Adjustable quick-opening blind door opening mechanism

Abstract

This invention relates to the field of quick-opening blind flange technology, specifically an adjustable quick-opening blind flange opening mechanism. It includes a high neck tube, a blind flange cover sealed to the end face of the high neck tube, and a protective cover fixed to the upper outer side of the high neck tube. By setting an isolation drive component, it can effectively seal the channel after the interlocking screw body is removed from the insertion hole, preventing external dust, rust, and other impurities from entering the threaded mounting hole and interlocking screw hole. This reduces thread jamming and thread surface damage during subsequent reinstallation, ensuring the pressure sensing sensitivity and protective reliability of the interlocking mechanism. The sealing action is automatically triggered when the screw is removed, requiring no additional manual operation. This avoids the problems of missed sealing on-site and loss of independent sealing spare parts. The circular threaded block can be unscrewed and replaced as a whole without disassembling the main blind flange device, simplifying maintenance and operation. While retaining the quick-opening and closing performance of the quick-opening connection device, it effectively improves the automation level of interlocking hole protection and the long-term operational reliability of the device.

Description

Technical Field

[0001] This invention relates to the field of quick-opening blind panel technology, specifically to an adjustable quick-opening blind panel door opening mechanism. Background Technology

[0002] Quick-opening blind flanges are flange-type quick-opening connection devices widely used in the rapid opening and closing of various pressure vessels and process pipelines. They are a core component of the quick-opening connection structure for pressure equipment. Existing conventional quick-opening blind flanges mainly consist of a high-neck flange fixed to the equipment port, a flip-openable blind flange cover, a single-sided hinged opening mechanism, a circumferential locking assembly, and a safety interlock mechanism. The hinged opening mechanism achieves the rotational opening and closing of the blind flange cover through hinge seats, hinge bodies, and hinge shafts fixed to the flange and blind flange cover respectively. An axial adjustment component is provided to compensate for manufacturing and assembly deviations. The safety interlock mechanism uses an interlocking screw that engages with the corresponding threaded hole on the flange side to achieve pressurized locking protection and pressure relief status confirmation. The overall structure is designed around the core functions of rapid opening and closing and pressure sealing.

[0003] The existing quick-opening blind flange's safety interlocking screw is a detachable structure. During maintenance, after removing the interlocking screw, the corresponding threaded mounting holes on the flange and blind flange cover are directly open. During prolonged maintenance with the cover open, dust, rust, anti-corrosion paint, and other impurities in the environment can easily enter the channel. When reinstalling the interlocking screw, these impurities can easily become stuck on the threaded mating surfaces, causing rotational jamming, thread damage, or even seizing. Furthermore, impurities deposited at the bottom of the channel can interfere with pressure sensing sensitivity, leading to interlock protection failure and directly affecting the reliability and operational safety of the quick-opening connection device. Current technology often uses independent rubber plugs for temporary sealing of the orifice. These plugs are small and easily lost, and rely entirely on manual operation, often resulting in missed sealing during field work. They also fail to automatically trigger protection upon removal of the interlocking screw, exhibiting significant deficiencies in both protection reliability and operational convenience. Summary of the Invention

[0004] The purpose of this invention is to provide an adjustable quick-opening blind flange opening mechanism to solve the problems mentioned in the background art. The safety interlock screw of the existing quick-opening blind flange is a detachable structure. After maintenance, the corresponding threaded mounting hole is directly open. Dust, rust, paint and other impurities in the environment can easily enter the channel, causing the thread to jam, be pulled or even seize during reinstallation. It can also reduce the pressure sensing sensitivity, cause the interlock function to fail, and affect the reliability and safety of equipment use.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an adjustable quick-opening blind flange door opening mechanism, comprising a high neck tube, a blind flange cover sealed and fitted to the end face of the high neck tube, and a protective cover fixed to the upper outer side of the high neck tube. A switch screw is inserted through and rotatably installed in the middle of the protective cover. A fixing seat is fixedly installed in the middle of one side of the high neck tube. Hinges are symmetrically fixed to the outside of the fixing seat and the blind flange cover. A safety interlocking plate is provided between the blind flange cover and the protective cover. An interlocking screw body is installed through both ends of the safety interlocking plate. Threaded mounting holes and interlocking screw holes are coaxially opened in the blind flange cover and the protective cover at the positions corresponding to the interlocking screw bodies, respectively. Circular threaded blocks are threadedly connected in the threaded mounting holes. An insertion hole is coaxially opened in the middle of the circular threaded block. An annular mounting cavity is opened inside the circular threaded block. Several sets of isolation drive components are arranged in the annular mounting cavity. A liquid injection component is correspondingly arranged on one side of each set of isolation drive components.

