Tank plug grabbing device and method for fuel storage tank

Abstract

The invention relates to the technical field of tank plug grabbing, in particular to a device and method for grabbing a tank plug of a fuel storage tank. The mounting unit comprises a threaded rod connected with the end part of the long rod, a flange arranged on the threaded rod in a threaded manner, a connecting assembly arranged on the flange, and a gear chamber which is arranged at the end part of the connecting assembly and is provided with a cavity; the limiting unit comprises a first gear rotationally arranged in the gear chamber cavity and connected with the end of the threaded rod, and two telescopic claws which are arranged in the gear chamber cavity in a sliding mode, meshed with the first gear and capable of sliding in the opposite directions. According to the grabbing device and method for the tank plug of the fuel storage tank, the conveying unit can be achieved through the long rod, the telescopic claw can enter the tank plug along with conveying of the long rod when retracting, then the telescopic claw stretches out to be connected with the top wall of the tank plug in a hung mode, and finally the telescopic claw and the tank plug can be pulled out together by pulling out the long rod.

Description

Technical Field

[0001] The invention relates to the technical field of tank plug grabbing, and in particular to a tank plug grabbing device and method for a fuel storage tank. Background Art

[0002] The high-temperature gas-cooled reactor uses graphite-coated fuel balls as fuel elements and helium as coolant. It has the advantages of good safety, high power generation efficiency and good economy. It has been listed by the International Atomic Energy Agency as one of the fourth-generation reactor development types.

[0003] Since the fuel elements of high-temperature gas-cooled reactors are different from those of pressurized water reactor nuclear power plants, the spherical spent fuel elements discharged from the core need to be stored in suitable spent fuel storage tanks. In order to reduce the manufacturing cost of spent fuel storage tanks, spent fuel storage tanks are designed as thin-walled containers. In order to prevent the radioactive gas generated by the decay of spent fuel during storage from escaping into the external environment, the boundary line between the tank plug and the tank mouth needs to be welded and sealed.

[0004] For tank plugs with failed welding, a cutting machine is required to cut the weld and then remove the discarded tank plugs. For extracting the discarded tank plugs, the present invention provides a tank plug grabbing device and method for fuel storage tanks. Summary of the invention

[0005] In view of the above problems existing in the existing fuel tank plug grabbing device and method, the present invention is proposed.

[0006] Therefore, one of the objects of the present invention is to provide a fuel tank plug gripping device, the purpose of which is to extract the discarded tank plug.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a device for grabbing plugs of fuel storage tanks, comprising a long rod;

[0008] The mounting unit comprises a threaded rod connected to the end of the long rod, a flange threadedly arranged on the threaded rod, a connecting assembly arranged on the flange, and a gear chamber having a cavity and arranged at the end of the connecting assembly; and

[0009] The limiting unit includes a gear 1 which is rotatably arranged in the cavity of the gear chamber and connected to the end of the threaded rod, and two telescopic claws which are slidably arranged in the cavity of the gear chamber and meshed with the gear 1 and can slide toward each other.

[0010] As a preferred solution of the fuel tank plug grabbing device of the present invention, the gear chamber comprises an upper cover and a lower cover, and the lower cover is provided with a rectangular groove;

[0011] The gear 1 is rotatably mounted in the rectangular groove, and the threaded rod is rotatably passed through the upper cover and connected to the gear 1;

[0012] The two telescopic claws are respectively arranged on two sides of the rectangular groove.

[0013] As a preferred solution of the fuel tank plug grabbing device described in the present invention, the telescopic claw includes a rack slidably arranged on the side of the rectangular groove and meshing with the gear, and a raised bar arranged on the end of the rack.

[0014] As a preferred solution of the fuel tank plug grabbing device of the present invention, the connection assembly includes a limit rod arranged on the gear chamber, and a limit block arranged on the limit rod;

[0015] The end of the limiting rod slides through the flange, and the flange is located between the limiting block and the gear chamber.

[0016] As a preferred solution of the fuel tank plug grabbing device of the present invention, a spring is sleeved on the limiting rod located between the flange and the gear chamber.

[0017] As a preferred solution of the fuel tank plug grabbing device of the present invention, a plurality of positioning claws are installed at the bottom of the flange, and an arc-shaped gear ring is provided at the bottom of the positioning claws.

