Lifting and overturning device for reactor flow distribution cover

Abstract

The utility model provides a lifting and turning device for a reactor flow distribution cover, and aims to improve the processing efficiency and precision, reduce the cost and protect a flange assembly surface. An upper lifting block and a lower lifting block are arranged on the inner spherical surface and the outer spherical surface of the flow distribution cover respectively and fixed through a center lifting rod and a nut to form lifting points, the upper lifting block and the lower lifting block are aligned to holes of a cover body, and two lifting points are designed in each group and are opposite in direction, so that lifting lugs are arranged on the inner spherical surface and the outer spherical surface respectively. The device is further integrated with a detail that the positioning sleeve penetrates through the hole and is fixed by the blind groove, and the base plate is installed on the non-contact face of the hanging block through a screw, so that stress distribution is optimized. By means of the design, the overturning auxiliary time in the machining process is effectively shortened, the transferring controllability is enhanced, interference on the flange assembling face is avoided, and therefore precise manufacturing and smooth delivery of nuclear reactor internals are guaranteed, and the overall manufacturing quality and efficiency are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power device manufacturing, in particular to a reactor flow distribution cover lifting and turning device. Background Art

[0002] The flow distribution cover is one of the key equipment of the main equipment of the nuclear island of the civil nuclear pressurized water reactor and an important component of the hanging basket assembly. It plays a key role in reasonably distributing the coolant flow and limiting the invalid leakage flow. The flow distribution cover is a semi-ellipsoidal thin-walled part, with hundreds of through holes with high precision requirements evenly distributed on the ellipsoidal surface; the top flange surface is used as the assembly interface surface, and the gap with the interface component surface is required to be no more than 0.04mm, which requires extremely high processing accuracy and is difficult to control deformation during processing and assembly.

[0003] The flow distribution cover is processed by alternately removing the excess from the inner and outer ellipsoidal surfaces (including the upper and lower flange surfaces). The workpiece needs to be turned over many times during the processing and trial assembly process. The key surface of the workpiece is easily deformed during the lifting and turning process. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide a reactor flow distribution cover lifting and flipping device, which effectively solves the problems existing in the prior art, realizes the repeated flipping operation during the processing of the flow distribution cover, and improves the processing quality of the flow distribution cover.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: a reactor flow distribution cover lifting and flipping device, comprising an upper hanging block and a lower hanging block, wherein the upper hanging block and the lower hanging block are respectively arranged on the inner and outer spherical surfaces of the flow distribution cover;

[0006] The upper hanging block and the lower hanging block are aligned with the holes on the flow distribution cover, and a lifting rod is passed through the middle of the upper hanging block and the lower hanging block. A lifting ear is provided at one end of the lifting rod, and the other end is fastened by a nut.

[0007] In a preferred solution, the upper hanging block and the lower hanging block are fixed by a lifting rod and a nut to form a hanging point on the flow distribution cover;

[0008] Four groups of lifting points are evenly distributed on the flow distribution cover. A single group of lifting points includes two lifting points. The lifting rods in the two lifting points are installed in opposite directions, so that the lifting ears at one end of the lifting rods in the two lifting points are respectively located on the inner spherical surface and the outer spherical surface of the flow distribution cover.

[0009] In a preferred solution, a positioning sleeve is provided in the upper hanging block and the lower hanging block, the positioning sleeve is set through the holes on the flow distribution cover, and the two ends of the positioning sleeve are fixed by blind grooves on one end of the upper hanging block and the lower hanging block.

[0010] In a preferred solution, the upper hanging block and the lower hanging block are both provided with a pad on one end away from the arc surface of the flow distribution cover, and the pad is fixed to the end surface of the upper hanging block and the lower hanging block by connecting screws.

[0011] The utility model provides a reactor flow distribution cover lifting and flipping device. Taking into account that the processing of the flow distribution cover needs to undergo multiple reciprocating flips to ensure processing accuracy, the flow distribution cover lifting and flipping device designed and manufactured successfully solves the processing risks caused by the long auxiliary transportation cycle and uncontrollable transportation process of the flow distribution cover during the processing, thereby improving the processing efficiency and saving costs. At the same time, the lifting and flipping of the device avoids the functional surface of the flange assembly of the flow distribution cover, which greatly reduces the influence of the lifting and flipping process of the flow distribution cover on the tolerance size of the flange assembly surface, ensures the processing accuracy of the product, and ensures the manufacture and delivery of key products of the internal components of the civil nuclear reactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0014] Figure 2 It is a schematic diagram of the elevation structure of the utility model.

