A handcart type high voltage switch cabinet with a pushing mechanism

Abstract

The application provides a handcart type high-voltage switch cabinet with a propulsion mechanism, and relates to the technical field of rocket launching maintenance ships. The handcart type high-voltage switch cabinet with the propulsion mechanism comprises a switch cabinet body and a handcart type circuit breaker which is slidingly and cooperatively installed in the middle cavity of the switch cabinet body. The movable contact part of the handcart type circuit breaker adopts a plum blossom contact, moves synchronously with the handcart type circuit breaker, and realizes electrical communication with the corresponding stationary contact in the switch cabinet body through breaking. The handcart type high-voltage switch cabinet further comprises a contact compensation adjusting assembly. The application solves the problems of the existing handcart type high-voltage switch cabinet, such as the easy axial deviation of the movable and stationary contacts, the uneven contact of the contact patch, and the poor contact stability. Through the spring pressure rod cooperating with the wedge surface linkage monitoring ring, relying on the global detection of the contact deviation state by the single group displacement sensor, and combining the liquid driving circulating assembly and the precise liquid control of the throttling tee valve, the self-adaptive differential centering compensation of each contact patch is realized.

Description

Technical Field

[0001] This invention relates to the field of high-voltage switchgear technology, specifically a handcart-type high-voltage switchgear with a propulsion mechanism. Background Technology

[0002] Handcart-type high-voltage switchgear is a core switching device in power transmission and distribution systems, widely used in industrial and mining enterprises, substations, and smart grid power supply scenarios. It mainly relies on pull-out handcart-type circuit breakers to realize circuit connection, disconnection, and fault protection. It has outstanding advantages such as compact structure, convenient operation, modular maintenance, and high safety. At present, the moving contacts of handcart-type circuit breakers generally adopt the plum blossom contact structure. Compared with the traditional integrated contact, the plum blossom contact is formed by multiple independent contact pieces, which has the characteristics of more contact points, strong conductivity and current carrying capacity, and good elastic fitting performance. It can effectively adapt to high voltage and high current carrying conditions, and can buffer the contact impact to a certain extent, improving the stability of electrical connection. It is the mainstream contact structure form of high-voltage switchgear circuit breakers.

[0003] However, during the actual feeding and docking process of the trolley-type circuit breaker, assembly deviations such as misalignment of the moving and stationary contacts and positional offsets are prone to occur. Moreover, the causes of these deviations are complex and influenced by numerous factors. On the one hand, the vibration, cabinet settlement and deformation, and track wear and corrosion generated by the long-term operation of the switchgear can cause slight deformation and level deviation of the trolley's travel track, causing the feeding trajectory of the trolley-type circuit breaker to deviate. On the other hand, frequent pushing and pulling operations of the trolley can cause wear on the traveling wheels and loosening of the positioning structure, resulting in a decrease in the positioning accuracy of the trolley and the generation of initial alignment deviations. At the same time, the superposition of multiple factors such as equipment assembly and manufacturing tolerances, on-site installation alignment errors, and long-term temperature rise deformation makes it impossible for each contact piece to maintain coaxial contact with the stationary contact during the feeding and docking of the 21-type contact piece. Furthermore, the offset direction and degree of different contact pieces are random and different. Conventional rigid alignment structures cannot adapt to complex multi-dimensional deviation conditions, ultimately leading to frequent problems of misalignment of the moving and stationary contacts.

[0004] When the moving and stationary contacts are misaligned, some of the contact pieces of the cloverleaf contact will tilt and deflect due to lateral pressure from the stationary contact. This prevents the contact pieces from fully fitting against the end face of the stationary contact, resulting in only localized edge contact. This significantly reduces the effective conductive contact area of ​​the contact, directly increasing the contact resistance. During long-term operation, this can easily lead to faults such as contact overheating, thermal erosion, and arc discharge, severely affecting power supply stability. At the same time, misalignment can cause uneven stress on each group of contact pieces, resulting in some contact pieces having poor connections and others being overloaded. Under long-term alternating loads, this can easily cause contact piece fatigue deformation and elastic failure, further exacerbating the poor contact problem. It can even cause contact welding, jamming, and adhesion, leading to circuit breaker jamming and failure to operate. This greatly reduces the safety and reliability of high-voltage switchgear operation and poses a serious power safety hazard.

[0005] Based on the above viewpoints, those skilled in the art have proposed a handcart-type high-voltage switchgear with a propulsion mechanism. Summary of the Invention

[0006] Technical problems to be solved

[0007] To address the shortcomings of existing technologies, this invention provides a handcart-type high-voltage switchgear with a propulsion mechanism, which solves the problems of easy axial misalignment of moving and stationary contacts, uneven contact fit, and poor contact stability in existing handcart-type high-voltage switchgear. By using a spring pressure rod in conjunction with a wedge-shaped linkage monitoring ring, relying on a single set of displacement sensors to detect the contact misalignment status across the entire range, and combining a liquid-driven circulation component and a throttling three-way valve for precise liquid control, adaptive differential centering compensation for each contact piece is achieved.

