Anti-sand type auxiliary switch and testing device thereof

Abstract

The utility model relates to electronic device technical field, specifically disclose a kind of wind-sand-resistant auxiliary switch and its testing device;The wind-sand-resistant auxiliary switch includes first cover, second cover and several groups of contact box assembly, first cover and second cover end portion are equipped with the sealing assembly of shaft sleeve, annular groove and O type sealing ring, contact box assembly is formed by the dustproof channel of labyrinthus through installation boss and installation recess, dustproof groove, dustproof boss and sealing block are equipped at contact patch groove, realize multidimensional wind-sand protection;Square shaft is equipped with insulating sleeve outside and is connected with movable contact group card, can drive movable contact group rotation and scrape off oxide film or foreign matter on static contact group, guarantee contact contact reliability, fastening bolt is penetrated installation through-hole, realize the stable assembly of cover and contact box assembly.The testing device includes test room, dust fan, vibration generator and drive motor, can simulate real wind-sand and vibration environment, accurately test switch wind-sand resistance performance.

Description

Technical Field

[0001] This utility model relates to the field of electronic device technology, and in particular to a wind and sand resistant auxiliary switch and its testing device. Background Technology

[0002] Auxiliary switches, as core control components of power equipment such as high-voltage circuit breakers and disconnectors, undertake critical functions such as secondary circuit opening and closing control, signal transmission, and interlocking protection, and are widely used in power plants, indoor and outdoor substations. The structural design of existing ordinary auxiliary switches often lacks specific protection against wind and sand environments. The mating points between the cover plate and the rotating shaft, the joints of multiple contact boxes, and the contact plate mounting slots typically employ only simple clearance fits or single-seal structures, resulting in limited sealing performance and dustproofing. During wind and sandstorms, dust can easily penetrate the switch's interior through these gaps. On one hand, it adheres to the surfaces of stationary and moving contacts, forming an insulating layer or causing poor contact, leading to switch failure, signal transmission interruption, and other problems. On the other hand, the infiltrated dust enters mechanical transmission parts, causing accelerated wear on components such as bushings and square shafts, and even jamming, significantly shortening the switch's service life. In severe cases, it can even cause related electrical equipment to shut down, resulting in economic losses.

[0003] Meanwhile, regarding the wind and sand resistance performance of auxiliary switches, there is currently a lack of specialized testing equipment that can simulate real wind and sand environments. It is difficult to accurately verify their operational reliability in wind and sand environments before the products leave the factory. As a result, some products are prone to frequent failures due to insufficient wind and sand resistance after being put into actual use, and cannot meet the long-term stable operation requirements of auxiliary switches in wind and sand scenarios.

[0004] Therefore, developing a wind-resistant auxiliary switch with all-round wind and sand protection capabilities, stable and reliable structure, and equipped with targeted testing devices has become the key to solving the above-mentioned technical problems. It is of great significance for expanding the application scenarios of auxiliary switches and improving the operational stability of related electrical equipment in harsh environments. Utility Model Content

[0005] In view of this, the present invention provides a wind and sand resistant auxiliary switch and its testing device to solve the technical problem that in the prior art, ordinary auxiliary switches are prone to wind and sand intrusion into the switch through key parts such as the end gap of the cover plate, the joint of the contact box assembly, and the contact plate groove in wind and sand environment, which leads to wear of internal mechanical transmission components, and the contact surface being covered or stuck by wind and sand, thereby causing switch failure, shortened service life and reduced operational stability.

[0006] In a first aspect, this utility model embodiment provides a wind and sand resistant auxiliary switch, comprising:

[0007] A first cover plate and a second cover plate, and a plurality of contact box assemblies disposed between the first cover plate and the second cover plate;

[0008] Both the first cover plate and the second cover plate are provided with sealing components at their ends to prevent wind and sand from entering the switch from the ends of the first cover plate and the second cover plate.

[0009] The contact box assembly includes a static contact group that connects to external electrical appliances, and a moving contact group that connects or disconnects the static contact group.

