MSIV hoisting tool

Abstract

The application belongs to the technical field of hoisting devices, and discloses a MSIV hoisting tool, which comprises a bottom plate, vertical plates, vertical rods, a mounting frame and a rotating mechanism; the vertical plates and the vertical rods are both fixed to the top of the bottom plate, and both are provided with a plurality of vertical plates, and each vertical plate is provided with a lifting hole; the mounting frame is arranged between the plurality of vertical plates, and comprises a U-shaped frame and a blocking rod; the frame bodies on the two sides of the U-shaped frame are respectively provided with a first clamping groove for clamping cooperation with one end of the MSIV and a second clamping groove for clamping cooperation with the other end of the MSIV; one end of the blocking rod is hinged to the top of the frame body of the U-shaped frame, the blocking rod is provided with two blocking rods and is arranged on the frame bodies on the two sides of the U-shaped frame, and the U-shaped frame is provided with a fixing assembly for simultaneously fixing the two blocking rods; the rotating mechanism is arranged on the vertical rod and is used for driving the U-shaped frame to rotate. The application can hoist and overturn the MSIV, thereby facilitating rapid maintenance of the MSIV.

Description

Technical Field

[0001] This invention relates to the field of hoisting equipment technology, and in particular to an MSIV hoisting fixture. Background Technology

[0002] The Main Steam Isolation Valve (MSIV) is a core and critical piece of equipment in the secondary loop main steam system piping of a nuclear power plant. Its operational status directly determines the integrity of the plant's safety barriers and its operational stability. Functionally, the primary role of the MSIV is rapid isolation during accident conditions. The valve can close quickly within 2-5 seconds, cutting off the flow of abnormal media in the main steam system and preventing the spread of the accident. Secondly, during reactor hot shutdown, the MSIV isolates the turbine-side main steam piping from the nuclear steam supply system, providing a safe isolation boundary for the maintenance of downstream equipment (such as condensers and feedwater system valves). Structurally, MSIVs generally adopt a symmetrical wedge design and are equipped with a pneumatic-hydraulic linkage actuator. The parameters of different MSIV models vary significantly; for example, the A290 actuator weighs approximately 1790 kg, while the A510 actuator weighs as much as 8030 kg. These large weight and size characteristics mean that MSIV maintenance must rely on specialized lifting equipment.

[0003] In the maintenance process of MSIVs (Main Steam Injection Vehicles), hoisting and attitude adjustment are indispensable key steps. Because the MSIV actuators are installed at critical nodes in the main steam pipeline, maintenance requires first safely lifting them from their installation position using tooling. Then, depending on the needs of different maintenance procedures such as depressurization disassembly, component inspection, and module reassembly, their spatial attitude is adjusted (e.g., flipped to horizontal, vertical, or a specific tilt angle), and finally transported to the maintenance platform or designated area. Currently, nuclear power plant sites mostly use monorail cranes with simple lifting beams and slings, or manual tilting frames, etc., for operations. While these tools can meet basic lifting requirements, with the increasing demands of nuclear power plants for maintenance efficiency, operational safety, and ease of operation, existing technologies are gradually becoming inadequate for the efficient maintenance scenarios of heavy MSIVs. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides an MSIV lifting fixture.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution: an MSIV lifting fixture, comprising a base plate, vertical plates, vertical rods, a mounting frame, and a rotating mechanism; both vertical plates and vertical rods are fixed to the top of the base plate, and both are provided in multiple manner, with each vertical plate having a lifting hole; the mounting frame is disposed between the multiple vertical plates, and includes a U-shaped frame and a stop bar; the frame bodies on both sides of the U-shaped frame are respectively provided with a first slot for engaging with one end of the MSIV and a second slot for engaging with the other end of the MSIV; one end of the stop bar is hinged to the top of the frame body of the U-shaped frame, and two stop bars are provided and respectively located on the frame bodies on both sides of the U-shaped frame, with a fixing component on the U-shaped frame for simultaneously fixing the two stop bars; the rotating mechanism is disposed on the vertical rod and is used to drive the U-shaped frame to rotate.

