A redundant locking device for a failure reverse force-increasing liquid-gas collaborative vertical shaft explosion-proof cover

Abstract

The application discloses a kind of failure reverse force-increasing liquid-gas synergic mine shaft explosion-proof cover redundancy locking device, relating to mine explosion-proof cover technical field, including pedestal, explosion-proof cover body and piston cylinder, the pedestal is provided with explosion-proof cover body, piston cylinder, the both ends of piston cylinder are respectively connected with commutator one, commutator two by pipeline, the commutator one, commutator two are respectively connected with hydraulic pump and energy accumulator by pipeline, the piston plate side wall of piston cylinder inner wall is connected with piston rod, the connecting plate bottom of piston rod end is rotatably connected with connecting rod, the connecting rod bottom is rotatably connected with moving block, the moving block bottom is fixedly connected with locking plate, the explosion-proof cover body top is fixedly connected with annular locking frame, the piston cylinder is connected with air pump by pipeline.The application is equipped with piston cylinder, hydraulic pump, energy accumulator structure, realizes the dual function of normal locking and failure locking, improves the redundancy, safety and maintainability of device.

Description

Technical Field

[0001] This invention relates to the field of mine explosion-proof cover technology, specifically a redundant locking device for a failure-reverse-force-boosting hydraulic-gas synergistic vertical shaft explosion-proof cover. Background Technology

[0002] Shaft explosion-proof covers are critical safety equipment in the ventilation systems of coal mines, metal mines, and non-metal mines. Their main function is to automatically or manually open to release the shock wave in the event of a gas explosion or coal dust explosion underground, and to remain sealed under normal conditions to maintain the normal operation of the ventilation system. To ensure that the explosion-proof cover is not overturned under the action of an explosion shock wave, it is usually equipped with a highly reliable locking device.

[0003] Traditional locking devices mostly rely on a single hydraulic station or electric actuator as a power source. In the event of an underground explosion or sudden power outage, the hydraulic pump may be damaged, the pipeline may rupture, or the power supply may be interrupted, resulting in an instantaneous loss of locking power. Once the power source fails, the explosion-proof cover is very likely to loosen or be overturned under huge reverse wind pressure or impact load, causing a catastrophic secondary accident.

[0004] Patent CN109826506B discloses an automatic locking device for reverse ventilation of a shaft explosion-proof cover. The above patent realizes the loosening and locking of the explosion-proof cover, effectively preventing the explosion-proof cover from being pushed open by the positive pressure airflow during reverse ventilation, which would cause the airflow to short-circuit. It is convenient to use and saves costs.

[0005] The aforementioned patents have solved the problem of poor locking operation when the main ventilation fan reverses airflow, which can easily cause safety hazards. However, there is still room for optimization in terms of redundant locking of the explosion-proof cover. This application solves the problem that traditional vertical shaft explosion-proof covers rely on a single hydraulic pump, and once the power is cut off, the pump fails, or the pipeline breaks, the locking mechanism loses power and cannot lock.

[0006] Therefore, this application proposes a redundant locking device for a vertical shaft explosion-proof cover that achieves both normal locking and failure locking functions, including a failure-reverse force-boosting hydraulic-gas synergy. Summary of the Invention

[0007] The purpose of this invention is to provide a redundant locking device for a failed reverse-force hydraulic-gas synergistic vertical shaft explosion-proof cover, in order to solve the technical problem mentioned in the background art that traditional vertical shaft explosion-proof covers rely on a single hydraulic pump, and once the power is cut off, the pump fails, or the pipeline ruptures, the locking mechanism loses power and cannot lock.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a redundant locking device for a failure-reverse-force-boosting hydraulic-gas synergistic vertical shaft explosion-proof cover, comprising a base, an explosion-proof cover body, and a piston cylinder. The base is provided with the explosion-proof cover body and the piston cylinder. The piston cylinder is connected to a commutator one and a commutator two via pipes at both ends. The commutator one and the commutator two are respectively connected to a hydraulic pump and an accumulator via pipes. The commutator one is connected to the commutator two via a pipe. A piston rod is connected to the piston plate sidewall of the inner wall of the piston cylinder. A connecting rod is rotatably connected to the bottom of the connecting plate at the end of the piston rod. A moving block is rotatably connected to the bottom of the connecting rod. A locking plate is fixedly connected to the bottom of the moving block. The locking plate is slidably connected to the inner wall of the fixed frame. An annular locking frame is fixedly connected to the top of the explosion-proof cover body. An air pump is connected to the piston cylinder via a pipe.

[0009] Preferably, a compensation plate is fixedly connected to the bottom of the locking plate, the compensation plate is slidably connected to the inner wall of the fixed frame, a supplementary spring is fixedly connected to the side wall of the compensation plate, a fixed frame is fixedly connected to the end of the supplementary spring, a lifting plate is slidably connected to the inner wall of the fixed frame, a lifting motor is connected to the lifting plate through a rotating shaft, the rotating shaft at the bottom of the lifting motor is threadedly connected to the lifting plate, a connecting spring is fixedly connected to the top of the lifting plate, an inclined block is fixedly connected to the top of the connecting spring, a slot is opened at the bottom of the locking plate, the slot is fitted into the outer wall of the inclined block, a fixed frame is slidably connected to the outer wall of the inclined block, and a lifting motor is fixedly installed inside the fixed frame.

[0010] Preferably, a baffle is slidably connected to the inner wall of the locking plate, a fixed frame is slidably connected to the outer wall of the baffle, an electric push rod is fixedly installed inside the fixed frame, a stop block is fixedly connected to the output end of the electric push rod, a wedge block one is fixedly connected to the side wall of the baffle, the bottom inclined surface of the wedge block one contacts the top inclined surface of the wedge block two, a locking plate is slidably connected to the outer walls of the wedge block one and the wedge block two, a compression spring is fixedly connected to the bottom of the side plates on both sides of the wedge block two, and a locking plate is fixedly connected to the bottom of the compression spring.

