracket 20. A heating pipe is provided inside the mandrel 4. The control box 5 is arranged outside the vulcanizing box 1. The cylinder 14, the traveling motor 21, the solenoid valve 10 are connected to the control box 5.

[0030] The vulcanization method of the large-diameter rubber-wound hose vulcanization device described in the present invention includes the following steps:

[0031] Step (1): Outer layer vulcanization

[0032] (1) Prepare a preformed large-diameter rubber-wound hose blank 22;

[0033] (2) Apply a release agent on the surface of the mandrel 4, put the blank 22 described in step (1) on the mandrel 4, and place it in the semi-circular bracket 20. The semi-circular bracket 20 is made of steel bars and has a small contact area with the blank, which does not affect the vulcanization of the contact part;

[0034] (3) Start the cylinder 14 to drive the upper part of the partition 12 to descend, so that the height difference between the height of the semi-circular groove 15 below the partition and the highest point of the blank after step (2) ≤ the thickness of the blank;

[0035] (4) Start heating the mandrel 4 to 150 - 160 °C (internal preheating), open the solenoid valve, and input steam into the three hot ovens 7. The temperature in the first hot oven is 180 °C, the temperature in the second hot oven is 190 °C, and the temperature in the third hot oven is 200 °C.

[0036] (5) Start the traveling motor 21, and the transport vehicle 3 moves forward. The residence time in each hot oven is 6 - 7 minutes. It takes 1 minute for the blank to move from the first hot oven to the second hot oven, and so on. During the forward movement of the transport vehicle 3, the semi-circular groove 15 and the semi-circular pressing rollers 17 with the same diameter on both sides press the upper part of the blank outside the mandrel, and squeeze out the air bubbles in the upper half of the blank (because when the blank is vulcanized and heated, the hidden air bubbles inside expand, and by squeezing the rubber hose downward with the partition, the air bubbles in between will run out, and the squeezing efficiency is high);

[0037] Step (2): Inner layer vulcanization

[0038] (6) Wait until the entire blank 22 is removed from the vulcanization box 1 and cooled to below 50 °C, remove the blank 22 from the mandrel 4, turn the blank 4 over so that the inner layer faces outward.

[0039] (7) Apply a release agent on the surface of the mandrel, turn the blank 22 in step (6) by 180 °, put it on the mandrel 4, and place it in the semi-circular bracket 20;

[0040] (8) The transport vehicle 3 moves backward, the mandrel is heated to 120 - 130 °C, the temperature in the first hot oven is 140 °C, the temperature in the second hot oven is 150 °C, and the temperature in the third hot oven is 170 °C. The residence time in each hot oven is 6 - 7 minutes. It takes 1 minute for the blank to move from the third hot oven to the second hot oven, and so on;

[0041] After all of the strip blanks 22 are removed from the vulcanization box 1, the upper section 12 of the partition plate is raised, the solenoid valve 10 is closed, and the exhaust pipe 11 is opened. After the temperature drops to room temperature, the pipe blank is taken out to obtain the finished rubber hose.

[0042] The working principle of the vulcanization of the present invention is as follows: vulcanization is carried out in two heating stages. In the first stage, vulcanization is carried out through three temperature segments (180 °C, 190 °C, 200 °C), and the temperature gradually increases until the proper vulcanization is achieved. At the same time, the bubbles in the upper half of the strip blank are extruded. However, at this time, the inner layer of the strip blank has not been thoroughly vulcanized. After all, the large-diameter rubber-wound hose has a certain thickness, and there is also a winding layer in the middle, which is similar to the situation where the rice is a bit undercooked after being quickly boiled over high heat, or similar to the situation where a steel casting has just been taken out and has not been aged yet, with internal stress. Therefore, if it is used in this state, it will gradually crack. So, the present invention conducts the second vulcanization. The strip blank 4 is turned over so that the inner layer faces outward and is vulcanized again. At the same time, the strip blank 22 is rotated 180°, so that the original lower half of the strip blank becomes upward. When it is moved again, the bubbles in the lower half will be extruded. In addition, the temperature of the second vulcanization is also reduced, and the temperatures of the three hot ovens (170 °C, 150 °C, 140 °C) gradually decrease, which is similar to the situation where the rice is simmered for a while after being quickly boiled over high heat, or similar to the situation where a steel casting is quenched after being taken out, which can eliminate the internal stress, make the vulcanization thorough, ensure that the strip blank is evenly heated, and has a good vulcanization effect without cracking.