[0006] Furthermore, a hinge body is provided between the hinge seat on the fixed seat and the hinge seat on the blind plate cover. Both ends of the hinge body are fixed with bearing sleeves. A rotating arm shaft is fixedly installed on the hinge seat on the fixed seat side. The bearing sleeve at the corresponding end of the hinge body is rotatably sleeved on the outside of the rotating arm shaft.

[0007] Furthermore, an adjustment shaft is provided through the hinge seat on the side of the blind plate cover. The adjustment shaft passes through the bearing sleeve on the corresponding side. A fine-tuning nut is threaded to the outer wall of the bottom end of the adjustment shaft. A handle is fixedly installed in the middle of the side of the blind plate cover away from the hinge seat.

[0008] Furthermore, the isolation drive assembly includes an arc-shaped abutment block and a limiting slider. The arc-shaped abutment block is disposed in the insertion hole, with one end sliding radially into the annular mounting cavity. The limiting slider is fixed to the bottom of the end of the arc-shaped abutment block that extends into the annular mounting cavity.

[0009] Furthermore, two limiting guide rods are symmetrically and slidably installed inside the limiting slider, and both ends of the limiting guide rods are fixedly installed on the inner wall of the annular mounting cavity.

[0010] Furthermore, a limiting groove is provided through the bottom end of the annular mounting cavity near the limiting slider, and the bottom end of the limiting slider extends through the limiting groove to the outer side of the bottom end of the circular threaded block.

[0011] Furthermore, several fan-shaped sealing blocks are arranged around the outer side of the insertion hole near the interlocking screw hole, and the bottom end of the limiting slider is fixedly connected to one of the fan-shaped sealing blocks on the corresponding side.

[0012] Furthermore, an annular oil storage cavity is formed inside the top of the circular threaded block, and an oil filling cap is sealed and snapped onto the top of the annular oil storage cavity; the liquid injection assembly includes a mounting frame and a liquid collection cylinder, the mounting frame is fixedly installed on the inner wall of the annular mounting cavity away from the arc-shaped contact block, the liquid collection cylinder is fixedly installed on the outside of the mounting frame, and a piston rod is provided on the side of the liquid collection cylinder near the arc-shaped contact block, and the piston end of the piston rod is slidably and sealed inside the liquid collection cylinder.

[0013] Furthermore, the end of the piston rod away from the liquid collecting cylinder is fixedly installed on the outside of one side of the arc-shaped contact block. A compression spring is sleeved on the outside of the piston rod. The two ends of the compression spring are respectively fixedly installed on the outside of one side of the liquid collecting cylinder and the outside of one side of the arc-shaped contact block. The end of the liquid collecting cylinder away from the piston rod is fixedly connected to a one-way liquid inlet valve pipe and a one-way liquid outlet valve pipe. The input end of the one-way liquid inlet valve pipe is sealed and passes through the inside of the annular oil storage chamber and is connected to it.

