Low-voltage switch maintenance test trolley

Abstract

The invention discloses a low-voltage switch overhaul test trolley, which is suitable for overhaul and maintenance of low-voltage electrical panel cabinets, buses and switches of coal machine and gas turbine units, and is particularly suitable for convenient test of drawer type and frame type low-voltage switches. The test trolley comprises a base, a stand column support of a twin-tower structure, a multifunctional electric power meter, a transparent insulation protection plate, an air switch, a button with a lamp and the like. The test dolly is equipped with multiple paths of power supply outputs, supports 24V, 110V, 220V and 380V power supply interfaces, and adapts to maintenance requirements of various low-voltage switches. The trolley is reasonable in design, multiple switches can be tested at the same time through the double-layer back-to-back support structure, and the transparent protection plate provides safety isolation and facilitates observation of the internal electrical state. The multifunctional electric power meter displays electrical parameters in real time, and the maintenance precision is ensured. The test trolley can significantly improve the maintenance efficiency, reduce the human input and ensure the operation safety, is effectively suitable for complex maintenance scenes such as overhaul, and has high popularization and application values.

Description

Technical Field

[0001] The invention relates to the technical field of electrical equipment maintenance, in particular to a low-voltage switch maintenance test trolley. Background Art

[0002] During the maintenance and overhaul of electrical systems, the overhaul of low-voltage switches is an important part of ensuring the safe and stable operation of the system. Traditional low-voltage switch overhaul methods usually rely on manual operation, mainly through disassembly, transportation and temporary power connection. Especially in the overhaul of coal-fired and gas-fired units, there are many low-voltage switches, which are widely distributed and require a large overhaul workload. The overhaul personnel are required to remove the switches from the cabinets one by one, transport them to specific test positions, and then apply contact pressure by external force or connect temporary power supply to test their electrical circuits and mechanical states. This traditional method is not only inefficient, but also easily affected by unstable factors of human operation, and cannot accurately reflect the performance of the low-voltage switch under actual operating conditions.

[0003] At present, most low-voltage switches are divided into two types: drawer type and frame type. The installation and disassembly of drawer-type switches are relatively frequent, and they are mostly used for low-power circuit control. Frame switches are usually used for high-power circuits and require higher maintenance accuracy. For drawer-type switches, the traditional maintenance method can usually only achieve contact closure by manually applying pressure. This method has poor reliability and often cannot accurately simulate the contact state of the switch in normal operation. The maintenance of frame switches is more complicated. During maintenance, only its mechanical opening and closing actions can be tested, and it is difficult to accurately detect its electrical circuit status. In addition, the maintenance site usually requires temporary power supplies of multiple voltage specifications, such as 24V, 110V, 220V and 380V. Existing equipment often cannot meet the switching requirements of multiple voltage specifications, which increases the complexity of on-site layout.

[0004] In overhaul operations, in order to ensure the quality of maintenance, it is often required to conduct a comprehensive inspection of the low-voltage switch and its control circuit, including the verification of the set value, the access of the remote start and stop command, and the verification of the feedback status. However, due to the limitations of tools and equipment, traditional maintenance methods can usually only perform partial function tests by temporarily connecting the power when the bus is out of power. And under high-frequency maintenance requirements, disassembling and moving low-voltage switches is time-consuming and laborious, which not only increases the difficulty of operation, but also poses a greater safety risk. Maintenance personnel are prone to mechanical injuries or electric shock risks. In addition, existing equipment lacks reliable safety protection measures and is easily affected by environmental dust, which reduces the efficiency and accuracy of maintenance.

