Drawer safety locking mechanism of nuclear power switch cabinet

Abstract

The utility model discloses a drawer safety locking mechanism of a nuclear power switch cabinet, and belongs to the field of switch cabinets. Comprising a drawer body and a locking assembly, the locking assembly comprises a rotating shaft installed on a drawer shell through a bearing, the rotating shaft is provided with a first bevel gear, a first supporting plate is installed on the side face of the drawer shell, a second bevel gear is installed on the first supporting plate through a bearing, the second bevel gear is meshed with the first bevel gear, the second bevel gear is in transmission connection with a first lead screw, and the first lead screw is provided with a first buckling part; the auxiliary unit comprises a second supporting plate installed on the side face of the drawer shell, a third bevel gear is installed on the second supporting plate through a bearing, the third bevel gear is in transmission connection with a second lead screw, and the second lead screw is provided with a second buckling part; a buckling groove is formed in the side face of the drawer body. A telescopic rod piece is connected between the second lead screw and the first lead screw. According to the drawer safety locking mechanism of the nuclear power switch cabinet, the first lead screw and the second lead screw are in transmission through the bevel gear, the buckling part is matched with the buckling groove, bidirectional rigid constraint on the drawer body is achieved, and the misoperation risk under the dangerous working condition is avoided.

Description

Technical Field

[0001] This utility model relates to the field of switchgear technology, and in particular to a drawer safety locking mechanism for nuclear power switchgear. Background Technology

[0002] In the complex and high-risk operating environment of nuclear power plants, switchgear, as the core hub of power distribution and control, directly impacts the stable operation of the plant and the safety of personnel and property. Drawer-type switchgear, with its modular design and ease of maintenance, is widely used in nuclear power plant power systems. It achieves effective heat dissipation for internal components through ventilation holes on the cabinet exterior, and uses load-bearing partitions to divide the cabinet into multiple independent distribution compartments. Each compartment's drawer unit can flexibly install electrical components such as circuit breakers and relays. Maintenance personnel can remove the drawer unit by unlocking the drawer locking device according to standardized procedures. The removed drawer unit can then be fully inspected and maintained at a dedicated maintenance station.

[0003] However, in actual operation, when the equipment is in dangerous conditions such as being energized or the grounding switch is not closed, if the drawer is accidentally pulled out, it can easily cause serious accidents such as electric shock and short circuit, and even lead to power system paralysis. Although existing interlocking devices can lock the drawer based on electrical or mechanical logic such as the circuit breaker's open / closed status and the grounding switch position, they are susceptible to failure due to environmental factors (such as mechanical wear and aging of electrical components). Therefore, it is necessary to design a safe locking mechanism for the drawers of nuclear power switchgear.

[0004] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore may include information that does not constitute prior art. Utility Model Content

[0005] This utility model provides a drawer safety locking mechanism for nuclear power switchgear to solve the problem that in actual operation, accidental opening of the drawer in a drawer-type switchgear under energized operating conditions can easily lead to serious accidents, and that existing interlocking devices are at risk of failure due to environmental influences.

[0006] This utility model embodiment adopts the following technical solution: a drawer safety locking mechanism for a nuclear power switchgear. It mainly includes a drawer shell, a drawer body, and a locking assembly. The locking assembly includes a rotating shaft with bearings mounted on the side of the drawer shell. A bevel gear is mounted at one end of the rotating shaft. A first support plate is mounted on the side of the drawer shell. A bevel gear is mounted on the first support plate with bearings. The bevel gear is meshed with the bevel gear. A lead screw is centrally connected to the bevel gear, and a latching part is mounted at one end of the lead screw. An auxiliary unit is mounted on the drawer shell. The auxiliary unit includes a second support plate mounted on the side of the drawer shell. A bevel gear is mounted on the second support plate with bearings. A lead screw is centrally connected to the bevel gear, and a latching part is mounted at one end of the lead screw. A latching groove adapted to the latching part is provided on the side of the drawer body. A telescopic rod connects the lead screw and the lead screw. A driving component suitable for driving the rotating shaft is mounted on the drawer shell.

[0007] Furthermore, there is an axial constraint between the lead screw and the drawer housing, and a bearing is provided on the side of the drawer housing, which is movably sleeved on the lead screw.

[0008] Furthermore, there is an axial constraint between the second lead screw and the drawer housing, and a bearing is provided on the side of the drawer housing and is movably sleeved on the second lead screw.

