Anti-falling bolt flange device, installation method, replacement method and equipment

Abstract

The invention discloses an anti-falling bolt flange device which comprises a first flange, a second flange, a bolt and a sleeve, the sleeve is connected to the surface, away from the second flange, of the first flange, and a through hole, an unthreaded hole and a threaded hole which are coaxial are formed in the sleeve, the first flange and the second flange correspondingly; the bolt sequentially penetrates into the sleeve and the first flange and is connected with the second flange in a matched mode through a thread pair so that the first flange and the second flange can be fixed, the bolt and the sleeve are limited through a limiting piece, and the bolt is used for limiting the relative position of the sleeve and the bolt when the bolt is separated from a threaded hole of the second flange. The anti-falling bolt flange device is reliable and reasonable in structural layout, can be remotely operated, has an anti-falling function and can be repeatedly disassembled and assembled. The invention further provides an installation method of the anti-falling bolt flange device, an equipment assembly replacement method and equipment.

Description

Technical Field

[0001] The present invention specifically relates to an anti-drop bolt flange device, an installation method, a replacement method and

[0002] equipment Background Art

[0003] Nuclear energy is a very important form of energy with the advantages of high efficiency, energy saving, environmental protection, safety, stability and reliability. It has been applied to military, power generation, heating, medical and other fields. However, the nuclear energy industry also has the characteristics of radioactivity. For example, the hot rooms of nuclear power plants or spent fuel reprocessing plants have high radioactivity. In this environment, personnel are not allowed to have close contact for a long time. Therefore, when designing equipment in a radioactive environment, the service life of the equipment must be considered, especially for some equipment or components that need to be replaced over a long distance (such as filter elements, pump cores, tank equipment that needs to have internal components replaced, and long-distance sealing structures for pipelines, etc.). This functional requirement must also be considered during the design process.

[0004] For equipment or components that need to be replaced over long distances, most current designs only consider issues such as equipment lifting, docking, and installation deviation, and there are no more specialized designs for the handling of fasteners. During the disassembly and assembly of the equipment, fasteners such as bolts are prone to falling off due to their slender structure, which will cause the equipment to be unable to be installed again, and the fallen bolts may also damage other equipment components. Summary of the invention

[0005] The inventors of the present invention discovered that the main reason why there is currently no effective anti-slip means for bolt fasteners is that the bolts need to remain removable during the disassembly and assembly of the equipment, that is, they need to be able to be repeatedly disassembled and installed through a remote operating mechanism, while the conventional one-time fixing means obviously do not take into account the subsequent disassembly and installation functions, and can neither guarantee removability nor interfere with the operation of the remote operating mechanism, resulting in the current equipment bolts being able to only be simply installed and connected. In addition, it is difficult to directly determine through the remote operating mechanism whether the conventional bolt fasteners have been disassembled into place, resulting in the fasteners being more likely to fall off.

[0006] Accordingly, the technical problem to be solved by the present invention is to provide an anti-dropping bolt flange device in view of the above-mentioned deficiencies in the prior art, the device has a reliable and reasonable structure layout, can be operated remotely, and has an anti-dropping function. The present invention also provides an installation method of the anti-dropping bolt flange device, a device component replacement method and a device.

[0007] The present invention provides an anti-detachment bolt flange device, comprising a first flange, a second flange, a bolt and a sleeve, wherein the sleeve is connected to the surface of the first flange away from the second flange, and the sleeve, the first flange and the second flange are respectively provided with a coaxial through hole, a light hole and a threaded hole, the bolt is sequentially inserted into the sleeve and the first flange and is adaptively connected to the second flange through a threaded pair to achieve fixation of the first flange and the second flange, and the bolt and the sleeve are limited by a limiting piece to limit the relative position of the sleeve and the bolt when the bolt is separated from the threaded hole of the second flange.

[0008] Furthermore, the through hole is a stepped hole that passes through the sleeve, and the sleeve is connected to the first flange with the end face of the large diameter section of the stepped hole. The limiter between the bolt and the sleeve includes an internal thread arranged on the small diameter section of the stepped hole, and the internal thread is adapted to the external thread of the threaded rod of the bolt.