[0011] Preferably, a rotating rod is rotatably connected to the inner wall of the annular locking frame, a second bevel gear is fixedly connected to the outer wall of the rotating rod, a first bevel gear is meshed with the side wall of the second bevel gear, a rotating block is connected to the first bevel gear through a rotating shaft, the rotating block is rotatably connected to the inner wall of the annular locking frame, and a pressing plate is threadedly connected to the outer wall of the rotating rod. The top inclined surface of the pressing plate contacts the bottom inclined surface of the pressing pad, and the pressing pad and the pressing plate are slidably connected to the inner wall of the annular locking frame.

[0012] Preferably, the outer wall of the second wedge block is symmetrically fixedly connected with a side plate, the outer wall of the side plate is slidably connected with a locking plate, the inner wall of the locking plate is slidably connected with a limit plate, the limit plate is symmetrically fixedly connected to the outer wall of the first wedge block, the bottom of the inner wall of the fixing frame is provided with a sliding groove, and the side wall of the sliding groove is slidably connected with a baffle.

[0013] Preferably, the piston plate is slidably connected to the inner wall of the piston cylinder, and the piston plate divides the inside of the piston cylinder into a forward chamber and a reverse chamber. The piston rod extends from one end of the piston cylinder. The forward chamber is located on the side of the piston plate where the piston rod is provided, and the reverse chamber is located on the side of the piston plate where the piston rod is not provided. Pressure relief valves are respectively provided on the forward chamber and the reverse chamber of the piston cylinder. The control terminals of the pressure relief valves on the forward chamber and the reverse chamber are connected to the control circuit of the hydraulic pump through signal lines. The hydraulic pump is connected to an oil tank through a pipeline. An air pump is connected to the side of the piston cylinder connected to the second commutator through a pipeline.

[0014] Preferably, the control terminals of commutator one and commutator two are connected to the control circuit of the hydraulic pump via signal lines. A pressure sensor is installed in the connecting pipe between commutator one and piston cylinder. The control circuits of the air pump and hydraulic pump are connected to the pressure sensor via signal lines. The control terminals of the pressure relief valves on the forward and reverse chambers are connected to the control circuit of the air pump via signal lines.

[0015] Preferably, a one-way valve is provided on the connecting pipe between commutator one and commutator two, which only allows the medium to flow from commutator two to commutator one, and a one-way valve is provided on the connecting pipe between commutator two and piston cylinder, which only allows the medium to flow from commutator two to piston cylinder.

[0016] Preferably, a placement frame is provided on the top of the base, the accumulator and the air pump are fixedly installed on the placement frame, a connecting plate is fixedly connected to the end of the piston rod away from the piston plate, and the moving block is slidably connected to the inner wall of the fixed frame.

[0017] Preferably, the inner wall of the annular locking frame is detachably connected to a disassembly plate, which is fixed to the annular locking frame by bolts.

[0018] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention, through the installation of a piston cylinder, hydraulic pump, and accumulator structure, achieves isomorphic locking action under normal and failure conditions. Whether the piston rod extends or retracts, the deflection direction of the connecting rod can drive the locking plate to move towards the annular locking frame. This solves the problem that traditional vertical shaft explosion-proof covers rely on a single hydraulic pump, and once the power is cut off, the pump fails, or the pipeline is broken, the locking mechanism loses power and cannot lock. It achieves the dual functions of normal locking and failure locking, and improves the redundancy, safety, and maintainability of the device. 2. This invention achieves rigid positioning during the structural reset process by installing a lifting motor, an inclined block, and a connecting spring structure. When the locking plate retracts to its original position, the inclined block automatically inserts into the slot through the elastic force of the connecting spring, completing mechanical self-calibration. After reset, the inclined block directly abuts against the locking plate, forming a rigid fulcrum to prevent invalid displacement. This solves the problem of locking plate drift caused by hydraulic system inertia, avoids invalid displacement of the locking plate in non-working state, and reduces wear on the locking plate. 3. This invention, through the installation of a stop block, a wedge block one, and a wedge block two structure, when the locking plate tends to retract under wind pressure, the inclined surface pair formed by the wedge block one and the inclined wedge block two converts the horizontal retraction displacement into a vertically downward pressing force, which directly acts on the annular locking frame. The stop block blocks the retraction path of the baffle plate, transforming the slight retraction of the locking plate into further pressing of the annular locking frame, eliminating the retraction space, reducing the relative sliding wear between the locking plate and the annular locking frame, solving the problem of locking failure caused by wear, and improving the reliability of the locking state; 4. This invention achieves wear clearance compensation through a structure consisting of an extrusion plate, a clamping pad, and a rotating rod. The rotating rod and the extrusion plate form a helical transmission pair, converting rotational motion into linear feed of the extrusion plate. The inclined surface of the extrusion plate then pushes the clamping pad upwards. Maintenance personnel only need to use tools to rotate the rotating block to compensate for the wear clearance, enabling rapid on-site maintenance. By installing a detachable disassembly plate on the side wall of the annular locking frame, when the clamping pad becomes insufficient in thickness due to long-term wear, the disassembly plate can be directly removed to replace the clamping pad without replacing the entire annular locking frame. This solves the problems of increased fit clearance caused by long-term wear and the resulting impact displacement and structural loosening. Attached Figure Description

[0019] Figure 1 This is a front view structural diagram of the present invention; Figure 2 This is a front view structural schematic diagram of the hydraulic pump, accumulator, and piston cylinder of the present invention; Figure 3 This is a front view schematic diagram of wedge block one and wedge block two of the present invention; Figure 4 This is a front view schematic diagram of the annular locking frame of the present invention; Figure 5 This is a schematic diagram of the piston cylinder connection structure of the present invention; Figure 6 This is a cross-sectional view of the fixing frame of the present invention; Figure 7 This is a cross-sectional view of the locking plate of the present invention; Figure 8 This is a cross-sectional view of the ring locking frame of the present invention.