[0014] Furthermore, several supporting cantilever arms are fixed around the bottom end of the circular threaded block, and an mounting ring is fixed at one end of each of the supporting cantilever arms near one of the fan-shaped sealing blocks. A sponge ring is fixed inside the mounting ring, and the output end of the one-way drain valve pipe passes through the limiting groove and the mounting ring and extends into the sponge ring.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. By setting a circular threaded block with a built-in isolation drive component and installing it inside the threaded mounting hole, after the interlocking screw body is removed from the insertion hole, the compression spring rebounds and drives the arc-shaped contact block and the fan-shaped sealing block to retract synchronously, effectively sealing the channel and preventing external dust, rust, and other impurities from entering the threaded mounting hole and the interlocking screw hole. This reduces thread jamming and thread tooth surface damage during subsequent reinstallation, ensuring the pressure sensing sensitivity and protection reliability of the interlocking mechanism. The sealing action is automatically triggered when the screw is removed, requiring no additional manual operation. This avoids the problems of missed sealing on site and loss of independent sealing spare parts. The circular threaded block can be unscrewed and replaced as a whole without disassembling the main blind plate device, making maintenance and operation simple. While retaining the quick opening and closing performance of the quick-opening connection device, it effectively improves the automation level of the interlocking hole protection and the long-term operational reliability of the device.

[0016] 2. The liquid injection assembly of this invention uses the insertion and extraction action of the interlocking screw body as the power source. The piston rod is driven to reciprocate in the liquid collection cylinder through the arc-shaped contact block. With the cooperation of the one-way liquid inlet valve pipe and the one-way liquid outlet valve pipe, the lubricating medium is sucked up and quantitatively discharged. The lubricating medium is delivered to the inside of the sponge ring on the inner side of the mounting ring, so that the lubricating medium is evenly attached to the outer wall thread during the screwing of the interlocking screw body, reducing the frictional resistance of the thread engagement, reducing the wear of the thread surface, and forming a protective oil film to slow down the erosion of the thread surface by the corrosive medium, thus extending the service life of the thread pair. The annular oil storage chamber can store a sufficient amount of lubricating medium, and the top oil filling cap is easy to open and add later. The overall structure does not require an external power source or additional operating steps. Lubrication is completed synchronously with the opening and closing of the blind flange. Without increasing the complexity of operation, the maintenance convenience and long-term operation stability of the quick-opening connection device are further improved. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a three-dimensional structural diagram of the blind flange cover and protective cover of the present invention; Figure 3 For the present invention Figure 1 Enlarged structural diagram at point A in the middle; Figure 4 This is a partial cross-sectional three-dimensional structural diagram of the interlocking screw hole and the circular threaded block of the present invention; Figure 5 This is a bottom-view perspective view of the three-dimensional structure of the circular threaded block and the sector-shaped sealing block of the present invention. Figure 6 This is a partial cross-sectional perspective view of the three-dimensional structure of the circular threaded block and the arc-shaped contact block of the present invention; Figure 7 This is a three-dimensional structural diagram of the mounting bracket and liquid collecting cylinder of the present invention; Figure 8 This is a three-dimensional structural diagram of the mounting ring and sponge ring of the present invention; Figure 9 For the present invention Figure 6 Enlarged structural diagram at point B; Figure 10 For the present invention Figure 6 Enlarged structural diagram at point C.

[0018] In the attached diagram, the components represented by each number are as follows: 1. High neck tube; 2. Blind plate cover; 3. Protective cover; 4. Switch screw; 5. Fixed base; 6. Hinge seat; 7. Hinge body; 8. Rotary arm shaft; 9. Bearing sleeve; 10. Adjusting shaft; 11. Fine-tuning nut; 12. Handle; 13. Safety interlock plate; 14. Threaded mounting hole; 15. Interlocking screw hole; 16. Circular threaded block; 17. Insertion hole; 18. Annular mounting cavity ; 19. Arc-shaped contact block; 20. Limiting guide rod; 21. Limiting slider; 22. Limiting groove; 23. Fan-shaped sealing block; 24. Annular oil storage chamber; 25. Oil filling cap; 26. Interlocking screw body; 27. Mounting bracket; 28. Liquid collecting cylinder; 29. ​​Piston rod; 30. Compression spring; 31. One-way liquid inlet valve pipe; 32. One-way liquid outlet valve pipe; 33. Support cantilever; 34. Mounting ring; 35. Sponge ring. Detailed Implementation

[0019] 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.