[0008] Technical solution

[0009] To achieve the above objectives, the present invention provides the following technical solution: a trolley-type high-voltage switchgear with a propulsion mechanism, comprising a switchgear body and a trolley-type circuit breaker slidably mounted in the central cavity of the switchgear body. The moving contact portion of the trolley-type circuit breaker adopts a staggered contact, which moves synchronously with the trolley-type circuit breaker and achieves electrical connection with the corresponding stationary contact within the switchgear body through disconnection. The invention also includes a contact compensation and adjustment assembly, wherein the contact compensation and adjustment assembly comprises:

[0010] The outer shell is made of insulating material and is sleeved and covered on the outside of the plum blossom contact. The hollow cavity inside forms a base for assembling and installing the other components of the contact compensation and adjustment assembly.

[0011] A spring rod, matching the number of contact pieces of the plum blossom contact, is slidably mounted on the end of the sleeve housing via an elastic element, and the spring rod is connected to the contact pieces of the plum blossom contact accordingly.

[0012] The monitoring ring is slidably assembled into the hollow cavity inside the sleeve shell via an elastic element. The end face of the monitoring ring facing each spring rod and the end of the spring rod extending toward the monitoring ring form a wedge-shaped mating structure.

[0013] A displacement sensor, mounted on the outer wall of the sleeve housing, is used to monitor the displacement of the monitoring ring.

[0014] A hydraulic drive ring is slidably fitted into the hollow cavity of the sleeve housing, wherein the hydraulic drive ring drives the spring rod to move along the axial direction of the plum blossom contact by reciprocating back and forth.

[0015] The liquid-driven circulation assembly is mounted and fixed to the handcart-type circuit breaker to drive the hydraulic drive ring to slide back and forth.

[0016] Preferably, the spring rod consists of a rod head connected to the plum blossom contact and a rod body segment connected to the rod head via an elastic element;

[0017] The rod section of the spring rod extends backward, and the elastic element connecting the two sections of the spring rod has a greater elastic coefficient than the elastic element of the sleeve shell that mates with the spring rod. This causes the elastic element between the sleeve shell and the spring rod to deform preferentially under compression.

[0018] Preferably, the spring rod has an outwardly protruding head, and the outer edge of the plum blossom contact has a groove that matches the protrusion. The spring rod head is snapped into the groove of the plum blossom contact.

[0019] Preferably, the section of the spring rod extending toward the monitoring ring is provided with a diamond-shaped slot, and the diamond-shaped slot is arranged at an angle toward the hydraulic drive ring.

[0020] The hydraulic drive ring is provided with several rods extending toward the spring rod. Rollers are mounted on the rods. The rollers form a rolling fit with the diamond-shaped slot of the spring rod. The rollers drive the spring rod to slide radially by pressing against the upper and lower walls of the diamond-shaped slot.

[0021] Preferably, the rollers on the hydraulic drive ring are arranged at the center of the diamond-shaped slot of the spring rod, and the rollers maintain a distance from the upper and lower edges of the diamond-shaped slot, with the distance ranging from 1mm to 3mm.

[0022] Preferably, the liquid-driven circulation assembly includes:

[0023] Several throttling three-way valves are respectively assembled on the outer wall of each sleeve housing. The throttling three-way valves are connected to the corresponding liquid chamber at the rear end of the hydraulic drive ring, and each throttling three-way valve is connected to the circulation pipe assembly to realize pipeline interconnection. The throttling three-way valves are used to regulate the fluid flow state to ensure that the liquid chambers corresponding to each sleeve housing can complete the liquid injection and suction actions at a uniform speed.

[0024] The circulation pipe kit is composed of multiple pipes. The circulation pipe kit includes straight pipes and bends. The straight pipes are used to connect multiple sets of throttling three-way valves at the same height in series, and the bends are used to connect multiple sets of throttling three-way valves at different heights.

[0025] The hydraulic power source is connected to each throttling three-way valve via a circulation pipe assembly. By drawing or injecting liquid into the liquid chamber at the rear end of the hydraulic drive ring, the sliding drive of the hydraulic drive ring is realized.

[0026] Preferably, the hydraulic source includes:

[0027] The liquid storage tank, which is externally mounted, is used to store the liquid medium that can drive the sliding motion of the hydraulic drive ring.

[0028] A circulation pump, mounted on the outside of the storage tank, is electrically connected to a monitoring ring for pumping liquid medium into the circulation tubing assembly.

[0029] The piston assembly, installed below the reservoir, is used to push the liquid medium into the circulation pipe assembly.

[0030] Preferably, the displacement sensor is configured with at least two detection threshold points, wherein the first threshold point corresponds to the first displacement stroke of the monitoring ring and is used to detect the translational deviation of the plum blossom contact relative to the stationary contact. Under this condition, correction intervention is required, and the displacement threshold is 0.3 to 0.9 mm; the second threshold point corresponds to the second displacement stroke of the monitoring ring and is used to detect the track offset fault of the handcart circuit breaker, and the displacement threshold is greater than 1.2 mm.

