Outer door hand wheel mechanism of personnel gate and personnel gate device for nuclear power plant

Abstract

The application discloses an outer door hand wheel mechanism of a personnel gate and a personnel gate device for a nuclear power station. The outer door hand wheel mechanism comprises a hand wheel disc, a hand wheel shaft, a box, a first locking assembly and a second locking assembly. A channel is formed in the box, and a transmission assembly of the personnel gate is arranged in the box. The tail end of the hand wheel shaft extends into the channel, and a meshing part is arranged on the tail end and used for meshing with the transmission assembly of the personnel gate. The head end of the hand wheel shaft is installed in the center hole of the hand wheel disc. The first locking assembly is used for locking the hand wheel shaft to prevent the hand wheel shaft from rotating. The second locking assembly is used for locking the hand wheel shaft at a preset position where the meshing part cannot mesh with the transmission assembly of the personnel gate. When the first locking assembly and the second locking assembly are unlocked, the hand wheel shaft can mesh with the transmission assembly of the personnel gate. The hand wheel disc is rotated, so that the hand wheel shaft and the transmission assembly of the personnel gate are driven to rotate, and the personnel valve can be opened and closed. The hand wheel mechanism has high use standardization and safety.

Description

Technical Field

[0001] The present invention specifically relates to an outer door handwheel mechanism for a personnel gate and a personnel gate device for a nuclear power plant including the outer door handwheel mechanism of the personnel gate. Background Technology

[0002] Personnel gates in nuclear power plants are important penetrations on the reactor containment structure, belonging to the pressure boundary of the containment. They should have the following functions: 1. During the construction and refueling of the nuclear power plant, personnel gates should be able to be easily opened and closed, serving as the entrance and exit channels for personnel and small and medium-sized equipment in the reactor building, while also accommodating equipment installation and maintenance; 2. During normal reactor operation or hot shutdown, personnel and small and medium-sized equipment should be able to enter and exit the containment building while the containment structure is sealed; 3. In the event of an accident, personnel should serve as an emergency evacuation exit from the containment structure.

[0003] Under normal circumstances, the personnel gate can be automatically opened or closed by the control system. However, in the event of a power failure, the personnel gate can only be opened and closed by handwheel. This provides a manual torque input mechanism for the personnel gate, which can open and close the personnel gate in the event of a power failure while maintaining structural integrity and sealing.

[0004] In existing technologies, handwheel mechanisms typically lack control devices, allowing operators or unauthorized personnel to open personnel gates without authorization. This is detrimental to the standardization of nuclear power plant operations and poses a safety risk. Secondly, excessive torque applied by operators can damage the gate's transmission components or cause injury due to the handwheel's rebound. Thirdly, existing handwheel mechanisms are usually directly connected to the gate's transmission system and cannot be separated. They need to be disassembled when not in use and reinstalled when needed, hindering convenient operation. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to address the above-mentioned deficiencies in the prior art by providing an outer door handwheel mechanism for a personnel gate and a personnel gate device for a nuclear power plant including the outer door handwheel mechanism of the personnel gate. The outer door handwheel mechanism of the personnel gate is provided with a locking component and a torque limiting component, which effectively improves its standardization and safety.

[0006] To solve the above problems, the present invention adopts the following technical solution:

[0007] An external door handwheel mechanism for a personnel gate includes a handwheel disc, a handwheel shaft, a housing, a first locking component, and a second locking component. The housing has a channel, and the transmission component of the personnel gate is located within the housing and positioned on one side of the channel. The tail end of the handwheel shaft extends into the channel, and a meshing component is provided on the tail end for engaging with the transmission component of the personnel gate. The head end of the handwheel shaft is installed in the central hole of the handwheel disc. The first locking component locks the handwheel shaft to prevent it from rotating. The second locking component locks the handwheel shaft at a preset position where the meshing component cannot engage with the transmission component of the personnel gate. When the first locking component is unlocked, the handwheel shaft rotates to unlock the second locking component, and under the push of the handwheel disc, moves along the channel to engage the meshing component on the tail end of the handwheel shaft with the transmission component of the personnel gate. By rotating the handwheel disc, the handwheel shaft and the transmission component of the personnel gate are driven to rotate, thereby opening or closing the valve.

