Compact ram blowout preventer

Abstract

The compact type ram blowout preventer comprises a shell, and ram bodies which are opened and closed mutually are connected into the shell in a sliding mode; the side door is connected to the side end of the shell, a center hole is formed in the side door, and a through hole is formed in the side door; the hydraulic cylinder assembly is fixed to the side, away from the shell, of the side door. One end of a piston shaft in the hydraulic cylinder assembly penetrates through the center hole and is detachably connected with the gate plate body. The flashboard opening and closing display mechanism is fixed to the cylinder cover, a display rod used for displaying the opening and closing state of the flashboard is arranged on the flashboard opening and closing display mechanism, and the display rod and the piston shaft are coaxially arranged and slidably connected to the other end of the piston shaft; the connecting plate is rotationally connected to the shaft section of the cylinder cover, the side door opening and closing control mechanism penetrates through the through hole and is fixedly connected with the shell, a telescopic switch piston rod is arranged on the side door opening and closing control mechanism, one end of the connecting plate is detachably connected with the telescopic end of the switch piston rod, and an oil way for controlling the switch piston rod to move in a telescopic mode is arranged on the shell. Structural layout is reasonable, and use is safe and convenient.

Description

Technical Field

[0001] The invention relates to the technical field of drilling safety control equipment in the petroleum and natural gas industries, and in particular to a compact gate blowout preventer. Background Art

[0002] At present, in the domestic oil and gas field, ultra-deep well drilling operations are becoming more and more common, and there are more and more ultra-high pressure and high-yield wells. The risk of drilling operations is also getting higher and higher. Once the formation fluid loses control during the oil and gas drilling process, well slugging or even blowout may occur. Once a blowout occurs, normal drilling operations will be impossible and even the drilling equipment will be damaged, which will not only destroy oil and gas resources, but also pollute the natural environment and endanger the safety of drilling personnel and oil and gas wells. Blowout preventers are the most critical equipment for controlling wellhead pressure and preventing blowouts during drilling operations. With the continuous development of drilling technology, the blowout preventer equipment used in drilling rigs has been continuously upgraded to large-diameter and high-pressure. Due to the limitations of derrick space and hoisting equipment, higher requirements are placed on the size and weight of blowout preventers.

[0003] Due to the size and weight of the blowout preventer combination, some models of blowout preventer groups can no longer meet the requirements of existing drilling rigs, especially old drilling rigs. Some drilling companies have reduced the configuration of the blowout preventer group to reduce size and weight, which has brought hidden dangers to well control safety.

[0004] Chinese patent CN201810284156.5 discloses a locking gate blowout preventer, which solves the problem of time-consuming and laborious disassembly when opening the side door to replace parts, thereby improving work efficiency. However, it has no safety display function and does not have a safe and reliable effect, so that the operator cannot know the opening and closing status of the gate.

[0005] Therefore, how to provide a gate blowout preventer that is safe, reliable, easy to operate, relatively small in size, and light in weight is a problem that technical personnel in this field urgently need to solve. Summary of the invention

[0006] In view of this, the present invention provides a compact gate blowout preventer to solve the problems of large size, large weight and poor applicability of the gate blowout preventer in the prior art.

[0007] In order to achieve the above object, the present invention adopts the following technical solution: a compact gate blowout preventer, comprising:

[0008] A housing, wherein a gate body is slidably connected inside the housing and opens and closes mutually;

[0009] A side door, wherein the side door is connected to the side end of the housing through side door bolts, a center hole is provided on the side door, and a through hole is provided on one side edge of the side door;

[0010] A cylinder assembly, wherein the cylinder assembly is fixed to a side of the side door away from the housing by a connecting piece, and one end of a piston shaft in the cylinder assembly passes through the center hole and is detachably connected to the gate body;

[0011] A gate opening and closing display mechanism, wherein the gate opening and closing display mechanism is fixed to the cylinder head through a connecting piece, and a display rod for displaying the gate opening and closing state is provided on the gate opening and closing display mechanism, and the display rod is coaxially arranged with the piston shaft and slidably connected to the other end of the piston shaft;

[0012] A connecting plate, the connecting plate is rotatably connected to the shaft section of the cylinder head, and the gate opening and closing display mechanism limits the axial movement of the connecting plate on the shaft section;

[0013] A side door opening and closing control mechanism is arranged on one or more side door bolt connection positions, the side door opening and closing control mechanism passes through the through hole and is fixedly connected to the shell, a telescopic switch piston rod is provided on the side door opening and closing control mechanism, one end of the connecting plate is detachably connected to the telescopic end of the switch piston rod, and an oil circuit for controlling the telescopic movement of the switch piston rod is provided on the shell.

