Annular blowout preventer rubber core pressure injection device and production and manufacturing method thereof

Abstract

The invention discloses an annular blowout preventer pressure injection device and a manufacturing method thereof.The annular blowout preventer pressure injection device comprises a base, a lower workbench, a mold system, a fixing table and a feeding system, the base and the fixing table are fixedly connected through a main supporting stand column, the mold system is arranged on the workbench and comprises an upper mold, a lower mold, a lower mold bottom plate and a framework positioning block, and the upper mold is provided with a pressure injection opening; the lower die is provided with an exhaust hole, the lower die bottom plate is located in the middle cavity, the framework positioning block is arranged on the step face of the upper end of the lower die, the feeding system is arranged on the fixing table and comprises a top plate, a feeder and a conveyor, the conveyor is installed on the top plate and provided with a one-way valve assembly, and a feeding port is formed in the side face of the conveyor. A through hole for axial movement of the conveyor is formed in the fixed table, and the detection control system is used for controlling and detecting the conveying variable of the whole device. A proper processing technology is formulated, bubbles can be effectively prevented from remaining in the rubber core, and the texture of the rubber core is uniform.

Description

Technical Field

[0001] The invention relates to the technical field of injection molds, and more specifically to an annular blowout preventer rubber core pressure injection and a production method thereof. Background Art

[0002] As the exploitation of oil and gas develops towards deep wells and ultra-deep wells, the safety and reliability of oil and gas development equipment are increasingly valued, the demand for high-pressure and ultra-high-pressure oil and gas well control equipment is becoming increasingly significant, and the performance and quality requirements for well control equipment are becoming increasingly higher. As an important well control equipment in the process of drilling, oil testing and other operations, the blowout preventer can achieve full sealing and semi-sealing functions. It is a wellhead device that can effectively control the flow direction of fluid in the well and can effectively control the occurrence of serious accidents such as blowouts. As a key component of the annular blowout preventer, the annular blowout preventer rubber core plays a vital role in preventing drilling blowouts and other accidents. It is usually made of support ribs and rubber vulcanization. During the working process, the rubber core is subjected to axial and radial pressure, which causes the rubber core rubber to be squeezed inward and drives the support ribs to hold the drill together or completely close the wellhead. The support ribs play a prominent role in enhancing the rubber core's anti-extrusion.

[0003] With the increasing pressure resistance requirements for BOPs, higher requirements are placed on the processing quality of the annular BOP rubber core. There are few reports on the production equipment of domestic annular BOP rubber cores. The existing annular BOP rubber core production equipment generally adopts stacking extrusion molding, adding a layer of rubber material and pressing it once, with many extrusion times. In the production process, bubbles are easily left inside the rubber core, and the material distribution is not easy to be uniform after the rubber core is formed, resulting in poor mechanical properties of the rubber core and uncontrollable production quality. Therefore, it is necessary to design a device that can effectively improve the production quality of the rubber core, formulate a suitable processing technology, and a production device that can effectively prevent bubbles from remaining in the rubber core and make the rubber core uniform in texture. Summary of the invention

[0004] In order to overcome the defects existing in the above-mentioned prior art, the present invention discloses a rubber core injection molding of an annular blowout preventer and a production method thereof. The present invention designs a device that can effectively improve the production quality of the rubber core and formulates a suitable processing technology that can effectively prevent residual bubbles in the rubber core and make the rubber core texture uniform.

[0005] In order to achieve the above objectives, the technical solution adopted by the present invention is: A rubber core injection device for an annular blowout preventer comprises, from bottom to top, a base, a lower workbench, a mold system, a fixed platform, and a feeding system. The base and the fixed platform are fixedly connected through a main supporting column. The mold system is arranged on the workbench, and comprises an upper mold, a lower mold, a lower mold bottom plate, and a skeleton positioning block. The upper end surface of the upper mold is provided with a rubber core material injection port, and the outer peripheral surface of the lower mold is provided with a plurality of exhaust holes. The lower mold bottom plate is arranged in a cavity generated in the middle when the upper mold and the lower mold are molded together. The outer peripheral surface of the lower mold bottom plate is in contact with the inner peripheral surface of the lower mold. The skeleton positioning block is arranged on the stepped surface at the upper end of the lower mold. The feeding system is arranged on a fixed platform, and includes a top plate, a feeder and a conveyor. The conveyor is vertically mounted on the top plate as a whole. A one-way valve assembly is arranged at the bottom of the conveyor. A feed port is opened on the side of the conveyor. The feeder transports the rubber material into the conveyor through the feed port. The fixed platform is provided with a through hole for the axial movement of the conveyor; It also includes a detection control system for controlling and detecting the conveying variables of the entire device.

