Outer auxiliary device of switchgear and switchgear

Abstract

The outer auxiliary device of the switch equipment comprises an outer auxiliary device shell, an outer auxiliary switch in the outer auxiliary device shell, a pressing rod arranged in a linear moving mode and a cam arranged in a rotating mode, a cam driving hole is formed in the outer auxiliary device shell, and the cam is connected with a rotating shaft used for driving the cam to rotate through the cam driving hole. The cam is provided with a protruding driving arc face, and the pressing rod is provided with a driven face. The cam rotates, the driving cambered surface slides on the driven surface, the pressing rod is driven to move, and the pressing rod triggers the external auxiliary switch to switch the state. The switchgear comprises an operating mechanism unit and the external auxiliary device, and the cam of the external auxiliary device is directly or indirectly connected with the output shaft of the operating mechanism unit through the cam driving hole. According to the external auxiliary device and the switch equipment, the cam acts on the driven surface of the pressing rod through the driving cambered surface in the rotating process to enable the pressing rod to linearly move to press the external auxiliary switch, the external auxiliary switch button is reliably pressed in the forward direction, the action relation is simple, and the pressing action is stable and reliable.

Description

Technical Field

[0001] The utility model relates to the field of low-voltage electrical appliances, in particular to an external auxiliary device of a switch device and the switch device. Background Art

[0002] Switchgear is mainly used to isolate power supply, switch operation, connect and disconnect circuits. Some existing switchgear are also equipped with auxiliary devices in addition to the main switch to perform auxiliary functions such as control and indication. The auxiliary devices are usually driven by the action elements in the operating mechanism of the main switch to realize the auxiliary functions of the auxiliary devices. When the number of auxiliary devices in the existing switchgear is insufficient, it is necessary to set auxiliary devices outside the switchgear. The existing auxiliary devices are not suitable for rotating disconnectors. In addition, the driving structure of the auxiliary device is complex, the action relationship is complex, and there are problems such as unreliable action, easy failure, or untimely action. Summary of the invention

[0003] The utility model aims to overcome at least one defect of the prior art and provide an external auxiliary device of a switch device and a switch device.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The external auxiliary device of the switch device comprises an external auxiliary device housing, an external auxiliary switch in the external auxiliary device housing, a pressure rod arranged for linear movement and a cam arranged for rotation, the external auxiliary device housing is provided with a cam driving hole corresponding to the cam, the cam is connected to a rotating shaft for driving the cam to rotate through the cam driving hole, the cam has a raised driving arc surface, and the pressure rod is provided with a driven surface drivingly matched with the driving arc surface of the cam; when the cam rotates, the driving arc surface of the cam slides on the driven surface of the pressure rod, driving the pressure rod to move, so that the pressure rod triggers the switching state of the external auxiliary switch.

[0006] Optionally, the pressure rod has two surfaces arranged front and back, wherein a trigger groove corresponding to the button of the external auxiliary switch is provided on the front side of the pressure rod, and the back side of the pressure rod is the passive surface.

[0007] Optionally, a reset spring for resetting the pressure rod is also included; after the force of the cam on the pressure rod is removed, the reset spring drives the pressure rod to reset, so that the external auxiliary switch switches the state.

[0008] Optionally, a first installation cavity and a second installation cavity are provided in the shell of the external auxiliary device, and the first installation cavity is connected to the second installation cavity via a connecting port, and the connecting port is arranged corresponding to the button of the external auxiliary switch, the cam is rotatably installed in the first installation cavity, the pressure rod is linearly movable in the first installation cavity, the external auxiliary switch is limit-installed in the second installation cavity, and the button of the external auxiliary switch extends into the second installation cavity through the connecting port.

[0009] Optionally, the external auxiliary device shell includes a coverable connecting plate and an auxiliary cover plate, and the auxiliary cover plate is provided with the first installation cavity and the second installation cavity.

[0010] Optionally, the first mounting cavity has two symmetrical limiting side walls, the limiting side walls are provided with sliding grooves, both ends of the pressure rod are provided with sliders slidably matched with the sliding grooves, the pressure rod is limited between the two limiting side walls, and the sliders at both ends of the pressure rod can slide along the sliding grooves of the two limiting side walls.

