Nuclear power plant reactor vessel guide tube pad installation device

Abstract

The application discloses a kind of nuclear power plant reactor guide cylinder cushion block mounting device, including lifting head mechanism, for installing the inner rod mechanism of cushion block, for the pre-tightening of cushion block installation bolt Multiple pre-tightening rod mechanism and for the locking of pre-tightening rod mechanism Limiting pre-tightening rod top mechanism is sleeved in the circumferential side of inner rod mechanism;Inner rod mechanism includes cushion block installation positioning assembly, rotating assembly and connecting assembly, one end of connecting assembly is connected with rotating assembly, the other end is connected with cushion block installation positioning assembly, rotating assembly is set on lifting head mechanism, and can be moved back and forth between a first position and a second position, to drive cushion block installation positioning assembly Loosen or clamp cushion block;Multiple pre-tightening rod mechanism is set on the circumferential side of inner rod mechanism by pre-tightening rod top mechanism.The present application realizes the positioning, installation and pre-tightening of cushion block in high radioactive environment underwater long distance.

Description

Technical Field

[0001] This invention relates to the field of on-site maintenance technology for nuclear power plants, and in particular to a device for installing reactor guide tube pads in nuclear power plants. Background Technology

[0002] After long-term operation, the upper guide tube of a nuclear power plant reactor experiences wear. Excessive wear can lead to damage and potentially affect the normal operation of the reactor. Therefore, mitigation and repair work is necessary. One method is to install pads on the guide tube. However, the guide tube is located at a remote underwater location in a highly radioactive environment, making it difficult to install the pads using conventional equipment. Therefore, there is an urgent need for a tool that can install pads remotely underwater in a highly radioactive environment. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a device for installing a guide tube pad block for a nuclear power plant reactor.

[0004] The technical solution adopted by the present invention to solve its technical problem is: a nuclear power plant reactor guide tube pad block installation device is provided, including a lifting head mechanism, an inner rod mechanism for installing the pad block, a plurality of pre-tightening rod mechanisms for pre-tightening the pad block installation bolts, and a pre-tightening rod top mechanism for locking and limiting the pre-tightening rod mechanism, wherein the pre-tightening rod top mechanism is sleeved on the periphery of the inner rod mechanism;

[0005] The inner rod mechanism includes a pad mounting and positioning component, a rotating component, and a connecting component. One end of the connecting component is connected to the rotating component, and the other end is connected to the pad mounting and positioning component. The rotating component is mounted on the lifting head mechanism and can move back and forth between a first position and a second position to drive the pad mounting and positioning component to loosen or clamp the pad.

[0006] Multiple pretensioning rod mechanisms are disposed on the periphery of the inner rod mechanism via the pretensioning rod top mechanism.

[0007] In some embodiments, the pad mounting and positioning assembly includes a rotating connector, a rotating member, a connecting base, a clamping structure, and a bottom guide. The rotating member includes a first end facing the connecting assembly. The connecting base is connected to the top of the bottom guide. One end of the rotating connector passes through the connecting base and is connected to the connecting assembly. The rotating member is connected to the other end of the rotating connector and is disposed on the connecting base. The first end is hinged to the clamping structure. Rotation of the rotating connector can drive the clamping structure to move back and forth on the connecting base to loosen or clamp the pad.

[0008] In some embodiments, the connecting base is provided with a sliding groove on the side facing the connecting assembly, and the clamping structure includes two connecting rods and two clamping blocks hinged to the corresponding connecting rods. The two connecting rods are hinged to the first end, and the two clamping blocks are arranged opposite to each other. The side of the clamping blocks facing away from the connecting assembly is provided with a sliding portion adapted to the sliding groove.

[0009] In some embodiments, the pad mounting and positioning assembly further includes a connecting plate, a connector, and a plurality of pretensioning rod limiting cylinders. The connecting plate is connected to the connecting base through the connector, and the plurality of pretensioning rod limiting cylinders are mounted on the connecting plate at intervals around the axis of the connecting plate.

[0010] In some embodiments, a washer is provided inside the pretensioning rod limiting cylinder, and the washer is located at the bottom of the pretensioning rod limiting cylinder.

[0011] In some embodiments, at least two of the pretensioning rod limiting cylinders have limiting plates, which are disposed at the bottom of the pretensioning rod limiting cylinders and are correspondingly disposed with respect to the clamping structure.

[0012] In some embodiments, the rotating assembly includes a handle and a lifting rod, the handle being connected to one end of the lifting rod, the lifting rod being mounted on the lifting head mechanism, and the other end of the lifting rod being connected to the connecting assembly.

[0013] In some embodiments, the rotating assembly further includes a limiting pin, the lifting rod is provided with two first limiting blocks and a first limiting hole, and the lifting head mechanism is provided with two second limiting blocks and a second limiting hole. The first limiting blocks and the corresponding second limiting blocks are configured to define the rotation space between the first position and the second position.

[0014] The first limiting block is correspondingly provided with the second limiting hole, and the limiting pin is matched with the first limiting hole and the second limiting hole.

[0015] In some embodiments, the connecting assembly includes a plurality of inner rods and an inner rod connector, the plurality of inner rods being connected in sequence, and two adjacent inner rods being connected through the inner rod connector, and two inner rods located at both ends being connected to the rotating assembly and the pad mounting and positioning assembly, respectively.

[0016] In some embodiments, the nuclear power plant reactor guide tube pad installation device further includes a main connecting long rod assembly and an end connecting long rod assembly. The main connecting long rod assembly and the end connecting long rod assembly are connected in sequence and sleeved around the connecting assembly. One end of the main connecting long rod assembly is connected to the lifting head mechanism, and the other end is connected to one end of the end connecting long rod assembly. The other end of the end connecting long rod assembly is connected to the pad installation positioning assembly.

[0017] In some embodiments, the main connecting rod assembly includes a main connecting rod, a first tightening male head, a first nut bushing base, a first female head nut bushing, and a first tightening female head nut. The first tightening male head is disposed at one end of the main connecting rod, the first nut bushing base is disposed at the other end of the main connecting rod, one end of the first female head nut bushing is connected to the first nut bushing base, and the other end is connected to the first tightening female head nut.

[0018] In some embodiments, threaded connectors are provided at both ends of the main connecting rod, and the first tightening male head and the first nut bushing base are respectively fixed to the main connecting rod by the corresponding threaded connectors.

[0019] In some embodiments, the end connecting rod assembly includes a second tightening male, an end connecting component, and an intermediate connecting tube assembly. The second tightening male is disposed at one end of the intermediate connecting tube assembly and connected to the main connecting rod assembly. The end connecting component is disposed at the other end of the intermediate connecting tube assembly and connected to the pad mounting and positioning assembly.

[0020] In some embodiments, the intermediate connecting tube assembly includes a reinforcing sleeve and an intermediate connecting tube sleeved around the reinforcing sleeve, with a portion of the reinforcing sleeve exposed outside the intermediate connecting tube, and the exposed portions of the intermediate connecting tube and the reinforcing sleeve connected to the second tightening male connector.