[0014] The beneficial effects of the present invention are as follows: a side door opening and closing control mechanism is provided, and the side door opening and closing control mechanism is arranged on one side of the side door, and is arranged on the side door bolt connection position, and can be integrated with the side door bolt for use, thereby reducing the layout space, and no additional space layout is required, and the size structure is optimized. When the side door needs to be opened to replace internal parts, the side door opening and closing control mechanism is used to open the side door, thereby reducing the labor intensity of workers, and the operation is simple and convenient. The gate opening and closing safety status is displayed by the gate opening and closing display mechanism, and when used in conjunction with the piston shaft, the display rod can be embedded in the piston shaft hole, thereby reducing the length of the gate opening and closing display mechanism, and realizing a compact design of the overall structure. The device has a reasonable structural design, a compact layout, and a small size. It uses a hydraulic control method, is easy to operate, and is effective when applied to large-diameter and high-pressure gate blowout preventers.

[0015] Preferably, the cylinder body of the hydraulic cylinder assembly is connected to the side of the side door away from the shell by bolts, the piston shaft is slidably connected in the cylinder body, a piston disk is fixed to the middle part of the piston shaft, and the cylinder cover is fixed to the end surface of the cylinder body away from the side door by bolts, and an opening cavity and a closing cavity are formed inside the cylinder body and on both sides of the corresponding piston disk, the opening cavity is arranged close to one side of the shell, and the closing cavity is arranged away from the side of the shell, one end of the piston shaft is horizontally provided with a T-shaped hook for disassembling the gate body, and the other end of the piston shaft is provided with a countersunk hole, and a blind hole is provided on the bottom wall of the countersunk hole.

[0016] The resulting technical effect is: the piston shaft is detachably connected to the gate body using a horizontal T-hook, the axial movement of the piston shaft controls the opening and closing of the gate body, and countersunk holes and blind holes are provided on the piston shaft to facilitate the embedding of the display rod to shorten the size of the overall structure.

[0017] Preferably, an axial hole for the other end of the avoidance piston shaft is provided on the axial section of the cylinder cover, and the other end of the piston shaft can extend into the axial hole. A mounting hole matching the connection to the axial section is provided on the connecting plate. Slot holes matching the connection to the switch piston rod are provided on the edges at both ends of the connecting plate. The gate opening and closing display mechanism is connected to the end of the axial section.

[0018] The resulting technical effect is: the shaft section on the cylinder head is used to achieve connection with the connecting plate, the connecting plate can rotate, and when in use, it is sufficient to establish contact with the side door opening and closing control mechanism, and the connecting plate will not affect the use of the gate opening and closing display mechanism.

[0019] Preferably, the gate opening and closing display mechanism includes a pressure cover, an end cover, an opening piston, and a display rod. The end cover is fixed on the pressure cover and the end cover and the pressure cover are fixedly connected to the end face of the shaft segment by end cover screws. The pressure cover limits the axial movement of the connecting plate on the shaft segment. The pressure cover and the end cover are coaxially provided with holes for the opening piston to slide. The opening piston is dynamically sealed and connected to the holes on the corresponding pressure cover and end cover. One end of the display rod is slidably connected in the blind hole. The display rod is dynamically sealed and slidably connected in the inner hole of the opening piston and the other end of the display rod can extend out of the end of the opening piston.

[0020] The resulting technical effect is that the gate opening and closing display mechanism is used to display the gate opening and closing status to improve safety during operation. In addition, the display rod can be hidden in the blind hole on the piston shaft, which is convenient for embedding the display rod to shorten the overall structural size.

[0021] Preferably, a limiting portion is provided at one end of the display rod, and the limiting portion is slidably connected in the blind hole, and a ring block for limiting the axial movement of the limiting portion is fixedly connected in the countersunk hole, and a first outer protrusion and a second outer protrusion are provided on the display rod and at an axial interval corresponding to the display rod, the first outer protrusion is arranged close to one side of the piston shaft, and the second outer protrusion is arranged close to one side of the opening piston, the first outer protrusion and the second outer protrusion are located between the ring block and the opening piston, and a display block is fixed to the other end of the display rod.

[0022] The technical effect produced thereby is that the movement of one end of the display rod in the blind hole of the piston shaft is limited by stroke, and the opening piston can cause the display rod to withdraw through the second outer protrusion, and the end of the withdrawn stroke is limited by the first outer protrusion and the ring block.

