Device for researching underwater taking and placing of reactor core filling block in reactor refueling period

Abstract

The invention relates to the technical field of taking and placing tools, and provides a device for researching underwater taking and placing of a reactor core filling block in the material stacking and changing period, the device comprises a cylinder, a sliding rod is coaxially and slidably connected in the cylinder, one end of the sliding rod is provided with an execution mechanism used for driving the sliding rod to move and reset, and the other end of the sliding rod is connected with a grabbing assembly; the grabbing assembly comprises a positioning sleeve, grabbing hooks and an ejector rod, the positioning sleeve is connected with the barrel and used for being inserted into a round hole formed in the positioning filling block, the grabbing hooks are movably connected into the positioning sleeve in pairs through pin shafts, the ejector rod is slidably connected with the positioning sleeve, and one end of the ejector rod is connected with the sliding rod. The other end of the ejector rod abuts against the middle of the paired grabbing hooks and is used for opening or closing the grabbing hooks to take and place the packing block, the locating sleeve is inserted into the round hole in the locating packing block, the sliding rod is driven to move or reset through the executing mechanism, the ejector rod is driven to abut against the grabbing hooks, taking and placing of the packing block are achieved, locating operation is convenient, and the packing block is effectively prevented from falling off. And the operation safety and reliability are improved.

Description

Technical Field

[0001] The invention relates to the technical field of picking and placing tools, and in particular to a device for underwater picking and placing of core filling blocks during research reactor refueling. Background Art

[0002] Research reactors are mainly used for tasks such as material irradiation testing and isotope production. During the material irradiation testing process, the amount of nuclear fuel loaded and the number of irradiation channels 90 will vary according to different irradiation tasks. After completing the irradiation task, the corresponding irradiation device 92 needs to be pulled out of the core. Figure 5 , 6 As shown, after being pulled out, a reserved hole 930 of corresponding size will be formed in the core, and then the filling block 94 will be positioned and backfilled underwater. After the backfilling is completed, the upper end surface of the filling block 94 is flush with the upper end surface of the grid plate 93, and a circular hole 940 of the same size as the grid plate 93 is provided inside the filling block 94 to facilitate the insertion of more fuel elements and isotope assemblies.

[0003] Since the distance between the end face of the flat top cover 917 of the research reactor and the grid plate 93 is about 9 meters, the operator needs to use a long-handled tool to grab, transport and backfill the packing block 94 underwater. At the same time, the irradiator 92 and the control rod guide tube in the reactor are higher than the upper end face of the grid plate 93, which blocks the operator's line of sight. In addition, the matching clearance between the packing block 94 and the reserved hole 930 of the grid plate 93 is only 0.1 mm. Therefore, during the installation process, the operator must rotate the packing block 94 underwater to ensure that the positioning pin of the packing block 94 is aligned with the positioning groove 420 on the reserved hole 930 and embedded in the reserved hole 930 of the grid plate 93. If the packing block 94 is slightly tilted, it may not be installed in place or the two may be stuck to each other, making the positioning and placement operations difficult. At the same time, during the placement and transportation process, there is a safety risk that the packing block 94 will fall off the tool. Summary of the invention

[0004] The purpose of the present invention is to provide a device for underwater placement of core filling blocks during reactor refueling, which solves the above technical problems, facilitates positioning operations, effectively prevents the filling blocks from falling, and improves the safety and reliability of operations.

[0005] The present invention is achieved through the following technical solutions: a device for underwater placement of core filling blocks during research of reactor refueling, comprising a cylinder, a sliding rod coaxially slidably connected in the cylinder, an actuator for driving the sliding rod to move and reset is provided at one end of the sliding rod, a grab assembly is connected to the other end of the sliding rod, the grab assembly comprises a positioning sleeve, a grab hook and a push rod, the positioning sleeve is connected to the cylinder for inserting into a circular hole opened on the positioning filling block, the grab hook is movably connected in pairs in the positioning sleeve through a pin shaft, the push rod is slidably connected to the positioning sleeve, one end of the push rod is connected to the sliding rod, and the other end of the push rod abuts against the middle of the paired grab hooks for opening or closing the grab hooks to place the filling block.

