A high-safety low-voltage drawer cabinet

Abstract

The application provides a high-safety low-voltage drawer cabinet, belonging to the technical field of low-voltage drawer cabinets, comprising a cabinet and a drawer seat, the rear end of the drawer seat is provided with a contact plate, the front end of the drawer seat is provided with a panel, the contact plate is provided with a movable contact, the cabinet is provided with a static contact, the drawer seat is provided with an elastic compression mechanism, the elastic compression mechanism comprises a mounting seat, a guide rod, a push block, an elastic piece, a swing block, a transmission assembly and an operating piece, when the drawer seat is in a closed position, the operating piece is driven to drive the swing block to rotate, so that the push block moves towards the direction of the static contact, thereby the elastic piece provides elastic compression force for the movable contact and the static contact. In the application, the elastic compression mechanism is adopted, the elastic piece provides continuous and stable elastic compression force for the movable contact and the static contact, displacement loss within a certain range can be compensated in a normal operation state, thereby the continuity of switch compression is maintained, the contact pressure of the movable contact and the static contact is uniform and consistent, and the power supply reliability is improved.

Description

Technical Field

[0001] This invention relates to the field of low-pressure drawer cabinet technology, and more specifically to a high-safety low-pressure drawer cabinet. Background Technology

[0002] Low-voltage drawer-type switchgear is a core device in power systems used for power distribution and control. It is widely used in industrial plants, commercial buildings, data centers, and other locations. Its drawer-type structure enables independent power supply and maintenance for each circuit. Its working principle involves integrating circuit breakers, contactors, and other electrical components into the drawer base. The movement and separation of moving and stationary contacts are achieved by pulling the drawer out, thus controlling the circuit's on / off state. It offers advantages such as convenient operation, easy maintenance, and high power supply reliability.

[0003] Existing low-voltage drawer cabinets generally use a rigid structure to directly lock the position of the drawer after it is pushed into place. During the pushing, insertion, pressing and long-term operation, the rigid locking clamping force is not adaptable to changes in the dimensional chain due to factors such as manufacturing errors, assembly deviations, fit clearances, indentations at contact points, structural vibrations and preload decay after long-term service. This can easily lead to poor contact of contacts, overheating and even electrical accidents. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a high-safety low-pressure drawer cabinet.

[0005] The technical solution adopted by this invention is as follows: This application provides a high-safety low-pressure drawer cabinet, including a cabinet, on which a drawer base is connected via a sliding assembly. The drawer base has a closed position and an extended position, and a contact plate is provided at its rear end. A plurality of moving contacts are provided on the contact plate, and stationary contacts are provided on the cabinet corresponding to the moving contacts. A panel is provided at the front end of the drawer base, and an elastic pressing mechanism is provided on the drawer base near the contact plate. The elastic pressing mechanism includes a mounting base, a guide rod, a push block, an elastic element, a swing block, a transmission assembly, and an operating element. The operating element is located on the panel. The mounting base is located at the bottom of the drawer seat. The guide rod slides within the mounting base along the drawer's pulling direction. The push block slides on the guide rod, with its end connected to the contact plate. The elastic element is sleeved on the guide rod and abuts against the push block and the contact plate. The swing block is rotatably mounted within the mounting base and located on the side of the push block away from the contact plate. The transmission assembly is located between the operating component and the swing block. When the drawer seat is in the closed position, the operating component is driven to rotate the swing block, causing the push block to move towards the stationary contact. This allows the elastic element to provide elastic clamping force to the moving and stationary contacts, forming an elastic clamping state.

