Sealing and taking device for pebble-bed reactor tank cover and using method of sealing and taking device

Abstract

The invention discloses a pebble-bed reactor tank cover sealing and taking device and a using method, and belongs to the technical field of high-temperature gas cooled reactor fuel loading, unloading and storage. Comprising a supporting unit, and the supporting unit comprises a supporting frame, a lifting part arranged on the supporting frame, an electromagnetic lock arranged on the lifting part and a guide pipe arranged on the supporting frame; the sealing and taking unit comprises an air cylinder arranged in the guide pipe, a reversing valve arranged below the air cylinder and a clamping jaw part arranged in the guide pipe. Through the accurate design of the electromagnetic lock and the clamping jaw part, the stability and the safety in the process of sealing and taking the reactor tank cover are ensured, the risk that operators make contact with radioactive substances is reduced, the safety and the efficiency of sealing and taking the pebble-bed reactor tank cover are improved, the maintenance cost is reduced, the environmental adaptability is enhanced, and the service life of the pebble-bed reactor tank cover is prolonged. And powerful technical support is provided for safe operation and maintenance of the nuclear energy industry.

Description

Technical Field

[0001] The invention relates to the technical field of high temperature gas-cooled reactor fuel loading, unloading and storage, and in particular to a pebble bed reactor tank cover sealing device and a use method thereof. Background Art

[0002] The high temperature gas-cooled reactor is an advanced reactor technology with independent intellectual property rights and characteristics of the fourth generation of nuclear energy in my country. The modular high temperature gas-cooled reactor nuclear power plant has inherent safety, simple system, high power generation efficiency, wide application, potential economic competitiveness, and has received wide attention internationally.

[0003] Among them, the fuel loading and unloading and storage system is a key system to achieve long-term safe and stable operation of the pebble bed high temperature gas-cooled reactor. By utilizing the favorable geometric characteristics of spherical fuel elements, the fuel replacement function of the reactor can be realized without stopping the reactor. The high temperature gas-cooled reactor fuel loading and unloading system performs the functions of loading new fuel, unloading spent fuel and recycling fuel elements without stopping the reactor. After the spent fuel is unloaded from the reactor, it is loaded into the spent fuel storage tank for storage through the spent fuel storage system. In order to prevent radioactive substances from escaping from the tank to the environment during the spent fuel storage process, the spent fuel storage tank is equipped with a special tank cover. Therefore, it is necessary to design a special tank cover sealing mechanism to realize the opening and closing operations of the spent fuel tank cover. Summary of the invention

[0004] In view of the problems existing in the above-mentioned existing pebble bed reactor tank cover sealing and removing device and method, the present invention is proposed.

[0005] Therefore, the purpose of the present invention is to provide a pebble bed type reactor tank cover sealing device and method, the purpose of which is to solve the problems of precise positioning, stable grasping and safe operation in the process of sealing the pebble bed type reactor tank cover, and to provide a sealing device with optimized structure and easy operation to improve the efficiency and safety of reactor maintenance.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: comprising:

[0007] A support unit, comprising a support frame, a lifting part arranged on the support frame, an electromagnetic lock arranged on the lifting part, and a guide tube arranged on the support frame;

[0008] The sealing unit comprises a cylinder arranged in the guide tube, a reversing valve arranged below the cylinder, and a claw part arranged in the guide tube.

[0009] As a preferred solution of the pebble bed reactor tank cover sealing device of the present invention, the lifting part includes a driving assembly arranged on the supporting frame, and a self-locking assembly arranged on the driving assembly.

[0010] As a preferred solution of the pebble bed reactor tank cover sealing device of the present invention, the driving assembly includes a lifting plate arranged on the support frame, an electromagnet core arranged on the lifting plate, and a valve stem arranged on the lifting plate and the electromagnet core.

[0011] As a preferred solution of the pebble bed reactor tank cover sealing device of the present invention, the self-locking assembly includes a limit stopper arranged on the valve stem, and a heat dissipation plate arranged on the limit stopper.

[0012] As a preferred solution of the pebble bed reactor tank cover sealing device of the present invention, the clamping claw portion includes a grabbing assembly arranged in the guide tube, and a fastening assembly arranged under the grabbing assembly.

