Contact falling prevention structure of switch equipment and switch equipment

Abstract

The contact falling prevention structure of the switch equipment comprises an electromagnetic unit, a transmission rod and a conductive unit, the conductive unit comprises a moving contact and a static contact which are matched with each other, the electromagnetic unit drives the moving contact and the static contact to be opened and closed through the transmission rod, the contact falling prevention structure further comprises a falling prevention unit corresponding to the transmission rod, and the falling prevention unit comprises at least two limiting pieces. A limiting gap for limiting the transmission rod is formed between the at least two limiting pieces, the limiting gap comprises a closing gap, a demarcation gap and an opening gap which are arranged in sequence, and the size of the demarcation gap is smaller than the outer diameter of the transmission rod; when the switch equipment is switched on, the transmission rod is limited in the switching-on gap; and when the switch equipment is tripped / opened, the transmission rod is limited in the opening gap after expanding the demarcation gap. The switch equipment comprises the contact falling prevention structure of the switch equipment. According to the contact falling prevention structure of the switch equipment and the switch equipment, the moving contact is prevented from falling, reclosing is avoided, and the effect of preventing the moving contact and the static contact from being separated during closing can be achieved.

Description

Technical Field

[0001] The utility model relates to the field of low-voltage electrical appliances, in particular to a contact-drop prevention structure of a switch device and the switch device. Background Art

[0002] There are two types of existing switchgear. One is a vacuum type, in which the moving and static contacts are located in an inert gas atmosphere, which can effectively avoid the generation of arcs. The other is an air type, in which the moving and static contacts are located in an air environment, and an arc extinguishing chamber is provided in the contactor to extinguish the arc generated by the moving and static contacts during the opening and closing process.

[0003] When the moving and static contacts of the switching device are closed, electric repulsion will be generated under high current conditions, causing the contacts to easily bounce open. This problem is generally solved by overtravel movement of the moving contact in conjunction with a compression spring. In addition, when the moving and static contacts are disconnected, during the process of the compression spring recovering its deformation, the kinetic energy of the contact bridge of the moving contact is relatively large. On the one hand, it is easy to impact the housing, causing damage to the housing / contact frame and reducing the life of the switching device. On the other hand, after the impact, the contact bridge rebounds, which can easily cause the moving and static contacts to re-close, threatening the safety of the line. Summary of the invention

[0004] The utility model aims to overcome at least one defect of the prior art and provide a contact-drop prevention structure of a switch device and a switch device.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The contact drop prevention structure of a switch device comprises an electromagnetic unit, a transmission rod and a conductive unit, wherein the conductive unit comprises a matching moving contact and a static contact, wherein the electromagnetic unit drives the moving contact and the static contact to open and close via the transmission rod to realize the opening and closing of the switch device, and further comprises an anti-drop unit arranged corresponding to the transmission rod, wherein the anti-drop unit comprises at least two limiting members, wherein a limiting gap for limiting the transmission rod is provided between at least two limiting members, wherein the limiting gap comprises a closing gap, a boundary gap and an opening gap which are arranged in sequence, and wherein the size of the boundary gap is smaller than the outer diameter of the transmission rod; when the switch device is closed, the transmission rod is limited within the closing gap; when the switch device is tripped / opened, the transmission rod is limited within the opening gap after expanding the boundary gap.

[0007] Optionally, the limiting gap includes two first inclined planes arranged opposite to each other and two second inclined planes arranged opposite to each other, the closing gap is formed between the two first inclined planes, the opening gap is formed between the two second inclined planes, the two first inclined planes and the two second inclined planes are arranged in sequence along the opening direction, the boundary gap is formed between the connection between the two first inclined planes and the two second inclined planes, the opening direction is the moving direction of the transmission rod when the switching device is opened, the size of the closing gap gradually decreases along the opening direction, and the size of the opening gap gradually increases.

[0008] Optionally, the anti-drop unit includes two limiting members forming a limiting gap, the two limiting members are symmetrically arranged, and a first inclined surface and a second inclined surface are provided on the inner side of the limiting members.

