Modularized nuclear reactor internals sleeve assembly tool and use method thereof

Abstract

The modular nuclear reactor internal sleeve assembling tool comprises a main support, the main support is provided with a main lifting lug, adjustable balance weight structures, a limiting plate and a supporting cross arm, the limiting plate and the supporting cross arm are matched with each other, the limiting plate is provided with a plurality of eccentric positioning pins, and the supporting cross arm is provided with a plurality of adjustable supporting structures. By adopting the structure, the traditional assembly process is changed, and the assembly time consumption is obviously reduced; the possibility that parts are scratched is reduced, and the assembly quality of the parts is guaranteed; and the assembly angle and the levelness of the sleeve are easier to fix, so that higher assembly positioning requirements are met.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear reactors, and in particular relates to a modular nuclear reactor internal component casing assembly tool and a use method thereof. Background Art

[0002] In the casing assembly of the internal components of modular small nuclear reactors, the casing is divided into two types according to the length: long straight tube and short straight tube. The SG (steam generator) nozzle is equipped with an elbow. After the annular cavity assembly is installed in the PRV (pressure vessel), the short straight tube is assembled with the annular cavity assembly, inserted into the PRV nozzle, and docked with the elbow. The single-side gap is very small during docking, so the stability, orientation and horizontality of the short casing during assembly are required to be high.

[0003] The traditional method is to first hoist a small roller frame into the inner platform of the cylinder, place an adjustable shim under the roller frame, and then hoist the short sleeve onto the roller frame. Then, by adjusting the adjustable shim and rotating the roller frame, align the assembly position, screw in the guide rod, and finally manually push the short sleeve along the guide rod to the assembly position. However, this method uses the guide rod to achieve assembly after alignment, which is easy to scratch the parts. When on the roller frame, the position of the short sleeve needs to be repeatedly adjusted to align with the assembly position. Due to the high requirements for the assembly position, adjustment is difficult, and pushing the short sleeve is time-consuming and laborious. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a modular nuclear reactor internal component casing assembly tool and a method of using the same, which changes the traditional assembly process and significantly reduces the assembly time; reduces the possibility of parts being scratched and ensures the quality of parts assembly; and makes it easier to fix the assembly angle and horizontality of the casing, thereby meeting higher assembly positioning requirements.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a modular nuclear reactor internal component casing assembly tool, including a main bracket, the main bracket is provided with a main lifting ear, an adjustable counterweight structure, a limit plate and a supporting cross arm that cooperate with each other, the limit plate is provided with a plurality of eccentric locating pins, and the supporting cross arm is provided with a plurality of groups of adjustable supporting structures. In a preferred embodiment, the adjustable counterweight structure includes a counterweight block, a positioning hole is provided at the bottom of the counterweight block, the positioning hole cooperates with a positioning rod arranged on the carrying frame, the carrying frame is fixedly connected to the main bracket, the top of the counterweight block cooperates with the fixing hole on the right-angle pull plate through a locking structure, the right-angle pull plate is provided with a first adjusting screw, the first adjusting screw cooperates with a first slide groove arranged on the main bracket, and the first adjusting screw is provided with a first positioning cap that cooperates with the main bracket for positioning.

[0006] In the preferred embodiment, the adjustable support structure includes multiple arc supports, a limiting groove is provided at the bottom of the arc support, the limiting groove cooperates with the limiting slide bar arranged on the supporting cross arm, a second adjusting screw is provided at the bottom of the arc support, the second adjusting screw cooperates with the second groove arranged on the supporting cross arm, and the second adjusting screw is provided with a second positioning cap which cooperates with the supporting cross arm for positioning.

[0007] In a preferred solution, auxiliary lifting ears are symmetrically provided on the main support.

[0008] In a preferred solution, the support cross arm is a reinforcing block connected to the main bracket.

[0009] In a preferred solution, the counterweight block is divided into an upper counterweight block and a lower counterweight block, and the upper counterweight block and the lower counterweight block are matched with each other through a stopper.

[0010] In a preferred solution, the limiting plate is connected to the main bracket by screws.