[0005] Therefore, in view of the defects of the prior art, there is an urgent need for a maintenance test device that can be applied to drawer-type and frame-type low-voltage switches, so as to reduce the need for disassembly and transportation during the maintenance process, and provide a convenient, safe and efficient test environment that can simulate the actual operating state of the switch, thereby improving the accuracy and reliability of low-voltage switch maintenance. This device should have an electrical interface configuration that is convenient for on-site use, meet the requirements of multiple voltage specifications, be able to fully detect the electrical and mechanical states of the low-voltage switch, and have a safety protection function to protect the safety of maintenance personnel during operation. Summary of the invention

[0006] The present invention relates to a low-voltage switch maintenance test trolley, which is specially designed for electrical maintenance personnel during the maintenance of low-voltage switch equipment, and is particularly suitable for the maintenance of low-voltage electrical panels, busbars and switches of coal-fired and gas-fired units. The existing low-voltage switch maintenance method has problems such as large workload, long maintenance time, inconvenient operation, and insufficient safety. Especially during the overhaul process, due to busbar power outages and space limitations, maintenance personnel cannot directly perform comprehensive tests at the switch installation location, and often need to move the switch to other locations for power-on testing, which is time-consuming and labor-intensive, and increases safety risks.

[0007] The trolley of the present invention has a compact structure and comprehensive functions. It can provide a convenient test environment for the low-voltage switch outside the switch cabin, realize the testing of the relays, contactors and other components inside the switch, avoid the transportation problem caused by the limited maintenance space, and effectively improve the maintenance efficiency. The design of the test trolley combines the actual needs of the maintenance site. By integrating a variety of electrical testing equipment, flexible power supply configuration and a convenient operating platform, maintenance personnel can complete the functional test and status detection of the low-voltage switch in the shortest time, meeting the requirements of lean maintenance.

[0008] The main features and innovations of the invention

[0009] Strong comprehensiveness: The test vehicle is equipped with AC and DC 24V, 110V, 220V and 380V power supplies, which are suitable for various test requirements of low-voltage switches and can test the power circuit and control circuit of the switch. The multifunctional power meter provides functions such as primary circuit voltage and current measurement, contactor auxiliary contact direct resistance measurement, etc., supports multiple inspection requirements such as remote start and stop, status feedback, interlocking and emergency stop circuits, and fully meets the process standards for low-voltage switch maintenance.

[0010] Special design: The test trolley adopts a twin tower structure, and a special test frame is designed to adapt to drawer switches of different heights. At the same time, corresponding test environments are designed according to the structural differences between drawer and frame switches. The drawer switch test position adopts a small slope design with high outside and low inside, and a baffle is provided on the inside to prevent the switch from sliding, which is convenient for placement and retrieval; the frame switch test machine is divided into two test chambers, MT type and HA1 type, which can meet the specific test requirements of different switch types.

[0011] Convenient and efficient: The test trolley of the present invention uses modular test frame design and flexible power supply configuration to control the maintenance test time of each switch within 5 minutes, greatly shortening the maintenance time. The operator can quickly complete the power-on, opening and closing, and status detection of the low-voltage switch on the trolley, and realize seamless switching between remote and local control, which is suitable for the current actual situation of large maintenance workload, few personnel, and heavy tasks.

[0012] Safety protection: The test trolley is equipped with a transparent insulating protective plate, which has a dust-proof function and ensures that the test personnel will not touch the exposed electrical parts during the inspection process, reducing the risk of electric shock. At the same time, the transparent design of the trolley makes it easy for the operator to observe the operating status of the internal electrical equipment, ensuring operational safety while improving work convenience.

[0013] Strong innovation, no similar products on the market: There is no similar low-voltage switch maintenance test trolley on the market. The trolley was independently designed by the on-site maintenance innovation team, combined with years of maintenance experience, and fully considered the actual maintenance needs. By "repairing the old and making good use of the waste", the old switch frame was used to transform the test cabin, reducing costs. The successful application of the test trolley not only significantly improves the maintenance efficiency, but also has the potential to be promoted to other enterprises, which can generate good economic and social benefits.

[0014] Beneficial Effects

[0015] The low-voltage switch maintenance test trolley of the present invention is designed in terms of function and structure to meet the actual maintenance needs of low-voltage switches, and has the characteristics of high efficiency, safety and convenience. Through the application of the trolley, the workload of maintenance personnel can be significantly reduced, the labor intensity can be reduced, and the maintenance efficiency and safety can be improved. In actual application, the trolley has been put into use in the busbar maintenance of the PC section of the old heating plant and the MCC section of the first station of the heating network. The maintenance time has been shortened from the original 7 days to 3 days, greatly improving the maintenance speed and quality.