[0006] Preferably, the feeding system also includes an electric heating module, which is arranged on the inner step surface of the fixed table through hole and surrounds the front end part of the conveyor insertion, and is used to heat the rubber material. The detection control system controls the heating temperature of the electric heating module by controlling the electric heating controller.

[0007] Preferably, the conveyor adopts a screw conveyor, including spiral blades, a conveying motor, a conveying core shaft and a conveying shell. The spiral blades are arranged around the conveying core shaft, and the conveying motor is installed at the upper end of the shell. The detection control system controls the speed of the conveying motor by controlling the servo controller.

[0008] Preferably, a temperature sensor is provided on the inner peripheral surface of the lower end of the fixing table, and the detection control system detects the temperature of the electric heating module using the temperature sensor.

[0009] Preferably, a pressure sensor is provided on the lower end surface of the fixed platform, and the detection control system detects pressure changes during the operation of the device through the pressure sensor.

[0010] Preferably, a feeding speed sensor is provided on the feeder, and the detection control system monitors the feeding speed by providing the feeding speed sensor.

[0011] Preferably, an exhaust valve is provided at each exhaust hole.

[0012] Preferably, a lower workbench hydraulic cylinder is provided between the base and the workbench, and the detection control system controls the axial movement of the lower workbench hydraulic cylinder by controlling the hydraulic control system and the lower workbench hydraulic cylinder solenoid valve to achieve compression between the mold and the fixed table.

[0013] Preferably, a top plate cylinder is provided between the top plate and the fixed table, and the detection control system controls the top plate cylinder by controlling the hydraulic control system and the top plate cylinder solenoid valve to move the conveyor along the axial direction of the through hole on the fixed table, thereby injecting the rubber material into the mold.

[0014] A method for manufacturing an annular blowout preventer rubber core by an annular blowout preventer rubber core injection device comprises the following steps: Step 1: Install the skeleton support ribs: The lower workbench hydraulic cylinder lowers the lower workbench to the lowest position through the hydraulic control system and the lower workbench hydraulic cylinder solenoid valve, installs the annular blowout preventer rubber core support ribs in the skeleton positioning block, and installs the upper mold on the lower mold; Step 2: Lift and press the mold: The lower workbench hydraulic cylinder lifts the lower workbench through the hydraulic control system and the lower workbench hydraulic cylinder solenoid valve to press the upper mold against the middle fixed table; Step 3: Heating and injecting the rubber material: The rubber material enters the conveyor housing through the feeder, and enters the injection cavity through the one-way valve assembly after being heated by the electric heating module. At the same time, the top plate cylinder moves axially through the control hydraulic control system and the top plate cylinder solenoid valve to remove the internal air and inject the heated rubber material into the mold; Step 4: Take out the rubber core: After injection is completed and cooled, lower the lower workbench, remove the upper mold and the lower mold respectively, and take out the annular blowout preventer rubber core.

[0015] Beneficial effects of the present invention: 1. Compared with the prior art, the conventional annular blowout preventer rubber core manufacturing equipment adopts stacking extrusion molding, adding a layer of rubber material and extruding once, with many extrusion times, and bubbles are easily left inside the rubber core during the manufacturing process, and the rubber core is unevenly distributed after molding. The present invention designs a complete set of high-reliability injection molding devices, which are provided with skeleton positioning blocks for installing skeleton support ribs of the annular blowout preventer rubber core, and exhaust holes and exhaust valves are provided on the outer peripheral surface of the lower mold, so that the air in the cavity can be discharged along the exhaust holes, effectively preventing the generation of bubbles during the injection molding process, and adopting one-time injection molding to make the rubber core texture uniform, thereby improving the quality of the rubber core.

[0016] 2. In the present invention, a complete set of production methods suitable for the injection molding device is also formulated. First, the skeleton support ribs are installed, and then the hydraulic cylinder lifts the mold to press the fixed table, and then the heated rubber material is injected. The last step is to take the rubber core. Compared with the traditional method of manufacturing the rubber core, this set of processes can not only ensure the processing quality of the rubber core, but also greatly reduce the scrap rate.

[0017] 3. In the present invention, a one-way valve assembly is provided at the bottom of the conveyor to ensure that the rubber material inside the conveyor can be smoothly conveyed to the mold. During injection molding, it can also ensure that the rubber material will not flow back into the conveyor, causing incomplete injection and affecting the molding effect.