[0009] Optionally, the limiting member is a block structure made of flexible material.

[0010] Optionally, an anti-slip coating is coated on the surface of the limiting member.

[0011] Optionally, the anti-drop unit also includes an anti-drop unit shell, the limiting member is installed in the anti-drop unit shell, and sliding holes that slide with the transmission rod are provided on both sides of the anti-drop unit shell. The anti-drop unit shell is sleeved on the transmission rod through the sliding holes, and the transmission rod slides along the sliding holes when the switch device is closed or tripped / opened.

[0012] Optionally, the anti-drop unit further includes an elastic member, and the two limiting members forming the limiting gap approach each other under the elastic force of the elastic member.

[0013] Optionally, each of the two limiting members is provided with an elastic member, the elastic member is a spring, one end of the elastic member is connected to the outer side of the limiting member, and the elastic force direction of the elastic member is perpendicular to the moving direction of the transmission rod and perpendicular to the axial direction of the transmission rod.

[0014] Optionally, the anti-drop unit further includes at least one micro switch, and the transmission rod cooperates with the micro switch trigger. During the closing and tripping / opening conversion process of the switching device, the transmission rod moves to cause the micro switch to switch between a triggered state and an untriggered state.

[0015] Optionally, the switch device is a vehicle switch device, the electromagnetic unit drives the moving contact and the static contact to open and close through a transmission rod, the moving contact and the static contact of the conductive unit are installed in a conductive unit housing, the electromagnetic unit includes a coil, a static iron core, and a moving iron core, the transmission rod is linked to the moving iron core, and is inserted into the conductive unit housing to connect with the moving contact, and when the moving iron core moves under the action of the electromagnetic force of the coil, the moving contact is driven by the transmission rod to move and cooperate with the static contact.

[0016] Optionally, the moving iron cores of the conductive unit and the electromagnetic unit are located on the left and right sides of the anti-drop unit, and the anti-drop unit is located below the coil of the electromagnetic unit. The two limiting members of the anti-drop unit that form a limiting gap are located on the front and rear sides of the transmission rod.

[0017] Optionally, the conductive unit has a moving contact and two symmetrical stationary contacts, the bottom surfaces of the two stationary contacts have a stationary contact point, the moving contact is a bridge-shaped structure, and a moving contact point is provided on the top surfaces of both ends for correspondingly cooperating with the stationary contacts of the two stationary contacts.

[0018] A switch device, comprising a contact-drop prevention structure of the switch device of any one of the above technical solutions.

[0019] The contact-drop prevention structure and the switch device of the utility model are provided with a closing gap corresponding to the closing state and an opening gap corresponding to the tripping / opening state through two limiting parts, which are used to limit the moving position of the transmission rod, and a boundary gap which the transmission rod cannot cross in the absence of external force is provided in the middle position, so as to achieve buffering, braking and limiting effects on the transmission rod during tripping / opening, thereby preventing the moving contact from falling and avoiding reclosing, and also achieving a limiting effect on the transmission rod during closing, thereby achieving the effect of preventing the moving contact and the static contact from being repelled from each other.

[0020] In addition, the limiting gap is formed by arranging two continuous inclined surfaces on opposite sides of the two limiting members, so the limiting effect is stable and reliable, the structure is simple, and the manufacturing is easy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional diagram of the contact-drop prevention structure of the switch device of the utility model;

[0022] Figure 2 This is a front view of the contact drop prevention structure of the switch device of the utility model;

[0023] Figure 3 It is a structural schematic diagram of the conductive unit of the utility model;

[0024] Figure 4 It is a structural schematic diagram of the anti-drop unit and the transmission rod of the utility model;

[0025] Figure 5 It is a structural schematic diagram of the transmission rod, the limiting member and the elastic member when the utility model is closed;

[0026] Figure 6 It is a schematic diagram of the structure of the transmission rod, the limiter and the elastic member during the state conversion process of the utility model;

[0027] Figure 7 It is a schematic diagram of the structure of the transmission rod, the limiter and the elastic member when the utility model is tripped / opened;

