CN212570777U - Mechanical interlocking device of switch electric appliance - Google Patents

Abstract

A mechanical interlocking device of a switch electric appliance comprises an interlocking mechanism, wherein the interlocking mechanism comprises two interlocking pieces which are respectively pivoted and installed in a shell of the interlocking mechanism, the two interlocking pieces are respectively used for limiting the contact supports of the two switch electric appliances, one ends of the two interlocking pieces are connected through springs, and the other ends of the two interlocking pieces are mutually limited and matched and are respectively connected with the switch electric appliances on two sides; when any switching device is closed, the interlocking pieces connected with each other are supported and driven to rotate through the contacts to limit and form interlocking with the interlocking pieces of the switching device of which the other side is not closed, when the closed switching device is reset, the springs can drive the two interlocking pieces to reset and remove the interlocking, and the two interlocking pieces are driven to reset through one spring.

Description

Mechanical interlocking device of switch electric appliance

Technical Field

The utility model relates to a low-voltage apparatus field especially relates to a switching device's mechanical interlock.

Background

Switching devices such as contactors and circuit breakers are often used for controlling the on-off of circuits, a reversible switching device or a dual-power product is formed by two contactors, a mechanical interlocking device needs to be arranged between the switching devices in order to prevent two paths of power supplies from being switched on simultaneously, and when one contactor is closed, the mechanical interlocking device can lock the other contactor to prevent the other contactor from being closed.

However, the conventional mechanical interlocking device of the switching electric appliance has a complex structure, is difficult to assemble and has high cost. In addition, the existing switching devices are usually installed on a standard guide rail or an installation base plate, and although two switching devices can be directly connected through a mechanical interlocking device, the mechanical interlocking device is easy to loosen or fall off due to factors such as vibration and the like, so that the function of mechanical interlocking fails. In order to avoid the potential safety hazard, the connecting piece can be additionally arranged on the mechanical interlocking device and connected between the two switching devices through the connecting piece, but the existing connecting piece cannot simultaneously meet two installation modes of the standard guide rail and the installation bottom plate, the connecting piece is required to be replaced when being installed on the standard guide rail and the installation bottom plate, and the use is very inconvenient.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's defect, provide a can simple structure, the high mechanical interlock of switching apparatus of reliability.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a mechanical interlocking device of a switch electric appliance comprises an interlocking mechanism, wherein the interlocking mechanism comprises two interlocking pieces which are respectively pivoted and installed in a shell of the interlocking mechanism, the two interlocking pieces are respectively used for limiting the contact supports of the two switch electric appliances, one ends of the two interlocking pieces are connected through springs, and the other ends of the two interlocking pieces are mutually limited and matched and are respectively connected with the switch electric appliances on two sides; when any switching device is closed, the interlocking pieces connected with the driving device are supported by the contact to rotate, the interlocking pieces connected with the other side of the switching device which is not closed are limited and form interlocking, and when the closed switching device is reset, the spring can drive the two interlocking pieces to reset and release the interlocking.

Preferably, the two interlocking pieces are identical in structure and symmetrically arranged, the two interlocking pieces respectively comprise a pivot part, a spring part and a driving part, the spring part and the driving part are respectively arranged on two sides of the pivot part, the driving part comprises a linkage part and a locking part which are arranged in a stacked mode, the pivot parts of the two interlocking pieces are respectively installed in a shell of the interlocking mechanism in a pivot mode, the sides, provided with the locking parts, of the linkage parts of the two interlocking pieces are opposite to each other, the locking parts of the two interlocking pieces are located between the two linkage parts, linkage shafts are respectively arranged on the sides, far away from the locking parts, of the linkage parts of the two interlocking pieces, long strip-shaped avoiding holes for avoiding the linkage shafts are respectively arranged on the two half shells, the two linkage shafts respectively penetrate through the avoiding holes to be connected with the contacts of the corresponding switching appliances on two.

Preferably, the locking parts of the interlocking pieces are fan-shaped, the middle of the arc surface of the locking part is provided with a locking protrusion, one side of the locking protrusion is provided with a locking groove, the locking protrusions on the locking parts of the two interlocking pieces are oppositely arranged, and when the switching electrical appliance is closed, the corresponding interlocking piece is driven to rotate, so that the locking protrusion of the locking part on the interlocking piece slides into the locking groove on the locking part on the other interlocking piece to prevent the interlocking piece from rotating downwards.