[0011] Optionally, two ends of the pressure rod protrude toward the bottom plate of the external auxiliary device housing to form two supporting feet, the supporting feet are slidably matched with the bottom plate, and the supporting feet are placed at the connection between the bottom plate and the limiting side wall.

[0012] Optionally, the first installation cavity further has an arc-shaped side wall corresponding to the cam, and two ends of the arc-shaped side wall are butted against two limiting side walls to form an arched first installation cavity.

[0013] Optionally, a limit snap-in is provided on one side of the external auxiliary switch, and a buckle is provided on the other side, and a limit protrusion cooperating with the limit snap-in and a stop boss cooperating with the buckle are provided on the side wall of the second mounting cavity.

[0014] Optionally, there are two symmetrical external auxiliary switches, the pressure rod presses the buttons of the two external auxiliary switches at the same time, and two second installation cavities corresponding to the two external auxiliary switches are provided in the housing of the external auxiliary device.

[0015] Optionally, two second installation cavities corresponding to the two external auxiliary switches are provided in the shell of the external auxiliary device, and two symmetrical edge side walls are provided at the edge of the bottom plate. An intermediate side wall located between the two edge side walls is provided on the middle part of the bottom plate. The intermediate side wall and the two edge side walls surround two second installation cavities. The edge side wall is an L-shaped structure with two perpendicular ends. The first end of the edge side wall is vertically connected to the limiting side wall, and the intermediate side wall is perpendicular to the first end of the edge side wall and is spaced apart to form the connecting port, and is spaced apart and parallel to the second end of the edge side wall. The first installation cavity is arranged corresponding to the intermediate side wall, and the width of the first installation cavity is smaller than that of the two second installation cavities.

[0016] Optionally, the inner side protrusion of the end of the second end of the edge side wall forms a stop boss, and the inner side protrusion of one end of the middle side wall close to the connecting port forms a limit boss, and the stop boss and the limit boss are used to limit the external auxiliary switch.

[0017] A switch device comprises an operating mechanism unit and at least one external auxiliary device of the switch device described in any one of the above technical solutions, wherein a cam of the external auxiliary device is directly or indirectly connected to an output shaft of the operating mechanism unit through a cam driving hole.

[0018] In the external auxiliary device of the switch device and the switch device of the utility model, the cam acts on the driven surface of the pressure rod through the driving arc surface of the cam projection during the rotation process, so that the pressure rod moves linearly to press the external auxiliary switch, thereby realizing positive and reliable pressing of the button of the external auxiliary switch, the action relationship is simple, and the pressing action is stable and reliable.

[0019] In addition, the driving part and the driven part of the pressure rod are arranged in reverse, with a simple structure and a compact and reasonable layout. The pressure rod uses a recessed trigger groove to press the button, which can place the button in the trigger groove in advance to avoid accidental operation of the button.

[0020] In addition, the sliding block and the sliding groove are slidably matched to guide the pressing rod to move in a straight line, thereby improving the reliability of the pressing action of the pressing rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure inside the auxiliary cover plate of the utility model;

[0022] Figure 2 It is a structural schematic diagram of the front side of the pressure rod of the utility model;

[0023] Figure 3 It is a structural schematic diagram of the reverse side of the pressure rod of the utility model;

[0024] Figure 4 It is a structural schematic diagram of the auxiliary cover plate of the utility model;

[0025] Figure 5 It is an assembly drawing of the external auxiliary device of the utility model;

[0026] Figure 6 It is an exploded view of the external auxiliary device of the utility model;

[0027] Figure 7 It is a structural schematic diagram of the operating mechanism unit and the external auxiliary device of the utility model;

[0028] Figure 8 It is a schematic diagram of the structure of the operating mechanism unit and the external auxiliary device of the utility model;

[0029] Fig. 9 It is a schematic diagram of the partial structure of the operating mechanism unit of the utility model;

[0030] Connecting plate 1; fixing hole 11; positioning hole 12; cam driving hole 13; auxiliary cover plate 2; bottom plate 21; cam rotating hole 211; first mounting cavity 22; limiting side wall 221; sliding groove 222; arcuate side wall 223; second mounting cavity 23; edge side wall 231; middle side wall 232; limiting protrusion 233; blocking boss 234; connecting port 24; fixing column 25; positioning protrusion 26; spring limiting column 27; external auxiliary switch 3; button 31; limiting bayonet 32; buckle 33; pressure rod 4; actuated surface 41; trigger groove 42; slider 43; supporting foot 44; spring limiting groove 45; reset spring 5; cam 6; driving arc surface 61; output shaft 71; operating mechanism unit housing 72; operating shaft 73; second driving gear 731; transmission shaft 74; transmission gear 741; rotating member 75; push rod 76; internal auxiliary device 8. DETAILED DESCRIPTION

[0031] The following embodiments are combined with the accompanying drawings to further illustrate the specific implementation of the external auxiliary device of the switch device and the switch device of the utility model. The external auxiliary device of the switch device and the switch device of the utility model are not limited to the description of the following embodiments.