[0020] In the diagram: 1. Base; 2. Explosion-proof cover; 3. Piston cylinder; 4. Hydraulic pump; 5. Accumulator; 6. Air pump; 7. Annular locking frame; 8. Oil tank; 9. Piston rod; 10. Connecting plate; 11. Connecting rod; 12. Moving block; 13. Locking plate; 14. Fixing frame; 15. Placement frame; 16. Baffle; 17. Wedge block one; 18. Compression spring; 19. Wedge block two; 20. Stop block; 21. Electric push rod; 22. Connecting spring; 23. Inclined block; 2 4. Lifting motor; 25. Lifting plate; 26. Side plate; 27. Limiting plate; 28. Supplementary spring; 29. ​​Slot; 30. Sliding groove; 31. Rotating shaft; 32. Commutator 1; 33. Commutator 2; 34. Reverse cavity; 35. Forward cavity; 36. Disassembly plate; 37. Piston plate; 38. Pressure pad; 39. Rotating block; 40. Extrusion plate; 41. Rotating rod; 42. Compensating plate; 43. Bolt; 44. Bevel gear 1; 45. Bevel gear 2. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0024] Please see Figure 1 , Figure 2 , Figure 4 and Figure 5This invention provides an embodiment of a redundant locking device for a failed reverse-force boosting hydraulic-gas synergistic vertical shaft explosion-proof cover, comprising a base 1, an explosion-proof cover 2, and a piston cylinder 3. The base 1 is provided with the explosion-proof cover 2 and the piston cylinder 3. The piston cylinder 3 has two ends connected to a commutator 1 32 and a commutator 2 33 respectively via pipes. The commutator 1 32 and the commutator 2 33 are respectively connected to a hydraulic pump 4 and an accumulator 5 via pipes. The commutator 1 32 is connected to the commutator 2 33 via a pipe. A piston rod 9 is connected to the side wall of the piston plate 37 on the inner wall of the piston cylinder 3. A connecting plate 10 at the end of the piston rod 9 is rotatably connected to a connecting rod 11 at its bottom. A moving block 12 is rotatably connected to the bottom of the connecting rod 11. A locking plate 13 is fixedly connected to the bottom of the moving block 12. The locking plate 13 is slidably connected to the inner wall of the fixed frame 14. The top of the burst-out cover 2 is fixedly connected to an annular locking frame 7. The piston cylinder 3 is connected to the side of the commutator 2 33 via a pipe to an air pump 6. The piston plate 37 is slidably connected to the inner wall of the piston cylinder 3. The piston plate 37 divides the inside of the piston cylinder 3 into a forward chamber 35 and a reverse chamber 34. The piston rod 9 extends from one end of the piston cylinder 3. The forward chamber 35 is located on the side of the piston plate 37 where the piston rod 9 is located, and the reverse chamber 34 is located on the side of the piston plate 37 where the piston rod 9 is not located. Pressure relief valves are respectively installed on the forward chamber 35 and the reverse chamber 34 of the piston cylinder 3. The control terminals of the pressure relief valves on the forward chamber 35 and the reverse chamber 34 are connected to the control circuit of the hydraulic pump 4 via signal lines. The hydraulic pump 4 is connected to an oil tank 8 via a pipe. The side of the piston cylinder 3 connected to the commutator 2 33 is connected to an air pump 6 via a pipe.