[0009] Furthermore, the length of the threaded rod of the bolt is greater than the sum of the length of the light hole and the length of the large diameter section, so that the threaded rod is threadedly connected with the small diameter section when it is completely separated from the threaded hole.

[0010] Furthermore, the bolt is provided with an optical axis section, which is located between the threaded rod and the nut of the bolt. The diameter of the optical axis section is smaller than the thread minor diameter of the threaded rod, and the length is greater than the length of the small diameter section to avoid interfering with the end face of the nut tightening the sleeve.

[0011] Furthermore, the through hole is a stepped hole that passes through the sleeve, and the sleeve is connected to the first flange with the end face of the large diameter section of the stepped hole. The limiting member between the bolt and the sleeve includes a retaining ring, which is detachably sleeved on the outside of the threaded rod of the bolt, and the diameter of the retaining ring is larger than the diameter of the small diameter section of the stepped hole, and smaller than the diameter of the large diameter section and the diameter of the light hole.

[0012] Furthermore, the distance between the retaining ring installation position and the nut of the bolt is greater than the sleeve length to avoid interference with the installation of the retaining ring, and is smaller than the sum of the sleeve length and the light hole length so that the retaining ring is located in the light hole when the nut is tightened against the sleeve end face.

[0013] Furthermore, the distance between the retaining ring installation position and the end of the threaded rod is smaller than the sum of the light hole length and the large diameter section length, so that the retaining ring can be pressed against the step surface of the stepped hole when the threaded rod is completely out of the threaded hole.

[0014] Furthermore, the retaining ring is sleeved on the outside of the threaded rod and is detachably connected to the threaded rod via a fastener that radially penetrates the retaining ring and penetrates into the threaded rod.

[0015] Furthermore, the device also includes a gasket, which is arranged between the first flange and the second flange.

[0016] The present invention also provides a method for installing an anti-dropout bolt flange device, which is used to install the anti-dropout bolt flange device, and the method comprises the following steps:

[0017] Butt joint the first flange with the second flange;

[0018] The sleeve is sleeved onto the outside of the bolt and is limited by a limiting piece;

[0019] Attach the sleeve with bolts to the first flange;

[0020] Tighten the bolts until they fit the second flange and continue tightening until the torque reaches the set value.

[0021] The present invention also provides a demister device, including a head, a cylinder, a filter core and the above-mentioned anti-detachment bolt flange device, the filter core is located in the inner cavity of the cylinder, the head is used to close the inner cavity opening of the cylinder, the first flange and the second flange in the anti-detachment bolt flange device are respectively arranged at the edges where the head and the cylinder are butted against each other, and the connection between the head and the cylinder is achieved by bolts and sleeves.

[0022] The present invention also provides a method for replacing an equipment component, which is used to replace an equipment component, wherein the equipment is connected using the above-mentioned anti-drop bolt flange device, and the method comprises the following steps:

[0023] Through remote operation, the bolts of the equipment are separated from the second flange, and the sleeve and the bolts are limited by the limiting piece;

[0024] Lift the equipment setting part away through remote operation;

[0025] After completing the replacement of equipment components through remote operation, reset the equipment settings;

[0026] The bolts are tightened by remote operation to make them fit and connect with the second flange, and the tightening is continued until the torque reaches the set value.

[0027] The present invention provides an anti-drop bolt flange device, which realizes the installation connection of the equipment by flange docking and bolt connection. Compared with the conventional bolt connection, the present device is additionally provided with a sleeve structure, and the sleeve is limited by a limiter between the sleeve and the bolt. In the two flanges where the light hole is provided and the threaded hole is provided, the sleeve is connected to the flange where the light hole is provided (i.e., the first flange), and is provided with a through hole allowing the bolt to pass through. When connected, the threaded rod of the bolt cooperates with the threaded hole, and the nut presses against the end face of the sleeve, so that the first flange is pressed against the second flange through the sleeve to realize the connection; when disassembled, the threaded rod of the bolt is separated from the threaded hole of the second flange, and the limiter limits the relative position of the sleeve and the bolt.