[0006] By adopting the above technical solution, after releasing the fixing components, workers can open the stop bars and engage the first and second slots with both ends of the MSIV respectively. Then, the stop bars are closed, and the fixing components simultaneously secure both stop bars, connecting the mounting frame to the MSIV. At this point, workers can hook the hook of the lifting tool with the lifting hole on the vertical plate to lift the mounting frame and MSIV as a whole. Workers can use a rotating mechanism to drive the U-shaped frame and MSIV to rotate in the air to adjust the MSIV's posture, facilitating the inspection and maintenance of larger MSIVs.

[0007] Furthermore, the fixing components include a crossbar, a connecting rod, a connecting plate, a limiting block, and a clamping spring; the crossbar is fixed between the frame bodies on both sides of the U-shaped frame, the two ends of the connecting rod are respectively fixed to two stop bars, the connecting plate is sleeved on the crossbar and rotatably connected to it, one side of the connecting plate is provided with a snap-fit ​​interface for the connecting rod to engage, and the inner wall of the snap-fit ​​interface is provided with a receiving groove; the limiting block is slidably engaged with the receiving groove, its length is greater than the width of the snap-fit ​​interface, the side of the limiting block near the opening of the snap-fit ​​interface is provided with an abutting slope, and the two ends of the clamping spring are respectively abutted against the side wall of the limiting block and the inner wall of the receiving groove on the side away from the snap-fit ​​interface.

[0008] By adopting the above technical solution, after the first and second slots are respectively engaged with both ends of the MSIV, the operator only needs to pull the connecting rod and rotate the two stop rods to allow the stop rods to enter the engagement interface. After the stop rods abut against the inclined surface, the limiting block can be pressed into the receiving groove. When the stop rods move to the side of the engagement interface away from its opening, the limiting block is reset under the action of the clamping spring and limits the connecting rod, ensuring the limiting effect of the two stop rods on the MSIV and the stability of the MSIV during hoisting and flipping.

[0009] Furthermore, the fixing assembly also includes a drive rod, a limiting plate, a positioning rod, a locking spring, and a lifting rod; the drive rod is rotatably installed in the receiving groove, the limiting block has a through hole for the drive rod to pass through, the side wall of the drive rod has a spiral groove, and the inner wall of the through hole has a drive block that slides with the spiral groove; the limiting plate is fixedly sleeved on the drive rod, the inner wall of the receiving groove has a mounting hole on the side away from the locking interface, the positioning rod is set in the mounting hole and slides with it, the limiting plate has a positioning hole on the side away from the locking interface that engages with one end of the positioning rod; one end of the locking spring is fixed to the side of the mounting hole away from the locking interface, and the other end is fixed to the side of the positioning rod away from the locking interface; the lifting rod is installed through the connecting plate and slides with it, one end is fixed to the positioning rod, and the diameter of the other end of the lifting rod is larger than the diameter of the lifting rod body.

[0010] By adopting the above technical solution, when the connecting rod is inserted into the card interface, the connecting rod abuts against the inclined surface and presses the limiting block into the receiving groove. The driving block in the through hole slides with the spiral groove, thereby making the driving rod and the limiting plate rotate synchronously. When the limiting block is fully inserted into the receiving groove, the positioning rod and the positioning hole on the limiting plate are misaligned. The end of the positioning rod presses against the limiting plate under the elastic force of the spring. When the connecting rod moves to the side of the limiting block away from the card interface opening, the limiting block resets under the action of the clamping spring, thereby preventing the connecting rod from loosening during MSIV hoisting and flipping. In addition, the positioning rod is engaged with the positioning hole under the action of the locking spring, which fully prevents the limiting block from being subjected to external force and causing the driving rod and the limiting plate to rotate, thus ensuring the limiting effect of the limiting block on the connecting rod. When it is necessary to open the stop lever, the operator only needs to pull the lifting rod to compress the locking spring of the positioning rod. After the positioning rod is disengaged from the positioning hole, the operator can press the abutting slope of the limit block to make the limit block retract into the receiving groove. Then, pulling the connecting rod can open the two stop levers.

[0011] Furthermore, a central shaft is fixed on one side of the U-shaped frame, and two central shafts are provided and symmetrically distributed. A flip trunnion is fixed on the other side of the U-shaped frame. The rotating mechanism includes a track assembly and a drive assembly. The track assembly includes an inner ring and an outer ring. Both the inner ring and the outer ring are fixed on the vertical rod and are coaxial with the central shaft. The flip trunnion slides in contact with the outer side of the inner ring and the inner side of the outer ring. The drive assembly is set on the U-shaped frame and is used to drive the flip trunnion to rotate around the central shaft.