[0008] Preferably, the first locking assembly includes a lock and a key. The lock is mounted on the head end of the handwheel shaft. By inserting the key into the lock and turning it, the first locking assembly is unlocked, allowing the handwheel to drive the handwheel shaft to rotate.

[0009] Preferably, the second locking assembly includes a sleeve and a steel ball. The handwheel shaft is hollow inside, and the sleeve is fixed inside the handwheel shaft. The inner walls on both sides of the channel are provided with a first groove, and correspondingly, the outer walls on both sides of the handwheel shaft are provided with a second groove. The first groove and the second groove are connected and form a storage groove when they are aligned. The steel ball is placed in the storage groove, and the diameter of the steel ball is greater than the depth of the first groove and the second groove. The sleeve is provided with a through hole. The rotation of the handwheel shaft drives the sleeve to rotate so that the position of the through hole corresponds to the storage groove, thereby allowing the steel ball to enter the sleeve through the through hole, thereby releasing the locking of the handwheel shaft by the second locking assembly.

[0010] Preferably, the first end of the sleeve extends from the first end of the handwheel shaft, and the lock is disposed on the first end of the sleeve.

[0011] Preferably, the outer door handwheel mechanism further includes a torque limiting component, which includes an elastic unit. The handwheel disc includes a bottom cover and a top cover, and the interior of the bottom cover and top cover after being assembled forms a cavity. The center hole of the handwheel disc is located at the center of the cavity, and the portion of the handwheel shaft housed in the cavity is provided with an annular protrusion. The elastic unit is disposed in the cavity, and the cross-section of the elastic unit is I-shaped. The elastic unit is in a compressed state and is sleeved on the annular protrusion. Its two end faces abut against the bottom cover and the top cover, respectively. There is a maximum static friction torque between the annular protrusion of the handwheel shaft and the elastic unit. When the rotational torque of the handwheel disc is greater than the maximum static friction torque, the handwheel disc slips against the handwheel shaft.

[0012] Preferably, the elastic unit includes a spring, a spring sleeve, and a spring resistance washer. The spring sleeve is I-shaped with a hollow center. The spring sleeve is fitted over the annular protrusion of the handwheel shaft. The spring is disposed inside the spring sleeve. The spring resistance washer is disposed between the spring sleeve and the bottom cover, and between the spring sleeve and the top cover.

[0013] Preferably, the maximum static friction torque ranges from 50 to 70 Nm.

[0014] Preferably, the handwheel further includes a handle shaft and a handwheel handle, the handle shaft is mounted on the bottom cover of the handwheel, the handwheel handle is connected to the handle shaft, and the axis of the handle shaft is perpendicular to the surface of the handwheel.

[0015] Preferably, the bottom cover of the handwheel disc is provided with a third groove, the fixed end of the handwheel handle is hinged in the third groove, and the free end of the handwheel handle can rotate around the fixed end of the handwheel handle, thereby being stored in the third groove.

[0016] The present invention also provides a personnel gate device for a nuclear power plant, comprising a personnel gate and a control part for the personnel gate, wherein the control part of the personnel gate includes the aforementioned outer door handwheel mechanism of the personnel gate.

[0017] The external door handwheel mechanism of the personnel gate in this invention, by setting a first locking component and a second locking component, ensures that the handwheel mechanism can only be operated when a key is possessed. Furthermore, a safety torque is provided between the handwheel shaft and the handwheel disc. When the operator's torque in turning the handwheel disc exceeds the safety torque, the handwheel disc will slip against the handwheel shaft, thereby protecting the personnel gate equipment and preventing the handwheel from rebounding and causing injury to the operator. This improves the standardization and safety of the handwheel mechanism's use. In addition, when not in use, the handwheel mechanism can be simply separated from the transmission components of the personnel gate, eliminating the need for repeated disassembly and installation, greatly improving ease of use. Attached Figure Description

[0018] Figure 1 This is a top cross-sectional view of the outer door handwheel of the personnel gate in Embodiment 1 of the present invention;

[0019] Figure 2 yes Figure 1 The HH view in the middle.