[0023] Preferably, the opening piston is a stepped cylinder structure, and a plurality of sealing grooves are arranged on the outer wall of the piston disk of the opening piston, and a cavity hole for cooperating with the sliding movement of the piston disk is arranged on the inner side of the end cover, and the outer peripheral side wall of the piston disk is dynamically sealed with the inner wall of the cavity hole, and a step is arranged on the middle part of the inner wall of the opening piston, and a plurality of annular grooves for dynamically sealing and connecting the display rod are arranged on the inner hole wall of the step, and a plurality of oil passage holes for connecting the inside and outside of the opening piston are obliquely arranged on the side wall of the opening piston close to the piston disk, and the oil inside the opening piston enters the cavity hole through the oil passage hole and prompts the opening piston to move, and the second outer protrusion abuts against the step to limit the position.

[0024] The technical effect produced thereby is that the opening piston can communicate with the inner and outer chambers under the action of the oil passage hole, and the oil passage hole on the opening piston is the key to promoting the movement of the opening piston. The sealing ring groove and the ring groove are used in conjunction with the sealing rubber ring.

[0025] Preferably, the side door opening and closing control mechanism includes a switch cylinder stud, an oil nozzle, an oil plug, a switch piston rod, a pressing sleeve and a side door nut. The switch cylinder stud is a cylindrical structure and has external threaded connection parts at both ends. One end of the switch cylinder stud passes through the through hole and is connected to the shell. The oil nozzle is fixed on the inner side of one end of the switch cylinder stud and is used to connect the oil circuit on the shell. The oil plug is a plug with a hole, which is threadedly connected to the inner side of the other end of the switch cylinder stud, and the side door nut is threadedly connected to the outer side of the other end of the switch cylinder stud. The pressing sleeve is slidably located on the outer side of the switch cylinder stud, one end of the pressing sleeve abuts against the side door, and the other end abuts against the side door nut for limiting position. The switch piston rod is slidably connected in the switch cylinder stud, and one end of the switch piston rod passes through the oil plug and the side door nut to be connected to the slot on the connecting plate.

[0026] The resulting technical effect is: the side door opening and closing control mechanism is controlled by the control oil circuit, and the outer side wall of the switch cylinder stud is slidably connected to the through hole on the side door, so that when the switch piston rod moves with the cylinder body and the side door, it will not affect the normal use of the switch cylinder stud, and it also serves as a guide rod to guide the movement of the side door.

[0027] Preferably, both side end faces of the shell are provided with a plurality of connecting threaded holes, wherein one connecting threaded hole or a plurality of connecting threaded holes are connected to a plurality of hydraulic oil circuit holes on the shell, and a positioning step for cooperating with the installation of the switch cylinder stud is provided in the connecting threaded hole corresponding to the hydraulic oil circuit hole.

[0028] The technical effect produced by this is: the connection between the side door and the shell is achieved through multiple connecting threaded holes, one of the connecting threaded holes or multiple connecting threaded holes is connected to a hydraulic oil circuit that controls the operation of the side door opening and closing control mechanism, and one set of side door opening and closing control mechanisms or multiple sets of mechanisms can be used to control the opening of the side door.

[0029] Preferably, the slot on the connecting plate is arranged to be rotated 180° relative to the center of the connecting plate, the slot is a U-shaped slot or a circular through hole with an opening on one side, the telescopic end of the switch piston rod is provided with a limiting step for fitting and fixing the connecting plate, and the telescopic end of the switch piston rod is fixed to the connecting plate using a fixing nut.

[0030] The resulting technical effect is that the switch piston rod achieves synchronous movement with the cylinder cover, cylinder body and side door through the connecting plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 An exploded view of a compact gate blowout preventer according to the present invention with a side door in an open state;

[0032] Figure 2 for Figure 1 Assembly drawing of

[0033] Figure 3 An exploded view of a gate opening and closing display mechanism of a compact gate blowout preventer of the present invention;

[0034] Figure 4 A schematic diagram of a housing of a compact gate blowout preventer of the present invention;

[0035] Figure 5 This is a piston shaft structure diagram of a compact gate blowout preventer of the present invention;

[0036] Figure 6 This is a structural diagram of a connecting plate of a compact gate blowout preventer of the present invention;

[0037] Figure 7 A structural diagram of a switch cylinder stud of a compact gate blowout preventer of the present invention;

[0038] Figure 8 A structural diagram of a display rod of a compact gate blowout preventer according to the present invention;

[0039] Fig. 9 This is a structural diagram of an opening piston of a compact gate blowout preventer of the present invention;

[0040] Fig.10 A gate closing state diagram of a compact gate blowout preventer of the present invention;

[0041] Fig.11 A diagram showing a compact gate blowout preventer in an open state;

[0042] Fig.12 A diagram showing a side door opening state of a compact gate blowout preventer according to the present invention;

[0043] Fig.13A diagram showing a side door of a compact gate blowout preventer according to the present invention in a closed state;

[0044] Fig.14 This is a diagram showing the gate opening and closing structure coordination of a compact gate blowout preventer according to the present invention.