[0010] The first cover plate, the second cover plate, and the contact box assembly are provided with a square shaft, which can drive the moving contact plate group to rotate, so as to scrape off the oxide film or foreign matter on the stationary contact plate group.

[0011] Preferably, the contact box assembly further includes a contact box for housing the stationary contact group and the moving contact group;

[0012] The contact box includes a first boss and a second boss, and a contact movable groove disposed between the first boss and the second boss.

[0013] Preferably, mounting portions are provided on the top of both sides of the second boss;

[0014] The mounting part includes a mounting boss and a mounting groove provided at the bottom of the mounting boss;

[0015] The inner side of the mounting boss is stepped.

[0016] When the two contact boxes are installed together by the mounting part, the mounting boss and the mounting groove are combined to form a labyrinthine dustproof channel to prevent wind from entering the switch through the joint of the contact box assembly.

[0017] Preferably, the mounting part is provided with a mounting through hole, and a fastening bolt is provided through the mounting through hole from the first cover plate to the second cover plate to fasten the first cover plate, the second cover plate and the contact box assembly.

[0018] Preferably, the square shaft is a metal shaft, and an insulating sleeve is provided on the outside of the square shaft, and the square shaft is engaged with the moving contact assembly through the insulating sleeve.

[0019] Preferably, the sealing assembly includes a bushing with an annular groove in which an O-ring is installed;

[0020] The inner side of the bushing is provided with a small raised sealing line. The sealing line surrounds the square shaft and is always in close contact with the inner wall of the square shaft and the bushing to limit the entry of wind and sand into the gap.

[0021] After installation, the O-ring seal fits tightly against the sidewall of the adjacent component to prevent dust from entering the interior from the end of the switch.

[0022] Preferably, the contact box is provided with a contact slot to accommodate the stationary contact assembly;

[0023] The contact slot includes a first slot, a second slot, and a third slot;

[0024] The contact box is provided with a dustproof groove and a dustproof protrusion at the first slot, and the dustproof groove and the dustproof protrusion cooperate to prevent wind and sand from entering the inside of the switch through the contact groove.

[0025] Preferably, a sealing block is provided at a position where the first cover plate matches the first slot, and the sealing block is used to seal the first slot of the adjacent contact box.

[0026] In a first aspect, embodiments of this utility model provide a testing device for a wind- and sand-resistant auxiliary switch, comprising:

[0027] The test chamber, and the sandstorm simulation components set in the test chamber;

[0028] The square shaft of the switch is connected to the drive motor via a coupling to drive the square shaft to rotate the moving contact assembly;

[0029] The switch has an output component and a receiving component connected to both ends via a stationary contact assembly. The switch is driven by a drive motor to rotate the square shaft, thereby testing the working status of the switch.

[0030] Preferably, the sandstorm simulation component includes at least two dust-suppressing fans arranged around the switch, and a vibration generator for causing the test chamber to vibrate to simulate a sandstorm environment.

[0031] The wind- and sand-resistant auxiliary switch and its testing device provided by this utility model have the following beneficial effects:

[0032] In this invention, the anti-sand auxiliary switch constructs a comprehensive and multi-dimensional sand and dust protection system through a multi-seal structure of the end sealing component's bushing, annular groove, and O-ring; a labyrinthine dustproof channel formed by the mounting boss and mounting groove of the contact box; and a collaborative sealing design of the dustproof groove, dustproof protrusion, and sealing block at the contact slot. This effectively prevents sand and dust from entering the switch from key gaps such as the end of the cover plate, component joints, and contact slots, significantly reducing the wear risk of internal mechanical transmission components and the probability of contact jamming. At the same time, the sand-scraping structure that drives the rotating contact group with the square shaft can actively remove sand and dust adhering to the surface of the stationary contact group. Combined with the insulation protection of the insulating sleeve, this ensures the reliability of contact and avoids switching failure, while also improving the safety of circuit operation. In addition, the fastening bolts securely assemble the overall structure, achieving a synergistic improvement in protective performance and structural stability. This allows the switch to maintain stable switching function even in harsh environments such as sandstorms, extending its service life and meeting the long-term use requirements in outdoor sandstorm scenarios. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments of this utility model will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, and these are all within the protection scope of this utility model.