[0028] Figure 8 It is a schematic diagram of the principle of forming a limiting gap by two limiting members of the utility model;

[0029] Fig. 9 It is a structural schematic diagram of the transmission rod and the micro switch when the utility model is closed;

[0030] Fig.10 It is a schematic diagram of the structure of the transmission rod and the micro switch when the utility model is tripped / opened;

[0031] Anti-drop unit 100; anti-drop unit housing 110; sliding hole 111; limit member 120; first inclined surface 121; second inclined surface 122; closing gap 131; boundary gap 132; opening gap 133; mounting member 140; elastic member 150; micro switch 160; trigger rod 161; trigger point 162; conductive unit 200; conductive unit housing 210; exhaust structure 211; arc extinguishing chamber 220; static contact 230; static contact point 231; moving contact 240; moving contact 241; electromagnetic unit 300; coil 310; static iron core 320; moving iron core 330; transmission rod 400. DETAILED DESCRIPTION

[0032] The following embodiments are combined with the accompanying drawings to further illustrate the contact drop prevention structure of the switch device and the specific implementation of the switch device of the present invention. The contact drop prevention structure of the switch device and the switch device of the present invention are not limited to the description of the following embodiments.

[0033] like Figure 1-8As shown, the switch device of this embodiment includes a contact-drop prevention structure of the switch device. The contact-drop prevention structure of the switch device of this embodiment includes an electromagnetic unit 300, a transmission rod 400 and a conductive unit 200, wherein the conductive unit 200 includes a matching moving contact 240 and a static contact 230, and the electromagnetic unit 300 drives the moving contact 240 and the static contact 230 to open and close through the transmission rod 400 to realize the opening and closing of the switch device. In particular, the contact-drop prevention structure of the switch device also includes an anti-drop unit 100 arranged corresponding to the transmission rod 400, and the anti-drop unit 100 includes at least two limiting members 120, and there is a limiting gap between the at least two limiting members 120 for limiting the transmission rod 400, and the limiting gap includes a closing gap 131, a boundary gap 132 and an opening gap 133 arranged in sequence, and the size of the boundary gap 132 is smaller than the outer diameter of the transmission rod 400. When the switch device is closed, the transmission rod 400 is limited in the closing gap 131; when the switch device is tripped / opened, the transmission rod 400 expands the boundary gap 132 and is limited in the opening gap 133. The contact drop prevention structure and switch device of the switch device of this embodiment are provided with a closing gap 131 corresponding to the closing state and an opening gap 133 corresponding to the tripping / opening state through two limiting members 120, which are used to limit the moving position of the transmission rod 400, and a boundary gap 132 that the transmission rod 400 cannot cross in the absence of external force is provided in the middle position, so as to achieve a buffering braking and limiting effect on the transmission rod 400 during tripping / opening, thereby preventing the moving contact 240 from falling and avoiding reclosing, and also can play a limiting role on the transmission rod 400 during closing, so as to achieve the effect of preventing the moving contact 240 from being repelled from the static contact 230. The switch device of this embodiment may be a contactor, a circuit breaker, a contactor-type circuit breaker, etc., and may have an automatic tripping function in case of a fault or may not have an automatic tripping function.

[0034] like Figure 8 As shown, the limiting gap includes two first inclined surfaces 121 and two second inclined surfaces 122 that are arranged opposite to each other. The closing gap 131 is formed between the two first inclined surfaces 121, and the opening gap 133 is formed between the two second inclined surfaces 122. The closing gap 131 and the opening gap 133 are arranged along the opening direction, that is, the two first inclined surfaces 121 and the two second inclined surfaces 122 are arranged in sequence along the opening direction, and the boundary gap 132 is formed between the connection between the two first inclined surfaces 121 and the two second inclined surfaces 122. The opening direction is the moving direction of the transmission rod 400 when the switch device is opened. Along the opening direction, the size of the closing gap 131 gradually decreases, and the size of the opening gap 133 gradually increases.