[0025] Furthermore, during normal operation, the commutator 32 connects the passage between the hydraulic pump 4 and the piston cylinder 3. The pressure relief valve on the reverse chamber 34 opens, and the pressure relief valve on the forward chamber 35 closes. The hydraulic pump 4 starts, pumping hydraulic oil from the oil tank 8 into the forward chamber 35 of the piston cylinder 3. The pressure in the forward chamber 35 increases, pushing the piston plate 37 to move along the inner wall of the piston cylinder 3. The piston plate 37 moves away from the fixed frame 14, driving the piston rod 9. The piston rod 9 tends to extend, and the piston rod 9 pulls the connecting rod 11 through the connecting plate 10, causing the connecting rod 11 to drive the moving block 12 to slide along the inner wall of the fixed frame 14 towards the explosion-proof cover 2. The moving block 12 drives the locking plate 13 to slide along the inner wall of the fixed frame 14 towards the annular locking frame 7, so that the locking plate 13 is locked on the annular locking frame 7 at the top of the explosion-proof cover 2, thus achieving reliable locking of the explosion-proof cover 2. After locking, the hydraulic pump 4 stops supplying oil, and at the same time, the reversing device 32 is in the neutral closed state, and the forward cavity 35 is pressurized, thereby maintaining the locking state of the locking plate 13 and the annular locking frame 7. When reset is required, the pressure relief valve of the forward cavity 35 is opened and the pressure relief valve of the reverse cavity 34 is closed. The air pump 6 is started to charge the reverse cavity 34 with air, and the piston plate 37 is pushed towards the fixed frame 14. The oil medium in the forward cavity 35 is discharged through the pressure relief valve. When hydraulic pump 4 malfunctions, experiences a power outage, or the pipeline between hydraulic pump 4 and piston cylinder 3 splits, hydraulic pump 4 cannot stably supply oil to forward chamber 35, causing forward chamber 35 to fail to establish working pressure. The pressure sensor between commutator 1 32 and piston cylinder 3 detects that the pressure is below the set threshold and sends a failure signal to PLC. PLC prohibits hydraulic pump 4 from starting and triggers accumulator 5 and air pump 6. Commutator 2 33 opens the passage between piston cylinder 3 and accumulator 5, and the high-pressure oil stored in accumulator 5 enters reverse chamber 34 in piston cylinder 3. Air pump 6 simultaneously inputs high-pressure gas into reverse chamber 34, forming a hydraulic-gas co-pressurization. The pressure relief valve of forward chamber 35 opens to release pressure, and the pressure relief valve of reverse chamber 34 closes. The high-pressure oil and high-pressure gas in reverse chamber 34 act together on the large area side of piston plate 37, i.e., the side other than piston rod 9. Piston plate 37 moves towards the fixed frame 14, and piston plate 37 drives piston rod 9, causing piston rod 9 to retract. The piston rod 9 drives the connecting plate 10, the connecting plate 10 drives the connecting rod 11, the connecting rod 11 drives the moving block 12, and the moving block 12 drives the locking plate 13, so that the locking plate 13 is embedded in the annular locking frame 7 to lock the explosion-proof cover 2. In the initial state, the connecting rod 11 is perpendicular to the piston rod 9. Therefore, when the connecting plate 10 at the end of the piston rod 9 drives the connecting rod 11, whether it is the forward movement of the piston rod 9 during normal operation or the reverse movement during failure, after the connecting rod 11 deflects, it will drive the moving block 12 to move closer to the annular locking frame 7. Thus, the locking action can be achieved in both normal operation and failure. The piston plate 37 is moved closer to the fixed frame 14 by utilizing the reverse force amplification effect. Reverse force amplification means that, under the redundant operating condition of hydraulic pump 4 failure, the area difference between the two sides of piston plate 37 is utilized. Specifically, under the action of piston rod 9, the effective working area on one side of piston plate 37 with piston rod 9 is smaller than the area on the other side without piston rod 9. High-pressure oil and high-pressure gas are introduced from the reverse chamber 34 on the larger area side as a power source. Under the condition of inputting the same pressure medium, a larger working area can obtain a larger thrust output, thus achieving the force amplification effect. This allows piston plate 37 to still obtain a locking force greater than or equal to that under normal locking conditions even under failure conditions, enabling locking plate 13 to still move to the locked position. This achieves safe locking without relying on hydraulic pump 4, ensuring that a sufficiently large locking force can still be output even under the redundant operating condition of hydraulic pump 4 failure. During the locking period, forward chamber 35 is closed and pressure-maintained by commutator 2 33 in the middle position, while reverse chamber 34 remains in a low-pressure or closed state. When reset is required, after the personnel have completed the maintenance of the hydraulic system... Hydraulic pump 4 supplies oil to forward chamber 34, and the pressure relief valve of forward chamber 35 is closed while the pressure relief valve of reverse chamber 34 is open. Hydraulic oil and gas in reverse chamber 35 are discharged through the pressure relief valve. Through the triple power sources of hydraulic pump 4, accumulator 5, and air pump 6, normal locking and failure locking are achieved. Failure of any power source does not affect the overall safety function, resulting in high redundancy. Locking plate 13 is embedded in annular locking frame 7. When the explosion-proof cover 2 is subjected to upward wind pressure, the annular locking frame 7 and locking plate 13 are subjected to upward force, and locking plate 13 locks the annular ring. The frame 7 applies a downward restraining force to prevent the explosion-proof cover 2 from being dislodged by wind pressure. After the mine fan stops, the counterweight will pull up the explosion-proof cover 2. After the explosion-proof cover 2 is raised and lowered, it will rotate slightly. The annular locking frame 7 will rotate slightly at the same time. The annular structure of the annular locking frame 7 ensures that when the explosion-proof cover 2 rotates slightly, the locking plate 13 can also be stably embedded in the annular locking frame 7, ensuring the contact and cooperation relationship between the locking plate 13 and the annular locking frame 7, and preventing the locking plate 13 from failing to embed in the annular locking frame 7 due to angular deviation.

[0026] Please see Figure 1 , Figure 2 , Figure 4 and Figure 6An embodiment of the present invention provides a redundant locking device for a failed reverse-force boosting hydraulic-gas coordinated vertical shaft explosion-proof cover. A compensation plate 42 is fixedly connected to the bottom of a locking plate 13. The compensation plate 42 is slidably connected to the inner wall of a fixing frame 14. A supplementary spring 28 is fixedly connected to the side wall of the compensation plate 42. The end of the supplementary spring 28 is fixedly connected to the fixing frame 14. A lifting plate 25 is slidably connected to the inner wall of the fixing frame 14. A lifting motor 24 is connected to the lifting plate 25 via a rotating shaft 31. The rotating shaft 31 at the bottom of the lifting motor 24 is threadedly connected to the lifting plate 25. A connecting spring 22 is fixedly connected to the top of the lifting plate 25. An inclined block 23 is fixedly connected to the top of the connecting spring 22. The bottom of the locking plate 13... The part has a slot 29, which is fitted onto the outer wall of the inclined block 23. A fixed frame 14 is slidably connected to the outer wall of the inclined block 23. A lifting motor 24 is fixedly installed inside the fixed frame 14. The commutator 1 32 and the commutator 2 33 are respectively connected to the hydraulic pump 4 and the accumulator 5 through pipes. The piston plate 37 on the inner wall of the piston cylinder 3 is connected to the side wall of the piston rod 9. The bottom of the connecting plate 10 at the end of the piston rod 9 is rotatably connected to the connecting rod 11. The bottom of the connecting rod 11 is rotatably connected to the moving block 12. The bottom of the moving block 12 is fixedly connected to the locking plate 13. The locking plate 13 is slidably connected to the inner wall of the fixed frame 14. The top of the explosion-proof cover 2 is fixedly connected to the annular locking frame 7. The piston cylinder 3 is connected to the air pump 6 through pipes.