Preferably, the interlocking device further comprises a connecting piece arranged below the interlocking mechanism, the two sides of the connecting piece are respectively connected with the shells of the two switching devices, the top surface of the connecting piece is in limit fit with the interlocking mechanism, two oppositely arranged positioning bosses are arranged on the bottom surface of the connecting piece, a yielding groove is correspondingly arranged between the two positioning bosses on the bottom surface of the connecting piece, the two positioning bosses of the connecting piece are respectively used for limiting a bottom plate or a guide rail on the bottom plate, and the yielding groove is used for yielding screws used for connecting the bottom plate on the guide rail.

Preferably, the connecting piece is a flat box-shaped structure which is perpendicular to the bottom plate, and the bottom surface of the connecting piece is downward opened.

Preferably, the cross section of the guide rail is of a U-shaped structure, the guide rail comprises two side guide parts which are oppositely arranged and a bottom guide part which is connected between the bottoms of the two side guide parts, the outer sides of the tops of the two side guide parts are respectively provided with a transverse guide part, a guide groove is formed by surrounding the two side guide parts which are oppositely arranged and the bottom guide part, the bottom guide part is provided with a screw hole, a screw penetrates through the screw hole to be connected with the bottom plate, and the bottom of the shell of the switching device is provided with a clamping groove which is formed in a limiting mode and is sleeved on the two transverse guide parts of.

Preferably, the height of the positioning boss is not higher than the depth of the guide groove, so that two sides of the connecting piece are positioned in the guide groove and are respectively in limit fit with the two side guide parts.

Preferably, a top plate boss is arranged in the middle of the top side of the connecting piece, and a top plate groove matched with the top plate boss is arranged on the bottom side of the casing of the interlocking mechanism.

Preferably, the connecting piece comprises two oppositely arranged clamping plates, two side plates respectively connected between one ends of the two clamping plates, and a top plate connected between the two clamping plates and the top ends of the two side plates, two limiting parts connected with the shells of the corresponding switch electrical appliances are respectively arranged on the outer sides of the two clamping plates, and two limiting grooves in limiting fit with the corresponding limiting parts are arranged on the shells of the two switch electrical appliances; the bottom surfaces of the two clamping plates are respectively provided with two oppositely arranged positioning bosses, and the bottom surfaces of the two clamping plates are respectively provided with a yielding groove between the two positioning bosses correspondingly.

Preferably, the locating part is a long strip-shaped structure which is parallel to the height direction of the connecting piece, the width of the locating part is gradually increased along the direction of keeping away from the clamping plate, the bottom end of the limiting groove on the shell of the switching device is opened downwards, and the inner diameter of the limiting groove gradually shrinks from inside to outside.

Preferably, an insertion boss is arranged on the outer side of the casing of the interlocking mechanism, and two insertion grooves matched with the two insertion bosses are arranged on the outer side of the casing of the switching electric appliance.

The utility model discloses a switching electrical apparatus's mechanical interlocking device resets through two interlocking parts of a spring drive, and not only the part is few, simple structure, with low costs, can guarantee moreover that the position after two interlocking parts reset is the same, avoids two interlocking parts to drive respectively by two springs and resets back asymmetry, prevents to appear locking dead problem.

Particularly, the middle of the cambered surface of the locking part is provided with a locking protrusion, one side of the locking protrusion is provided with a locking groove, when the switching electrical appliance is switched on, a contact of the switching electrical appliance supports downward movement and drives a linkage shaft to drive a corresponding interlocking part to rotate, so that the locking protrusion of the locking part on the interlocking part slides into the locking groove on the other interlocking part to prevent the interlocking part from rotating downward, the locking is reliable, and the locking is convenient to be symmetrical after resetting.

In addition, through setting up the location boss and stepping down the recess in the bottom surface of connecting piece, when switching apparatus direct mount was on the bottom plate or was installed on the guide rail of bottom plate, the location boss not only can with bottom plate or the spacing cooperation of guide rail, the recess of stepping down moreover can dodge the screw that is used for connecting the bottom plate on the guide rail, on the basis of reliably connecting two switching apparatus, provides stable supporting role for the connecting piece.