[0034] Figure 1 It is a cross-sectional structure of a wind and sand resistant auxiliary switch.

[0035] Figure 2 Schematic diagram of the contact box assembly;

[0036] Figure 3 This is a schematic diagram of the contact box structure;

[0037] Figure 4 This is a schematic diagram of the bottom structure of the first cover plate;

[0038] Figure 5 This is a schematic diagram of the testing device;

[0039] Parts and component numbers in the diagram:

[0040] 110-First cover plate, 111-Sealing block, 120-Second cover plate, 131-Shaft sleeve, 132-Annular groove, 133-O-ring seal, 140-Square shaft, 141-Insulating sleeve;

[0041] 200-Contact box assembly, 210-Contact box, 211-First boss, 212-Second boss, 213-Modible groove, 221-Mounting boss, 222-Mounting groove, 223-Dustproof channel, 224-Mounting through hole, 225-Fasting bolt, 230-Contact slot, 231-First slot, 232-Second slot, 233-Third slot, 234-Dustproof groove, 235-Dustproof protrusion, 240-Static contact assembly, 250-Modible contact assembly;

[0042] 310-Test room, 320-Switch, 330-Drive motor, 331-Coupling, 340-Dust-suppressing fan, 350-Vibration generator. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. It should be noted that, in this document, relational terms such as "first" and "second" are merely used to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. In the description of this utility model, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. Unless otherwise specified, embodiments of the present invention and the various features thereof can be combined with each other, all within the protection scope of the present invention.

[0044] Example 1

[0045] Please see Figure 1This utility model embodiment provides a wind and sand resistant auxiliary switch. As a key component in an electrical system for circuit interlocking and signal feedback, the reliability of the auxiliary switch directly determines the safety and stability of the electrical system. However, the dust protection design of existing auxiliary switches has obvious shortcomings. The joint between the cover plate and the rotating shaft, and the joint of the contact box 210, mostly use a single gap seal, which has weak protection capabilities. In a windy and sandy environment, sand and dust can easily penetrate into the interior of the switch 320 through these gaps. This not only causes sand and dust to accumulate on the surface of the stationary and moving contact pieces, resulting in poor contact and failure to switch on or off, but also causes abrasive wear and rotational jamming of mechanical parts such as the square shaft 140 and the bushing 131, increasing the gap and further aggravating the problem of wind and sand intrusion. Moreover, there is a lack of testing methods that can simulate the coupling conditions of real wind and sand and vibration, making it difficult to ensure the reliability of the product in harsh environments and seriously limiting the application of auxiliary switches in windy and sandy scenarios.

[0046] The auxiliary switch includes: a first cover plate 110 and a second cover plate 120, and a plurality of contact box assemblies 200 disposed between the first cover plate 110 and the second cover plate 120;

[0047] The ends of the first cover plate 110 and the second cover plate 120 are provided with sealing components to prevent wind and sand from entering the interior of the switch 320 from the ends of the first cover plate 110 and the second cover plate 120.

[0048] The contact box assembly 200 includes a stationary contact piece group 240 that is connected to an external electrical appliance, and a moving contact piece group 250 that connects or disconnects the stationary contact piece group 240.

[0049] A square shaft 140 is provided through the first cover plate 110, the second cover plate 120 and the contact box assembly 200. The square shaft 140 is engaged with the moving contact piece group 250 and can drive the moving contact piece group 250 to rotate in order to scrape away the sand and dust on the stationary contact piece group 240.

[0050] During assembly, the second cover plate 120, contact box assembly 200, and first cover plate 110 must be installed sequentially from bottom to top. In this assembly process, a square shaft 140 is inserted into the second cover plate 120, contact box assembly 200, and first cover plate 110, and this square shaft 140 can rotate using the first cover plate 110, second cover plate 120, and contact box assembly 200 as support. When the square shaft 140 rotates, it drives the moving contact assembly 250 to rotate as well, allowing the moving contact assembly 250 to come into contact with or separate from the stationary contact assembly 240. The purpose of this contact / separation action is to scrape away the oxide film and foreign matter on the stationary contact assembly 240.