[0032] like Figure 7-9 As shown, the switch device of this embodiment includes an operating mechanism unit and at least one conductive unit, the operating mechanism unit and the conductive unit are stacked, the operating mechanism unit is connected to the conductive unit to drive the conductive unit to be turned on or off, the conductive unit includes a conductive unit housing and a contact system and an arc extinguishing system arranged in the conductive unit housing and used in conjunction with each other, the contact system includes a moving contact mechanism pivotally arranged on the conductive device housing and a static contact cooperating with the moving contact mechanism, the output shaft 71 of the operating mechanism unit is connected to the moving contact mechanism to drive it to rotate, so that the moving contact mechanism is closed or disconnected with the static contact, the moving contact mechanisms of adjacent conductive units are connected to each other, and the conductive unit is used to control the power supply to the load.

[0033] The switchgear of this embodiment further includes at least one external auxiliary device, which is stacked on the operating mechanism unit and / or the conductive unit, and the output shaft 71 of the operating mechanism unit is drive-connected to the external auxiliary device, or the movable contact mechanism of the conductive unit is drive-connected to the external auxiliary device. When the external auxiliary device is stacked on the operating mechanism unit, the output shaft 71 of the operating mechanism unit is directly drive-connected to the external auxiliary device; when the external auxiliary device is stacked on the conductive unit, the output shaft 71 of the operating mechanism unit is drive-connected to the conductive unit, and then the conductive unit drives the external auxiliary device, and the output shaft 71 of the operating mechanism unit drives the external auxiliary device through the conductive unit. The external auxiliary device can be used to feedback the state of the disconnector or perform signal control.

[0034] The operating mechanism unit includes an energy storage mechanism. When opening and closing the switch, the energy storage mechanism rotates to store energy. After passing the dead point, the energy storage mechanism releases energy to drive the output shaft 71 to rotate quickly to the opening position or the closing position. The operating mechanism unit of this embodiment includes an operating mechanism unit housing 72, and may also include an internal auxiliary device 8 in the operating mechanism unit housing 72. The energy storage mechanism is used to drive the output shaft 71 to rotate. The energy storage mechanism in this embodiment includes an operating shaft 73, a rotating member 75 and an energy storage elastic member. A push rod 5 arranged for linear movement and a transmission shaft 74 arranged for rotation are also provided in the operating mechanism unit housing 72. The operating shaft 73 is rotatably arranged, and one end of the operating shaft 73 extends out of the operating mechanism unit housing 72 for operation. The other end of the operating shaft 73 is linked to a push rod 76 and a transmission shaft 74, respectively. The operating shaft 73 has a first drive gear and a second drive gear 731. The push rod 76 has a rack structure that can mesh with the first drive gear, and the transmission shaft 74 has a transmission structure that can mesh with the second drive gear 731. Gear 741, the energy storage elastic member cooperates with the rotating member 75, the rotating member 75 rotates to rotate the energy storage elastic member to the dead point position to store energy, and the energy storage elastic member releases energy after passing the dead point position to drive the rotating member 75 to rotate; the operating shaft 73 drives the rotating member 75 to rotate through the transmission shaft 74, so that the energy storage elastic member stores energy, and after the energy storage elastic member passes the dead point, the energy is released to drive the rotating member 75 to rotate rapidly, and the rotating member 75 drives the output shaft 71 to rotate. In this embodiment, the energy storage elastic member is a compression spring (not shown in the figure), and the two compression springs are respectively arranged on both sides of the radial direction of the rotating member 75, one end of the compression spring is connected to the radial side wall of the rotating member 75, and the other end is connected to the operating mechanism unit housing 72. In this embodiment, the axial direction of the output shaft 71 is perpendicular to the axial direction of the operating shaft 73, the axial directions of the operating shaft 73 and the transmission shaft 74 are parallel, and the push rod 76 is arranged to slide linearly, and the moving direction of the push rod 76 is perpendicular to the axial direction of the operating shaft 73 and the axial direction of the output shaft 71. In addition, the output shaft 71 can be directly driven to rotate by the push rod 76. As another embodiment, the push rod 76 may not be provided.