[0012] By adopting the above technical solution, the operator can drive the flip trunnion to rotate around the central axis through the drive component, thereby making the U-shaped frame fixed with the flip trunnion rotate synchronously, so that the U-shaped frame and MSIV can complete synchronous flipping.

[0013] Furthermore, the drive assembly includes a ring rack, a rotating rod, a drive gear, a worm gear, a motor, and a worm. The ring rack is fixed on the inner ring and coaxial with it. The rotating rod is rotatably mounted on a flip trunnion. The drive gear and the worm gear are both fixedly sleeved on the rotating rod. The drive gear meshes with the ring rack. The motor is fixed on a U-shaped frame. The worm gear is fixed to the output end of the motor and meshes with the worm gear.

[0014] By adopting the above technical solution, the motor can drive the worm to rotate after it starts working. The worm drives the worm wheel that meshes with it, the rotating rod that is fixed to the worm wheel, and the driving gear that is fixed to the rotating rod to rotate. Since the driving gear meshes with the ring rack and the ring rack is fixed to the inner ring on the vertical rod, the rotating rod, the flipping trunnion, the U-shaped frame, and the MSIV can be flipped synchronously to adjust the attitude of the MSIV and facilitate maintenance by the staff.

[0015] Furthermore, a battery for powering the motor is fixed on the U-shaped frame, and a controller that communicates with the motor is fixed on one of the vertical plates.

[0016] By adopting the above technical solution, the battery supplies power to the motor independently, and both the battery and the motor rotate synchronously with the U-shaped frame, avoiding the situation where the power supply wires become tangled due to the use of an external power source.

[0017] Furthermore, the hinge point between the stop bar and the frame of the U-shaped frame is located on the side closer to the inner ring, and the fixing component is located on the side of the U-shaped frame away from the inner ring.

[0018] By adopting the above technical solution, the fixing component is located on the side away from the inner ring, which provides a larger operating space and makes it easier for staff to remove the fixing component from the connecting rod, thereby facilitating the installation or removal of the mounting bracket from the MSIV.

[0019] Furthermore, the U-shaped frame is provided with a hinge assembly for hinged to the stop bar. The hinge assembly includes a Z-shaped plate, a hinge shaft, and a torsion spring. The Z-shaped plate is fixed to the top of the U-shaped frame, the hinge shaft is fixed to the stop bar, and the end of the hinge shaft is rotatably connected to the Z-shaped plate. The torsion spring is sleeved on the hinge shaft, and its two ends are fixed to the Z-shaped plate and the stop bar, respectively.

[0020] By adopting the above technical solution, the torsion spring has a good torsional effect. When the connecting rod is disengaged from the locking interface on the connecting plate, the stop bar remains open under the torsion of the torsion spring, so that the staff can connect the U-shaped frame to the MSIV.

[0021] Furthermore, the bottom of the stop bar is integrally formed with an arc-shaped block, and the bottom of the arc-shaped block is fitted and fixed with a pad that matches the outer wall of the MSIV.

[0022] By adopting the above technical solution, the pads on the arc-shaped block are made of rubber material, which has good elasticity, reduces the frictional damage to the MSIV caused by the arc-shaped block during MSIV hoisting and flipping, and ensures the stability of the MSIV to a certain extent.

[0023] Furthermore, rubber sheets are fixed to the inner walls of both the first and second card slots.

[0024] By adopting the above technical solution, the rubber sheet is made of rubber material, which has good elasticity and stability, reducing the frictional damage to the MSIV caused by the U-shaped frame during MSIV hoisting and flipping, and further ensuring the stability of the MSIV.