[0028] It can be seen that the device provides a basis for the bolt anti-slip solution through the additional sleeve structure, and the sleeve structure is set at this reasonable position, which will not affect the disassembly and assembly of the bolts, and will not affect the docking and separation between the first flange and the second flange; and precisely because the sleeve is connected to the first flange, the bolts are always connected to the equipment body through the sleeve during the disassembly and assembly of the component equipment to be replaced, and the integrity is strong, and no specific planning is required to place the bolts themselves, which facilitates the replacement operation and the tightening operation of the remote operation mechanism.

[0029] More importantly, the limiter limits the relative position of the sleeve and the bolt when the threaded rod is separated from the threaded hole of the second flange. This setting structure not only effectively limits the bolt from falling off the flange, providing a reliable anti-falling solution; it also fixes the position of the bolt itself by limiting the relative position, greatly reducing the difficulty of alignment before subsequent installation and screwing, and the screwing action can be completed conveniently and quickly even if a remote operating mechanism is used; at the same time, it provides a basis for whether the disassembly is completed. Whether the sleeve and the bolt have completed the limit can reversely infer whether the threaded rod is separated from the second flange. Even if a remote operating mechanism is used, an accurate judgment can be made on whether the disassembly is in place. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic structural diagram of the anti-drop bolt flange device in Example 1 of the present invention;

[0031] Figure 2 It is a schematic diagram of the installation of the anti-drop bolt flange device in Example 1 of the present invention;

[0032] Figure 3 This is a schematic diagram of disassembling the anti-drop bolt flange device in Example 1 of the present invention. In the figure: 1, first flange; 11, light hole; 2, second flange; 21, threaded hole; 3, bolt; 31, threaded rod; 32, nut; 33, light axis section; 4, sleeve; 41, large diameter section; 42, small diameter section; 5, retaining ring; 51, fastener; 6, gasket; 7, head; 8, cylinder. DETAILED DESCRIPTION

[0033] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of the present invention.

[0034] In the description of the present invention, it should be noted that the terms "upper", "lower" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience and simplification of the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0035] In the description of the present invention, the terms “first”, “second” and “third” are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connect", "set", "install", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0037] Example 1

[0038] like Figures 1 to 3 As shown, the anti-dropping bolt flange device of this embodiment includes a first flange 1, a second flange 2, a bolt 3 and a sleeve 4. The sleeve 4 is connected to the surface of the first flange 1 away from the second flange 2. The sleeve 4, the first flange 1 and the second flange 2 are respectively provided with a coaxial through hole, a light hole 11 and a threaded hole 21. The bolt 3 sequentially penetrates the sleeve 4 and the first flange 1 and is adapted to be connected with the second flange 2 through a threaded pair to achieve fixation of the first flange 1 and the second flange 2. The bolt 3 and the sleeve 4 are limited by a limiting member to limit the relative position of the sleeve 4 and the bolt 3 when the bolt 3 is separated from the threaded hole 21 of the second flange 2.

[0039] The anti-drop bolt flange device of this embodiment realizes the installation connection of the equipment by flange docking and bolt connection. Compared with the conventional bolt connection, the present device is additionally provided with a sleeve 4 structure, and the sleeve 4 is limited by a limiter between the sleeve 4 and the bolt 3. In the two flanges with the light hole 11 and the threaded hole 21, the sleeve 4 is connected to the flange in which the light hole 11 is provided (i.e., the first flange 1), and is provided with a through hole allowing the bolt 3 to pass through. When connected, the threaded rod 31 of the bolt 3 cooperates with the threaded hole 21, and the nut 32 presses against the end face of the sleeve 4, so that the first flange 1 is pressed against the second flange 2 through the sleeve 4 to realize the connection; when disassembled, the threaded rod 31 of the bolt 3 is separated from the threaded hole 21 of the second flange 2, and the limiter limits the relative position of the sleeve 4 and the bolt 3.