[0006] In some embodiments, a warning mechanism is further included, which includes a fault indication module, a fixed block, an auxiliary switch, a main switch, a trigger rod, and a lever assembly. The fixed block is disposed between the push block and the contact plate and is located on the movement path of the push block. The auxiliary switch is disposed on the fixed block and includes a trigger button and a spring. The lever assembly includes a support plate disposed on the fixed block and a lever plate hinged to the support plate. One end of the spring is fixed to the auxiliary switch, and the other end is inclined toward the push block, with the side of the spring closest to the fixed block abutting against one end of the lever plate. The trigger rod is disposed on the push block, with its end abutting against the other end of the lever plate. The main switch is disposed on the side of the push block near the swing block and includes a pressing plate and a reset member that cooperate with the swing block. The main switch closes when the pressing plate is pressed, the trigger button abuts against the middle of the spring, and the auxiliary switch remains closed under the pressure of the spring. The main switch, the auxiliary switch and the fault indication module form a series circuit, which is used to trigger the fault indication module to issue a warning when both the main switch and the auxiliary switch are closed. When the elastic compression state is formed, the swing block presses against the pressing plate, causing the main switch to close. The trigger rod applies force to the lever plate, and the lever plate releases the spring to apply force to the trigger button, so that the auxiliary switch remains in the open state. When the elastic clamping state is released, the swing block releases its pressure on the pressing plate, causing the main switch to open; the trigger rod releases its force on the lever plate; and the spring plate resumes its force on the trigger button, causing the secondary switch to close. In the elastic compression state, if the preload of the elastic element weakens, the spring will apply force to the trigger button due to elastic reset, causing both the main switch and the auxiliary switch to close, and the fault indication module will issue a warning.

[0007] In some embodiments, an emergency closing mechanism is also included, which includes an electromagnetic push rod disposed in the mounting base and forming a series circuit with the main switch and the auxiliary switch. The electromagnetic push rod is used to drive the push block to move when both the main switch and the auxiliary switch are closed, so that the moving contact and the stationary contact are closed in an emergency.

[0008] In some embodiments, the emergency closing mechanism further includes an elastic locking pin and a push plate. The elastic locking pin is vertically disposed at the bottom of the mounting base. One side of the push plate abuts against the pressing plate, and the other side is connected to the output end of the electromagnetic push rod. The bottom of the push plate is provided with a locking hole adapted to the elastic locking pin. The top of the elastic locking pin is provided with a guide slope on the side facing the push plate, and the bottom of the push plate serves as the unlocking end. When the moving contact and the stationary contact are closed in an emergency, the trigger rod applies force to the lever plate again, causing the auxiliary switch to open and the electromagnetic push rod to stop running. At this time, the top of the elastic locking pin is inserted into the lock hole, so that the moving contact and the stationary contact remain closed.

[0009] In some embodiments, the trigger rod includes a cylinder, a spring, and a top pin. One end of the cylinder is fixed to the side of the push block near the fixed block, and the other end has a channel. The top pin is slidably disposed in the channel, and the spring is used to reset the top pin. When the elastic compression state is formed, the top pin is pressed to allow the spring to store energy. When the elastic compression state is released, the top pin is reset under the action of the spring, causing the main switch to open first.

[0010] In some embodiments, the emergency closing mechanism further includes a swing arm, the panel is provided with an unlocking port, the middle part of the swing arm is rotatably disposed at the bottom of the drawer seat, one end of the swing arm is provided with a linkage groove connected to the unlocking end, and the other end of the swing arm extends to the unlocking port, and the unlocking port is provided with a lock cover.

[0011] In some embodiments, the operating element is an operating handle disposed on the panel, and the transmission assembly includes a gear set, a first transmission shaft and a second transmission shaft. The first transmission shaft is disposed at the bottom of the drawer seat along the direction from the panel to the contact plate, and the second transmission shaft is disposed perpendicular to the first transmission shaft on the bottom of the drawer seat near the contact plate. The swing block is disposed on the second transmission shaft, and the operating handle is connected to the first transmission shaft through the gear set. The second transmission shaft and the first transmission shaft are connected by a worm gear transmission.

[0012] In some embodiments, the middle of the swing block is connected to the second drive shaft, and a first arc-shaped trigger part is provided on its upper part near the pressing plate, and a second arc-shaped trigger part is provided on its lower part near the push block. The first arc-shaped trigger part is closer to the push block than the second arc-shaped trigger part. When the elastic pressing state is released, the first arc-shaped trigger part separates from the pressing plate, and the second arc-shaped trigger part contacts the push block.