[0025] In summary, the present invention has the following beneficial effects: 1. In this application, after releasing the fixing components, the operator can open the stop bars and engage the first and second slots with both ends of the MSIV, then close the stop bars. The fixing components can then simultaneously fix both stop bars, connecting the mounting frame to the MSIV. At this point, the operator can hook the hook of the lifting tool with the lifting hole on the vertical plate to lift the mounting frame and MSIV as a whole. The operator can use a rotating mechanism to drive the U-shaped frame and MSIV to rotate in the air to adjust the MSIV's posture, facilitating the inspection and maintenance of larger MSIVs. 2. In this application, after the motor is working, it can drive the worm to rotate. The worm drives the worm wheel that meshes with it, the rotating rod that is fixed to the worm wheel, and the driving gear that is fixed to the rotating rod to rotate. Since the driving gear meshes with the ring rack and the ring rack is fixed to the inner ring on the vertical rod, the rotating rod, the flipping trunnion, the U-shaped frame and the MSIV can be flipped synchronously to adjust the attitude of the MSIV and facilitate maintenance by the staff. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the structure of the fixing component used to highlight Embodiment 1 of the present invention; Figure 3 yes Figure 2 Enlarged view of point A in the middle; Figure 4 yes Figure 2 Enlarged view of point B in the middle; Figure 5 This is a schematic diagram of the structure of Embodiment 1 of the present invention used to highlight the MSIV flipped to a vertical state; Figure 6 This is a schematic diagram of the structure of the mounting bracket in Embodiment 1 of the present invention; Figure 7This is a schematic diagram of the structure of Embodiment 1 of the present invention, which highlights the retraction of the limiting block into the receiving groove; Figure 8 This is a schematic diagram of the overall structure of Embodiment 2 of the present invention.

[0027] In the diagram: 1. Base plate; 2. Vertical plate; 21. Lifting hole; 3. Vertical rod; 4. Mounting bracket; 41. U-shaped bracket; 411. First slot; 412. Second slot; 413. Central shaft; 414. Flip trunnion; 415. Battery; 416. Controller; 42. Stop bar; 5. Rotating mechanism; 51. Track assembly; 511. Inner ring; 512. Outer ring; 52. Drive assembly; 521. Ring rack; 522. Rotating rod; 523. Drive gear; 524. Worm gear; 525. Motor; 526. Worm; 6. Fixing assembly; 60. Crossbar; 61. Connecting rod; 62. Connecting plate; 621. Card interface; 622. Receiving groove; 63. Limiting block; 631. Abutting slope; 632. Through hole; 6321. Drive block; 64. Pressing spring; 65. Drive rod; 651. Spiral groove; 66. Limiting plate; 661. Mounting hole; 662. Positioning hole; 67. Positioning rod; 68. Locking spring; 69. Lifting rod; 7. Hinge assembly; 71. Z-shaped plate; 72. Hinge shaft; 73. Torsion spring; 8. Arc block; 81. Pad; 9. Rubber sheet; 10. Sliding sleeve; 11. Lifting assembly; 111. Electric push rod; 112. Connecting block. Detailed Implementation

[0028] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. Example 1

[0029] like Figure 1-7As shown in the figure, this application discloses an MSIV lifting fixture, including a base plate 1, vertical plates 2, vertical rods 3, a mounting frame 4, and a rotating mechanism 5. The vertical plates 2 and vertical rods 3 are both fixed to the top of the base plate 1, and both have multiple vertical plates 2, each with a lifting hole 21. The mounting frame 4 is disposed between the multiple vertical plates 2, and includes a U-shaped frame 41 and stop bars 42. The frame bodies on both sides of the U-shaped frame 41 are respectively provided with a first slot 411 for engaging with one end of the MSIV and a second slot 412 for engaging with the other end of the MSIV. One end of the stop bar 42 is hinged to the top of the frame body of the U-shaped frame 41. Two stop bars 42 are provided and located on the frame bodies on both sides of the U-shaped frame 41. The U-shaped frame 41 is provided with a fixing assembly 6 for simultaneously fixing the two stop bars 42. The rotating mechanism 5 is disposed on the vertical rods 3 and is used to drive the U-shaped frame 41 to rotate. It is worth noting that when the MSIV is in normal use, its mushroom-shaped end faces upwards.

[0030] After releasing the fixing component 6, the operator can open the stop bar 42 and engage the first slot 411 and the second slot 412 with both ends of the MSIV respectively. Then, close the stop bar 42, and the fixing component 6 can simultaneously fix both stop bars 42, thus connecting the mounting frame 4 and the MSIV. At this point, the operator can hook the hook of the lifting tool with the lifting hole 21 on the vertical plate 2 to lift the mounting frame 4 and the MSIV as a whole. The operator can use the rotating mechanism 5 to drive the U-shaped frame 41 and the MSIV to rotate in the air to adjust the MSIV's posture, facilitating the inspection of larger MSIVs.

