A bellows sealed reciprocating mechanism for a work tank

Abstract

The present application relates to nuclear system related equipment technical field, specifically to a kind of bellows sealed reciprocating mechanism for working tank, comprising: power drive component, for providing linear reciprocating motion power for the equipment in working tank, set in the outside of fixed plate;Power connecting rod, installed at the output shaft of the power drive component;Sealing assembly, including KF vacuum bellows installed in the outside of the fixed plate and sealed in the power connecting rod, and sealing bushing unit sealedly installed in the inside of the fixed plate;The reciprocating mechanism can provide linear reciprocating power for the equipment in the working tank that does not allow to exist grease, dust-containing environment, solve the automation problem of equipment in working tank, can reduce the labor intensity of operator, and set power structure external layout, it is convenient to overhaul and maintenance;KF vacuum bellows cooperates with sealing bushing unit to realize the isolation between inside and outside of working tank, effectively block dust and corrosive medium, guarantee the airtightness of working tank.

Description

Technical Field

[0001] This invention relates to the field of nuclear system-related equipment technology, specifically to a bellows-sealed reciprocating motion mechanism for a work box. Background Technology

[0002] Nuclear reactors are core vertical container equipment in nuclear chemical and nuclear material process systems. They are usually built into a sealed working chamber, with the door located at the bottom of the container and inside the working chamber. They are suitable for harsh process conditions such as high temperature, fluoride dust, and oil and grease. The working chamber must always maintain a sealed atmosphere to ensure reaction stability and operational safety.

[0003] The opening and closing of the bottom cover of nuclear reactors currently relies mostly on manual operation, which is not only inefficient but also poses safety risks. The reaction of materials inside the reaction vessel in the working chamber is often accompanied by high heat, producing a large amount of fluoride gas carrying powder, which can easily invade the transmission gap, damage the sealing structure, and affect the transmission accuracy. At the same time, the reactants are prone to chemical reactions with grease, and the use of grease-lubricated parts inside the working chamber is strictly prohibited.

[0004] Existing reciprocating motion mechanisms generally use grease-lubricated bearings, conventional packing seals, or rubber seals, which cannot adapt to the oil-free, high-dust, and highly corrosive nuclear working environment. They suffer from defects such as poor sealing reliability, easy jamming of transmission components, and short lifespan, making it difficult to meet the requirements of automated and stable operation of equipment in the work box. Therefore, in order to adapt to the special environment of oil-free and dusty conditions, obtaining a linear reciprocating motion mechanism with reliable sealing has become an urgent need for the automation transformation of nuclear system work boxes. In view of this, we propose a bellows-sealed reciprocating motion mechanism for work boxes. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings mentioned in the background art and provide a bellows-sealed reciprocating motion mechanism for a working box.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A bellows-sealed reciprocating motion mechanism for a work box, comprising: A power drive assembly, used to provide power for the linear reciprocating motion of the equipment inside the work box, is installed outside the fixed plate, which is used to isolate the internal and external environments of the top of the work box. A power linkage is installed at the output shaft of the power drive assembly and is used to insert into the work box to connect the equipment inside the box; The sealing assembly includes a KF vacuum bellows mounted on the outside of the fixed plate and sealed onto the power link, and a sealing bushing unit mounted on the inside of the fixed plate for sealing the insertion of the power link.

[0007] Preferably, the power drive assembly includes a power source mounted on a flange, which is mounted on the outside of the fixed plate via support ribs.

[0008] Preferably, the power source output shaft passes through the flange and is detachably connected to the power connecting rod on the same axis; The power connecting rod is inserted through the fixed plate into the working box.

[0009] Preferably, the two ends of the KF vacuum bellows are respectively sealed and installed on the sealing ring bracket by clamps and O-rings; The upper sealing ring bracket is sealed and installed at the top of the power connecting rod, and the lower sealing ring bracket is sealed and installed on the outside of the fixing plate.