[0020] In the diagram: 1-Handwheel disc, 2-Handle shaft, 3-Handwheel handle, 4-Compression spring, 5-First washer, 7-Steel ball, 8-Lock cylinder, 9-Cylindrical pin, 10-Spring resistance washer, 11-Spring sleeve, 12-Spring, 13-Handwheel shaft sleeve, 14-Lock head, 15-Sleeve, 16-Sealing cover, 17-Handwheel shaft, 19-Box block, 20-End cover, 21-Special shaped nut, 22-Drive shaft, 23-Gear washer, 24-Second bevel gear, 25-First bevel gear, 26-Second washer, 27-Bolt, 28-Angular contact ball bearing, 29-Compression bolt, 30-Small diameter section, 31-Large diameter section. Detailed Implementation

[0021] The technical solutions of the invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without creative effort are within the scope of the invention.

[0022] In the description of this invention, it should be noted that the terms "above" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience and simplification of the description and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0023] In the description of this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection," "setting," "installation," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] This invention provides an outer door handwheel mechanism for a personnel gate, comprising a handwheel disc, a handwheel shaft, a housing, a first locking component, and a second locking component. The housing has a channel, and the transmission component of the personnel gate is located within the housing and positioned on one side of the channel. The tail end of the handwheel shaft extends into the channel, and a meshing component is provided on the tail end for engaging with the transmission component of the personnel gate. The head end of the handwheel shaft is installed in the central hole of the handwheel disc. The first locking component locks the handwheel shaft to prevent it from rotating. The second locking component locks the handwheel shaft at a preset position where the meshing component cannot engage with the transmission component of the personnel gate. When the first locking component is unlocked, the handwheel shaft rotates to unlock the second locking component, and under the push of the handwheel disc, moves along the channel to engage the meshing component on the tail end of the handwheel shaft with the transmission component of the personnel gate. By rotating the handwheel disc, the handwheel shaft and the transmission component of the personnel gate are driven to rotate, thereby opening or closing the valve.

[0026] The present invention also provides a personnel gate device for a nuclear power plant, comprising a personnel gate and a control part for the personnel gate, wherein the control part of the personnel gate includes the aforementioned outer door handwheel mechanism of the personnel gate.

[0027] Example 1

[0028] like Figure 1 As shown, this embodiment discloses an outer door handwheel mechanism for a personnel gate, including a handwheel disc 1, a handwheel shaft 17, a housing, a first locking assembly, and a second locking assembly. A channel is provided inside the housing, located at the center of the housing. The transmission assembly of the personnel gate is located inside the housing and situated on one side of the channel. The tail end of the handwheel shaft 17 extends into the channel and has a meshing component for engaging with the transmission assembly of the personnel gate. The head end of the handwheel shaft 17 is installed in the central hole of the handwheel disc 1. The first locking assembly is used to lock the handwheel shaft 17. 7. To prevent the handwheel shaft 17 from rotating, the second locking assembly is used to lock the handwheel shaft 17 in a preset position where the engaging part cannot engage with the transmission assembly of the personnel gate. When the first locking assembly is unlocked, the handwheel shaft 17 rotates to unlock the second locking assembly and moves along the channel under the push of the handwheel disc 1 so that the engaging part on the tail end of the handwheel shaft 17 engages with the transmission assembly of the personnel gate. By rotating the handwheel disc 1, the handwheel shaft 17 and the transmission assembly of the personnel valve are driven to rotate, thereby enabling the valve to be opened or closed.

[0029] In this embodiment, the channel is a straight channel.

[0030] In this embodiment, the handwheel 1 is disc-shaped, and the diameter of its central hole is slightly larger than the diameter of the handwheel shaft 17, so that the handwheel shaft 17 can fit into the central hole of the handwheel 1. The axis of the handwheel shaft 17 is perpendicular to the disc surface of the handwheel 1.

[0031] In this embodiment, the first locking assembly includes a lock and a key. The lock is mounted on the head end of the handwheel shaft 17 and has a keyhole. It can only be unlocked by a key that is compatible with it. By inserting the key into the lock and turning it, the first locking assembly can be unlocked, causing the handwheel 1 to drive the handwheel shaft 17 to rotate.