[0040] It can be seen that the device provides a basis for realizing the anti-slip solution of the bolt 3 through the additionally arranged sleeve 4 structure, and the sleeve 4 structure is arranged at this reasonable position, which will not affect the disassembly and assembly of the bolt 3, and will not affect the docking and separation between the first flange 1 and the second flange 2; and precisely because the sleeve 4 is connected to the first flange 1, the bolt 3 is always connected to the equipment body through the sleeve 4 during the disassembly and assembly of the component equipment to be replaced, and the integrity is relatively strong, and no specific planning is required to place the bolt 3 itself, so it is convenient for replacement operation, convenient for the tightening operation of the remote operation mechanism, and can be repeatedly disassembled and assembled.

[0041] More importantly, the limiter limits the relative position of the sleeve 4 and the bolt 3 when the threaded rod 31 is separated from the threaded hole 21 of the second flange 2. This setting structure not only effectively limits the bolt 3 from falling off the flange, and provides a reliable anti-falling solution; it also fixes the position of the bolt 3 itself by limiting the relative position, which greatly reduces the difficulty of alignment before subsequent installation and screwing, and even if a remote operating mechanism is used, the screwing action can be completed conveniently and quickly; at the same time, this setting structure provides a basis for whether the disassembly is completed. Whether the sleeve 4 and the bolt 3 have completed the limit can be reversely inferred whether the threaded rod 31 is separated from the second flange 2. Even if a remote operating mechanism is used, an accurate judgment can be made on whether the disassembly is in place, thereby improving work efficiency.

[0042] Accordingly, the device of this embodiment can completely use a remote operating mechanism to complete disassembly and installation, and the overall structure is a pure mechanical structure, which is less affected by the radioactive environment and can be applied to the field of equipment technology in radioactive environments. Specifically, it can be used for situations where some components of equipment or pipelines need to be replaced or disassembled remotely in a radioactive environment. In order to solve the problem of bolts falling off on equipment or pipelines, a bolt flange device that can be used for remote replacement is provided. The first flange 1 and the second flange 2 can be respectively arranged on two parts of the equipment to be disassembled, installed or replaced (such as the cylinder and the head).

[0043] In this embodiment, the through hole is a stepped hole that passes through the sleeve 4. The sleeve 4 is connected to the first flange 1 with the end face of the large diameter section 41 of the stepped hole. The limiter between the bolt 3 and the sleeve 4 includes an internal thread arranged on the small diameter section 42 of the stepped hole, and the internal thread is adapted to the external thread of the threaded rod 31 of the bolt 3.

[0044] In this setting structure, directly screwing the bolt 3 can limit the position of the bolt 3 through the thread on the small diameter section 42, and can directly limit the bolt 3 to a position coaxial with the threaded hole 21 of the second flange 2, thereby further reducing the difficulty of alignment. When the components are replaced, when they are installed again, the bolt 3 can be directly screwed to make it fit and connect with the threaded hole 21 again. In addition, it is possible to accurately calculate and determine whether the bolt 3 is completely out of the threaded hole 21 by the number of threads of the bolt 3 passing through the small diameter section 42 (of course, this embodiment mainly uses the method of limiting the subsequent retaining ring 5 to change the torque of screwing, and the above method can also be used in other embodiments).

[0045] In this embodiment, Figure 1 As shown, the length L1 of the threaded rod 31 of the bolt 3 is greater than the sum of the length N1 of the light hole 11 and the length N3 of the large diameter section 41, so that the threaded rod 31 is threadedly connected with the small diameter section 42 when it is completely disengaged from the threaded hole 21, thereby ensuring that the threaded rod 31 is limited by the sleeve 4 when it is completely disengaged from the threaded hole 21.