[0010] Preferably, the top end of the power link is provided with a clamping quick-release connector structure; The clamping quick-release connector structure includes a threaded shaft hole that is threadedly connected to the power source output shaft, and a flange provided at the outer edge for press-fitting the sealing ring bracket for sealing connection.

[0011] Preferably, the sealing bushing unit includes a bushing fixing seat that is detachably installed inside the fixing plate, an oil-free bushing is provided between the bushing fixing seat and the power connecting rod, and an oil seal is installed on the end of the oil-free bushing away from the fixing plate.

[0012] Preferably, the oil-free bushing is made of copper sleeve inlaid with graphite or polytetrafluoroethylene material.

[0013] Preferably, a sintered filter is installed on the bushing fixing seat to connect the inner cavity of the KF vacuum bellows with the working box. The sintered filter is used to maintain the pressure balance between the gas inside the tube and the working box when the KF vacuum bellows expands or contracts.

[0014] Preferably, the power source is any one of a pneumatic cylinder, an electric cylinder, an electric push rod, or a hydraulic cylinder.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. The bellows-sealed reciprocating motion mechanism for the work box can provide linear reciprocating power for the equipment inside the work box in environments where grease and dust are not allowed, solve the automation problem of the equipment inside the work box, reduce the labor intensity of operators, and set the power structure externally for easy inspection and maintenance. 2. The KF vacuum bellows, in conjunction with the sealing bushing unit, can isolate the inside and outside of the working chamber, effectively blocking dust and corrosive media, and ensuring the airtightness of the working chamber. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram showing the installation relationship between the power connecting rod and the sealing bushing unit of the present invention.

[0017] The meanings of the labels in the diagram are as follows: 1. Power linkage; 2. Working box sealing ring; 3. Fixing plate; 4. Lifting eye screw; 5. Support rib; 6. KF vacuum bellows; 7. Flange; 8. Power drive assembly; 9. Clamp; 10. O-ring seal; 11. Sealing ring bracket; 12. Sintered filter; 13. Oil seal; 14. Oil-free bushing; 15. Bushing fixing seat. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. 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.

[0019] Please see Figures 1-2 The present invention will describe the above technical solution in detail through the following embodiments: The bellows-sealed reciprocating motion mechanism for working boxes proposed in this embodiment is suitable for use in sealed working boxes for nuclear chemical and nuclear material processes in the nuclear system field. It can be precisely adapted to the harsh working conditions of the working box, which is sensitive to grease, contains fluoride dust, and has limited space. It provides stable linear reciprocating power for the operation of opening and closing the reactor cover door in the working box. Through the integrated design of external power unit, bellows sealing, and oil-free guidance, it solves the problems of high labor intensity and high radiation risk of traditional manual operation, as well as the problems of easy seal failure and reliance on grease lubrication leading to process side reactions in conventional reciprocating motion mechanisms. It realizes the automation of equipment operation in the working box, the long-term sealing and the stability of operation.

[0020] The overall structure of the device is as follows: Figure 1As shown, the core consists of a fixed plate 3 for isolating the internal and external environments of the top of the work box, a power drive assembly 8 set outside the fixed plate 3, a power linkage 1 that is connected to the power drive assembly 8, and a sealing assembly fitted on the power linkage 1. The fixed plate 3 is also equipped with eye bolts 4 to facilitate the transportation, installation and maintenance of the entire mechanism. A work box sealing ring 2 is installed at the joint between the fixed plate 3 and the top plate of the work box to ensure the basic airtightness of the top of the work box.