[0021] In some embodiments, the lifting mechanism includes a lifting head, a support body, a connecting cylinder, a second nut bushing base, a second female nut bushing, and a second tightening nut. One end of the lifting head is connected to the support body, and the other end of the support body is connected to one end of the connecting cylinder. The rotating component is mounted on the support body and partially located within the support body. The second nut bushing base is disposed around the connecting cylinder. The second female nut bushing is disposed between the connecting cylinder and the second nut bushing base. The second tightening nut is installed at the end of the second female nut bushing away from the second nut bushing base, and there is a gap between the inner wall of the second tightening nut and the outer wall of the second female nut bushing. The second tightening nut is connected to the main connecting rod assembly.

[0022] In some embodiments, the lifting mechanism further includes an upper sleeve, a lower sleeve, and a sliding bearing. The upper sleeve is installed at the top inside the support body, the lower sleeve is installed at the bottom inside the support body, and the sliding bearing is installed between the upper sleeve and the lower sleeve.

[0023] In some embodiments, the pretensioning rod mechanism includes a pretensioning screw head, a pretensioning head, a plurality of pretensioning rods, a connector, and a limiting ring. The plurality of pretensioning rods are connected in sequence, and two adjacent pretensioning rods are connected by the connector. The two pretensioning rods located at both ends are respectively equipped with the pretensioning screw head and the pretensioning head, and the pretensioning rod equipped with the pretensioning screw head is provided with the limiting ring.

[0024] In some embodiments, the pretensioning rod top mechanism includes a top base, a limiting sleeve, a first locking sleeve, and a locking member for locking the pretensioning rod mechanism and the limiting sleeve. The limiting sleeve has a locking hole, the top base has a first through hole and a plurality of second through holes disposed around the first through hole, the first locking sleeve is disposed in the first through hole, the limiting sleeve is disposed in the corresponding second through hole, the first locking sleeve is mounted on the main connecting long rod assembly, the pretensioning rod mechanism passes through the limiting sleeve, and the locking member locks the pretensioning rod mechanism through the locking hole.

[0025] In some embodiments, the nuclear power plant reactor guide tube pad installation device further includes a plurality of pre-tightening rod intermediate assemblies, which are disposed on the corresponding main connecting long rod assembly.

[0026] In some embodiments, the pretensioning rod intermediate assembly includes an intermediate base and a second locking sleeve. The intermediate base has a third through hole and a plurality of fourth through holes disposed around the third through hole. The second locking sleeve is disposed on the third through hole and is mounted on the main connecting long rod assembly. The pretensioning rod mechanism passes through the fourth through holes.

[0027] The present invention offers the following advantages: By moving the rotating assembly to the second position, the pad mounting and positioning assembly clamps the pad. The inner rod mechanism is hoisted onto the lifting tool via the lifting head mechanism and locked by the pre-tightening rod top mechanism. The lifting tool is lowered to allow the pad mounting assembly to enter the guide cylinder. The inner rod mechanism is adjusted to place the pad onto the guide cylinder, aligning the pad mounting bolts with the bolt holes above the guide cylinder. The locking of the pre-tightening rod mechanism is released, and the pre-tightening rod mechanism is used to pre-tighten the pad mounting bolts. By moving the rotating assembly to the first position, the pad mounting and positioning assembly releases the pad, and then the pre-tightening rod top mechanism locks the pre-tightening rod mechanism. The pad is then lifted out by the lifting tool and mounted on a dedicated hanger. This invention enables convenient long-distance installation of the pad in highly radioactive underwater environments, pre-tightening of the pad mounting bolts, and convenient removal of the pad after installation. Attached Figure Description

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0029] Figure 1 This is a schematic diagram of the structure of the nuclear power plant reactor guide tube pad block installation device provided by the present invention;

[0030] Figure 2 This is a schematic diagram of the structure of the pad provided by the present invention;

[0031] Figure 3 This is a schematic diagram of the lifting mechanism provided by the present invention;

[0032] Figure 4 This invention follows Figure 3 A cross-sectional view along the AA direction;

[0033] Figure 5 This is a top view of the lifting mechanism and rotating assembly provided by the present invention.

[0034] Figure 6 This is a schematic diagram of the main connecting rod assembly provided by the present invention;

[0035] Figure 7 This is a partial schematic diagram of the main connecting rod provided by the present invention;

[0036] Figure 8 This is a schematic diagram of the end-connecting long rod assembly provided by the present invention;

[0037] Figure 9 This is a cross-sectional view of the intermediate connecting pipe assembly provided by the present invention;

[0038] Figure 10 This is a schematic diagram of the structure of the end connection component provided by the present invention;

[0039] Figure 11 This is a schematic diagram of the pretensioning rod mechanism provided by the present invention;

[0040] Figure 12 This is a schematic diagram of the pretensioning rod top mechanism provided by the present invention;

[0041] Figure 13 This is a schematic diagram of the structure of the pretensioner rod intermediate assembly provided by the present invention;

[0042] Figure 14 This is a schematic diagram of the internal rod mechanism provided by the present invention;

[0043] Figure 15 This is a schematic diagram of the rotating assembly provided by the present invention;

[0044] Figure 16 This is a schematic diagram of the structure of the pad mounting and positioning assembly provided by the present invention;

[0045] Figure 17 This invention follows Figure 16 A cross-sectional view along the BB direction;

[0046] Figure 18 This is a schematic diagram showing the fit of the pad mounting and positioning assembly, the pad, and the pad mounting bolts provided by the present invention;

[0047] Figure 19 This invention follows Figure 18 A cross-sectional view along the CC direction.

[0048] Figure label:

[0049] Nuclear power plant reactor guide tube pad installation device-1;

[0050] Lifting head mechanism - 11; Lifting head - 111; Support body - 112; Connecting cylinder - 113; Tightening nut - 114; Second nut bushing base - 1141; Second nut bushing - 1142; Second tightening nut - 1143; Upper sleeve - 115; First annular structure - 1151; Lower sleeve - 116; Second annular structure - 1161; Sliding bearing - 117; Second limiting block - 118;

[0051] Inner rod mechanism - 12; Pad mounting and positioning assembly - 121; Rotary connector - 1211; Rotary rod - 12111; Rotary seat - 12112; Rotary component - 1212; Connecting base - 1213; Clamping structure - 1214; Connecting rod - 12141; Clamping block - 12142; Sliding part - 12143; Bottom guide - 1215; Connecting disc - 1216; Main body - 12161; Branch part - 12162; Connector-1217; Pre-tightening rod limiting cylinder-1218; Step structure-12181; Washer-12182; Limiting plate-12183; Rotating assembly-122; Handle-1221; Lifting rod-1222; First limiting block-12221; First limiting hole-12222; Limiting pin-1223; Connecting assembly-123; At least one inner rod-1231; Inner rod-12311; Inner rod connector-12312;

[0052] Pretensioning rod mechanism - 13; Pretensioning screw head - 131; Pretensioning head - 132; At least one pretensioning rod - 133; Connector - 1331; Top pretensioning rod - 1332; Middle pretensioning rod - 1333; Tail pretensioning rod - 1334; Limiting ring - 134;

[0053] Pre-tightening rod top mechanism-14; top base-141; limiting sleeve-142; locking hole-1421; first locking sleeve-143;