[0013] As a preferred solution of the pebble bed reactor tank cover sealing device of the present invention, the grabbing assembly includes a claw chuck arranged in the guide tube, a rotating block arranged on the claw chuck, and a movable claw arranged under the rotating block.

[0014] As a preferred solution of the pebble bed reactor tank cover sealing device of the present invention, the fastening assembly includes a limit plate arranged on the movable claw, and an anti-skid plate arranged on the limit plate.

[0015] Another object of the present invention is to provide a method for using a pebble bed reactor tank cover sealing device, comprising:

[0016] When grabbing the tank cover, the lifting part is started to move the electromagnetic lock to the top of the reactor tank cover, and the cylinder is started to move the claw part to the predetermined position above the tank cover;

[0017] Operate the reversing valve to raise the cylinder to the upper limit position and maintain it, release the mechanical self-locking of the cylinder, and allow the lifting cylinder to move downward until the grabbing assembly contacts the tank cover;

[0018] Switch the reversing valve to inflate the cylinder, so that the cylinder drives the grabbing assembly to descend into the tank cover;

[0019] Switch the reversing valve to deflate the cylinder. At this time, the movable claw opens to grab the tank cover, and the electromagnetic reversing valve is placed in the positive pressure charging position to make the cylinder rise, driving the movable claw to carry the tank cover to the preset position;

[0020] When putting the tank cover back on, place the electromagnetic reversing valve in the positive pressure charging position, supply high-pressure air to the lower end of the cylinder, so that the cylinder rises to the limit position and maintains it, releases the mechanical self-locking of the cylinder, and allows the lifting cylinder to move downward;

[0021] Place the electromagnetic reversing valve in the reverse pressure charging position, so that the lifting cylinder of the tank cover sealing device drives the claws and the tank cover to descend, perform the tank cover sealing operation, and reset the tank cover to the tank mouth;

[0022] After the tank cover is successfully removed or installed, the claw part and the lifting part are retracted to the initial position.

[0023] As a preferred scheme of the method for using the pebble bed reactor tank cover sealing device of the present invention, wherein: during operation, the tank cover is prevented from falling off or getting loose by the fastening assembly.

[0024] As a preferred scheme for the method of using the pebble bed reactor tank cover sealing device of the present invention, the self-locking component is used to avoid misoperation by the staff during operation.

[0025] Beneficial effects of the present invention: The present invention ensures stability and safety in the process of sealing the reactor tank cover through precise electromagnetic lock and claw part design, reduces the risk of operators contacting radioactive materials, and the automated control system and the cylinder-driven claw part can quickly and accurately locate and seal the tank cover, significantly improving the work efficiency of reactor maintenance and overhaul. The design of the self-locking component and the limit stop block enhances the stability of the device during operation and prevents equipment damage or accidents caused by improper operation. The fastening component of the claw part ensures the sealing of the tank cover, prevents the leakage of radioactive materials, and protects the environment and personnel safety. The present invention not only improves the safety and efficiency of sealing the tank cover of the pebble bed reactor, but also reduces maintenance costs, enhances environmental adaptability, and provides strong technical support for safe operation and maintenance of the nuclear energy industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0027] Figure 1 It is a schematic diagram of the overall structure of the pebble bed reactor tank cover sealing and removing device of the present invention.

[0028] Figure 2 It is a cross-sectional schematic diagram of the sealing and removing device for the tank cover of a pebble bed reactor according to the present invention.

[0029] Figure 3 It is a schematic diagram of the structure of the sealing unit of the pebble bed reactor tank cover sealing device of the present invention.

[0030] Figure 4 It is a schematic diagram of the structure of the lifting part of the pebble bed reactor tank cover sealing device of the present invention.

[0031] Figure 5 for Figure 3 Enlarged schematic diagram at point A in the middle. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0033] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0034] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0035] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0036] Example 1

[0037] Reference Figure 1-3 , which is the first embodiment of the present invention, provides a pebble bed reactor tank cover sealing device, the device comprising:

[0038] The support unit 100 includes a support frame 101, a lifting part 102 arranged on the support frame 101, an electromagnetic lock 103 arranged on the lifting part 102, and a guide tube 104 arranged on the support frame 101. The support frame 101 allows the device to be stably placed near the reactor to ensure the stability and load-bearing capacity of the entire device. The lifting part 102 is installed on the support frame 101 and can vertically move the electromagnetic lock 103 to a required height to facilitate the sealing operation of the reactor tank cover. The electromagnetic lock 103 is installed on the lifting part 102 to facilitate fixing or releasing the tank cover during operation and ensure the stability of the tank cover during the sealing process. The guide tube 104 is fixed on the support frame 101 to provide guidance to prevent the tank cover from deflecting during operation.

