Monitoring mechanism for multifunctional handcart of switch cabinet

Abstract

The utility model discloses a monitoring mechanism for a multifunctional handcart of a switch cabinet, which comprises a handcart supporting plate which is horizontally arranged, a box body which is arranged on the lower plate surface of the handcart supporting plate and at least two auxiliary switches which are arranged in the box body side by side, and each auxiliary switch is composed of a plurality of normally open / normally closed nodes. The plurality of auxiliary switches receive the contact pressure of the chassis of the handcart at the same time, so that the plurality of normally-open / normally-closed nodes generate electric signals and transmit the electric signals to the monitoring modules. Two auxiliary switches are arranged on a handcart push-in path, synchronous triggering can be ensured when the handcart is completely in place by touching and pressing the auxiliary switches through a chassis truck, accurate monitoring of the position of the multifunctional handcart can be realized by transmitting signals to each monitoring point in a switch cabinet through the two auxiliary switches and node signals of the two auxiliary switches, meanwhile, the structural design is simplified, and the cost is reduced. The reliability is improved.

Description

Technical Field

[0001] This utility model relates to a monitoring mechanism for a multi-functional handcart for switchgear. Background Technology

[0002] In medium-voltage power distribution systems, multi-functional handcarts (circuit breaker carts, isolating carts, and grounding carts) are essential components of switchgear as electrical protection devices. Monitoring the working position of multi-functional handcarts primarily relies on mechanical indicators or simple electrical signal feedback. Common solutions include the following four:

[0003] Mechanical position indication: This method uses physical structures such as mechanical linkages, limit baffles, or spring contacts to indicate the position of the grounding vehicle through mechanical linkage. Some solutions use mechanical markers (such as red / green indicator signs) for manual judgment of whether the grounding vehicle is in place. However, this solution has the following drawbacks: ① It relies on manual observation, which is prone to misjudgment; ② Mechanical parts are prone to wear, and accuracy decreases after long-term use; ③ It cannot be remotely monitored or automatically controlled.

[0004] Single microswitch detection: One or two microswitches (or limit switches) are installed along the circuit breaker carriage's path. When the circuit breaker carriage reaches its position, the switch is pressed, outputting an electrical signal. This signal is typically used to drive indicator lights or relays, providing simple electrical feedback. For example, Chinese patent CN202220412474 proposes arranging two limit switches along the circuit breaker carriage path to determine the circuit breaker's test and operating positions. However, this approach has several drawbacks: ① Single-point detection may lead to misjudgments due to switch malfunction or accidental activation (e.g., the carriage is not fully in position but the signal has already been triggered); ② The signal transmission is limited and cannot meet complex monitoring needs (e.g., multi-node interlocking).

[0005] Proximity sensor detection: Non-contact sensors (such as inductive, photoelectric, or Hall effect sensors) are used to detect the position of the grounding vehicle; the signal is processed by a PLC or intelligent controller to achieve remote monitoring or automated interlocking. However, this solution has the following drawbacks: ① Higher cost, requiring additional power supply and signal processing circuitry; ② High installation accuracy requirements, and may be affected by electromagnetic interference.

[0006] Multi-node interlocking detection: This method uses a combination of multiple switches or sensors, and improves detection reliability through logical judgments (such as "AND" and "OR" relationships). However, the drawback of this scheme is that the structure is slightly complex and the switch positions need to be arranged reasonably.

[0007] Overall, existing technical solutions are not reliable enough. Mechanical or single-point detection is susceptible to wear or accidental touches. They are also limited in function, with most solutions providing only simple indications and lacking multi-signal interlocking or remote monitoring capabilities. Furthermore, there is a contradiction between cost and complexity, with high-reliability solutions (such as sensor + PLC) being expensive, while low-cost solutions (such as mechanical ones) are unreliable. Utility Model Content

[0008] The purpose of this utility model is to provide a monitoring mechanism for a multi-functional handcart of a switchgear that is simple in structure, low in cost, highly reliable, versatile, and capable of functional expansion.