[0046] In this embodiment, the bolt 3 is provided with an optical axis section 33, which is located between the threaded rod 31 and the nut 32 of the bolt 3. The diameter of the optical axis section 33 is smaller than the thread minor diameter of the threaded rod 31, and the length L2 is greater than the length N4 of the small diameter section 42, so as to avoid interference with the nut 32 pressing against the end face of the sleeve 4. That is, from the radial direction, since the diameter of the optical axis section 33 is smaller than the thread minor diameter, there is no interference with the internal thread of the small diameter section 42; from the axial direction, since the length of the optical axis section 33 is greater than the small diameter section 42, when the nut 32 is in contact with the end face of the sleeve 4, the threaded rod 31 has already been separated from the small diameter section 42 and only cooperates with the threaded hole 21, and there is no thread interference, so the nut 32 can completely press against the end face of the sleeve 4 by screwing the bolt 3.

[0047] In this embodiment, the stopper between the bolt 3 and the sleeve 4 also includes a retaining ring 5, which is detachably sleeved and connected to the outside of the threaded rod 31 of the bolt 3, and the diameter of the retaining ring 5 is larger than the diameter of the small diameter section 42 of the stepped hole, and smaller than the diameter of the large diameter section 41 and the diameter of the light hole 11. Through this structural setting, the retaining ring 5 can achieve the limiting function by fitting the step surface of the stepped hole of the sleeve 4, and when the retaining ring 5 fits the step surface during the disassembly process, continuing to screw the bolt 3 will not cause it to continue to extend out of the sleeve 4, but will increase the torque. In this way, it is possible to accurately determine whether the bolt 3 has reached the limit position, that is, it is possible to accurately determine whether it has been disassembled in place, so that it is more convenient to use a remote operating mechanism for operation.

[0048] In this embodiment, Figure 3As shown, the spacing L3 between the installation position of the retaining ring 5 and the nut 32 of the bolt 3 is greater than the length N5 of the sleeve 4 to avoid interference with the installation of the retaining ring 5, that is, before the sleeve 4 is connected to the first flange 1, the bolt 3 can be connected to the sleeve 4 until the nut 32 contacts the end face of the sleeve 4, and then the retaining ring 5 is installed on the threaded rod 31, and then the bolt 3 is screwed out of the sleeve 4 until the retaining ring 5 contacts the step surface of the stepped hole of the sleeve 4, and then the sleeve 4 and the first flange 1 are connected. And the spacing L3 is less than the sum of the length N5 of the sleeve 4 and the length N1 of the light hole 11, so that the retaining ring 5 is located in the light hole 11 when the nut 32 is pressed against the end face of the sleeve 4, avoiding the interference of the large diameter retaining ring 5 with the threaded hole 21, which makes it difficult for the nut 32 to press against the sleeve 4.

[0049] In this embodiment, the distance L4 between the installation position of the retaining ring 5 and the end of the threaded rod 31 is less than the sum of the length N1 of the light hole 11 and the length N3 of the large diameter section 41, so that the retaining ring 5 can be pressed against the step surface of the stepped hole when the threaded rod 31 is completely separated from the threaded hole 21. And this distance L4 should be greater than the length N2 of the threaded hole 21, so as to ensure that the matching length of the threaded rod 31 and the threaded hole 21 is not less than the length of the threaded hole 21.

[0050] In this embodiment, the retaining ring 5 is sleeved outside the threaded rod 31, and is detachably connected to the threaded rod 31 through a fastener 51 that radially penetrates the retaining ring 5 and penetrates the threaded rod 31. The fastener 51 can be a screw.

[0051] In this embodiment, the device further includes a gasket 6, which is arranged between the first flange 1 and the second flange 2 to seal the gap therebetween and achieve a sealed connection (in this embodiment, the length N2 of the threaded hole 21 also includes the thickness of the gasket 6).

[0052] The device of this embodiment generally includes a bolt 3, a sleeve 4, a retaining ring 5, a screw fastener 51, an upper flange (first flange 1), a lower flange (second flange 2) and a gasket 6. Among them, the nut 32 structure of the bolt 3 is designed to match the electric wrench and other equipment carried by the remote operating mechanism. The screw rod is an upper cylindrical part (light axis section 33) and a lower external thread (threaded rod 31). In addition, the screw rod contains a retaining ring 5, which is fixed by a screw; the upper part of the sleeve 4 contains an internal thread, which matches the external thread size of the screw rod of the bolt 3; the upper flange contains an inner hole (light hole 11), the inner diameter of which is larger than the outer diameter of the retaining ring 5; the lower flange contains an internal thread hole 21, which matches the external thread size of the screw rod of the bolt 3.