[0009] Furthermore, the telescopic rod is composed of rod one and rod two that telescopically fit together. The drawer shell and the drawer body have movable grooves on their sides that are adapted to the diameter of the rods. The movable grooves allow the telescopic rod to move freely during the drawer's operation. The telescopic rod has a sliding groove, and rod two has a limiting part installed on it. Rod two slides in the sliding groove through the limiting part.

[0010] Furthermore, the diameter of the telescopic rod is smaller than the diameter of the fastening part, and the fastening groove is connected to the movable groove.

[0011] Furthermore, the contact positions of the second and first fastening parts with the fastening groove are provided with anti-slip protrusions, which are made of silicone.

[0012] The above-mentioned technical solutions adopted in the embodiments of this utility model can achieve the following beneficial effects:

[0013] The safety locking mechanism of the drawer in the nuclear power switchgear uses bevel gears to drive screw 1 and screw 2 respectively. With the matching design of latching part 1, latching part 2 and latching groove, it achieves bidirectional rigid constraint on the drawer body, effectively preventing the equipment from being accidentally pulled out under dangerous conditions such as power-on or grounding switch not being closed, thus avoiding serious accidents such as electric shock and short circuit. The application of telescopic rods ensures that the screws on both sides rotate synchronously during the drawer pulling process, ensuring uniform force and preventing the drawer from tilting or loosening. Attached Figure Description

[0014] The accompanying drawings, which are provided to further illustrate the present invention and constitute a part of the present invention, illustrate exemplary embodiments of the present invention and are used to explain the present invention, but do not constitute an undue limitation of the present invention.

[0015] In the attached diagram:

[0016] Figure 1 This is an overall schematic diagram of the drawer safety locking mechanism of the nuclear power switchgear in this application;

[0017] Figure 2 for Figure 1 Schematic diagram of the outer shell structure of the middle drawer;

[0018] Figure 3 for Figure 1 Schematic diagram of the opening structure of the middle drawer;

[0019] Figure 4 for Figure 3 A partial structural diagram;

[0020] Figure 5 for Figure 4 A schematic diagram of the reverse structure;

[0021] Figure label:

[0022] 1. Drawer outer shell; 11. Support plate; 12. Drawer body; 121. Movable groove; 122. Snap groove; 13. Cabinet door; 14. Handle; 15. Interlocking unit; 16. Display screen; 2. Locking assembly; 21. Rotating shaft; 22. Bevel gear one; 23. First support plate; 24. First protruding end; 25. Bevel gear two; 26. Lead screw one; 27. Snap-fit ​​part one; 28. Telescopic rod; 281. Rod one; 282. Rod two; 283. Sliding groove; 284. Restricting part; 29. ​​Second support plate; 210. Bevel gear three; 211. Lead screw two; 212. Snap-fit ​​part two; 213. Drive component. Detailed Implementation

[0023] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0024] The technical solutions provided by the various embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0025] Reference Figures 1 to 5 As shown, this utility model embodiment provides a drawer safety locking mechanism for a nuclear power switchgear, including a drawer housing 1 and a locking component 2;

[0026] Multiple sets of equally spaced support plates 11 are fixedly installed on the drawer shell 1, and the drawer body 12 is slidably installed on the support plates 11.

[0027] The locking assembly 2 includes a rotating shaft 21 with a bearing mounted on the side of the drawer housing 1. A bevel gear 22 is fixedly mounted on one end of the rotating shaft 21. At the same time, a first support plate 23 is fixedly mounted on the side of the drawer housing 1. The first support plate 23 has a vertically arranged first protruding end 24. A bevel gear 25 is mounted on the side of the first protruding end 24 with a bearing. The bevel gear 25 meshes with the bevel gear 22.

[0028] Furthermore, a lead screw 26 is connected to the center of the bevel gear 25. A fastening part 27 is fixedly installed at one end of the lead screw 26. The fastening part 27 passes through the side of the drawer shell 1. At the same time, a fastening groove 122 that matches the size of the fastening part 27 is provided on the side of the drawer body 12.

[0029] It should be noted that there is an axial constraint between the lead screw 26 and the drawer housing 1 (that is, the axial movement of the drawer housing 1 is restricted by setting a bearing on the side of the drawer housing 1 and movably connecting it to the lead screw 26).