[0039] The sealing unit 200 includes a cylinder 201 arranged in the guide tube 104, a reversing valve 202 arranged below the cylinder 201, and a claw portion 203 arranged in the guide tube 104. The cylinder 201 is installed in the guide tube 104 and is driven by pneumatic or hydraulic power to realize the up and down movement of the claw portion 203 so as to grasp or release the tank cover. The reversing valve 202 is used to control the moving direction of the cylinder 201 and control the opening and closing of the claw portion 203. The claw portion 203 is installed in the guide tube 104 and is connected to the cylinder 201. The claw portion 203 can stably grasp the tank cover and can be released smoothly when released to avoid working errors.

[0040] Among them, the lifting part 102 includes a driving component 102a arranged on the support frame 101, and a self-locking component 102b arranged on the driving component 102a. The driving component 102a can provide power and control the vertical movement of the lifting part 102 to achieve the smooth rise and fall of the lifting part 102. The self-locking component 102b enables the lifting part 102 to automatically lock after reaching the desired position to prevent the lifting part 102 from sliding or accidentally moving due to unexpected situations (such as power outages, operational errors, etc.).

[0041] The driving assembly 102a includes a lifting plate 102a-1 arranged on the support frame 101, an electromagnet core 102a-2 arranged on the lifting plate 102a-1, and a valve stem 102a-3 arranged on the lifting plate 102a-1 and the electromagnet core 102a-2. When the electromagnet core 102a-2 is energized, a magnetic force is generated to attract or push the components connected to the valve stem 102a-3, causing the valve stem 102a-3 to move up and down, thereby driving the lifting plate 102a-1 and the entire lifting part 102 to move vertically.

[0042] The self-locking component 102b includes a limit block 102b-1 arranged on the valve stem 102a-3, and a heat sink 102b-2 arranged on the limit block 102b-1. When the lifting part 102 needs to be locked at a specific position, the limit block 102b-1 on the valve stem 102a-3 prevents the valve stem 102a-3 from moving further, thereby achieving self-locking. The heat sink 102b-2 can ensure that the electromagnet core 102a-2 remains stable during continuous operation or frequent operation.

[0043] During use, the staff operates the lifting part 102 to move the electromagnetic lock 103 to the top of the reactor tank cover. The electromagnetic core 102a-2 in the driving assembly 102a is energized to generate magnetic force, driving the valve stem 102a-3 to move up and down. When the lifting part 102 reaches the predetermined position, the limit stopper 102b-1 in the self-locking assembly 102b realizes precise positioning and locking to prevent the lifting part 102 from moving accidentally. During the operation of the electromagnetic core 102a-2, the heat sink 102b-2 helps to dissipate the generated heat to prevent overheating, ensuring the stable operation of the electromagnetic core 102a-2 and the entire self-locking assembly 102b.

[0044] Example 2

[0045] Reference Figure 1-5 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that: the claw portion 203 includes a grasping component 203a arranged in the guide tube 104, and a fastening component 203b arranged under the grasping component 203a. The grasping component 203a directly contacts and grasps the reactor tank cover to ensure the stability and safety of the tank cover during the sealing process. The fastening component 203b is arranged under the grasping component 203a to provide additional fixation and support after the grasping component 203a grasps the tank cover, thereby ensuring the stability of the tank cover and preventing the tank cover from rotating or displacing during the lifting or moving process.

[0046] Compared with Example 1, further, the grasping assembly 203a includes a claw chuck 203a-1 arranged in the guide tube 104, a rotating block 203a-2 arranged on the claw chuck 203a-1, and a movable claw 203a-3 arranged under the rotating block 203a-2. The staff matches the diameter of the can cover by adjusting the position or shape of the claw chuck 203a-1. The rotating block 203a-2 is arranged on the claw chuck 203a-1, and provides necessary rotation or adjustment when the claw chuck 203a-1 contacts the can cover, so that the movable claw 203a-3 can correctly grasp the edge of the can cover.