[0035] The external auxiliary device of the switch device of this embodiment comprises an external auxiliary device housing, an external auxiliary switch 3 in the external auxiliary device housing, a pressure rod 4 arranged to move linearly, and a cam 6 arranged to rotate. The external auxiliary device housing is provided with a cam driving hole 13 corresponding to the cam 6. The cam 6 passes through the cam driving hole 13 and is linked to the output shaft 71 of the operating mechanism unit for driving the cam 6. The pressure rod 4 is arranged corresponding to the button 31 of the external auxiliary switch 3. The cam 6 has a convex driving arc surface 61. The pressure rod 4 is provided with a driven surface 41 drivingly matched with the driving arc surface 61 of the cam 6. When the cam 6 rotates, the driving arc surface 61 of the cam 6 slides on the driven surface 41 of the pressure rod 4, driving the pressure rod 4 to move, so that the pressure rod 4 triggers the switching state of the external auxiliary switch 3. In this embodiment, the cam 6 drives the pressure rod 4 to move, so that the pressure rod 4 presses the external auxiliary switch 3, and the external auxiliary switch 3 is switched from the disconnected state to the connected state, or the pressure rod 4 avoids the external auxiliary switch 3, and the external auxiliary switch 3 is switched from the connected state to the disconnected state. In the external auxiliary device and switch device of the switch device of the present embodiment, the cam 6 acts on the driven surface 41 of the pressure rod 4 through the protruding driving arc surface 61 of the cam 6 during the rotation process, so that the pressure rod 4 moves linearly to press the external auxiliary switch 3, so as to realize the positive and reliable pressing of the button 31 of the external auxiliary switch 3, the action relationship is simple, and the pressing action is stable and reliable. The cam 6 of the present embodiment passes through the cam driving hole 13 on the housing of the external auxiliary device and is linked to the output shaft 71. Of course, as other embodiments, the output shaft 71 can also pass through the cam driving hole 13 and be linked to the cam 6 in the housing of the external auxiliary device, or the cam 6 passes through the cam driving hole 13 and is connected to the driving shaft of the movable contact mechanism of the conductive unit, or a linkage member passes through the cam driving hole 13 to connect the cam 6 and the output shaft 71, or a linkage member passes through the cam driving hole 13 to connect the cam 6 and the driving shaft of the movable contact mechanism of the conductive unit, all of which are possible, that is, the cam 6 can be directly or indirectly connected to a rotating shaft for driving the cam 6 to rotate. The rotating shaft may be the output shaft 71 of the operating mechanism unit, the driving shaft of the moving contact mechanism of the conductive unit, or a linkage. It should be noted that the switch device of this embodiment may be a disconnector, a circuit breaker, etc. The external auxiliary switch 3 of this embodiment may be a micro switch, etc. If the external auxiliary switch 3 is a normally closed switch, the cam 6 drives the pressure rod 4 to move, so that when the pressure rod 4 presses the external auxiliary switch 3, the external auxiliary switch 3 is switched from the on state to the off state, and when the pressure rod 4 avoids the external auxiliary switch 3, the external auxiliary switch 3 is switched from the off state to the on state.

[0036] like Figure 2-3As shown, in this embodiment, the moving direction of the pressure rod 4 is parallel to the pressing direction of the button 31 and is perpendicular to the axis of the cam 6. The pressure rod 4 has two surfaces arranged in front and back, wherein the front side of the pressure rod 4 is provided with a trigger groove 42 corresponding to the button 31 of the external auxiliary switch 3, and the back side of the pressure rod 4 is the actuated surface 41. Specifically, two trigger grooves 42 are arranged on the front side of the pressure rod 4, and a spring limiting groove 45 is also provided between the two trigger grooves 42. The driving part and the actuated part of the pressure rod 4 are arranged in front and back, with a simple structure, compact and reasonable layout, and the pressure rod 4 uses the concave trigger groove 42 to press the button 31, so that the button 31 can be placed in the trigger groove 42 in advance to avoid misoperation of the button 31.