Drawings

FIG. 1 is a schematic structural view of a connecting member mounted on a base plate according to an embodiment of the present invention;

FIG. 2 is a schematic structural view illustrating a connecting member of an embodiment of the present invention mounted on a guide rail;

fig. 3 is an exploded view of the embodiment of the present invention shown in fig. 2;

FIG. 4 is a schematic structural view of a side surface of a connecting member according to an embodiment of the present invention;

FIG. 5 is a schematic structural view of a bottom surface of a connecting member according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a switching device according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of an interlocking mechanism according to an embodiment of the present invention;

fig. 8 is an exploded view of one side of an interlocking mechanism (with an interlocking member) according to an embodiment of the invention;

fig. 9 is an exploded view of the other side of the interlocking mechanism (with the interlocking member) according to an embodiment of the present invention;

fig. 10 is a schematic view illustrating the interlocking principle of two interlocking members according to the embodiment of the present invention.

Detailed Description

The following describes a mechanical interlock device for a switching device according to the present invention with reference to the embodiments shown in fig. 1 to 10. The mechanical interlock device of the switching apparatus of the present invention is not limited to the description of the following embodiments.

As shown in fig. 1 to 3, the mechanical interlocking device of the switching apparatus of the present invention includes an interlocking mechanism 100, the interlocking mechanism 100 includes two interlocking pieces 110 respectively pivotally installed in a housing of the interlocking mechanism 100, the two interlocking pieces 110 are respectively used for limiting contact supports 310 of two switching apparatuses 300, one ends of the two interlocking pieces 110 are connected through a spring 120, and the other ends of the two interlocking pieces 110 are mutually limit-fitted and respectively connected to the switching apparatuses 300 on both sides; when any one of the switching devices 300 is closed, the interlocking piece 110 connected with the switching device 300 is supported and driven by the contact to rotate to limit and form interlocking with the interlocking piece 110 of the other side of the switching device 300 which is not closed, and when the closed switching device 300 is reset, the spring 120 can drive the two interlocking pieces 110 to reset and release the interlocking.

The utility model discloses a switching apparatus's mechanical interlocking device resets through two interlocking pieces 110 of a spring drive, and not only the part is few, simple structure, with low costs, can guarantee moreover that two interlocking pieces 110 position after resetting is the same, avoids two interlocking pieces 110 to drive respectively by two springs and resets back asymmetry, prevents to appear locking dead problem.

Further, the interlocking device comprises a connecting piece 200 arranged below the interlocking mechanism 100, two sides of the connecting piece 200 are respectively connected with the shells of the two switching apparatuses 300, the top surface of the connecting piece 200 is in limit fit with the interlocking mechanism 100, two oppositely arranged positioning bosses 210 are arranged on the bottom surface of the connecting piece 200, a yielding groove 220 is correspondingly arranged between the two positioning bosses 210 on the bottom surface of the connecting piece 200, the two positioning bosses 210 of the connecting piece 200 are respectively used for limiting a guide rail 420 on the bottom plate 410 or the bottom plate 410, and the yielding groove 220 is used for yielding a screw 430 which is arranged on the guide rail 420 and is used for connecting the bottom plate 410. The utility model discloses a switching apparatus's mechanical interlock, through setting up location boss 210 and the recess 220 of stepping down in the bottom surface at connecting piece 200, switching apparatus 300 direct mount is on bottom plate 410 or when installing on the guide rail 420 of bottom plate 410, location boss 210 not only can with bottom plate 410 or the spacing cooperation of guide rail 420, the recess 220 of stepping down moreover can dodge the screw that is used for connecting the bottom plate on the guide rail 420, on the basis of reliably connecting two switching apparatus 300, provide stable supporting role for connecting piece 200.

As shown in fig. 4 to 5, which illustrate a preferred embodiment of the connector 200, the connector 200 is a flat box-shaped structure disposed perpendicular to the base plate 410, and the bottom surface of the connector 200 is downwardly open. The connecting piece 200 with the flat box-shaped structure is hollow inside, so that the weight is light, materials can be saved, and the connecting piece has the characteristics of energy conservation and environmental protection.

Specifically, the connecting member 200 includes two splint 201 that set up relatively and two curb plates 202 of connecting respectively between two splint 201 one ends, and the roof 203 of connecting between two splint 201 and two curb plate 202 tops, respectively be equipped with two relative location bosss 210 that set up in the bottom surface of two splint 201, and the bottom surface correspondence of two splint 201 is equipped with the recess 220 of stepping down respectively between two location bosss 210, the outside of two splint 201 respectively is equipped with two locating parts 230 of being connected with the casing that corresponds switch apparatus 300, be equipped with two on the casing of two switch apparatus 300 and correspond the spacing complex spacing groove 2300 of locating part 230. Of course, it is also possible to provide the positioning boss 210 and the abdicating groove 220 on only one splint 201, which all belong to the protection scope of the present invention. The connecting member 200 is connected to the housings of the two switching devices 300 through the limiting member 230, so that the two switching devices are fixed as a whole, thereby greatly improving stability.