[0031] Preferably, the switch cabinet body and the handcart-type circuit breaker are also provided with a magnetic guide rail assembly for use in conjunction, the magnetic guide rail assembly including a moving magnetic rail unit and a fixed magnetic rail unit;

[0032] The moving magnetic rail units are respectively installed on both sides of the trolley-type circuit breaker, and the fixed magnetic rail units are fixedly arranged on the inner side wall of the switchgear body. The moving magnetic rail units and the fixed magnetic rail units are arranged opposite to each other and cooperate with each other. This magnetic guide rail assembly relies on the magnetic force generated between the two to realize the feed movement of the trolley-type circuit breaker.

[0033] This invention provides a handcart-type high-voltage switchgear with a propulsion mechanism. It possesses the following technical features and beneficial effects:

[0034] 1. The device adopts a wedge-shaped linkage transmission structure of spring pressure rod and monitoring ring. When any single contact piece deviates or tilts abnormally, the corresponding displacement change of the spring pressure rod can drive the monitoring ring to generate a corresponding slippage through the wedge-shaped transmission. The alignment deviation of all contacts can be collected over the entire area by a single displacement sensor. There is no need to assemble a separate detection sensor for each contact piece, which greatly simplifies the equipment detection structure, effectively reduces the sensor hardware cost, wiring complexity and equipment failure rate, and simplifies the subsequent equipment inspection, maintenance and calibration work. It is also suitable for the miniaturization and integration assembly requirements of high voltage switchgear.

[0035] 2. Through the clearance fit structure between the diamond-shaped slot and the roller, combined with the precise flow control function of the liquid-driven circulation component, adaptive differential centering compensation of all contact pieces is achieved. During the handcart feeding docking process, the degree of offset of different contact pieces varies. The contact piece with a larger offset can obtain a larger adjustment stroke and clamping force corresponding to the spring pressure rod, which can accurately correct the tilt and deflection posture of the contact piece. This solves the technical problems of reduced contact area and local loose connection after the contact piece offset in the traditional structure. At the same time, with the cooperation structure of double elastic elements with different stiffness, it not only ensures the stability of the adjustment action and avoids excessive compression damage to the contact piece, but also balances the clamping load of each group of contact pieces, so that all contact pieces can fully and tightly fit with the stationary contact, significantly improving the coaxiality and conductive contact performance of the moving and stationary contact docking, reducing contact resistance, and effectively avoiding faults such as overheating, arcing, and poor contact during equipment operation.

[0036] 3. The hydraulic power source is equipped with a dual-mode drive mechanism, which can adapt to different operating conditions of the equipment and achieve adaptive switching of functions. Under normal operating conditions, the circulating pump and the throttling three-way valve complete the quantitative and directional medium delivery, realize the fine and normal adaptive compensation and adjustment of contact deviation, and ensure the long-term stable operation of the switchgear. When encountering sudden faults such as short circuits, the piston assembly can respond quickly, drive all the liquid medium in the pipeline to quickly return and reset, so that the hydraulic drive ring and spring pressure rod can quickly retract and release the clamping constraint on the contacts, avoid the contacts from continuously bearing mechanical loads under high current short circuit conditions, and effectively eliminate safety hazards such as contact burning, jamming and adhesion, and welding. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the structure of the handcart-type circuit breaker within the switchgear body in this invention;

[0038] Figure 2 This is a schematic diagram of the structure of the handcart-type circuit breaker placed outside the switch cabinet body in this invention;

[0039] Figure 3 This is a schematic diagram of the handcart-type circuit breaker after it has been separated from the contact compensation and adjustment assembly in this invention;

[0040] Figure 4 This is a schematic diagram of the structure of the handcart-type circuit breaker and magnetic rail assembly in this invention;

[0041] Figure 5 This is a schematic diagram of the structure of the handcart-type circuit breaker after it is separated from the sleeve housing in this invention;

[0042] Figure 6 This is a schematic diagram of the structure of the handcart-type circuit breaker after the concealed sleeve housing in this invention;

[0043] Figure 7 This is a schematic diagram of the first interaction between the spring pressure rod, the monitoring ring, and the displacement sensor in this invention;

[0044] Figure 8 This is a schematic diagram of the second assembly of the spring pressure rod, the monitoring ring, and the displacement sensor in this invention;

[0045] Figure 9 This is a schematic diagram of the structure of the magnetic guide rail assembly, the contact compensation and adjustment assembly, and the liquid drive circulation assembly in this invention;

[0046] Figure 10 This is a partial sectional view of the handcart-type circuit breaker in this invention;

[0047] Figure 11 This is a comparison diagram of the displacement before and after the spring pressure rod and the hydraulic drive ring are engaged in the present invention.

[0048] The components include: 1. Switchgear body; 2. Handcart-type circuit breaker; 21. Plexicon contacts; 3. Magnetic guide rail assembly; 4. Contact compensation and adjustment assembly; 5. Liquid-driven circulation assembly.