[0032] In this embodiment, the second locking assembly includes a sleeve 15 and a steel ball 7. When the second locking assembly is locked, the handwheel shaft 17 cannot move back and forth along the channel. The handwheel shaft 17 is hollow inside, and the sleeve 15 is fixed inside the handwheel shaft 17 (one end of which is fixedly connected to the lock). First grooves are provided on the inner walls of both sides of the channel, and correspondingly, second grooves are provided on the outer walls of both sides of the handwheel shaft 17. The first and second grooves are connected and form a storage groove when aligned. The steel ball 7 is placed in the storage groove (at which time the handwheel shaft 17 is in a preset position), and the diameter of the steel ball 7 is greater than the depth of the first and second grooves (i.e., the diameter of the steel ball is greater than the depth of either of them, and the steel ball is precisely accommodated in the first and second grooves). Inside the formed storage tank, a through hole is provided at the same height as the storage tank on the sleeve 15 (when the first locking component is locked, the axis of the through hole forms a 90° angle with the straight line between the two steel balls 7). When the first locking component is unlocked, the lock rotates and drives the sleeve 15 to rotate by a rotation angle of 90°, so that the position of the through hole corresponds to the position of the storage tank, thereby allowing the steel balls 7 to enter the sleeve 15 through the through hole, so as to release the locking of the handwheel shaft 17 by the second locking component. The handwheel shaft 17 can then slide along the channel and engage with the transmission component of the personnel gate.

[0033] Specifically, in this embodiment, the first end of the sleeve 15 extends from the first end of the handwheel shaft 17, the lock is set on the first end of the sleeve 15, and the first end of the handwheel shaft 17 is flush with the outer end face of the handwheel disc 1, and the lock is set on the side of the handwheel disc 1 away from the housing.

[0034] The lock includes a lock head 14 and a lock cylinder 8. The lock head 14 is located inside the handwheel shaft 17, with one end fixedly connected to the sleeve 15. The other end of the lock head 14 is provided with the lock cylinder 8, which extends out of the handwheel shaft 17. The lock head 14 is fixedly connected to the handwheel shaft 17 by a cylindrical pin 9.

[0035] like Figure 1As shown, the outer door handwheel mechanism also includes a torque limiting component, which includes an elastic unit. The handwheel disc 1 includes a bottom cover and a top cover, which together form a cavity. The two are connected by a clamping bolt 29, and a first washer 5 is placed between them. The center hole of the handwheel disc 1 is located at the center of the cavity, and the part of the handwheel shaft 17 housed in the cavity has an annular protrusion. The elastic unit is located inside the cavity, and the cross-section of the elastic unit is I-shaped. The elastic unit is in a compressed state and is fitted onto the annular protrusion. Outside the protrusion, its two end faces abut against the bottom cover and the top cover respectively. The annular protrusion of the handwheel shaft 17 has the maximum static friction torque between it and the elastic unit. When the rotational torque of the handwheel disc 1 is greater than the maximum static friction torque (the maximum static friction between the annular protrusion of the handwheel shaft 17 and the elastic unit is determined by the clamping force of the clamping bolt 29), the handwheel disc 1 slips between it and the handwheel shaft 17, thereby effectively preventing damage to the personnel gate equipment when the operator's rotational torque is too large and preventing the handwheel rebound from causing injury to the operator.

[0036] In this embodiment, two elastic units are provided, respectively fitted onto the annular protrusions on both sides of the handwheel shaft 17. The elastic unit includes a spring 12, a spring sleeve 11, and a spring resistance washer 10. The cross-section of the spring sleeve 11 is I-shaped with a hollow center. The spring sleeve 11 is fitted onto the annular protrusion of the handwheel shaft 17. The spring 12 is disposed inside the spring sleeve 11. The spring resistance washer 10 is disposed between the spring sleeve 11 and the bottom cover and between the spring sleeve 11 and the top cover. The spring 12 is always in a compressed state, thereby maintaining friction between the contact surfaces of the handwheel shaft 17 and the elastic unit. When the handwheel 1 rotates, the friction between the handwheel shaft 17 and the elastic unit drives the handwheel shaft 17 to rotate. When the torque applied by the operator is greater than the torque of the maximum static friction between the handwheel shaft 17 and the elastic unit, the handwheel shaft 17 will slip between the handwheel 1 and the handwheel 1.