[0009] The purpose of this utility model is achieved through the following technical measures: a monitoring mechanism for a multi-functional handcart of a switch cabinet, characterized in that it includes a horizontally arranged handcart support plate, a box set on the lower surface of the handcart support plate, and at least two auxiliary switches installed side by side in the box. Each auxiliary switch consists of multiple normally open / normally closed nodes. The multiple auxiliary switches simultaneously receive the chassis pressure of the handcart, causing the multiple normally open / normally closed nodes to generate electrical signals and transmit the electrical signals to each monitoring module.

[0010] This invention arranges two auxiliary switches along the trolley's pushing path. By pressing the auxiliary switches on the chassis, synchronous triggering can be ensured when the trolley is fully in position. The signals from the two auxiliary switches and their nodes are transmitted to various monitoring points in the switch cabinet, enabling accurate monitoring of the trolley's position while simplifying the structural design and improving reliability.

[0011] In one embodiment of this utility model, the auxiliary switch is vertically mounted on the side wall of the housing. A groove-shaped sealing plate for sealing the top surface of the housing is provided on the handcart support plate. The sealing plate has an opening, and the roller at the upper end of the auxiliary switch protrudes above the sealing plate through the opening. A handcart switch travel pressure plate is provided on the bottom surface of the chassis. When the handcart switch travel pressure plate touches the roller during travel, the normally open / normally closed node of the auxiliary switch generates an electrical signal.

[0012] The housing of this utility model is rectangular. The auxiliary switch is installed on the back plate of the housing. The back plate has folded edges on both sides. Multiple vertical elongated holes are arranged in parallel along the vertical direction on the folded edges. Multiple horizontal elongated holes are arranged in parallel along the vertical direction on the edges of the two side plates. After the connector passes through the vertical elongated holes and the horizontal elongated holes and is adjusted into place, it is fixed to connect the back plate and the two side plates.

[0013] In another embodiment of this utility model, the auxiliary switch is horizontally arranged on the top plate of the housing along the front-to-back direction. The top plate of the housing is installed on the lower plate surface of the handcart tray, forming a space between them for slidably installing the push plate. An opening is provided on the handcart tray. The push plate consists of a horizontal plate, an upper vertical plate located at the rear end of the horizontal plate, and a lower vertical plate located at the front end of the horizontal plate. The upper vertical plate extends upward beyond the opening. The roller of the auxiliary switch is located outside the housing. The chassis of the handcart moves backward to push the upper vertical plate, which in turn moves the lower vertical plate backward to press the roller, thereby generating an electrical signal at the normally open / normally closed contact of the auxiliary switch.

[0014] The top plate of the box body of this utility model is a box-shaped part with fixed folded edges on both sides. The front and rear sides of the top plate are provided with notches for the push plate to pass through. The fixed folded edges are provided with elongated fixing holes. After the connecting piece passes through the elongated fixing holes and is adjusted into place, the top plate is fixed and installed on the handcart tray.

[0015] The monitoring module of this utility model includes a visual status indication module, an interlocking control module, and a remote monitoring module.

[0016] The handcart described in this utility model is a grounding handcart, an isolation handcart, or a circuit breaker handcart.

[0017] Compared with the prior art, the present invention has the following significant advantages:

[0018] (1) This utility model uses redundant detection with dual auxiliary switches. The system is only considered to be in place when both auxiliary switches are pressed simultaneously, thus avoiding single-point failure. Compared with existing single-point detection, the false judgment rate is reduced by 90%, thereby greatly improving reliability.

[0019] (2) This utility model reduces the cost by 60% compared to the existing sensor + PLC solution, which greatly saves costs.

[0020] (3) This utility model supports interlocking, remote monitoring, etc. for multi-node signals, which can meet the needs of intelligent power distribution cabinets and realize functional expansion.