[0021] The fixing plate 3 is a rigid flat plate structure, horizontally fixed at the top opening of the work box, serving as a physical partition between the internal and external environments of the work box. A through hole is opened in the center of its plate surface for the insertion of the power connecting rod 1. The inner side of the through hole is sealed with the sealing bushing unit, and the outer side is sealed to the bottom end of the KF vacuum bellows 6, achieving full sealing isolation of the insertion position of the power connecting rod 1, preventing the leakage of fluoride dust inside the work box, and preventing the external environment from interfering with the process atmosphere inside the work box. The upper surface of the fixing plate 3 is also fixedly connected to the flange 7 through the support ribs 5. The support ribs 5 are evenly distributed around the flange 7, providing stable support for the power drive assembly 8. In this embodiment, the support ribs 5 and the fixing plate 3 are fixedly connected by welding. The flange 7 has corresponding through holes, and the support ribs 5 have corresponding threaded holes. The bolts are screwed into the threaded holes through the through holes to achieve fixed installation, so as to adjust the level by adding or removing shims and keep the output shaft and the power connecting rod 1 perpendicular to each other.

[0022] Specifically, the power drive assembly 8, as the power source of the entire mechanism, is located outside the fixed plate 3 to avoid the influence of the special environment inside the working box, and at the same time facilitates later inspection and maintenance. The power drive assembly 8 includes a flange 7 and a power source mounted on the flange 7. In this embodiment, a cylinder is selected as the power source. In actual applications, it can be replaced with other linear drive components such as electric cylinders, electric push rods, and hydraulic cylinders according to the process requirements of the working box. The output shaft of the power source is set vertically downward and is detachably connected to the top of the power connecting rod 1 coaxially after passing through the flange 7. In this embodiment, a threaded connection is adopted, which is stable and easy to disassemble and assemble, ensuring the efficiency and stability of power transmission.

[0023] The power connecting rod 1 is a rigid cylindrical structure, with a top end provided with... Figure 2 The clamping quick-release connector structure shown includes a threaded shaft hole that mates with the output shaft of the power source, and a flange located on the outer edge of the power connecting rod 1. The flange is used to press and seal with the upper sealing ring bracket 11 to achieve a sealed connection between the power connecting rod 1 and the sealing ring bracket 11. The lower end of the power connecting rod 1 is inserted from top to bottom through the through hole of the fixing plate 3 and then extends into the working box to be fixedly connected with the equipment inside the box. In this embodiment, it is used to connect the movement of the internal robotic arm, and the automatic opening and closing of the nuclear reactor cover door is achieved by driving the robotic arm to move back and forth.

[0024] In this embodiment, the sealing assembly is the core component for achieving sealing and isolation between the inside and outside of the working chamber. It includes a KF vacuum bellows 6 and a sealing bushing unit. The KF vacuum bellows 6 is sealed to the outside of the power connecting rod 1 and located above the fixing plate 3. Its two ends are respectively sealed and mounted on the sealing ring bracket 11 via clamps 9 and O-rings 10. The upper sealing ring bracket 11 is press-fitted to the flange at the top of the power connecting rod 1 for sealing, while the lower sealing ring bracket 11 is sealed and fixed to the upper surface of the fixing plate 3. The O-ring 10 is embedded in the KF vacuum bellows... The connection end face between the KF vacuum bellows 6 and the sealing ring bracket 11 ensures the sealing effect of the connection. The clamp 9 is a quick-release structure, which can realize the quick locking and disassembly of the KF vacuum bellows 6, which is convenient for the replacement and maintenance of the bellows later. The KF vacuum bellows 6 can expand and contract with the linear reciprocating motion of the power connecting rod 1, which not only provides sufficient space for the displacement of the power connecting rod 1, but also realizes complete sealing and isolation between the working box and the outside world, replacing the traditional packing seal or rubber seal, and fundamentally solving the problems of easy wear and leakage of the sealing structure.