[0037] Specifically, the maximum static friction torque ranges from 50 to 70 Nm.

[0038] In this embodiment, the meshing component on the handwheel shaft 17 and the transmission assembly of the personnel valve are in clearance fit. The handwheel disk 1 also includes a handle shaft 2 and a handwheel handle 3. The handle shaft 2 is mounted on the bottom cover of the handwheel disk 1, and the handwheel handle 3 is connected to the handle shaft 2. The axis of the handle shaft 2 is perpendicular to the disk surface of the handwheel disk 1.

[0039] In this embodiment, the bottom cover of the handwheel 1 is provided with a third groove on the side away from the box body. The fixed end of the handwheel handle 3 is hinged to one end in the third groove. The free end of the handwheel handle 3 can rotate around the fixed end of the handwheel handle 3, so as to be stored in the third groove or rotated to the operating position (the axis of the handle shaft 2 is perpendicular to the disk surface of the handwheel 1).

[0040] Specifically, the handle shaft 2 is cylindrical, and the handwheel handle 3 has a mounting hole along its axial direction. The mounting hole is stepped, with a small-diameter section 30 near the opening. The diameter of the small-diameter section 30 matches the diameter of the handle shaft 2. The handle shaft 2 is installed in the small-diameter section 30 of the mounting hole. The section of the mounting hole away from the opening is a large-diameter section 31. The diameter of the large-diameter section 31 is larger than the diameter of the small-diameter section 30, and the large-diameter section 31 extends from the middle of the mounting hole to the end of the mounting hole. The junction of the large-diameter section 31 and the small-diameter section 30 forms a stepped surface. A compression spring 4 is also provided in the mounting hole. The two ends of the compression spring 4 abut against the stepped surface and the end of the mounting hole, respectively, so that when the handwheel handle 3 is stored in the third groove, the handwheel handle 3 is compressed and firmly fixed in the third groove.

[0041] like Figure 1 , 2 As shown, the transmission assembly of the personnel valve includes a first bevel gear 25, a second bevel gear 24, and a transmission shaft 22. The first bevel gear 25 is located at the end of the channel, aligned with the handwheel shaft 17. The wheel surface of the first bevel gear 25 is perpendicular to the channel, and a hexagonal connecting block is provided at the center of the wheel surface. Correspondingly, the end of the handwheel shaft 17 connected to the transmission assembly of the personnel gate has a matching hexagonal groove. When the handwheel shaft 17 is unlocked along its axial direction, it moves linearly along the channel, allowing the hexagonal groove to engage with the hexagonal connecting block. Since the second bevel gear 24 engages with the first bevel gear 25 and is perpendicular to it, and is mounted on the transmission shaft 22, the handwheel shaft 17 drives the first bevel gear 25 to rotate, which in turn drives the second bevel gear 24 to rotate, and further drives the transmission shaft 22 to rotate. The transmission shaft 22 is connected to the personnel gate, ultimately controlling the opening and closing of the personnel valve.

[0042] In this embodiment, a sealing cover 16 is provided inside the housing, and the aforementioned channel is formed inside the sealing cover 16. The handwheel shaft 17 is disposed in the channel, and the first groove is formed on the inner wall of the sealing cover 16. In addition, the outer door handwheel mechanism also includes a handwheel bushing 13, which is disposed in the cavity formed by the bottom cover and the top cover of the handwheel disc 1, and is sleeved on the handwheel shaft 17. An elastic unit is disposed inside the handwheel bushing 13.

[0043] like Figure 2As shown, the housing includes a housing block 19 and an end cover 20. The end cover 20 and the housing block 19 are connected by bolts 27, and a second washer 26 is provided at the connection position between the housing block 19 and the end cover 20. The drive shaft 22 is installed in the housing through an angular contact ball bearing 28. The second bevel gear 24 is sleeved on the end of the drive shaft and fixed by a special nut 21. The special nut 21 abuts against the outer wall of the handwheel shaft 17. A gear washer 23 is provided between the special nut 21 and the second bevel gear 24.