[0047] Compared with Example 1, further, the fastening assembly 203b includes a limiting plate 203b-1 arranged on the movable claw 203a-3, and an anti-slip plate 203b-2 arranged on the limiting plate 203b-1. The limiting plate 203b-1 is used to limit the moving range of the movable claw 203a-3, ensuring that the movable claw 203a-3 can stably maintain the correct position after grasping the tank cover, while preventing the claw from excessively opening or closing, thereby protecting the edge of the tank cover from damage. The anti-slip plate 203b-2 provides additional friction when the movable claw 203a-3 grasps the tank cover, preventing the tank cover from sliding during lifting or moving, thereby improving the stability of the device.

[0048] The remaining structures are the same as those of Example 1.

[0049] Example 3

[0050] Reference Figure 1-5 , which is the third embodiment of the present invention, provides a method for using a pebble bed reactor tank cover sealing device, comprising:

[0051] When grabbing the tank cover, the lifting part 102 is started to move the electromagnetic lock 103 to the top of the reactor tank cover, and the cylinder 201 is started to move the claw part 203 to the predetermined position above the tank cover;

[0052] Operate the reversing valve 202 to raise the cylinder 201 to the upper limit position and maintain it, release the mechanical self-locking of the cylinder 201, and allow the lifting cylinder 201 to move downward until the grabbing assembly 203a contacts the tank cover;

[0053] Switch the reversing valve 202 to inflate the cylinder 201, so that the cylinder 201 drives the grabbing assembly 203a to descend into the tank cover;

[0054] Switch the reversing valve 202 to deflate the cylinder 201, and then the movable claw 203a-3 opens to grab the tank cover, and the electromagnetic reversing valve 202 is placed in the positive charging position, so that the cylinder 201 rises, driving the movable claw 203a-3 to bring the tank cover up to the preset position;

[0055] When the tank cover is put back, the electromagnetic reversing valve 202 is placed in the positive pressure charging position, and high-pressure air is supplied to the lower end of the cylinder 201, so that the cylinder 201 rises to the limit position and maintains it, and the mechanical self-locking of the cylinder 201 is released, so that the lifting cylinder 201 can move downward;

[0056] The electromagnetic reversing valve 202 is placed in the reverse pressure charging position, so that the lifting cylinder 201 of the tank cover sealing device drives the movable claw 203a-3 and the tank cover to descend, and the tank cover sealing operation is performed to reset the tank cover to the tank mouth;

[0057] After the tank cover is successfully removed or installed, the claw part 203 and the lifting part 102 are retracted to the initial position. The present invention ensures stability and safety in the process of sealing the reactor tank cover through the precise design of the electromagnetic lock 103 and the claw part 203, reducing the risk of operators contacting radioactive substances. The automated control system and the claw part 203 driven by the cylinder 201 can quickly and accurately locate and seal the tank cover, significantly improving the work efficiency of reactor maintenance and overhaul. The design of the self-locking component 102b and the limit stopper 102b-1 enhances the stability of the device during operation and prevents equipment damage or accidents caused by improper operation. The fastening component 203b of the claw part 203 ensures the sealing of the tank cover, prevents leakage of radioactive substances, and protects the environment and personnel safety.

[0058] Compared with Example 2, further, during operation, the fastening component 203b is used to prevent the tank cover from falling or loosening. The fastening component 203b can limit the movement range of the movable claw 203a-3, ensuring that the movable claw 203a-3 can stably maintain the correct position after grasping the tank cover, while preventing the claw from excessively opening or closing, thereby protecting the edge of the tank cover from damage, and providing additional friction when the movable claw 203a-3 grasps the tank cover, preventing the tank cover from sliding during lifting or moving, thereby improving the stability of the device.

[0059] Compared with the second embodiment, during operation, the self-locking assembly 102b is used to avoid misoperation by the staff, thereby improving the safety and reliability of the entire pebble bed reactor tank cover sealing device.

[0060] The remaining structure is the same as that of Example 2.