[0013] The beneficial effects of the present invention are as follows: The present invention adopts an elastic clamping mechanism, which provides a continuous and stable elastic clamping force to the moving contact and the stationary contact through the elastic element. Under normal operation, it can compensate for displacement loss within a certain range, thereby maintaining the continuity of switch clamping, ensuring uniform contact pressure between the moving contact and the stationary contact, avoiding local overheating, and improving power supply reliability. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of the present invention.

[0015] Figure 1This is a schematic diagram of a high-safety low-pressure drawer cabinet according to the present invention; Figure 2 This is a schematic diagram of the drawer base in the present invention. Figure 1 ; Figure 3 This is a schematic diagram of the drawer base in the present invention. Figure 2 ; Figure 4 This is a schematic diagram of the elastic clamping mechanism in the present invention. Figure 1 ; Figure 5 This is a schematic diagram of the elastic clamping mechanism in the present invention. Figure 2 ; Figure 6 This is a partial schematic diagram of the early warning mechanism in this invention. Figure 1 ; Figure 7 This is a partial schematic diagram of the early warning mechanism in this invention. Figure 2 ; Figure 8 This is a partial structural schematic diagram of the emergency closing mechanism in this invention; In the diagram: 1-Cabinet, 100-Sliding assembly, 2-Drawer base, 200-Contact plate, 201-Moving contact, 202-Panel, 3-Elastic clamping mechanism, 300-Mounting base, 301-Guide rod, 302-Push block, 303-Elastic element, 304-Swing block, 305-Transmission assembly, 306-Operating element, 307-First transmission shaft, 308-Second transmission shaft, 309-Gear set, 4-Warning mechanism, 40-Fixing block, 41-Secondary switch, 410-Trigger button, 411-Spring, 42-Main switch, 43-Trigger rod, 44-Lever assembly, 440-Support plate, 441-Lever plate, 5-Emergency closing mechanism, 50-Electromagnetic push rod, 51-Elastic locking pin, 510-Guide slope, 511-Unlocking end, 52-Push plate, 520-Lock hole. Detailed Implementation

[0016] The following description provides specific application scenarios and requirements for this specification, intended to enable those skilled in the art to make and use the contents of this specification. Various partial modifications to the disclosed embodiments will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments and applications without departing from the spirit and scope of this specification. Therefore, this specification is not limited to the embodiments shown, but rather to the widest scope consistent with the claims.

[0017] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "longitudinal", "lateral", "radial", "length", "width", "thickness", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element or component to have a specific orientation, or to be constructed and operated in a specific orientation.

[0018] It should be noted that the terms "first," "second," and similar words do not indicate any order, quantity, or importance, but are only used to distinguish different components and should not be construed as limiting the embodiments of this application.

[0019] It should be noted that the terms "installation," "setup," "equipped with," "connection," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral structures; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium, or internal connections between two devices, components, or parts.

[0020] It should be noted that the terms "in some embodiments," "exemplarily," and "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as "in some embodiments," "exemplarily," or "for example" should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "in some embodiments," "exemplarily," and "for example" is intended to present related concepts in a specific manner, meaning that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of the above terms in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0021] Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0022] Regarding the accompanying drawings of this application, it should be clearly understood that the drawings are for illustrative and descriptive purposes only and are not intended to limit the scope of this specification. It should also be understood that the drawings are not necessarily drawn to scale.

[0023] Existing low-pressure drawer cabinets use a rigid locking structure, which cannot adapt to changes in the size chain and is prone to problems such as poor contact and overheating.