[0018] As a preferred solution of the fuel tank plug grabbing device of the present invention, there is a cushion block at the bottom of the positioning claw, and the height of the cushion block is lower than the height of the arc gear ring.

[0019] As a preferred solution of the fuel tank plug grabbing device of the present invention, the other end of the long rod is connected to a hand wheel.

[0020] The beneficial effects of this device are as follows: the unit can be transported by a long rod, wherein the telescopic claw can enter the tank plug along with the long rod when it is retracted, and then the telescopic claw is extended to be hooked with the top wall of the tank plug, and finally the telescopic claw and the tank plug can be pulled out together by pulling out the long rod.

[0021] Another object of the present invention is to provide a device for grabbing plugs of fuel tanks, the purpose of which is to extract discarded plugs.

[0022] In order to solve the above technical problems, the present invention provides the following technical solutions: a method for grabbing a plug of a fuel storage tank; having a telescopic claw that can slide along a first direction;

[0023] And the telescopic claw can move along the second direction; wherein the angle between the first direction and the second direction is not zero.

[0024] As a preferred solution of the method for grabbing the plug of a fuel tank of the present invention, there are two telescopic claws, which can move synchronously in opposite directions.

[0025] The beneficial effects of the present invention are as follows: the telescopic claw retracts along a first direction to facilitate insertion into the tank plug, then extends along the first direction to be hooked with the tank plug, and then moves along a second direction to pull out the tank plug. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0027] Figure 1 The figure is a schematic diagram of the overall structure of the fuel tank plug grabbing device of the present invention.

[0028] Figure 2 The present invention is a schematic diagram of the structure of the installation unit of the fuel tank plug grabbing device.

[0029] Figure 3 The present invention is a schematic diagram of the positioning claw structure of the fuel tank plug grasping device.

[0030] Figure 4 The present invention is a schematic diagram of the telescopic claw structure of the fuel tank plug grasping device.

[0031] Figure 5 This is a schematic diagram of the initial working state of the fuel tank plug grabbing device of the present invention.

[0032] Figure 6 The present invention is a schematic diagram of the working extension state of the fuel tank plug grasping device of the present invention.

[0033] Figure 7 The present invention is a schematic diagram of the working clamping state of the fuel tank plug grasping device of the present invention. DETAILED DESCRIPTION

[0034] 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.

[0035] 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.

[0036] 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 does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0037] 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.

[0038] Example 1, reference Figure 1-Figure 7 , which is the first embodiment of the present invention, provides a device for grabbing a plug of a fuel storage tank, the device comprising a long rod 100, a mounting unit 200 and a limiting unit 300.

[0039] The mounting unit 200 includes a threaded rod 201 connected to the end of the long rod 100, a flange 202 threadedly arranged on the threaded rod 201, a connecting assembly 203 arranged on the flange 202, and a gear chamber 204 arranged at the end of the connecting assembly 203 and having a cavity; wherein one end of the long rod 100 is fixedly connected to the threaded rod 201, and the two can be fixed by welding, rivets or other connecting methods; wherein a hand wheel 101 is fixed to the other end of the long rod 100, and the rotation of the long rod 100 and the threaded rod 201 is controlled by turning the hand wheel 101.

[0040] The connecting assembly 203 includes a limit rod 203a arranged on the gear chamber 204, and a limit block 203b arranged on the limit rod 203a; the end of the limit rod 203a slides through the flange 202, and the flange 202 is located between the limit block 203b and the gear chamber 204, and the limit rod 203a limits the positional relationship between the gear chamber 204 and the flange 202, so that the gear chamber 204 can only slide along the limit rod 203a to move closer to or away from the flange 202, and the limit block 203b and the limit rod 203a can be connected by welding, threaded connection, riveting or other fixing methods.

[0041] When the threaded rod 201 rotates relative to the flange 202 , the threaded rod 201 can drive the gear chamber 204 to move relative to the flange 202 , and the gear chamber 204 and the flange 202 can move away from or closer to each other by controlling the rotation direction of the threaded rod 201 .

[0042] Furthermore, a spring 203 c is sleeved on the limiting rod 203 a between the flange 202 and the gear chamber 204 .

[0043] The limiting unit 300 includes a gear 1 301 rotatably disposed in the cavity of the gear chamber 204 and connected to the end of the threaded rod 201 , and two telescopic claws 302 slidably disposed in the cavity of the gear chamber 204 and meshing with the gear 1 301 and capable of sliding toward each other.