[0054] Main connecting rod assembly - 15; Main connecting rod - 151; Mounting nut - 1511; First tightening male head - 152; First nut bushing base - 153; First female head nut bushing - 154; First tightening female head nut - 155;

[0055] End connecting rod assembly - 16; Second tightening male head - 161; End connecting component - 162; Mounting hole - 1621; Intermediate connecting tube assembly - 163; Reinforcing sleeve - 1631; Intermediate connecting tube - 1632;

[0056] Preload rod intermediate assembly - 17; intermediate base - 171; second locking sleeve - 172; fourth through hole - 173;

[0057] Spacer block -2;

[0058] Base - 21; Support - 22; Top - 23; Clamping Space - 24; Bolt Hole - 25;

[0059] Spacer mounting bolts - 3. Detailed Implementation

[0060] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0061] Please see Figure 1 , Figure 18 and Figure 19 The present invention provides a nuclear power plant reactor guide tube pad installation device 1, including a lifting head mechanism 11, an inner rod mechanism 12 for installing pad 2, a plurality of pre-tightening rod mechanisms 13 for pre-tightening the pad mounting bolts 3, and a pre-tightening rod top mechanism 14 for locking and limiting the pre-tightening rod mechanism 13.

[0062] Understandably, the guide tube is located at a distant underwater position in a highly radioactive environment. In order to facilitate the underwater operation of the nuclear power plant reactor guide tube pad installation device 1, pads 2 are added to the guide tube. In this embodiment, the lifting mechanism 11 is used to cooperate with lifting tools, such as crane equipment or other types of lifting tools, to realize the lifting operation of the entire nuclear power plant reactor guide tube pad installation device 1. The operation process saves manpower and is safe and reliable.

[0063] One end of the inner rod mechanism 12 is connected to the lifting head mechanism 11. The pre-tightening rod top mechanism 14 is sleeved around the inner rod mechanism 12. Multiple pre-tightening rod mechanisms 13 pass through the pre-tightening rod top mechanism 14 and are arranged around the inner rod mechanism 12 through the pre-tightening rod top mechanism 14. It can be understood that the other end of the inner rod mechanism 12 passes through the pre-tightening rod top mechanism 14, and multiple pre-tightening rod mechanisms 13 pass through the pre-tightening rod top mechanism 14, presenting a layout where the inner rod mechanism 12 is in the middle, and multiple pre-tightening rod mechanisms 13 surround the inner rod mechanism 12. In this embodiment, the pre-tightening rod top mechanism 14 not only locks and limits the pre-tightening rod mechanisms 13, but also connects the inner rod mechanism 12 and the pre-tightening rod mechanisms 13, ensuring that both can synchronously penetrate into the guide cylinder to achieve the installation of the pad 2 and the pre-tightening of the pad mounting bolts 3.

[0064] See also Figure 14The inner rod mechanism 12 includes a pad mounting and positioning assembly 121, a rotating assembly 122, and a connecting assembly 123. The rotating assembly 122 is mounted on the lifting head mechanism 11. One end of the connecting assembly 123 is connected to the rotating assembly 122, and the other end is connected to the pad mounting and positioning assembly 121. The rotating assembly 122 can move back and forth between a first position and a second position. Through the transmission of the connecting assembly 123, the pad mounting and positioning assembly 121 is driven to loosen or clamp the pad 2. When the rotating assembly 122 is in the first position, the pad mounting and positioning assembly 121 is in a loose state, which facilitates the installation of the pad 2 on the pad mounting and positioning assembly 121 or the loosening of the pad 2 on the pad mounting and positioning assembly 121. When the rotating assembly 122 is in the second position, the pad mounting and positioning assembly 121 is in a clamped state, which facilitates the clamping of the pad 2 installed on the pad mounting and positioning assembly 121, thereby realizing the installation of the pad 2. In this embodiment, multiple pre-tightening rod mechanisms 13 extend through the pre-tightening rod top mechanism 14 into the pad mounting and positioning assembly 121 to pre-tighten the pad mounting bolts 3 placed in the pad mounting and positioning assembly 121, thereby enabling convenient installation of the pad 2 at a distance underwater in a highly radioactive environment and pre-tightening of the pad mounting bolts 3, and convenient removal of the pad 2 after installation.

[0065] See also Figure 2 It should be noted that the pad 2 includes a base 21, a support 22, and a top 23. It should be noted that, in order to match the guide cylinder and for installation needs, the base 21 in this embodiment is a circular base, the top 23 is a frustum shape, and there are 4 support 22s as an example. Of course, in some other embodiments, the shape of the base 21 can also be square or polygonal, the top 23 can also be cylindrical or square, and the number of support 22s can also be adjusted as needed. It is not particularly limited here.

[0066] Four support seats 22 are arranged at equal angular intervals around the axis of the base 21. The support seats 22 serve to connect the base 21 and the top seat 23, and a clamping space 24 is formed between two adjacent support seats 22 for the pad mounting positioning assembly 121 to clamp or release them. Multiple bolt holes 25 are provided on the base 21 for the installation of pad mounting bolts 3. The base 21 and the top seat 23 are provided with coaxial through holes to facilitate placement on the pad mounting positioning assembly 121.

[0067] Understandably, in some embodiments, the pre-tightening rod mechanism 13 can also be a single unit. However, this requires readjusting and re-tightening the other unit after each pre-tightening of one pad mounting bolt 3, and it can easily bring out highly radioactive water, leading to a complex process. Similarly, two or three units can also be used. Preferably, there are four pre-tightening rod mechanisms 13, distributed around the periphery of the inner rod mechanism 12, which can pre-tighten the pad mounting bolts 3 all at once.

[0068] The pretensioning rod top mechanism 14 is sleeved around the inner rod mechanism 12. Understandably, to achieve a fixing function and prevent movement that could reduce accuracy, the pretensioning rod top mechanism 14 can be directly or indirectly fixed to the inner rod mechanism 12. That is, the connecting assembly 123 can be provided with mounting parts for fixing the pretensioning rod top mechanism 14 at corresponding positions, thus fixing the pretensioning rod top mechanism 14 without interfering with the rotation of the connecting assembly 123. In practical applications, to better fix the pretensioning rod top mechanism 14, the nuclear power plant reactor guide tube pad block installation device 1 also includes a main connecting long rod assembly 15. The main connecting long rod assembly 15 is sleeved around the connecting assembly 123, with one end connected to the lifting head mechanism 11 and the other end connected to the pad block installation and positioning assembly 121. The pretensioning rod top mechanism 14 is fixed to the periphery of the main connecting long rod assembly 15.

[0069] Due to the high operating height, and for ease of on-site use, the nuclear power plant reactor guide tube pad installation device 1 is designed as a multi-segment device. That is, in some embodiments, the nuclear power plant reactor guide tube pad installation device 1 also includes a main connecting long rod assembly 15 and an end connecting long rod assembly 16. Multiple main connecting long rod assemblies 15 are connected in sequence and sleeved around the connecting assembly 123. One end of the main connecting long rod assembly 15 is connected to the lifting head mechanism 11, and the other end is connected to one end of the end connecting long rod assembly 16. The pre-tightening rod top mechanism 14 is fixed around the main connecting long rod assembly 15, and the other end of the end connecting long rod assembly 16 is connected to the pad installation positioning assembly 121 and sleeved around the connecting assembly 123.