[0016] The trolley is suitable for maintenance work involving low-voltage switches in industries such as electricity, chemical industry, and metallurgy, and has outstanding application advantages, especially in the case of busbar power outage and limited space. In the future, it can be promoted and used in other enterprises to provide strong technical support for the daily maintenance and overhaul of low-voltage switches, and is expected to bring significant economic and social benefits to enterprises. Through patent application protection, this invention will further promote the development of low-voltage switch maintenance technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 This is a schematic diagram of the external three-dimensional structure of a trolley according to an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the internal structure of a trolley according to an embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the internal structure of a trolley according to an embodiment of the present invention;

[0021] Figure 4 Schematic diagram of a drawer switch test simulation according to an embodiment of the present invention.

[0022] The markings in the figure are:

[0023] 1. Column; 2. Base; 3. Drawer-type switch test position; 4. Protective plate; 5. Air switch; 6. Aviation plug; 7. Multi-function power meter; 8. Illuminated button; 9. Universal wheel with brake; 10. Switch test machine; 11. Test machine base. DETAILED DESCRIPTION

[0024] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. At the same time, it is explained here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art may also adopt other alternatives to implement some known technologies; and the accompanying drawings are only for more specific description of the embodiments, and are not intended to specifically limit the present invention.

[0025] It should be noted that the references to "one embodiment", "an embodiment", "an exemplary embodiment", "some embodiments" and the like in the specification indicate that the embodiments described may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, when a specific feature, structure or characteristic is described in conjunction with an embodiment, it should be within the knowledge of a person skilled in the art to implement such feature, structure or characteristic in conjunction with other embodiments (whether or not explicitly described).

[0026] In general, a term can be understood, at least in part, from its use in context. For example, depending, at least in part, on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending, at least in part, on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0027] The present invention relates to a low-voltage switch inspection and testing trolley, which is mainly used for the inspection and maintenance of low-voltage electrical panels, busbars and switches of coal-fired and gas-fired units, and is particularly suitable for the testing and inspection of drawer-type and frame-type low-voltage switches. The design of the trolley focuses on portability, safety and ease of operation to ensure efficient on-site inspection and maintenance operations.

[0028] See also Figures 1 to 3

[0029] The present invention relates to a low-voltage switch maintenance test trolley, which is specially designed for the maintenance of low-voltage switches of coal-fired and gas-fired units, and can significantly improve the maintenance efficiency, reduce labor intensity, and ensure the safety of operation. The test trolley is compact in design and comprehensive in functions, and is convenient for flexible use in complex maintenance environments. Its main structure includes a base 2, a column 1, a drawer-type switch test position 3, a protective plate 4, an air switch 5, an aviation plug 6, a multifunctional power meter 7, a button with light 8, a universal wheel 9, a switch test machine 10, and a test machine base 11. The following is a detailed implementation method of each part.

[0030] 1. The overall structure of the test vehicle

[0031] The test trolley is supported by the base 2, and a twin tower test frame is constructed through the columns 1 to provide structural support and stability for the entire trolley. The width and length of the base 2 are designed to be 600 mm and 1000 mm respectively, which can be flexibly moved between the distribution room and the cabinet to adapt to various on-site maintenance environments. Four universal wheels 9 are installed at the bottom of the base, two of which are equipped with brakes to facilitate the movement and positioning of the trolley and ensure that it will not tip over or move during maintenance.

[0032] The test rack adopts a twin tower structure arranged back to back, with a test machine 10 on the left and right. The MT switch test machine is placed at the bottom of the left test rack, and the HA1 switch test machine is placed at the bottom of the right test rack. This back-to-back arrangement can not only place a variety of switches, but also support two people to operate at the same time, meeting the needs of multi-task maintenance. The height of the entire test rack is designed to be 1500 mm, providing sufficient space and convenient operation.

[0033] 2. Drawer-type switch test position

[0034] The drawer switch test position 3 is set on the upper part of the column 1, and adopts a multi-layer bracket form. Each layer of the bracket has a small slope with a high outside and a low inside, ensuring that the drawer switch is placed stably. A baffle is provided on the inside of the bracket to prevent the drawer switch from sliding due to the slope. This slope design not only ensures the fixation of the switch, but also facilitates the operator to place and remove the switch, and is suitable for the inspection and maintenance of drawer switches at different heights.