[0045] 1 housing, 2 gate body, 3 side door, 4 piston shaft, 5 cylinder body, 6 cylinder head, 7 side door opening and closing control mechanism, 8 gate opening and closing display mechanism, 9 side door bolts, 10 side door studs, 11 side door nuts, 12 screws, 13 connecting plates, 14 fixing nuts;

[0046] 101 connecting threaded hole, 102 positioning step, 103 hydraulic oil circuit hole;

[0047] 401 piston plate, 402 T-hook, 403 blind hole, 404 countersunk hole, 405 screw hole;

[0048] 701 oil nozzle, 702 switch cylinder stud, 703 oil plug, 704 compression sleeve, 705 switch piston rod;

[0049] 7021 external thread connection, 7022 positioning shoulder, 7023 internal thread, 7024 external square, 7025 positioning sinker;

[0050] 801 gland, 802 end cover, 803 opening piston, 804 display rod, 805 display block, 806 end cover screw, 807 ring block;

[0051] 8021 cavity;

[0052] 8031 sealing groove, 8032 ring groove, 8033 step, 8034 oil hole, 8035 display block inlay countersunk hole;

[0053] 8041 is a limiting portion, 8042 is a first outer protrusion, 8043 is a second outer protrusion, and 8044 is a display block connecting hole; 1301 is a mounting hole, and 1302 is a slot hole. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0055] See the attached Figures 1 to 14 According to an embodiment of the present invention, a compact gate blowout preventer comprises:

[0056] A housing 1, wherein a gate body 2 is slidably connected to the housing 1 and opens and closes mutually;

[0057] A side door 3, which is connected to the side end of the housing 1 through a side door bolt 9, a center hole is provided on the side door 3, and a through hole is provided on one side edge of the side door 3;

[0058] The cylinder assembly is fixed to the side of the side door 3 away from the housing 1 by a connecting piece, and the connecting piece includes a side door bolt 9, a side door stud 10, a side door nut 11, etc. One end of the piston shaft 4 in the cylinder assembly passes through the center hole and is detachably connected to the gate body 2;

[0059] The gate opening and closing display mechanism 8 is fixed to the cylinder cover 6 through a connecting piece. The gate opening and closing display mechanism 8 is provided with a display rod 804 for displaying the gate opening and closing state. The display rod 804 is coaxially arranged with the piston shaft 4 and slidably connected to the other end of the piston shaft 4.

[0060] A connecting plate 13, the connecting plate 13 is rotatably connected to the shaft section of the cylinder head 6, and the gate opening and closing display mechanism 8 limits the axial movement of the connecting plate 13 on the shaft section;

[0061] The side door opening and closing control mechanism 7 can be arranged in two groups diagonally or in parallel at one side end of the side door, so that the side door can be opened more stably. The side door opening and closing control mechanism 7 passes through the through hole and is fixedly connected to the shell 1. The side door opening and closing control mechanism 7 is arranged at the connection position of the original side door stud to realize the integration of the structure and the side door bolts. The side door opening and closing control mechanism can also play the connecting effect of the side door bolts. A telescopic switch piston rod 705 is provided on the side door opening and closing control mechanism 7, and one end of the connecting plate 13 is detachably connected to the telescopic end of the switch piston rod 705. An oil circuit for controlling the telescopic movement of the switch piston rod is provided on the shell 1.

[0062] The side doors and related components on both sides of the shell are symmetrically arranged to realize the opening and closing of the gate body or the opening of the side doors.

[0063] In other embodiments, the cylinder body 5 of the hydraulic cylinder assembly is connected to the side of the side door 3 away from the shell 1 by bolts, the piston shaft 4 is slidably connected in the cylinder body 5, a piston disk 401 is fixed to the middle of the piston shaft 4, and the cylinder cover 6 is fixed to the end face of the cylinder body 5 away from the side door 3 by screws 12. An open cavity and a closed cavity that are not connected to each other are formed inside the cylinder body 5 and on both sides of the corresponding piston disk 401. The open cavity is arranged close to the side of the shell 1, and the closed cavity is arranged away from the side of the shell 1. One end of the piston shaft 4 is horizontally provided with a T-shaped hook 402 for disassembling and connecting the gate body 2, and the other end of the piston shaft 4 is provided with a countersunk hole 404, and a blind hole 403 is provided on the bottom wall of the countersunk hole 404. A plurality of screw holes 405 are provided on the peripheral side of the bottom wall of the countersunk hole for bolting the ring block 807.