[0024] Based on the above issues, such as Figures 1 to 8 As shown, this application proposes a high-safety low-voltage drawer cabinet, including a cabinet 1. Several drawer seats 2 are connected to the cabinet 1 via a sliding assembly 100. The sliding assembly 100 uses ball bearing guides or pulleys in conjunction with a slide rail to ensure smooth drawer seat 2 operation and strong load-bearing capacity. Each drawer seat 2 has a closed position and an extended position. A contact plate 200 is provided at its rear end, and several moving contacts 201 are arranged at lateral intervals along the contact plate 200. A stationary contact is fixedly provided on the cabinet 1 at the position corresponding to the moving contacts 201. The stationary contact is electrically connected to an external busbar. A panel 202 is connected to the front end of each drawer seat 2.

[0025] An elastic pressing mechanism 3 is provided on the side of the drawer seat 2 near the contact plate 200. The elastic pressing mechanism 3 includes a mounting base 300, a guide rod 301, a push block 302, an elastic element 303, a swing block 304, a transmission assembly 305, and an operating element 306. The operating element 306 is disposed on the panel 202. The mounting base 300 is connected to the bottom of the drawer seat 2. The guide rod 301 is slidably disposed in the guide hole in the mounting base 300 along the drawer-out direction of the drawer seat 2. The push block 302 is slidably sleeved on the guide rod 301, and its end is fixedly connected to the contact plate 200. The elastic element 303 is a cylindrical helical compression spring, sleeved on the guide rod 301, with its two ends abutting against the end face of the push block 302 and the inner side of the contact plate 200, respectively. The swing block 304 is rotatably disposed in the mounting base 300 and located on the side of the push block 302 away from the contact plate 200. The transmission component 305 is disposed between the operating element 306 and the swing block 304, and is used to convert the rotation of the operating element 306 into the swing of the swing block 304.

[0026] During operation, pushing the drawer seat 2 to the closed position drives the operating component 306, which in turn drives the swing block 304 to rotate via the transmission assembly 305. The swing block 304 pushes the push block 302 along the guide rod 301 toward the stationary contact, compressing the elastic element 303. This provides a continuous and stable elastic clamping force between the moving contact 201 and the stationary contact, creating an elastic clamping state. When there are changes in the dimensional chain, the elastic element 303 can automatically compensate through its own deformation, ensuring that the contact pressure between the moving contact 201 and the stationary contact is uniform.

[0027] In some embodiments, the operating element 306 is an operating handle disposed on the panel 202, and the transmission assembly 305 includes a gear set 309, a first transmission shaft 307, and a second transmission shaft 308. The first transmission shaft 307 is rotatably disposed at the bottom of the drawer seat 2 via a bearing seat along the direction from the panel 202 to the contact plate 200. The second transmission shaft 308 is perpendicular to the first transmission shaft 307 and is rotatably disposed at the bottom of the drawer seat 2 near the contact plate 200 via a bearing seat. The swing block 304 is fixedly connected to the second transmission shaft 308 via a flat key. The rotating shaft of the operating handle is connected to the front end of the first transmission shaft 307 via the gear set 309, and one end of the second transmission shaft 308 is connected to the rear end of the first transmission shaft 307 via a worm gear. Rotating the operating handle drives the first transmission shaft 307 to rotate via the gear set 309, which in turn drives the second transmission shaft 308 to rotate via the worm gear, thereby causing the swing block 304 to swing.

[0028] The worm gear is a self-locking type. Rotating the operating handle drives the first transmission shaft 307 to rotate via the gear set 309, which in turn drives the second transmission shaft 308 to rotate via the worm gear, thereby causing the swing block 304 to swing. When the operating handle stops rotating and the equipment is in an elastically pressed state, the worm gear can automatically lock the rotation of the second transmission shaft 308 to prevent the swing block 304 from swinging unexpectedly, ensuring that the pressing state between the moving contact 201 and the stationary contact is stable and reliable, and further improving the safety of equipment operation.

[0029] In some embodiments, there are multiple elastic pressing mechanisms 3, which are spaced apart along the axial direction of the second transmission shaft 308. Their swing blocks 304 are all connected to the second transmission shaft 308 via flat keys. Rotating the operating handle can drive multiple elastic pressing mechanisms 3 to work simultaneously, achieving multi-point synchronous pressing and further improving the uniformity of pressing.