[0018] 4. In the present invention, a control and detection system is provided to dynamically control and detect the conveying variables, and can control the axial movement of the top plate hydraulic cylinder and the lower workbench hydraulic cylinder, the temperature of the electric heating module, the feeding speed of the feeder, and the speed of the conveying motor. The data variables that do not meet the requirements can be modified, and the entire injection process can be optimized according to business needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a schematic diagram of the detection and control system of the present invention; Reference numerals: 1. Base; 2. Main support column; 3. Lower workbench hydraulic cylinder; 4. Lower workbench; 5. Lower mold base; 6. Lower mold; 7. Skeleton positioning block; 8. Upper mold; 9. Fixed table; 10. One-way valve assembly; 11. Electric heating module; 12. Top plate hydraulic cylinder; 13. Spiral blade; 14. Conveying mandrel; 15. Conveying shell; 16. Top plate; 17. Conveying motor; 18. Feeder; F01, exhaust valve; K01, detection control system; K02, hydraulic control system; K03, lower workbench hydraulic cylinder solenoid valve; K04, top plate hydraulic cylinder solenoid valve; K05, servo controller; K06, electric heating controller; C01, feeding speed sensor; C02, temperature sensor; C03, pressure sensor. DETAILED DESCRIPTION

[0020] The concept, specific structure and technical effects of the present invention will be clearly and completely described below in combination with the embodiments and drawings to fully understand the purpose, characteristics and effects of the present invention.

[0021] The present application provides an annular blowout preventer rubber core injection device, which comprises, from bottom to top, a base 1, a lower workbench 4, a mold system, a fixed platform 9, and a feeding system. The base 1 and the fixed platform 9 are fixedly connected by a main supporting column 2, preferably by bolt connection, which is more convenient to disassemble than other fixed connection methods.

[0022] The mold system is arranged on the lower workbench 4, and includes an upper mold 8, a lower mold 6, a lower mold bottom plate 5 and a skeleton positioning block 7. The upper end surface of the upper mold 8 is provided with a rubber core material injection port, and the rubber core material is injected into the mold cavity through the rubber core material injection port for forming. The outer peripheral surface of the lower mold 6 is provided with a plurality of exhaust holes. During injection, there is a lot of air in the mold cavity. In order to avoid bubbles inside the injection-molded blowout preventer rubber core, which causes a decrease in the quality of the rubber core, the internal air can be discharged from the exhaust holes. The lower mold bottom plate 5 is arranged in the mold cavity generated in the middle when the upper mold 8 and the lower mold 6 are molded together. The outer peripheral surface of the lower mold bottom plate 5 is in contact with the inner peripheral surface of the lower mold 6. The skeleton positioning block 7 is arranged on the upper step surface of the lower mold 6. According to the molding effect, the skeleton positioning block 7 can better position and inject the rubber core support ribs, and the quality is high.

[0023] The feeding system is arranged on a fixed platform, and comprises a top plate 16, a feeder 18 and a conveyor. The conveyor is vertically mounted on the top plate 16 as a whole. A one-way valve assembly 10 is arranged at the bottom of the conveyor to prevent the backflow of rubber material when the conveyor is pressed downward, thereby affecting the injection quality of the rubber core of the blowout preventer. A feeding port is provided on the side of the conveyor, and the feeder 18 feeds the rubber material into the conveyor through the feeding port.

[0024] The fixed table is provided with a through hole for the axial movement of the conveyor. The initial position of the front end of the conveyor is in a state of being inserted into the through hole. The outer surface of the conveyor and the inner surface of the through hole are in contact with each other. During injection molding, the front end of the conveyor can move axially in the through hole to the bottom of the through hole, and the rubber material in the through hole is completely injected into the mold for molding.

[0025] It also includes the detection and control system K01, which controls and detects the conveying variables of the entire device, to achieve precise control of injection parameters, improve injection quality, and optimize the entire injection system.

[0026] The feeding system also includes an electric heating module 11, which is arranged on the inner step surface of the through hole of the fixed table 9 and surrounds the front end part of the conveyor insertion, and is used to heat the rubber material. The heated rubber material has better fluidity and can be better injection molded. The detection and control system K01 controls the heating temperature of the electric heating module 11 by controlling the electric heating controller K06, and can also optimize the heating process to achieve the optimal heating temperature and speed up the heating process.

[0027] The conveyor adopts a screw conveyor, which is a relatively mature technical solution, relatively stable and efficient. It includes a spiral blade 13, a conveying motor 17, a conveying core shaft 14 and a conveying shell 15. The spiral blade 13 is arranged around the conveying core shaft 14, and the conveying motor 17 is installed at the upper end of the conveying shell 15. The detection control system K01 controls the speed of the conveying motor 17 by controlling the servo controller K05, and the most suitable speed of the conveying motor 17 can be matched according to the feeding speed.