[0031] The fixing component 6 includes a crossbar 60, a connecting rod 61, a connecting plate 62, a limiting block 63, and a clamping spring 64. The crossbar 60 is fixed between the frame bodies on both sides of the U-shaped frame 41. The two ends of the connecting rod 61 are fixed to the two stop bars 42 respectively. The connecting plate 62 is sleeved on the crossbar 60 and rotatably connected to it. One side of the connecting plate 62 is provided with a locking interface 621 for the connecting rod 61 to engage. The inner wall of the locking interface 621 is provided with a receiving groove 622. The limiting block 63 is slidably engaged with the receiving groove 622. Its length is greater than the width of the locking interface 621. The side of the limiting block 63 near the opening of the locking interface 621 is provided with an abutting inclined surface 631. The two ends of the clamping spring 64 are respectively abutted against the side wall of the limiting block 63 and the inner wall of the receiving groove 622 away from the locking interface 621.

[0032] After the first slot 411 and the second slot 412 are respectively engaged with both ends of the MSIV, the operator only needs to pull the connecting rod 61 and rotate the two stop rods 42 so that the stop rods 42 enter the slot interface 621. After the stop rods 42 abut against the abutting inclined surface 631, the limiting block 63 can be pressed into the receiving groove 622. When the stop rods 42 move to the side of the slot interface 621 away from its opening, the limiting block 63 is reset under the action of the clamping spring 64 and limits the connecting rod 61, ensuring the limiting effect of the two stop rods 42 on the MSIV and the stability of the MSIV during hoisting and flipping.

[0033] The fixing assembly 6 also includes a drive rod 65, a limiting plate 66, a positioning rod 67, a locking spring 68, and a lifting rod 69; the drive rod 65 is rotatably mounted in the receiving groove 622, the limiting block 63 has a through hole 632 for the drive rod 65 to pass through, the side wall of the drive rod 65 has a spiral groove 651, and the inner wall of the through hole 632 is fixed with a drive block 6321 that slides with the spiral groove 651; the limiting plate 66 is fixedly sleeved on the drive rod 65, and the inner wall of the receiving groove 622 has a mounting hole 661 on the side away from the card interface 621. The positioning rod 67 is set in the mounting hole 661 and slides therewith. The limiting plate 66 has a positioning hole 662 on the side away from the card interface 621, which is engaged with one end of the positioning rod 67. One end of the locking spring 68 is fixed to the side of the mounting hole 661 away from the card interface 621, and the other end is fixed to the side of the positioning rod 67 away from the card interface 621. The lifting rod 69 is set through the connecting plate 62 and slides therewith. One end of the lifting rod 69 is fixed to the positioning rod 67, and the diameter of the other end of the lifting rod 69 is larger than the diameter of the main body of the lifting rod 69.

[0034] As the connecting rod 61 is inserted into the card interface 621, it abuts against the inclined surface 631 and presses the limiting block 63 into the receiving groove 622. The driving block 6321 in the through hole 632 slides with the spiral groove 651, thereby causing the driving rod 65 and the limiting plate 66 to rotate synchronously. When the limiting block 63 is fully inserted into the receiving groove 622, the positioning rod 67 and the positioning hole 662 on the limiting plate 66 are misaligned. The end of the positioning rod 67 presses against the limiting plate 66 under the elastic force of the spring. When the connecting rod 61 moves to the side of the limiting block 63 away from the opening of the locking interface 621, the limiting block 63 resets under the action of the clamping spring 64, thus preventing the connecting rod 61 from loosening during MSIV hoisting and flipping. Furthermore, the positioning rod 67 engages with the positioning hole 662 under the action of the locking spring 68, effectively preventing the driving rod 65 and the limiting plate 66 from rotating due to external force on the limiting block 63, ensuring the limiting effect of the limiting block 63 on the connecting rod 61. When it is necessary to open the stop lever 42, the operator only needs to pull the lifting rod 69, causing the positioning rod 67 to compress the locking spring 68. After the positioning rod 67 disengages from the positioning hole 662, the operator can press the abutting inclined surface 631 of the limiting block 63 to allow the limiting block 63 to retract into the receiving groove 622. Then, pulling the connecting rod 61 will open both stop levers 42.