[0070] Preferably, in this embodiment, the outer rod is composed of three main connecting rod assemblies 15 and one end connecting rod assembly 16, and the two are connected by a threaded male and female joint for easy disassembly and assembly. The inner rod mechanism 12 is connected to the outer rod by bolts.

[0071] See also Figure 3 In some embodiments, the lifting mechanism 11 includes a lifting head 111, a support body 112, a connecting cylinder 113, and a tightening nut 114. The lifting head 111 is U-shaped and is welded to the top of the support body 112 to facilitate cooperation with lifting tools and to achieve the lifting operation of the entire nuclear power plant reactor guide tube pad block installation device 1. The bottom end of the support body 112 is connected to the connecting cylinder 113 by threads. The rotating component 122 is installed on the support body 112 and is partially located inside the support body 112. The rotating component 122 can rotate inside the support body 112. The tightening nut 114 is installed at the other end of the connecting cylinder 113 and is used to connect with the main connecting long rod assembly 15.

[0072] See also Figure 4The tightening head 114 includes a second nut bushing base 1141, a second nut bushing 1142, and a second tightening nut 1143. The second nut bushing base 1141 is installed on the periphery of the connecting cylinder 113 and is used for limiting and fastening the second nut bushing 1142, and also for limiting the installation of the second tightening nut 1143. The second nut bushing 1142 is disposed between the connecting cylinder 113 and the second nut bushing base 1141. The base 1141 has a threaded hole, and the second female nut bushing 1142 and the connecting cylinder 113 have matching threaded holes for easy bolt fixing. The second tightening nut 1143 is installed at the end of the second female nut bushing 1142 away from the second nut bushing base 1141. The second tightening nut 1143 is connected to the main connecting long rod assembly 15. The second nut bushing base 1141 and the second female nut bushing 1142 are connected to the main connecting long rod assembly 15 by threads. There is a gap between the inner wall of the second tightening nut 1143 and the outer wall of the second female nut bushing 1142 to facilitate the up and down movement of the second tightening nut 1143 during assembly between the main connecting long rod assemblies 15.

[0073] In some embodiments, the lifting mechanism 11 further includes an upper sleeve 115, a lower sleeve 116, and a sliding bearing 117. The upper sleeve 115 is installed at the top inside the support body 112, and the lower sleeve 116 is installed at the bottom inside the support body 112. The end of the upper sleeve 115 away from the sliding bearing 117 has a protruding first annular structure 1151, and similarly, the end of the lower sleeve 116 away from the sliding bearing 117 has a protruding second annular structure 1161. Preferably, the upper sleeve 115 and the lower sleeve 116 are respectively connected to the support body 112 by welding. The sliding bearing 117 is installed between the upper sleeve 115 and the lower sleeve 116 to facilitate the rotation of the inner rod mechanism 12, while the upper sleeve 115 and the lower sleeve 116 limit the movement of the sliding bearing 117. In this embodiment, there are two sliding bearings 117, located below the upper sleeve 115 and above the lower sleeve 116, respectively. They are used to limit the inner rod mechanism 12, prevent large gaps from causing large shaking, and facilitate the smooth operation of the inner rod mechanism 12.

[0074] See also Figure 6In some embodiments, the main connecting rod assembly 15 includes a main connecting rod 151, a first tightening male head 152, a first nut bushing base 153, a first female head nut bushing 154, and a first tightening female head nut 155. The first tightening male head 152 is disposed at one end of the main connecting rod 151, and the first nut bushing base 153 is disposed at the other end of the main connecting rod 151. One end of the first female head nut bushing 154 is connected to the first nut bushing base 153, and the other end is connected to the first tightening female head nut 155. It is understood that the first female head nut bushing 154 is located between the first nut bushing base 153 and the main connecting rod 151.

[0075] In this embodiment, the second female nut bushing 1142 adopts a claw-type structure design, and the top of the first tightening male nut 152 also adopts a claw-type structure design. This is used for positioning and limiting the first tightening female nut 155 and the first tightening male nut 152 during installation, facilitating the installation between the two components. When the lifting mechanism 11 is connected to the main connecting rod assembly 15, the upper and lower claws cooperate to prevent slippage when tightening the nut. It is understood that the first female nut bushing 154 also adopts a claw-type structure design. When multiple main connecting rod assemblies 15 are connected to each other, the upper and lower claws cooperate to prevent slippage when tightening the nut.

[0076] It is understandable that the tightening female head 114 and the first tightening male head 152 adopt a claw-type structure, which can prevent the tightening male and female heads connecting the components from loosening during the operation of the nuclear power plant reactor guide tube pad block installation device 1.

[0077] It is understandable that the first nut bushing base 153, the first female nut bushing 154, and the first tightening female nut 155 together form the first tightening female. It should be noted that the connection method of using the first tightening female and the first tightening male nut 152 reduces the stress on the main connecting rod 151 itself.

[0078] Since the nuclear power plant reactor guide tube pad installation device 1 in this embodiment is composed of multiple main connecting rod assemblies 15, the main connecting rod assembly 15 adopts a lightweight design for easy on-site use. The main connecting rod 151 itself is made of carbon fiber material. To avoid excessive radial force on the carbon fiber tube, and to ensure reliable connection between the first tightening male head 152 and the main connecting rod 151, as well as the first tightening female head and the main connecting rod 151, mounting screws are embedded in the main connecting rod 151. That is, nuts 1511 (e.g., ...) are respectively provided at both ends of the main connecting rod 151. Figure 7 As shown), it is used to fix the first tightening male head 152 and the first tightening female head. In this embodiment, the first tightening male head 152 and the first nut bushing base 153 are respectively fixed to the main connecting rod 151 by corresponding screws.

[0079] See also Figure 8 In some embodiments, the end connecting rod assembly 16 includes a second tightening male 161, an end connecting component 162, and an intermediate connecting tube assembly 163. The second tightening male 161 is disposed at one end of the intermediate connecting tube assembly 163 and connected to the main connecting rod assembly 15. The end connecting component 162 is connected to the other end of the intermediate connecting tube assembly 163 by welding and is connected to the pad mounting and positioning assembly 121. The second tightening male 161 adopts a claw-type structure design. When the end connecting rod assembly 16 is connected to the main connecting rod assembly 15, the upper and lower claws cooperate to prevent slippage when tightening the nut.

[0080] See also Figure 9 In some embodiments, the intermediate connecting tube assembly 163 includes a reinforcing sleeve 1631 and an intermediate connecting tube 1632 sleeved around the reinforcing sleeve 1631. To ensure a secure connection between the second tightening male 161 and the intermediate connecting tube 1632, the reinforcing sleeve 1631 and the intermediate connecting tube 1632 are connected together by welding. It should be noted that the intermediate connecting tube 1632 is relatively thin and has a short thread. Therefore, in this embodiment, a portion of the reinforcing sleeve 1631 is exposed outside the intermediate connecting tube 1632 to lengthen the thread, making the connection more stable. The exposed portion facilitates positioning. During connection, the exposed portion of the reinforcing sleeve 1631, as an extended thread, first connects to the second tightening male 161, and then the intermediate connecting tube 1632 connects to the second tightening male 161.