[0049] 41. Sleeve housing; 42. Spring pressure rod; 43. Monitoring ring; 44. Hydraulic drive ring; 45. Displacement sensor;

[0050] 51. Circulation pipe kit; 52. Throttling three-way valve; 53. Liquid reservoir; 54. Circulation pump; 55. Piston kit. Detailed Implementation

[0051] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0052] Example, reference Figure 1 , Figure 2 and Figure 5As shown, this embodiment of the invention provides a trolley-type high-voltage switchgear with a propulsion mechanism, including a switchgear body 1 and a trolley-type circuit breaker 2 slidably installed in the central cavity of the switchgear body 1. The moving contact of the trolley-type circuit breaker 2 adopts a staggered contact 21, which moves synchronously with the trolley-type circuit breaker 2 and achieves electrical connection with the corresponding stationary contact in the switchgear body 1 by breaking. It also includes a contact compensation and adjustment assembly 4, wherein the contact compensation and adjustment assembly 4 includes: a sleeve shell 41, which is made of insulating material and sleeves and covers the outside of the staggered contact 21, and forms a hollow cavity inside to compensate for the contact. The remaining components of the compensation adjustment assembly 4 provide an assembly and mounting base. The spring pressure rod 42, which matches the number of contact pieces of the plum blossom contact 21, is slidably mounted on the end of the sleeve housing 41 through an elastic element, and the spring pressure rod 42 is correspondingly connected to the contact pieces of the plum blossom contact 21. The monitoring ring 43 is slidably mounted in the hollow cavity inside the sleeve housing 41 through an elastic element. The end face of the monitoring ring 43 facing each spring pressure rod 42 and the end of the spring pressure rod 42 extending towards the monitoring ring 43 form a wedge-face mating structure. The displacement sensor 45 is mounted on the outer wall of the sleeve housing 41 to monitor the displacement of the monitoring ring 43.

[0053] Among them, reference Figure 5 and Figure 6 As shown, the switchgear mainly relies on the contact compensation and adjustment component 4 to compensate for the misalignment defect caused by the assembly deviation between the moving contact and the stationary contact. When a slight positional deviation occurs, during the feeding process of the plum blossom contact 21 of the handcart-type circuit breaker, its central axis cannot coincide with the axis of the stationary contact; the plum blossom contact 21 is limited by the stationary contact, and some of the contact pieces are pushed outward. Under the linkage action of the plum blossom contact 21, the spring pressure rod 42 moves synchronously away from the axis of the plum blossom contact 21, and drives the monitoring ring 43 to slide along the first direction through the wedge surface transmission structure. The displacement sensor 45 mounted on the sleeve housing 41 collects the displacement information of the monitoring ring 43 in real time and converts the displacement into an electrical signal and transmits it to the external controller; the external controller outputs control commands based on the received displacement feedback signal to drive the hydraulic drive ring 44 to produce corresponding displacement actions.

[0054] In some embodiments, the hydraulic drive ring 44 is limited and slidably assembled in the hollow cavity of the sleeve housing 41. The hydraulic drive ring 44 drives the spring rod 42 to move along the axial direction of the plum blossom contact 21 by reciprocating back and forth sliding. The liquid drive circulation assembly 5 is assembled and fixed to the handcart circuit breaker 2 to drive the hydraulic drive ring 44 to perform back and forth sliding action.

[0055] Among them, reference Figure 4 and Figure 9 As shown, the external controller outputs control commands based on the received displacement feedback signal, regulates the liquid drive circulation component 5 to perform the medium injection action, and then drives the hydraulic drive ring 44 to produce corresponding sliding.

[0056] In some embodiments, reference Figure 9 and Figure 10 As shown, the liquid-driven circulation assembly 5 includes: several throttling three-way valves 52, respectively assembled on the outer wall of each sleeve housing 41. The throttling three-way valves 52 are connected to the corresponding liquid chamber at the rear end of the hydraulic drive ring 44, and each throttling three-way valve 52 is connected to the circulation pipe assembly 51 to achieve pipeline interconnection. The throttling three-way valves 52 are used to regulate the fluid flow state to ensure that the liquid chambers corresponding to each sleeve housing 41 can complete the liquid injection and suction actions at a uniform speed; the circulation pipe assembly 51 is composed of multiple pipes, including straight pipes and bends. The straight pipes are used to connect multiple sets of throttling three-way valves 52 at the same height in series, and the bends are used to connect multiple sets of throttling three-way valves 52 at different heights; and a hydraulic source is connected to each throttling three-way valve 52 via the circulation pipe assembly 51. By drawing or injecting liquid into the liquid chamber at the rear end of the hydraulic drive ring 44, the sliding drive of the hydraulic drive ring 44 is realized.

[0057] Among them, reference Figure 10 As shown, the hydraulic source outputs a quantitative liquid medium, which is then transported to each socket housing 41 via the circulation pipe assembly 51. Before entering the socket housing 41, the liquid medium is regulated by the flow distribution through each throttling three-way valve 52. Due to the difference in the offset of each set of plum blossom contacts 21, the required volume of liquid medium to be supplied is different. The throttling three-way valve 52 can accurately distribute the medium flow rate, ensuring that the quantitative liquid medium is directionally delivered to the corresponding socket housing 41 that needs to be regulated.