[0035] The drawer switch test position 3 installed on the test trolley can be connected to a 380V AC power supply and connected to the contacts on the power supply input side of the switch through a dedicated three-phase wire clamp to provide the power required for the normal operation of the switch. The start and stop operation of the drawer switch is achieved through a lighted button 8, and the indicator light displays the switch status in real time. The operator can use a multi-function power meter 7 to observe the switch output voltage and quickly determine the electrical status and functionality of the switch.

[0036] 3. Switch testing machine

[0037] Two types of switch testers 10 are designed on the test vehicle for the inspection and maintenance of different types of low-voltage switches. The tester on the left is an MT type switch tester, and the one on the right is an HA1 type switch tester. Both switch testers 10 are fixed on the tester base 11 to maintain structural stability and accuracy, and can provide a test environment for the switch under actual working conditions.

[0038] During the inspection and maintenance process, the MT and HA1 switches are placed in their respective test machines 10. During the test, the operator connects the control power supply to the control terminal of the corresponding switch, realizes the opening and closing operation of the switch through the lighted button 8, and detects the electrical state of the switch through the voltage displayed by the multi-function power meter 7. The test trolley is also equipped with AC 220V and DC 24V power modules to facilitate testing of various control circuits of the switch and ensure the accuracy of the inspection and maintenance.

[0039] 4. Protective plate design

[0040] The test trolley is equipped with a transparent protective plate 4, which covers the test area and is made of insulating material, with dustproof and protective functions. The protective plate 4 is connected by hinges, easy to operate, and equipped with a door lock and door handle, which can effectively isolate the test personnel and the exposed parts of the electrical equipment to prevent the risk of accidental electric shock. The transparent design enables the operator to observe the operating status of the electrical equipment inside the trolley in real time during operation, ensuring the safety of operation while improving the convenience of operation.

[0041] 5. Power supply and control device

[0042] The test vehicle is equipped with multiple power outputs, connected by aviation plug 6, which can adapt to 24V, 110V, 220V and 380V power supplies to meet the voltage requirements of different switch maintenance. Air switch 5 is used to control the power switch to ensure the stability and safety of power supply. The multi-voltage adaptation function of aviation plug 6 ensures the power supply requirements of low-voltage switches in various states.

[0043] The multifunctional power meter 7 is installed on the operation panel, which can display the input and output voltage of the primary circuit of the switch in real time, support current and DC resistance measurement, and ensure the accuracy of the data. The power meter 7 also integrates red and green indicator lights, which can intuitively display the feedback signal of the remote control circuit. Through this design, the operator can easily monitor the operating status of the switch, reduce detection errors, and improve maintenance efficiency.

[0044] 6. Illuminated buttons and control modes

[0045] The lighted button 8 is set on the operation panel to control the opening and closing operation of the switch. The lighted button 8 integrates red and green indicator lights, which can respectively display the closing and opening status of the switch. The test trolley is designed with the function of switching between local and remote control modes, which is convenient for the operator to select the control mode according to the maintenance requirements and realize remote operation and monitoring of the switch. In this way, the test trolley can comprehensively check the status of the switch and ensure that all control circuits are working properly.

[0046] 7. Protection and safety measures

[0047] In order to ensure the safety of operation, the electrical test wiring part of the test trolley is enclosed with an overall transparent insulating material to form an independent protection area, ensuring that the test personnel will not touch the exposed electrical parts during the inspection and maintenance process, effectively preventing the risk of electric shock. In addition, the protective plate 4 of the trolley is designed to block dust, ensuring that the interior of the trolley is clean during long-term use, and maintaining the stability and durability of the equipment.

[0048] 8. Instructions for use

[0049] During the actual maintenance process, the operator can use the test trolley in the following steps:

[0050] Frame switch: Select 110V or 220V aviation plug 6 to connect to the test power supply, and push the switch to the working position of the test chamber. After closing the test power switch, the operator presses the red closing button, observes the indicator light and the power meter 7 display, and verifies the switch's opening and closing functions and set value settings. After the maintenance is completed, put the switch in the maintenance position and turn off the test power supply.