[0037] like Figure 4-7 As shown, the housing of the external auxiliary device of this embodiment includes a coverable connecting plate 1 and an auxiliary cover plate 2, wherein the connecting plate 1 is used to be fixed on the operating mechanism unit housing 72, and the auxiliary cover plate 2 has a bottom plate 21 opposite to the connecting plate 1, and the auxiliary cover plate 2 is provided with a first mounting cavity 22 and a second mounting cavity 23, wherein the first mounting cavity 22 and the second mounting cavity 23 are connected via a connecting port 24, and the connecting port 24 is arranged corresponding to the button 31 of the external auxiliary switch 3, and the cam 6 is rotatably mounted in the first mounting cavity 22, and the outer end of the cam 6 is inserted into the cam rotating hole 211 of the bottom plate 21 and can rotate, and the inner end of the cam 6 passes through the cam driving hole 13 of the connecting plate 1 and is connected to the output shaft 71 ( Figure 8 ) are linked and connected, the pressure rod 4 is linearly movable and arranged in the first installation cavity 22, the external auxiliary switch 3 is limitedly installed in the second installation cavity 23, and the button 31 of the external auxiliary switch 3 extends into the second installation cavity 23 through the connecting port 24. The external auxiliary device of this embodiment is stacked on the operating mechanism unit, and the output shaft 71 of the operating mechanism unit is directly linked and connected with the cam 6 of the external auxiliary device. The housing of the external auxiliary device of this embodiment is assembled by the connecting plate 1 and the auxiliary cover plate 2, and has a simple structure and is easy to install. Of course, as other embodiments, the housing of the external auxiliary device can also be provided with no connecting plate 1, and the auxiliary cover plate 2 is directly fixed on the housing 72 of the operating mechanism unit.

[0038] like Figure 1 As shown, the external auxiliary device of the switch device of this embodiment also includes a reset spring 5 for resetting the pressure rod 4, and the elastic force direction of the reset spring 5 is parallel to the moving direction of the pressure rod 4. When the cam 6 rotates forward and drives the pressure rod 4 to switch the external auxiliary switch 3 to the on state, the reset spring 5 stores energy; when the cam 6 rotates reversely and the force of the cam 6 on the pressure rod 4 is removed, the reset spring 5 releases energy and drives the pressure rod 4 to reset, so that the external auxiliary switch 3 is switched to the off state. Specifically, the reset spring 5 is a compression spring, one end of which abuts against the spring limit groove 45 ( Figure 2), and the other end is sleeved on the spring limiting column 27 of the auxiliary cover plate 2. Of course, the reset spring 5 can also be other elastic parts such as a torsion spring and a leaf spring.

[0039] like Figure 1-4 As shown, the first installation cavity 22 of the auxiliary cover plate 2 has two symmetrical limiting side walls 221, and the first installation cavity 22 of the auxiliary cover plate 2 also has an arcuate side wall 223 corresponding to the cam 6. The arcuate side wall 223 and the limiting side wall 221 are arranged along the edge of the bottom plate 21, and the two ends of the arcuate side wall 223 are connected with the two limiting side walls 221 to form an arched first installation cavity 22. The limiting side wall 221 is provided with a slide groove 222, and the two ends of the pressure rod 4 are provided with sliders 43 that are slidably matched with the slide groove 222. The pressure rod 4 is limited between the two limiting side walls 221, and the sliders 43 at the two ends of the pressure rod 4 can slide along the slide grooves 222 of the two limiting side walls 221. The slider 43 is slidably matched with the slide groove 222 to guide the pressure rod 4 to move linearly, thereby improving the reliability of the pressing action of the pressure rod 4. The two ends of the pressure rod 4 protrude toward the bottom plate 21 of the auxiliary cover plate 2 to form two supporting feet 44, which are slidably matched with the bottom plate 21, and are placed at the connection between the bottom plate 21 of the auxiliary cover plate 2 and the limiting side wall 221. The setting of the supporting feet 44 raises the pressure rod 4, reduces the friction resistance of the pressure rod 4, and makes it easier to push the pressure rod 4.