[0044] Among them, the end of the threaded rod 201 is connected to the gear 1 301, and when the threaded rod 201 rotates, it can drive the gear 1 301 to rotate synchronously. When the gear 1 301 rotates, it drives the two telescopic claws 302 to extend or retract. The telescopic claws 302 and the gear 1 301 are meshed through convex teeth, and the rotation of the gear 1 301 can be converted into the movement of the telescopic claws 302, and then the extension or retraction of the telescopic claws 302 is achieved by controlling the rotation direction of the threaded rod 201.

[0045] During use, if Figure 5-Figure 7 As shown, first, by rotating the threaded rod 201, the gear chamber 204 is moved away from the flange 202, and the telescopic claw 302 is retracted into the cavity of the gear chamber 204. At this time, the gear chamber 204 is sent into the interior of the tank plug by the long rod 100, and the flange 202 is against the tank mouth. This is the initial state, and there is friction between the flange 202 and the tank mouth. Then, the threaded rod 201 is rotated in the opposite direction. At this time, the flange 202 is stationary relative to the tank mouth, and the gear chamber 204 will approach the flange 202. At the same time, under the rotation of the threaded rod 201, the gear 1 301 extends the telescopic claw 302. This is the extended state. When the gear chamber 204 approaches the flange 202 with the extended telescopic claw 302, it will contact the top wall of the tank plug, driving the tank plug to move and contact the flange 202. This is the clamping state, so that the tank plug is initially separated from the tank mouth. Finally, the long rod 100 is moved to pull the entire gear chamber 204 and the tank plug out of the tank mouth to remove the tank plug.

[0046] Example 2, reference Figure 3 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that a plurality of positioning claws 202a are installed at the bottom of the flange 202, and an arc-shaped gear ring 202b is provided at the bottom of the positioning claws 202a, wherein the arc-shaped gear ring 202b can further increase the friction between the flange 202 and the tank mouth when in contact with the tank mouth, thereby ensuring that the flange 202 will not rotate synchronously with the threaded rod 201 when the threaded rod 201 is rotated.

[0047] Furthermore, there is a pad 202c at the bottom of the positioning claw 202a, and the height of the pad 202c is lower than the height of the arc-shaped gear ring 202b. When the gear chamber 204 approaches the flange 202 with the extended telescopic claw 302, it will contact the top wall of the tank plug, and at the same time drive the tank plug to move and contact the pad 202c. The height difference between the pad 202c and the arc-shaped gear ring 202b is the distance of the tank mouth where the tank plug is initially separated. Due to the difficulty of initial separation, the spiral force is converted into a moving pulling force at this time, which helps to separate the tank plug and facilitate the subsequent direct removal of the tank plug.

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

[0049] Example 3, reference Figure 2 and Figure 4 , which is the third embodiment of the present invention. This embodiment is different from the second embodiment in that: the gear chamber 204 includes an upper cover 204a and a lower cover 204b, and the lower cover 204b is provided with a rectangular groove 204c; the upper cover 204a and the lower cover 204b are fixedly connected, and a gear chamber 204 cavity is formed between the upper cover 204a, the lower cover 204b and the rectangular groove 204c.

[0050] The gear 1 301 is rotatably installed in the rectangular groove 204c, and the threaded rod 201 is rotatably passed through the upper cover 204a to be connected with the gear 1 301; the two telescopic claws 302 are respectively arranged on both sides of the rectangular groove 204c.

[0051] Furthermore, the telescopic claw 302 includes a rack 302a slidably arranged on the side of the rectangular groove 204c and meshing with the gear 1 301, and a raised bar 302b arranged at the end of the rack 302a. When the gear 1 301 rotates, it can drive the chain racks 302a to move in opposite directions, thereby driving the two raised bars 302b to extend or retract differently. The raised bar 302b can be abutted against the inner wall of the top of the tank plug, so as to facilitate the pulling of the tank plug out of the tank mouth; wherein a sliding block is installed on the side of the rectangular groove 204c, which is connected to the rack 302a through the sliding block, so as to realize the function of the rack 302a sliding relative to the rectangular groove 204c.