[0030] In some embodiments, a warning mechanism 4 is further included, which can provide an early warning of the weakening of the preload of the elastic element 303. The warning mechanism 4 includes a fault indication module, a fixing block 40, an auxiliary switch 41, a main switch 42, a trigger rod 43, and a lever assembly 44. The fixing block 40 is disposed between the push block 302 and the contact plate 200, and is located on the movement path of the push block 302. The auxiliary switch 41 is disposed on the side of the fixing block 40 near the push block 302, and includes a trigger button 410 and a spring piece 411. The lever assembly 44 includes a support plate 440 fixed to the fixing block 40 and a lever plate 44 hinged to the support plate 440 by a pin. 1. One end of the spring piece 411 is fixed to the housing of the auxiliary switch 41, and the other end is inclined toward the push block 302. The side of this end near the fixed block 40 abuts against one end of the lever plate 441. The trigger rod 43 is fixed to the side of the push block 302 near the fixed block 40, and its end abuts against the other end of the lever plate 441. The main switch 42 is fixed to the side of the push block 302 near the swing block 304. It includes a pressing plate and a reset member that cooperate with the swing block 304. The reset member is a compression spring used for resetting the pressing plate.

[0031] Both the main switch 42 and the auxiliary switch 41 are microswitches, and their internal contact assemblies can be configured as normally open or normally closed as required, which will not be described in detail here.

[0032] In some embodiments, the main switch 42 closes when the pressing plate is applied force, i.e., it is normally in the open state. The trigger button 410 abuts against the middle of the spring 411. Under the pressure of the spring 411, the auxiliary switch 41 remains in the closed state, i.e., it is normally in the closed state. The main switch 42, the auxiliary switch 41, and the fault indication module form a series circuit. When both the main switch 42 and the auxiliary switch 41 are closed, the circuit is completed, triggering the fault indication module to issue an audible and visual warning.

[0033] When the drawer seat 2 is closed and in an elastically pressed state, the swing block 304 presses against the pressing plate, causing the main switch 42 to close; at the same time, the trigger rod 43 moves with the push block 302, applying force to one end of the lever plate 441, causing the lever plate 441 to rotate around the pin shaft, and the other end of the lever plate 441 pushes up the spring piece 411, releasing the force of the spring piece 411 on the trigger button 410, so that the auxiliary switch 41 remains in the open state. At this time, the series circuit is broken, and the fault indication module does not work.

[0034] When the elastic clamping state is released, the swing block 304 releases its pressure on the pressing plate, and the pressing plate resets under the action of the reset member, causing the main switch 42 to open; at the same time, the trigger rod 43 moves in the opposite direction with the push block 302, releasing the force on the lever plate 441, and the spring plate 411 resets itself by its own elasticity, pressing the trigger button 410 again, causing the auxiliary switch 41 to close. At this time, because the main switch 42 is open, the series circuit is still open, and the fault indication module does not work.

[0035] In the elastic compression state, if the preload of the elastic element 303 weakens, the spring piece 411 will re-balance with the main switch 42 through the lever plate 441. During this process, the spring piece 411 resets and presses the trigger button 410, causing the auxiliary switch 41 to close. At this time, the main switch 42 is still in the closed state, the series circuit is connected, and the fault indication module issues an audible and visual warning to remind maintenance personnel to perform timely maintenance.

[0036] With this configuration, the early warning mechanism 4, through the timing coordination and series logic with the main switch 42 and the auxiliary switch 41, achieves accurate identification of the non-faulty pressure release of the elastic element 303 and the fault state of the preload decay of the elastic element 303 when the drawer is normally pulled out, fundamentally eliminating false early warning phenomena and greatly improving the reliability and operation and maintenance efficiency of the early warning system.