[0035] A central shaft 413 is fixed to one side of the frame of the U-shaped frame 41. Two central shafts 413 are provided and symmetrically distributed. A flipping trunnion 414 is fixed to the other side of the frame of the U-shaped frame 41. The rotating mechanism 5 includes a track assembly 51 and a drive assembly 52. ​​The track assembly 51 includes an inner ring 511 and an outer ring 512. Both the inner ring 511 and the outer ring 512 are fixed to the vertical rod 3 and are coaxial with the central shaft 413. The flipping trunnion 414 is slidably engaged with the outer side of the inner ring 511 and the inner side of the outer ring 512. The drive assembly 52 is set on the U-shaped frame 41 and is used to drive the flipping trunnion 414 to rotate around the central shaft 413. The operator can drive the flipping trunnion 414 to rotate around the central shaft 413 by using the drive assembly 52, so that the U-shaped frame 41 fixed with the flipping trunnion 414 rotates synchronously, thereby enabling the U-shaped frame 41 and MSIV to complete synchronous flipping.

[0036] The drive assembly 52 includes an annular rack 521, a rotating rod 522, a drive gear 523, a worm gear 524, a motor 525, and a worm 526. The annular rack 521 is fixed on the inner ring 511 and coaxial with it. The rotating rod 522 is rotatably mounted on the flip trunnion 414. The drive gear 523 and the worm gear 524 are both fixedly sleeved on the rotating rod 522. The drive gear 523 meshes with the annular rack 521. The motor 525 is fixed on the U-shaped frame 41. The worm 526 is fixed to the output end of the motor 525 and meshes with the worm gear 524.

[0037] After the motor 525 starts working, it drives the worm 526 to rotate. The worm 526 drives the worm wheel 524, which meshes with it, the rotating rod 522 fixed to the worm wheel 524, and the driving gear 523 fixed to the rotating rod 522 to rotate. Since the driving gear 523 meshes with the ring rack 521, and the ring rack 521 is fixed to the inner ring 511 on the vertical rod 3, the rotating rod 522, the flipping trunnion 414, the U-shaped frame 41, and the MSIV can rotate synchronously to adjust the MSIV's posture and facilitate maintenance. Because the worm wheel 524 and the worm 526 have a self-locking function (the worm wheel 524 can only be driven to rotate by the rotation of the worm 526, but the worm wheel 524 will not drive the worm 526 to rotate), when the motor 525 stops working, the worm wheel 524, the rotating rod 522, and the driving gear 523 all have good stability, thus ensuring the stability of the MSIV during maintenance.

[0038] A battery 415 for powering the motor 525 is fixed on the U-shaped frame 41, and a controller 416 communicating with the motor 525 is fixed on one of the vertical plates 2. The battery 415 supplies power to the motor 525 independently, and both the battery 415 and the motor 525 rotate synchronously with the U-shaped frame 41, avoiding the tangling of power cables caused by using an external power source. In this embodiment, the motor 525 is a Kinco SMH60S-0075-30ABK-3LBS servo motor 525, which can be equipped with a 100:1 planetary gear reducer, with a final output torque ≥143400 N·m. The controller 416 is a Wecon LEVI700LK touch screen PLC all-in-one machine + Bluetooth module WT-01, which communicates wirelessly with the motor 525 driver via Bluetooth module, avoiding cable tangling when the U-shaped frame 41 rotates.

[0039] The hinge point between the stop bar 42 and the frame of the U-shaped frame 41 is located on the side closer to the inner ring 511, and the fixing component 6 is located on the side of the U-shaped frame 41 away from the inner ring 511. The fixing component 6 is located on the side away from the inner ring 511, which provides a larger operating space and makes it easier for the operator to release the fixing component 6 from the restriction on the connecting rod 61, thereby facilitating the installation or removal of the mounting bracket 4 from the MSIV.

