A contact box assembly and auxiliary switch for a wind- and sand-resistant auxiliary switch

Abstract

This utility model relates to the field of electronic device technology, specifically disclosing a contact box assembly and an auxiliary switch for a sand-resistant auxiliary switch. The contact box assembly includes a contact box with a first boss, a second boss, and a slot; a stationary contact piece disposed within a contact piece slot; and first / second moving contacts arranged opposite each other, each with a contact piece body, a snap-fit ​​hole, and a limiting piece. The auxiliary switch includes a first / second cover plate, a drive shaft, and a sealing block. The drive shaft snaps into the snap-fit ​​hole of the moving contact piece to drive its rotation, and a bushing with a sealing groove and a sealing ring is provided at the drive shaft connection. This solution achieves all-around sealing through the cooperation of the dustproof groove and dustproof protrusion, the sealing piece, and the bushing sealing ring. Combined with the friction reduction from the sliding protrusion and the stable assembly of the connecting protrusion and the groove, it effectively blocks the intrusion of sand and dust, ensures reliable switching of the moving / stationary contacts, reduces contact wear, extends service life, and meets the stable use requirements in harsh sandy environments.

Description

Technical Field

[0001] This utility model relates to the field of electronic device technology, and in particular to a contact box assembly and auxiliary switch for a sand-resistant auxiliary switch. Background Technology

[0002] In fields such as power systems, rail transit, and industrial control, auxiliary switches are widely used in circuit breakers, disconnectors, and other equipment as key control and signal conversion components. Their core function is to switch circuits, transmit signals, and monitor equipment status by connecting or disconnecting internal moving and stationary contacts, which directly affects the stable operation of the entire system.

[0003] Auxiliary switches are important supporting components for circuit breakers, disconnectors, grounding switches, etc., and are widely used in substations. Their demand is increasing in environments with frequent sandstorms, such as deserts, Gobi, open-pit mines, and dusty factory areas. However, the existing auxiliary switch design has significant shortcomings in terms of wind and sand protection: On the one hand, the contact boxes of existing auxiliary switches mostly adopt an open or simple closed structure. The connection ports connecting the contact slots and empty slots, the assembly gaps between adjacent components, and the mating points where the drive shaft passes through the cover plate and the contact box generally lack effective sealing protection design, allowing wind and sand to easily penetrate into the contact box through these gaps. On the other hand, the contact parts of the moving and stationary contacts are directly exposed to the internal space of the contact box, and their contact depends on precise relative movement. When sand, dust, or other foreign objects intrude, they not only adhere to the contact surface to form an insulating layer, leading to increased contact resistance between the moving and stationary contacts and causing problems such as poor contact and signal transmission interruption, but may also get stuck in the rotation or sliding path of the moving contact, causing the moving contact to fail to operate normally and rendering the auxiliary switch's on / off function ineffective.

[0004] More seriously, the intruding sand and dust will cause continuous mechanical wear on the contact surface during the relative movement of the moving and stationary contacts, damaging the coating or oxide film on the contact surface, accelerating the oxidation and corrosion of the contacts, significantly shortening the service life of the contacts, and thus leading to an increase in the maintenance frequency of auxiliary switches, or even causing the shutdown of the entire control system due to sudden failures, bringing huge safety hazards and economic losses to the production and operation of related fields.

[0005] Currently, industry improvements to the protection of auxiliary switches in sandy environments largely limit themselves to adding simple dust covers or applying sealing strips to gaps. These methods not only fail to fundamentally block sand from entering the contact box, but the dust covers are also susceptible to damage from external forces, and the sealing strips are prone to aging and failure after long-term use, resulting in unsustainable protection and failing to meet the long-term stable operation requirements of auxiliary switches in sandy environments. Therefore, there is an urgent need for an auxiliary switch and matching contact box assembly that can effectively solve the problem of sand intrusion and ensure the reliability of contact. Utility Model Content

[0006] In view of this, the present invention provides a contact box assembly and auxiliary switch for a sand-resistant auxiliary switch, which solves the technical problem in the prior art where, when the auxiliary switch is used in a sandy environment, sand can easily enter the interior through gaps such as the connection port, assembly gap, and drive shaft penetration of the contact box, causing sand particles, dust or foreign objects to adhere to the contact surface of the moving contact and stationary contact, leading to poor contact, failure of conduction / disconnection action, and even accelerated contact wear and oxidation, ultimately reducing the reliability and service life of the auxiliary switch.