[0035] The anti-drop unit 100 of this embodiment includes two stoppers 120, which are symmetrically arranged. The inner sides of the stoppers 120 are provided with a first inclined surface 121 and a second inclined surface 122. The closing gap 131 is formed between the first inclined surfaces 121 of the two stoppers 120, the opening gap 133 is formed between the second inclined surfaces 122 of the two stoppers 120, and the boundary gap 132 is formed between the connection between the first inclined surfaces 121 and the second inclined surfaces 122 of the two stoppers 120. Figure 5-7 As shown, when the switch device is opened, the moving direction of the transmission rod 400 is the opening direction (i.e., the up and down direction in the figure), and the size of the closing gap 131 gradually decreases along the opening direction, and the size of the opening gap 133 gradually increases. The two limiting members 120 are provided with two continuous inclined surfaces on opposite sides to form a limiting gap, so the limiting effect is stable and reliable, the structure is simple, and it is easy to manufacture.

[0036] As another embodiment, the anti-fall unit 100 may also include four limiting members 120, and the four limiting members 120 form a limiting gap. For example, two limiting members 120 are arranged opposite to each other and are provided with a first inclined surface 121 to form the closing gap 131, and the other two limiting members 120 are arranged opposite to each other and are provided with a second inclined surface 122 to form the opening gap 133; the closing gap 131 and the opening gap 133 are arranged opposite to each other up and down, and the limiting gap is formed between the closing gap 131 and the opening gap 133, and the first inclined surface 121 and the second inclined surface 122 are arranged opposite to each other. Figure 8 The embodiment is similar.

[0037] In order to realize that the boundary gap 132 between the two limit members 120 can be enlarged, the limit member 120 of this embodiment is a block structure made of flexible material. The flexible material can be rubber, plastic, resin; of course, it can also be other materials. When the switch device trips / opens, since the limit member 120 is flexible, the rigid transmission rod 400 can squeeze the two limit members 120 during the movement, thereby enlarging the boundary gap 132, and finally limiting it in the opening gap 133. In addition, in order to further improve the anti-fall and anti-repulsion effects, the surfaces of the two limit members 120 are coated with an anti-slip coating. The anti-slip coating of this embodiment can be an epoxy anti-slip coating, a polyurethane anti-slip coating, an alkyd anti-slip coating, a chlorinated rubber anti-slip coating, etc.

[0038] like Figure 4As shown, the anti-drop unit 100 of this embodiment further includes an anti-drop unit housing 110, the stopper 120 is installed in the anti-drop unit housing 110, and the two sides of the anti-drop unit housing 110 are provided with sliding holes 111 that are slidably matched with the transmission rod 400. The anti-drop unit housing 110 is sleeved on the transmission rod 400 through the sliding holes 111, and the transmission rod 400 slides along the sliding holes 111 when the switch device is closed or tripped / opened. The stopper 120 of this embodiment can be directly installed on the wall of the anti-drop unit housing 110 or installed in the anti-drop unit housing 110 through the mounting member 140 for mounting the stopper 120. Of course, as other embodiments, the anti-drop unit housing 110 may not be provided, and the stopper 120 may be provided on the housing of the switch device.

[0039] like Figure 5-7 As shown, the anti-drop unit 100 of this embodiment also includes an elastic member 150, and under the elastic force of the elastic member 150, two limit members 120 are formed to be close to each other. Specifically, each of the two limit members 120 is provided with an elastic member 150, and the elastic member 150 is a spring, one end of the elastic member 150 is connected to the outer side of the limit member 120, and the other end is connected to the anti-drop unit housing 110, and the elastic force direction of the elastic member 150 is perpendicular to the moving direction of the transmission rod 400 and perpendicular to the axial direction of the transmission rod 400. In this embodiment, when the transmission rod 400 is in the opening gap 133 and the closing gap 131, the elastic member 150 is in a deformed state and applies a reaction force to the limit member 120, so that the limit member 120 contacts / reacts with the transmission rod 400. When the limiter 120 is in the opening gap 133, the transmission rod 400 contacts / contacts the limiter 120 under the action of the elastic member 150, which can prevent the moving contact 240 from falling; when the limiter 120 is in the closing gap 131, the transmission rod 400 contacts / contacts the limiter 120 under the action of the elastic member 150, which can prevent the moving contact 240 from being repelled. Of course, as other embodiments, the elastic member 150 can also be always in a deformed state (for example, a compression spring that is always compressed), so that the limiter 120 is always in contact / contact with the transmission rod 400 when it is in the opening gap 133, the closing gap 131 and the boundary gap 132. In addition, as other embodiments, the elastic member 150 can also be omitted, and the limiter 120 itself has elasticity and can clamp and limit the transmission rod 400 by relying on its own elasticity. For example, the limiter 120 is made of a material that can at least be slightly deformed, such as plastic, rubber, resin, etc.