[0052] Alternatively, the telescopic claw 302 includes a U-shaped frame slidably arranged in the rectangular groove 204c, one side of the U-shaped frame is set as a rack 302a, and a raised bar 302b is installed at the end, and the other side of the U-shaped frame is higher than the rack 302a side. The two U-shaped frames can be plugged together, and the design of the U-shaped frame can be easily limited in the rectangular groove 204c, avoiding the installation of a slider in the rectangular groove 204c.

[0053] The remaining structure is the same as that of Example 2.

[0054] Example 4, reference Figure 1, which is a fourth embodiment of the present invention, provides a method for grabbing a plug of a fuel storage tank, the method comprising a telescopic claw 302 that can slide along a first direction;

[0055] And the telescopic claw 302 can move along the second direction; wherein the angle between the first direction and the second direction is not zero.

[0056] The angle between the first direction and the second direction is not zero, so that the telescopic claw 302 can be inserted into the tank plug, and the telescopic claw 302 can be extended along the first direction, so that the length of the telescopic claw 302 is greater than the entrance of the tank plug, so that when the telescopic claw 302 moves along the second direction, the tank plug can be pulled out.

[0057] Furthermore, there are two telescopic claws 302, and they can move synchronously in opposite directions. The arrangement of the two telescopic claws 302 can improve the force uniformity of the tank plug, making it easier to pull out the tank plug.

[0058] 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 device for grabbing plugs of fuel tanks, characterized in that: include, Long rod (100); The mounting unit (200) comprises a threaded rod (201) connected to the end of the long rod (100), a flange (202) threadedly arranged on the threaded rod (201), a connecting assembly (203) arranged on the flange (202), and a gear chamber (204) arranged at the end of the connecting assembly (203) and having a cavity; as well as, The limiting unit (300) comprises a gear 1 (301) rotatably disposed in the cavity of the gear chamber (204) and connected to the end of the threaded rod (201), and two telescopic claws (302) slidably disposed in the cavity of the gear chamber (204) and meshing with the gear 1 (301) and capable of sliding toward each other.

2. The fuel tank plug grabbing device according to claim 1, characterized in that: The gear chamber (204) comprises an upper cover (204a) and a lower cover (204b), and a rectangular groove (204c) is provided on the lower cover (204b); The gear one (301) is rotatably mounted in the rectangular groove (204c), and the threaded rod (201) is rotatably passed through the upper cover (204a) to be connected to the gear one (301); The two telescopic claws (302) are respectively arranged on both sides of the rectangular groove (204c).

3. The fuel tank plug grabbing device according to claim 2, characterized in that: The telescopic claw (302) comprises a rack (302a) slidably arranged on the side of the rectangular groove (204c) and meshed with the gear 1 (301), and a protruding strip (302b) arranged at the end of the rack (302a).

4. The fuel tank plug grabbing device according to any one of claims 1 to 3, characterized in that: The connection assembly (203) comprises a limiting rod (203a) arranged on the gear chamber (204), and a limiting block (203b) arranged on the limiting rod (203a); The end of the limiting rod (203a) slides through the flange (202), and the flange (202) is located between the limiting block (203b) and the gear chamber (204).

5. The fuel tank plug grabbing device according to claim 4, characterized in that: A spring (203c) is sleeved on the limiting rod (203a) located between the flange (202) and the gear chamber (204).

6. The fuel tank plug grabbing device according to any one of claims 1 to 3, characterized in that: A plurality of positioning claws (202a) are installed at the bottom of the flange (202), and an arc-shaped gear ring (202b) is provided at the bottom of the positioning claws (202a).

7. The fuel tank plug grabbing device according to claim 6, characterized in that: A cushion block (202c) is also provided at the bottom of the positioning claw (202a), and the height of the cushion block (202c) is lower than the height of the arc-shaped gear ring (202b).

8. The fuel tank plug grabbing device according to claim 1, characterized in that: The other end of the long rod (100) is connected to a hand wheel (101).

9. A method for grabbing a plug of a fuel tank, characterized in that: A telescopic claw (302) is provided which can slide along a first direction; Furthermore, the telescopic claw (302) is capable of moving along a second direction; wherein an angle between the first direction and the second direction is not zero.

10. The method for grabbing a plug of a fuel tank according to claim 9, characterized in that: The telescopic claws (302) are two and can move synchronously in opposite directions.

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