[0007] In a first aspect, embodiments of this utility model provide a contact box assembly for a wind- and sand-resistant auxiliary switch, comprising:

[0008] The contact box includes a first boss and a second boss, and a slot disposed between the first boss and the second boss; the four corners of the contact box are also provided with contact slots.

[0009] The movable contact assembly includes a first movable contact and a second movable contact with identical structures and arranged in opposite directions. The movable contact assembly is disposed on the first boss and can rotate based on the first boss.

[0010] A stationary contact assembly includes at least one pair of stationary contacts disposed in the contact slot. Each stationary contact includes a first connecting piece and a second connecting piece. The first connecting piece is used to connect with the moving contact assembly, and the second connecting piece is used to connect with an external electronic device.

[0011] The moving contact group enables at least one pair of stationary contacts to be switched on or off by rotating based on the first boss.

[0012] Preferably, the first movable contact includes a contact body and a snap-fit ​​hole disposed on the contact body, and the two ends of the contact body are respectively provided with a first contact and a second contact;

[0013] The first and second contacts of the first and second movable contact pieces are arranged opposite to each other and in contact, and both ends are open to facilitate the contact or disengagement of the stationary contact piece with the first and second contacts of the first and second movable contact pieces.

[0014] When the stationary contact piece comes into contact with the first and second contacts of the first and second movable contact pieces, the stationary contact piece is engaged with the first and second contacts of the first and second movable contact pieces.

[0015] Preferably, a first limiting piece and a second limiting piece are respectively provided on both sides of the contact body;

[0016] The first limiting piece and the second limiting piece are used to restrict the position of the stationary or moving movable contact piece group on the first protrusion.

[0017] Preferably, the contact body is further provided with a plurality of sliding protrusions, and the first movable contact and / or the second movable contact contact contacts the first boss through the sliding protrusions, so that the first movable contact and / or the second movable contact slides with the first boss.

[0018] Preferably, the contact box has a first connecting protrusion and a second connecting protrusion on both sides;

[0019] The bottom of the first connecting protrusion and the second connecting protrusion are respectively provided with a first connecting groove and a second connecting groove;

[0020] The two contact boxes can be assembled and connected to each other through the first connecting protrusion and the first connecting groove, the second connecting protrusion and the second connecting groove of the two contacts.

[0021] Preferably, the contact slot is provided with a first connection port communicating with the empty slot, and a second connection port and a third connection port communicating with the first connection port;

[0022] The first connection port is provided with a dustproof groove, the contact box is provided with a dustproof protrusion at the bottom corresponding to the dustproof groove, and the stationary contact piece is also provided with a groove at the position corresponding to the dustproof groove;

[0023] When the two contact boxes are connected, the dustproof grooves of the two contact boxes are connected to the dustproof protrusions to prevent wind and sand from entering the interior of the contact boxes through the second connection port and the third connection port.

[0024] Preferably, a sealing piece is provided on one side of the second connecting piece, the sealing piece being used to seal the second or third connecting port to prevent wind and sand from entering the contact box through the second or third connecting port.

[0025] In a second aspect, a wind- and sand-resistant auxiliary switch is provided, the auxiliary switch including a first cover plate and a second cover plate, and the contact box assembly is disposed between the first cover plate and the second cover plate;

[0026] The auxiliary switch also includes a drive shaft, which is disposed from the first cover plate into the contact box assembly and engages with the snap-fit ​​hole of the moving contact group to drive the moving contact group to rotate within the contact box;

[0027] The bottom of the first cover plate is provided with a sealing block for closing the first connection port.

[0028] Preferably, the contact box adjacent to the first cover plate and the second cover plate is provided with a sealing structure at the connection between it and the drive shaft;

[0029] The sealing structure includes a bushing with a sealing groove and a sealing ring inside the sealing groove to prevent sand and dust from entering the interior from both ends of the auxiliary switch.

[0030] Preferably, a plurality of contact box assemblies are provided between the first cover plate and the second cover plate, which are assembled and connected by the first connecting protrusion and the first connecting groove, the second connecting protrusion and the second connecting groove.