[0027] Furthermore, before the locking plate 13 moves to perform the locking action, the lifting motor 24 is started. The lifting motor 24 drives the rotating shaft 31 to rotate in the forward direction. The rotating shaft 31 drives the lifting plate 25 to move downward. The lifting plate 25 drives the connecting spring 22 and the inclined block 23 to move downward, so that part of the inclined block 23 in the slot 29 is completely removed. At this time, normal locking or failure locking can be performed. By starting the hydraulic pump 4 or the accumulator 5 and the air pump 6, the piston rod 9 is driven to move in the forward or reverse direction, thereby driving the connecting plate 10, the connecting rod 11, the moving block 12, and the locking plate 13 to move. At this time, the inclined block 23 can no longer obstruct the movement of the locking plate 13, and the locking plate 13 can... During normal locking, as the locking plate 13 moves, the connecting spring 22 releases its stretched elastic potential energy and applies elastic force to the compensating plate 42, further ensuring the movement of the locking plate 13 and guaranteeing its stable embedding into the annular locking frame 7. After embedding, the lifting motor 24 drives the rotating shaft 31 to rotate in the opposite direction, driving the lifting plate 25 to move upward. The lifting plate 25 then resets the connecting spring 22 and the inclined block 23. When the locking plate 13 is reset in the unlocked state, it moves away from the annular locking frame 7 and gradually approaches the inclined block 23. When the top inclined surface of the face block 23 contacts, the locking plate 13 drives the inclined block 23 to compress the connecting spring 22, causing the inclined block 23 to move downwards, thereby allowing the locking plate 13 to gradually pass over the top of the inclined block 23. As the locking plate 13 continues to move, when the slot 29 moves above the inclined block 23, the connecting spring 22 releases its elastic potential energy, causing the inclined block 23 to move upwards and insert into the slot 29. At this time, the piston rod 9 moves to the initial position. If the piston rod 9 does not stop and has a tendency to continue moving in the forward or reverse direction, that is, the piston plate 37 does not stop when it moves to the original position and continues to move in the same direction, after completing the normal working condition, during the reset, it continues... The lock proceeds towards the failure condition lock state; or after the failure condition is completed, during reset, it proceeds towards the normal condition lock state. The inclined block 23 abuts against the locking plate 13, preventing further movement of the locking plate 13, ensuring that the positioning of the inclined block 23 can keep the structure in its initial position when the structure is reset; the supplementary spring 28 applies a horizontal elastic force to the compensation plate 42, eliminating the transmission gap between the locking plate 13, the moving block 12, and the connecting rod 11, and providing auxiliary propulsion force during the locking process to prevent jamming caused by frictional resistance. Through the coordination of the supplementary spring 28 and the three power sources, dynamic compensation and redundancy protection of the locking force are achieved.Furthermore, after the locking state is released, the locking plate 13 needs to exit from the annular locking frame 7 and return to its initial position. The inclined block 23 assists in positioning the locking plate 13, ensuring that during the resetting process, due to the inertia of the hydraulic system, the piston plate 37 may continue to move due to residual kinetic energy when it reaches its original position, causing the locking plate 13 to fail to reset accurately and potentially attempt to re-lock. At this point, the inclined block 23, by resisting and fixing the locking plate 13, prevents it from attempting to move again. The side wall of the inclined block 23 directly bears and counteracts this force, avoiding ineffective displacement of the locking plate 13 and preventing ineffective friction between the locking plate 13 and surrounding structures when not in operation. This reduces wear on the locking plate 13 to some extent and avoids repeated manual adjustments to its position, preventing multiple meaningless impacts and frictions between the locking plate 13, the annular locking frame 7, and the fixing frame 14. It also prevents increased clearance between the locking plate 13 and the annular locking frame 7 due to localized wear.

[0028] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 7 One embodiment of the present invention provides a redundant locking device for a failed reverse-force boosting hydraulic-gas coordinated vertical shaft explosion-proof cover. A baffle 16 is slidably connected to the inner wall of a locking plate 13, and a fixing frame 14 is slidably connected to the outer wall of the baffle 16. An electric push rod 21 is fixedly installed inside the fixing frame 14, and a stop block 20 is fixedly connected to the output end of the electric push rod 21. A wedge block 17 is fixedly connected to the side wall of the baffle 16, and the bottom inclined surface of the wedge block 17 contacts the top inclined surface of the wedge block 29. The locking plate 13 is slidably connected to the outer walls of the wedge block 17 and the wedge block 29. Compression springs 18 are fixedly connected to the bottom of the side plates 26 on both sides of the wedge block 2 19. Locking plates 13 are fixedly connected to the bottom of the compression springs 18. A ring-shaped locking frame 7 is fixedly connected to the top of the explosion-proof cover 2. Side plates 26 are symmetrically fixedly connected to the outer wall of the wedge block 2 19. Locking plates 13 are slidably connected to the outer wall of the side plates 26. Limiting plates 27 are slidably connected to the inner wall of the locking plates 13. Limiting plates 27 are symmetrically fixedly connected to the outer wall of the wedge block 1 17. A sliding groove 30 is opened at the bottom of the inner wall of the fixing frame 14. A baffle 16 is slidably connected to the side wall of the sliding groove 30.

[0029] Furthermore, the electric push rod 21 drives the stop block 20 to move downward, so that the stop block 20 is not in the sliding groove 30. During the process of the locking plate 13 being embedded in the annular locking frame 7, the locking plate 13 drives the baffle 16, wedge block 17, and wedge block 19 to move synchronously. The compression spring 18 applies an upward elastic force to the side plate 26, so that the side plate 26, wedge block 19, and wedge block 17 maintain their initial state. The bottom area of ​​the baffle 16 slides on the outer wall of the sliding groove 30. The baffle 16 passes over the stop block 20. After the locking plate 13 is embedded in the annular locking frame 7, the electric push rod 21 is activated. The electric push rod 21 drives the stop block 20 to move upward. The stop block 20 blocks the retraction path of the baffle 16, making the baffle 16 a fixed fulcrum. At this time, when the explosion-proof cover 2 is impacted by wind pressure, the locking plate 13 will have a slight displacement. If the locking plate 13 shows a tendency to retract, the locking plate 13 will have a slight displacement, while the baffle 16 is in the stop block 2. When stationary under the obstruction of 0, the locking plate 13 drives the second wedge block 19, causing the second wedge block 19 to move along the inclined surface of the first wedge block 17, thus moving the second wedge block 19 downward relative to the locking plate 13. Under the action of the limiting plate 27, the first wedge block 17 can only move horizontally relative to the locking plate 13, and under the action of the side plate 26, the second wedge block 19 can only move vertically relative to the locking plate 13. As the locking plate 13 retracts slightly, the second wedge block 19 moves downward, pressing down on the annular locking frame 7. As the retraction distance increases, the downward pressure increases, thus achieving a self-locking effect of increasing pressure as it retracts. The second wedge block 19 and the first wedge block 17 form a pair of inclined surface transmission pairs. When the locking plate 13 shows a tendency to retract, the second wedge block 19 is forced to slide down along the inclined surface of the first wedge block 17, converting the horizontal retraction displacement into a vertical downward pressing force, which directly acts on the annular locking frame 7. The greater the retraction of the locking plate 13, the greater the pressure. The more the wedge block 19 slides down, the greater the positive pressure on the annular locking frame 7, and the greater the friction between the locking plate 13 and the annular locking frame 7, further suppressing the retraction and forming an irreversible self-locking tendency. When the explosion-proof cover is subjected to wind pressure impact and produces a small displacement, the wedge block 19 absorbs the impact energy through the compression spring 18 to avoid rigid impact. When the locking plate 13 shows a tendency to retract displacement, it can further suppress the retraction, thereby reducing the relative displacement between the locking plate 13 and the annular locking frame 7, thereby reducing the wear between the annular locking frame 7 and the locking plate 13. Once the locking plate 13 retracts slightly, its contact surface with the annular locking frame 7 will produce relative sliding, resulting in abrasive wear and adhesive wear. The retraction tendency of the locking plate 13 is converted into the vertical downward pressing motion of the wedge block 19. The greater the retraction amount, the greater the squeezing force, and the greater the friction between the locking plate 13 and the annular locking frame 7, converting the horizontal displacement energy that would originally cause wear into vertical pressing energy, further ensuring the locking state.