[0058] In some embodiments, reference Figure 3 As shown, the spring rod 42 consists of a rod head connected to the plum blossom contact 21 and a rod body segment connected to the rod head via an elastic element. The rod body segment of the spring rod 42 extends rearward, and the elastic element connecting the two sections of the spring rod 42 has a greater elastic coefficient than the elastic element that mates with the sleeve housing 41 and the spring rod 42. This causes the elastic element between the sleeve housing 41 and the spring rod 42 to deform preferentially under pressure. The rod head of the spring rod 42 protrudes outward, and the outer edge of the plum blossom contact 21 has a groove that matches the protrusion. The rod head of the spring rod 42 is snapped into the groove of the plum blossom contact 21.

[0059] The spring rod 42 adopts a snap-fit ​​design, which allows for quick assembly and disassembly of the plum blossom contact 21 during assembly and maintenance. By configuring two sets of elastic elements with different stiffnesses, the high-stiffness elastic element connecting the two sections of the spring rod 42 is not prone to compression deformation during the compression action of the spring rod 42, thus avoiding the failure of the spring rod 42 to control the contact piece due to deformation of the elastic element. At the same time, it can also prevent damage to the contact piece from excessive pushing force.

[0060] In some embodiments, the section of the spring rod 42 extending toward the monitoring ring 43 is provided with a diamond-shaped slot, and the diamond-shaped slot is inclined toward the hydraulic drive ring 44; the hydraulic drive ring 44 is provided with a plurality of rods extending toward the spring rod 42, and rollers are mounted on the rods. The rollers form a rolling fit with the diamond-shaped slot of the spring rod 42, and the rollers drive the spring rod 42 to slide radially by pressing against the upper and lower walls of the diamond-shaped slot; the rollers on the hydraulic drive ring 44 are arranged at the center of the diamond-shaped slot of the spring rod 42, and the rollers maintain a distance from the upper and lower edges of the diamond-shaped slot, with the distance ranging from 1 mm to 3 mm;

[0061] Among them, reference Figure 7 , Figure 8 and Figure 11 As shown, during the sliding process of the hydraulic drive ring 44, the outwardly extending roller on it drives the spring pressure rod 42 to move towards the axis of the stationary contact through the diamond-shaped slot, thereby ensuring that the contact piece can fit the stationary contact. The gap reserved between the roller and the diamond-shaped slot can adapt to the different fitting states of the contact pieces, so that each contact piece is subjected to uniform force and can reliably fit the stationary contact.

[0062] In a preferred embodiment, taking a contact-to-axis distance of 25mm as an example, the gap between the roller and the upper and lower edges of the diamond-shaped slot is set to 2mm. This takes into account the uniform driving characteristics of all spring rods 42, providing differentiated compensation strokes for contacts with different degrees of offset, and enabling synchronous adaptive centering of multiple groups of contacts. Simultaneously, from the perspective of overall machine structure coordination, it avoids the problems of insufficient adjustment margin due to excessively small gaps and individual contacts exceeding their adjustment range due to excessively large gaps, ensuring balanced force on all contacts and preventing local overload deformation. Before the hydraulic drive ring 44 drives the spring rods 42, some spring rods 42 are offset away from the axis by the static contact, reducing the distance between the lower edge of the diamond-shaped slot and the roller corresponding to the offset spring rod 42. When the hydraulic drive ring 44 slides forward, this part of the spring rod 42 can obtain a larger adjustment stroke.

[0063] When there is a deviation in the centering of the plum blossom contact feed, the side wall of the stationary contact pushes part of the contact piece laterally, causing the contact piece to tilt and deflect. The contact surface of the contact piece cannot fully fit the stationary contact, and only a local area at the edge makes contact, resulting in a reduction in the effective contact area of ​​the contact. The wedge transmission gives the offset side spring rod a larger downward stroke and clamping force, driving the tilted contact piece to correct its posture and restore a full contact state. At the same time, it balances the clamping amount of all contact pieces to prevent the non-offset contact pieces from having a poor connection due to insufficient load distribution.

[0064] In some embodiments, reference Figure 9As shown, the hydraulic source includes: a liquid storage tank 53, which is externally mounted and used to store liquid medium that can drive the sliding motion of the hydraulic drive ring 44; a circulation pump 54, which is mounted on the outside of the liquid storage tank 53 and electrically connected to the monitoring ring 43, for injecting liquid medium into the circulation pipe assembly 51; and a piston assembly 55, which is installed below the liquid storage tank 53 and used to push the liquid medium into the circulation pipe assembly 51.

[0065] The hydraulic power source has two liquid drive modes: Under normal adjustment conditions, the circulating pump 54 receives control commands from the external controller and quantitatively delivers liquid medium to the circulating pipe assembly 51 to achieve fine compensation adjustment of the contact position; when the handcart circuit breaker experiences a short circuit or other abnormal operating conditions, the piston assembly 55 starts quickly, driving all the liquid medium in the pipeline back to the storage tank 53. The hydraulic drive ring 44 is reset accordingly, and all spring rods 42 are simultaneously removed and moved away from the stationary contact, quickly releasing the spring rods from the contact plate, avoiding the contact from continuously bearing additional mechanical loads under short circuit and high current conditions, reducing the risk of contact erosion, jamming and adhesion, and improving the safety of equipment operation.

