A trolley type switch cabinet chassis car stroke position double confirmation device

Abstract

The application discloses a trolley type switch cabinet chassis trolley stroke position double confirmation device, which comprises a working position stroke switch, a test position stroke switch and a rolling bearing; the rolling bearing is located on a front baffle of a trolley; the working position stroke switch and the test position stroke switch are installed on a cabinet body of a switch cabinet and are located on one side of a movement track of the rolling bearing; the working position stroke switch and the test position stroke switch are both press type micro switches, and one end of a transmission assembly of each of the working position stroke switch and the test position stroke switch is provided with a roller; when the trolley is located at the test position, the rolling bearing is in abutment with the roller of the test position stroke switch; and when the trolley is located at the working position, the rolling bearing is in abutment with the roller of the working position stroke switch. The application has the advantages of simple and compact structure, simple and convenient installation and use, low cost, long service life and reliable action.

Description

Technical Field

[0001] This invention mainly relates to the field of switchgear technology, specifically to a dual confirmation device for the travel position of a trolley-type switchgear chassis. Background Technology

[0002] In recent years, the State Grid Corporation of China has vigorously promoted intelligent substations. Intelligent substations require intelligent switchgear to have a "one-click sequential control" operation function. "One-click sequential control" in intelligent substations refers to the advanced application function of intelligent substations utilizing the substation's sequential control capabilities. Common substation operations are programmed into operation module buttons on the intelligent substation's monitoring backend according to certain five-prevention logic. Operators do not need to create complex operation tickets; they only need to call the corresponding operation ticket based on the operation task name to complete the desired operation. "One-click sequential control" embeds numerous and tedious manual switching operation steps into a dedicated backend computer. By simply clicking the required "operation task" on the computer, a series of remote control operations can be automatically completed, and the computer can also automatically verify whether the operation is performed correctly. Previously, manually operating a 110 kV line to shut down or restore power took approximately 30 minutes. During this time, operators and supervisors had to repeatedly issue commands, repeat instructions, perform operations, and conduct on-site inspections, which was time-consuming and labor-intensive. Now, such an operation only requires clicking on an "operation task" on a computer. Within 5 minutes, the computer can remotely control all devices in a predetermined sequence, without the need for staff intervention. The application of "one-click sequential control" has not only significantly improved work efficiency but also greatly reduced power outage and restoration time, making a significant contribution to power supply reliability.

[0003] "One-click sequential control" has transformed substation switching operations from "manual item-by-item operation" to "remote automatic computer operation," which is conducive to comprehensively improving operational efficiency, reducing operational risks, and enhancing emergency response capabilities.

[0004] To reduce manual operation time, lower operator workload, and improve operator safety during switchgear operation, the State Grid Corporation of China has implemented a "one-click sequential control" operation mode, where computers automatically execute pre-defined programs. To achieve this, an electric chassis trolley is used within the switchgear to automatically move the circuit breaker (mounted on the trolley) between its working and test positions. To ensure the trolley (circuit breaker) reaches its designated position, both its working and test positions require double confirmation—the so-called "double confirmation" method. For intelligent switchgear to achieve "one-click sequential control," the following basic conditions must be met: 1. The circuit breaker uses an electric chassis trolley for automatic movement; 2. The circuit breaker's movement position is double-confirmed (the electric chassis itself can perform one position confirmation, but to improve reliability, other methods are used to confirm the circuit breaker's position again, ensuring safe remote execution of the program); 3. All equipment has high operational reliability and a long service life.

[0005] Existing intelligent switchgear has a dual-confirmation scheme for travel position. One scheme is for the electric chassis vehicle to confirm whether it has run to the test position and working position through its internal linkage mechanism and auxiliary switch. The other scheme is for a device that is not directly related to the auxiliary switch of its main body to reconfirm its position status, so as to ensure that the position of the electric chassis vehicle (circuit breaker) is accurate and to fully guarantee the safe execution of the program operation.