[0030] Please see Figure 1 , Figure 2 , Figure 4 and Figure 8An embodiment of the present invention provides a redundant locking device for a failed reverse-force boosting liquid-gas synergistic vertical well explosion-proof cover. A rotating rod 41 is rotatably connected to the inner wall of an annular locking frame 7. A bevel gear 45 is fixedly connected to the outer wall of the rotating rod 41. A bevel gear 44 is meshed with the side wall of the bevel gear 45. A rotating block 39 is connected to the bevel gear 44 through a rotating shaft. The rotating block 39 is rotatably connected to the inner wall of the annular locking frame 7. A pressing plate 40 is threadedly connected to the outer wall of the rotating rod 41. The top inclined surface of the pressing plate 40 contacts the inclined surface of the bottom pressing pad 38. The pressing pad 38 and the pressing plate 40 are slidably connected to the inner wall of the annular locking frame 7. A locking plate 13 is slidably connected to the inner wall of a fixed frame 14. An annular locking frame 7 is fixedly connected to the top of the explosion-proof cover 2. A disassembly plate 36 is detachably connected to the inner wall of the annular locking frame 7. The disassembly plate 36 is fixed to the annular locking frame 7 by bolts 43.

[0031] Furthermore, during long-term use of the explosion-proof cover 2, the hard contact surface between the locking plate 13 and the annular locking frame 7 will inevitably experience mechanical wear due to shearing and friction. This wear will increase the clearance between the two. When the explosion-proof cover 2 is subjected to downhole impact, the locking plate 13 will experience severe impact displacement within the clearance, leading to structural loosening. When the inspection personnel detect that the locking plate 13 is shaking or the clearance exceeds the standard, they use a tool to rotate the rotating block 39. The rotating block 39 drives the first bevel gear 44 to rotate through the rotating shaft. The first bevel gear 44 drives the second bevel gear 45 to rotate. The second bevel gear 45 drives the rotating rod 41 to rotate. Under the action of the thread between the rotating rod 41 and the pressing plate 40, the rotating rod 41 drives the pressing plate 40 to move axially along the rotating rod 41. The top inclined surface of the pressing plate 40 pushes the pressing pad 38 to slide upward along the inner wall of the annular locking frame 7, thereby confirming that the pressing pad 38 is inserted into the annular locking frame 7 after the locking plate 13 is embedded in the annular locking frame 7. When the locking plate 13 is tightly pressed against the ring, the rotating block 39 will no longer rotate. In subsequent normal or failure conditions, the locking plate 13 is inserted into the annular locking frame 7, and the upward movement of the pressure pad 38 directly fills the wear gap between the locking plate 13 and the annular locking frame 7, ensuring the contact pressure between the locking plate 13 and the annular locking frame 7. By eliminating the vertical clearance, harmful vibrations are avoided when the explosion-proof cover is impacted, solving the most troublesome wear and loosening problem in the long-term operation of the vertical shaft explosion-proof cover. In addition, when the pressure pad 38 is insufficient in thickness due to long-term wear, the bolts 43 on the disassembly plate 36 can be unscrewed, thereby removing the disassembly plate 36 from the annular locking frame 7. At this time, there is operable movement space on the side wall of the pressure pad 38, making it easy to remove the pressure pad 38 and replace it directly. Thus, when the pressure pad 38 is severely worn, it can be replaced directly without replacing the entire annular locking frame 7, greatly reducing spare parts costs and maintenance time.

[0032] Please see Figure 1 , Figure 2 and Figure 5One embodiment of the present invention provides a redundant locking device for a failed reverse-force boosting hydraulic-gas synergistic vertical shaft explosion-proof cover. A piston plate 37 is slidably connected to the inner wall of a piston cylinder 3, dividing the interior of the piston cylinder 3 into a forward chamber 35 and a reverse chamber 34. A piston rod 9 extends from one end of the piston cylinder 3. The forward chamber 35 is located on the side of the piston plate 37 where the piston rod 9 is located, and the reverse chamber 34 is located on the side of the piston plate 37 where the piston rod 9 is not located. Pressure relief valves are respectively installed on the forward chamber 35 and the reverse chamber 34 of the piston cylinder 3. The control terminals of the pressure relief valves on the forward chamber 35 and the reverse chamber 34 are connected to a hydraulic pump 4 via signal lines. The control circuit is connected, the hydraulic pump 4 is connected to the oil tank 8 through the pipeline, the piston cylinder 3 is connected to one side of the commutator 2 33 through the pipeline and the air pump 6 is connected; the connecting pipeline between commutator 1 32 and commutator 2 33 is equipped with a one-way valve that only allows the medium to flow from commutator 2 33 to commutator 1 32, the connecting pipeline between commutator 2 33 and piston cylinder 3 is equipped with a one-way valve that only allows the medium to flow from commutator 2 33 to piston cylinder 3, commutator 1 32 and commutator 2 33 are respectively connected to the hydraulic pump 4 and the accumulator 5 through the pipeline, and the accumulator 5 and the air pump 6 are fixedly installed on the placement frame 15.