[0020] Example 1: Please refer to Figures 1-7 An adjustable quick-opening blind flange door mechanism includes a high neck tube 1, a blind flange cover 2 sealed to the end face of the high neck tube 1, and a protective cover 3 fixed to the upper outer side of the high neck tube 1. A switch screw 4 is inserted through and rotatably installed in the middle of the protective cover 3. A fixing seat 5 is fixedly installed in the middle of one side of the high neck tube 1. Hinges 6 are symmetrically fixed to the outside of the fixing seat 5 and the blind flange cover 2. A safety interlock plate 13 is provided between the blind flange cover 2 and the protective cover 3. An interlocking screw body 26 is installed through both ends of the safety interlock plate 13. Threaded mounting holes 14 and interlocking screw holes 15 are coaxially opened in the blind flange cover 2 and the protective cover 3 respectively, corresponding to the positions of the interlocking screw bodies 26. Circular threaded blocks 16 are threadedly connected in the threaded mounting holes 14. An insertion hole 17 is coaxially opened in the middle of the circular threaded block 16. An annular mounting cavity 18 is opened inside the circular threaded block 16. Several sets of isolation drive components are provided in the annular mounting cavity 18.

[0021] A hinge body 7 is provided between the hinge seat 6 on the fixed seat 5 and the hinge seat 6 on the blind plate cover 2. Both ends of the hinge body 7 are fixed with bearing sleeves 9. A rotating arm shaft 8 is fixedly installed on the hinge seat 6 on the side of the fixed seat 5. The bearing sleeve 9 at the corresponding end of the hinge body 7 is rotatably sleeved on the outside of the rotating arm shaft 8.

[0022] An adjustment shaft 10 is provided through the hinge seat 6 on the side of the blind plate cover 2. The adjustment shaft 10 passes through the bearing sleeve 9 on the corresponding side. A fine-tuning nut 11 is threaded to the outer wall of the bottom end of the adjustment shaft 10. A handle 12 is fixedly installed in the middle of the side of the blind plate cover 2 away from the hinge seat 6.

[0023] The isolation drive assembly includes an arc-shaped abutment block 19 and a limiting slider 21. The arc-shaped abutment block 19 is disposed in the insertion hole 17, and one end of it slides radially into the annular mounting cavity 18. The limiting slider 21 is fixed to the bottom of the end of the arc-shaped abutment block 19 that extends into the annular mounting cavity 18.

[0024] Two limiting guide rods 20 are symmetrically slidably installed inside the limiting slider 21, and both ends of the limiting guide rods 20 are fixedly installed on the inner wall of the annular mounting cavity 18.

[0025] A limiting groove 22 is provided through the bottom end of the annular mounting cavity 18 near the limiting slider 21, and the bottom end of the limiting slider 21 extends through the limiting groove 22 to the outer side of the bottom end of the circular threaded block 16.

[0026] Several sector-shaped sealing blocks 23 are arranged around the outer side of the insertion hole 17 near the interlocking screw hole 15, and the bottom end of the limiting slider 21 is fixedly connected to a sector-shaped sealing block 23 on the corresponding side.

[0027] In this embodiment, when the blind flange cover 2 needs to be aligned, rotating the fine-tuning nut 11 drives the adjusting shaft 10 to move axially through the transmission of the threaded pair. This causes the bearing sleeve 9 on the corresponding side and the end of the hinge body 7 to move axially in sync, thereby adjusting the axial alignment of the blind flange cover 2 relative to the end face of the high neck tube 1. This adjustment structure can effectively compensate for welding deformation caused by welding the high neck tube 1 to the cylinder, the machining dimensional deviations of various components, and the positional deviations caused by on-site assembly. This ensures that the blind flange cover 2 maintains good coaxiality with the end face of the high neck tube 1 when closed, ensuring uniform distribution of circumferential compression of the sealing surface, reducing local over-compression or under-compression of the sealing ring, reducing the probability of seal failure due to uneven wear, and improving the sealing stability and service life of the quick-opening connection structure.