[0031] The contact box assembly and auxiliary switch for a wind- and sand-resistant auxiliary switch provided by this utility model have the following beneficial effects:

[0032] This wind- and sand-resistant auxiliary switch and its matching contact box assembly specifically address the shortcomings of existing auxiliary switches in windy and sandy environments. Through the cooperation of the dustproof grooves in the contact box and the dustproof protrusions of adjacent components, the sealing plate design of the second connecting piece, and the sealing structure formed by the bushing and sealing ring at the drive shaft connection, a comprehensive seal is formed at key locations such as the connection port, assembly gap, and drive shaft penetration point. This effectively blocks the path of wind and sand intrusion, preventing sand particles from adhering to the contacts and causing poor contact or jamming of the moving contact. Simultaneously, the sliding protrusion design of the moving contact reduces friction, and the limiting plate ensures precise movement. Combined with the structure of multiple contact boxes with a secure assembly through connecting protrusions and connecting grooves, this ensures reliable switching action between the moving and stationary contacts while preventing assembly gaps from becoming new channels for wind and sand intrusion. This significantly reduces the risk of contact wear and corrosion, extends the service life of the auxiliary switch, and reduces the potential for system downtime. Furthermore, it eliminates the need for easily damaged or aging external dust covers or sealing strips, providing long-lasting and stable protection. It can meet the long-term stable operation requirements of auxiliary switches in power systems, rail transportation, and other fields in harsh windy and sandy environments such as deserts and dusty factory areas. 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 This is a schematic diagram of the auxiliary switch;

[0035] Figure 2 This is a cross-sectional view of the auxiliary switch.

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

[0037] Figure 4 This is a structural diagram of the contact box;

[0038] Figure 5 This is a schematic diagram of the moving contact assembly structure;

[0039] Figure 6 This is a schematic diagram of the first moving contact piece;

[0040] Figure 7 This is a schematic diagram of the bottom structure of the first cover plate;

[0041] Parts and component numbers in the diagram:

[0042] 100-Auxiliary switch, 110-First cover plate, 111-Blocking block, 120-Second cover plate, 130-Drive shaft;

[0043] 200-Contact box assembly, 210-Contact box, 211-First boss, 212-Second boss, 213-Gap, 220-Contact slot, 221-First connection port, 222-Dustproof slot, 223-Second connection port, 224-Third connection port, 225-First connection protrusion, 226-Second connection protrusion, 227-First connection groove, 228-Second connection groove;

[0044] 230-First movable contact piece, 231-Contact piece body, 232-Snap-fit ​​hole, 233-First contact, 234-Second contact, 235-First limiting piece, 236-Second limiting piece, 240-Second movable contact piece, 251-Sliding protrusion;

[0045] 260-Stationary contact piece, 261-First connecting piece, 262-Second connecting piece, 263-Blocking piece;

[0046] 310 - Shaft sleeve, 311 - Sealing groove, 312 - Sealing ring. Detailed Implementation

[0047] 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.

[0048] Example 1

[0049] Please see Figure 3 This utility model provides a contact box assembly for a wind and sand resistant auxiliary switch. In the power field, the auxiliary switch 100 is a key component for ensuring equipment circuit switching and signal transmission, and its reliability directly affects the stable operation of the entire system.

[0050] However, when the auxiliary switch 100 is used in sandy environments such as deserts, Gobi, and dusty factory areas, although it is protected by a mechanism box, sand can still enter when the cabinet door is opened. The shortcomings of the existing technology become increasingly apparent. The contact slot 220 connection port, component assembly gap, and drive shaft 130 through-hole of the contact box 210 lack an effective sealing and protection structure. Sand can easily enter the interior through these gaps, causing sand particles to adhere to the contact surface of the moving contact and stationary contact 260 or to be stuck by foreign objects, which in turn leads to poor contact and failure of switching action. At the same time, sand will accelerate contact wear and oxidation corrosion, shortening the service life of the auxiliary switch 100. The existing protection methods of using external dust covers or sealing strips cannot fundamentally block the sand intrusion path and are prone to damage and aging failure, making it difficult to meet the long-term stable operation requirements of the auxiliary switch 100 in sandy environments.

[0051] Please see Figure 3 and Figure 5 In this embodiment, a contact box assembly for a wind and sand resistant auxiliary switch is provided. The contact box assembly 200 includes a contact box 210 and a moving contact piece group and a stationary contact piece group 260 disposed in the contact box 210.

