Remote unlocking device of fuel assembly inspection lifting platform

Abstract

The utility model discloses a remote unlocking device of a fuel assembly inspection lifting platform. The remote unlocking device comprises an unlocking power mechanism, an unlocking transmission mechanism and a platform lifting mechanism. The platform lifting mechanism comprises a first driving unit, a first gear arranged on an output shaft of the first driving unit, and a second gear meshed with a side rack of the inspection basket; the unlocking transmission mechanism comprises an unlocking gear, and the unlocking gear is used for being meshed with the first gear and the second gear; and the unlocking power mechanism is connected with the unlocking transmission mechanism, drives the unlocking transmission mechanism to act, and drives the unlocking gear to get close to be meshed with the first gear and the second gear or get away from the unlocking gear to be disconnected from the first gear and the second gear. The unlocking device is matched between the inspection basket and the inspection lifting platform, the unlocking power mechanism can drive the unlocking gear of the unlocking transmission mechanism to be separated from the gear of the platform lifting mechanism in a transmission mode, meshing of the platform lifting mechanism and the gear on the upper side edge of the inspection basket is cut off, the unlocking purpose is achieved, and operation is convenient and fast.

Description

Technical Field

[0001] The utility model relates to an unlocking device for a platform, in particular to a remote unlocking device for a fuel assembly inspection and lifting platform. Background Art

[0002] During operation, nuclear fuel assemblies are subject to long-term exposure to complex and volatile environments such as high temperature, high pressure, and high radiation. These conditions can cause deformation and distortion of the fuel assembly, swelling of the fuel rods in length and diameter due to irradiation, and corrosion and the formation of oxide films on the outer surfaces of the cladding tubes, guide tubes, and racks. In extreme cases, such as damaged ribbons or the presence of foreign matter within the fuel assembly, internal assembly status inspections and foreign object detection are necessary. Therefore, multifunctional fuel assembly inspections are necessary when newly developed fuel assemblies undergo in-reactor testing or when unexpected changes occur during the operation of mature commercial fuel assemblies.

[0003] Multifunctional fuel assembly inspection devices are typically placed above spent fuel pool racks or temporarily mounted on fuel elevators. The devices utilize the relative motion between the fuel assemblies and the multifunctional inspection device to perform multifunctional inspections of the fuel assemblies. However, this placement and inspection process constantly occupies the spent fuel pool's overhead crane, resulting in insufficient crane utilization. Currently, some nuclear power plants are addressing this issue by installing inspection baskets in their spent fuel pools.

[0004] The inspection basket is equipped with vertical guide rails on both sides, and a rack on one side for vertical movement of the inspection equipment lifting platform. Considering the safety risks caused by unexpected power outages, the drive motor for vertical lifting is generally equipped with a brake. Fuel inspection equipment operates in a high-dose underwater area that is inaccessible to personnel. When the brake is triggered, the equipment remains in the fault position and tightly meshes with the rack, making it impossible to release the two and move the inspection equipment out of the water. Generally, when the gear rack is remotely unlocked, the intermediate transmission tooth is pushed axially to disconnect the transmission device. Under this operating condition, due to the large load, the intermediate tooth is difficult to remove through the remote operating mechanism, which can easily cause unlocking failure. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide an improved remote unlocking device for a fuel assembly inspection lifting platform.

[0006] The technical solution adopted by the utility model to solve the technical problem is: providing a remote unlocking device for a fuel assembly inspection lifting platform, which is matched between the inspection basket and the inspection lifting platform, and the remote unlocking device includes an unlocking power mechanism, an unlocking transmission mechanism and a platform lifting mechanism;

[0007] The platform lifting mechanism includes a first drive unit, a first gear provided on the output shaft of the first drive unit, and a second gear meshing with a side rack of the inspection basket and spaced apart from the first gear; the unlocking transmission mechanism includes an unlocking gear, the unlocking gear being configured to mesh with the first gear and the second gear respectively;

[0008] The unlocking power mechanism is connected to the unlocking transmission mechanism, driving the unlocking transmission mechanism to move, and driving the unlocking gear to move closer to engage with the first gear and the second gear, or move away to disconnect the engagement with the first gear and the second gear.

[0009] In some embodiments, the first gear and the second gear are at the same level, and the unlocking gear is located above the first gear and the second gear.

[0010] In some embodiments, the unlocking transmission mechanism further includes a gear transmission unit, a transmission rack, and a connecting rod;

[0011] The gear transmission unit is in transmission connection with the unlocking power mechanism, the connecting rod extends horizontally and is rotatably arranged between the platform lifting mechanism and the unlocking power mechanism, the transmission rack is vertically arranged on the first end of the connecting rod and meshes with the gear transmission unit, and the unlocking gear is rotatably arranged on the second end of the connecting rod.