[0030] An external driving force (such as a motor or manual operation) acts on the rotating shaft 21, causing it to rotate around its own axis. Since bevel gear 22 is fixedly connected to the rotating shaft 21, the two rotate synchronously. Through the meshing transmission of the bevel gears, bevel gear 25 is driven to rotate around its own axis (the direction of rotation is perpendicular to the rotating shaft 21), converting the horizontal rotational motion into the vertical rotational motion.

[0031] Since the lead screw 26 is connected to the drawer housing 1 via a bearing, the bearing only allows the lead screw to rotate but restricts its axial movement (i.e., the lead screw cannot move back and forth along its own axis). When the lead screw 26 rotates, the engaging part 27, which is engaged with it, is forced to move linearly along the lead screw axis due to the action of the lead screw's helical groove. Depending on the direction of the lead screw's rotation and the direction of its helix, the engaging part 27 can extend or retract.

[0032] When the rotating shaft 21 rotates clockwise (hypothetically), it drives the lead screw 26 to rotate through the bevel gear pair, causing the engaging part 27 to move towards the drawer body 12. When the engaging part 27 is fully inserted into the latching groove 122 on the side of the drawer body 12, the drawer outer shell 1 and the drawer body 12 are rigidly connected, and the drawer is locked and cannot be pulled out or pushed in; when the rotating shaft 21 rotates counterclockwise, the lead screw 26 rotates in the opposite direction, the engaging part 27 disengages from the latching groove 122, the mechanical lock is released, and the drawer can move freely;

[0033] In order to simultaneously restrict both sides of the drawer body 12 and maintain the stability of the drawer body 12 locking, such as Figures 4-5 As shown, an auxiliary unit is installed on the drawer housing 1. The auxiliary unit includes a second support plate 29 installed on the drawer housing 1 on the side away from the lead screw 26. The second support plate 29 has a vertically arranged second protruding end (not shown in the figure). A bevel gear 210 is mounted on the side bearing of the second protruding end. At the same time, the lead screw 211 is drivenly connected to the center of the bevel gear 210.

[0034] It should be noted that there is an axial constraint between the lead screw 211 and the drawer housing 1 (that is, the axial movement of the drawer housing 1 is restricted by setting a bearing on the side of the drawer housing 1 and movably connecting it to the lead screw 211).

[0035] Furthermore, a latching part 212 is fixedly installed at one end of the second lead screw 211, and a latching groove 122 is also provided on the side of the drawer body 12. A telescopic rod 28 is connected between the second lead screw 211 and the first lead screw 26. The telescopic rod 28 is composed of a first rod 281 and a second rod 282 that are telescopically fitted together. A movable groove 121 adapted to the diameter of the rod is provided on the side of the drawer shell 1 and the drawer body 12. The movable groove 121 allows the telescopic rod 28 to move freely during the drawer pulling process to avoid interference. A sliding groove 283 is provided on the telescopic rod 28, and a limiting part 284 is fixedly installed on the second rod 282. The second rod 282 slides in the sliding groove 283 through the limiting part 284.

[0036] Meanwhile, a drive unit 213 is fixedly installed on the drawer housing 1. The output end of the drive unit 213 is connected to one end of the rotating shaft 21 to drive the rotating shaft 21 to rotate. In this application, the drive unit 213 can be remotely or automatically controlled by control signals (such as buttons or PLC instructions) to meet the requirements of nuclear power plant switchgear to "reduce manual intervention and improve operational safety".

[0037] It should be noted that the diameter of the telescopic rod 28 is smaller than the diameter of the fastening part, and the fastening groove 122 is connected to the movable groove 121 to ensure that the fastening part can be smoothly inserted and locked.

[0038] The driving component 213 acts on the rotating shaft 21, driving the lead screw 26 to rotate through the meshing of bevel gear 22 and bevel gear 25. Simultaneously, lead screw 26 and lead screw 211 are connected by a telescopic rod 28, achieving synchronous rotation of both lead screws.

[0039] The telescopic rod 28 consists of nested rod 1 281 and rod 282. The two rods slide relative to each other through sliding groove 283 and limiting part 284, but maintain torque transmission. When lead screw 1 26 rotates, the telescopic rod 28 transmits torque to lead screw 211, so that the lead screws on both sides rotate synchronously, ensuring that the double-sided fastening parts move synchronously.