[0006] Currently, there are two main methods for the installation and implementation of limit switch accessories that are not directly related to the switch body. The first method uses a switch installed on the lower guide rail of the partition in the switchgear trolley compartment. This installation position is often used when other components are installed on the partition of a high-current switchgear, such as a fan installed under the partition of a high-current switchgear or a fiber optic distribution frame installed in the lower cable compartment of a smart station switchgear. This results in limited installation and assembly space, making maintenance and construction extremely inconvenient. This method is particularly difficult to implement and not suitable for large-scale promotion, especially when encountering switchgear in similar situations during the renovation of old stations. The other method, side mounting, often uses a common contact microswitch with a metal impact block. When the chassis moves into position, the impact block directly collides and rubs against the top of the microswitch, generating downward pressure. Because the use of metal impact blocks and microswitches results in direct lateral impacts on the perpendicular planes of the two components, the damage to the components is very significant. At the same time, the deviation and swaying of the trolley can easily cause deviations in the straight-line collision of the impact blocks. Over long-term operation, jamming and misalignment are very likely to occur, resulting in a high failure rate. This not only reduces the lifespan of the components but also fails to provide accurate feedback on the actual position of the trolley. Summary of the Invention

[0007] The technical problem to be solved by the present invention is: in view of the problems existing in the prior art, the present invention provides a trolley-type switch cabinet chassis travel position double confirmation device with simple and compact structure, easy installation and use, low cost and long service life.

[0008] To solve the above-mentioned technical problems, the technical solution proposed by this invention is as follows:

[0009] A dual-confirmation device for the travel position of a trolley-type switchgear chassis includes a working position limit switch, a test position limit switch, and a rolling bearing. The rolling bearing is located on the front baffle of the trolley. The working position limit switch and the test position limit switch are mounted on the cabinet of the switchgear and located on one side of the movement trajectory of the rolling bearing. Both the working position limit switch and the test position limit switch are push-button microswitches, and one end of their transmission components is provided with a roller. When the trolley is in the test position, the rolling bearing abuts against the roller of the test position limit switch. When the trolley is in the working position, the rolling bearing abuts against the roller of the working position limit switch.

[0010] As a further improvement to the above technical solution:

[0011] Both the working position limit switch and the test position limit switch are mounted on one side of the cabinet via a first mounting plate, and the rolling bearing is mounted on the front baffle of the trolley via a second mounting plate.

[0012] The micro switch includes an upper housing and a lower housing, which enclose a cavity. A contact working component is disposed in the cavity. The upper housing has a mounting hole on which a diaphragm assembly is mounted. A transmission component is mounted on the outside of the diaphragm assembly. A roller is located at one end of the transmission component, and the other end of the transmission component abuts against the diaphragm assembly.

[0013] The transmission assembly includes a limiting sleeve, an elastic pin, and a guide rod. One end of the guide rod is connected to one end of the elastic pin, and the other end of the elastic pin extends into the diaphragm assembly in the mounting hole. The roller, guide rod, and elastic pin are all located inside the limiting sleeve.

[0014] The elastic ejector pin includes an ejector pin and a spring. The ejector pin has a stop portion on one side of the mounting hole. The spring is sleeved on the ejector pin and one end abuts against the stop portion.

[0015] The mounting hole of the upper housing is provided with an annular retaining edge, the diaphragm assembly is snapped onto the annular retaining edge of the mounting hole, and the periphery of the diaphragm assembly is fastened to the annular retaining edge by a fastening assembly.

[0016] The fastening component is a clamp.

[0017] A limiting component is provided between the tympanic membrane assembly and the pressing spring in the contact working assembly to limit the movement between the tympanic membrane assembly and the pressing spring.

[0018] The limiting component includes a buckle, and limiting grooves are provided on both sides of one end of the pressing spring. The buckle has locking edges on both sides that extend into the limiting grooves. A limiting post is provided above the buckle, and the limiting post is located in the limiting hole of the tympanic membrane component.

[0019] The limiting groove is a trapezoidal groove.

[0020] Compared with the prior art, the advantages of the present invention are as follows:

[0021] (1) This invention utilizes the tangential motion of the rolling surface of the rolling bearing with the rollers of each limit switch. In the test position and the working position, the cylindrical side of the rolling bearing presses against the transmission element roller of the limit switch in the test position. During the pressing process, rolling friction is used. When the two parts are engaged and disengaged, the contact surface is fully guaranteed and the pressure is maximized at the fixed point in the test position or the working position. This greatly reduces the lateral movement caused by the circuit breaker during the rocking process and the pressure wear on the limit switches in each position. The two parts are subjected to balanced force, which greatly improves the accuracy, reliability and service life of the equipment. The overall structure is simple and compact, easy to install and use, and has low manufacturing cost. It has good economic benefits and is easy to promote and apply.