[0012] In some embodiments, the unlocking power mechanism includes a second drive unit, a third gear disposed on an output shaft of the second drive unit;

[0013] The gear transmission unit includes a fourth gear meshed with the third gear, a worm coaxially arranged with the fourth gear, a worm wheel meshed with the worm, and a fifth gear coaxially arranged with the worm wheel; the fifth gear meshes with the transmission rack, and the fifth gear can drive the transmission rack meshed with it to move up and down when it rotates.

[0014] In some embodiments, the first end of the connecting rod is provided with a positioning groove, and one end of the transmission rack is fitted into and fixed in the positioning groove;

[0015] The unlocking gear is located on a side of the second end of the connecting rod facing the first driving unit and is rotatably connected to the second end of the connecting rod.

[0016] In some embodiments, the remote unlocking device further includes a support base; the unlocking power mechanism, the unlocking transmission mechanism and the platform lifting mechanism are all arranged on the support base.

[0017] In some embodiments, the support base includes a first seat portion and a second seat portion, wherein the first seat portion and the second seat portion are vertically connected to each other on a horizontal plane to form a T-shaped base;

[0018] The second seat portion defines a strip groove, and the first gear and the second gear fit into the strip groove; the first driving unit is located on one side of the second seat portion, and the output shaft of the first driving unit passes through the strip groove and is connected to the first gear.

[0019] In some embodiments, the connecting rod is rotatably disposed on the support base through a rotating shaft assembly, spanning the first seat and the second seat; the gear transmission unit is positioned on the first seat and is connected to the transmission rack; the unlocking power mechanism is positioned by a support and supported on the first seat.

[0020] In some embodiments, a vertically arranged guide rail is provided on the first seat portion, and the transmission rack is fitted in the guide rail and can move up and down along the guide rail.

[0021] In some embodiments, the remote unlocking device further includes a connecting base mounted on the pillar; and the unlocking power mechanism is detachably mounted on the connecting base.

[0022] The remote unlocking device of the utility model is coordinated between the inspection basket and the inspection lifting platform. Through the cooperation of the unlocking power mechanism, the unlocking transmission mechanism and the platform lifting mechanism, the unlocking power mechanism can drive the unlocking gear of the unlocking transmission mechanism to disengage the gear of the platform lifting mechanism, thereby disconnecting the engagement between the platform lifting mechanism and the side gear on the inspection basket, achieving the unlocking purpose, so that the inspection lifting platform can be lifted up by external force to remove the inspection basket; the unlocking operation is convenient.

[0023] The utility model is suitable for remote unlocking of a vertical lifting mechanism equipped with a brake in the field of nuclear power fuel detection under abnormal working conditions, thereby enhancing the safety and redundancy of equipment use. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0025] Figure 1 This is a schematic structural diagram of a remote unlocking device according to an embodiment of the present invention;

[0026] Figure 2 yes Figure 1 The schematic diagram of the structure of the remote unlocking device shown is excluding the supporting base and other parts;

[0027] Figure 3 yes Figure 1 Schematic diagram of the resulting support base in the remote release device shown. DETAILED DESCRIPTION

[0028] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation methods of the present invention are now described in detail with reference to the accompanying drawings.

[0029] The remote unlocking device of the fuel assembly inspection lifting platform of the present invention is cooperated between the inspection basket and the inspection lifting platform. With the assistance of the clamping installation component (not shown), the inspection lifting platform can be locked to the outside of the inspection basket, driving the inspection lifting platform to move up and down along the inspection basket, or driving the inspection lifting platform to release the lock with the inspection basket so that it can rise freely and leave the inspection basket.

[0030] like Figure 1 and Figure 2 As shown, the remote unlocking device of the fuel assembly inspection lifting platform according to an embodiment of the present invention may include an unlocking power mechanism 100 , an unlocking transmission mechanism 200 and a platform lifting mechanism 300 .

[0031] Among them, the platform lifting mechanism 300 is used to engage with the side rack 500 of the inspection basket, the unlocking transmission mechanism 200 is used to be connected to the platform lifting mechanism 300, and the unlocking power mechanism 100 serves as a power source, providing power and transmitting it through the unlocking transmission mechanism 200.