[0051] Specifically, during the long-term operation of electrical equipment, the metal contacts on the stationary and moving contacts are continuously exposed to the air. Because the air contains oxygen, moisture, and may also contain corrosive gases, these metal contacts inevitably undergo various chemical reactions with these substances. Under these conditions, an oxide film gradually forms on the surface of the metal contacts.

[0052] The dust-scraping function of the moving contact plays a crucial role in the opening and closing operations of the equipment. During these operations, the moving contact slides relative to the stationary contact and experiences elastic compression. Through this sliding and compression, the moving contact continuously cleans the contact surface. This cleaning process effectively disrupts and removes the conditions for oxide film formation, thus preventing various contact problems caused by the continuous accumulation of oxide film. This further ensures that the auxiliary switch maintains stable switching performance even in harsh environments filled with dust, guaranteeing the normal operation of the entire electrical system.

[0053] Further, please see Figure 2 The contact box assembly 200 further includes a contact box 210 for placing the stationary contact group 240 and the moving contact group 250; the contact box 210 includes a first boss 211 and a second boss 212, and a movable groove 213 disposed between the first boss 211 and the second boss 212.

[0054] Specifically, the movable contact piece group 250 is disposed on the first boss 211, and the stationary contact piece group 240 is disposed on the second boss 212. When the movable contact piece group 250 rotates based on the first boss 211, the part of the movable contact piece group 250 that is used to contact the stationary contact piece group 240 rotates through the position of the movable groove 213 to contact or disengage from the stationary contact piece group 240.

[0055] Further, please see Figure 1 The second boss 212 has mounting portions on both sides of its top; each mounting portion includes a mounting boss 221 and a mounting groove 222 located at the bottom of the mounting boss 221; the inner side of the mounting boss 221 is stepped.

[0056] When the two contact boxes 210 are installed together by the mounting part, the mounting boss 221 and the mounting groove 222 are combined to form a labyrinthine dustproof channel 223 to prevent wind and sand from entering the inside of the switch 320 through the joint of the contact box assembly 200.

[0057] Specifically, in this embodiment, by constructing a maze-like dustproof channel 223, the cleanliness of the inside of the switch 320 can be significantly improved, reducing the risk of malfunctions such as contact oxidation and poor contact caused by sand and dust intrusion, thereby enhancing the long-term stable operation capability of the entire auxiliary switch in complex dusty environments. Simultaneously, the stepped mounting bosses 221, on the inner side, not only enhance the structural connection stability but also form multiple barriers against tiny particles that may enter the joint, further strengthening the dustproof effect and ensuring that the contact box assembly 200 maintains good sealing performance throughout long-term use.

[0058] Furthermore, the mounting part is provided with a mounting through hole 224, and the mounting through hole 224 is provided with fastening bolts 225 through the first cover plate 110 to the second cover plate 120 to fasten the first cover plate 110, the second cover plate 120 and the contact box assembly 200.

[0059] Specifically, the mounting part is connected to the first cover plate 110, the second cover plate 120, and the contact box assembly 200 by fastening bolts 225 passing through the mounting through hole 224. This forms a stable overall structure that effectively resists the impact of external vibrations or impacts on the assembly connection. Simultaneously, this fastening method further reduces the gap between the mating surfaces of the mounting part, forming a double protection with the labyrinthine dustproof channel 223. This ensures the mechanical strength of the structure while preventing a decrease in the sealing performance of the dustproof channel 223 due to loose connections. Thus, while ensuring reliable assembly fixation, it indirectly enhances the overall dustproof and structural stability.

[0060] Furthermore, the square shaft 140 is a metal shaft, and an insulating sleeve 141 is fitted around the outside of the square shaft 140.

[0061] Further, please see Figure 1 The sealing assembly includes a bushing 131, on which an annular groove 132 is provided, and an O-ring seal 133 is installed in the annular groove 132;

[0062] The inner side of the bushing 131 is provided with a small protruding sealing line. The sealing line surrounds the square shaft 140 and is always in close contact with the inner wall of the square shaft 140 and the bushing 131 to limit the entry of wind and sand into the gap.