[0040] The U-shaped frame 41 is equipped with a hinge assembly 7 for hinged to the stop bar 42. The hinge assembly 7 includes a Z-shaped plate 71, a hinge shaft 72, and a torsion spring 73. The Z-shaped plate 71 is fixed to the top of the U-shaped frame 41, and the hinge shaft 72 is fixed to the stop bar 42, with its end rotatably connected to the Z-shaped plate 71. The torsion spring 73 is sleeved on the hinge shaft 72, with its two ends fixed to the Z-shaped plate 71 and the stop bar 42, respectively. The torsion spring 73 has good torsional force. When the connecting rod 61 disengages from the locking interface 621 on the connecting plate 62, the stop bar 42 remains open under the torsion of the torsion spring 73, allowing the operator to connect the U-shaped frame 41 to the MSIV.

[0041] The bottom of the stop bar 42 is integrally formed with an arc-shaped block 8, and a pad 81 that mates with the outer wall of the MSIV is attached and fixed to the bottom of the arc-shaped block 8. The pad 81 on the arc-shaped block 8 is made of rubber material, which has good elasticity, reduces the frictional damage to the MSIV caused by the arc-shaped block 8 during MSIV hoisting and flipping, and ensures the stability of the MSIV to a certain extent.

[0042] Rubber sheets 9 are fixed to the inner walls of both the first slot 411 and the second slot 412. The rubber sheets 9 are made of rubber material, which has good elasticity and stability, reducing frictional damage to the MSIV caused by the U-shaped frame 41 during MSIV hoisting and flipping, and further ensuring the stability of the MSIV. Example 2

[0043] like Figure 8 As shown, the difference between this embodiment and Embodiment 1 is only that: multiple vertically arranged sliding sleeves 10 are fixed on the base plate 1; the vertical plate 2 and vertical rod 3 are not directly fixed to the top of the base plate 1, but slide in cooperation with their respective sliding sleeves 10 (and the vertical plate 2 and vertical rod 3 are fixed to each other); the controller 416 is fixed to one of the sliding sleeves 10. The MSIV lifting fixture also includes a lifting assembly 11, which has two sets located adjacent to two opposite corners of the base plate 1, and includes an electric push rod 111 and a connecting block 112. The electric push rod 111 is fixed to the base plate 1, and the connecting block 112 is fixed to the vertical plate 2, with the bottom of the vertical plate 2 fixed to the upper end of the output rod of the electric push rod 111. To facilitate the adjustment of the height of the lifting fixture for MSIV maintenance, the operator only needs to control the electric push rod 111 through the controller 416, thereby adjusting the height of the vertical plate 2 and vertical rod 3 through the connecting block 112, which helps to improve the maintenance efficiency of the MSIV.

[0044] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A lifting fixture for MSIV, characterized in that: It includes a base plate (1), a vertical plate (2), a vertical rod (3), a mounting bracket (4), and a rotating mechanism (5); Both the vertical plate (2) and the vertical rod (3) are fixed to the top of the base plate (1), and both are provided in multiples. Each vertical plate (2) is provided with a lifting hole (21). The mounting bracket (4) is set between multiple vertical plates (2), and includes a U-shaped frame (41) and a stop bar (42); the frame body on both sides of the U-shaped frame (41) is provided with a first slot (411) for engaging with one end of the MSIV and a second slot (412) for engaging with the other end of the MSIV; one end of the stop bar (42) is hinged to the top of the frame body of the U-shaped frame (41), and there are two stop bars (42) respectively located on the frame body on both sides of the U-shaped frame (41); the U-shaped frame (41) is provided with a fixing component (6) for fixing the two stop bars (42) at the same time; The rotating mechanism (5) is mounted on the vertical rod (3) and is used to drive the U-shaped frame (41) to rotate. The fixing component (6) includes a crossbar (60), a connecting rod (61), a connecting plate (62), a limiting block (63), and a clamping spring (64); The crossbar (60) is fixed between the frame bodies on both sides of the U-shaped frame (41). The two ends of the connecting rod (61) are fixed to the two stop bars (42) respectively. The connecting plate (62) is sleeved on the crossbar (60) and rotatably connected to it. A snap-fit ​​interface (621) for the connecting rod (61) to snap-fit ​​is provided on one side of the connecting plate (62), and a receiving groove (622) is provided on the inner wall of the snap-fit ​​interface (621). The limiting block (63) slides with the receiving groove (622), and its length is greater than the width of the card interface (621). The limiting block (63) has an abutting slope (631) on the side near the opening of the card interface (621). The two ends of the clamping spring (64) abut against the side wall of the limiting block (63) and the inner wall of the receiving groove (622) away from the card interface (621), respectively. The fixing assembly (6) also includes a drive rod (65), a limiting plate (66), a positioning rod (67), a locking spring (68), and a lifting rod (69); The drive rod (65) is rotatably mounted in the receiving groove (622). A through hole (632) is provided through the limiting block (63) for the drive rod (65) to pass through. A spiral groove (651) is provided on the side wall of the drive rod (65). A drive block (6321) that slides with the spiral groove (651) is fixed on the inner wall of the through hole (632). The limiting plate (66) is fixedly sleeved on the drive rod (65). An installation hole (661) is provided on the side of the inner wall of the receiving groove (622) away from the card interface (621). The positioning rod (67) is set in the installation hole (661). And slides with it, the limiting plate (66) is provided with a positioning hole (662) on the side away from the card interface (621) to engage with one end of the positioning rod (67); one end of the locking spring (68) is fixed to the side of the mounting hole (661) away from the card interface (621), and the other end is fixed to the side of the positioning rod (67) away from the card interface (621); the lifting rod (69) is installed through the connecting plate (62) and slides with it, one end of which is fixed to the positioning rod (67), and the diameter of the other end of the lifting rod (69) is larger than the diameter of the main body of the lifting rod (69).