[0011] The present invention can achieve the following beneficial effects: (1) Changed the traditional assembly process and significantly reduced assembly time; (2) Reduce the possibility of parts being scratched and ensure the quality of parts assembly; (3) It is easier to fix the assembly angle and horizontality of the casing, thereby meeting higher assembly positioning requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Figure 1 It is a schematic diagram of the matching state of the long sleeve of the integral structure of the present invention; Figure 2 It is a schematic diagram of the matching state of the short sleeve of the integral structure of the present invention; Figure 3 It is a schematic diagram of the main support structure of the present invention; Figure 4 It is a schematic diagram of the main support structure of the present invention; Figure 5 It is a schematic diagram of the structure of the counterweight block of the present invention; In the figure: main bracket 1, counterweight block 2, positioning hole 3, locking structure 4, main lifting ear 5, auxiliary lifting ear 6, first slide groove 7, first adjusting screw 8, first positioning cap 9, fixing hole 10, limit plate 11, eccentric positioning pin 12, mounting frame 13, positioning rod 14, supporting cross arm 15, reinforcement block 16, second slide groove 17, limit slide bar 18, arc support 19, limit slide groove 20, second adjusting screw 21, second positioning cap 22, right-angle pull plate 23. DETAILED DESCRIPTION

[0013] Embodiment 1: like Figure 1-5 In the present invention, a modular nuclear reactor internal component casing assembly tool comprises a main bracket 1, on which a main lifting lug 5, an adjustable counterweight structure, a limiting plate 11 and a supporting cross arm 15 cooperating with each other are provided, the limiting plate 11 is provided with a plurality of eccentric positioning pins 12, and the supporting cross arm 15 is provided with a plurality of groups of adjustable supporting structures. In the preferred embodiment, the adjustable counterweight structure includes a counterweight block 2, a positioning hole 3 is provided at the bottom of the counterweight block 2, the positioning hole 3 cooperates with a positioning rod 14 arranged on a mounting frame 13, the mounting frame 13 is fixedly connected to the main bracket 1, and the top of the counterweight block 2 cooperates with the fixing hole 10 on the right-angle pull plate 23 through a locking structure 4, the right-angle pull plate 23 is provided with a first adjusting screw 8, the first adjusting screw 8 cooperates with a first slide groove 7 arranged on the main bracket 1, and the first adjusting screw 8 is provided with a first positioning cap 9 that cooperates with the main bracket 1 for positioning.

[0014] In the preferred embodiment, the adjustable support structure includes a plurality of arc supports 19, a limiting groove 20 is provided at the bottom of the arc support 19, the limiting groove 20 cooperates with the limiting slide bar 18 arranged on the support cross arm 15, a second adjusting screw 21 is provided at the bottom of the arc support 19, the second adjusting screw 21 cooperates with the second groove 17 arranged on the support cross arm 15, and a second positioning cap 22 is provided on the second adjusting screw 21 for positioning with the support cross arm 15.

[0015] In a preferred solution, auxiliary lifting ears 6 are symmetrically provided on the main support 1 .

[0016] In a preferred solution, the support cross arm 15 is connected to the reinforcing block 16 of the main bracket 1 .

[0017] In a preferred embodiment, the counterweight block 2 is divided into an upper counterweight block and a lower counterweight block, and the upper counterweight block and the lower counterweight block are matched with each other through a stopper.

[0018] In a preferred solution, the limiting plate 11 is connected to the main bracket 1 by screws.

[0019] Embodiment 2: like Figure 1-5 In the present invention, the method of use is: Step 1: After the arc support 19 is assembled with the main bracket 1, the arc support surface is processed and appropriately ground to ensure that the supporting sleeve is level; Step 2: Hang the counterweight 2, select the upper counterweight or the lower counterweight according to the length of the assembled sleeve, and initially fix it through the positioning hole 3 and the positioning rod 14. If the upper counterweight needs to be assembled, install the upper counterweight into the top stop of the lower counterweight, and then use the right-angle pull plate 23 to tighten it; Step 3: Assemble the limiting plate 11 to the main bracket 1; Step 4: Hang the sleeve onto the arc support 19, install the eccentric positioning pin 12 into the corresponding hole of the sleeve, and then assemble it with the limit plate 11; Step 5: Test-lift the tool and the casing, measure the level, and fine-tune the position of the counterweight 2 according to the level until the level meets the requirements; Step 6: Lift the tool and the casing into the annular cavity assembly, and after the assembly is completed with the elbow in the SG at the assembly position, assemble and fix the casing and the annular cavity assembly; Step 7: Loosen the connecting screws between the limit plate 11 and the main bracket 1 to remove the tool body, and then remove the limit plate 11 and the eccentric positioning pin 12.