[0032] The platform lifting mechanism 300 further includes a first drive unit 31, a first gear 32, and a second gear 33. The first gear 32 is coaxially mounted on the output shaft of the first drive unit 31 and rotates with the output shaft. The second gear 33 is mounted on one side of the inspection basket's side rack 500 and meshes with the side rack 500. The second gear 33 is also spaced apart from the first gear 32 and meshes with the unlocking transmission mechanism 200. When the unlocking transmission mechanism 200 is meshed with the first and second gears 32, the first drive unit 31 is activated, driving the first gear 32 to rotate. The first gear 32 transmits the driving force to the second gear 33 through the unlocking transmission mechanism 200, causing the second gear 33 to move up and down along the side rack 500, thereby driving the entire remote unlocking device and the inspection lifting platform to move up and down along the inspection basket.

[0033] The unlocking transmission mechanism 200 may specifically include an unlocking gear 21, which is configured to mesh with a first gear 32 and a second gear 33. Specifically, when the unlocking gear 21 is meshed with the first gear 32 and the second gear 33, the first drive unit 31 is activated to rotate the first gear 32, which in turn rotates the unlocking gear 21, which in turn rotates the second gear 33 via the unlocking gear 21, causing the second gear 33 to move up and down along the side rack 500.

[0034] In some embodiments, the first gear 32 and the second gear 33 are at the same level, and the unlocking gear 21 is located above the first gear 32 and the second gear 33 .

[0035] Alternatively, the first drive unit 31 includes a motor.

[0036] Furthermore, the unlocking transmission mechanism 200 can move up and down relative to the platform lifting mechanism 300, driving the unlocking gear 21 toward or away from the first gear 32 and the second gear 33. When the unlocking gear 21 approaches to engage the first gear 32 and the second gear 33, the entire remote unlocking device engages with the side rack 500 of the inspection basket, locking the inspection basket. After the unlocking gear 21 moves away to break the mesh with the first gear 32 and the second gear 33, the lock is released, and the second gear 33 can freely rotate along the meshed side rack 500. The entire remote unlocking device can then be hoisted and removed from the inspection basket under external force.

[0037] The unlocking transmission mechanism 200 may further include a connecting rod 22, a transmission rack 23, and a gear transmission unit. The connecting rod 22 is horizontally disposed between the platform lifting mechanism 300 and the unlocking power mechanism 100. The connecting rod 22 has opposing first and second ends. The unlocking gear 21 is rotatably disposed on the second end of the connecting rod 22, which is closer to the platform lifting mechanism 300. The transmission rack 23 is vertically disposed on the first end of the connecting rod 22, which is farther from the platform lifting mechanism 300, and meshes with the gear transmission unit.

[0038] The gear transmission unit is in transmission connection with the unlocking mechanism 100. After the unlocking mechanism 100 is activated, the gear rotation unit rotates and can move along the transmission rack 23. Since the gear transmission unit and the unlocking mechanism 100 are vertically stationary, the gear rotation unit rotates along the transmission rack 23 with which it meshes, driving the transmission rack 23 to move up and down. The transmission rack 23 simultaneously drives the first end of the connecting rod 22 on which it is located to move up and down, thereby driving the unlocking gear 21 on the second end of the connecting rod 22 to move up and down. When the first end of the connecting rod 22 moves downward, its second end moves upward.

[0039] In some embodiments, the first end of the connecting rod 22 is provided with a positioning slot 221, into which one end of the transmission rack 23 engages and is fixed. The unlocking gear 21 is located on the side of the second end of the connecting rod 22 facing the first drive unit 31 and is rotatably connected to the second end of the connecting rod 22 via a rotating shaft. Under external force, the unlocking gear 21 can rotate relative to the connecting rod 22.

[0040] In some embodiments, the gear transmission unit includes a worm 24 and a worm wheel 25 meshing with the worm 24. The worm 24 is configured to be in driving connection with the unlocking mechanism 100, and the worm wheel 25 is configured to be in driving connection with the transmission rack 23, thereby transmitting the power of the unlocking mechanism 100 to the transmission rack 23, driving the transmission rack 23 to move up and down.

[0041] The unlocking power mechanism 100 is connected to the unlocking transmission mechanism 200 , driving the unlocking transmission mechanism 200 to move, and driving the unlocking gear 21 to move closer to engage with the first gear 32 and the second gear 33 , or move away to disconnect the engagement with the first gear 32 and the second gear 33 .

[0042] The unlocking power mechanism 100 may include a second drive unit 11 and a third gear 12 disposed on an output shaft of the second drive unit 11. The second drive unit 11 is connected to a control terminal to enable remote control of the second drive unit 11. Alternatively, the second drive unit 11 includes a motor.