[0051] Drawer switch: Connect 380V and 220V aviation plugs 6, place the drawer switch, and connect the power supply. After turning on the power supply, use the lighted button 8 to perform the opening and closing operations, use the power meter 7 to monitor the three-phase voltage, observe the indicator light status, and ensure the normal working feedback of the switch under the remote command. After the maintenance is completed, pull the switch handle to the maintenance position and turn off the test power supply.

[0052] Example

[0053] 1. Design and production of test trolley and test frame

[0054] 1. Test stand design

[0055] The test frame adopts a back-to-back twin tower structure with an overall height of 1500 mm. The left and right sides are designed as test positions for different switches. An MT switch tester is installed at the bottom of the left side of the test frame, and an HA1 switch tester is installed at the bottom of the right side. In order to place different types of drawer switches, the test frame is designed as a multi-layer bracket, each layer of which is high outside and low inside, and a small baffle is set on the inside to prevent the drawer switch from sliding. The slope design of the bracket not only ensures the fixity of the switch, but also facilitates the operator to place and remove the switch.

[0056] 2. Base and universal wheels

[0057] The test trolley base is 600 mm wide and 1000 mm long, with four universal wheels installed at the bottom, two of which are equipped with brakes. The universal wheel design ensures that the trolley can be pushed flexibly between the switch room and the cabinet, while the brake device can stabilize the trolley when needed to avoid displacement or tipping during the test.

[0058] 3. Material selection and installation

[0059] The test frame is mainly made of galvanized C-shaped steel material, and both the base and the bracket are made of this material to ensure the load-bearing and stability of the structure. The columns are supported by galvanized steel with good load-bearing properties, and the front and rear beams of each layer of brackets are angle steel to ensure the stability of the overall structure. During installation, universal wheels are installed at the four corners of the base, and the columns are fixed to the base through connecting plates to form a stable structure. The brackets on each layer are connected by bolts, and the design of the brackets being high outside and low inside has been considered during installation to ensure that the drawer switches are placed smoothly.

[0060] 2. Connection of test circuit

[0061] 1. MT and HA1 switch test circuit

[0062] On the left side of the test vehicle, an MT switch tester is installed. The old MT frame switch is transformed into a test cabin to provide control power for the switch opening and closing. The test circuit is equipped with opening and closing buttons and status indicators. The switch will display the current working status during opening and closing operations. The HA1 switch tester on the right is also transformed from an old switch frame. The test circuit has control power and indication functions. The operator can open and close the switch through buttons and monitor the characteristics of the electrical circuit.

[0063] 2. Drawer switch test circuit

[0064] The drawer switch test position is connected to a 380V AC power supply, and the safety of the test power supply is ensured by special three-phase wire clamps and air switches. The operator connects the three-phase power supply to the contact on the power supply inlet side of the drawer switch, and completes the closing and opening operations of the switch through the lighted buttons on the operation panel. At the same time, the multi-function power meter displays the three-phase output voltage in real time to help the operator judge the electrical status and operation of the switch.

[0065] 3. Design and installation of protective measures

[0066] The test trolley is equipped with a transparent insulating protective plate to protect the safety of the test personnel. The protective plate is made of a transparent insulating plate to ensure that the test personnel will not touch the exposed electrical parts during operation, and it is convenient to observe the status of the equipment under test. The protective plate is connected to the test frame through a hinge, and is equipped with a door lock and door handle, which is dust-proof and easy to open, improving the safety and convenience of use.

[0067] 4. Overall installation and debugging of the test vehicle

[0068] 1. Installation of power meters and control panels

[0069] The multifunctional power meter is installed on the operation panel, providing multiple measurement functions such as voltage, current, DC resistance, etc., and displays the input and output voltage of the primary circuit of the switch, which is convenient for real-time monitoring of various electrical parameters. The operation panel is equipped with a button with light to control the opening and closing operation of the switch, and the current switch status is displayed through red and green indicator lights to ensure that the maintenance process is intuitive and easy to understand.