[0040] like Figure 9-10As shown, the anti-fall unit 100 of this embodiment further includes at least one micro switch 160, and the transmission rod 400 cooperates with the micro switch 160 in triggering. During the switching process of the switch device closing and tripping / opening, the transmission rod 400 moves so that the micro switch 160 switches between the triggered state and the untriggered state. The micro switch 160 of this embodiment is a standard part, having a trigger rod 161. The mounting end of one end of the trigger rod 161 is mounted on the micro switch housing, and a trigger gap is left between the trigger end of the other end and the trigger point 162 on the housing, as shown in FIG. Figure 9-10 When the switch is closed, the transmission rod 400 moves upward, driving the trigger end of the trigger rod 161 of the micro switch 160 to swing toward the trigger point 162 to trigger the micro switch 160. When the switch is opened, the transmission rod 400 moves downward to drive the trigger end of the trigger rod 161 of the micro switch 160 to swing away from the trigger point 162 to untrigger the micro switch 160. In this embodiment, after the on-off state of the micro switch 160 is associated with the position information of the transmission rod 400 (i.e., the on-off information of the switch device), the corresponding alarm, auxiliary, status display and other functions can be realized. The implementation method of the micro switch 160 function in this embodiment can be realized by the prior art. For example, a controller can be provided to process two different signals issued in the two states of the micro switch 160 being triggered and not triggered and send a control signal, for example, the control signal is transmitted to the indicator light to distinguish between on and off through two different colors, and the control signal converted from the untriggered signal of the micro switch 160 can also be transmitted to an alarm such as an alarm indicator light or a buzzer to achieve an alarm effect.

[0041] like Figure 1-2As shown, the switch device of this embodiment is a vehicle switch device, and its structure is similar to the combination of a contactor and a circuit breaker. The electromagnetic unit 300 drives the moving contact 240 and the static contact 230 to open and close through the transmission rod 400. The moving contact 240 and the static contact 230 of the conductive unit 200 are installed in the conductive unit housing 210. The conductive unit housing 210 is also provided with an arc extinguishing chamber 220. The electromagnetic unit 300 includes a coil 310, a static iron core 320, and a moving iron core 330. The transmission rod 400 is linked to the moving iron core 330 and penetrates into the conductive unit housing 210 to be connected with the moving contact 240. When the moving iron core 330 moves under the electromagnetic force of the coil 310, the moving contact 240 is driven by the transmission rod 400 to move and cooperate with the static contact 230. The moving iron core 330 of the conductive unit 200 and the electromagnetic unit 300 is located on the left and right sides of the anti-drop unit 100, and the anti-drop unit 100 is located below the coil 310 of the electromagnetic unit 300, and the two limiters 120 of the anti-drop unit 100 are located on the front and rear sides of the transmission rod 400. The layout is compact and reasonable, saving space, and the gap between the conductive unit 200 and the electromagnetic unit 300 left in the original structure is used as the installation space of the newly added anti-drop unit 100. The conductive unit 200 of this embodiment serves as a phase pole of the switch device, which can be set to several, and a single electromagnetic unit 300 drives several conductive units 200 at the same time through the transmission rod 400; the conductive unit 200 of this embodiment is preferably set to two, and the two conductive units 200 are symmetrically arranged on the left and right sides of the electromagnetic unit 300, and the two ends of the transmission rod 400 are respectively connected to the two conductive units 200. The conductive unit 200 of this embodiment is provided with a conductive unit housing 210 so that the moving contact 240 , the stationary contact 230 , and the arc extinguishing chamber 220 can be assembled into a conductive component, and multiple conductive components can be arranged to be assembled into a module, and the accessory unit 100 can be integrated into the conductive unit housing 210 .