[0006] Furthermore, the actuator includes a slider, a joint and a return spring. The slider is sealingly and slidably connected in the cylinder. The bottom end of the slider is connected to the top of the sliding rod. The top of the slider is provided with a piston sealingly and slidably connected to the inner wall of the cylinder. The inner wall of the cylinder, the piston and the slider together form a cavity. The joint is used to connect the air pump and the cavity, and the force surface of the piston on one side of the cavity is larger than the force surface of the slider on one side of the cavity. The return spring is limited and abuts against the top of the piston.

[0007] Preferably, the side wall of the slider is connected with an indicator column, and the side wall of the cylinder is provided with a first limit bar hole for movably abutting against the limit indicator column.

[0008] Furthermore, the grab hook comprises a first abutting portion, a second abutting portion and a grabbing portion, the first abutting portion and the grabbing portion form a lever with the pin as a fulcrum, and the second abutting portion and the grabbing portion form a lever with the pin as a fulcrum.

[0009] Preferably, the push rod comprises a straight rod, a convex ball and a guide cone head from top to bottom, the convex ball is movably abutted against the first abutment portion or the second abutment portion, and a groove for transitionally accommodating the convex ball is provided between the first abutment portion and the second abutment portion.

[0010] Preferably, a limiting ring is fixedly mounted on the straight rod and is movably abutted against the positioning sleeve for limiting the sliding movement of the push rod.

[0011] Furthermore, a connecting seat for connecting multiple positioning sleeves is provided at the bottom of the cylinder, and the sliding rod is fixed with a connecting plate for connecting the corresponding top rods of the multiple positioning sleeves through a pin. The connecting plate is movably sleeved on the cylinder, and a second limit bar hole for movably abutting the limit pin is opened on the cylinder.

[0012] Furthermore, the cylinder body comprises an upper connecting cylinder, an extension cylinder and a lower connecting cylinder which are connected in sequence, and the sliding rod comprises an extension rod and a lower connecting rod which are connected in sequence.

[0013] Furthermore, a top cover is threadedly and sealingly connected to the top of the cylinder, and a lifting ring is movably connected to the top cover.

[0014] Furthermore, a camera for observing the taking and placing of the filling blocks is provided on the outer wall of the cylinder.

[0015] The present invention has at least the following advantages and beneficial effects:

[0016] (1) The positioning sleeve is inserted into the circular hole on the positioning stuffing block, and the actuator drives the sliding rod to move or reset, driving the push rod to abut against the grab hook to realize the taking and placing of the stuffing block, which is convenient for positioning operation, effectively prevents the stuffing block from falling, and improves the safety and reliability of operation;

[0017] (2) The pressure difference acts on the piston to move and compress the return spring. After the air pump is turned off, the filling block can be effectively grasped and self-locked, thereby improving the safety of operation;

[0018] (3) Through the cooperation between the first limit bar hole and the indicator column, the cooperation between the latch pin and the second lower bar hole, and the cooperation between the limit ring and the positioning sleeve, multiple limits on the moving stroke of the push rod are achieved, ensuring the stability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 A schematic diagram of the structure of a device provided by the present invention for underwater removal and placement of core filling blocks during a research reactor refueling;

[0021] Figure 2 For the present invention Figure 1 A partial enlarged view of the middle A;

[0022] Figure 3 A schematic diagram of the structure of a positioning sleeve in a device for underwater placement and removal of core filling blocks during a research reactor refueling provided by the present invention;

[0023] Figure 4 A schematic diagram of the functions of a grab hook and a mandrel in a device for underwater removal and placement of a core packing block during a reactor refueling provided by the present invention;

[0024] Figure 5 It is a structural schematic diagram of a core in the prior art;

[0025] Figure 6 It is a schematic diagram of the coordination of the grid plate and the filling block in the prior art;

[0026] Icon: 1- cylinder, 10- cavity, 11- first limit bar hole, 12- second limit bar hole, 101- upper connection cylinder, 102- extension cylinder, 103- lower connection, 2- sliding rod, 201- extension rod, 202- lower connection rod, 3- actuator, 31- slider, 32- connector, 33- return spring, 34- piston, 35- indicator column, 4- grab assembly, 41- positioning sleeve, 42- grab hook, 420- groove, 42 1-first abutment portion, 422-second abutment portion, 423-grasping portion, 43-top rod, 431-straight rod, 432-convex ball, 433-guide cone head, 434-limiting ring, 44-pin shaft, 5-connecting seat, 6-connecting plate, 61-latch pin, 7-top cover, 8-hanging ring, 90-irradiation channel, 91-flat top cover, 92-irradiation device, 93-grid plate, 930-reserved hole, 94-filling block, 940-round hole. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Example