[0053] After the upper flange, lower flange and gasket 6 are installed, first pass the bolt 3 through the sleeve 4, fix the retaining ring 5 on the screw rod with screws, screw the bolt 3 to move the retaining ring 5 upward to the upper wall of the sleeve 4, and then weld the sleeve 4 to the upper flange to complete the installation of the device.

[0054] Among them, the design length of the external thread of the screw in the bolt 3 is that when the bolt 3 is completely separated from the lower flange, the screw should have been threadedly connected with the internal thread in the sleeve 4; the diameter of the cylinder of the screw in the bolt 3 is smaller than the inner diameter of the internal thread of the sleeve 4; the lower end of the bolt 3 is chamfered to facilitate the remote positioning and installation of equipment or components, and correspondingly, a countersunk hole can be set at the end face of the small diameter section of the stepped hole of the sleeve 4 to facilitate the insertion of the bolt 3. The position of the retaining ring 5 on the bolt 3 is that when the bolt 3 is completely separated from the lower flange, the retaining ring 5 moves upward to the upper wall of the sleeve 4; and when the bolt 3 is sealed, the retaining ring 5 is located in the inner hole of the upper flange. The nut 32 of the bolt 3 is matched with the electric wrench carried by the power hand or the manipulator. The sleeve 4 and the upper flange can be fixed by welding or threaded connection to lock the bolt 3 in the structure and prevent it from falling off.

[0055] It can be seen that the device also includes the following advantages:

[0056] (1) Pure mechanical structure, simple and reliable;

[0057] (2) Remote operation can be accomplished through power hands and electric wrenches in radioactive environments;

[0058] (3) When equipment or components are replaced over long distances, the bolts can be locked in the structure and will not fall off.

[0059] Example 2

[0060] The installation method of the anti-drop bolt flange device of this embodiment is used to install the anti-drop bolt flange device in Example 1. The device can be first welded and installed with the equipment that needs to be replaced remotely, and then the bolts are tightened to achieve the sealing of the equipment, and then the equipment is transported to a radioactive environment for use; the method includes the following steps:

[0061] The first flange 1 and the second flange 2 are butt-jointed; specifically, a gasket 6 is sandwiched between the first flange 1 and the second flange 2, and the holes on the gasket 6, the first flange 1 and the second flange 2 are ensured to be coaxial;

[0062] The sleeve 4 is sleeved on the outside of the bolt 3 and limited by the limiter; specifically, the bolt 3 is screwed through the sleeve 4 in the forward direction (from the small diameter section 42 to the large diameter section 41) until the installation position of the retaining ring 5 extends out from the other end of the sleeve 4, the retaining ring 5 is fixed to the threaded rod 31 by screws, and the bolt 3 is screwed in the reverse direction to move the retaining ring 5 upward to the upper wall (step surface) of the sleeve 4;

[0063] Connect the sleeve 4 with the bolts 3 to the first flange 1, which can be connected by welding or other methods;

[0064] The bolt 3 is screwed forward to make it fit and connect with the second flange 2, and the screwing is continued until the torque reaches the set value. When the nut 32 is fitted with the end face of the sleeve 4, the torque is increased by continuing to screw the bolt 3 forward. When the torque reaches the set value, the nut 32 is tightly pressed against the sleeve 4, thereby ensuring the sealing. The above-mentioned forward and reverse directions are relative, and the set value can be selected according to the sealing requirements, etc.

[0065] Example 3

[0066] The demister device of this embodiment includes a head 7, a cylinder 8, a filter element and the anti-detachment bolt flange device in Example 1, the filter element is located in the inner cavity of the cylinder 8, the head 7 is used to close the inner cavity opening of the cylinder 8, the first flange 1 and the second flange 2 in the anti-detachment bolt flange device are respectively arranged at the edges where the head 7 and the cylinder 8 are butted against each other, and the head 7 and the cylinder 8 are connected by bolts 3 and sleeves 4. The sealing gasket 6 seals the head 7 and the cylinder 8. The device can be used to capture impurities such as droplets and aerosols contained in radioactive gases. When the pressure drop of the device is large, the filter element needs to be replaced, and the anti-detachment bolt flange device can be operated to replace it.