[0042] like Figure 3As shown, the conductive unit 200 of this embodiment has a moving contact 240 and two symmetrical stationary contacts 230, and accordingly, the switch device has two accessory units 100 corresponding to the two stationary contacts 230. The bottom surface of the contact segment 233 of the two stationary contacts 230 has a stationary contact 231, and the moving contact 240 is a bridge-shaped structure, with a moving contact 241 provided on the top surface of both ends, which is used to cooperate with the stationary contacts 231 of the two stationary contacts 230. The middle part of the moving contact 240 serves as a supporting part, for example, it can be placed on a contact support, and the transmission rod 400 is indirectly connected to the moving contact 240 through the contact support. When the coil 310 is energized, the moving iron core 330 and the static iron core 320 are attracted, the moving iron core 330 moves upward, and the transmission rod 400 moves upward synchronously, driving the moving contact 240 to move upward and close with the static contact 230 (that is, the moving contact 241 contacts the static contact 231), thereby closing the switch device; when the coil 310 is de-energized, the moving iron core 330 and the static iron core 320 are repelled, the moving iron core 330 moves downward, and the transmission rod 400 moves downward synchronously, driving the moving contact 240 to move downward and disconnect from the static contact 230 (that is, the moving contact 241 is separated from the static contact 231), thereby opening the switch device.

[0043] like Figure 3 As shown, the arc extinguishing chamber 220 of this embodiment includes a plurality of arc extinguishing grids, which are arranged in sequence in the up and down directions. An exhaust structure 211 is provided on the conductive unit shell 210 at a position corresponding to the arc extinguishing chamber 220. The exhaust structure 211 includes but is not limited to a plurality of slits, and may also be a plurality of circular holes or other structures.

[0044] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate directions or positional relationships based on directions or positional relationships shown in the drawings, or directions or positional relationships that are usually placed when in use, and are only for the convenience of description, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish descriptions, and cannot be understood as indicating relative importance.

[0045] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A contact drop prevention structure for a switch device, comprising an electromagnetic unit (300), a transmission rod (400) and a conductive unit (200), wherein the conductive unit (200) comprises a moving contact (240) and a stationary contact (230) that cooperate with each other, and the electromagnetic unit (300) drives the moving contact (240) and the stationary contact (230) to open and close through the transmission rod (400) to realize the opening and closing of the switch device, characterized in that: The invention also comprises an anti-drop unit (100) arranged corresponding to the transmission rod (400), the anti-drop unit (100) comprising at least two limiting members (120), a limiting gap for limiting the transmission rod (400) between the at least two limiting members (120), the limiting gap comprising a closing gap (131), a boundary gap (132) and an opening gap (133) arranged in sequence, the boundary gap (132) being smaller than the outer diameter of the transmission rod (400); when the switch device is closed, the transmission rod (400) is limited in the closing gap (131); when the switch device is tripped / opened, the transmission rod (400) expands the boundary gap (132) and is limited in the opening gap (133).

2. The contact drop prevention structure of the switch device according to claim 1, characterized in that: The limiting gap comprises two first inclined surfaces (121) arranged opposite to each other and two second inclined surfaces (122) arranged opposite to each other; the closing gap (131) is formed between the two first inclined surfaces (121); the opening gap (133) is formed between the two second inclined surfaces (122); the two first inclined surfaces (121) and the two second inclined surfaces (122) are arranged in sequence along the opening direction; the boundary gap (132) is formed between the connection points of the two first inclined surfaces (121) and the two second inclined surfaces (122); the opening direction is the moving direction of the transmission rod (400) when the switch device is opened; along the opening direction, the size of the closing gap (131) gradually decreases, and the size of the opening gap (133) gradually increases.