[0063] After installation, the O-ring 133 fits tightly against the sidewall of the adjacent component to prevent sand and dust from entering the interior from the end of the switch 320.

[0064] Specifically, the sealing assembly, through the cooperation of the bushing 131 and the O-ring 133, forms a double sealing barrier at the connection between the square shaft 140 and the switch 320 housing. The O-ring 133 within the annular groove 132 utilizes its elastic properties to generate a continuous pre-tightening force against the sidewalls of adjacent components after assembly, effectively blocking the path of sand and dust intruding along the gaps between components. Meanwhile, the sealing line on the inner side of the bushing 131 forms the first physical barrier through its tight fit with the surface of the square shaft 140. Its tiny protrusions can scrape and block windblown sand particles, preventing poor contact and thus leading to a series of malfunctions such as signal transmission interruption, severely affecting the normal operation of the equipment.

[0065] During the opening and closing operation, the moving contact slides relative to the stationary contact and also experiences elastic compression. Through this relative sliding and elastic compression, the moving contact continuously cleans the surface of the contact. This cleaning process effectively disrupts and removes the conditions for oxide film formation, thus preventing various contact problems caused by the continuous accumulation of oxide film. This further ensures that the auxiliary switch maintains stable switching performance even in harsh environments filled with dust, guaranteeing the normal operation of the entire electrical equipment system.

[0066] Further, please see Figure 1 and Figure 2 The contact box assembly 200 further includes a contact box 210 for placing the stationary contact group 240 and the moving contact group 250; the contact box 210 includes a first boss 211 and a second boss 212, and a movable groove 213 disposed between the first boss 211 and the second boss 212.

[0067] Specifically, the movable contact piece group 250 is disposed on the first boss 211, and the stationary contact piece group 240 is disposed on the second boss 212. When the movable contact piece group 250 rotates based on the first boss 211, the part of the movable contact piece group 250 that is used to contact the stationary contact piece group 240 rotates through the position of the movable groove 213 to contact or disengage from the stationary contact piece group 240.

[0068] Furthermore, the top of both sides of the second boss 212 are respectively provided with mounting portions; the mounting portions include mounting bosses 221 and mounting grooves 222 provided at the bottom of the mounting bosses 221; the inner side of the mounting bosses 221 is stepped.

[0069] When the two contact boxes 210 are installed together by the mounting part, the mounting boss 221 and the mounting groove 222 are combined to form a labyrinthine dustproof channel 223 to prevent wind and sand from entering the inside of the switch 320 through the joint of the contact box assembly 200.

[0070] Specifically, in this embodiment, by constructing a maze-like dustproof channel 223, the cleanliness of the inside of the switch 320 can be significantly improved, reducing the risk of malfunctions such as contact oxidation and poor contact caused by sand and dust intrusion, thereby enhancing the long-term stable operation capability of the entire auxiliary switch in complex dusty environments. Simultaneously, the stepped mounting bosses 221, on the inner side, not only enhance the structural connection stability but also form multiple barriers against tiny particles that may enter the joint, further strengthening the dustproof effect and ensuring that the contact box assembly 200 maintains good sealing performance throughout long-term use.

[0071] Further, please see Figure 1 The mounting part is provided with a mounting through hole 224, and fastening bolts 225 are provided through the mounting through hole 224 from the first cover plate 110 to the second cover plate 120 to fasten the first cover plate 110, the second cover plate 120 and the contact box assembly 200.

[0072] Specifically, the mounting part is connected to the first cover plate 110, the second cover plate 120, and the contact box assembly 200 by fastening bolts 225 passing through the mounting through hole 224. This forms a stable overall structure that effectively resists the impact of external vibrations or impacts on the assembly connection. Simultaneously, this fastening method further reduces the gap between the mating surfaces of the mounting part, forming a double protection with the labyrinthine dustproof channel 223. This ensures the mechanical strength of the structure while preventing a decrease in the sealing performance of the dustproof channel 223 due to loose connections. Thus, while ensuring reliable assembly fixation, it indirectly enhances the overall dustproof and structural stability.