[0028] When the equipment needs to be opened for maintenance, first depressurize the inside of the container. After confirming that the internal pressure has dropped to a safe range through the on-site pressure monitoring device, use a tool to rotate the switch screw 4 in the middle of the protective cover 3. Through the screw drive, the existing circumferentially arranged three-lobed clamp structure is slowly opened, so that the inner conical surface of the clamp gradually separates from the mating conical surface of the high neck tube 1 and the outer side of the blind plate cover 2, thus completing the unlocking operation of the locking structure.

[0029] After the locking structure is unlocked, the interlocking screw bodies 26 on both sides are unscrewed in sequence, and the safety interlocking plate 13 is removed simultaneously. After the interlocking screw body 26 is completely withdrawn from the insertion hole 17 in the middle of the circular threaded block 16, the arc-shaped abutment block 19 loses the external force contact at the end of the screw, and the compression spring 30, which was previously compressed, gradually rebounds and resets, pushing the arc-shaped abutment block 19 to slide along the guide of the limiting guide rod 20 towards the center of the insertion hole 17; during the sliding process, the limiting slider 21 at the bottom of the arc-shaped abutment block 19 moves synchronously along the limiting slide groove 22, thereby driving the fan-shaped sealing block 23 connected to the bottom end of the limiting slider 21 to converge synchronously towards the central axis of the insertion hole 17. After multiple sets of fan-shaped sealing blocks 23 cooperate with each other, they can effectively block the lower end channel of the insertion hole 17.

[0030] This sealing structure prevents solid impurities such as dust, rust, and anti-corrosion paint from entering the threaded mounting hole 14 and the interlocking screw hole 15. This reduces the likelihood of impurities getting stuck on the threaded mating surface during subsequent reinstallation of the interlocking screw body 26, lowering the probability of thread jamming, thread tooth surface damage, or even seizing. Simultaneously, it reduces the accumulation of impurities on the pressure sensing end face at the bottom of the channel, preventing impurity deposits from interfering with pressure sensing sensitivity and ensuring the stable and reliable pressurized locking protection function of the interlocking mechanism. The sealing action is automatically triggered upon removal of the interlocking screw body 26, eliminating the need for manual sealing operations. This prevents on-site personnel from missing sealing points, eliminates the need for separate sealing spare parts, and avoids the problem of lost spare parts. The operation is highly convenient and suitable for fast-paced on-site maintenance needs.

[0031] After the interlocking structure is completely released, the operator holds the handle 12 and applies a flipping force. The blind cover 2 can then smoothly flip outward via the hinge body 7 around the axis of the rotating arm shaft 8, achieving rapid opening. This allows the operator to enter the container to carry out maintenance, cleaning, filter replacement, and other operations. The bearing sleeve 9 on the hinge side reduces frictional resistance during rotation, making the opening operation smoother. It also reduces wear on the hinge shaft, maintains rotational accuracy after long-term use, and ensures the alignment accuracy of the blind cover 2 after repeated opening and closing.

[0032] After the maintenance work is completed, the closing operation is performed. First, push the handle 12 to drive the blind flange cover 2 to rotate in the opposite direction around the rotating arm shaft 8, so that the end face of the blind flange cover 2 and the high neck tube 1 are aligned and fitted. At the same time, use a tool to rotate the switch screw 4 in the middle of the cover 3. Through the screw drive, drive the existing circumferentially arranged three-lobed clamp structure to slowly retract, so that the inner conical surface of the clamp gradually fits the mating conical surface of the high neck tube 1 and the outer side of the blind flange cover 2. The axial clamping force is generated by the conical surface wedging, so as to achieve end face sealing. Then, place the safety interlock plate 13 in the corresponding installation position and insert the interlock screw body 26 into the insertion hole 17 in the middle of the circular threaded block 16. During insertion, the end of the interlocking screw body 26 abuts against the inner arc surface of the arc-shaped contact block 19, pushing the arc-shaped contact block 19 to retract into the annular mounting cavity 18 against the elastic force of the compression spring 30. At the same time as the arc-shaped contact block 19 retracts, the fan-shaped sealing block 23 is driven to spread outward in a synchronous manner through the bottom limiting slider 21, automatically avoiding the insertion and screwing path of the interlocking screw body 26, and will not interfere with the subsequent assembly of the screw.