[0052] The contact box 210 includes a first boss 211 and a second boss 212, and a slot 213 disposed between the first boss 211 and the second boss 212; the four corners of the contact box 210 are also provided with contact plate slots 220.

[0053] The movable contact assembly includes a first movable contact 230 and a second movable contact 240 with identical structures and arranged in opposite directions. The movable contact assembly is disposed on the first boss 211 and can rotate based on the first boss 211.

[0054] The stationary contact assembly includes at least one pair of stationary contact pieces 260 disposed in the contact piece groove 220. Each stationary contact piece 260 includes a first connecting piece 261 and a second connecting piece 262. The first connecting piece 261 is used to connect with the moving contact assembly, and the second connecting piece 262 is used to connect with an external electronic device.

[0055] The moving contact group can turn on or off at least one pair of stationary contacts 260 by rotating based on the first boss 211.

[0056] During assembly, the moving contact assembly consisting of the first moving contact piece 230 and the second moving contact piece 240 is first installed on the first boss 211 of the contact box 210, and then the stationary contact assembly consisting of the first connecting piece 261 and the second connecting piece 262 is embedded into the contact slots 220 at the four corners of the contact box 210 to complete the assembly.

[0057] Since the contact slot 220 needs to be adapted to the connection of external electronic devices in different positions, it is designed with an open structure on both sides. In actual use, only one side is connected to the electronic device through the second connecting piece 262, while the other side is easily exposed, causing sand particles to adhere to the surface of the first connecting piece 261 of the stationary contact 260.

[0058] In this embodiment, when the contact box assembly 200 is working, the moving contact group rotates based on the first boss 211, driving the first moving contact 230 and the second moving contact 240, which are arranged opposite to each other, to move synchronously, so that the two can contact or disengage with the first connecting piece 261 of the stationary contact group, thereby completing the conduction or disconnection control of the stationary contact 260. During the process of the auxiliary switch 100 repeatedly switching working states, the repeated rotation of the moving contact group will cause the first moving contact 230, the second moving contact 240 and the first connecting piece 261 to form a continuous "contact-disengagement" cycle. The relative movement when the two are in contact can repeatedly scrape the surface of the first connecting piece 261 to remove the oxide film and foreign matter on the surface of the first connecting piece 261.

[0059] The core function of this design is to actively remove the oxide film and foreign matter attached to the surface of the first connecting piece 261 through the dynamic scraping action of the moving contact piece and the stationary contact piece 260. This avoids the accumulation of oxide film or foreign matter on the stationary contact piece 260 due to invading sand and dust, which could lead to poor contact. It solves the problem of sand and dust intrusion caused by the exposed contact slot 220 without the need for additional complex sealing and shielding structures. This ensures the flexibility of the contact slot 220 to adapt to external connections in different positions, and achieves self-cleaning function through the movement of the structure itself. It significantly improves the conductivity reliability of the contact box assembly 200 in sandy environments, extends the service life of the stationary contact piece 260 and the moving contact piece, and ensures the accurate and stable switching action of the auxiliary switch 100.

[0060] Further, please see Figure 6 The first movable contact 230 includes a contact body 231 and a snap-fit ​​hole 232 disposed on the contact body 231. The two ends of the contact body 231 are respectively provided with a first contact 233 and a second contact 234.

[0061] The first contact 233 and the second contact 234 of the first movable contact 230 and the second movable contact 240 are arranged opposite to each other and in contact, and both ends are open to facilitate the stationary contact 260 to contact or detach from the first contact 233 and the second contact 234 of the first movable contact 230 and the second movable contact 240.

[0062] When the stationary contact 260 contacts the first contact 233 and the second contact 234 of the first movable contact 230 and the second movable contact 240, the stationary contact 260 is engaged with the first contact 233 and the second contact 234 of the first movable contact 230 and the second movable contact 240.

[0063] Specifically, the snap-fit ​​hole 232 enables the quick assembly and fixation of the first moving contact 230 with the driving component, ensuring that the moving contact will not shift position during rotation with the driving component. The opposing openings of the first contact 233 and the second contact 234 provide a basis for the installation and positioning of the moving contact assembly. When the moving contact assembly rotates, the stationary contact 260 can smoothly slide into or out of the contact area between the first contact 233 and the second contact 234 of the two moving contacts, avoiding jamming caused by structural interference.