[0073] Furthermore, the square shaft 140 is a metal shaft, and an insulating sleeve 141 is fitted around the outside of the square shaft 140.

[0074] Further, please see Figure 1 The sealing assembly includes a bushing 131, on which an annular groove 132 is provided, and an O-ring seal 133 is installed in the annular groove 132;

[0075] The inner side of the bushing 131 is provided with a small protruding sealing line. The sealing line surrounds the square shaft 140 and is always in close contact with the inner wall of the square shaft 140 and the bushing 131 to limit the entry of wind and sand into the gap.

[0076] After installation, the O-ring 133 fits tightly against the sidewall of the adjacent component to prevent sand and dust from entering the interior from the end of the switch 320.

[0077] Specifically, the sealing assembly, through the cooperation of the bushing 131 and the O-ring 133, forms a double sealing barrier at the connection between the square shaft 140 and the switch 320 housing. The O-ring 133 within the annular groove 132 utilizes its elastic properties to generate a continuous pre-tightening force against the sidewalls of adjacent components after assembly, effectively blocking the path of sand and dust intruding along the gaps between components. Meanwhile, the sealing line on the inner side of the bushing 131, through its tight fit with the surface of the square shaft 140, forms the first physical barrier. Its tiny protrusions can scrape and block windblown sand particles. Combined with the subsequent sealing of the O-ring 133, this significantly improves the overall sealing level of the switch 320 end, ensuring that critical internal components remain clean even in harsh environments with high winds, sand, and dust, reducing the incidence of equipment failure due to seal failure.

[0078] Further, please see Figure 3 The contact box 210 is provided with a contact groove 230 for accommodating the stationary contact assembly 240; the contact groove 230 includes a first groove 231, a second groove 232 and a third groove 233; the contact box 210 is provided with a dustproof groove 234 and a dustproof protrusion 235 at the position of the first groove 231, and the dustproof groove 234 and the dustproof protrusion 235 cooperate to prevent wind and sand from entering the interior of the switch 320 through the contact groove 230.

[0079] Specifically, in this embodiment, a dustproof structure is formed by setting a matching dustproof groove 234 and a dustproof protrusion 235 at the first groove opening 231 of the contact groove 230. When external wind and sand attempt to enter the interior of the switch 320 through the contact groove 230, the dustproof protrusion 235 can initially block larger particles of wind and sand, making it difficult for them to directly enter the groove; while the dustproof groove 234 can further intercept fine sand and dust that passes through the protrusion, extending the path of wind and sand and increasing flow resistance. This structural design, by combining physical barrier and path extension, further enhances the sealing performance of the contact groove 230. It works in conjunction with the double sealing barrier formed by the aforementioned sealing components at the end of the switch 320 to build a comprehensive dustproof system from different key parts, effectively preventing wind and sand from entering the interior of the switch 320 through the potential channel of the contact groove 230, ensuring the stable operation of internal components such as the stationary contact group 240 in complex environments, and improving the overall environmental adaptability and service life of the switch 320.

[0080] Further, please see Figure 4A sealing block 111 is provided at the position where the first cover plate 110 is adapted to the first slot 231, and the sealing block 111 is used to seal the first slot 231 of the adjacent contact box 210.

[0081] Specifically, by setting a sealing block 111 at the matching position between the first cover plate 110 and the first slot 231, a direct physical seal can be formed on the gap between adjacent contact boxes 210 in the first slot 231. The sealing block 111 and the first cover plate 110 are integrally cast; in use, after the first cover plate 110 is installed and fixed, the sealing block 111 will fit tightly against the edge of the first slot 231 to fill any gaps that may exist at the slot and prevent external impurities such as wind, sand, and moisture from seeping in through the connection part of adjacent contact boxes 210.