[0030] like Figure 1-4 As shown, in this embodiment, a device for underwater placement of core plugging blocks during the research reactor refueling is mainly disclosed, including a cylinder 1, a sliding rod 2 is coaxially slidably connected in the cylinder 1, an actuator 3 for driving the sliding rod 2 to move and reset is provided at one end of the sliding rod 2, and a grab assembly 4 is connected to the other end of the sliding rod 2, and the grab assembly 4 includes a positioning sleeve 41, a grab hook 42 and a push rod 43, the positioning sleeve 41 is connected to the cylinder 1 for inserting and positioning the circular hole 940 opened on the plugging block 94, the grab hook 42 is movably connected in pairs in the positioning sleeve 41 through a pin shaft 44, the push rod 43 is slidably connected to the positioning sleeve 41, one end of the push rod 43 is connected to the sliding rod 2, and the other end of the push rod 43 abuts against the middle of the paired grab hooks 42 for opening or closing the grab hooks 42 to take and place the plugging block 94;

[0031] Specifically, the cylinder body 1 can be composed of an upper connecting cylinder 101, an extension cylinder 102 and a lower connecting cylinder connected in sequence, and the sliding rod 2 can be composed of an extension rod 201 and a lower connecting rod 202 connected in sequence. The upper connecting cylinder 101, the lower connecting cylinder and the lower connecting rod 202 can be manufactured according to unified standards, and by replacing the extension cylinder 102 and the extension rod 201 of different lengths, it can adapt to the taking and placing of the filling block 94 under different water depths;

[0032] The working method and principle of this embodiment are explained by taking the grabbing of the stuffing block 94 as an example: first, the sliding rod 2 is driven to move by the actuator 3, thereby driving the push rod 43 to move synchronously, and the push rod 43 acts on the grab hook 42 to close it and completely retract it into the positioning sleeve 41, and then the device is lowered to position the positioning sleeve 41 and insert it into the round hole 940 on the stuffing block 94. The actuator 3 performs reset, and the sliding rod 2 moves in the opposite direction, driving the push rod 43 to move synchronously, and the push rod 43 acts on the grab hook 42 to open it. The grab hook 42 partially extends out of the positioning sleeve 41, thereby locking the stuffing block 94 by clamping, and the lifting device can realize the grabbing of the stuffing block 94; it is convenient for positioning and grabbing, and effectively prevents the stuffing block 94 from falling, thereby improving the safety and reliability of operation.

[0033] Furthermore, in the specific implementation, Figure 2 As shown, the actuator 3 provided in the embodiment of the present invention includes a slider 31, a joint 32 and a return spring 33. The slider 31 is sealingly slidably connected in the cylinder 1. The bottom end of the slider 31 is connected to the top of the sliding rod 2. The top of the slider 31 is provided with a piston 34 sealingly slidably connected to the inner wall of the cylinder 1. The inner wall of the cylinder 1, the piston 34 and the slider 31 are surrounded to form a cavity 10. The joint 32 is used to connect the air pump and the cavity 10, and the force-bearing surface of the piston 34 on one side of the cavity 10 is larger than the force-bearing surface of the slider 31 on one side of the cavity 10. The return spring 33 is limited to abut against the top of the piston 34. Specifically, air is inflated into the cavity 10 through the joint 32 through an external air pump. Since the force-bearing surface of the piston 34 on one side of the cavity 10 is larger than the force-bearing surface of the slider 31 on one side of the cavity 10, under the action of the pressure difference, the piston 34 is pushed upward, compressing the reset spring 33, and moving upward through the sliding rod 2 and the push rod 43 to close the grab hook 42. After the positioning sleeve 41 is accurately inserted and positioned, the air pump is turned off, and the piston 34 moves downward under the reset action of the reset spring 33, so that the sliding rod 2 and the push rod 43 move upward, abutting the grab hook 42 to open and lock the stuffing block 94.

[0034] Preferably, an indicator column 35 is connected to the side wall of the slider 31, and a first limit bar hole 11 for movably abutting the limit indicator column 35 is opened on the side wall of the cylinder 1; specifically, the indicator column 35 can be connected to the side wall of the slider 31 by means of a screw thread, and move synchronously with the sliding rod 2 to indicate the relative position of the sliding rod 2 in the cylinder 1. The first limit bar hole 11 is arranged axially along the cylinder 1. On the one hand, it can limit the radial position of the sliding rod 2, and on the other hand, it can limit the axial movement stroke of the sliding rod 2 and the push rod 43.