Further, the recess 220 of stepping down is arc, and arc lets for recess 220 not only can dodge screw 430 better, but also can be connected with the side of location boss 210, plays the effect of support, improves the structural strength of location boss 210, avoids damaging. Of course, the abdicating groove 220 can also be polygonal, all belonging to the protection scope of the present invention.

Further, the limiting member 230 is a long strip-shaped structure disposed parallel to the height direction of the connecting member 200, the transverse cross section of the limiting member 230 is dovetail-shaped (trapezoid), and is similar to a "T" shaped structure, that is, the width of the limiting member 230 gradually increases along the direction away from the clamping plate 201, the bottom end of the limiting groove 2300 on the housing of the switch electrical apparatus 300 is opened downward, and the inner diameter of the limiting groove 2300 gradually shrinks from inside to outside. The limiting members 230 are respectively pushed into the bottoms of the corresponding limiting grooves 2300, the connecting pieces 200 are assembled in place when the limiting members 230 slide in place, the edges of the openings at the outer sides of the limiting grooves 2300 are clamped at the two sides of the limiting members 230, so that the connecting pieces 200 are connected with the shell of the switching electrical appliance 300, when the two sides of the connecting pieces 200 are respectively connected with the two switching electrical appliances 300, the two switching electrical appliances 300 are reliably connected together, even if vibration and shaking occur, the two switching electrical appliances 300 cannot move relatively, and the reliability of the interlocking mechanism 100 is ensured. Of course, the limiting member 230 may also be in an L-shape or other structures, or the limiting member 230 may also be in a buckle or other structures, which all belong to the protection scope of the present invention.

As shown in fig. 2-3, the cross section of the guide rail 420 is a U-shaped structure, the guide rail 420 includes two side guide portions 421 disposed opposite to each other, and a bottom guide portion 422 connected between bottom ends of the two side guide portions 421, lateral guide portions 423 are respectively disposed on outer sides of top ends of the two side guide portions 421, a guide groove is defined between the two side guide portions 421 and the bottom guide portion 422 disposed opposite to each other, an elongated screw hole 424 is disposed on the bottom guide portion 422, a screw 430 penetrates through the screw hole 424 to be connected with the bottom plate 410, the bottom guide portion 422 is fixed on the bottom plate 410, a slot 330 is disposed at a bottom of a housing of the switching device 300 and is disposed at a position above the two lateral guide portions 423 of the guide rail 420, and a bottom of the housing of the switching device 300 is fixed to the guide rail. The two positioning bosses 210 are respectively limited by the contact of the screw 430 with the bottom guide part 422. Of course, the guide rail 420 may have other shapes, the bottom plate 410 may be a surface of a machine, an inner wall of a switch cabinet, a bracket in the switch cabinet, or the like, the bottom plate 410 is not a specific part, and the bottom plate 410 may be any plane, which all belong to the protection scope of the present invention.

Further, the height of the positioning boss 210 is not higher than the depth of the guide groove, so that the two side plates 202 of the connector 200 can be located in the guide groove and are respectively in limit fit with the two side guide portions 421. By clamping the two side guides 421 onto the two side plates 202 on the two sides of the connector 200, not only can support the two sides of the connector 200, but also the switch 300 and the connector 200 can be uniformly mounted on the guide rail 420.

Further, a top plate boss 204 is provided in the middle of the top plate 203 on the top side of the connecting member 200, and a top plate groove 2040 (fig. 7) which is engaged with the top plate boss 204 is provided on the bottom side of the housing of the interlocking mechanism 100. While the connector 200 supports the interlock mechanism 100 from the underside, the top plate boss 204 can be inserted into the top plate recess 2040 to laterally restrain the interlock mechanism 100.