[0082] This design complements the dustproof groove 234 and dustproof protrusion 235 structure of the contact box 210 itself. The former focuses on the internal dustproofing of the contact plate groove 230 of a single contact box 210, while the latter seals the gaps in the grooves generated when multiple contact boxes 210 are assembled. Together, they build a complete dustproof sealing network from the individual contact box 210 to the overall assembly level, further improving the sealing reliability of the switch 320 in multi-unit combination scenarios, ensuring that the connection area between adjacent contact boxes 210 will not become a new weak point in dustproofing. In conjunction with the sealing components at the end of the switch 320 and the labyrinth structure of the contact box 210, it comprehensively protects the cleanliness of the internal environment of the switch 320.

[0083] Example 2

[0084] Please see Figure 5 This utility model provides a testing device for a sand-resistant auxiliary switch. In the research and development and mass production of auxiliary switches for sandy environments, accurate verification of their sand-resistant performance is a key link to ensure product reliability. Traditional tests often use simple sand spraying or static dust generation methods, which cannot simulate the coupled working conditions of airflow-driven sand movement, environmental vibration, and dynamic operation of the switch 320 in real scenarios, resulting in a large deviation between the test environment and the actual use scenario. Some testing devices can only simulate sand or vibration individually, lacking consideration of the synergistic effect of the two, making it difficult to fully reflect the performance of the switch 320 under the superposition of sand and mechanical vibration. This limits the reference value of the test results, making it difficult to effectively guide product optimization design and provide reliable performance evaluation basis for product delivery, thus restricting the research and development efficiency and quality control of sand-resistant auxiliary switches.

[0085] Please see Figure 5 In this embodiment, a test device for a wind and sand resistant auxiliary switch is provided. The test device includes a test chamber 310 and a wind and sand simulation component disposed in the test chamber 310.

[0086] The square shaft 140 of the switch 320 is connected to the drive motor 330 via a coupling 331 to drive the square shaft 140 to rotate the moving contact assembly 250.

[0087] The switch 320 has an output component and a receiving component connected to its two ends via a stationary contact assembly 240. The switch 320 drives the square shaft 140 to rotate via the drive motor 330, thereby testing the working status of the switch 320.

[0088] Furthermore, the sandstorm simulation component includes at least two dust-suppressing fans 340 arranged around the switch 320, and a vibration generator 350 for causing the test chamber 310 to vibrate to simulate a sandstorm environment.

[0089] During testing, the sandstorm simulation component is first activated. A dust-generating fan 340 continuously delivers sand particles of a preset concentration and size into the test chamber 310. A vibration generator 350 generates a vibration frequency and amplitude in the test chamber 310 that matches actual working conditions, creating a complex environment where sandstorms and vibration interact. Subsequently, the drive motor 330 is activated, driving the square shaft 140 of the switch 320 to rotate at a set speed and angle via a coupling 331. This causes the moving contact group 250 to dynamically contact and separate from the stationary contact group 240, simulating the actual operation of the switch 320. During this period, the output component continuously applies operating signals to the switch 320, while the receiving component collects key parameters such as the switch 320's on / off state, contact resistance, and response time in real time, transmitting the data to an external analysis terminal.

[0090] During the test, by adjusting the wind speed of the dust-generating fan 340, the dust concentration, and the vibration parameters of the vibration generator 350, the coupling environment of wind and sand with vibration of different intensities was simulated. Simultaneously, the rotation cycle and load conditions of the drive motor 330 were controlled to fully reproduce the complex operating conditions that the switch 320 might face under dynamic working conditions. The analysis terminal monitors and records the data collected by the receiving components in real time, plotting the performance parameters of the switch 320 over the test time. When parameters exhibit abnormal fluctuations or reach a preset failure threshold, the corresponding wind and sand intensity, vibration parameters, and operating status are automatically marked. This allows for precise identification of the functional attenuation law and failure threshold of the switch 320 under the combined effects of wind, sand, and vibration, providing reliable experimental data support for the structural optimization and performance improvement of wind-resistant auxiliary switches.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A wind- and sand-resistant auxiliary switch, characterized in that, include: A first cover plate (110) and a second cover plate (120), and a plurality of contact box assemblies (200) disposed between the first cover plate (110) and the second cover plate (120); The ends of the first cover plate (110) and the second cover plate (120) are provided with sealing components to prevent wind and sand from entering the switch (320) from the ends of the first cover plate (110) and the second cover plate (120); The contact box assembly (200) is provided with a stationary contact group (240) that is connected to an external electrical appliance, and a moving contact group (250) that connects or disconnects the stationary contact group (240). A square shaft (140) is provided through the first cover plate (110), the second cover plate (120) and the contact box assembly (200), which can drive the moving contact assembly (250) to rotate, so as to scrape off the oxide film or foreign matter on the stationary contact assembly (240).