[0033] This structure can automatically retract the sealing component during the assembly of the interlocking screw body 26, without affecting the normal installation and interlocking function of the original interlocking screw. The sealing mechanism is integrated inside the circular threaded block 16. After a period of use, if the internal isolation drive component suffers wear, jamming, or other damage, the circular threaded block 16 can be replaced separately. Disassembly only requires the use of conventional tools on site. Insert the tool tip into the pre-drilled positioning hole on the edge of the circular threaded block 16, and rotate the tool to drive the circular threaded block 16 to rotate synchronously. The circular threaded block 16 is separated from the threaded mounting hole 14 by the threaded engagement. There is no need to remove the main devices such as the high neck pipe 1, blind flange cover 2, and protective cover 3. The automatic dustproof protection capability of the interlocking hole can be restored by replacing only a single damaged component. The maintenance and replacement steps are simple and convenient for on-site operation. At the same time, while retaining the adjustable centering function and ensuring the sealing performance of the quick-opening connection, the overall mechanism realizes the automatic dustproof protection of the interlocking hole, effectively improving the ease of operation and long-term reliability of the quick-opening connection device, and is suitable for quick-opening connection application scenarios of various pressure pipelines and pressure vessels.

[0034] Example 2: Please refer to Figures 5-10 This embodiment further illustrates Example 1, wherein each group of isolation drive components is provided with a corresponding liquid injection component on one side.

[0035] An annular oil storage cavity 24 is provided inside the top of the circular threaded block 16, and an oil filling cap 25 is sealed and snapped onto the top of the annular oil storage cavity 24. The liquid injection assembly includes a mounting frame 27 and a liquid collection cylinder 28. The mounting frame 27 is fixedly installed on the inner wall of the annular mounting cavity 18 away from the arc-shaped contact block 19. The liquid collection cylinder 28 is fixedly installed on the outside of the mounting frame 27. A piston rod 29 is provided on the side of the liquid collection cylinder 28 near the arc-shaped contact block 19. The piston end of the piston rod 29 is slidably and sealed inside the liquid collection cylinder 28.

[0036] The piston rod 29 is fixedly installed on the outside of one side of the arc-shaped contact block 19 at one end away from the liquid collecting cylinder 28. A compression spring 30 is sleeved on the outside of the piston rod 29. The two ends of the compression spring 30 are fixedly installed on the outside of one side of the liquid collecting cylinder 28 and the outside of one side of the arc-shaped contact block 19, respectively. The end of the liquid collecting cylinder 28 away from the piston rod 29 is fixedly connected to a one-way liquid inlet valve pipe 31 and a one-way liquid outlet valve pipe 32. The input end of the one-way liquid inlet valve pipe 31 is sealed and passes through the inside of the annular oil storage chamber 24 and is connected to it.

[0037] Several supporting cantilever arms 33 are fixed around the bottom of the circular threaded block 16. An installation ring 34 is fixed at one end of the supporting cantilever arms 33 near one end of the fan-shaped sealing blocks 23. A sponge ring 35 is fixed inside the installation ring 34. The output end of the one-way drain valve pipe 32 passes through the limiting slide groove 22 and the installation ring 34 and extends into the sponge ring 35.

[0038] In this embodiment, a liquid injection component is provided on the basis of the isolation drive component in Embodiment 1. The lubrication of the thread surface can be completed simultaneously during the insertion and removal of the interlocking screw body 26, without the need for manual addition of lubricating medium, which further improves the maintenance convenience of the quick-opening connection device and the smoothness of the threaded pair transmission.

[0039] When the interlocking screw body 26 is unscrewed from the insertion hole 17, the arc-shaped contact block 19 slides towards the center of the insertion hole 17 under the rebound force of the compression spring 30, simultaneously driving the piston rod 29 to extend outward along the inside of the liquid collecting cylinder 28. This increases the volume of the cavity inside the liquid collecting cylinder 28, creating a negative pressure state. The lubricating medium stored in the annular oil storage chamber 24 is drawn into the liquid collecting cylinder 28 through the one-way inlet valve pipe 31, completing one round of medium replenishment. The liquid collecting cylinder 28 is fixed to the inner wall of the annular mounting cavity 18 by the mounting bracket 27, ensuring a stable and reliable installation position. This guarantees the coaxiality of the piston rod 29 during extension and retraction, reduces wear on the piston seal, and maintains the long-term working accuracy of the injection assembly.