[0040] like Figure 1 and Figure 4 As shown, the connecting plate 1 is provided with a fixing hole 11 and a positioning hole 12, the auxiliary cover plate 2 is provided with a fixing column 25 matched with the fixing hole 11 and a positioning protrusion 26 matched with the positioning hole 12, and the fixing column 25 of the auxiliary cover plate 2 is fixed to the fixing hole 11 of the connecting plate 1 by hot riveting. The auxiliary cover plate 2 and the connecting plate 1 are fixed by hot riveting, which has a simple structure, simple installation and is firm. Of course, the auxiliary cover plate 2 and the connecting plate 1 can also be fixed by screws or other fixing methods.

[0041] like Figure 1 and Figure 4 As shown, a limit bayonet 32 ​​is provided on one side of the external auxiliary switch 3, and a buckle 33 is provided on the other side. A limit protrusion 233 matched with the limit bayonet 32 ​​and a stop boss 234 matched with the buckle 33 are provided on the side wall of the second mounting cavity 23 of the auxiliary cover plate 2. The setting of the limit protrusion 233 and the stop boss 234 of the auxiliary cover plate 2 realizes the limit of the external auxiliary switch 3, and the external auxiliary switch 3 is convenient and quick to disassemble and install.

[0042] like Figure 1 As shown, the external auxiliary device of the switch device of this embodiment has two symmetrical external auxiliary switches 3, and the pressure rod 4 presses the buttons 31 of the two external auxiliary switches 3 at the same time. Figure 1 and Figure 4 As shown, the auxiliary cover plate 2 is provided with two second mounting cavities 23 corresponding to the two external auxiliary switches 3 one by one. Specifically, two symmetrical edge side walls 231 are provided along the edge of the bottom plate 21, and an intermediate side wall 232 located between the two edge side walls 231 is provided on the middle part of the bottom plate 21, and two second installation cavities 23 are formed between the intermediate side wall 232 and the two edge side walls 231. The edge side wall 231 is an L-shaped structure with two perpendicular ends. The first end of the edge side wall 231 is perpendicularly connected to the limiting side wall 221, and the intermediate side wall 232 is perpendicular to and spaced from the first end of the edge side wall 231 to form the connecting port 24, and is arranged parallel to and spaced from the second end of the edge side wall 231. The inner side of the end of the second end of the edge side wall 231 is protruded to form the abutting boss 234, and the inner side of one end of the intermediate side wall 232 close to the connecting port 24 is protruded to form the limiting boss 233, and a protruding spring limiting column 27 is provided on one end of the intermediate side wall 232. The first installation cavity 22 is arranged corresponding to the middle side wall 232 , and the width of the first installation cavity 22 is smaller than that of the two second installation cavities 23 , so that the external auxiliary device is in a convex shape as a whole, and has a compact structure.

[0043] 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.

[0044] 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. An external auxiliary device for a switchgear, characterized in that: The invention comprises an external auxiliary device housing, an external auxiliary switch (3) in the external auxiliary device housing, a pressure rod (4) arranged to move linearly, and a cam (6) arranged to rotate. The external auxiliary device housing is provided with a cam driving hole (13) corresponding to the cam (6). The cam (6) is connected to a rotating shaft for driving the cam (6) to rotate through the cam driving hole (13). The cam (6) has a convex driving arc surface (61). The pressure rod (4) is provided with a driven surface (41) drivingly matched with the driving arc surface (61) of the cam (6). When the cam (6) rotates, the driving arc surface (61) of the cam (6) slides on the driven surface (41) of the pressure rod (4), driving the pressure rod (4) to move, so that the pressure rod (4) triggers the external auxiliary switch (3) to switch state.

2. The external auxiliary device of the switchgear according to claim 1, characterized in that: The pressure rod (4) has two surfaces arranged front and back, wherein a trigger groove (42) corresponding to the button (31) of the external auxiliary switch (3) is arranged on the front side of the pressure rod (4), and the back side of the pressure rod (4) is the actuated surface (41).

3. The external auxiliary device of the switchgear according to claim 1, characterized in that: It also includes a reset spring (5) for resetting the pressure rod (4); after the force of the cam (6) on the pressure rod (4) is removed, the reset spring (5) drives the pressure rod (4) to reset, so that the external auxiliary switch (3) switches state.