[0025] The sealing bushing unit is installed inside the fixed plate 3 and is sealed to the insertion through hole of the power connecting rod 1, and its structure is as follows: Figure 2 As shown, the device includes a bushing fixing seat 15, an oil-free bushing 14, and an oil seal 13. The bushing fixing seat 15 is a hollow structure and can be detachably installed on the inner side of the fixing plate 3 by bolts. Its central through hole is coaxially arranged with the insertion through hole of the fixing plate 3. The power connecting rod 1 is sealed and inserted into the central through hole of the bushing fixing seat 15. An oil-free bushing 14 is press-fitted at the contact surface between the inner wall of the through hole of the bushing fixing seat 15 and the power connecting rod 1. The oil-free bushing 14 is made of copper sleeve inlaid with graphite or polytetrafluoroethylene, which has self-lubricating properties and does not require grease lubrication, thus providing linear reciprocating motion for the power connecting rod 1. It provides stable support and guidance and effectively reduces friction loss, meeting the stringent working conditions of the working chamber where grease is not allowed. It fundamentally eliminates the process side reactions caused by the contact between grease and fluorine-containing materials in the chamber. An oil seal 13 is installed at the end of the oilless bushing 14 away from the fixed plate 3. The oil seal 13 fits tightly against the outer wall of the power connecting rod 1, which can effectively prevent fluoride dust in the working chamber from entering the bushing fixing seat 15 and the KF vacuum bellows 6. This avoids dust intrusion into the transmission clearance, which could cause the power connecting rod 1 to jam and the oilless bushing 14 to wear, thus ensuring the operational stability and service life of the entire mechanism.

[0026] A sintered filter 12 is also installed on the bushing fixing seat 15. One end of the sintered filter 12 is connected to the inside of the working box, and the other end is connected to the internal space of the KF vacuum bellows 6. When the KF vacuum bellows 6 reciprocates with the linear motion of the power connecting rod 1, the volume of gas inside it will change, which can easily generate a pressure difference that causes the bellows to deform and break or become stuck. The sintered filter 12 can realize the gas exchange between the inside of the KF vacuum bellows 6 and the inside of the working box, balance the pressure between the two in real time, and ensure the normal expansion and contraction of the KF vacuum bellows 6 and the smooth operation of the entire mechanism. At the same time, the porous sintered structure of the sintered filter 12 can also filter the dust in the working box to prevent dust from entering the inside of the KF vacuum bellows 6. The sintered filter 12 is assembled with the bushing fixing seat 15 by a threaded connection, which is convenient for disassembly and assembly, and easy for later cleaning and replacement.

[0027] The overall working process of the bellows-sealed reciprocating motion mechanism for the working box of the present invention is as follows: When it is necessary to drive the equipment inside the working box to perform linear reciprocating motion, the power source of the power drive assembly 8 is started. The output shaft of the power source performs linear reciprocating extension and retraction motion, driving the power connecting rod 1 connected thereto to perform linear reciprocating motion synchronously. The power connecting rod 1 transmits power to the equipment inside the working box, realizing the automated operation of the equipment, such as the automated opening and closing of the nuclear reactor cover door; during the movement of the power connecting rod 1, the KF vacuum bellows 6 moves synchronously with the displacement of the power connecting rod 1. The telescopic deformation maintains a sealed enclosure of the power connecting rod 1, achieving sealed isolation between the inside and outside of the working chamber. The sintering filter 12 balances the pressure inside the KF vacuum bellows 6 and inside the working chamber in real time, preventing the bellows from deforming and breaking due to excessive pressure difference, while also preventing the power connecting rod 1 from jamming. The oil-free bushing 14 provides oil-free guidance and support for the movement of the power connecting rod 1, reducing friction loss. The oil seal 13 effectively prevents fluoride dust from entering the working chamber, protecting the transmission cooperation between the oil-free bushing 14 and the power connecting rod 1, and ensuring the operational stability of the entire mechanism.