[0022] (2) This invention, by combining the aforementioned confirmation device with the internal linkage mechanism and auxiliary switch of the trolley body, solves the problem of confirming the circuit breaker position required for "one-click sequential control" of the switchgear, improves the reliability and service life of the equipment, and ultimately realizes the one-click sequential control function of the intelligent switchgear. This invention has good integration, ingenious design, small size, good versatility, does not occupy valuable space in the trolley room, does not affect the original product structure and performance, is applicable to various cabinet types, not only facilitates the production of new equipment, but also facilitates the transformation of old equipment already in operation, and has a wide range of applications.

[0023] (3) The present invention uses a limiting component to limit the tympanic membrane assembly and the pressing spring, so that there is no relative movement between the contact surfaces of the tympanic membrane assembly and the pressing spring, and the torque is uniformly the axial working torque of the switch, thereby ensuring that the switch stroke action effectively triggers the signal and improving the reliability of the operation.

[0024] (4) By adding a clamp at the interface of the tympanic membrane assembly, the center of the tympanic membrane assembly will not shrink when it is impacted by the pin of the transmission assembly, thus avoiding the situation where the protection level is reduced and the switch cannot work effectively due to the shrinkage of the tympanic membrane assembly; at the same time, the clamp can also make the mounting holes of the tympanic membrane assembly and the upper housing fit more tightly, thereby improving the protection level. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the device of the present invention in an embodiment.

[0026] Figure 2 for Figure 1 A magnified view of a portion of the image.

[0027] Figure 3 This is a side view of the micro switch of the present invention in an embodiment.

[0028] Figure 4 for Figure 3 AA view.

[0029] Figure 5 This is a structural diagram of the limiting component of the present invention in an embodiment.

[0030] Figure 6 This is a schematic diagram showing the cooperation relationship between the limiting component and the pressing spring of the present invention.

[0031] Figure 7 This is a structural diagram of the limiting groove on the pressing spring of the present invention in an embodiment.

[0032] Figure 8 This is a schematic diagram showing the fit between the diaphragm assembly and the mounting hole of the present invention.

[0033] Figure 9 This is a structural diagram of the clamp of the present invention in an embodiment.

[0034] Legend: 1. Cabinet; 2. Circuit breaker; 3. Working position limit switch; 4. Test position limit switch; 5. Rolling bearing; 6. First mounting plate; 7. Second mounting plate; 8. Micro switch; 81. Upper housing; 811. Mounting hole; 812. Annular flange; 82. Lower housing; 83. Contact working assembly; 831. Pressing spring; 8311. Limiting groove; 832. Spring assembly; 84. Diaphragm assembly; 841. Fastening assembly; 842. Limiting hole; 85. Transmission assembly; 851. Limiting sleeve; 852. Elastic ejector pin; 8521. Ejector pin; 8522. Spring; 853. Guide rod; 854. Roller; 86. Limiting assembly; 861. Buckle; 862. Clamping edge; 863. Limiting post. Detailed Implementation

[0035] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0036] like Figure 1 and Figure 2As shown, the dual-confirmation device for the travel position of the trolley-type switchgear chassis in this embodiment includes a working position limit switch 3, a test position limit switch 4, and a rolling bearing 5. The rolling bearing 5 is located on the front baffle of the trolley. The working position limit switch 3 and the test position limit switch 4 are installed on the cabinet 1 of the switchgear and are located on one side of the movement trajectory of the rolling bearing 5. The working position limit switch 3 and the test position limit switch 4 are both push-button microswitches 8, and one end of their transmission component 85 is provided with a roller 854. When the trolley is in the test position, the rolling bearing 5 abuts against the roller 854 of the test position limit switch 4. When the trolley is in the working position, the rolling bearing 5 abuts against the roller 854 of the working position limit switch 3. That is, each position limit switch is installed in a corresponding fixed position through simulated cooperation. This invention utilizes the tangential movement of the rolling surface of the rolling bearing 5 with the rollers 854 of each limit switch, and each roller 854 can be pressed. In the test position and the working position, the cylindrical side of the rolling bearing 3 presses against the roller 854 of the limit switch 4 in the test position. During the pressing process, rolling friction is used, and the contact surface is fully guaranteed when the two parts are engaged and disengaged, and the pressure is maximized at the fixed point in the test position or the working position. This greatly reduces the lateral movement of the circuit breaker 2 during the rocking in and out process, which causes pressure wear on the limit switches in each position. The two parts are subjected to balanced force, which greatly improves the accuracy, reliability and service life of the equipment. The overall structure is simple and compact, easy to install and use, low in manufacturing cost, and has good economic benefits, making it easy to promote and apply.