[0081] See also Figure 10 The end connecting component 162 has multiple mounting holes 1621 for installation in conjunction with the pad mounting and positioning assembly 121.

[0082] See also Figure 11 In some embodiments, the pre-tightening rod mechanism 13 includes a pre-tightening screw head 131, a pre-tightening head 132, at least one pre-tightening rod 133, and a limiting ring 134. The pre-tightening screw head 131 and the pre-tightening head 132 are respectively connected to both ends of the at least one pre-tightening rod 133. In this embodiment, the pre-tightening screw head 131 and the pre-tightening head 132 are respectively welded to both ends of the at least one pre-tightening rod 133. To monitor the completion of the pre-tightening operation of the pad mounting bolt 3 and to prevent the weight of the at least one pre-tightening rod 133 from directly acting on the pad mounting bolt 3 after the pre-tightening operation is completed, a limiting ring 134 is provided on the at least one pre-tightening rod 133. Preferably, the limiting ring 134 is welded to the at least one pre-tightening rod 133, and the pre-tightening head 132 extends into the pad mounting positioning assembly 121. During operation, a special screw-tightening tool is used to screw the pre-tightening screw head 131, causing the pre-tightening head 132 located in the pad mounting positioning assembly 121 to rotate, thereby achieving the pre-tightening of the pad mounting bolt 3.

[0083] Due to the high operating height, for ease of on-site use, preferably, at least one pretensioning rod 133 includes multiple pretensioning rods and a connector 1331. The multiple pretensioning rods are connected sequentially, and adjacent pretensioning rods are connected by connectors 1331. Two pretensioning rods at both ends are respectively equipped with a pretensioning screw head 131 and a pretensioning head 132. A limit ring 134 is provided on the pretensioning rod equipped with the pretensioning screw head 131. In this embodiment, the multiple pretensioning rods include one top pretensioning rod 1332 at the top, two middle pretensioning rods 1333 in the middle, and one tail pretensioning rod 1334 at the tail. It can be understood that this embodiment uses four pretensioning rods for ease of use at higher operating heights. The pre-tightening screw head 131 is connected to the top pre-tightening rod 1332 by welding, and a limit ring 134 is welded onto the top pre-tightening rod 1332. One end of the top pre-tightening rod 1332, the intermediate pre-tightening rod 1333, and the tail pre-tightening rod 1334 is welded with a connector 1331 for connecting adjacent rods via a pin and cotter pin engagement. The pre-tightening head 132 and the tail pre-tightening rod 1334, connected by welding, are the actual execution ends for the pre-tightening operation.

[0084] See also Figure 12 In some embodiments, the pretensioning rod top mechanism 14 includes a top base 141, a limiting sleeve 142, a first locking sleeve 143, and a locking member for locking the pretensioning rod mechanism 13 and the limiting sleeve 142, thereby limiting the pretensioning rod mechanism 13. The top base 141 has a first through hole and a plurality of second through holes disposed around the first through hole. In this embodiment, the top base 141 has a cross-shaped structure, so there are four second through holes in this embodiment, with the first through hole located in the middle and the four second through holes located at the four ends of the cross-shaped top base 141. The limiting sleeve 142 is welded into the corresponding second through hole, and the first locking sleeve 143 is welded into the first through hole. The first locking sleeve 143 is mounted on the main connecting long rod assembly 15, and the pretensioning rod mechanism 13 passes through the limiting sleeve 142. A certain gap is left between the limiting sleeve 142 and the pre-tightening rod mechanism 13, which facilitates slight adjustment of the posture of the pre-tightening rod mechanism 13 during the pre-tightening operation of the pad mounting bolt 3.

[0085] The limiting sleeve 142 has a locking hole 1421, through which the locking element locks the pre-tightening rod mechanism 13. Before the pre-tightening operation, the pre-tightening rod mechanism 13 and the limiting sleeve 142 are locked and limited by the locking pin (i.e., the locking element). When the limiting ring 134 of the pre-tightening rod mechanism 13 comes into contact with the limiting sleeve 142, it means that the pre-tightening operation of the pad mounting bolt 3 is completed. At this time, the pre-tightening rod mechanism 13 and the limiting sleeve 142 can be locked and limited again by the locking pin to prevent the weight of the pre-tightening rod mechanism 13 from acting directly on the pad mounting bolt 3.

[0086] Understandably, the first locking sleeve 143 has holes for locking with the main connecting rod 151.

[0087] See also Figure 13 In some embodiments, the nuclear power plant reactor guide tube pad installation device 1 further includes a pretensioning rod intermediate assembly 17, which is disposed on the main connecting long rod assembly 15 and spaced apart from the pretensioning rod top mechanism 14, and is used for limiting the pretensioning rod mechanism 13.

[0088] Understandably, in some embodiments, there are multiple pretension bar intermediate assemblies 17. Preferably, multiple pretension bar intermediate assemblies 17 are disposed on corresponding main connecting long rod assemblies 15, that is, each main connecting long rod assembly 15 is provided with one pretension bar intermediate assembly 17.

[0089] See also Figure 14 In some embodiments, the pretensioning rod intermediate assembly 17 includes an intermediate base 171 and a second locking sleeve 172. The intermediate base 171 has a third through hole and a plurality of fourth through holes 173 disposed around the third through hole. In this embodiment, the intermediate base 171 has a cross-shaped structure, so there are four fourth through holes 173. The third through hole is located in the middle, and the four fourth through holes 173 are respectively located at the four ends of the cross-shaped intermediate base 171. The second locking sleeve 172 is welded onto the third through hole and is installed on the main connecting long rod assembly 15. The pretensioning rod mechanism 13 passes through the fourth through hole 173. The size of the fourth through hole 173 is slightly larger than the outer diameter of the pretensioning rod mechanism 13, which facilitates slight adjustments to the posture of the pretensioning rod mechanism 13 during the pretensioning operation of the pad mounting bolt 3.

[0090] Understandably, the second locking sleeve 172 has holes for locking with the main connecting rod 151. That is, the pretension rod top mechanism 14 and the pretension rod intermediate assembly 17 are connected to the main connecting rod assembly 15 or the end connecting rod assembly 16 by threads.

[0091] See also Figure 16 and Figure 17In some embodiments, the pad mounting and positioning assembly 121 includes a rotating connector 1211, a rotating component 1212, a connecting base 1213, a clamping structure 1214, and a bottom guide component 1215. The connecting base 1213 is connected to the top of the bottom guide component 1215. In this embodiment, the connecting base 1213 and the bottom guide component 1215 are connected together by welding. The bottom guide component 1215 has a cylindrical structure and is used for guiding and aligning with the center of the guide tube during the lowering process of the nuclear power plant reactor guide tube pad mounting device 1. The connecting base 1213 serves as a base and provides support. The connecting base 1213 has a through hole for one end of the rotating connector 1211 to pass through and connect with the connecting assembly 123.