[0028] A temperature sensor C02 is provided on the inner peripheral surface of the lower end of the fixed table. The detection and control system K01 uses the temperature sensor C02 to detect the temperature of the electric heating module 11, effectively monitor the temperature of the rubber material, and change the injection process in real time to avoid the quality of the molded rubber core being affected by excessively high or low temperature.

[0029] A pressure sensor C03 is provided on the lower end surface of the fixed table 9. The detection control system K01 detects the pressure changes of the device operation through the pressure sensor C03. When the mold and the fixed table 9 are pressed against each other, the uneven pressing force may cause incomplete injection and residual injection material, thus failing to achieve the ideal effect. In order to achieve a better injection effect, it is necessary to monitor and control the pressure in real time.

[0030] A feeding speed sensor C01 is provided on the feeder 18. The detection control system K01 monitors the feeding speed by providing the feeding speed sensor C01. The feeding speed can be increased or decreased according to business needs, thereby changing the injection efficiency.

[0031] The exhaust holes are all provided with exhaust valves F01. The exhaust valves F01 are opened for exhaust during injection. When no injection is performed, the exhaust holes can be closed to prevent interference from external media and influence on the inside of the mold.

[0032] A lower workbench hydraulic cylinder 3 is provided between the base 1 and the workbench 4. The detection and control system K01 controls the upward axial movement of the lower workbench hydraulic cylinder 3 by controlling the hydraulic control system K02 and the lower workbench hydraulic cylinder solenoid valve K03, thereby realizing the compression between the mold and the fixed table 9. When taking out the rubber core, the lower workbench hydraulic cylinder is controlled to move downward, the upper and lower molds are removed, and the molded rubber core is taken out of the mold.

[0033] A top plate cylinder 12 is arranged between the top plate 16 and the fixed table 9. The detection and control system K01 controls the top plate cylinder 12 by controlling the hydraulic control system K02 and the top plate cylinder solenoid valve K04 to move the conveyor along the axial direction of the through hole on the fixed table 9 to the bottom of the through hole, inject the rubber material into the mold, and then control it to return to the initial position.

[0034] A method for manufacturing an annular blowout preventer rubber core by an annular blowout preventer rubber core injection device comprises the following steps: Step 1: Install the skeleton support ribs: The lower workbench hydraulic cylinder 3 lowers the lower workbench 4 to the lowest position through the hydraulic control system K02 and the lower workbench hydraulic cylinder solenoid valve K03, installs the annular blowout preventer rubber core support ribs in the skeleton positioning block 7, and installs the upper mold 8 on the lower mold 6; Step 2: Lift and press the mold: The lower workbench hydraulic cylinder 3 lifts the lower workbench 4 through the hydraulic control system K02 and the lower workbench hydraulic cylinder solenoid valve K03, so that the upper mold 8 and the middle fixed platform 9 are pressed tightly; Step 3: Heating and injecting the rubber material: The rubber material enters the conveyor housing 15 through the feeder 18, and enters the injection cavity through the one-way valve assembly 10 after being heated by the electric heating module 11. At the same time, the top plate cylinder 12 moves axially by controlling the hydraulic control system K02 and the top plate cylinder solenoid valve K04, and the internal air is removed to inject the heated rubber material into the mold; Step 4: Take out the rubber core: After injection is completed and cooled, lower the lower workbench 4, remove the upper mold 8 and the lower mold 6 respectively, and take out the annular blowout preventer rubber core.

[0035] A matching process flow is provided, and the production method can complete the production of the rubber core in a more efficient way.

[0036] The above is a specific description of the implementation mode of the present invention, but the present invention is not limited to the described embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention, and these equivalents or substitutions are all included in the scope defined by the claims of the present invention.

Claims

1. An annular blowout preventer rubber core injection device, comprising, from bottom to top, a base (1), a lower workbench (4), a mold system, a fixed platform (9), and a feeding system, wherein the base (1) and the fixed platform (4) are fixedly connected via a main support column (2), and characterized in that: The mold system is arranged on the lower workbench (4), and comprises an upper mold (8), a lower mold (6), a lower mold bottom plate (5) and a skeleton positioning block (7); the upper end surface of the upper mold (8) is provided with a rubber core material injection port; the outer peripheral surface of the lower mold (6) is provided with a plurality of exhaust holes; the lower mold bottom plate (5) is arranged in a mold cavity generated in the middle when the upper mold (8) and the lower mold (6) are molded together; the outer peripheral surface of the lower mold bottom plate (5) is in contact with the inner peripheral surface of the lower mold (6); and the skeleton positioning block (7) is arranged on the stepped surface at the upper end of the lower mold (6); The feeding system is arranged on a fixed platform (9), and comprises a top plate (16), a feeder (18) and a conveyor. The conveyor is vertically mounted on the top plate (16) as a whole. A one-way valve assembly (10) is arranged at the bottom of the conveyor. A feeder port is provided on the side of the conveyor. The feeder (18) feeds the rubber material into the interior of the conveyor through the feeder port. The fixed platform (9) is provided with a through hole for the axial movement of the conveyor; It also includes a detection and control system (K01) for controlling and detecting the conveying variables of the entire device.