[0040] Both lead screw 1 26 and lead screw 211 are connected to the drawer housing 1 via bearing components, allowing only rotation while restricting axial movement. When the lead screw rotates, the engaging parts 1 27 and 212 move linearly along the lead screw axis. The helical directions of the lead screws on both sides are designed to be the same (e.g., both are right-handed). Therefore, when the rotating shaft 21 rotates, the engaging parts 1 27 and 212 move towards the drawer body 12 simultaneously, or retract simultaneously, achieving synchronous locking / unlocking on both sides.

[0041] When the first latching part 27 and the second latching part 212 move toward the drawer body 12 at the same time, or retract at the same time, the telescopic rod 28 automatically adjusts its length through the relative sliding of the first rod 281 and the second rod 282, ensuring that the screw rods on both sides always remain connected.

[0042] The cooperation between the sliding groove 283 and the limiting part 284 allows the rod to slide relative to each other, but restricts circumferential rotation, thereby transmitting the torque of the lead screw 26 to the lead screw 211. When the rotating shaft 21 rotates clockwise, the lead screws on both sides drive the locking part to move toward the drawer body 12. The locking part 27 and the locking part 212 simultaneously engage with the locking groove 122 on the side of the drawer body 12, realizing double-sided mechanical locking and preventing the drawer from shaking or being accidentally pulled out.

[0043] When the rotating shaft 21 rotates counterclockwise, the two locking parts on both sides retract synchronously into the movable groove 121, releasing the lock. At this time, the drawer body 12 can be freely pulled out along the movable groove 121, and the telescopic rod 28 slides in the sliding groove 283 to adapt to the displacement change, so that the drawer is locked synchronously on both sides to make the force on the drawer balanced and avoid tilting or loosening caused by force on one side. It is especially suitable for heavy drawers or vibrating environments.

[0044] Specifically, both the second latching part 212 and the first latching part 27 are hemispherical structures, and the latching groove 122 is a hemispherical inner groove. Through the interplay of these hemispherical structures, precise positioning is provided during latching. Furthermore, the hemispherical latching part and the latching groove 122 can achieve surface contact. Compared to other shapes, such as square or circular partial contacts, the hemispherical structure provides a more uniform pressure distribution on the contact surface, resulting in a tighter fit. This helps enhance the stability of the lock and reduces drawer wobbling or loosening in the locked state.

[0045] Specifically, the contact positions of the second fastening part 212 and the first fastening part 27 with the fastening groove 122 are provided with anti-slip protrusions. These anti-slip protrusions are made of silicone. When the first fastening part 27 is embedded in the fastening groove 122 and the second fastening part 212 is in contact with the corresponding part, the anti-slip protrusions can effectively increase the friction, making the fastening tighter and improving the reliability of locking.

[0046] Meanwhile, the relatively soft silicone material will not scratch or damage the surface of the fastening part and the groove 122. It can enhance friction and cushioning while protecting the surface quality of the contact parts, ensuring that it can maintain good fitting accuracy and locking effect after long-term use.

[0047] Specifically, a crank handle may be provided on the drawer outer shell 1. The crank handle may be connected to one end of the rotating shaft 21. After the crank handle drives the rotating shaft 21 to rotate, it may be fixed to the drawer outer shell 1 by fasteners.

[0048] Specifically, the drawer body 12 has a cabinet door 13, which serves as the main interface for operation and display, integrating multiple key functional components. A handle 14 is fixedly installed on the cabinet door 13. The handle 14 adopts an ergonomic arc design and has an anti-slip surface, making it easy for maintenance personnel to apply force and easily pull the drawer body 12 out of the drawer shell 1, enabling the inspection and maintenance of internal electrical components.

[0049] The cabinet door 13 is equipped with a display screen 16, which is a high-brightness LCD touch screen with anti-electromagnetic interference characteristics. It can display key data such as the opening and closing status of the circuit breaker inside the drawer, current and voltage parameters, and equipment temperature in real time. Through touch operation, maintenance personnel can query historical fault records, set protection parameter thresholds, or perform remote control command interaction to achieve visualized and intelligent equipment management.

[0050] An interlocking unit 15 is installed on the cabinet door 13. This interlocking unit 15 integrates both mechanical and electrical interlocking mechanisms: the mechanical interlocking is linked to the drawer locking assembly 2 through an internal transmission rod. The interlocking mechanism is unlocked only when the drawer is in a safe position (such as when the circuit breaker is open or the grounding switch is closed), allowing the handle 14 to be operated; the electrical interlocking is monitored in real time by communicating with the switch cabinet control system.