[0092] In this embodiment, the rotating connector 1211 is an integral structure formed by welding a rotating rod 12111 and a rotating seat 12112 together. Its upper part passes through the through hole of the connecting base 1213 and is connected to the connecting assembly 123 via a cylindrical pin, while its lower part is connected to the rotating component 1212 via bolts. It can be understood that the rotating component 1212 is sleeved on the rotating rod 12111 and connected to the rotating seat 12112 via bolts. The rotating seat 12112 serves to fix the rotating component 1212, and the rotating rod 12111 passes through the through hole on the connecting base 1213 and is connected to the connecting assembly 123, thus serving a transmission function.

[0093] The rotating component 1212 includes a first end facing the connecting assembly 123 and a second end opposite to the first end. The width of the second end is greater than the diameter of the through hole of the connecting base 1213 to limit and fix it, preventing the rotating component 1212 and the rotating connector 1211 from disengaging. The rotating component 1212 is disposed on the connecting base 1213 and is exposed through the through hole of the connecting base 1213, so that the first end can be hinged to the clamping structure 1214. The rotation of the rotating connector 1211 can drive the rotating component 1212 to rotate, thereby driving the clamping structure 1214 to move back and forth on the connecting base 1213, realizing the loosening or clamping of the pad 2.

[0094] Understandably, the through-hole diameter of the base 21 and top seat 23 of pad 2 is larger than the width of the connecting base 1213, so that pad 2 can be placed on pad mounting and positioning assembly 121, and clamping structure 1214 is correspondingly set with clamping space 24 so that the pad 2 can be loosened or clamped by moving back and forth on connecting base 1213 through clamping mechanism.

[0095] In some embodiments, the connecting base 1213 has a groove on the side facing the connecting assembly 123. The clamping structure 1214 includes two connecting rods 12141 and two clamping blocks 12142 hinged to the corresponding connecting rods 12141. The two clamping blocks 12142 are arranged opposite to each other, and the two connecting rods 12141 are respectively hinged to corresponding positions at the first end. The side of the clamping block 12142 facing away from the connecting assembly 123 has a sliding part 12143 adapted to the groove, so that the sliding part 12143 can slide back and forth in the groove. It can be understood that the two clamping blocks 12142 are correspondingly arranged with the corresponding clamping space 24, and the rotating member 1212, the connecting rods 12141 and the clamping blocks 12142 are connected by bolts. When the rotating assembly 122 is rotated, the rotating member 1212 can be driven to rotate, which is then converted into the extension and retraction of the clamping blocks 12142, realizing the clamping and release of the pad 2.

[0096] In some embodiments, the pad mounting and positioning assembly 121 further includes a connecting plate 1216, a connecting member 1217, and a plurality of pre-tightening rod limiting cylinders 1218. The connecting plate 1216 is connected to the connecting base 1213 via the connecting member 1217. It is understood that, to facilitate the installation of the clamping structure 1214, the connecting member 1217 is composed of two opposing connecting plates, i.e., space is left between the two connecting plates for the clamping structure 1214 to move. Alternatively, the connecting member 1217 can also be a one-piece structure, i.e., space is provided on opposite sides at corresponding positions for the clamping structure 1214 to move. In this embodiment, the connecting base 1213, bottom guide 1215, connecting member 1217, connecting plate 1216, and pre-tightening rod limiting cylinders 1218 are connected together by welding. The connecting plate 1216 serves as a component supporting multiple pre-tightening rod limiting cylinders 1218. The multiple pre-tightening rod limiting cylinders 1218 are installed on the connecting plate 1216 at intervals around the axis of the connecting plate 1216, and multiple pre-tightening rod mechanisms 13 extend into the corresponding pre-tightening rod limiting cylinders 1218.

[0097] Specifically, the connecting plate 1216 includes a main body 12161 for connecting to the connector 1217 and a plurality of branches 12162 extending outward from the main body 12161. The plurality of branches 12162 are spaced apart around the axis of the main body 12161, and the plurality of branches 12162 and the main body 12161 are integrally formed. A plurality of pre-tightening rod limiting cylinders 1218 are respectively disposed on the corresponding branches 12162 for placing the pad mounting bolts 3 and for the corresponding pre-tightening rod mechanism 13 to extend into them to pre-tighten the pad mounting bolts 3.

[0098] It should be noted that a stepped structure 12181 is provided inside the pre-tightening rod limiting cylinder 1218, and this stepped structure 12181 is located near the bottom end of the pre-tightening rod limiting cylinder 1218. Understandably, when the pre-tightening rod mechanism 13 contacts the stepped structure 12181, it indicates that the pre-tightening operation of the pad mounting bolt 3 is completed, serving as a limit to restrict the swaying of the pre-tightening rod mechanism 13, increase the installation accuracy of the pad mounting bolt 3, and improve installation efficiency.

[0099] In this embodiment, the connecting plate 1216 is connected to the end connecting rod assembly 16 by bolts, thereby realizing the interconnection between the inner rod (i.e., the inner rod mechanism 12) and the outer rod (i.e., the main connecting rod assembly 15 and the end connecting rod assembly 16).

[0100] In some embodiments, a washer 12182 is provided inside the pretensioning rod limiting cylinder 1218, and the washer 12182 is located at the bottom of the pretensioning rod limiting cylinder 1218. In this embodiment, the washer 12182 is an O-ring. By also installing an O-ring in the pretensioning rod limiting cylinder 1218, it is used to fix the pad mounting bolt 3 during the lowering process, and it also facilitates the subsequent pretensioning operation of the pad mounting bolt 3.

[0101] In some embodiments, at least two pretension rod limiting cylinders 1218 have limiting plates 12183, which are disposed at the bottom of the pretension rod limiting cylinders 1218 and correspond to the clamping structure 1214. In this embodiment, the limiting plates 12183 are used to prevent the pad block 2 from undergoing large-scale rotational displacement during the lowering process. Preferably, the limiting plates 12183 are arc-shaped.

[0102] See also Figure 15 In some embodiments, the rotating assembly 122 includes a handle 1221 and a lifting rod 1222. The handle 1221 is connected to one end of the lifting rod 1222. In this embodiment, the handle 1221 and the lifting rod 1222 are connected together by welding. The lifting rod 1222 is mounted on the lifting head mechanism 11. The handle 1221 is exposed outside the lifting head mechanism 11. The other end of the lifting rod 1222 is connected to the connecting assembly 123. By rotating the handle 1221, the connecting assembly 123 is driven to rotate, thereby driving the rotating component 1212 to rotate, which is then converted into the extension and retraction of the clamping block 12142, which can realize the clamping and release of the pad block 2.

[0103] See also Figure 5 In some embodiments, the rotating assembly 122 further includes a limiting pin 1223 (e.g., Figure 1As shown, the lifting rod 1222 is provided with two first limiting blocks 12221 and a first limiting hole 12222, and the lifting head mechanism 11 is provided with two second limiting blocks 118 and a second limiting hole. The first limiting blocks 12221 and the corresponding second limiting blocks 118 are configured to define the rotation space between the first position and the second position. The first limiting blocks 12221 and the second limiting holes are configured to correspond, and the limiting pins 1223 are matched with the first limiting holes 12222 and the second limiting holes.