[0064] In other specific embodiments, an axial hole for the other end of the avoidance piston shaft 4 is provided on the axial section of the cylinder head 6, and the other end of the piston shaft 4 can be inserted into the axial hole. A mounting hole 1301 that matches the connection with the axial section is provided on the connecting plate 13. The connecting plate 13 matches with the axial hole of the cylinder head 6. The edges of both ends of the connecting plate 13 are provided with slots 1302 that match the connection with the switch piston rod 705, and the gate opening and closing display mechanism 8 is connected to the end of the axial section.

[0065] In some other embodiments, the gate opening and closing display mechanism 8 includes a pressure cover 801, an end cover 802, an opening piston 803, and a display rod 804. The end cover 802 is fixed on the pressure cover 801 and the end cover and the pressure cover are fixedly connected to the end face of the shaft section by an end cover screw 806. The pressure cover 801 is also used to limit the axial movement of the connecting plate 13 on the shaft section, so that the cylinder body and the side door can be moved as a whole through the connecting plate 13. The pressure cover 801 and the end cover 802 are coaxially provided with a hole for the opening piston 803 to slide. The opening piston 803 is dynamically sealed and connected to the corresponding hole on the pressure cover and the end cover using a sealing ring. One end of the display rod 804 is slidably connected in the blind hole 403, and the display rod 804 is dynamically sealed and slidably connected in the inner hole of the opening piston 803 and the other end of the display rod can extend out of the end of the opening piston 803.

[0066] In some other specific embodiments, a limiting portion 8041 is provided at one end of the display rod 804, and the limiting portion 8041 is slidably connected in the blind hole 403. A ring block 807 for limiting the axial movement stroke of the limiting portion 8041 is fixedly connected in the countersunk hole 404. The ring block is a split structure and is fixed in the countersunk hole 404 by the cooperation of bolts and screw holes 405. A first outer protrusion 8042 and a second outer protrusion 8043 are provided on the countersunk display rod 804 and corresponding to the axial interval of the display rod. The first outer protrusion 8042 is arranged close to one side of the piston shaft 4, and the second outer protrusion 8043 is arranged close to one side of the opening piston 803. The first outer protrusion 8042 and the second outer protrusion 8043 are located between the ring block 807 and the opening piston 803. A display block 805 is fixed to the other end of the display rod 804, and a display block connecting hole 8044 for matching with the display block 805 is provided at the other end of the display rod.

[0067] In other specific embodiments, the opening piston 803 is a stepped cylinder structure, and a plurality of sealing grooves 8031 ​​are arranged on the outer wall of the piston disk of the opening piston 803, and a cavity 8021 for cooperating with the sliding of the piston disk is arranged on the inner side of the end cover 802, and a chamber is formed between the outer wall of the opening piston, the end cover and the inner wall of the cavity, and the outer peripheral side wall of the piston disk is dynamically sealed with the inner wall of the cavity by a sealing ring, and a step 8033 is arranged on the middle part of the inner wall of the opening piston 803, and a plurality of annular grooves 8032 for dynamically sealing and connecting the display rod are arranged on the inner hole wall of the step 8033, which are specifically connected by a rubber ring seal, and a plurality of oil holes 8034 for connecting the inside and outside of the opening piston 803 are inclinedly arranged on the side wall of the opening piston 803 close to the piston disk, and the oil inside the opening piston 803 enters the chamber through the oil hole 8034 and prompts the opening piston to move, and the second outer protrusion 8043 abuts against the step 8033 to limit the position.

[0068] In some other embodiments, the side door opening and closing control mechanism 7 includes a switch cylinder stud 702, an oil nozzle 701, an oil plug 703, a switch piston rod 705, a compression sleeve 704 and a side door nut 11. The switch cylinder stud 702 is a cylindrical structure and both ends thereof are provided with external threaded connection parts 7021. One end of the switch cylinder stud 702 passes through the through hole and is connected to the housing 1. A positioning shoulder 7022 is provided on the edge of one end of the switch cylinder stud 702, which is used in conjunction with the positioning step 102 on the threaded hole. The oil nozzle 701 is fixed to the inner side of one end of the switch cylinder stud 702 and is used to connect the oil circuit on the housing 1. The oil plug 703 is a plug with a hole. The oil plug 703 is threadedly connected to the inner side of the other end of the switch cylinder stud 702. The oil plug ensures that the switch piston When the rod dynamic seal slides, the high-pressure liquid in the switch cylinder stud is prevented from flowing out. The side door nut 11 is threadedly connected to the outside of the other end of the switch cylinder stud 702. The other end of the switch cylinder stud 702 is provided with an outer side 7024. The outer side 7024 and the external threaded connection part of the corresponding end are arranged to avoid interference. The outer side 7024 facilitates the connection between the switch cylinder stud 702 and the threaded hole of the housing 1. The pressing sleeve 704 slides on the outside of the switch cylinder stud 702. One end of the pressing sleeve 704 abuts on the side door 3, and the other end abuts against the side door nut 11 to limit the position. The switch piston rod 705 is slidably connected in the switch cylinder stud 702 and one end of the switch piston rod passes through the oil plug 703 and the side door nut 11 and is connected to the slot 1302 on the connecting plate 13. The switch. The inner side of the other end of the switch cylinder stud 702 is a positioning sink 7025 with a limited oil plug installation position.