[0040] When the interlocking screw body 26 is reinserted into the insertion hole 17, the screw end pushes the arc-shaped contact block 19 to retract into the annular mounting cavity 18, causing the piston rod 29 to slide into the liquid collecting cylinder 28, squeezing the internal cavity and increasing the medium pressure. The lubricating medium in the liquid collecting cylinder 28 is discharged outward through the one-way drain valve pipe 32, and after passing through the limiting slide groove 22 and the mounting ring 34 along the pipeline, it is transported to the inside of the sponge ring 35, so that the sponge ring 35 is evenly wetted with the lubricating medium.

[0041] The mounting ring 34 is fixed to the bottom end of the circular threaded block 16 by the circumferentially arranged support cantilever 33 and is coaxially arranged with the insertion hole 17, which allows the inner ring of the sponge ring 35 to fit evenly against the outer wall of the interlocking screw body 26. During the continuous screwing of the interlocking screw body 26, the outer thread surface of the wall is in full contact with the wetted sponge ring 35, and the lubricating medium is evenly attached to the thread surface, which can effectively reduce the frictional resistance during the thread engagement process, reduce the wear of the thread tooth surface, reduce the occurrence of jamming and scoring failures, and at the same time form a protective oil film on the thread surface, reduce the erosion of the thread surface by water vapor and corrosive media, and extend the service life of the interlocking screw body 26 and the threaded mounting hole 14.

[0042] The oil filling cap 25 at the top of the annular oil reservoir 24 can be opened and removed. When the lubricating medium in the cavity is insufficient, the oil filling cap 25 can be opened directly for replenishment without disassembling the entire circular threaded block 16, making maintenance and operation simple. This fluid injection assembly uses the insertion and removal action of the interlocking screw body 26 as a power source. Without the need for an external power source or additional operating steps, it can achieve lubrication replenishment simultaneously with each opening and closing operation, keeping the threaded pair in a smooth transmission state for a long time. It is suitable for application scenarios where quick-opening blind flanges are frequently opened and closed and on-site maintenance conditions are limited, improving the long-term operational reliability of the quick-opening connection device without increasing operational complexity.

Claims

1. An adjustable quick-opening blind flange door opening mechanism, comprising a high neck tube (1), a blind flange cover (2) sealed and fitted to the end face of the high neck tube (1), and a protective cover (3) fixed to the upper outer side of the high neck tube (1), characterized in that: A switch screw (4) is inserted through and rotatably installed in the middle of the protective cover (3), and a fixed seat (5) is fixedly installed in the middle of one side of the high neck tube (1). The fixed seat (5) and the blind plate cover (2) are symmetrically fixed with hinge seats (6). A safety interlock plate (13) is provided between the blind plate cover (2) and the protective cover (3). Both ends of the safety interlock plate (13) are internally installed with interlock screw bodies (26). The blind plate cover (2) and the protective cover (3) are respectively provided with threaded mounting holes (14) and interlock screw holes (15) on the inside corresponding to the positions of the interlock screw bodies (26). Each of the threaded mounting holes (14) is threaded with a circular threaded block (16). The center of the circular threaded block (16) is coaxially provided with an insertion hole (17). The circular threaded block (16) is provided with an annular mounting cavity (18). The annular mounting cavity (18) is provided with several sets of isolation drive components. Each set of isolation drive components is provided with a liquid injection component on one side.

2. The adjustable quick-opening blind plate door opening mechanism according to claim 1, characterized in that: A hinge body (7) is provided between the hinge seat (6) on the fixed seat (5) and the hinge seat (6) on the blind plate cover (2). Both ends of the hinge body (7) are fixed with bearing sleeves (9). A rotating arm shaft (8) is fixedly installed on the hinge seat (6) on the side of the fixed seat (5). The bearing sleeve (9) at the corresponding end of the hinge body (7) is rotatably sleeved on the outside of the rotating arm shaft (8).