4. The external auxiliary device of the switchgear according to claim 1, characterized in that: A first mounting cavity (22) and a second mounting cavity (23) are provided in the housing of the external auxiliary device. The first mounting cavity (22) and the second mounting cavity (23) are connected via a connecting port (24). The connecting port (24) is arranged corresponding to a button (31) of the external auxiliary switch (3). The cam (6) is rotatably mounted in the first mounting cavity (22). The pressure rod (4) is linearly movable in the first mounting cavity (22). The external auxiliary switch (3) is limitedly mounted in the second mounting cavity (23). The button (31) of the external auxiliary switch (3) extends into the second mounting cavity (23) through the connecting port (24).

5. The external auxiliary device of the switchgear according to claim 4, characterized in that: The external auxiliary device housing comprises a coverable connecting plate (1) and an auxiliary cover plate (2), and the auxiliary cover plate (2) is provided with the first installation cavity (22) and the second installation cavity (23).

6. The external auxiliary device of the switchgear according to claim 4, characterized in that: The first installation cavity (22) has two symmetrical limiting side walls (221), and a sliding groove (222) is provided on the limiting side wall (221). Both ends of the pressure rod (4) are provided with sliders (43) that slidably cooperate with the sliding groove (222). The pressure rod (4) is limited between the two limiting side walls (221), and the sliders (43) at both ends of the pressure rod (4) can slide along the sliding grooves (222) of the two limiting side walls (221).

7. The external auxiliary device of the switchgear according to claim 6, characterized in that: The two ends of the pressure rod (4) protrude toward the bottom plate (21) of the external auxiliary device housing to form two supporting feet (44), the supporting feet (44) are slidably matched with the bottom plate (21), and the supporting feet (44) are placed at the connection between the bottom plate (21) and the limiting side wall (221).

8. The external auxiliary device of the switchgear according to claim 6, characterized in that: The first installation cavity (22) further comprises an arc-shaped side wall (223) corresponding to the cam (6), and two ends of the arc-shaped side wall (223) are butted against two limiting side walls (221) to form an arched first installation cavity (22).

9. The external auxiliary device of the switchgear according to claim 4, characterized in that: The external auxiliary switch (3) is provided with a limit snap-in (32) on one side and a buckle (33) on the other side, and the side wall of the second mounting cavity (23) is provided with a limit protrusion (233) cooperating with the limit snap-in (32) and a stop boss (234) cooperating with the buckle (33).

10. The external auxiliary device of the switchgear according to claim 4, characterized in that: The invention has two symmetrical external auxiliary switches (3), a pressing rod (4) presses buttons (31) of the two external auxiliary switches (3) at the same time, and two second installation cavities (23) corresponding to the two external auxiliary switches (3) are arranged in the housing of the external auxiliary device.

11. The external auxiliary device of the switchgear according to claim 8, characterized in that: Two second installation cavities (23) corresponding to the two external auxiliary switches (3) are arranged in the housing of the external auxiliary device. The edge of the bottom plate (21) of the housing of the external auxiliary device is provided with two symmetrical edge side walls (231). An intermediate side wall (232) located between the two edge side walls (231) is arranged on the middle part of the bottom plate (21). The intermediate side wall (232) and the two edge side walls (231) are surrounded to form two second installation cavities (23). The edge side wall (231) is an L-shaped structure with two perpendicular ends. The first end of the edge side wall (231) is perpendicularly connected to the limiting side wall (221). The intermediate side wall (232) is perpendicular to the first end of the edge side wall (231) and is spaced to form the communication port (24). The intermediate side wall (232) is spaced parallel to the second end of the edge side wall (231). The first installation cavity (22) is arranged corresponding to the intermediate side wall (232). The width of the first installation cavity (22) is smaller than that of the two second installation cavities (23).

12. The external auxiliary device of the switchgear according to claim 11, characterized in that: The inner side of the second end of the edge side wall (231) protrudes to form a stop boss (234), and the inner side of one end of the middle side wall (232) close to the connecting port (24) protrudes to form a limit boss (233). The stop boss (234) and the limit boss (233) are used to limit the external auxiliary switch (3).

13. A switchgear, characterized in that: It comprises an operating mechanism unit and at least one external auxiliary device of a switch device as claimed in any one of claims 1 to 12, wherein a cam (6) of the external auxiliary device is directly or indirectly connected to an output shaft (71) of the operating mechanism unit via a cam drive hole (13).

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