[0037] In one specific embodiment, such as Figure 2 As shown, the working position limit switch 3 and the test position limit switch 4 are both mounted on one side of the cabinet 1 via the first mounting plate 6, and the rolling bearing 5 is mounted on the front baffle of the trolley via the second mounting plate 7.

[0038] In one specific embodiment, such as Figure 4 As shown, the micro switch 8 includes an upper housing 81 and a lower housing 82, which enclose a cavity. A contact working component 83 is disposed in the cavity. The upper housing 81 is provided with a mounting hole 811, on which a diaphragm assembly 84 is mounted. A transmission component 85 is mounted on the outside of the diaphragm assembly 84. One end of the transmission component 85 is provided with a roller 854, and the other end abuts against the diaphragm assembly 84.

[0039] In one specific embodiment, such as Figure 4As shown, the transmission assembly 85 includes a limiting sleeve 851, an elastic pin 852, and a guide rod 853. One end of the guide rod 853 is connected to one end of the elastic pin 852, and the other end of the guide rod 853 is provided with a roller 854. The other end of the elastic pin 852 extends into the diaphragm assembly 84 in the mounting hole 811. The roller 854, guide rod 853, and elastic pin 852 are all located inside the limiting sleeve 851. The elastic pin 852 includes a pin 8521 and a spring 8522. The pin 8521 has a stop portion on one side of the mounting hole 811, and the spring 8522 is sleeved on the pin 8521 with one end abutting against the stop portion. In addition, the contact working assembly 83 includes three terminals: COM (common terminal), NO (normally open terminal), and NC (normally closed terminal).

[0040] In one specific embodiment, such as Figure 4 , Figure 8 and Figure 9 As shown, an annular retaining edge 812 is provided around the mounting hole 811 of the upper housing 81, and the diaphragm assembly 84 is snapped onto the annular retaining edge 812 of the mounting hole 811. The periphery of the diaphragm assembly 84 is fastened to the annular retaining edge 812 by a fastening component 841 (such as a clamp). By adding a clamp at the interface of the diaphragm assembly 84, the center of the diaphragm assembly 84 will not retract when impacted by the pin 8521 of the transmission component 85, thus avoiding the situation where the diaphragm assembly 84 retracts, resulting in a reduction in the protection level and the ineffective operation of the switch; at the same time, the clamp can also make the diaphragm assembly 84 and the mounting hole 811 of the upper housing 81 fit more tightly, thereby improving the protection level.

[0041] In one specific embodiment, such as Figure 4-7 As shown, a limiting component 86 is provided between the tympanic membrane assembly 84 and the pressing spring 831 in the contact working assembly 83 to limit the movement between the tympanic membrane assembly 84 and the pressing spring 831. Specifically, the limiting component 86 includes a latch 861, limiting grooves 8311 are formed on both sides of one end of the pressing spring 831, and retaining edges 862 extending into the limiting grooves 8311 are provided on both sides of the latch 861, i.e., the retaining edges 862 are engaged in the grooves. A limiting post 863 is provided above the latch 861, and the limiting post 863 is located in the limiting hole 842 of the tympanic membrane assembly 84. The limiting component 86 limits the movement between the tympanic membrane assembly 84 and the pressing spring 831, preventing relative movement between the contact surfaces of the tympanic membrane assembly 84 and the pressing spring 831. The torque is uniformly the axial working torque of the switch, thereby ensuring the effective trigger signal of the switch travel action and improving the reliability of the operation.

[0042] In one specific embodiment, the buckle 861 is a plastic buckle, and the limiting groove 8311 adopts a trapezoidal groove design, such as... Figure 7As shown. When the reed assembly 832 is mechanically jammed, the diaphragm assembly 84 and the limiting assembly 86 can move along the inclined slopes on both sides of the trapezoidal groove to relieve the force when the force reaches the critical point, so that the interior is not violently damaged, thus providing a certain degree of protection.

[0043] Working principle: When circuit breaker 2 moves to the test position, the cylindrical side of the rolling bearing 3 will make tangential contact with the transmission element roller 854 of the test position limit switch 4. Under the influence of the tangential pressure of the rolling bearing 3, the limit switch roller 854 is pushed backward, the internal contacts of the limit switch are activated, and the test position limit switch 4 is connected to the signal circuit, which will give a switch signal to the terminal to confirm that circuit breaker 2 is in the test position. When circuit breaker 2 moves to the working position, the rolling bearing 3 directly pushes the working position limit switch 3 to operate, and similarly gives a switch signal to the terminal through the limit switch to confirm that circuit breaker 2 is in the working position (after circuit breaker 2 leaves the test position, the limit switch 4 is reset under the force of the compression spring 8522).