[0037] When the elastic clamping mechanism 3 is running, the spring 411 is always raised and the auxiliary switch 41 remains open. When the preload of the elastic element 303 weakens, the spring 411 can sense it in time and trigger the auxiliary switch 41 to close through elastic reset, which is highly sensitive. At the same time, the emergency closing mechanism 5 and the early warning system are linked by the series circuit to ensure that the electromagnetic push rod 50 is energized only when the preload of the elastic element 303 weakens and contact clamping compensation is required. Under all other conditions, it is in a completely de-energized state, achieving zero standby power consumption while avoiding the ineffective cycle operation loss of the electromagnetic push rod 50 and significantly extending its service life.

[0038] In some embodiments, the trigger rod 43 includes a cylinder, a spring, and a top pin. One end of the cylinder is fixed to the side of the push block 302 near the fixed block 40, and the other end has an axial channel. The top pin is slidably disposed in the channel, and the spring is disposed in the channel, with its two ends respectively abutting against the bottom of the cylinder and the inner end face of the top pin for resetting the top pin. When the elastic compression state is formed, the outer end face of the top pin abuts against the lever plate 441, and the pressure causes the spring to compress and store energy. When the elastic compression state is released, the top pin extends outward under the action of the spring, causing the main switch 42 to disconnect first, avoiding accidental triggering of the alarm during the release process.

[0039] In some embodiments, an emergency closing mechanism 5 is further included. The emergency closing mechanism 5 includes an electromagnetic push rod 50, which is fixed in the mounting base 300, with its output end facing the push block 302. The electromagnetic push rod 50 forms a series circuit with the main switch 42 and the auxiliary switch 41. When both the main switch 42 and the auxiliary switch 41 are closed, the circuit is connected, the electromagnetic push rod 50 is energized, and drives the push block 302 to move towards the stationary contact, so that the moving contact 201 and the stationary contact are pressed together again, thereby achieving emergency closing.

[0040] If the electromagnetic push rod 50 only pushes the push block 302 back to its original pressing position without forming a subsequent holding position, then as the auxiliary switch 41 is opened, the electromagnetic push rod 50 loses power and retracts, and the push block 302 will also lose its holding position, resulting in compensation failure.

[0041] Therefore, the emergency closing mechanism 5 also includes an elastic locking pin 51 and a push plate 52. The elastic locking pin 51 is vertically disposed at the bottom of the mounting base 300 and has a return spring inside, which can extend and retract vertically. One side of the push plate 52 abuts against the side of the pressing plate, and the other side is fixedly connected to the output end of the electromagnetic push rod 50. Its bottom has a locking hole 520 that matches the top of the elastic locking pin 51. The top of the elastic locking pin 51 facing the push plate 52 has a guide slope 510, and its bottom extends to the bottom of the mounting base 300 as an unlocking end 511.

[0042] When the electromagnetic push rod 50 drives the push plate 52 to move, the push plate 52 pushes the pressing plate and push block 302 to move synchronously. When the moving contact 201 and the stationary contact are in emergency closed position, the trigger rod 43 applies force to the lever plate 441 again, causing the auxiliary switch 41 to open and the electromagnetic push rod 50 to stop running due to power failure. At this time, the top of the elastic locking pin 51 is inserted into the locking hole 520 at the bottom of the push plate 52 under the action of the return spring, locking the push plate 52 and thus maintaining the closed state of the moving contact 201 and the stationary contact. To unlock, pull down the unlocking end to remove the top of the elastic locking pin 51 from the locking hole 520. The unlocking end is located at the top of the lower drawer seat 2, making operation convenient.

[0043] In some embodiments, the emergency closing mechanism 5 further includes a rocker arm. An unlocking port is provided on the panel 202. The middle portion of the rocker arm is rotatably mounted on the bottom of the drawer seat 2 via a pin. One end of the rocker arm has a linkage groove that engages with the unlocking end of the elastic locking pin 51, and the other end extends to the unlocking port. A lock cover is hinged to the unlocking port. Normally, the lock cover is closed to prevent accidental operation. When unlocking is required, the lock cover is opened, and the end of the rocker arm is pressed, causing the rocker arm to rotate and pulling the elastic locking pin 51 downwards, thus unlocking the drawer. This allows for direct unlocking from the front.