[0064] When the stationary contact 260 contacts the first contact 233 and the second contact 234 of the two moving contacts, the three form a stable three-point contact structure. The snap-fit ​​design further enhances the tightness of the contact and reduces the contact resistance. At the same time, during the scraping and cleaning process, this snap-fit ​​cooperation makes the force exerted by the contacts on the surface of the stationary contact 260 more uniform, improves the cleaning effect, and ensures the stability of the conductivity.

[0065] Furthermore, a first limiting piece 235 and a second limiting piece 236 are respectively provided on both sides of the contact body 231; the first limiting piece 235 and the second limiting piece 236 are used to restrict the position of the stationary or moving contact group on the first boss 211.

[0066] Specifically, the first limiting piece 235 and the second limiting piece 236 are symmetrically distributed on the edge of the contact body 231, and their height is slightly higher than the surface of the stationary contact piece 260.

[0067] Specifically, when the moving contact assembly moves toward the stationary contact 260, the inner walls of the first limiting piece 235 and the second limiting piece 236 will first contact the two side edges of the moving contact assembly. The reaction force generated by the contact will limit the lateral displacement of the moving contact assembly, ensuring that the first contact 233 and the second contact 234 of the moving contact assembly can be accurately aligned with the contact area of ​​the stationary contact 260.

[0068] In addition, the cooperation between the first limiting piece 235 and the second limiting piece 236 and the first boss 211 can strictly limit the movement range of the moving contact piece group to the surface of the boss, prevent the moving contact piece group from accidentally rubbing or colliding with other non-contact areas of the contact piece body 231, reduce unnecessary wear, and extend the service life of the overall structure.

[0069] Further, please see Figure 6The contact body 231 is further provided with a plurality of sliding protrusions 251. The first movable contact 230 and / or the second movable contact 240 contact the first boss 211 through the sliding protrusions 251, so that the first movable contact 230 and / or the second movable contact 240 slide against the first boss 211. The sliding protrusions 251 are arc-shaped.

[0070] Specifically, in this embodiment, the contact design between the sliding protrusion 251 and the first protrusion 211 can transform the surface contact between the moving contact assembly and the protrusion into point contact or line contact, effectively reducing the friction area between the two, thereby reducing the resistance of the moving contact assembly during the sliding process and improving the flexibility and smoothness of the movement.

[0071] Meanwhile, the sliding protrusions 251 ensure that the moving contact assembly maintains a stable trajectory during sliding, preventing jamming or offset caused by uneven contact surfaces and ensuring the movement accuracy of the moving contact assembly. Furthermore, the distribution of several sliding protrusions 251 evenly disperses the contact pressure, preventing excessive local pressure from causing deformation of the boss surface or the moving contact assembly, further guaranteeing the stability and service life of the structure.

[0072] Further, please see Figure 4 The contact box 210 is provided with a first connecting protrusion 225 and a second connecting protrusion 226 on both sides respectively; the bottom of the first connecting protrusion 225 and the second connecting protrusion 226 is provided with a first connecting groove 227 and a second connecting groove 228 respectively; the two contact boxes 210 can be assembled and connected to each other through the first connecting protrusion 225 and the first connecting groove 227, the second connecting protrusion 226 and the second connecting groove 228.

[0073] Specifically, since the entire switchgear may require multiple contact box assemblies 200 to work together during operation, this specific structure is needed to complete the installation and assembly operations.

[0074] In actual assembly, if it is necessary to combine multiple contact boxes 210, specifically, the first connecting protrusion 225 on one contact box 210 is precisely aligned with and embedded into the first connecting groove 227 of the adjacent contact box 210. At the same time, the second connecting protrusion 226 on this contact box 210 is also inserted into the second connecting groove 228 of the adjacent contact box 210. In this way, the two contact boxes 210 can be quickly and accurately positioned and stably connected.

[0075] This modular design offers numerous advantages. First, it significantly simplifies the assembly process by combining multiple contact boxes 210, thereby greatly improving assembly efficiency. Furthermore, the overall structure assembled in this way possesses high connection strength and stability, effectively preventing loosening or displacement of the contact boxes 210 due to vibration or external forces during use.

[0076] In addition, the connection protrusions and connection slots adopt a uniform design, a clever concept that greatly enhances the interchangeability between different contact boxes 210. This means that the number of contact boxes 210 can be flexibly increased or decreased according to the actual capacity requirements of the switching equipment, thereby significantly improving the product's versatility and applicability.