[0044] The working process of the outer door handwheel mechanism of the personnel gate in this embodiment is as follows:

[0045] The first locking assembly is unlocked with a key (the key is kept by a designated department and can be requested by the operator when needed), which rotates the sleeve 15 by 90° so that the through hole on the sleeve 15 connects with the storage tank. The steel ball 7, which is placed in the storage tank, enters the through hole, thereby unlocking the second locking assembly. The handwheel shaft 17 is released from its restriction to move linearly along the channel. The operator pushes the handwheel disc 1, thereby pushing the handwheel shaft 17 to move linearly along the channel, which in turn causes the hexagonal connecting block on the first bevel gear 25 to connect with the handwheel. The hexagonal groove on the shaft 17 connects to the handwheel shaft 17, which drives the first bevel gear 25 to rotate, thereby driving the second bevel gear 24 and the transmission shaft 22 to rotate. The transmission shaft 22 is connected to the personnel gate, thereby controlling the opening and closing of the personnel valve. When it is not necessary to rotate the handwheel 1, the handle shaft 2 can be stored in the third groove. Furthermore, when the rotational torque of the handwheel 1 exceeds the maximum static friction torque, the handwheel 1 will slip against the handwheel shaft 17, thereby protecting the personnel gate equipment and preventing the handwheel from rebounding and causing injury to the operator.

[0046] In this embodiment, the outer door handwheel mechanism is equipped with a first locking component and a second locking component. The handwheel mechanism can only be operated when the key is available. A safety torque is provided between the handwheel shaft 17 and the handwheel disc 1. When the torque exerted by the operator on the handwheel disc 1 exceeds the safety torque, the handwheel disc 1 will slip against the handwheel shaft 17, thereby protecting the personnel gate equipment and preventing the handwheel from rebounding and causing injury to the operator. This improves the standardization and safety of the handwheel mechanism. In addition, when the handwheel mechanism is not in use, it can be separated from the transmission component of the personnel gate, thus eliminating the need for repeated disassembly and installation, greatly improving ease of use.

[0047] Example 2

[0048] This embodiment discloses a personnel gate device for nuclear power plants, including a personnel gate and a control part for the personnel gate. The control part of the personnel gate includes the outer door handwheel mechanism of the personnel gate in Embodiment 1.

[0049] In this embodiment, the personnel gate is a personnel gate on the containment vessel of a nuclear power plant reactor. As an important penetrating component of the containment vessel, the personnel gate belongs to the pressure-bearing boundary of the containment vessel and serves as a passage for personnel and small to medium-sized equipment. In the event of a power failure, the personnel gate can be manually opened and closed via a handwheel mechanism, which primarily functions as the manual torque input mechanism for the personnel gate. In addition, the handwheel mechanism can also be applied to other mechanical equipment.

[0050] In this embodiment, the personnel gate device can be manually opened or closed by the handwheel mechanism of the personnel gate in the event of a power failure, ensuring the structural integrity and sealing of the personnel gate and protecting the safety of the operators.