[0069] In other embodiments, multiple connecting threaded holes 101 are provided on both side end faces of the housing 1, one or two of which are connected to multiple hydraulic oil circuit holes 103 on the housing 1, and corresponding connecting threaded holes are provided with positioning steps 102 for mounting the switch cylinder studs 702. Multiple connecting threaded holes for mounting the hydraulic oil circuit holes are provided to realize the oil circuit control of multiple sets of side door opening and closing control mechanisms.

[0070] In some other specific embodiments, the slot hole 1302 on the connecting plate 13 is arranged to be rotated 180° relative to the center of the connecting plate. The slot hole 1302 is a U-shaped slot hole or a circular through hole with one side open. The telescopic end of the switch piston rod 705 is provided with a limiting step for fixing the connecting plate. The telescopic end of the switch piston rod 705 is fixed to the connecting plate 13 using a fixing nut 14.

[0071] The working principle of the present invention is as follows:

[0072] The shell 1 and the side door 3 are fastened together by a plurality of side door studs 10: the side door opening and closing control structure 7 and the side door studs 10 are first installed in the corresponding screw holes on the shell 1 through threads. After the side door 3 is closed, the shell 1 and the side door 3 are fastened by installing the side door nuts 11 and the side door bolts 9.

[0073] Hydraulic opening of the side door 3: The premise for opening the side door is to release the restriction of the side door nut. High-pressure fluid is injected into the hydraulic oil circuit hole 103 on the housing 1. The high-pressure fluid enters the switch cylinder bolt 702 (corresponding to one end of the piston of the switch piston rod) through the oil nozzle 701. At this time, the switch piston rod 705 is pushed to move away from the housing 1. The switch piston rod 705 drives the cylinder cover 6 to move under the action of the connecting plate 13. Due to the fixed connection between the cylinder cover 6, the cylinder body 5 and the side door 3, the side door 3 moves away from the housing 1. Since the side door nut and the side door bolt 9 are released from the limit in advance, the side door can slide under the guidance of the side door stud to realize the opening of the side door 3. In the process of opening the side door, due to the sliding connection between the side door through hole and the outer wall of the switch cylinder stud 702, when the side door moves, the pressing sleeve 704 moves (the side door nut is released from the limit), but it will not affect the normal use of the switch cylinder stud 702, and its position remains unchanged.

[0074] Hydraulic closing of the side door 3: by injecting high-pressure fluid into the hydraulic oil circuit hole 103 on the housing 1 (corresponding to the other end of the switch piston rod piston), the high-pressure fluid will enter the rod side of the switch piston rod 705, pushing the switch piston rod 705 to move closer to the housing 1, and the switch piston rod 705 drives the connecting plate 13 to move, and the connecting plate 13 then drives the cylinder cover 6 and the cylinder body 5 to move, thereby making the side door 3 move closer to the housing 1, so as to achieve the closing of the side door 3, and then tighten the corresponding nuts and side door bolts.

[0075] The closed state of the piston shaft 4 is displayed: when the high-pressure fluid enters the closed cavity of the cylinder 5, the high-pressure fluid acts on the piston plate 401 and pushes the piston shaft 4 to move close to the housing 1. Under the action of the pressure difference, the high-pressure fluid in the gate display mechanism 8 will enter the cavity through the oil hole 8034 of the opening piston 803, thereby pushing the opening piston 803 to move close to the housing 1. At the same time, under the positioning of the second outer protrusion 8043, the opening piston 803 pushes the display rod 804 to move a certain stroke toward the housing until the opening piston 803 moves The piston shaft 4 continues to move towards the direction close to the housing 1, and the distance between the first outer protrusion 8042 of the display rod 804 and the ring block 807 gradually decreases until they fit together. With the cooperation of the ring block 807 and the limiting portion 8041, the piston shaft 4 will drive the display rod 804 to move further toward the housing until the piston shaft 4 is closed in place. At this time, the display block 805 completely enters the display block embedding countersunk hole 8035 of the opening piston 803, indicating that the piston shaft 4 is in the closed state.