[0077] Further, please see Figure 4 The contact slot 220 is provided with a first connection port 221 communicating with the empty slot 213, and a second connection port 223 and a third connection port 224 communicating with the first connection port 221;

[0078] The first connection port 221 is provided with a dustproof groove 222, the contact box 210 is provided with a dustproof protrusion at the bottom corresponding to the dustproof groove 222, and the stationary contact piece 260 is also provided with a groove at the position corresponding to the dustproof groove 222;

[0079] When the two contact boxes 210 are connected, the dustproof grooves 222 of the two contact boxes 210 are connected to the dustproof protrusions to prevent wind and sand from entering the interior of the contact box 210 through the second connection port 223 and the third connection port 224.

[0080] Although it was mentioned earlier that sand particles on the first connecting piece 261 can be removed by scraping, excessive scraping or force can cause wear and tear on the first connecting piece 261, thus reducing its service life. The structural design described here uses a combination of a dustproof groove 222 and a dustproof protrusion to seal the first connecting opening 221, thereby preventing sand from entering at the source and achieving dust prevention.

[0081] During actual assembly, when multiple contact boxes 210 need to be combined, the operator only needs to accurately insert the first connecting protrusion 225 of an adjacent contact box 210 into the first connecting groove 227 of another contact box 210. At the same time, the second connecting protrusion 226 must be inserted into the corresponding second connecting groove 228. This allows for easy and rapid positioning and initial fixation. This modular connection method has many advantages. It not only simplifies the installation process and reduces assembly time, but also ensures that multiple contact boxes 210 form a stable overall structure after assembly, preventing displacement due to vibration or external forces during use.

[0082] In this process, the structure of the dustproof groove 222 and the dustproof protrusion, which cooperate with each other, forms a tight fit when the contact box 210 is assembled. This tight fit effectively prevents various impurities such as wind, sand, and dust from entering the contact groove 220 and the empty groove 213 through the connection port. This prevents these impurities from adhering to the surface of the stationary contact 260 or the moving contact, thus affecting their conductivity. It also avoids poor contact caused by impurity accumulation. Therefore, this design not only plays an important role in ensuring the stability of circuit connections but also further improves the overall dustproof sealing effect of the contact box 210, thereby extending the service life of the internal components.

[0083] Further, please see Figure 3 A sealing piece 263 is provided on one side of the second connecting piece 262. The sealing piece 263 is used to seal the second connecting port 223 or the third connecting port 224 to prevent wind and sand from entering the contact box 210 through the second connecting port 223 or the third connecting port 224.

[0084] Specifically, while scraping can effectively remove sand particles adhering to the surface of the first connecting piece 261 during the initial operation, ensuring its normal function, it's important to note that excessive scraping or force can cause wear to the surface material of the first connecting piece 261, thus reducing its overall lifespan. Therefore, to fundamentally solve this problem, the designers optimized the structure by directly sealing the unused second connecting port 223 or third connecting port 224 with the sealing piece 263, thereby preventing sand particles from entering the contact box 210 at the source.

[0085] Example 2

[0086] Please see Figure 1 and Figure 2A wind- and sand-resistant auxiliary switch is provided. The auxiliary switch 100 includes a first cover plate 110 and a second cover plate 120, and the contact box assembly 200 is disposed between the first cover plate 110 and the second cover plate 120.

[0087] The auxiliary switch 100 also includes a drive shaft 130, which is disposed from the first cover plate 110 into the contact box assembly 200 and engages with the snap-fit ​​hole 232 of the moving contact piece group to drive the moving contact piece group to rotate within the contact box 210.

[0088] Please see Figure 7 The bottom of the first cover plate 110 is provided with a sealing block 111 for sealing the first connection port 221.

[0089] Specifically, by pre-installing the sealing block 111 at the bottom of the first cover plate 110 corresponding to the contact groove 220 where the stationary contact piece 260 is not located, when the first cover plate 110 and the second cover plate 120 are assembled to form an integral structure, the sealing block 111 can be precisely embedded in the contact groove 220, achieving physical isolation through its tight fit with the inner wall of the contact groove 220. This method of use requires no additional fixing steps; the sealing effect is guaranteed by the assembly pressure of the cover plate itself. This simplifies the installation process and effectively prevents component wear or poor contact caused by wind and sand intruding into the switch through the empty contact groove 220. At the same time, the setting of the sealing block 111 means that during the adaptation of the auxiliary switch 100 to different specifications of contact groups, there is no need to redesign the cover plate structure. Only the installation position of the sealing block 111 needs to be adjusted according to the usage of the contact groove 220, which greatly improves the versatility of the product and production efficiency, and further enhances the overall protective performance of the auxiliary switch 100 in windy and sandy environments.