[0021] (4) This utility model is compatible with various handcarts such as grounding car, isolation handcart, and circuit breaker car, and has strong versatility.

[0022] (5) The auxiliary switch used in this utility model is an existing product and belongs to mature switching components. It does not require a PLC or complex sensors, so the cost is low. Attached Figure Description

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0024] Figure 1 This is a top view of Embodiment 1 of this utility model;

[0025] Figure 2 This is a left view of embodiment 1 of the utility model;

[0026] Figure 3 This is a front view of Embodiment 1 of this utility model;

[0027] Figure 4 This is a top view of Embodiment 2 of this utility model;

[0028] Figure 5 It is along Figure 4 Sectional view of line AA in the middle;

[0029] Figure 6 This is a bottom view of Embodiment 2 of this utility model;

[0030] Figure 7 This is a flowchart of the monitoring signal transmission path applicable to circuit breaker trolleys according to this utility model;

[0031] Figure 8 This is a flowchart of the monitoring signal transmission path applicable to the isolation handcart of this utility model;

[0032] Figure 9 This is a flowchart of the monitoring signal transmission path applicable to the grounding handcart of this utility model.

[0033] In the diagram: 1-Handcart support plate; 2-Box body; 3-Auxiliary switch; 4-Sealing plate; 5-Roller; 6-Handcart switch travel pressure plate; 7-Rear plate; 8-Vertical elongated hole; 9-Horizontal elongated hole; 10-Push plate; 11-Upper vertical plate; 12-Lower vertical plate; 13-Horizontal plate; 14-Opening; 15-Top plate; 16-Elongated fixing hole. Detailed Implementation

[0034] Example 1

[0035] like Figures 1-3 As shown, this utility model discloses a monitoring mechanism for a multi-functional handcart in a switch cabinet. It includes a horizontally arranged handcart support plate 1, a housing 2 disposed on the lower surface of the handcart support plate 1, and two auxiliary switches 3 (the auxiliary switches 3 are existing products, manufactured by Xingji Electric Group Co., Ltd., auxiliary switch FK10-I-55) installed side by side in the housing 2. Each auxiliary switch 3 consists of multiple normally open / normally closed nodes. When the two auxiliary switches 3 are simultaneously pressed by the chassis of the handcart, the multiple normally open / normally closed nodes generate electrical signals and transmit the electrical signals to each monitoring module.

[0036] The auxiliary switch 3 is vertically mounted on the side wall of the housing 2. A grooved sealing plate 4 for sealing the top surface of the housing 2 is provided on the handcart pallet 1. The sealing plate 4 has an opening. The roller 5 at the upper end of the auxiliary switch 3 protrudes above the sealing plate 4 through the opening. A handcart switch travel pressure plate 6 is provided on the bottom surface of the chassis. When the handcart switch travel pressure plate 6 touches the roller 5 during movement, it causes the normally open / normally closed node of the auxiliary switch 3 to generate an electrical signal. The handcart switch travel pressure plate 6 first touches one end of the roller, which has a slope, so that the handcart switch travel pressure plate 6 can move smoothly to complete the contact with the roller.

[0037] In this embodiment, the housing 2 is a rectangular body, and the auxiliary switch 3 is installed on the rear plate 7 of the housing 2. The rear plate 7 has folded edges on both sides, and multiple vertical elongated holes 8 are arranged in parallel along the vertical direction on the folded edges. Multiple horizontal elongated holes 9 are arranged in parallel along the vertical direction on the edges of the two side plates. After adjusting the position by passing bolts through the vertical elongated holes and the horizontal elongated holes, the rear plate 7 and the two side plates are fixed to connect them.

[0038] The advantages of this embodiment are: the enclosure has a large space, and the auxiliary switch is vertical, making it convenient for operators to wire / maintain the circuit breaker. The travel pressure plate of the handcart switch has a certain guiding effect on the circuit breaker chassis (the chassis itself has guide rails, and the guiding effect is only enhanced).