3. The adjustable quick-opening blind door mechanism according to claim 2, characterized in that: An adjustment shaft (10) is provided through the hinge seat (6) on the side of the blind plate cover (2). The adjustment shaft (10) passes through the bearing sleeve (9) on the corresponding side. A fine-tuning nut (11) is threaded to the outer wall of the bottom end of the adjustment shaft (10). A handle (12) is fixedly installed in the middle of the side of the blind plate cover (2) away from the hinge seat (6).

4. The adjustable quick-opening blind door mechanism according to claim 1, characterized in that: The isolation drive assembly includes an arc-shaped abutment block (19) and a limiting slider (21). The arc-shaped abutment block (19) is disposed in the insertion hole (17), and one end of it slides radially into the annular mounting cavity (18). The limiting slider (21) is fixed to the bottom of the end of the arc-shaped abutment block (19) that extends into the annular mounting cavity (18).

5. The adjustable quick-opening blind door mechanism according to claim 4, characterized in that: The limiting slider (21) has two limiting guide rods (20) symmetrically slidably installed inside it. Both ends of the limiting guide rods (20) are fixedly installed on the inner wall of the annular mounting cavity (18).

6. The adjustable quick-opening blind door mechanism according to claim 5, characterized in that: The bottom end of the annular mounting cavity (18) near the limiting slider (21) is provided with a limiting groove (22), and the bottom end of the limiting slider (21) extends through the limiting groove (22) to the outer side of the bottom end of the circular threaded block (16).

7. An adjustable quick-opening blind door mechanism according to claim 6, characterized in that: Several fan-shaped sealing blocks (23) are arranged around the outer side of the insertion hole (17) near the interlocking screw hole (15), and the bottom end of the limiting slider (21) is fixedly connected to a fan-shaped sealing block (23) on the corresponding side.

8. The adjustable quick-opening blind door mechanism according to claim 7, characterized in that: The top of the circular threaded block (16) is provided with an annular oil storage cavity (24), and the top of the annular oil storage cavity (24) is sealed with an oil filling cap (25). The liquid injection assembly includes a mounting bracket (27) and a liquid collection cylinder (28). The mounting bracket (27) is fixedly installed on the inner wall of the annular mounting cavity (18) away from the arc-shaped contact block (19). The liquid collection cylinder (28) is fixedly installed on the outside of the mounting bracket (27). A piston rod (29) is provided on the side of the liquid collection cylinder (28) close to the arc-shaped contact block (19). The piston end of the piston rod (29) is slidably sealed inside the liquid collection cylinder (28).

9. An adjustable quick-opening blind door mechanism according to claim 8, characterized in that: The piston rod (29) is fixedly installed at one end away from the liquid collecting cylinder (28) on the outside of one side of the arc-shaped contact block (19). A compression spring (30) is sleeved on the outside of the piston rod (29). The two ends of the compression spring (30) are fixedly installed on the outside of one side of the liquid collecting cylinder (28) and the outside of one side of the arc-shaped contact block (19), respectively. The end of the liquid collecting cylinder (28) away from the piston rod (29) is fixedly connected to a one-way liquid inlet valve pipe (31) and a one-way liquid outlet valve pipe (32). The input end of the one-way liquid inlet valve pipe (31) is sealed and passes through the inside of the annular oil storage chamber (24) and is connected to it.

10. An adjustable quick-opening blind door mechanism according to claim 9, characterized in that: The bottom end of the circular threaded block (16) is fixed with several supporting cantilever arms (33). The supporting cantilever arms (33) are fixed with an installation ring (34) at one end near the several fan-shaped sealing blocks (23). A sponge ring (35) is fixed inside the installation ring (34). The output end of the one-way drain valve pipe (32) passes through the limiting slide groove (22) and the installation ring (34) and extends into the sponge ring (35).

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