[0070] 2. Test circuit and power supply connection

[0071] The test circuit connects the switch testers, air switches and aviation plugs to meet the power supply requirements of different voltage levels. The aviation plug is compatible with 24V, 110V, 220V and 380V power outputs to ensure the power supply requirements of the low-voltage switch under various test conditions. A temporary power output is also designed inside the trolley to provide convenient power support for on-site maintenance personnel.

[0072] 3. Safety protection and testing

[0073] After installation, the operator conducts an integrated inspection of each part of the test trolley to ensure that all wiring, functional modules and protective measures meet the design requirements. The protective cover and isolation board on the trolley effectively isolate the electrical equipment from the test personnel, and operating instructions are posted on the outside to improve the safety of the equipment.

[0074] 5. Specific instructions for use

[0075] 1. Maintenance process of frame switch

[0076] Select the 110V or 220V power supply of the test vehicle, connect it to the aviation plug, and after turning on the power, push the frame switch to the test position.

[0077] Press the red closing button with light, the indicator light should light up in the closing state, and the multi-function power meter will display the output voltage, so the operator can judge the working status of the switch.

[0078] Check the setting value of the trip unit panel to ensure that it meets the standard requirements.

[0079] After the inspection, the operator presses the green opening button to confirm that the switch is normally opened, disconnects the power supply, removes the switch, and prepares for the next switch test.

[0080] 2. Maintenance process of drawer switch

[0081] Select 380V and 220V power supplies and connect them to the aviation plug of the test vehicle.

[0082] Place the drawer switch in the test position and connect the power cord.

[0083] Press the red closing button, monitor the three-phase voltage through the multi-function power meter, observe the status of the indicator light, and ensure that the switch responds normally under remote commands.

[0084] Press the green opening button, observe whether the contactor resets normally, verify the display of the opening status indicator light, and ensure that the remote feedback is accurate.

[0085] After the inspection, remove the drawer switch and prepare for the next switch test.

[0086] VI. Implementation Effect

[0087] Through the specific operation of the above embodiments, the low-voltage switch maintenance test vehicle has shown significant effects in practical applications. Traditional maintenance usually requires six workers for seven days, but after using this test vehicle, it only takes four workers three days to complete, significantly reducing manpower and work-hour costs. In addition, the operator can quickly and accurately detect the electrical status of the switch during the maintenance process, greatly improving the maintenance quality and safety.

[0088] The low-voltage switch maintenance test trolley provided by the present invention is not only suitable for the maintenance of low-voltage switches of coal-fired and gas-fired turbine units, but can also be extended to other low-voltage switch maintenance scenarios, providing an efficient and convenient maintenance platform for the daily maintenance of low-voltage electrical equipment.

[0089] The present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to make the public have a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details. In addition, in order to avoid unnecessary confusion about the essence of the present invention, well-known methods, processes, procedures, components and circuits are not described in detail.

[0090] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A low-voltage switch maintenance test trolley, comprising a base (2), a column (1), a drawer-type switch test position (3), a protective plate (4), an air switch (5), an aviation plug (6), a multifunctional power meter (7), a button with light (8), a universal wheel with brake (9), a switch tester (10) and a tester base (11), characterized in that: The base (2) is located at the bottom of the test trolley and is connected to a universal wheel (9) with a brake, so as to facilitate the flexible movement and fixation of the trolley on site; a column (1) is provided on the base to support the overall structure of the test frame; The upright column (1) is fixedly connected to the base (2) to provide structural support for the test vehicle and maintain the height and stability of the test frame; The drawer switch test position (3) is arranged above the column and is designed as a multi-layer bracket. The bracket has a small slope with a high outside and a low inside. A baffle is provided on the inside to prevent the drawer switch from sliding. It is suitable for the placement and maintenance of drawer switches of different models and is convenient for various electrical tests. The protective plate (4) is made of transparent insulating material, covers the test area of ​​the test vehicle, has dustproof and protective functions, and is easy to open through the hinge and hook design, ensuring safety during operation and facilitating observation of the operating conditions of the internal electrical equipment; The air switch (5) and the aviation plug (6) are used to provide and control the test power supply, and can adapt to various voltage requirements such as AC and DC 24V, 110V, 220V and 380V, meet the power supply requirements of the low-voltage switch under different test conditions, and adapt to various maintenance environments; The multifunctional electric power meter (7) is installed on the operation panel and has voltage and current measurement functions, and can display the input and output voltages of the primary circuit of the switch, and display various status signals through indicator lights, so as to ensure data visualization and accuracy during the maintenance process; The lighted button (8) controls the opening and closing operations of the switch, and displays the current operation status through red and green indicator lights, thereby realizing remote control and feedback of the switch, and facilitating monitoring by on-site maintenance personnel; The switch tester (10) comprises an MT type switch tester and an HA1 type switch tester, which are respectively installed at the left and right bottoms of the test frame and are fixedly connected to the tester base (11), so that the tester has structural stability and position accuracy, can adapt to different types of frame-type low-voltage switches, and realize comprehensive testing of the switch electrical circuit; The testing machine base (11) is used to support and fix the switch testing machine (10), ensuring that the testing machine does not move or tilt during the inspection and maintenance process, thereby improving the safety and reliability of the test.