As shown in fig. 7 to 10, which illustrate a preferred embodiment of the interlocking mechanism 100, a housing of the interlocking mechanism 100 includes two half shells 130 that are disposed opposite to each other, two interlocking members 110 that are disposed in the housing of the interlocking mechanism 100 and are in limit fit with each other are provided, the two interlocking members 110 are respectively used for limiting contact supports 310 of two switching apparatuses 300, two insertion bosses 150 are respectively disposed on outer sides of the half shells 130, two insertion grooves 1500 that are respectively matched with the two insertion bosses 150 are disposed on outer sides of the housing of the switching apparatuses 300, and the interlocking mechanism 100 and the switching apparatuses 300 are fixed.

Further, the two interlocking members 110 are identical in structure and are symmetrically arranged, the two interlocking members 110 respectively include a pivot part 111, the driving part comprises linkage parts 113 and locking parts 114 which are arranged in a stacked mode, the pivot parts 111 of the two interlocking pieces 110 are respectively installed in the shell of the interlocking mechanism 100 in a pivoted mode, the sides, provided with the locking parts 114, of the linkage parts 113 of the two interlocking pieces 110 are arranged oppositely, the locking parts 114 of the two interlocking pieces 110 are located between the two linkage parts 113, linkage shafts 115 are respectively arranged on the side faces, far away from the locking parts 114, of the linkage parts 113 of the two interlocking pieces 110, long strip-shaped avoidance holes 14 used for avoiding the linkage shafts 115 are respectively formed in the two half shells 130, the two linkage shafts 115 respectively penetrate through the avoidance holes 14 to be connected with the contact supports 310 of the corresponding switching appliances 300 on the two sides, and the spring parts 112 of the two interlocking pieces 110 are connected through springs 120.

When the switching apparatus 300 on one side is closed, the contact support 310 of the switching apparatus 300 drives the corresponding interlocking member 110 to rotate through the linkage shaft 115, so that the locking portion 114 of the interlocking member 110 limits the locking portion 114 of the other interlocking member 110, the limited interlocking member 110 can block the contact support 310 of the switching apparatus 300 on the other side from moving towards a closing direction, only one contact 300 can be closed at the same time, and the interlocking of the two switching apparatuses 300 is realized. In the embodiment, the two interlocking pieces 110 are driven to reset by one spring, so that not only are fewer parts, simple structure and low cost, but also the two interlocking pieces 110 can be ensured to be at the same position after being reset, and the two interlocking pieces 110 are prevented from being driven to reset by the two springs respectively and then are asymmetrical, thereby preventing the problem of locking.

Further, the locking parts 114 of the interlocking parts 110 are fan-shaped, the middle of the arc surfaces of the locking parts 114 is provided with a locking protrusion 116, one side of the locking protrusion 116 is provided with a locking groove 117, the locking protrusions 116 on the locking parts 114 of the two interlocking parts 110 are oppositely arranged, when the switching device 300 is switched on, the contact support of the switching device 300 moves downwards and drives the linkage shaft 115 to drive the corresponding interlocking part 110 to rotate, so that the locking protrusion 116 of the locking part 114 on the interlocking part 110 slides into the locking groove 117 on the other interlocking part 110 to prevent the interlocking part 110 from rotating downwards, the contact support of the switching device 300 which is not switched on the other side is prevented from moving downwards and switching on by blocking the interlocking part 110 connected with the switching device 300 on the other side, the interlocking part 110 rotates to further realize the interlocking of the two interlocking parts 110, and simultaneously, when the switching device 300 is switched on, the interlocking part 110 rotates to pull the, after the closed switching electrical appliance 300 is disconnected, the corresponding interlocking piece 110 is driven to reset by the spring 120, or the contact support 310 of the switching electrical appliance 300 drives to reset, so that the clamping stagnation problem is not easy to occur, and the switching electrical appliance has the characteristic of high resetting speed. Of course, the locking portions 114 of the two interlocking members 110 can be interlocked by other structures, which falls within the scope of the present invention.

Further, in the two half shells 130, the inner side of one half shell 130 is provided with a pivot 131, the inner side of the other half shell 130 is provided with a sleeve 132 sleeved on the pivot 131, the pivot parts 111 of the two interlocking members 110 are respectively provided with a pivot hole 133, when the two half shells 130 are assembled together, the inner side of the sleeve 132 is sleeved on the pivot 131, and the pivot hole 133 of the pivot part 111 is sleeved on the outer side of the sleeve 132 for rotating fit. Of course, it is within the scope of the present invention that the two interlocking members 110 may be pivotally mounted on the two half shells 130, respectively. Preferably, the two half shells 130 are connected through a buckle structure, a buckle is arranged on one of the half shells 130, a clamping groove matched with the buckle is arranged on the other half shell 130, and the buckle structure connection has the characteristics of simple structure and convenience in assembly.