[0061] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, improvements, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0062] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0063] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A pebble bed reactor tank cover sealing device, characterized in that: include, A support unit (100) comprises a support frame (101), a lifting part (102) arranged on the support frame (101), an electromagnetic lock (103) arranged on the lifting part (102), and a guide tube (104) arranged on the support frame (101); The sealing unit (200) comprises a cylinder (201) arranged in the guide tube (104), a reversing valve (202) arranged below the cylinder (201), and a claw portion (203) arranged in the guide tube (104).

2. The pebble bed reactor tank cover sealing and removing device according to claim 1, characterized in that: The lifting part (102) comprises a driving component (102a) arranged on the supporting frame (101), and a self-locking component (102b) arranged on the driving component (102a).

3. The device for sealing and removing the tank cover of a pebble bed reactor according to claim 2, characterized in that: The driving component (102a) comprises a lifting plate (102a-1) arranged on the support frame (101), an electromagnet core (102a-2) arranged on the lifting plate (102a-1), and a valve stem (102a-3) arranged on the lifting plate (102a-1) and the electromagnet core (102a-2).

4. The device for sealing and removing the tank cover of a pebble bed reactor according to claim 3, characterized in that: The self-locking component (102b) comprises a limit stopper (102b-1) arranged on the valve stem (102a-3), and a heat dissipation plate (102b-2) arranged on the limit stopper (102b-1).

5. The device for sealing and removing the tank cover of a pebble bed reactor according to claim 4, characterized in that: The claw portion (203) comprises a grabbing component (203a) disposed in the guide tube (104), and a fastening component (203b) disposed under the grabbing component (203a).

6. The device for sealing and removing the tank cover of a pebble bed reactor according to claim 5, characterized in that: The grabbing assembly (203a) comprises a claw chuck (203a-1) arranged in the guide tube (104), a rotating block (203a-2) arranged on the claw chuck (203a-1), and a movable claw (203a-3) arranged under the rotating block (203a-2).

7. The device for sealing and removing the tank cover of a pebble bed reactor according to claim 6, characterized in that: The fastening assembly (203b) comprises a limiting plate (203b-1) arranged on the movable claw (203a-3), and an anti-slip plate (203b-2) arranged on the limiting plate (203b-1).

8. A method for using a pebble bed reactor tank cover sealing device, characterized in that: The device for sealing and removing the tank cover of a pebble bed reactor as claimed in claim 7 further comprises: When grabbing the tank cover, the lifting part (102) is started to move the electromagnetic lock (103) to the top of the reactor tank cover, and the cylinder (201) is started to move the claw part (203) to a predetermined position above the tank cover; The reversing valve (202) is operated to make the cylinder (201) rise to the upper limit position and maintain the position, and the mechanical self-locking of the cylinder (201) is released, so that the cylinder (201) can move downward until the grabbing assembly (203a) contacts the tank cover; Switching the reversing valve (202) to inflate the cylinder (201) causes the cylinder (201) to drive the grabbing assembly (203a) to descend into the tank cover; The reversing valve (202) is switched to deflate the cylinder (201), at which time the movable claw (203a-3) opens to grasp the tank cover, and the reversing valve (202) is placed in a positive pressure-charging position, so that the cylinder (201) rises, driving the movable claw (203a-3) to carry the tank cover to a preset position; When the tank cover is replaced, the reversing valve (202) is placed in the positive pressure charging position, and high-pressure air is supplied to the lower end of the cylinder (201), so that the cylinder (201) rises to the limit position and remains there, and the mechanical self-locking of the cylinder (201) is released, so that the cylinder (201) can move downward; The reversing valve (202) is placed in a reverse pressure charging position, so that the cylinder (201) drives the movable claw (203a-3) and the tank cover to descend, performs a tank cover sealing operation, and resets the tank cover to the tank mouth; After the can cover is successfully removed or installed, the claw portion (203) and the lifting portion (102) are retracted to the initial position.

9. The method for using the pebble bed reactor tank cover sealing device according to claim 8, characterized in that: During operation, the fastening assembly (203b) is used to prevent the tank cover from falling off or coming loose.

10. The method for using the pebble bed reactor tank cover sealing device according to claim 9, characterized in that: During operation, the self-locking component (102b) can be used to prevent workers from operating incorrectly.

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