[0076] The opening state of the piston shaft 4 is displayed: when the high-pressure fluid enters the opening cavity of the cylinder 5, the high-pressure fluid will push the piston disk 401 of the piston shaft 4 and cause the piston shaft 4 to move away from the housing 1. Under the action of the back pressure difference of the closing cavity of the cylinder 5, the high-pressure fluid in the gate display mechanism 8 will enter the cavity hole through the oil hole 8034 of the opening piston 803 and keep the opening piston 803 in the closed position (the opening piston is close to the side of the housing). Before the piston shaft 4 is close to the fully opened state, the ring block 801 will contact the first outer protrusion 8042 on the display rod 804 and push the display rod 804 to move away from the housing 1. The display rod 804 simultaneously pushes the opening piston 803 to open until the piston shaft 4 is fully opened and the opening piston 803 is fully opened. At this time, the display block 805 completely exposes the display block embedded counterbore 8035 of the opening piston 803 and is flush with the end of the cylinder cover 802, indicating that the piston shaft 4 is in the closed state.

[0077] Replacement of the gate body 2: remove the side door bolts 9 and all the side door nuts 11, use the side door opening and closing control mechanism 7 to open the side door 3, remove the gate 2 from the horizontal direction from the side of the side door bolts 9, and complete the parts replacement.

[0078] As for the device and the method of use disclosed in the embodiment, since they correspond to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0079] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A compact gate blowout preventer, characterized in that: include: A housing (1), wherein a gate body (2) is slidably connected to the inside of the housing (1) and opens and closes with each other; A side door (3), the side door (3) being connected to a side end of the housing (1) via a side door bolt (9), the side door (3) being provided with a central hole, and a through hole being provided on a side edge of the side door (3); A cylinder assembly, wherein the cylinder assembly is fixed to a side of the side door (3) away from the housing (1) by means of a connecting piece, and one end of a piston shaft (4) in the cylinder assembly passes through the center hole and is detachably connected to the gate body (2); a gate opening and closing display mechanism (8), the gate opening and closing display mechanism (8) being fixed to the cylinder cover (6) via a connecting piece, the gate opening and closing display mechanism (8) being provided with a display rod (804) for displaying the gate opening and closing state, the display rod (804) being coaxially arranged with the piston shaft (4) and slidably connected to the other end of the piston shaft (4); A connecting plate (13), the connecting plate (13) being rotatably connected to the shaft section of the cylinder cover (6), and the gate opening and closing display mechanism (8) limiting the axial movement of the connecting plate (13) on the shaft section; A side door opening and closing control mechanism (7), the side door opening and closing control mechanism (7) is arranged on one or more side door bolt connection positions, the side door opening and closing control mechanism (7) passes through the through hole and is fixedly connected to the housing (1), a telescopic switch piston rod (705) is provided on the side door opening and closing control mechanism (7), one end of the connecting plate (13) is detachably connected to the telescopic end of the switch piston rod (705), and an oil circuit for controlling the telescopic movement of the switch piston rod is provided on the housing (1).

2. A compact gate blowout preventer according to claim 1, characterized in that: The cylinder body (5) of the cylinder assembly is connected to the side of the side door (3) away from the housing (1) by bolts, the piston shaft (4) is slidably connected in the cylinder body (5), a piston disc (401) is fixed in the middle of the piston shaft (4), and the cylinder cover (6) is fixed to the end surface of the cylinder body (5) away from the side door (3) by bolts. An opening cavity and a closing cavity are formed inside the cylinder body (5) and on both sides of the corresponding piston disc (401), the opening cavity is arranged close to the side of the housing (1), and the closing cavity is arranged away from the side of the housing (1), one end of the piston shaft (4) is horizontally provided with a T-shaped hook (402) for disassembling the gate body (2), and the other end of the piston shaft (4) is provided with a countersunk hole (404), and a blind hole (403) is provided on the bottom wall of the countersunk hole (404).

3. A compact gate blowout preventer according to claim 2, characterized in that: The shaft section of the cylinder cover (6) is provided with a shaft hole for the other end of the avoidance piston shaft (4), and the other end of the piston shaft (4) can extend into the shaft hole. The connecting plate (13) is provided with a mounting hole for matching the shaft section. The two end edges of the connecting plate (13) are provided with slots for matching the switch piston rod (705). The gate opening and closing display mechanism (8) is connected to the end of the shaft section.