[0035] Furthermore, in the specific implementation, Figure 3 , 4 As shown, the above-mentioned grab hook 42 provided in the embodiment of the present invention includes a first abutment portion 421, a second abutment portion 422 and a grabbing portion 423, the first abutment portion 421 and the grabbing portion 423 form a lever with the pin shaft 44 as a fulcrum, and the second abutment portion 422 and the grabbing portion 423 form a lever with the pin shaft 44 as a fulcrum; the top rod 43 includes a straight rod 431, a convex ball 432 and a guide cone head 433 from top to bottom, the convex ball 432 is movably abutted with the first abutment portion 421 or the second abutment portion, and a groove 420 for transitionally accommodating the convex ball 432 is provided between the first abutment portion 421 and the second abutment portion 422; it should be noted that the grab hook 42 is Z-shaped as a whole, and the pin shaft 44 is hinged With the upper part of the grab hook 42, the push rod 43 is inserted between the paired grab hooks 42, and the guide cone head 433 pushes the grab hooks 42 to both sides, so that the convex ball 432 is smoothly placed between the grooves 420 of the grab hook 42, and when the push rod 43 moves upward, the convex ball 432 abuts against the first abutment portion 421, and pries the paired grab hooks 42 closer to each other and closed, and retracted into the positioning sleeve 41, and the air pump continues to work, that is, the grab hooks 42 are always received in the positioning sleeve 41; when the push rod 43 moves downward, the convex ball 432 abuts against the second abutment portion 422, so that the paired grab hooks 42 are separated from each other and opened, and extend out of the positioning sleeve 41, which plays a clamping role, and due to the action of the reset spring 33, the self-locking function is realized.

[0036] Preferably, a limiting ring 434 is sleeved and fixed on the straight rod 431 and is movably abutted against the positioning sleeve 41 for limiting the sliding of the limiting push rod 43 , thereby assisting the movement stroke of the limiting push rod 43 .

[0037] Furthermore, in the specific implementation, Figure 1As shown, a connecting seat 5 for connecting a plurality of positioning sleeves 41 is provided at the bottom of the above-mentioned cylinder 1 provided in an embodiment of the present invention, and a connecting plate 6 for connecting a plurality of positioning sleeves 41 corresponding to push rods 43 is fixed to the sliding rod 2 through a pin 61, and the connecting plate 6 is movably sleeved on the cylinder 1, and a second limiting strip hole 12 for movably abutting the limiting pin 61 is opened on the cylinder 1; it should be noted that a plurality of positioning sleeves 41 are connected to the bottom of the connecting seat 5 through threaded cooperation, and the positioning sleeves 41 are tightly fixed with connecting nuts, and the installation position relationship of the plurality of positioning sleeves 41 on the connecting seat 5 should be kept corresponding to the plurality of circular holes 940 opened on the filling block 94 to ensure smooth insertion and positioning; the connecting plate 6 is fixed in series to the end of the sliding rod 2 through the pin 61, and the push rod 43 is fastened to the connecting plate 6 through a nut, so that the push rod 43, the connecting plate 6 and the sliding rod 2 form a whole and move synchronously, which ensures the structural strength while facilitating maintenance and replacement.

[0038] Furthermore, in the specific implementation, Figure 1 , 2 As shown, the top of the cylinder 1 provided in the embodiment of the present invention is threadedly sealed and connected with a top cover 7, and the top cover 7 is movably connected with a lifting ring 8; specifically, the reset spring 33 acts between the piston 34 and the top cover 7, and the top cover 7 is detachably connected to the top of the cylinder 1, which is convenient for the replacement of the reset spring 33 and the sealing maintenance of the piston 34; in addition, the outer wall of the cylinder 1 is provided with a camera for observing the placement and removal of the stuffing block 94, which enables the operator to operate and locate and promptly discover and deal with potential problems, thereby improving the accuracy and safety of the operation.