[0104] Understandably, in this embodiment, the lifting rod 1222 has first limiting blocks 12221 on both opposite sides to limit the rotational position of the handle 1221. The positions of the two limiting blocks represent the clamping completion state (i.e., when in the first position) and the release completion state (i.e., when in the second position) of the pad 2, respectively. The first annular structure 1151 of the upper sleeve 115 is welded with two second limiting blocks 118, with an included angle of 90° between the two second limiting blocks 118, to limit the rotational movement of the inner rod mechanism 12. The two limiting positions represent the clamping state of the pad 2 and the long rod tool removal state, respectively. The first limiting blocks 12221 and the second limiting blocks 118 are configured to cooperate. It can also be understood that during operation, the clamping state of the pad 2 corresponds to the clamping completion state, and the release completion state corresponds to the long rod tool removal state. There are four first limiting blocks 12221 on the lifting rod 1222, with a 90° interval between each pair. The support body 112 is provided with at least one corresponding second limiting hole. In this embodiment, two second limiting holes with a 180° interval are used. When the inner rod mechanism 12 rotates to the limited position, the inner rod mechanism 12 can be locked by the limiting pin 1223 to prevent the inner rod mechanism 12 from rotating and affecting the on-site operation.

[0105] It is understood that the rotation angle between the first position and the second position in this embodiment is 90°. In other embodiments, it can be adjusted as needed, and it is not limited here.

[0106] It is also understandable that the interval angle between the two first limiting blocks 12221 and the interval angle between the two second limiting blocks 118 can be adjusted as needed. For example, in some embodiments, the included angle between the two first limiting blocks 12221 is 90°, and the included angle between the two second limiting blocks 118 is also 90°. In this case, one first limiting block 12221 is located between the two second limiting blocks 118 and is in contact with one of the second limiting blocks 118, while the other first limiting block 12221 is located outside the two second limiting blocks 118. In other embodiments, the included angle between the two first limiting blocks 12221 is 180°, and the included angle between the two second limiting blocks 118 is 90°. These are not limited here, as long as the above rotation angle can be satisfied.

[0107] In some embodiments, the connecting assembly 123 includes at least one inner rod 1231, the two ends of which are respectively connected to the rotating assembly 122 and the pad mounting and positioning assembly 121. It is understood that the length of the connecting assembly 123 can be increased or decreased as needed, i.e., different lengths can be achieved by increasing or decreasing the number of connecting rods 12141.

[0108] Due to the high operating height, and for ease of on-site use, the nuclear power plant reactor guide tube pad block installation device 1 is designed as a multi-segment type. Specifically, at least one inner rod 1231 includes multiple inner rods 12311 and inner rod connectors 12312. These inner rods 12311 are connected sequentially, and adjacent inner rods 12311 are connected via inner rod connectors 12312. The two inner rods 12311 located at both ends are connected to the rotating assembly 122 and the pad block installation and positioning assembly 121, respectively. In this embodiment, there are four inner rods 12311: three inner rods and one tail inner rod. Both the inner rods and the tail inner rod have inner rod connectors 12312 welded to one end. Cylindrical pins are used to connect the inner rods to each other and to the tail inner rod. Similarly, the lifting rod 1222 is connected to the inner rod at one end via cylindrical pins, and the tail inner rod at the other end is connected to the rotating rod 12111 via cylindrical pins.

[0109] The specific work process is as follows:

[0110] Rotate the lifting rod 1222 to retract the clamping block 12142, then lock it with the limit pin 1223; place the pad mounting and positioning assembly 121 at the end of the inner rod mechanism 12 into the pad 2; rotate the lifting rod 1222 to extend the clamping block 12142, then lock it with the limit pin 1223; use the hoisting mechanism 11 to mount the nuclear power plant reactor guide tube pad mounting device 1 onto the hoisting tool; control the hoisting tool to descend, so that the bottom guide member 1215 of the pad mounting and positioning assembly 121 enters the guide tube. Adjust the position of the nuclear power plant reactor guide tube pad installation device 1, place the pad 2 on the guide tube, and align the pad installation bolt 3 with the bolt hole 25 above the guide tube; use a screwdriver to tighten the pre-tightening rod mechanism 13 to pre-tighten the pad installation bolt 3; rotate the lifting rod 1222 to put the pad 2 in a retracted state, and then lock it with the limit pin 1223; use a hoisting tool to lift the nuclear power plant reactor guide tube pad installation device 1 out and hang it on a special hanger to realize the long-distance positioning, installation and pre-tightening of the pad 2 in a high-radioactivity underwater environment.

[0111] In summary, the nuclear power plant reactor guide tube pad installation device 1 provided by this invention enables the long-distance positioning, installation, and pre-tightening of the nuclear power plant reactor guide tube pad 2 in a highly radioactive underwater environment. On one hand, the nuclear power plant reactor guide tube pad installation device 1 is based on a modular design, allowing for easy assembly and disassembly of each component; on the other hand, it is based on a lightweight design, using lightweight, high-performance materials for each component. This not only enables convenient alignment and installation of the pad 2 over long distances in a highly radioactive underwater environment, and facilitates easy removal of the pad 2 after installation, but also allows for the pre-tightening of the pad mounting bolts 3, facilitating subsequent operational procedures.

[0112] It is understood that the above embodiments only illustrate preferred embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can freely combine the above technical features without departing from the concept of the present invention, and can also make several modifications and improvements, all of which fall within the protection scope of the present invention. Therefore, all equivalent transformations and modifications made with respect to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A device for installing a guide tube pad block in a nuclear power plant reactor, characterized in that, It includes a lifting head mechanism, an inner rod mechanism for installing the pad block, multiple pre-tightening rod mechanisms for pre-tightening the pad block mounting bolts, and a pre-tightening rod top mechanism for locking and limiting the pre-tightening rod mechanism, wherein the pre-tightening rod top mechanism is sleeved around the inner rod mechanism; The inner rod mechanism includes a pad mounting and positioning component, a rotating component, and a connecting component. One end of the connecting component is connected to the rotating component, and the other end is connected to the pad mounting and positioning component. The rotating component is mounted on the lifting head mechanism and can move back and forth between a first position and a second position to drive the pad mounting and positioning component to loosen or clamp the pad. Multiple pretensioning rod mechanisms are disposed on the periphery of the inner rod mechanism via the pretensioning rod top mechanism; The pad mounting and positioning assembly includes a rotating connector, a rotating component, a connecting base, a clamping structure, and a bottom guide. The rotating component has a first end facing the connecting assembly. The connecting base is connected to the top of the bottom guide. One end of the rotating connector passes through the connecting base and is connected to the connecting assembly. The other end of the rotating component is connected to the connecting base and is disposed on the connecting base. The first end is hinged to the clamping structure. Rotation of the rotating connector can drive the clamping structure to move back and forth on the connecting base to loosen or clamp the pad. The pretensioning rod mechanism includes a pretensioning screw head, a pretensioning head, multiple pretensioning rods, a connector, and a limiting ring. The multiple pretensioning rods are connected in sequence, and adjacent pretensioning rods are connected by the connector. The two pretensioning rods at both ends are respectively equipped with the pretensioning screw head and the pretensioning head. The pretensioning rod equipped with the pretensioning screw head is provided with the limiting ring.