2. The low-voltage switch maintenance and testing vehicle according to claim 1 is characterized in that: The test trolley is equipped with a twin-tower test frame with a back-to-back arrangement design. An MT switch tester is installed on the left side and an HA1 switch tester is installed on the right side. This enables the trolley to accommodate and test multiple low-voltage switches at the same time, meeting multi-task maintenance needs and effectively improving maintenance efficiency.

3. The low-voltage switch maintenance and testing vehicle according to claim 1 is characterized in that: The multifunctional electric power meter (7) has a three-phase voltage display function, can synchronously display the three-phase output voltage through program setting, and provides a primary circuit voltage and a direct resistance measurement function of the contactor auxiliary contact, so as to monitor the switch state in real time and ensure the accuracy and safety of electrical data.

4. The low-voltage switch maintenance and testing vehicle according to claim 1 is characterized in that: The drawer-type switch test position (3) adopts a stacked structure with a small slope, each layer of bracket is high on the outside and low on the inside, and a baffle is provided on the inside to ensure that the drawer-type switch is placed stably and is easy to take in and out, and is suitable for the inspection and maintenance of drawer-type switches of various heights.

5. The low-voltage switch maintenance and testing vehicle according to claim 1 is characterized in that: The transparent protective plate (4) not only provides a protective function, but also enables test personnel to observe the operating conditions of the internal equipment in real time by using a transparent material design, and increases the convenience and safety of the protective plate by means of a hinge and door lock structure.

6. The low-voltage switch maintenance and testing vehicle according to claim 1 is characterized in that: The aviation plug (6) is adapted to power supplies of multiple different voltage levels, including AC and DC 24V, 110V, 220V and 380V, ensuring the power supply requirements of the low-voltage switch in various states and meeting various power supply requirements in the maintenance standards.

7. The low-voltage switch maintenance and testing vehicle according to claim 1 is characterized in that: The lighted button (8) has the function of switching between local and remote control modes, and displays the opening and closing states of the switch through indicator lights of different colors, so that maintenance personnel can easily judge the actual state of the switch, facilitating remote maintenance and control operations.

8. The low-voltage switch maintenance and testing vehicle according to claim 1 is characterized in that: The universal wheel (9) with brake is installed at the lower part of the trolley base, which not only ensures the flexibility of the trolley when it is pushed, but also can fix the position of the trolley through the brake device, thereby ensuring the stability and safety during the maintenance process.

9. The low-voltage switch maintenance and testing vehicle according to claim 1 is characterized in that: The overall structure of the trolley is compact, with a width of 600mm and a length of 1000mm. The design size allows for flexible movement in the distribution room, adapts to the space between panels, meets safety distance requirements, and is suitable for on-site maintenance needs.

10. The low-voltage switch maintenance and testing vehicle according to claim 1 is characterized in that: The test trolley can provide a test environment close to the actual working state for the low-voltage switch, especially closing the contacts of the drawer switch by electromagnetic attraction, replacing the traditional external force compression method, to ensure the authenticity and reliability of the test conditions.

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