[0039] Each auxiliary switch contains multiple normally open / normally closed nodes, and the signals are routed to: ① status indicator lights (local visualization); ② interlocking modules (such as interlocking between the isolation trolley and the circuit breaker); ③ remote monitoring system (SCADA).

[0040] In this embodiment, the handcart is a grounding handcart. The handcart can also be an isolating handcart or a circuit breaker handcart. The arrangement and number of auxiliary switches can be dynamically adjusted according to the handcart type. By adjusting the switch arrangement and node definitions, different handcart requirements can be adapted: ① Grounding handcart: Double switches double-confirm grounding status; ② Isolating handcart: Add a third switch to detect contact separation; ③ Circuit breaker handcart: Optionally add a third switch and connect it to the protection circuit.

[0041] The handcart pallet of this utility model separates the handcart compartment and the front lower compartment, forming a sealed space inside the box to meet safety requirements.

[0042] For example Figure 7 The diagram shown is an example of the signal transmission path for circuit breaker trolley monitoring. When the circuit breaker trolley is in the working position, the chassis is pushed forward, the auxiliary switch is pressed, and the monitoring signal is transmitted to the interlocking control module, the status indicator (showing red, indicating a live danger warning), and the remote monitoring system. The interlocking control module de-energizes and locks the cabinet door electromagnetic lock (keeping the cabinet door closed to prevent personnel from accidentally entering the energized compartment), allows the circuit breaker to close, and locks the grounding switch to prevent closing. When the circuit breaker trolley is in the test position, the chassis is not pushed forward, and the auxiliary switch is not pressed. Since the auxiliary switch is still energized, the status indicator shows green (no power, safe). The interlocking control module energizes and opens the cabinet door electromagnetic lock (cabinet door allowed to open), allows the circuit breaker to open, and locks the grounding switch to allow closing.

[0043] Figure 8 This utility model is a flowchart of the monitoring signal transmission path for the isolation trolley. The specific process can be referred to the monitoring signal transmission path flowchart for the circuit breaker trolley. Figure 9 This utility model is a flowchart of the monitoring signal transmission path for grounding trolleys. The specific process can be referred to as the monitoring signal transmission path flowchart for circuit breaker trolleys.

[0044] The auxiliary switch is energized regardless of whether the circuit breaker is in the test or operating position. In the test position, the auxiliary switch is not touched; some contacts are energized, while others are open. When the auxiliary switch is touched in the operating position, the copper contacts inside move. Some contacts move downwards to disconnect, while others move downwards to connect.

[0045] Example 2

[0046] like Figures 4-6 As shown, the difference between this embodiment and embodiment 1 is that the auxiliary switch 3 is horizontally arranged on the top plate 15 of the housing 2 in the front-back direction. The top plate 15 of the housing 2 is installed on the lower plate surface of the handcart tray 1 and forms a space between the two for the sliding installation of the push plate 10. An opening 14 is provided on the handcart tray 1 (the length of the opening 14 meets the movement stroke of the upper vertical plate 11). The push plate 10 is composed of a horizontal plate 13, an upper vertical plate 11 located at the rear end of the horizontal plate 13, and a lower vertical plate 12 located at the front end of the horizontal plate 13. The upper vertical plate 11 extends upward out of the opening 14. The roller 5 of the auxiliary switch 3 is located outside the housing 2. The chassis of the handcart moves backward to push the upper vertical plate 11 to drive the lower vertical plate 12 to move backward to touch the roller 5, so that the normally open / normally closed node of the auxiliary switch 3 generates an electrical signal.

[0047] In this embodiment, the top plate 15 of the box body 2 is a box-shaped part with fixed folded edges on both sides. The front and rear sides of the top plate 15 are provided with notches for the push plate 10 to pass through. The fixed folded edges are provided with elongated fixing holes 16. After the bolts are passed through the elongated fixing holes 16 and adjusted into place, the top plate 15 is fixed and installed on the handcart tray 1.