[0090] Furthermore, the contact box 210, which is disposed adjacent to the first cover plate 110 and the second cover plate 120, is provided with a sealing structure at the connection between it and the drive shaft 130;

[0091] The sealing structure includes a bushing 310, on which a sealing groove 311 is provided, and a sealing ring 312 is provided in the sealing groove 311 to prevent wind and sand from entering the interior from both ends of the auxiliary switch 100.

[0092] Specifically, a bushing 310 is installed at the connection between the contact box 210 and the drive shaft 130. A sealing ring 312 is installed using the sealing groove 311 on the bushing 310, ensuring that the sealing ring 312 is in close contact with the outer wall of the drive shaft 130 and the inner wall of the contact box 210, forming multiple annular sealing barriers. This structural design can specifically seal the dynamic gaps at both ends of the auxiliary switch 100 caused by the rotation of the drive shaft 130, preventing wind and sand from entering the interior through the shaft hole. Compared to traditional single sealing methods, this sealing structure, with the positioning and support of the bushing 310 for the sealing ring 312, can effectively prevent the sealing ring 312 from shifting or aging due to shaft rotation friction during long-term use, ensuring the durability and stability of the sealing performance. Meanwhile, the sealing groove 311 provides a precise installation space for the sealing ring 312, ensuring consistency during assembly, reducing the risk of poor sealing due to human installation errors, and further improving the overall sealing protection level of the auxiliary switch 100 in the windy and sandy environment. It works synergistically with the contact groove 220 of the sealing block 111 to build a comprehensive wind and sand protection system from multiple key parts.

[0093] Furthermore, a plurality of contact box assemblies 200 are provided between the first cover plate 110 and the second cover plate 120, which are assembled and connected by the first connecting protrusion 225 to the first connecting groove 227, the second connecting protrusion 226 and the second connecting groove 228, so as to realize the conduction of multiple electronic devices.

[0094] In this embodiment, the embedded engagement of the first connecting protrusion 225 with the first connecting groove 227 and the precise docking of the second connecting protrusion 226 with the second connecting groove 228 ensures the accurate positioning of adjacent contact box assemblies 200 during assembly, avoiding poor circuit contact caused by misalignment. This modular assembly design not only simplifies the installation process of multiple components and reduces assembly difficulty, but also allows for flexible adjustment of the number of contact box assemblies 200 according to the actual connection requirements of electronic devices, improving the scalability and applicability of the overall structure.

[0095] Meanwhile, the tight engagement between the connecting protrusion and the connecting groove can enhance the connection strength between components, prevent the connection from loosening due to vibration and other factors during equipment operation, and ensure the stability and reliability of circuit conduction.

[0096] 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 contact box assembly (200) for a windblown sand type auxiliary switch, characterized in that, include: The contact box (210) includes a first boss (211) and a second boss (212), and a slot (213) disposed between the first boss (211) and the second boss (212); the four corners of the contact box (210) are also provided with contact slots (220). The movable contact assembly includes a first movable contact (230) and a second movable contact (240) with identical structures and arranged in opposite directions. The movable contact assembly is disposed on the first boss (211) and can rotate based on the first boss (211). The stationary contact assembly includes at least one pair of stationary contact pieces (260) disposed in the contact piece groove (220). The stationary contact piece (260) includes a first connecting piece (261) and a second connecting piece (262). The first connecting piece (261) is used to connect with the moving contact assembly, and the second connecting piece (262) is used to connect with an external electronic device. The moving contact group can turn on or off at least one pair of stationary contacts (260) by rotating based on the first boss (211).