4. A compact ram blowout preventer according to claim 3, characterized in that: The gate opening and closing display mechanism (8) comprises a pressure cover (801), an end cover (802), an opening piston (803), and a display rod (804); the end cover (802) is fixed on the pressure cover (801), and the end cover and the pressure cover are fixedly connected to the end face of the shaft section through an end cover screw (806); the pressure cover (801) limits the axial movement of the connecting plate (13) on the shaft section; the pressure cover (801) and the end cover (802) are coaxially provided with holes for the opening piston (803) to slide; the opening piston (803) is dynamically sealedly connected to the holes on the corresponding pressure cover and the end cover; one end of the display rod (804) is slidably connected in the blind hole (403); the display rod (804) is dynamically sealedly slidably connected in the inner hole of the opening piston (803), and the other end of the display rod can extend out of the end of the opening piston (803).

5. A compact ram blowout preventer according to claim 4, characterized in that: A limiting portion (8041) is provided at one end of the display rod (804), and the limiting portion (8041) is slidably connected in the blind hole (403). A ring block (807) for limiting the axial movement of the limiting portion (8041) is fixedly connected in the counterbore (404). A first outer convex portion (8042) and a second outer convex portion (8043) are provided on the display rod (804) and at an axial interval corresponding to the display rod. The first outer convex portion (8042) is provided close to one side of the piston shaft (4), and the second outer convex portion (8043) is provided close to one side of the opening piston (803). The first outer convex portion (8042) and the second outer convex portion (8043) are located between the ring block (807) and the opening piston (803). A display block (805) is fixed at the other end of the display rod (804).

6. A compact ram blowout preventer according to claim 5, characterized in that: The opening piston (803) is a stepped cylinder structure. A plurality of sealing grooves (8031) are arranged on the outer wall of the piston disc of the opening piston (803). A cavity (8021) cooperating with the sliding movement of the piston disc is arranged on the inner side of the end cover (802). The outer peripheral side wall of the piston disc is dynamically sealed with the inner wall of the cavity. A step (8033) is arranged on the middle part of the inner wall of the opening piston (803). A plurality of annular grooves (8032) for dynamically sealingly connecting the display rod are arranged on the inner hole wall of the step (8033). A plurality of oil holes (8034) for connecting the inside and outside of the opening piston (803) are obliquely arranged on the side wall of the opening piston (803) close to the piston disc. The oil inside the opening piston (803) enters the cavity (8021) through the oil hole (8034) and prompts the opening piston to move. The second outer protrusion (8043) abuts against the step (8033) to limit the position.

7. A compact ram blowout preventer according to claim 6, characterized in that: The side door opening and closing control mechanism (7) comprises a switch cylinder stud (702), an oil nozzle (701), an oil plug (703), a switch piston rod (705), a compression sleeve (704) and a side door nut (11); the switch cylinder stud (702) is a cylindrical structure and both ends thereof are provided with external threaded connection parts (7021); one end of the switch cylinder stud (702) passes through the through hole and is connected to the housing (1); the oil nozzle (701) is fixed to the inner side of one end of the switch cylinder stud (702) and is used to connect the oil circuit on the housing (1); the oil plug (703) is a plug with a hole; the oil plug (703) is a plug with a hole. ) is threadedly connected to the inner side of the other end of the switch cylinder stud (702), the side door nut (11) is threadedly connected to the outer side of the other end of the switch cylinder stud (702), the pressing sleeve (704) is slidably located on the outer side of the switch cylinder stud (702), one end of the pressing sleeve (704) abuts against the side door (3), and the other end abuts against the side door nut (11) to limit, the switch piston rod (705) is slidably connected in the switch cylinder stud (702), and one end of the switch piston rod passes through the oil plug (703) and the side door nut (11) and is connected to the slot (1302) on the connecting plate (13).

8. A compact ram blowout preventer according to claim 7, characterized in that: A plurality of connecting threaded holes (101) are provided on both side end surfaces of the housing (1), one or more of the connecting threaded holes being in communication with a plurality of hydraulic oil circuit holes (103) on the housing (1), and a positioning step (102) for mounting the switch cylinder stud (702) being provided in the connecting threaded hole corresponding to the hydraulic oil circuit hole.

9. A compact ram blowout preventer according to claim 3, characterized in that: The slot hole (1302) on the connecting plate (13) is arranged to be rotated 180 degrees relative to the center of the connecting plate. The slot hole (1302) is a U-shaped slot hole or a circular through hole with one side open. The telescopic end of the switch piston rod (705) is provided with a limiting step for mounting and fixing the connecting plate. The telescopic end of the switch piston rod (705) is fixed to the connecting plate (13) using a fixing nut (14).

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