[0067] Example 4

[0068] The method for replacing a device component of this embodiment is used to replace a device component. The device is connected using the anti-drop bolt flange device in Embodiment 1. The method comprises the following steps:

[0069] Through remote operation, the bolt 3 of the equipment is separated from the second flange 2, and the sleeve 4 and the bolt 3 are limited by the limiting member;

[0070] Lift the equipment setting part away through remote operation;

[0071] After completing the replacement of equipment components through remote operation, reset the equipment settings;

[0072] The bolt 3 is screwed by remote operation to make it fit and connect with the second flange 2, and the screwing is continued until the torque reaches the set value.

[0073] like Figure 2 and Figure 3 As shown, in combination with the specific structure in Example 1, the upper flange is welded or connected to the equipment head 7 (remote disassembly assembly component) to form a whole, the lower flange is welded or connected to the equipment barrel 8 (fixed part) to form a whole, the bolts 3 are screwed to achieve the sealing of the equipment, and the equipment is transported to a radioactive environment for use. When the head 7 or internal components need to be replaced, the specific replacement steps are as follows:

[0074] By operating the power hand in the factory to carry an electric wrench, screw the bolt 3 in the reverse direction to completely detach the screw from the lower flange until the retaining ring 5 moves upward to the upper wall (step surface) of the sleeve 4, and the torque of the electric wrench increases to the set value, indicating that the retaining ring 5 and the sleeve 4 are completely in close contact, that is, the screw is detached from the lower flange, and the lower flange and the upper flange are loosened;

[0075] Lift off the upper part of the equipment (i.e., the head 7 or the part with the upper flange, sleeve 4 and bolt 3), and after completing the replacement of the internal components, reset the upper part of the equipment. When lifting the upper part of the equipment, the bolt 3 is threadedly connected with the sleeve 4 to achieve the anti-slip function;

[0076] By operating the power hand in the factory to carry an electric wrench, screw the bolt 3 in the forward direction, insert the screw into the lower flange, until the nut 32 of the bolt 3 drops onto the sleeve 4, continue to screw the bolt 3 in the forward direction, and the torque of the electric wrench increases rapidly until the set value is reached, and the sealing of the upper flange and the lower flange is completed. The above-mentioned forward and reverse directions are relative, and the set value can be selected according to the sealing requirements, etc.

[0077] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. An anti-drop bolt flange device, characterized in that: It comprises a first flange (1), a second flange (2), bolts (3) and a sleeve (4), The sleeve (4) is connected to a surface of the first flange (1) away from the second flange (2). The sleeve (4), the first flange (1) and the second flange (2) are respectively provided with a coaxial through hole, a light hole (11) and a threaded hole (21). The bolt (3) is inserted into the sleeve (4) and the first flange (1) in sequence and is adapted to be connected with the second flange (2) through a threaded pair, so as to fix the first flange (1) and the second flange (2). The bolt (3) and the sleeve (4) are limited by a limiting member, which is used to limit the relative position of the sleeve (4) and the bolt (3) when the bolt (3) is separated from the threaded hole (21) of the second flange (2).

2. The anti-drop bolt flange device according to claim 1, characterized in that: The through hole is a stepped hole that penetrates the sleeve (4), and the sleeve (4) is connected to the first flange (1) at the end surface of the large diameter section (41) of the stepped hole. The stopper between the bolt (3) and the sleeve (4) comprises an internal thread arranged on a small diameter section (42) of the stepped hole, and the internal thread is adapted to the external thread of the threaded rod (31) of the bolt (3).

3. The anti-drop bolt flange device according to claim 2, characterized in that: The length of the threaded rod (31) of the bolt (3) is greater than the sum of the length of the light hole (11) and the length of the large diameter section (41), so that the threaded rod (31) is threadedly connected with the small diameter section (42) when it is completely separated from the threaded hole (21).