[0048] Compared to Example 1, the auxiliary switch in this example is installed horizontally, which greatly saves material costs.

[0049] The embodiments of this utility model are not limited to this. Based on the above content of this utility model, and in accordance with the common technical knowledge and conventional means in the field, without departing from the basic technical idea of ​​this utility model, the position of the auxiliary switch in the box, the specific structure of the box installed on the handcart pallet, and the way the chassis touches the roller can also have other embodiments. Therefore, this utility model can be modified, replaced or changed in many other forms, all of which fall within the scope of protection of this utility model.

Claims

1. A monitoring mechanism for a multi-functional switchgear trolley, characterized in that: It includes a horizontally set handcart tray, a housing set on the lower surface of the handcart tray, and at least two auxiliary switches installed side by side in the housing. Each auxiliary switch consists of multiple normally open / normally closed nodes. Multiple auxiliary switches simultaneously receive the chassis pressure of the handcart, causing multiple normally open / normally closed nodes to generate electrical signals and transmit the electrical signals to each monitoring module.

2. The monitoring mechanism of the multi-functional switchgear trolley according to claim 1, characterized in that: The auxiliary switch is vertically mounted on the side wall of the housing. A grooved sealing plate for sealing the top surface of the housing is provided on the handcart support plate. The sealing plate has an opening, and the roller at the upper end of the auxiliary switch protrudes above the sealing plate through the opening. A handcart switch travel pressure plate is provided on the bottom surface of the chassis. When the handcart switch travel pressure plate touches the roller during travel, it causes the normally open / normally closed contact of the auxiliary switch to generate an electrical signal.

3. The monitoring mechanism of the multi-functional handcart for switchgear according to claim 2, characterized in that: The enclosure is rectangular. The auxiliary switch is mounted on the rear panel of the enclosure. The rear panel has folded edges on both sides. Multiple vertical elongated holes are arranged in parallel along the vertical direction on the folded edges. Multiple horizontal elongated holes are arranged in parallel along the vertical direction on the edges of the two side panels. After the connector passes through the vertical and horizontal elongated holes and is adjusted into position, it is fixed to connect the rear panel and the two side panels.

4. The monitoring mechanism of the multi-functional handcart for switchgear according to claim 1, characterized in that: The auxiliary switch is horizontally mounted on the top plate of the housing along the front-to-back direction. The top plate of the housing is mounted on the lower plate of the handcart tray, forming a space between them for the sliding installation of the push plate. An opening is provided on the handcart tray. The push plate consists of a horizontal plate, an upper vertical plate located at the rear end of the horizontal plate, and a lower vertical plate located at the front end of the horizontal plate. The upper vertical plate extends upward beyond the opening. The roller of the auxiliary switch is located outside the housing. The handcart chassis moves backward to push the upper vertical plate, which in turn moves the lower vertical plate backward to press the roller, thereby generating an electrical signal at the normally open / normally closed contact of the auxiliary switch.

5. The monitoring mechanism of the multi-functional handcart for switchgear according to claim 4, characterized in that: The top plate of the box is a box-shaped piece with fixed folded edges on both sides. The front and rear sides of the top plate are provided with notches for the push plate to pass through. The fixed folded edges are provided with elongated fixing holes. After the top plate is adjusted into place by the connector passing through the elongated fixing holes, it is fixed and installed on the handcart tray.

6. The monitoring mechanism of the multi-functional handcart for switchgear according to any one of claims 1 to 5, characterized in that: The monitoring module includes a visual status indication module, an interlocking control module, and a remote monitoring module.

7. The monitoring mechanism for the multi-functional switchgear trolley according to claim 6, characterized in that: The handcart is a grounding handcart, an isolating handcart, or a circuit breaker handcart.

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