[0066] In some embodiments, reference Figure 8 and Figure 10 As shown, the displacement sensor 45 is configured with at least two detection threshold points. The first threshold point corresponds to the first displacement stroke of the monitoring ring 43 and is used to detect the translational deviation of the plum blossom contact 21 relative to the stationary contact. Under this condition, correction intervention is required. The displacement threshold is between 0.3 and 0.9 mm. The second threshold point corresponds to the second displacement stroke of the monitoring ring 43 and is used to detect the track offset fault of the handcart circuit breaker 2. The displacement threshold is greater than 1.2 mm.

[0067] In a preferred embodiment, taking a first threshold value of 0.6 mm as an example, when the sliding amount of the monitoring ring 43 reaches 0.6 mm, it is determined that the plum blossom contact 21 and the stationary contact have a slight misalignment. The external controller starts the contact automatic compensation process and regulates the liquid drive circulation component 5 to drive the hydraulic drive ring 44 to complete the position correction.

[0068] In a preferred embodiment, taking a second threshold value of 1.5mm as an example, when the slippage of the monitoring ring 43 reaches 1.5mm, it is determined that the track offset of the handcart circuit breaker 2 exceeds the compensation adjustment range, the system triggers an alarm and stops the contact feeding, prompting the maintenance personnel to readjust the handcart circuit breaker 2.

[0069] In some embodiments, reference Figure 9As shown, the switchgear body 1 and the handcart-type circuit breaker 2 are also equipped with a magnetic guide rail assembly 3 for cooperative use. The magnetic guide rail assembly 3 includes a moving magnetic rail unit and a fixed magnetic rail unit. The moving magnetic rail units are respectively installed on both sides of the handcart-type circuit breaker 2, and the fixed magnetic rail units are fixedly arranged on the inner side wall of the switchgear body 1. The moving magnetic rail units and the fixed magnetic rail units are arranged opposite to each other and cooperate with each other. The magnetic guide rail assembly 3 relies on the magnetic force generated between the two to realize the feed movement of the handcart-type circuit breaker 2.

[0070] The magnetic guide rail assembly 3 relies on the magnetic force generated between the two to realize the feeding movement of the handcart circuit breaker 2. It mainly adopts a non-contact magnetic drive method, with low frictional resistance and no mechanical wear during operation. This can reduce the vibration and position disturbance generated during the feeding process of the handcart and reduce the initial alignment deviation when the plum blossom contact 21 is fed and connected. At the same time, the feeding action is smooth and controllable, which is convenient to cooperate with the contact compensation and adjustment assembly 4 to achieve deviation coordination correction and improve the coaxiality of the connection between the moving and stationary contacts.

[0071] In a preferred embodiment, the piston assembly 55 can be linked and adapted with the five-proof interlocking mechanism built into the switchgear to realize the passive interlocking trigger and medium rapid pressure relief and reset functions under short-circuit fault conditions. The drive end of the piston assembly 55 is rigidly connected to the circuit breaker tripping and unlocking component of the five-proof interlocking mechanism through the transmission link. At the same time, the five-proof interlocking mechanism is equipped with a short-circuit fault detection linkage contact, which is electrically connected to the short-circuit fault monitoring module of the switchgear. When a short-circuit fault occurs during equipment operation, the system instantly detects the fault large current and prioritizes triggering the circuit breaker to quickly trip and disconnect. At the same time, the short-circuit fault signal is transmitted to the five-proof interlocking mechanism to release the double locking state of the handcart feed lock and tripping lock, and complete the five-proof interlocking unlocking action.

[0072] At the same time, the internal mechanical linkage group is displaced and transmitted, directly pushing and triggering the start switch of the piston assembly 55, driving the piston structure inside the piston assembly 55 to quickly descend and squeeze the medium inside the liquid storage tank 53, forcing all the liquid medium in the corresponding liquid chambers of the circulation pipe assembly 51 and the hydraulic drive ring 44 to quickly flow back to the liquid storage tank 53.

[0073] Relying on the inherent mechanical linkage characteristics of the switchgear's five-proof interlocking mechanism, there is no need to add an independent electrical control triggering module. It has a high degree of structural integration and a low failure rate. It can achieve synchronous action of short circuit power failure, interlocking unlocking, piston depressurization, and contact depressurization in one unit. The response speed is extremely fast, and the contact clamping constraint can be released in milliseconds.

[0074] In another preferred embodiment, the start-up control of the piston assembly 55 can also be linked with the cabinet magnetic rail assembly 3. When the switchgear detects a short-circuit fault signal, it immediately cuts off the forward feed magnetic current of the magnetic rail assembly 3, and simultaneously reverses the braking and retraction current, driving the moving magnetic rail unit and the stationary magnetic rail unit to generate a reverse repulsive force, causing the handcart circuit breaker 2 to slide outward at a uniform speed along the cabinet track, achieving rapid physical separation of the moving and stationary contacts. During the initial displacement stage of the handcart circuit breaker 2 sliding outward, the displacement sensing contact of the magnetic rail assembly 3 closes instantaneously, synchronously outputting a trigger signal to the piston assembly 55, immediately initiating the piston compression and pressure relief action. The piston assembly 55, through linkage with the cabinet magnetic rail assembly 3, possesses high coordination and fault tolerance.