[0043] The third gear 12 is used for transmission connection with the gear transmission unit. To this end, the gear transmission unit also includes a fourth gear 26 meshing with the third gear 12. The worm 24 is coaxially arranged with the fourth gear 26. When the fourth gear 26 rotates, the worm 24 rotates with the fourth gear 26.

[0044] The worm gear 25 rotates with the worm 24. To transmit power to the transmission rack 23, the gear transmission unit further includes a fifth gear 27 coaxially arranged with the worm gear 25. The fifth gear 27 is able to rotate with the worm gear 25. The fifth gear 27 meshes with the transmission rack 23. When the fifth gear 27 rotates, it can drive the transmission rack 23 meshed with it to move up and down.

[0045] Specifically, refer to Figure 2 In the illustrated embodiment, the fifth gear 27 is sleeved on a central shaft 28. The worm gear 25 is also sleeved on the central shaft 28 with the fifth gear 27 spaced apart. The central shaft 28 is fixed relative to the fifth gear 27 and the worm gear 25. The worm gear 25 is positioned below and meshes with the worm 24, while the fifth gear 27 is positioned on one side of the transmission rack 23 and meshes with the transmission rack 23.

[0046] In some embodiments, the remote unlocking device further includes a support base 400 ; the unlocking power mechanism 100 , the unlocking transmission mechanism 200 and the platform lifting mechanism 300 are all disposed on the support base 400 .

[0047] Combine Figure 1-Figure 3The support base 400 may structurally include a first seat portion 41 and a second seat portion 42, which are vertically connected to each other on a horizontal plane to form a T-shaped base. The connecting rod 22 is rotatably mounted on the support base 400 via a rotating shaft assembly 46. The rotating shaft assembly 46 may specifically include a connecting seat and a rotating shaft. The connecting seat is vertically fixed to the support base 400, and the rotating shaft extends between the connecting seat and the connecting rod 22, allowing the connecting rod 22 to rotate about the rotating shaft. The rotating shaft assembly 46 is preferably connected to the middle of the connecting rod 22.

[0048] On the support base 400, the connecting rod 22 spans the first seat 41 and the second seat 42. The second end of the connecting rod 22 is located on the second seat 42, and the first end of the connecting rod 22 is located on the first seat 41. The second seat 42 defines a strip groove 421, into which the first gear 32 and the second gear 33 fit. The first gear 32 and the second gear 33 are connected to the second seat 42 via shafts, respectively, so that the first gear 32 and the second gear 33 can rotate relative to the second seat 42 within the strip groove 421.

[0049] The first driving unit 31 of the platform lifting mechanism 300 is located at one side of the second seat 42 . The output shaft of the first driving unit 31 passes through the strip groove 421 and is connected to the first gear 32 .

[0050] The gear transmission unit of the unlocking transmission mechanism 200 is positioned on the first seat 41 and is in transmission connection with the transmission rack 23 ; the unlocking power mechanism 100 is positioned and supported on the first seat 41 by the support 43 .

[0051] In some embodiments, a vertical guide rail 44 is provided on the first seat 41 , and the transmission rack 23 fits in the guide rail 44 and can move up and down along the guide rail 44 .

[0052] The remote unlocking device may further include a connecting base 45 mounted on the support column 43; the unlocking power mechanism 100 may be detachably mounted on the connecting base 45. When checking that the lifting platform is in normal use (unlocking is not required), the unlocking power mechanism 100 may not be mounted on the connecting base 45.

[0053] In order to facilitate the alignment and disassembly of the unlocking power mechanism 100 on the connecting base 45, at least one positioning column 451 is provided on the connecting base 45, and at least one positioning hole 13 is provided at the bottom of the unlocking power mechanism 100. The positioning column 451 is inserted through the positioning hole 13 to realize the positioning of the unlocking power mechanism 100 on the connecting base 45.

[0054] During use of the remote unlocking device for the fuel assembly inspection and lifting platform of the present invention, when the inspection and lifting platform needs to be remotely unlocked, the second drive unit 11 is activated and drives the third gear 12 to rotate. The third gear 12 drives the worm 24, which in turn drives the worm wheel 25, which in turn drives the fifth gear 27, thereby driving the transmission rack 23 downward. The transmission rack 23 raises the unlocking gear 21 via the connecting rod 22. At this time, the unlocking gear 21 is disengaged from the first gear 32 and the second gear 33, allowing the second gear 33 to rotate freely, thus unlocking the first gear 32 and the second gear 33 at the first drive unit 31. In this state, the inspection and lifting platform can be hoisted and removed from the inspection basket by external force.