[0039] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A device for underwater removal and placement of core packing blocks during research reactor refueling, characterized in that: The utility model comprises a cylinder (1), wherein a sliding rod (2) is coaxially slidably connected inside the cylinder (1), an actuator (3) for driving the sliding rod (2) to move and reset is provided at one end of the sliding rod (2), and a grab assembly (4) is connected at the other end of the sliding rod (2), and the grab assembly (4) comprises a positioning sleeve (41), a grab hook (42) and a push rod (43), wherein the positioning sleeve (41) is connected to the cylinder (1) and is used for inserting into a circular hole (940) provided on a positioning filling block (94), the grab hook (42) is movably connected in pairs in the positioning sleeve (41) through a pin shaft (44), the push rod (43) is slidably connected to the positioning sleeve (41), one end of the push rod (43) is connected to the sliding rod (2), and the other end of the push rod (43) abuts against the middle of the paired grab hooks (42) for opening or closing the grab hooks (42) to take and place the filling block (94).

2. A device for underwater removal and placement of core packing blocks during research reactor refueling as claimed in claim 1, characterized in that: The actuator (3) comprises a slider (31), a joint (32) and a return spring (33); the slider (31) is sealingly slidably connected in the cylinder (1); the bottom end of the slider (31) is connected to the top end of the sliding rod (2); the top end of the slider (31) is provided with a piston (34) sealingly slidably connected to the inner wall of the cylinder (1); the inner wall of the cylinder (1), the piston (34) and the slider (31) together form a cavity (10); the joint (32) is used to connect the air pump and the cavity (10); and the force-bearing surface of the piston (34) on one side of the cavity (10) is larger than the force-bearing surface of the slider (31) on one side of the cavity (10); the return spring (33) is limitedly abutted against the top end of the piston (34).

3. A device for underwater removal and placement of core packing blocks during research reactor refueling as claimed in claim 2, characterized in that: The side wall of the slider (31) is connected to an indicator column (35), and the side wall of the cylinder (1) is provided with a first limiting bar hole (11) for movably abutting against and limiting the position of the indicator column (35).

4. A device for underwater removal and placement of core packing blocks during research reactor refueling as claimed in claim 1, characterized in that: The grab hook (42) comprises a first abutting portion (421), a second abutting portion (422) and a grabbing portion (423); the first abutting portion (421) and the grabbing portion (423) form a lever with the pin shaft (44) as a fulcrum, and the second abutting portion (422) and the grabbing portion (423) form a lever with the pin shaft (44) as a fulcrum.

5. A device for underwater removal and placement of core packing blocks during research reactor refueling as claimed in claim 4, characterized in that: The push rod (43) comprises, from top to bottom, a straight rod (431), a convex ball (432) and a guide cone head (433); the convex ball (432) is movably abutted against the first abutting portion (421) or the second abutting portion; a groove (420) for transitionally accommodating the convex ball (432) is provided between the first abutting portion (421) and the second abutting portion (422).

6. A device for underwater removal and placement of core packing blocks during research reactor refueling as claimed in claim 5, characterized in that: A limiting ring (434) is sleeved and fixed on the straight rod (431) and is movably abutted against the positioning sleeve (41) for limiting the sliding of the push rod (43).

7. The device for underwater removal and placement of core packing blocks during research reactor refueling as claimed in claim 1, characterized in that: A connecting seat (5) for connecting a plurality of the positioning sleeves (41) is provided at the bottom of the cylinder (1); a connecting plate (6) for connecting a plurality of the positioning sleeves (41) corresponding to the push rod (43) is fixed to the sliding rod (2) via a latch (61); the connecting plate (6) is movably sleeved on the cylinder (1); and a second limiting bar hole (12) for movably abutting against and limiting the latch (61) is provided on the cylinder (1).

8. The device for underwater removal and placement of core packing blocks during research reactor refueling as claimed in claim 1, characterized in that: The cylinder body (1) comprises an upper connecting cylinder (101), an extension cylinder (102) and a lower connecting cylinder which are connected in sequence, and the sliding rod (2) comprises an extension rod (201) and a lower connecting rod (202) which are connected in sequence.

9. The device for underwater removal and placement of core packing blocks during research reactor refueling as claimed in claim 1, characterized in that: The top of the cylinder (1) is threadedly and sealingly connected to a top cover (7), and the top cover (7) is movably connected to a lifting ring (8).

10. The device for underwater removal and placement of core packing blocks during research reactor refueling as claimed in claim 1, characterized in that: The outer wall of the cylinder (1) is provided with a camera for observing the taking and placing of the stuffing block (94).

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