[0075] Working Principle: During operation, the magnetic guide rail assembly 3 drives the trolley circuit breaker 2 to move smoothly along the switchgear body 1 using the magnetic force between the moving magnetic rail unit and the fixed magnetic rail unit in a non-contact manner. This non-contact drive reduces friction, suppresses vibration disturbance, and lowers the initial coaxial deviation between the plum blossom contact 21 and the stationary contact before docking. During the trolley's feeding and docking process, if there is a slight misalignment between the central axis of the plum blossom contact 21 and the axis of the stationary contact, the sidewall of the stationary contact will laterally push a portion of the contact piece of the plum blossom contact 21, causing the contact piece to tilt and deflect. Only a localized area of ​​the contact piece will contact the stationary contact, reducing the effective contact area. Due to the linkage of the contact piece, the corresponding spring rod 42 simultaneously moves away from the axis of the plum blossom contact 21, and through wedge-face transmission, drives the monitoring ring 43 to slide.

[0076] The displacement sensor 45, mounted on the outside of the sleeve housing 41, collects the displacement signal of the monitoring ring 43 in real time and converts it into an electrical signal to be transmitted to the external controller. The displacement sensor 45 has a built-in two-level displacement threshold judgment logic: when the displacement reaches the first threshold, the system determines that there is a slight translational deviation between the plum blossom contact 21 and the stationary contact, and starts the automatic compensation process; when the displacement exceeds the second threshold, it determines that the track offset of the handcart circuit breaker 2 exceeds the compensation adjustment limit, the system triggers an alarm and stops feeding, and reminds the operation and maintenance personnel to readjust the position.

[0077] The external controller sends control commands to the liquid-driven circulation assembly 5 based on the feedback electrical signal. The hydraulic source outputs liquid medium, which is transported through the circulation pipe assembly 51. Each throttling three-way valve 52 achieves fluid diversion and precise flow control, and injects medium into the corresponding sleeve housing 41 internal liquid chamber according to the different offsets of each set of plum blossom contacts 21, pushing the hydraulic drive ring 44 to slide back and forth. The roller on the hydraulic drive ring 44 is arranged at the center of the diamond-shaped slot of the spring pressure rod 42, with a gap reserved between the roller and the upper and lower edges of the diamond-shaped slot. This gap is adapted to the overall machine's coordinated adjustment requirements, and can allocate differentiated adjustment strokes for spring pressure rods 42 with different degrees of offset. The gap between the lower edge of the diamond-shaped slot of the offset spring pressure rod 42 and the roller is smaller, which can obtain a larger radial adjustment stroke and clamping force, driving the tilted contact to reset and straighten, increasing the effective contact area of ​​the contact, and at the same time balancing the clamping load of all contact pieces to avoid the non-offset contact pieces from having a loose connection.

[0078] The spring rod 42 adopts a snap-fit ​​structure to achieve quick disassembly and maintenance. Two sets of elastic elements with different stiffness form a load constraint, ensuring that only the elastic element between the sleeve shell 41 and the spring rod 42 deforms first, preventing the high-stiffness elastic element connecting the two sections of the spring rod 42 from failing under pressure, while avoiding damage to the contact plate by excessive clamping force.

[0079] Under normal compensation conditions, the circulating pump 54 delivers a quantitative medium to complete the fine contact centering adjustment. When the system detects a serious fault such as a short circuit, the piston assembly 55 moves quickly, driving all the medium in the pipeline to flow back to the storage tank 53. The hydraulic drive ring 44 quickly resets, and all the spring rods 42 simultaneously retract from the stationary contact, releasing the additional clamping load on the contact piece. This avoids the risk of burning and adhesion caused by continuous pressure on the contact under short-circuit high-current conditions, and improves the reliability of equipment operation.

[0080] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A trolley-type high-voltage switchgear with a propulsion mechanism, comprising a switchgear body (1) and a trolley-type circuit breaker (2) slidably mounted in the central cavity of the switchgear body (1), wherein the moving contact portion of the trolley-type circuit breaker (2) adopts a staggered contact (21), which moves synchronously with the trolley-type circuit breaker (2) and achieves electrical connection with the corresponding stationary contact within the switchgear body (1) through disconnection, characterized in that, It also includes a contact compensation adjustment assembly (4), wherein the contact compensation adjustment assembly (4) includes: The outer shell (41) is made of insulating material and is sleeved and covered on the outside of the plum blossom contact (21). The hollow cavity inside provides an assembly and installation base for the other parts of the contact compensation and adjustment assembly (4). A spring rod (42) matching the number of contact pieces of the plum blossom contact (21) is slidably mounted on the end of the sleeve housing (41) via an elastic element, and the spring rod (42) is connected to the contact pieces of the plum blossom contact (21). The monitoring ring (43) is slidably fitted into the hollow cavity inside the sleeve shell (41) by means of an elastic element. The end face of the monitoring ring (43) facing each spring rod (42) and the end of the spring rod (42) extending toward the monitoring ring (43) form a wedge-shaped mating structure. A displacement sensor (45) is mounted on the outer wall of the sleeve housing (41) to monitor the displacement of the monitoring ring (43); The hydraulic drive ring (44) is slidably mounted in the hollow cavity of the sleeve shell (41), wherein the hydraulic drive ring (44) drives the spring rod (42) to move along the axial direction of the plum blossom contact (21) by reciprocating back and forth. The liquid-driven circulation assembly (5) is mounted and fixed to the handcart-type circuit breaker (2) to drive the hydraulic drive ring (44) to slide back and forth.