[0055] During normal operation of the inspection and lifting platform, the first gear 32, the second gear 33, and the unlocking gear 21 are in meshing engagement. By adjusting the number of rotations of the fourth gear 26, the meshing between gears 4, 5, and 6 is maintained. The first drive unit 31 rotates the first gear 32, which in turn rotates the unlocking gear 21. The unlocking gear 21 then rotates the second gear 33, which in turn rotates on the side rack 500, thereby raising and lowering the entire inspection and lifting platform and the remote unlocking device on the side rack 500. Simultaneously, the reaction force generated by the rotation of the second gear 33 is offset by the opposing self-locking forces of the connecting rod 22, the worm gear 25, and the worm 24, ensuring the stability of the transmission system.

[0056] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A remote unlocking device for a fuel assembly inspection lifting platform, characterized in that: Fitted between the inspection basket and the inspection lifting platform, the remote unlocking device includes an unlocking power mechanism, an unlocking transmission mechanism, and a platform lifting mechanism; The platform lifting mechanism includes a first drive unit, a first gear provided on the output shaft of the first drive unit, and a second gear meshing with a side rack of the inspection basket and spaced apart from the first gear; the unlocking transmission mechanism includes an unlocking gear, the unlocking gear being configured to mesh with the first gear and the second gear respectively; The unlocking power mechanism is connected to the unlocking transmission mechanism, driving the unlocking transmission mechanism to move, and driving the unlocking gear to move closer to engage with the first gear and the second gear, or move away to disconnect the engagement with the first gear and the second gear.

2. The remote unlocking device for the fuel assembly inspection lifting platform according to claim 1, characterized in that: The first gear and the second gear are at the same level, and the unlocking gear is located above the first gear and the second gear.

3. The remote unlocking device for the fuel assembly inspection lifting platform according to claim 1, characterized in that: The unlocking transmission mechanism further includes a gear transmission unit, a transmission rack and a connecting rod; The gear transmission unit is in transmission connection with the unlocking power mechanism, the connecting rod extends horizontally and is rotatably arranged between the platform lifting mechanism and the unlocking power mechanism, the transmission rack is vertically arranged on the first end of the connecting rod and meshes with the gear transmission unit, and the unlocking gear is rotatably arranged on the second end of the connecting rod.

4. The remote unlocking device for the fuel assembly inspection lifting platform according to claim 3, characterized in that: The unlocking power mechanism includes a second driving unit and a third gear arranged on the output shaft of the second driving unit; The gear transmission unit includes a fourth gear meshed with the third gear, a worm coaxially arranged with the fourth gear, a worm wheel meshed with the worm, and a fifth gear coaxially arranged with the worm wheel; the fifth gear meshes with the transmission rack, and the fifth gear can drive the transmission rack meshed with it to move up and down when it rotates.

5. The remote unlocking device for the fuel assembly inspection lifting platform according to claim 4, characterized in that: A positioning groove is provided at the first end of the connecting rod, and one end of the transmission rack is fitted into and fixed in the positioning groove; The unlocking gear is located on a side of the second end of the connecting rod facing the first driving unit and is rotatably connected to the second end of the connecting rod.

6. The remote unlocking device for the fuel assembly inspection lifting platform according to any one of claims 3 to 5, characterized in that: The remote unlocking device further comprises a support base; the unlocking power mechanism, the unlocking transmission mechanism and the platform lifting mechanism are all arranged on the support base.

7. The remote unlocking device for the fuel assembly inspection lifting platform according to claim 6, characterized in that: The support base includes a first seat portion and a second seat portion, wherein the first seat portion and the second seat portion are vertically connected to each other on a horizontal plane to form a T-shaped base; The second seat portion defines a strip groove, and the first gear and the second gear fit into the strip groove; the first driving unit is located on one side of the second seat portion, and the output shaft of the first driving unit passes through the strip groove and is connected to the first gear.

8. The remote unlocking device for the fuel assembly inspection lifting platform according to claim 7, characterized in that: The connecting rod is rotatably arranged on the support base through a rotating shaft assembly, spanning the first seat and the second seat; the gear transmission unit is positioned on the first seat and is connected to the transmission rack; the unlocking power mechanism is positioned by a support and supported on the first seat.

9. The remote unlocking device for the fuel assembly inspection lifting platform according to claim 8, characterized in that: A vertically arranged guide rail is provided on the first seat portion, and the transmission rack is fitted in the guide rail and can move up and down along the guide rail.

10. The remote unlocking device for the fuel assembly inspection lifting platform according to claim 8, characterized in that: The remote unlocking device further comprises a connecting base mounted on the pillar; the unlocking power mechanism is detachably mounted on the connecting base.

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