[0033] Furthermore, after the locking state of the failure condition ends and the structure is reset, and the hydraulic system of hydraulic pump 4 has been maintained, at this time, commutator 1 32 connects the passage between hydraulic pump 4 and commutator 1 32, and commutator 2 33 connects the passage between accumulator 5 and commutator 1 32. At this time, the passage between hydraulic pump 4 and accumulator 5 on the mounting frame 15 is connected, and hydraulic pump 4 can pressurize high-pressure oil into accumulator 5. After the pressure in accumulator 5 reaches the preset value, hydraulic pump 4 stops supplying oil, and commutator 1 32 and commutator 2 33 switch to the neutral closed position so that when the failure condition occurs again, accumulator 5 can supply oil to the reverse chamber 34 of piston cylinder 3, which can respond to new locking requirements or deal with potential failure conditions. In addition, a one-way valve is provided on the connecting pipe between commutator 2 33 and piston cylinder 3. This one-way valve only allows the medium to flow from commutator 2 33. The oil flows to piston cylinder 3, thus preventing backflow of hydraulic oil when accumulator 5 supplies oil to reverse chamber 34, ensuring the continuous effectiveness of the locking mechanism; a one-way valve is installed on the connecting pipe between commutator 1 32 and commutator 2 33. This one-way valve only allows the medium to flow from commutator 2 33 to commutator 1 32, thus ensuring that the oil flows to piston cylinder 3 when hydraulic pump 4 replenishes oil to accumulator 5, preventing oil from flowing back from commutator 1 32 into commutator 2 33 or hydraulic pump 4 circuit, preventing backflow of oil during replenishment, ensuring that accumulator 5 can successfully complete pressure replenishment and reach the preset value, while maintaining the unidirectional flow characteristics of the system oil circuit, avoiding a decrease in replenishment efficiency or system pressure instability due to backflow, thus ensuring the reliability of the entire redundant locking device after reset, and making sufficient hydraulic preparations for subsequent failure conditions.

[0034] Working principle: In the initial state of the device, the lifting motor 24 drives the inclined block 23 to move down, releasing the fixation of the locking plate 13, and starting the hydraulic pump 4. High pressure oil enters the forward chamber 35 of the piston cylinder 3 through the reversing device 32, and the reverse chamber 34 is depressurized, driving the piston plate 37 to move away from the fixed frame 14. Through the piston rod 9 and the connecting rod 11, the locking plate 13 is horizontally embedded into the annular locking frame 7. After locking in place, the hydraulic pump 4 stops, and the reversing device 32 is in the neutral closed state. The incompressibility of the oil maintains the pressure in the forward chamber 35, locking the explosion-proof cover 2. When the hydraulic pump 4 fails, loses power, or the pipeline breaks, the PLC prohibits the hydraulic pump 4 from starting, opens the commutator 2 33, and the accumulator 5 and the air pump 6 work together to supply oil and air to the reverse chamber 34 of the piston cylinder 3. By utilizing the area difference on both sides of the piston plate 37, a greater thrust output is obtained under the same pressure. The piston plate 37 moves in the reverse direction, causing the locking plate 13 to be embedded in the annular locking frame 7. When the electric push rod 21 raises the stop block 20, if the locking plate 13 shows a tendency to retract, the wedge block 19 converts the horizontal displacement into a vertical clamping force. When the lock is released, the lifting motor 24 starts again to move the inclined block 23 down. If it is a normal reset, the air pump 6 pressurizes the reverse chamber 34. If it is a reset after failure, after the hydraulic system maintenance is completed, the hydraulic pump 4 supplies oil to the forward chamber 35. The piston plate 37 drives the locking plate 13 to disengage from the annular locking frame 7 and retract. When it passes the inclined block 23, the inclined block 23 is compressed and pops out and inserts into the slot 29 of the locking plate 13 to prevent the piston rod 9 from overshooting and causing invalid displacement. After the reset is completed, the hydraulic pump 4 replenishes oil to the accumulator 5, and the pressure of the accumulator 5 is restored to the preset value.

[0035] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A redundant locking device for a failed reverse-force boosting hydraulic-gas synergistic vertical shaft explosion-proof cover, characterized in that: The piston cylinder includes a base (1), an explosion-proof cover (2), and a piston cylinder (3). The base (1) is provided with the explosion-proof cover (2) and the piston cylinder (3). The piston cylinder (3) is connected to a commutator one (32) and a commutator two (33) through pipes at both ends. The commutator one (32) and the commutator two (33) are connected to a hydraulic pump (4) and an accumulator (5) through pipes, respectively. The commutator one (32) is connected to the commutator two (33) through a pipe. The piston cylinder (3) has a movable inner wall. A piston rod (9) is connected to the side wall of the stopper plate (37). A connecting rod (11) is rotatably connected to the bottom of the connecting plate (10) at the end of the piston rod (9). A moving block (12) is rotatably connected to the bottom of the connecting rod (11). A locking plate (13) is fixedly connected to the bottom of the moving block (12). The locking plate (13) is slidably connected to the inner wall of the fixed frame (14). A ring locking frame (7) is fixedly connected to the top of the explosion-proof cover (2). An air pump (6) is connected to the piston cylinder (3) through a pipe.