4. The anti-drop bolt flange device according to claim 2, characterized in that: The bolt (3) is provided with an optical axis section (33), and the optical axis section (33) is located between the threaded rod (31) and the nut (32) of the bolt (3). The diameter of the optical axis section (33) is smaller than the minor diameter of the thread of the threaded rod (31), and the length is greater than the length of the small diameter section (42) so as to avoid interference with the end surface of the nut (32) pressing against the sleeve (4).

5. The anti-drop bolt flange device according to claim 1, characterized in that: The through hole is a stepped hole that penetrates the sleeve (4), and the sleeve (4) is connected to the first flange (1) at the end surface of the large diameter section (41) of the stepped hole. The stopper between the bolt (3) and the sleeve (4) comprises a stop ring (5), and the stop ring (5) is detachably sleeved and connected to the outside of the threaded rod (31) of the bolt (3). The diameter of the retaining ring (5) is larger than the diameter of the small diameter section (42) of the stepped hole, and smaller than the diameter of the large diameter section (41) and the diameter of the light hole (11).

6. The anti-drop bolt flange device according to claim 5, characterized in that: The distance between the mounting position of the retaining ring (5) and the nut (32) of the bolt (3) is greater than the length of the sleeve (4) to avoid interference with the mounting of the retaining ring (5). The length of the sleeve (4) is smaller than the sum of the lengths of the sleeve (4) and the light hole (11), so that when the nut (32) is pressed against the end surface of the sleeve (4), the retaining ring (5) is located in the light hole (11).

7. The anti-drop bolt flange device according to claim 5, characterized in that: The distance between the mounting position of the retaining ring (5) and the end of the threaded rod (31) is smaller than the sum of the length of the light hole (11) and the length of the large diameter section (41), so that when the threaded rod (31) is completely separated from the threaded hole (21), the retaining ring (5) can be pressed against the step surface of the stepped hole.

8. The anti-drop bolt flange device according to claim 5, characterized in that: The retaining ring (5) is sleeved on the outside of the threaded rod (31) and is detachably connected to the threaded rod (31) via a fastener (51) that radially penetrates the retaining ring (5) and penetrates into the threaded rod (31).

9. The anti-drop bolt flange device according to claim 1, characterized in that: It also includes a gasket (6), which is arranged between the first flange (1) and the second flange (2).

10. A method for installing an anti-drop bolt flange device, characterized in that: The method for installing the anti-drop bolt flange device according to any one of claims 1 to 9 comprises the following steps: butting the first flange (1) and the second flange (2); The sleeve (4) is sleeved onto the outside of the bolt (3) and is limited in position by a limiting member; Connecting a sleeve (4) with bolts (3) to the first flange (1); The bolt (3) is screwed on so that the bolt (3) is fitted and connected with the second flange (2), and the screwing is continued until the torque reaches a set value.

11. A demister device, characterized in that: It comprises a head (7), a cylinder (8), a filter element and an anti-drop bolt flange device as claimed in any one of claims 1 to 9, The filter core is located in the inner cavity of the cylinder (8). The sealing head (7) is used to seal the inner cavity opening of the cylinder (8). The first flange (1) and the second flange (2) in the anti-drop bolt flange device are respectively arranged at the edges where the head (7) and the cylinder (8) are butted against each other, and the connection between the head (7) and the cylinder (8) is achieved by bolts (3) and sleeves (4).

12. A method for replacing a device component, characterized in that: For replacing equipment components, the equipment is connected by the anti-drop bolt flange device according to any one of claims 1 to 9, and the method comprises the following steps: The bolt (3) of the equipment is separated from the second flange (2) through remote operation, and the sleeve (4) and the bolt (3) are limited by the limiting member; Lift the equipment setting part away through remote operation; After completing the replacement of equipment components through remote operation, reset the equipment settings; The bolt (3) is screwed in by remote operation so that the bolt (3) is matched and connected with the second flange (2), and the screwing is continued until the torque reaches a set value.

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