[0015] Figure 3 It is a schematic diagram of the top structure of the utility model.

[0016] Figure 4 For this utility model Figure 3 Schematic diagram of the AA section structure.

[0017] In the figure: lifting rod 1, pad 2, upper hanging block 3, lower hanging block 4, positioning sleeve 5, connecting screw 6, nut 7, flow distribution cover 8. DETAILED DESCRIPTION

[0018] Embodiment 1:

[0019] like Figure 1-4 A reactor flow distribution cover lifting and flipping device includes an upper hanging block 3 and a lower hanging block 4, wherein the upper hanging block 3 and the lower hanging block 4 are respectively arranged on the inner and outer spherical surfaces of the flow distribution cover 8;

[0020] The upper hanging block 3 and the lower hanging block 4 are aligned with the holes on the flow distribution cover 8, and a lifting rod 1 is passed through the middle of the upper hanging block 3 and the lower hanging block 4. One end of the lifting rod 1 is provided with a lifting ear, and the other end is fastened by a nut 7.

[0021] In the preferred solution, the upper hanging block 3 and the lower hanging block 4 are fixed by the lifting rod 1 and the nut 7 to form a hanging point on the flow distribution cover 8;

[0022] Four groups of lifting points are evenly distributed on the flow distribution cover 8, and a single group of lifting points includes two lifting points. The lifting rods 1 in the two lifting points are installed in opposite directions, so that the lifting ears at one end of the lifting rods 1 in the two lifting points are respectively located on the inner spherical surface and the outer spherical surface of the flow distribution cover 8.

[0023] In the preferred solution, a positioning sleeve 5 is provided in the upper hanging block 3 and the lower hanging block 4. The positioning sleeve 5 passes through the holes on the flow distribution cover 8, and the two ends of the positioning sleeve 5 are fixed by blind grooves on one end of the upper hanging block 3 and the lower hanging block 4.

[0024] In a preferred solution, the upper hanging block 3 and the lower hanging block 4 are both provided with a pad 2 on one end away from the arc surface of the flow distribution cover 8, and the pad 2 is fixed to the end surfaces of the upper hanging block 3 and the lower hanging block 4 by connecting screws 6.

[0025] Embodiment 2:

[0026] Based on the reactor flow distribution cover lifting and flipping device structure described in Example 1, when it is necessary to lift the flow distribution cover with the flange facing upward:

[0027] When in use, the flange of the flow distribution cover 8 faces upwards, and the workpiece is raised to at least reserve operating space for the outer hanging points. First, install the four evenly distributed hanging points on the inner spherical surface of the flow distribution cover 8. The installation of the hanging points is performed as follows:

[0028] A. Install the two pads 2 separately with the upper hanging block 3 and the lower hanging block 4 and fasten them with connecting screws 6 (hexagon socket countersunk screws);

[0029] B. Install the positioning sleeve 5 of matching size in the hole of the processed flow distribution cover 8, and insert the two ends into the matching blind grooves of the upper hanging block 3 and the lower hanging block 4 respectively;

[0030] C. Adjust the upper hanging block 3 and the lower hanging block 4 to maximize the fitting area between the hanging block and the inner and outer spherical surfaces of the flow distribution cover 8, and confirm that the upper hanging block 3, the lower hanging block 4 and the positioning sleeve 5 are coaxial;

[0031] D. With the lifting ear at one end of the lifting rod 1 facing upwards, insert it into the installed positioning sleeve 5 from the upper inner side. The step surface of the lifting rod 1 is pressed against the pad 2. Install the M30 nut 7 on the exposed end of the lifting rod 1 thread outside the lower hanging block 4. Tighten the nut 7 and check that the installation state of the lifting point is stable.

[0032] E. Install the other three hanging points on the inner spherical surface according to steps A to D.

[0033] This installation state can be used for lifting with the flow distribution cover flange facing upward.