[0043] Although the present invention has been illustrated and described with respect to the preferred embodiments, those skilled in the art should understand that various changes and modifications can be made to the present invention as long as they do not exceed the scope defined by the claims of the present invention.

Claims

1. A vulcanization method for a vulcanization device of a large-diameter rubber-wound hose, characterized in that: It includes the following steps: Step (1): Outer layer vulcanization (1) Prepare a preformed large-diameter rubber winding hose blank; (2) Coat the surface of the mandrel with a release agent, put the blank described in step (1) on the mandrel, and place it in a semi-circular bracket; (3) Start the cylinder to drive the upper section of the partition to descend, so that the height difference between the height of the semi-circular groove below the partition and the highest point of the blank in step (2) ≤ the thickness of the blank; (4) Start heating the mandrel to 150 - 160 °C, open the solenoid valve, and input steam into three hot ovens. The temperature in the first hot oven is 180 °C, the temperature in the second hot oven is 190 °C, and the temperature in the third hot oven is 200 °C. (5) Start the traveling motor, move the transport vehicle forward, and the residence time in each hot oven is 6 - 7 minutes. It takes 1 minute for the blank to move from the first hot oven to the second hot oven, and so on; Step (2): Inner layer vulcanization (6) After all the blanks are removed from the vulcanization box and cooled to below 50 °C, remove the blank from the mandrel, turn the blank over with the inner layer facing outwards. (7) Coat the surface of the mandrel with a release agent, turn the blank in step (6) by 180 °, put it on the mandrel, and place it in a semi-circular bracket; (8) Move the transport vehicle backward, heat the mandrel to 120 - 130 °C, the temperature in the first hot oven is 140 °C, the temperature in the second hot oven is 150 °C, and the temperature in the third hot oven is 170 °C. The residence time in each hot oven is 6 - 7 minutes. It takes 1 minute for the blank to move from the third hot oven to the second hot oven, and so on; (9) After all the blanks are removed from the vulcanization box, raise the upper section of the partition, close the solenoid valve, open the exhaust pipe, and take out the pipe blank after it cools down to room temperature to obtain the finished rubber hose; Large-diameter rubber winding hose vulcanization device, including a vulcanization box, a track, a transport vehicle, a mandrel, and a control box. The vulcanization box is divided into three independent hot ovens by two partitions. All three hot ovens are externally connected to high-temperature inlet pipes. A solenoid valve is provided on the high-temperature inlet pipe. Exhaust pipes are provided on all three hot ovens. Each partition is divided into upper and lower sections. The upper section of the partition is connected to the cylinder above. A semi-circular groove is provided below the upper section of the partition. A bracket groove is provided above the lower section of the partition. Semi-circular pressing rollers with the same diameter are provided on both sides of the semi-circular groove. Rubber baffles are provided on both sides of the vulcanization box. A straight seam is provided below the vulcanization box. The track is arranged below the vulcanization box. The transport vehicle is arranged on the track. A traveling motor is provided on the side of the transport vehicle. A vertical support rod is provided on the transport vehicle. The support rod passes through the straight seam. A semi-circular bracket is provided above the support rod. The mandrel is placed in the semi-circular bracket. A heating pipe is provided inside the mandrel. The control box is arranged outside the vulcanization box. The cylinder, the traveling motor, and the solenoid valve are connected to the control box.

2. The vulcanization method of the large-diameter rubber-wound hose vulcanization device according to claim 1, characterized in that: A thermometer is provided on the high-temperature inlet pipe.

3. The vulcanization method of the large-diameter rubber-wound hose vulcanization device according to claim 1, characterized in that: A gap is provided between the upper section and the lower section of the partition.

4. The vulcanization method of the large-diameter rubber-wound hose vulcanization device according to claim 1, characterized in that: The size of the bracket groove is larger than the size of the semi-circular bracket.

5. The vulcanization method of the large-diameter rubber-wound hose vulcanization device according to claim 1, characterized in that: The pressure inside the vulcanization box is controlled at 0.9 - 1.2 MPa.

6. The vulcanization method of the large-diameter rubber-wound hose vulcanization device according to claim 1, characterized in that: A control valve is provided on the exhaust pipe.

7. The vulcanization method of the large-caliber rubber-wound hose vulcanization device according to claim 1, characterized in that: The traveling motor is a servo motor.

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