2. A handcart-type high-voltage switchgear with a propulsion mechanism according to claim 1, characterized in that, The spring rod (42) consists of a rod head connected to the plum blossom contact (21) and a rod body segment connected to the rod head via an elastic element; The rod section of the spring rod (42) extends to the rear side, and the elastic element connecting the two sections of the spring rod (42) has a greater elastic coefficient than the elastic element that matches the sleeve shell (41) and the spring rod (42), so that under pressure, the elastic element between the sleeve shell (41) and the spring rod (42) will deform preferentially.

3. A handcart-type high-voltage switchgear with a propulsion mechanism according to claim 2, characterized in that, The spring rod (42) has a protruding head that protrudes outward. The outer edge of the plum blossom contact (21) has a groove that matches the protrusion. The spring rod (42) is snapped into the groove of the plum blossom contact (21).

4. A handcart-type high-voltage switchgear with a propulsion mechanism according to claim 1, characterized in that, The section of the spring rod (42) extending toward the monitoring ring (43) is provided with a diamond-shaped slot, and the diamond-shaped slot is arranged at an angle toward the hydraulic drive ring (44). The hydraulic drive ring (44) is provided with a number of rods extending toward the spring rod (42). Rollers are mounted on the rods. The rollers form a rolling fit with the diamond-shaped slot of the spring rod (42). The rollers drive the spring rod (42) to slide radially by pressing against the upper and lower walls of the diamond-shaped slot.

5. A handcart-type high-voltage switchgear with a propulsion mechanism according to claim 1, characterized in that, The rollers on the hydraulic drive ring (44) are arranged at the center of the rhomboid slot of the spring pressure rod (42). The rollers maintain a distance from the upper and lower edges of the rhomboid slot, with the distance ranging from 1 mm to 3 mm.

6. A handcart-type high-voltage switchgear with a propulsion mechanism according to claim 1, characterized in that, The liquid-driven circulation assembly (5) includes: Several throttling three-way valves (52) are respectively assembled on the outer wall of each sleeve housing (41). The throttling three-way valves (52) are connected to the corresponding liquid chamber at the rear end of the hydraulic drive ring (44). Each throttling three-way valve (52) is connected to the circulation pipe assembly (51) to realize pipeline interconnection. The throttling three-way valves (52) are used to regulate the fluid flow state to ensure that the liquid chambers corresponding to each sleeve housing (41) can complete the liquid injection and suction actions at a uniform speed. The circulation pipe kit (51) is composed of multiple pipes. The circulation pipe kit (51) includes straight pipes and bends. The straight pipes are used to connect multiple sets of throttling three-way valves (52) at the same height in series, and the bends are used to connect multiple sets of throttling three-way valves (52) at different heights. The hydraulic power source is connected to each throttling three-way valve (52) via the circulation pipe assembly (51). By drawing or injecting liquid into the liquid chamber at the rear end of the hydraulic drive ring (44), the hydraulic drive ring (44) is slidably driven.

7. A handcart-type high-voltage switchgear with a propulsion mechanism according to claim 6, characterized in that, The hydraulic source includes: The liquid storage tank (53) is externally mounted and is used to store the liquid medium that can drive the sliding motion of the hydraulic drive ring (44); A circulation pump (54) is mounted on the outside of the storage tank (53). The circulation pump (54) is electrically connected to the monitoring ring (43) for injecting liquid medium into the circulation tube assembly (51). The piston assembly (55) is installed below the reservoir (53) and is used to push the liquid medium into the circulation tube assembly (51).

8. A handcart-type high-voltage switchgear with a propulsion mechanism according to claim 1, characterized in that, The displacement sensor (45) is configured with at least two detection threshold points, wherein the first threshold point corresponds to the first displacement stroke of the monitoring ring (43) and is used to detect the translational deviation of the plum blossom contact (21) relative to the stationary contact; the second threshold point corresponds to the second displacement stroke of the monitoring ring (43) and is used to detect the track offset fault of the handcart circuit breaker (2).

9. A handcart-type high-voltage switchgear with a propulsion mechanism according to claim 1, characterized in that, The switch cabinet body (1) and the handcart-type circuit breaker (2) are also equipped with a magnetic guide rail assembly (3) for use in conjunction with each other. The magnetic guide rail assembly (3) includes a moving magnetic rail unit and a fixed magnetic rail unit. The moving magnetic rail units are respectively installed on both sides of the handcart circuit breaker (2), and the fixed magnetic rail units are fixedly arranged on the inner side wall of the switch cabinet body (1). The moving magnetic rail units and the fixed magnetic rail units are arranged opposite to each other and cooperate with each other. The magnetic guide rail assembly (3) relies on the magnetic force generated between the two to realize the feeding movement of the handcart circuit breaker (2).

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