2. The wind-resistant auxiliary switch according to claim 1, characterized in that, The contact box assembly (200) further includes a contact box (210) for holding the stationary contact group (240) and the moving contact group (250); The contact box (210) includes a first boss (211) and a second boss (212), and a contact movable groove (213) disposed between the first boss (211) and the second boss (212).

3. The wind-resistant auxiliary switch according to claim 2, characterized in that, The second boss (212) has mounting parts on both sides of its top. The mounting part includes a mounting boss (221) and a mounting groove (222) provided at the bottom of the mounting boss (221); The inner side of the mounting boss (221) is stepped; When the two contact boxes (210) are installed together by the mounting part, the mounting boss (221) and the mounting groove (222) are combined to form a labyrinthine dustproof channel (223) to prevent wind and sand from entering the switch (320) through the joint of the contact box assembly (200).

4. The wind-resistant auxiliary switch according to claim 3, characterized in that, The mounting part is provided with a mounting through hole (224), and the mounting through hole (224) is provided with fastening bolts (225) through the first cover plate (110) to the second cover plate (120) to fasten the first cover plate (110), the second cover plate (120) and the contact box assembly (200).

5. The wind-resistant auxiliary switch according to claim 1, characterized in that, The square shaft (140) is a metal shaft, and an insulating sleeve (141) is fitted on the outside of the square shaft (140). The square shaft (140) is engaged with the moving contact assembly (250) through the insulating sleeve (141).

6. The wind-resistant auxiliary switch according to claim 1, characterized in that, The sealing assembly includes a bushing (131) with an annular groove (132) on the bushing (131) and an O-ring (133) installed in the annular groove (132). The inner side of the bushing (131) is provided with a small protruding sealing line. The sealing line surrounds the square shaft (140) and is always in close contact with the inner wall of the square shaft (140) and the bushing (131) to limit the entry of wind and sand into the gap. After installation, the O-ring (133) fits tightly against the sidewall of the adjacent component to prevent dust from entering the interior from the end of the switch (320).

7. The wind-resistant auxiliary switch according to claim 2, characterized in that, The contact box (210) is provided with a contact slot (230) for accommodating the stationary contact assembly (240); The contact groove (230) includes a first groove (231), a second groove (232) and a third groove (233); The contact box (210) is provided with a dustproof groove (234) and a dustproof protrusion (235) at the first slot (231), and the dustproof groove (234) and the dustproof protrusion (235) cooperate to prevent wind and sand from entering the inside of the switch (320) through the contact groove (230).

8. The wind-resistant auxiliary switch according to claim 7, characterized in that, A sealing block (111) is provided at a position that matches the first cover plate (110) and the first slot (231), and the sealing block (111) seals the first slot (231) of the adjacent contact box (210).

9. A testing device for a sand-resistant auxiliary switch, used for testing the sand-resistant auxiliary switch according to any one of claims 1-8; characterized in that, include: Test chamber (310), and sandstorm simulation components disposed in the test chamber (310); The square shaft (140) of the switch (320) is connected to the drive motor (330) via a coupling (331) to drive the square shaft (140) to rotate the moving contact assembly (250); The switch (320) has an output component and a receiving component connected to its two ends via a stationary contact assembly (240). The switch (320) drives the square shaft (140) via the drive motor (330) to rotate the moving contact assembly (250) in order to test the working status of the switch (320).

10. The testing device for the wind-resistant auxiliary switch according to claim 9, characterized in that, The sandstorm simulation assembly includes at least two dust-suppressing fans (340) arranged around the switch (320) and a vibration generator (350) for causing the test chamber (310) to vibrate to simulate a sandstorm environment.

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