[0034] Embodiment 3:

[0035] Based on the reactor flow distribution cover lifting and flipping device structure described in Example 1, when the flow distribution cover needs to be flipped and the flow distribution cover flange faces downward:

[0036] Before the flow distribution cover 8 is turned over, four evenly distributed hanging points on the outer spherical surface need to be installed. The installation of the hanging points is performed as follows:

[0037] A. Install the two pads 2 with the upper and lower hanging blocks 4 respectively and fasten them with connecting screws 6 (hexagon socket countersunk screws);

[0038] B. Install the positioning sleeve 5 of matching size in the hole of the processed flow distribution cover 8, and insert the two ends into the matching blind grooves of the upper hanging block 3 and the lower hanging block 4 respectively;

[0039] C. Adjust the upper and lower hanging blocks 2 to maximize the fitting area between the hanging blocks 2 and the inner and outer spherical surfaces of the flow distribution cover, and confirm that the upper and lower hanging blocks 2 and the positioning sleeve are coaxial;

[0040] D. With the lifting ear of the lifting rod 1 facing downward, insert it into the installed positioning sleeve 5 from the upper inner side. The step surface of the lifting rod 1 is pressed against the pad 2. Install the M30 nut 7 on the exposed end of the lifting rod 1 outside the upper hanging block 3. Tighten the nut 7 and check that the installation state of the monomer is stable.

[0041] E. Install the other three hanging points on the inner spherical surface according to steps A to D.

[0042] After installation is completed, this state can be used to flip the flow distribution cover and lift the flow distribution cover when the flange faces downward.

[0043] Embodiment 4:

[0044] The flow distribution cover 8 is flipped in a way of somersault, and the following steps are performed when the device is flipped:

[0045] A. Use two lifting hooks to use the four lifting rods 1 on the spherical surface of one side of the flow distribution cover 8 to lift the flow distribution cover 8 horizontally to a certain height;

[0046] B. The hook on the a side remains unchanged, the hook on the b side slowly moves downward, and the flow distribution cover 8 is flipped to a vertical state;

[0047] C. Unfasten the lifting ring and lifting strap on the lower side b, rotate the workpiece 180 degrees, install the lifting ring and lifting strap on the lifting rod on the opposite spherical surface above the flow distribution cover, adjust the force of the hook on the side b, and after the workpiece is stable, unfasten the lifting ring and lifting strap on the side a;

[0048] D. The hook on the b side remains unchanged, and the hook on the a side slowly rises to a horizontal state, completing a flip.

Claims

1. A reactor flow distribution cover lifting and flipping device, characterized in that: It comprises an upper hanging block (3) and a lower hanging block (4), wherein the upper hanging block (3) and the lower hanging block (4) are respectively arranged on the inner and outer spherical surfaces of the flow distribution cover (8); The upper hanging block (3) and the lower hanging block (4) are arranged to align with the holes on the flow distribution cover (8), and a lifting rod (1) is passed through the middle of the upper hanging block (3) and the lower hanging block (4). A lifting ear is provided at one end of the lifting rod (1), and the other end is fastened by a nut (7).

2. A reactor flow distribution cover lifting and flipping device according to claim 1, characterized in that: The upper hanging block (3) and the lower hanging block (4) are fixed by means of a lifting rod (1) and a nut (7) to form a hanging point on the flow distribution cover (8); Four groups of lifting points are evenly distributed on the flow distribution cover (8), and each group of lifting points includes two lifting points. The lifting rods (1) in the two lifting points are installed in opposite directions, so that the lifting ears at one end of the lifting rods (1) in the two lifting points are respectively located on the inner spherical surface and the outer spherical surface of the flow distribution cover (8).

3. The reactor flow distribution cover lifting and flipping device according to claim 1, characterized in that: A positioning sleeve (5) is provided in the upper hanging block (3) and the lower hanging block (4). The positioning sleeve (5) is arranged through the holes on the flow distribution cover (8), and the two ends of the positioning sleeve (5) are fixed by blind grooves on one end of the upper hanging block (3) and the lower hanging block (4).

4. The reactor flow distribution cover lifting and flipping device according to claim 1, characterized in that: The upper hanging block (3) and the lower hanging block (4) are both provided with a pad (2) at one end away from the arc surface of the flow distribution cover (8), and the pad (2) is fixed to the end surfaces of the upper hanging block (3) and the lower hanging block (4) by connecting screws (6).

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