3. The contact-drop prevention structure of the switch device according to claim 2, characterized in that: The anti-fall unit (100) comprises two limiting members (120) forming a limiting gap, the two limiting members (120) are symmetrically arranged, and a first inclined surface (121) and a second inclined surface (122) are arranged on the inner side of the limiting members (120).

4. The contact drop prevention structure of the switch device according to claim 1, characterized in that: The limiting member (120) is a block structure made of flexible material.

5. The contact-drop prevention structure of the switch device according to claim 1, characterized in that: The surface of the limiting member (120) is coated with an anti-slip coating.

6. The contact drop prevention structure of the switch device according to claim 1, characterized in that: The anti-drop unit (100) further comprises an anti-drop unit housing (110), the limiting member (120) is installed in the anti-drop unit housing (110), and sliding holes (111) for slidingly cooperating with the transmission rod (400) are provided on both sides of the anti-drop unit housing (110), the anti-drop unit housing (110) is sleeved on the transmission rod (400) through the sliding holes (111), and the transmission rod (400) slides along the sliding holes (111) when the switch device is closed or tripped / opened.

7. The contact-drop prevention structure of the switch device according to claim 1, characterized in that: The anti-fall unit (100) further comprises an elastic member (150), and under the elastic force of the elastic member (150), the two limiting members (120) forming the limiting gap approach each other.

8. The contact-drop prevention structure of the switch device according to claim 7, characterized in that: The two limiting members (120) are each provided with an elastic member (150), the elastic member (150) being a spring, one end of the elastic member (150) being connected to the outer side of the limiting member (120), the elastic force direction of the elastic member (150) being perpendicular to the moving direction of the transmission rod (400) and perpendicular to the axial direction of the transmission rod (400).

9. The contact-drop prevention structure of a switch device according to claim 1, characterized in that: The anti-fall unit (100) further comprises at least one micro switch (160), and the transmission rod (400) cooperates with the micro switch (160) in triggering, and during the switching process of the switch device closing and tripping / opening, the transmission rod (400) moves so that the micro switch (160) switches between a triggered state and an untriggered state.

10. The contact drop prevention structure of the switch device according to claim 1, characterized in that: The switch device is a vehicle switch device. The electromagnetic unit (300) drives the moving contact (240) and the static contact (230) to open and close through a transmission rod (400). The moving contact (240) and the static contact (230) of the conductive unit (200) are installed in a conductive unit housing (210). The electromagnetic unit (300) comprises a coil (310), a static iron core (320), and a moving iron core (330). The transmission rod (400) is linked to the moving iron core (330) and penetrates into the conductive unit housing (210) to be connected with the moving contact (240). When the moving iron core (330) moves under the electromagnetic force of the coil (310), it drives the moving contact (240) to move and cooperate with the static contact (230) through the transmission rod (400).

11. The contact-drop prevention structure of the switch device according to claim 10, characterized in that: The movable iron cores (330) of the conductive unit (200) and the electromagnetic unit (300) are located on the left and right sides of the anti-drop unit (100), and the anti-drop unit (100) is located below the coil (310) of the electromagnetic unit (300), and the two limiting members (120) of the anti-drop unit (100) that form a limiting gap are located on the front and rear sides of the transmission rod (400).

12. The contact-drop prevention structure of a switch device according to claim 1, characterized in that: The conductive unit (200) comprises a moving contact (240) and two symmetrical stationary contacts (230), wherein the bottom surfaces of the two stationary contacts (230) are provided with a stationary contact point (231), and the moving contact (240) is a bridge-shaped structure, wherein a moving contact point (241) is respectively provided on the top surfaces at both ends, and is used to correspond to and cooperate with the stationary contacts (231) of the two stationary contacts (230).

13. A switchgear, characterized in that: It comprises a contact-dropping prevention structure for a switch device according to any one of claims 1 to 12.

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