[0051] In summary: When an external force is applied to the drive component 213 (such as a motor) or the crank handle, the rotating shaft 21 begins to rotate. Through the meshing of bevel gear 1 22 and bevel gear 25, the horizontal rotational motion is converted into a vertical motion, thereby driving the lead screw 26 to rotate. Lead screw 1 26 and lead screw 211 are connected by a telescopic rod 28 to ensure synchronous rotation of the two lead screws. Due to the axial constraint of the bearing components on the lead screw, when the lead screw rotates, the locking part 1 27 and locking part 212 move linearly along the axis, simultaneously engaging or disengaging from the hemispherical locking groove 122 on the side of the drawer body 12, thereby locking and unlocking the drawer. During the drawer's operation, the telescopic rod 28 adaptively extends and retracts through the sliding groove 283 and the limiting part 284 to avoid mechanical interference; the surface contact design between the hemispherical locking part and the locking groove 122, combined with silicone anti-slip protrusions, further enhances the stability and reliability of the locking mechanism.

[0052] By using the double-sided locking mechanism simultaneously, it avoids loosening or mis-locking caused by force on one side; at the same time, the hemispherical locking structure reduces mechanical wear, and the silicone anti-slip protrusions buffer vibration and impact, ensuring the long-term stable operation of the locking mechanism under complex working conditions, reducing the risk of electric shock, short circuit and other accidents caused by accidentally pulling the drawer while the equipment is energized, and providing reliable protection for the nuclear power plant's power system.

[0053] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A drawer safety locking mechanism for a nuclear power plant switchgear, comprising a drawer housing (1), a drawer body (12), and a locking component (2), characterized in that: The locking assembly (2) includes a rotating shaft (21) with bearings mounted on the side of the drawer housing (1). One end of the rotating shaft (21) is fitted with a bevel gear (22). A first support plate (23) is mounted on the side of the drawer housing (1). A bevel gear (25) is mounted on the first support plate (23) with bearings. The bevel gear (25) meshes with the bevel gear (22). The center of the bevel gear (25) is connected to a lead screw (26). One end of the lead screw (26) is fitted with a fastening part (27). An auxiliary unit is installed on the drawer shell (1). The auxiliary unit includes a second support plate (29) installed on the side of the drawer shell (1). A bevel gear three (210) is mounted on the bearing of the second support plate (29). A lead screw two (211) is connected to the center of the bevel gear three (210). A fastening part two (212) is installed at one end of the lead screw two (211). The drawer body (12) has a latch groove (122) on its side that is adapted to the latching part. A telescopic rod (28) is connected between the second lead screw (211) and the first lead screw (26). A drive component (213) suitable for driving the rotating shaft (21) to rotate is installed on the drawer shell (1).

2. The drawer safety locking mechanism of the nuclear power switchgear according to claim 1, characterized in that: There is an axial constraint between the lead screw (26) and the drawer housing (1). The drawer housing (1) is provided with a bearing on its side, and the bearing is movably sleeved on the lead screw (26).

3. The drawer safety locking mechanism of the nuclear power switchgear according to claim 1, characterized in that: There is an axial constraint between the second lead screw (211) and the drawer housing (1). The drawer housing (1) is provided with a bearing on its side and is movably sleeved on the second lead screw (211).

4. The drawer safety locking mechanism of the nuclear power switchgear according to claim 1, characterized in that: The telescopic rod (28) is composed of a first rod (281) and a second rod (282) that are telescopically fitted together. The drawer shell (1) and the drawer body (12) have movable grooves (121) that are adapted to the diameter of the rods. The movable grooves (121) allow the telescopic rod (28) to move freely during the drawer's operation. The telescopic rod (28) has a sliding groove (283). The second rod (282) has a limiting part (284) installed on it. The second rod (282) slides in the sliding groove (283) through the limiting part (284).

5. The drawer safety locking mechanism of the nuclear power switchgear according to claim 4, characterized in that: The diameter of the telescopic rod (28) is smaller than the diameter of the fastening part, and the fastening groove (122) is connected to the movable groove (121).

6. The drawer safety locking mechanism of the nuclear power switchgear according to claim 2, characterized in that: Both the second fastening part (212) and the first fastening part (27) are hemispherical structures, and the fastening groove (122) is a hemispherical inner groove.

7. The drawer safety locking mechanism of the nuclear power switchgear according to claim 1, characterized in that: The contact positions of the second fastening part (212) and the first fastening part (27) with the fastening groove (122) are provided with anti-slip protrusions, which are made of silicone.

Images