[0044] In some embodiments, the middle of the swing block 304 is connected to the second drive shaft 308, and a first arc-shaped trigger part 3041 is integrally formed on its upper part near the pressing plate, and a second arc-shaped trigger part 3042 is integrally formed on its lower part near the push block 302. The first arc-shaped trigger part 3041 is closer to the push block 302 than the second arc-shaped trigger part 3042. When the elastic pressing state is released, the operating handle is rotated in the opposite direction, causing the swing block 304 to swing in the opposite direction. The first arc-shaped trigger part 3041 separates from the pressing plate, and the second arc-shaped trigger part 3042 contacts the push block 302, ensuring that the main switch 42 is disconnected.

[0045] In summary, after reading this detailed disclosure, those skilled in the art will understand that the foregoing detailed disclosure is presented by way of example only and is not restrictive. Although not explicitly stated herein, those skilled in the art will understand that the requirements of this application encompass various reasonable changes, improvements, and modifications to the embodiments. These changes, improvements, and modifications are intended to be made by this application and are within the spirit and scope of the exemplary embodiments of this application.

[0046] Furthermore, it should be understood that in the foregoing description of the embodiments of this application, various features are combined in a single embodiment, drawing, or description for the purpose of simplifying the understanding of a feature. However, this does not mean that the combination of these features is necessary, and those skilled in the art may readily identify some of the devices as separate embodiments when reading this application. That is, the embodiments in this application can also be understood as an integration of multiple sub-embodiments. It is also valid when each sub-embodiment contains fewer than all the features of a single foregoing disclosed embodiment.

[0047] Finally, it should be understood that the embodiments disclosed herein are illustrative of the principles of the embodiments of this application. Other modified embodiments are also within the scope of this application. Therefore, the embodiments disclosed herein are merely examples and not limitations. Those skilled in the art can adopt alternative configurations to implement the applications in this application based on the embodiments in this application. Therefore, the embodiments of this application are not limited to the embodiments precisely described in the application.

Claims

1. A high-security low-voltage drawer cabinet, comprising a cabinet, a drawer base connected to the cabinet via a sliding assembly, the drawer base having a closed position and an extended position, a contact plate disposed at its rear end, the contact plate having a plurality of moving contacts, a stationary contact disposed on the cabinet corresponding to the moving contacts, and a panel disposed at the front end of the drawer base, characterized in that, An elastic pressing mechanism is provided on the drawer seat near the contact plate. The elastic pressing mechanism includes a mounting base, a guide rod, a push block, an elastic element, a swing block, a transmission assembly, and an operating component. The operating component is located on the panel. The mounting base is located at the bottom of the drawer seat. The guide rod slides within the mounting base along the drawer's pulling direction. The push block slides on the guide rod, with its end connected to the contact plate. The elastic element is sleeved on the guide rod and abuts against the push block and the contact plate. The swing block is rotatably located within the mounting base and is situated on the side of the push block away from the contact plate. The transmission assembly is located between the operating component and the swing block. When the drawer seat is in the closed position, the operating component is driven to rotate the swing block, causing the push block to move towards the stationary contact. This allows the elastic element to provide elastic pressing force to the moving and stationary contacts, forming an elastic pressing state. It also includes an early warning mechanism, which comprises a fault indication module, a fixed block, an auxiliary switch, a main switch, a trigger rod, and a lever assembly. The fixed block is positioned between the push block and the contact plate, and is located on the movement path of the push block. The auxiliary switch is mounted on the fixed block and includes a trigger button and a spring. The lever assembly includes a support plate mounted on the fixed block and a lever plate hinged to the support plate. One end of the spring is fixed to the auxiliary switch, and the other end is inclined toward the push block, with the side of this end near the fixed block abutting against one end of the lever plate. The trigger rod is mounted on the push block, with its end abutting against the other end of the lever plate. The main switch is mounted on the side of the push block near the swing block and includes a pressing plate and a reset component that cooperate with the swing block. The main switch closes when the pressing plate is applied force, and the trigger button abuts against the middle of the spring. Under the pressure of the spring, the auxiliary switch remains closed. The main switch, the auxiliary switch, and the fault indication module form a series circuit, which is used to trigger the fault indication module to issue a warning when both the main switch and the auxiliary switch are closed. When the elastic compression state is formed, the swing block presses against the pressing plate, causing the main switch to close. The trigger rod applies force to the lever plate, and the lever plate releases the spring to apply force to the trigger button, so that the auxiliary switch remains in the open state. When the elastic clamping state is released, the swing block releases its pressure on the pressing plate, causing the main switch to open; the trigger rod releases its force on the lever plate; and the spring plate resumes its force on the trigger button, causing the secondary switch to close. In the elastic compression state, if the preload of the elastic element weakens, the spring will apply force to the trigger button due to elastic reset, causing both the main switch and the auxiliary switch to close, and the fault indication module will issue a warning.