2. The annular blowout preventer rubber core injection device according to claim 1 is characterized in that: The feeding system further comprises an electric heating module (11), which is arranged on the inner step surface of the through hole of the fixed platform (9) and surrounds the front end portion of the conveyor insertion, and is used to heat the rubber material. The detection control system (K01) controls the heating temperature of the electric heating module (11) by controlling the electric heating controller (K06).

3. The annular blowout preventer rubber core injection device according to claim 1 is characterized in that: The conveyor is a screw conveyor, comprising a screw blade (13), a conveying motor (17), a conveying core shaft (14) and a conveying shell (15), wherein the screw blade (13) is arranged around the conveying core shaft (14), the conveying motor (17) is installed at the upper end of the conveying shell (15), and the detection control system (K01) controls the rotation speed of the conveying motor (17) by controlling the servo controller (K05).

4. The annular blowout preventer rubber core injection device according to claim 1, characterized in that: A temperature sensor (C02) is provided on the inner peripheral surface of the lower end of the fixing table (9), and the detection control system (K01) uses the temperature sensor (C02) to detect the temperature of the electric heating module (11).

5. The annular blowout preventer rubber core injection device according to claim 1, characterized in that: A pressure sensor (C03) is provided on the lower end surface of the fixed platform (9), and the detection control system K01 detects pressure changes during the operation of the device through the pressure sensor.

6. The annular blowout preventer rubber core injection device according to claim 1, characterized in that: A feeding speed sensor (C01) is provided on the feeder (18), and the detection control system (K01) monitors the feeding speed by providing the feeding speed sensor (C01).

7. The annular blowout preventer rubber core injection device according to claim 1, characterized in that: Exhaust holes are all equipped with exhaust valves (F01).

8. The annular blowout preventer rubber core injection device according to claim 1, characterized in that: A lower workbench hydraulic cylinder (3) is provided between the base (1) and the lower workbench (4), and the detection control system (K01) controls the axial movement of the lower workbench hydraulic cylinder (3) by controlling the hydraulic control system (K02) and the lower workbench hydraulic cylinder electromagnetic valve (K03), thereby achieving compression between the mold system and the fixed platform (9).

9. The annular blowout preventer rubber core injection device according to claim 1, characterized in that: A top plate hydraulic cylinder (12) is provided between the top plate (16) and the fixed platform (9), and the detection control system (K01) controls the top plate hydraulic cylinder (12) by controlling the hydraulic control system (K02) and the top plate hydraulic cylinder electromagnetic valve (K04) to move the conveyor along the axial direction of the through hole on the fixed platform (9) to inject the rubber material into the mold.

10. A method for manufacturing an annular blowout preventer rubber core using the annular blowout preventer rubber core injection device according to any one of claims 1 to 9, characterized in that: The steps include: Step 1: Install the skeleton support ribs: The lower workbench hydraulic cylinder (3) lowers the lower workbench (4) to the lowest position through the hydraulic control system (K02) and the lower workbench hydraulic cylinder solenoid valve (K03), installs the annular blowout preventer rubber core support ribs in the skeleton positioning block (7), and installs the upper mold (8) on the lower mold (6); Step 2: Lifting and pressing the mold: The lower workbench hydraulic cylinder (3) lifts the lower workbench (4) through the hydraulic control system (K02) and the lower workbench hydraulic cylinder solenoid valve (K03), so that the upper mold (8) and the middle fixed platform (9) are pressed tightly; Step 3: Heating and injecting the rubber material: the rubber material enters the conveyor housing (15) through the feeder (18), is heated by the electric heating module (11), and then enters the injection cavity through the one-way valve assembly (10). At the same time, the top plate cylinder (12) moves axially by controlling the hydraulic control system (K02) and the top plate cylinder solenoid valve (K04), thereby removing the internal air and injecting the heated rubber material into the mold. Step 4: Take out the rubber core: After the injection is completed and cooled, lower the lower workbench (4), remove the upper mold (8) and the lower mold (6) respectively, and take out the annular blowout preventer rubber core.

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