2. The MSIV lifting fixture according to claim 1, characterized in that: A central shaft (413) is fixed on one side of the frame of the U-shaped frame (41). There are two central shafts (413) and they are symmetrically distributed. A flip trunnion (414) is fixed on the other side of the frame of the U-shaped frame (41). The rotating mechanism (5) includes a track assembly (51) and a drive assembly (52). The track assembly (51) includes an inner ring (511) and an outer ring (512). Both the inner ring (511) and the outer ring (512) are fixed on the vertical rod (3) and are coaxial with the central axis (413). The flipping trunnion (414) is slidably engaged with the outer side of the inner ring (511) and the inner side of the outer ring (512). The drive assembly (52) is mounted on the U-shaped frame (41) and is used to drive the flipping trunnion (414) to rotate around the central axis (413).

3. The MSIV lifting fixture according to claim 2, characterized in that: The drive assembly (52) includes a ring rack (521), a rotating rod (522), a drive gear (523), a worm gear (524), a motor (525), and a worm (526). The ring rack (521) is fixed on the inner ring (511) and coaxial with it. The rotating rod (522) is rotatably mounted on the flip trunnion (414). The drive gear (523) and the worm gear (524) are both fixedly sleeved on the rotating rod (522). The drive gear (523) meshes with the ring rack (521). The motor (525) is fixed on the U-shaped frame (41). The worm (526) is fixed to the output end of the motor (525), and the worm (526) meshes with the worm gear (524).

4. The MSIV lifting fixture according to claim 3, characterized in that: A battery (415) for powering a motor (525) is fixed on a U-shaped frame (41), and a controller (416) that is in communication with the motor (525) is fixed on one of the vertical plates (2).

5. The MSIV lifting fixture according to claim 3, characterized in that: The hinge point between the stop bar (42) and the frame of the U-shaped frame (41) is located on the side closer to the inner ring (511), and the fixing component (6) is located on the side of the U-shaped frame (41) away from the inner ring (511).

6. The MSIV lifting fixture according to claim 5, characterized in that: The U-shaped frame (41) is provided with a hinge assembly (7) for hinged to the stop bar (42). The hinge assembly (7) includes a Z-shaped plate (71), a hinge shaft (72), and a torsion spring (73). The Z-shaped plate (71) is fixed to the U-shaped frame (41) near its top. The hinge shaft (72) is fixed to the stop bar (42). The end of the hinge shaft (72) is rotatably connected to the Z-shaped plate (71). The torsion spring (73) is sleeved on the hinge shaft (72). Its two ends are fixed to the Z-shaped plate (71) and the stop bar (42) respectively.

7. The MSIV lifting fixture according to claim 5, characterized in that: The bottom of the stop bar (42) is integrally formed with an arc-shaped block (8), and the bottom of the arc-shaped block (8) is fitted and fixed with a pad (81) that matches the outer wall of the MSIV.

8. The MSIV lifting fixture according to claim 5, characterized in that: Rubber sheets (9) are fixed to the inner walls of both the first slot (411) and the second slot (412).

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