[0044] This invention combines the aforementioned confirmation device with the internal linkage mechanism and auxiliary switch of the trolley body to solve the problem of confirming the position of circuit breaker 2 required for "one-click sequential control" of the switch cabinet, thereby improving the reliability and service life of the equipment and ultimately realizing the one-click sequential control function of the intelligent switch cabinet.

[0045] This invention features good integration, ingenious design, small size, and good versatility. It does not occupy valuable space in the trolley room, does not affect the original product structure and performance, and is applicable to various cabinet types. It not only facilitates the production of new equipment, but also facilitates the transformation of old equipment already in operation, and has a wide range of applications.

[0046] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of the present invention should be considered within the scope of protection of the present invention.

Claims

1. A trolley switchgear chassis car stroke position double confirmation device, characterized in that, It includes working position travel switch (3), test position travel switch (4) and rolling bearing (5), the rolling bearing (5) is located on the front apron of the trolley, the working position travel switch (3) and test position travel switch (4) are installed on the cabinet body (1) of switch cabinet, and are located on the side of the movement track of the rolling bearing (5), the working position travel switch (3), test position travel switch (4) are all press type microswitch (8), and one end of its transmission assembly (85) is provided with a roller (854), the rolling section of the rolling bearing (5) is tangent to the roller (854) of each travel switch, when the trolley is located at the test position, the rolling bearing (5) is in abutment with the roller (854) of test position travel switch (4), when the trolley is located at the working position, the rolling bearing (5) is in abutment with the roller (854) of working position travel switch (3), The microswitch (8) includes upper shell (81) and lower shell (82), the upper shell (81) and lower shell (82) are enclosed to form a cavity, the cavity is provided with contact working assembly (83), the upper shell (81) is provided with mounting hole (811), the mounting hole (811) is provided with tympanic membrane assembly (84), the outer side of the tympanic membrane assembly (84) is provided with transmission assembly (85), the roller (854) is located at one end of the transmission assembly (85), the other end of the transmission assembly (85) is in abutment with the tympanic membrane assembly (84), The transmission assembly (85) includes limiting sleeve (851), elastic ejector pin (852) and guide rod (853), one end of the guide rod (853) is connected with one end of the elastic ejector pin (852), the other end of the elastic ejector pin (852) extends into the tympanic membrane assembly (84) of mounting hole (811), the roller (854), guide rod (853) and elastic ejector pin (852) are all located in the limiting sleeve (851), The limiting assembly (86) is arranged between the tympanic membrane assembly (84) and the pressing spring piece (831) in the contact working assembly (83), for realizing the limiting between the tympanic membrane assembly (84) and the pressing spring piece (831); The limiting assembly (86) includes buckle (861), the both sides of one end of the pressing spring piece (831) are provided with limiting slot (8311), the both sides of the buckle (861) are provided with clamping edge (862) extending into the limiting slot (8311), the upper side of the buckle (861) is provided with limiting column (863), the limiting column (863) is located in the limiting hole (842) of the tympanic membrane assembly (84).

2. The trolley switchgear chassis trolley stroke position double confirmation device according to claim 1, characterized in that, The working position travel switch (3) and test position travel switch (4) are both installed on the side of the cabinet body (1) through the first mounting plate (6), the rolling bearing (5) is installed on the front apron of the trolley through the second mounting plate (7).

3. The trolley switchgear chassis trolley stroke position double confirmation device according to claim 1, characterized in that, The elastic top pin (852) comprises a top pin (8521) and a spring (8522), the top pin (8521) is provided with a stop portion on one side of the mounting hole (811), and the spring (8522) is sleeved on the top pin (8521) and abuts against the stop portion at one end.

4. The trolley switchgear chassis trolley stroke position double confirmation device according to claim 1, characterized in that, The mounting hole (811) of the upper shell (81) is provided with an annular stop edge (812) on the periphery, the tympanic membrane assembly (84) is clamped on the annular stop edge (812) of the mounting hole (811), and the periphery of the tympanic membrane assembly (84) is fastened on the annular stop edge (812) through a fastening assembly (841).

5. The trolley switchgear chassis trolley stroke position double confirmation device according to claim 4, characterized in that, The fastening assembly (841) is a clamp.

6. The trolley switchgear chassis trolley stroke position double confirmation device according to claim 1, characterized in that, The limiting groove (8311) is a trapezoidal groove.

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