[0051] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. An outer door handwheel mechanism for a personnel gate, characterized in that, Includes a handwheel (1), a handwheel shaft (17), a housing, a first locking assembly, and a second locking assembly. The enclosure has a passageway, and the transmission assembly of the personnel gate is located inside the enclosure and on one side of the passageway. The tail end of the handwheel shaft (17) extends into the channel, and a meshing component is provided on the tail end for meshing with the transmission assembly of the personnel gate. The head end of the handwheel shaft (17) is installed in the center hole of the handwheel disc (1). The first locking component is used to lock the handwheel shaft (17) to prevent the handwheel shaft (17) from rotating. The second locking assembly is used to lock the handwheel shaft (17) at a preset position where the engaging component cannot engage with the transmission assembly of the gate. When the first locking component is unlocked, the handwheel shaft (17) rotates to unlock the second locking component, and moves along the channel under the push of the handwheel disc (1) so that the engaging part on the tail end of the handwheel shaft (17) engages with the transmission component of the personnel gate. By rotating the handwheel disc (1), the handwheel shaft (17) and the transmission component of the personnel valve are driven to rotate, thereby enabling the personnel valve to be opened or closed. The second locking assembly includes a sleeve (15) and a steel ball (7). The handwheel shaft (17) is hollow inside, and the sleeve (15) is fixed inside the handwheel shaft (17). The inner walls on both sides of the channel are provided with a first groove, and correspondingly, the outer walls on both sides of the handwheel shaft (17) are provided with a second groove. The first groove and the second groove are connected and form a storage tank when they are aligned. The steel ball (7) is placed in the storage tank, and the diameter of the steel ball (7) is greater than the depth of the first groove and the second groove. The sleeve (15) has a through hole. The handwheel shaft (17) rotates to drive the sleeve (15) to rotate so that the position of the through hole corresponds to the storage tank, thereby allowing the steel ball (7) to enter the sleeve (15) through the through hole, thereby releasing the locking of the handwheel shaft (17) by the second locking assembly.

2. The outer door handwheel mechanism of the personnel gate according to claim 1, characterized in that, The first locking component includes a lock and a key. The lock is mounted on the head end of the handwheel shaft (17). By inserting the key into the lock and turning it, the first locking component is unlocked, so that the handwheel disc (1) can drive the handwheel shaft (17) to rotate.

3. The outer door handwheel mechanism of the personnel gate according to claim 2, characterized in that, The first end of the sleeve (15) extends from the first end of the handwheel shaft (17), and the lock is disposed on the first end of the sleeve (15).

4. The outer door handwheel mechanism of the personnel gate according to any one of claims 1-3, characterized in that, It also includes torque limiting components. The torque limiting component includes an elastic unit. The handwheel (1) includes a bottom cover and a top cover. The bottom cover and the top cover are joined together to form a cavity. The center hole of the handwheel (1) is located at the center of the cavity, and the part of the handwheel shaft (17) that is housed in the cavity is provided with an annular protrusion. The elastic unit is disposed within the cavity, and the cross-section of the elastic unit is I-shaped. The elastic unit is in a compressed state and is fitted over the annular protrusion, with its two end faces abutting against the bottom cover and the top cover, respectively. The annular protrusion of the handwheel shaft (17) has a maximum static friction torque between it and the elastic unit. When the rotational torque of the handwheel disc (1) is greater than the maximum static friction torque, the handwheel disc (1) and the handwheel shaft (17) slip.

5. The outer door handwheel mechanism of the personnel gate according to claim 4, characterized in that, The elastic unit includes a spring (12), a spring sleeve (11), and a spring resistance washer (10). The spring sleeve (11) is I-shaped with a hollow center. The spring sleeve (11) is fitted over the annular protrusion of the handwheel shaft (17). The spring (12) is disposed inside the spring sleeve (11). The spring resistance washer (10) is placed between the spring cup (11) and the bottom cover, and between the spring cup (11) and the top cover.

6. The outer door handwheel mechanism of the personnel gate according to claim 5, characterized in that, The maximum static friction torque ranges from 50 to 70 Nm.

7. The outer door handwheel mechanism of the personnel gate according to claim 1, characterized in that, The handwheel (1) also includes a handle shaft (2) and a handwheel handle (3). The handle shaft (2) is mounted on the bottom cover of the handwheel (1). The handwheel handle (3) is connected to the handle shaft (2), and the axis of the handle shaft (2) is perpendicular to the surface of the handwheel disc (1).

8. The outer door handwheel mechanism of the personnel gate according to claim 7, characterized in that, The bottom cover of the handwheel (1) is provided with a third groove. The fixed end of the handwheel handle (3) is hinged in the third groove, and the free end of the handwheel handle (3) can rotate around the fixed end of the handwheel handle (3) so as to be stored in the third groove.

9. A personnel gate device for a nuclear power plant, comprising a personnel gate and a control unit for the personnel gate, characterized in that, The control part of the personnel gate includes the outer door handwheel mechanism of the personnel gate as described in any one of claims 1-8.

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