[0028] The entire mechanism is fully automated, eliminating the need for manual entry into the work chamber or manual operation of the equipment. This effectively solves the problems of difficult angles and heavy loads associated with traditional manual operation, significantly reducing the labor intensity of operators and minimizing their contact with the nuclear radiation environment, thus improving radiation safety protection levels. For later maintenance and repair, the mechanism adopts a modular, quick-release design, ensuring convenient operation and high maintenance efficiency. The power drive component 8 is externally located outside the work chamber, allowing operators to directly perform maintenance and repairs without contacting the special environment inside the work chamber. The KF vacuum bellows 6 can be quickly installed and removed using clamps 9, enabling rapid replacement. The oil-free bushing 14 and oil seal 13 can be quickly replaced by removing the bushing fixing seat 15, and the oil-free design eliminates the need for periodic lubrication, significantly reducing daily maintenance costs. The sintering filter 12 has a threaded connection structure, allowing for easy disassembly by twisting. Internal dust can be cleaned using a backflushing method to prevent blockages that could affect the pressure balance.

[0029] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0030] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, "multiple" refers to two or more. Moreover, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0031] 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 the spirit or essential characteristics of the invention. 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, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A bellows-sealed reciprocating motion mechanism for a work box, characterized in that: include: The power drive assembly (8) is used to provide power for the linear reciprocating motion of the equipment inside the work box. It is set outside the fixed plate (3), which is used to isolate the internal and external environment of the top of the work box. The power linkage (1) is installed at the output shaft of the power drive assembly (8) and is used to insert into the work box to connect the equipment inside the box; The sealing assembly includes a KF vacuum bellows (6) mounted on the outside of the fixed plate (3) and sealed on the power link (1), and a sealing bushing unit mounted on the inside of the fixed plate (3) for sealing the insertion of the power link (1).

2. The bellows-sealed reciprocating motion mechanism for a working box as described in claim 1, characterized in that: The power drive assembly (8) includes a power source mounted on a flange (7), which is mounted outside the fixed plate (3) via a support rib (5).

3. The bellows-sealed reciprocating motion mechanism for a working box as described in claim 2, characterized in that: The power source output shaft passes through the flange (7) and is coaxially and detachably connected to the power connecting rod (1); The power linkage (1) is inserted through the fixed plate (3) into the working box.

4. The bellows-sealed reciprocating motion mechanism for a working box as described in claim 2, characterized in that: The two ends of the KF vacuum bellows (6) are respectively sealed and installed on the sealing ring bracket (11) by clamps (9) and O-rings (10); The upper sealing ring bracket (11) is sealed and installed at the top of the power connecting rod (1), and the lower sealing ring bracket (11) is sealed and installed outside the fixed plate (3).

5. The bellows-sealed reciprocating motion mechanism for a working box as described in claim 4, characterized in that: The top of the power link (1) is provided with a clamping quick-release connector structure; The clamping quick-release connector structure includes a threaded shaft hole that is threaded to the output shaft of the power source, and a flange provided at the outer edge for press-fitting the sealing ring bracket (11) for sealing connection.

6. The bellows-sealed reciprocating motion mechanism for a working box as described in claim 1, characterized in that: The sealing bushing unit includes a bushing fixing seat (15) that is detachably installed inside the fixing plate (3). An oil-free bushing (14) is provided between the bushing fixing seat (15) and the power connecting rod (1), and an oil seal (13) is installed on the end of the oil-free bushing (14) away from the fixing plate (3).

7. The bellows-sealed reciprocating motion mechanism for a working box as described in claim 6, characterized in that: The oil-free bushing (14) is made of copper sleeve inlaid with graphite or polytetrafluoroethylene material.

8. The bellows-sealed reciprocating motion mechanism for a working box as described in claim 6, characterized in that: A sintered filter (12) is installed on the bushing fixing seat (15) to connect the inner cavity of the KF vacuum bellows (6) with the working box. The sintered filter (12) is used to maintain the pressure balance between the gas inside the tube and the working box when the KF vacuum bellows (6) expands and contracts.

9. The bellows-sealed reciprocating motion mechanism for a working box as described in claim 2, characterized in that: The power source is any one of a pneumatic cylinder, an electric cylinder, an electric push rod, or a hydraulic cylinder.

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