[0020] The beneficial effects of the present invention are as follows: the traditional assembly process is changed, and the assembly time is significantly reduced; the sleeve is directly hoisted into the annular cavity assembly and assembled using tools, which can greatly reduce the possibility of parts being scratched and ensure the quality of parts assembly; the assembly orientation of the short sleeve is fixed by a limit plate and an eccentric locating pin, and the center of gravity is adjusted to ensure the assembly level by adjusting the position of the counterweight, which makes it easier to fix the assembly angle and horizontality of the sleeve, thereby meeting higher assembly positioning requirements.

[0021] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A modular nuclear reactor internals casing assembly tool, comprising a main support (1), characterized in that: The main support (1) is provided with a main lifting lug (5), an adjustable counterweight structure, a limiting plate (11) and a supporting cross arm (15) that cooperate with each other, the limiting plate (11) is provided with a plurality of eccentric positioning pins (12), and the supporting cross arm (15) is provided with a plurality of groups of adjustable supporting structures.

2. The modular nuclear reactor internals casing assembly tool according to claim 1, characterized in that: The adjustable counterweight structure comprises a counterweight block (2), a positioning hole (3) is provided at the bottom of the counterweight block (2), the positioning hole (3) cooperates with a positioning rod (14) arranged on a mounting frame (13), the mounting frame (13) is fixedly connected to the main support (1), the top of the counterweight block (2) cooperates with a fixing hole (10) on a right-angle pull plate (23) through a locking structure (4), the right-angle pull plate (23) is provided with a first adjusting screw (8), the first adjusting screw (8) cooperates with a first sliding groove (7) arranged on the main support (1), and the first adjusting screw (8) is provided with a first positioning cap (9) which cooperates with the main support (1) for positioning.

3. The modular nuclear reactor internals casing assembly tool according to claim 1, characterized in that: The adjustable support structure comprises a plurality of circular arc supports (19), a limiting slide groove (20) is provided at the bottom of the circular arc support (19), the limiting slide groove (20) cooperates with a limiting slide bar (18) provided on the support cross arm (15), a second adjusting screw (21) is provided at the bottom of the circular arc support (19), the second adjusting screw (21) cooperates with a second slide groove (17) provided on the support cross arm (15), and a second positioning cap (22) is provided on the second adjusting screw (21) for positioning with the support cross arm (15).

4. The modular nuclear reactor internals casing assembly tool according to claim 1, characterized in that: Auxiliary lifting ears (6) are symmetrically arranged on the main support (1).

5. The modular nuclear reactor internals casing assembly tool according to claim 1, characterized in that: The supporting cross arm (15) is connected to a reinforcing block (16) of the main support (1).

6. The modular nuclear reactor internals casing assembly tool according to claim 2, characterized in that: The counterweight block (2) is divided into an upper counterweight block and a lower counterweight block, and the upper counterweight block and the lower counterweight block are matched with each other via a stopper.

7. The modular nuclear reactor internals casing assembly tool according to claim 1, characterized in that: The limiting plate (11) is connected to the main bracket (1) via screws.

8. The method for using the modular nuclear reactor internals casing assembly tool according to any one of claims 1 to 7, characterized in that The following steps are involved: Step 1: After the arc support (19) is assembled with the main bracket (1), the arc support surface is processed and appropriately ground to ensure that the supporting sleeve is level; Step 2: Lift in the counterweight (2), select the upper counterweight or the lower counterweight according to the length of the assembled sleeve, and initially fix it through the positioning hole (3) and the positioning rod (14). If the upper counterweight needs to be assembled, install the upper counterweight into the top stop of the lower counterweight, and then tighten it with a right-angle pull plate (23); Step 3: Assemble the limit plate (11) to the main bracket (1); Step 4: Hang the sleeve onto the arc support (19), install the eccentric positioning pin (12) into the corresponding hole of the sleeve, and then assemble it with the limit plate (11); Step 5: Test-lift the tool and the casing, measure the level, and fine-tune the position of the counterweight (2) according to the level until the level meets the requirements; Step 6: Lift the tool and the casing into the annular cavity assembly, and after the assembly is completed with the elbow in the SG at the assembly position, assemble and fix the casing and the annular cavity assembly; Step 7: Loosen the connecting screws between the limit plate (11) and the main bracket (1), and then remove the tool body. Then remove the limit plate (11) and the eccentric positioning pin (12).

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