2. The high-security low-pressure drawer cabinet according to claim 1, characterized in that, It also includes an emergency closing mechanism, which includes an electromagnetic push rod. The electromagnetic push rod is installed in the mounting base and forms a series circuit with the main switch and the auxiliary switch. When both the main switch and the auxiliary switch are closed, it drives the push block to move, so that the moving contact and the stationary contact close in an emergency.

3. The high-security low-pressure drawer cabinet according to claim 2, characterized in that, The emergency closing mechanism also includes an elastic locking pin and a push plate. The elastic locking pin is vertically arranged at the bottom of the mounting base. One side of the push plate abuts against the pressing plate, and the other side is connected to the output end of the electromagnetic push rod. The bottom of the push plate is provided with a locking hole that matches the elastic locking pin. The top of the elastic locking pin is provided with a guide slope on the side facing the push plate, and its bottom serves as the unlocking end. When the moving contact and the stationary contact are closed in an emergency, the trigger rod applies force to the lever plate again, causing the auxiliary switch to open and the electromagnetic push rod to stop running. At this time, the top of the elastic locking pin is inserted into the lock hole, so that the moving contact and the stationary contact remain closed.

4. The high-security low-pressure drawer cabinet according to claim 1, characterized in that, The trigger rod includes a cylinder, a spring, and a top pin. One end of the cylinder is fixed to the side of the push block near the fixed block, and the other end has a channel. The top pin is slidably disposed in the channel, and the spring is used to reset the top pin. When the elastic compression state is formed, the top pin is pressed to allow the spring to store energy. When the elastic compression state is released, the top pin is reset under the action of the spring, causing the main switch to open first.

5. A high-security low-pressure drawer cabinet according to claim 3, characterized in that, The emergency closing mechanism also includes a swing arm, and the panel is provided with an unlocking port. The middle part of the swing arm is rotatably mounted on the bottom of the drawer base. One end of the swing arm is provided with a linkage groove that connects to the unlocking end, and the other end extends to the unlocking port. The unlocking port is provided with a lock cover.

6. A high-security low-pressure drawer cabinet according to claim 3, characterized in that, The operating component is an operating handle mounted on the panel. The transmission assembly includes a gear set, a first transmission shaft, and a second transmission shaft. The first transmission shaft is located at the bottom of the drawer base along the direction from the panel to the contact plate. The second transmission shaft is perpendicular to the first transmission shaft and is located on the bottom of the drawer base near the contact plate. The swing block is mounted on the second transmission shaft. The operating handle is connected to the first transmission shaft via the gear set. The second transmission shaft is connected to the first transmission shaft via a worm gear transmission.

7. A high-security low-pressure drawer cabinet according to claim 6, characterized in that, The middle of the swing block is connected to the second drive shaft. A first arc-shaped trigger part is provided on its upper part near the pressing plate, and a second arc-shaped trigger part is provided on its lower part near the push block. The first arc-shaped trigger part is closer to the push block than the second arc-shaped trigger part. When the elastic pressing state is released, the first arc-shaped trigger part separates from the pressing plate, and the second arc-shaped trigger part contacts the push block.

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