2. The anti-sand contact box assembly (200) for auxiliary switch according to claim 1, characterized in that, The first movable contact (230) includes a contact body (231) and a snap-fit ​​hole (232) disposed on the contact body (231). The two ends of the contact body (231) are respectively provided with a first contact (233) and a second contact (234). The first contact (233) and the second contact (234) of the first movable contact (230) and the second movable contact (240) are arranged opposite to each other and in contact, and both ends are open, so that the stationary contact (260) can contact or detach from the first contact (233) and the second contact (234) of the first movable contact (230) and the second movable contact (240); When the stationary contact piece (260) contacts the first contact (233) and the second contact (234) of the first movable contact piece (230) and the second movable contact piece (240), the stationary contact piece (260) is engaged with the first contact (233) and the second contact (234) of the first movable contact piece (230) and the second movable contact piece (240).

3. The anti-sand contact box assembly (200) for auxiliary switch of claim 2, wherein, The two sides of the contact body (231) are respectively provided with a first limiting piece (235) and a second limiting piece (236). The first limiting piece (235) and the second limiting piece (236) are used to restrict the position of the stationary or moving contact piece group on the first boss (211).

4. The contact box assembly (200) for a wind-resistant auxiliary switch according to claim 2, characterized in that, The contact body (231) is also provided with a plurality of sliding protrusions (251). The first movable contact (230) and / or the second movable contact (240) contact the first boss (211) through the sliding protrusions (251) so that the first movable contact (230) and / or the second movable contact (240) slide with the first boss (211).

5. The contact box assembly (200) for a wind-resistant auxiliary switch according to claim 1, characterized in that, The contact box (210) is provided with a first connecting protrusion (225) and a second connecting protrusion (226) on both sides respectively. The bottom of the first connecting protrusion (225) and the second connecting protrusion (226) are respectively provided with a first connecting groove (227) and a second connecting groove (228); The two contact boxes (210) can be assembled and connected to each other through the first connecting protrusion (225) of the two contact boxes (210) with the first connecting groove (227), the second connecting protrusion (226) and the second connecting groove (228).

6. The contact box assembly (200) for a wind-resistant auxiliary switch according to claim 5, characterized in that, The contact slot (220) is provided with a first connection port (221) communicating with the empty slot (213), and a second connection port (223) and a third connection port (224) communicating with the first connection port (221). The first connection port (221) is provided with a dustproof groove (222), and the contact box (210) is provided with a dustproof protrusion at the bottom corresponding to the dustproof groove (222); the stationary contact piece (260) is also provided with a groove at the position corresponding to the dustproof groove (222); When the two contact boxes (210) are connected, they are connected to the dustproof protrusion through the dustproof groove (222) of the two contact boxes (210) to prevent wind and sand from entering the interior of the contact box (210) through the second connection port (223) and the third connection port (224).

7. The contact box assembly (200) for a wind-resistant auxiliary switch according to claim 6, characterized in that, A sealing piece (263) is provided on one side of the second connecting piece (262). The sealing piece (263) is used to seal the second connecting port (223) or the third connecting port (224) to prevent wind and sand from entering the contact box (210) through the second connecting port (223) or the third connecting port (224).

8. A sand-resistant auxiliary switch (100), comprising a contact box assembly (200) for a sand-resistant auxiliary switch as described in any one of claims 6-7; characterized in that... ； The auxiliary switch (100) includes a first cover plate (110) and a second cover plate (120), and the contact box assembly (200) is disposed between the first cover plate (110) and the second cover plate (120); The auxiliary switch (100) also includes a drive shaft (130), which is disposed inside the contact box assembly (200) by the first cover plate (110) and engages with the snap-fit ​​hole (232) of the moving contact piece group to drive the moving contact piece group to rotate inside the contact box (210); The bottom of the first cover plate (110) is provided with a sealing block (111) for closing the first connection port (221).

9. The wind-resistant auxiliary switch (100) according to claim 8, characterized in that, The contact box (210) arranged adjacent to the first cover plate (110) and the second cover plate (120) is provided with a sealing structure at the connection between it and the drive shaft (130); The sealing structure includes a bushing (310), on which a sealing groove (311) is provided, and a sealing ring (312) is provided in the sealing groove (311) to prevent wind and sand from entering the interior from both ends of the auxiliary switch (100).

10. The wind-resistant auxiliary switch (100) according to claim 8, characterized in that, A plurality of contact box assemblies (200) are provided between the first cover plate (110) and the second cover plate (120) and are assembled and connected by the first connecting protrusion (225) to the first connecting groove (227), the second connecting protrusion (226) and the second connecting groove (228).

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