2. The redundant locking device for a failed reverse-force boosting hydraulic-gas synergistic vertical shaft explosion-proof cover according to claim 1, characterized in that: The bottom of the locking plate (13) is fixedly connected to a compensation plate (42), which is slidably connected to the inner wall of the fixed frame (14). A supplementary spring (28) is fixedly connected to the side wall of the compensation plate (42), and a fixed frame (14) is fixedly connected to the end of the supplementary spring (28). A lifting plate (25) is slidably connected to the inner wall of the fixed frame (14). The lifting plate (25) is connected to a lifting motor (24) via a rotating shaft (31). The rotating shaft (31) at the bottom of the lifting motor (24) is threadedly connected to the lifting plate (25). A connecting spring (22) is fixedly connected to the top of the lifting plate (25), and a slope block (23) is fixedly connected to the top of the connecting spring (22). A slot (29) is provided at the bottom of the locking plate (13), and the slot (29) is fitted onto the outer wall of the slope block (23). A fixed frame (14) is slidably connected to the outer wall of the slope block (23), and a lifting motor (24) is fixedly installed inside the fixed frame (14).

3. The redundant locking device for a failed reverse-force boosting hydraulic-gas synergistic vertical shaft explosion-proof cover according to claim 2, characterized in that: The inner wall of the locking plate (13) is slidably connected to a baffle (16), the outer wall of the baffle (16) is slidably connected to a fixing frame (14), an electric push rod (21) is fixedly installed inside the fixing frame (14), a stop block (20) is fixedly connected to the output end of the electric push rod (21), a wedge block one (17) is fixedly connected to the side wall of the baffle (16), the bottom slope of the wedge block one (17) is in contact with the top slope of the wedge block two (19), the outer walls of the wedge block one (17) and the wedge block two (19) are slidably connected to a locking plate (13), the bottom of the side plates (26) on both sides of the wedge block two (19) is fixedly connected to a compression spring (18), and the bottom of the compression spring (18) is fixedly connected to a locking plate (13).

4. The redundant locking device for a failed reverse-force boosting hydraulic-gas synergistic vertical shaft explosion-proof cover according to claim 1, characterized in that: The inner wall of the annular locking frame (7) is rotatably connected to a rotating rod (41), and the outer wall of the rotating rod (41) is fixedly connected to a bevel gear two (45). The side wall of the bevel gear two (45) is meshed with a bevel gear one (44). The bevel gear one (44) is connected to a rotating block (39) through a rotating shaft. The rotating block (39) is rotatably connected to the inner wall of the annular locking frame (7). The outer wall of the rotating rod (41) is connected to a pressing plate (40) through a thread. The top inclined surface of the pressing plate (40) is in contact with the inclined surface of the bottom pressing pad (38). The pressing pad (38) and the pressing plate (40) are slidably connected to the inner wall of the annular locking frame (7).

5. The redundant locking device for a failed reverse-force boosting hydraulic-gas synergistic vertical shaft explosion-proof cover according to claim 3, characterized in that: The outer wall of the second wedge block (19) is symmetrically fixed with a side plate (26), the outer wall of the side plate (26) is slidably connected with a locking plate (13), the inner wall of the locking plate (13) is slidably connected with a limit plate (27), the limit plate (27) is symmetrically fixed to the outer wall of the first wedge block (17), the bottom of the inner wall of the fixing frame (14) is provided with a sliding groove (30), and the side wall of the sliding groove (30) is slidably connected with a baffle (16).

6. The redundant locking device for a failed reverse-force boosting hydraulic-gas synergistic vertical shaft explosion-proof cover according to claim 1, characterized in that: The piston plate (37) is slidably connected to the inner wall of the piston cylinder (3). The piston plate (37) divides the inside of the piston cylinder (3) into a forward cavity (35) and a reverse cavity (34). The piston rod (9) extends from one end of the piston cylinder (3). The forward cavity (35) is located on the side of the piston plate (37) where the piston rod (9) is located, and the reverse cavity (34) is located on the side of the piston plate (37) where the piston rod (9) is not located. Pressure relief valves are respectively provided on the forward cavity (35) and the reverse cavity (34) of the piston cylinder (3). The control end of the pressure relief valve on the forward cavity (35) and the reverse cavity (34) is connected to the control circuit of the hydraulic pump (4) through a signal line. The hydraulic pump (4) is connected to the oil tank (8) through a pipeline. The side of the piston cylinder (3) connected to the commutator (33) is connected to the air pump (6) through a pipeline.

7. The redundant locking device for a failed reverse-force boosting hydraulic-gas synergistic vertical shaft explosion-proof cover according to claim 1, characterized in that: The control terminals of commutator 1 (32) and commutator 2 (33) are connected to the control circuit of hydraulic pump (4) via signal lines. A pressure sensor is installed in the connecting pipe between commutator 1 (32) and piston cylinder (3). The control circuits of air pump (6) and hydraulic pump (4) are connected to the pressure sensor via signal lines. The control terminals of the pressure relief valves on the forward chamber (35) and reverse chamber (34) are connected to the control circuit of air pump (6) via signal lines.

8. The redundant locking device for a failed reverse-force boosting hydraulic-gas synergistic vertical shaft explosion-proof cover according to claim 7, characterized in that: A one-way valve is provided on the connecting pipe between the first commutator (32) and the second commutator (33) to allow the medium to flow from the second commutator (33) to the first commutator (32). A one-way valve is provided on the connecting pipe between the second commutator (33) and the piston cylinder (3) to allow the medium to flow from the second commutator (33) to the piston cylinder (3).

9. The redundant locking device for a failed reverse-force boosting hydraulic-gas synergistic vertical shaft explosion-proof cover according to claim 1, characterized in that: The base (1) is provided with a placement rack (15) on top. The accumulator (5) and the air pump (6) are fixedly installed on the placement rack (15). The piston rod (9) is fixedly connected to a connecting plate (10) at one end away from the piston plate (37). The moving block (12) is slidably connected to the inner wall of the fixed frame (14).

10. A redundant locking device for a failed reverse-force boosting hydraulic-gas synergistic vertical shaft explosion-proof cover according to claim 4, characterized in that: The inner wall of the ring locking frame (7) is detachably connected to a disassembly plate (36), which is fixed to the ring locking frame (7) by bolts (43).

Images