2. The nuclear power plant reactor guide tube pad installation device according to claim 1, characterized in that, The connecting base is provided with a sliding groove on the side facing the connecting assembly. The clamping structure includes two connecting rods and two clamping blocks hinged to the corresponding connecting rods. The two connecting rods are hinged to the first end, and the two clamping blocks are arranged opposite to each other. The side of the clamping block facing away from the connecting assembly is provided with a sliding part that matches the sliding groove.

3. The nuclear power plant reactor guide tube pad installation device according to claim 1, characterized in that, The pad mounting and positioning assembly also includes a connecting plate, a connector, and multiple pre-tightening rod limiting cylinders. The connecting plate is connected to the connecting base through the connector, and the multiple pre-tightening rod limiting cylinders are installed on the connecting plate at intervals around the axis of the connecting plate.

4. The nuclear power plant reactor guide tube pad installation device according to claim 3, characterized in that, A washer is provided inside the pretensioning rod limiting cylinder, and the washer is located at the bottom of the pretensioning rod limiting cylinder.

5. The nuclear power plant reactor guide tube pad installation device according to claim 3, characterized in that, At least two of the pretensioning rod limiting cylinders have limiting plates, which are disposed at the bottom of the pretensioning rod limiting cylinder and are correspondingly disposed with respect to the clamping structure.

6. The nuclear power plant reactor guide tube pad installation device according to claim 1, characterized in that, The rotating assembly includes a handle and a lifting rod. The handle is connected to one end of the lifting rod, which is mounted on the lifting head mechanism. The other end of the lifting rod is connected to the connecting assembly.

7. The nuclear power plant reactor guide tube pad installation device according to claim 6, characterized in that, The rotating assembly also includes a limiting pin. The lifting rod is provided with two first limiting blocks and a first limiting hole. The lifting head mechanism is provided with two second limiting blocks and a second limiting hole. The first limiting blocks and the corresponding second limiting blocks are configured to define the rotation space between the first position and the second position. The first limiting block is correspondingly provided with the second limiting hole, and the limiting pin is matched with the first limiting hole and the second limiting hole.

8. The nuclear power plant reactor guide tube pad installation device according to claim 1, characterized in that, The connecting assembly includes multiple inner rods and inner rod connectors. The multiple inner rods are connected in sequence, and two adjacent inner rods are connected through the inner rod connectors. The two inner rods at both ends are respectively connected to the rotating assembly and the pad mounting and positioning assembly.

9. The nuclear power plant reactor guide tube pad installation device according to claim 1, characterized in that, The nuclear power plant reactor guide tube pad installation device also includes a main connecting long rod assembly and an end connecting long rod assembly. The main connecting long rod assembly and the end connecting long rod assembly are connected in sequence and sleeved around the connecting assembly. One end of the main connecting long rod assembly is connected to the lifting head mechanism, and the other end is connected to one end of the end connecting long rod assembly. The other end of the end connecting long rod assembly is connected to the pad installation and positioning assembly.

10. The nuclear power plant reactor guide tube pad installation device according to claim 9, characterized in that, The main connecting rod assembly includes a main connecting rod, a first tightening male head, a first nut bushing base, a first female head nut bushing, and a first tightening female head nut. The first tightening male head is disposed at one end of the main connecting rod, the first nut bushing base is disposed at the other end of the main connecting rod, one end of the first female head nut bushing is connected to the first nut bushing base, and the other end is connected to the first tightening female head nut.

11. The nuclear power plant reactor guide tube pad installation device according to claim 10, characterized in that, The main connecting rod has screw connectors at both ends, and the first tightening male head and the first nut bushing base are respectively fixed to the main connecting rod by the corresponding screw connectors.

12. The nuclear power plant reactor guide tube pad installation device according to claim 9, characterized in that, The end connecting rod assembly includes a second tightening male, an end connecting component, and an intermediate connecting tube assembly. The second tightening male is disposed at one end of the intermediate connecting tube assembly and is connected to the main connecting rod assembly. The end connecting component is disposed at the other end of the intermediate connecting tube assembly and is connected to the pad mounting and positioning assembly.

13. The nuclear power plant reactor guide tube pad installation device according to claim 12, characterized in that, The intermediate connecting tube assembly includes a reinforcing sleeve and an intermediate connecting tube sleeved around the reinforcing sleeve. A portion of the reinforcing sleeve is exposed outside the intermediate connecting tube, and the exposed portions of the intermediate connecting tube and the reinforcing sleeve are connected to the second tightening male connector.

14. The nuclear power plant reactor guide tube pad installation device according to claim 9, characterized in that, The lifting mechanism includes a lifting head, a support body, a connecting cylinder, a second nut bushing base, a second female nut bushing, and a second tightening nut. One end of the lifting head is connected to the support body, and the other end of the support body is connected to one end of the connecting cylinder. The rotating component is mounted on the support body and partially located within the support body. The second nut bushing base is disposed around the connecting cylinder, and the second female nut bushing is disposed between the connecting cylinder and the second nut bushing base. The second tightening nut is installed at the end of the second female nut bushing away from the second nut bushing base, and there is a gap between the inner wall of the second tightening nut and the outer wall of the second female nut bushing. The second tightening nut is connected to the main connecting rod assembly.

15. The nuclear power plant reactor guide tube pad installation device according to claim 14, characterized in that, The lifting mechanism also includes an upper sleeve, a lower sleeve, and a sliding bearing. The upper sleeve is installed at the top inside the support body, the lower sleeve is installed at the bottom inside the support body, and the sliding bearing is installed between the upper sleeve and the lower sleeve.

16. The nuclear power plant reactor guide tube pad installation device according to claim 9, characterized in that, The pretensioning rod top mechanism includes a top base, a limiting sleeve, a first locking sleeve, and a locking member for locking the pretensioning rod mechanism and the limiting sleeve. The limiting sleeve has a locking hole. The top base has a first through hole and a plurality of second through holes disposed around the first through hole. The first locking sleeve is disposed in the first through hole, and the limiting sleeve is disposed in the corresponding second through hole. The first locking sleeve is installed on the main connecting long rod assembly. The pretensioning rod mechanism passes through the limiting sleeve, and the locking member locks the pretensioning rod mechanism through the locking hole.

17. The nuclear power plant reactor guide tube pad installation device according to claim 9, characterized in that, The nuclear power plant reactor guide tube pad installation device also includes multiple pre-tightening rod intermediate assemblies, which are disposed on the corresponding main connecting long rod assemblies.

18. The nuclear power plant reactor guide tube pad installation device according to claim 17, characterized in that, The pretensioning rod intermediate assembly includes an intermediate base and a second locking sleeve. The intermediate base has a third through hole and a plurality of fourth through holes disposed around the third through hole. The second locking sleeve is disposed on the third through hole and is installed on the main connecting long rod assembly. The pretensioning rod mechanism passes through the fourth through holes.

Images