The switching device 300 of the present embodiment is a contactor, and the switching device 300 may also be a circuit breaker or other switching devices for controlling the on/off of a line. As an embodiment of the switching apparatus 300, the contactor includes a contact support 310, a moving contact disposed on the contact support, a static contact matched with the moving contact, and an electromagnetic system matched with the contact support 310, where the static contact and the moving contact are respectively connected to a circuit, or the contactor includes two static contacts and the two static contacts are respectively connected to a circuit, the electromagnetic system can drive the contact support 310 to move and drive the moving contact to contact with the static contact, so that a loop is formed between the static contact and the moving contact, or between the two static contacts through the moving contact, thereby conducting the connected circuit, the interlocking mechanism 100 is respectively linked with the contact supports 310 of the two switching apparatuses 300 through the two interlocking members 110, and is simultaneously interlocked with each other, thereby preventing the circuits connected to the two switching apparatuses 300 from being simultaneously conducted.

The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims (10)

1. A mechanical interlocking device of a switch electric appliance is characterized in that: the interlocking device comprises an interlocking mechanism (100), wherein the interlocking mechanism (100) comprises two interlocking pieces (110) which are respectively and pivotally arranged in a shell of the interlocking mechanism (100), the two interlocking pieces (110) are respectively used for limiting contact supports (310) of two switching appliances (300), one ends of the two interlocking pieces (110) are connected through a spring (120), and the other ends of the two interlocking pieces (110) are mutually in limit fit and are respectively connected with the switching appliances (300) on two sides; when any one of the switching electric appliances (300) is closed, the contact supports (310) drive the connected interlocking pieces (110) to rotate, the interlocking pieces (110) connected with the other side of the switching electric appliance (300) which is not closed are limited and form interlocking, and when the closed switching electric appliance (300) is reset, the springs (120) can drive the two interlocking pieces (110) to reset and release the interlocking.

2. The mechanical interlock device of switching apparatus according to claim 1, wherein: the two interlocking pieces (110) are identical in structure and symmetrically arranged, the two interlocking pieces (110) respectively comprise a pivot part (111), a spring part (112) and a driving part which are respectively arranged on two sides of the pivot part (111), the driving part comprises a linkage part (113) and a locking part (114) which are arranged in a stacked mode, the pivot parts (111) of the two interlocking pieces (110) are respectively installed in a shell of the interlocking mechanism (100) in a pivoted mode, the sides, provided with the locking parts (114), of the linkage parts (113) of the two interlocking pieces (110) are oppositely arranged, the locking parts (114) of the two interlocking pieces (110) are located between the two linkage parts (113), linkage shafts (115) are respectively arranged on the sides, far away from the locking parts (114), of the linkage parts (113) of the two interlocking pieces (110), and elongated avoidance holes (14) for avoiding the linkage shafts (115) are respectively arranged on the two half shells (130), the two linkage shafts (115) respectively penetrate through the avoidance holes (14) to be connected with the contact supports (310) of the switch electric appliances (300) corresponding to the two sides, and the spring parts (112) of the two interlocking pieces (110) are connected through the springs (120).

3. The mechanical interlock device of switching apparatus according to claim 2, characterized in that: the locking parts (114) of the interlocking pieces (110) are fan-shaped, the middle of the arc surface of each locking part (114) is provided with a locking protrusion (116), one side of each locking protrusion (116) is provided with a locking groove (117), the locking protrusions (116) on the locking parts (114) of the two interlocking pieces (110) are arranged oppositely, and when the switching electric appliance (300) is closed, the corresponding interlocking pieces (110) are driven to rotate, so that the locking protrusions (116) of the locking parts (114) on the interlocking pieces (110) slide into the locking grooves (117) on the locking parts (114) on the other interlocking pieces (110) to prevent the interlocking pieces (110) from rotating downwards.

4. The mechanical interlock device of switching apparatus according to claim 1, wherein: the interlocking device is characterized by further comprising a connecting piece (200) arranged below the interlocking mechanism (100), two sides of the connecting piece (200) are connected with shells of two switching devices (300) respectively, the top surface of the connecting piece (200) is in limit fit with the interlocking mechanism (100), two oppositely-arranged positioning bosses (210) are arranged on the bottom surface of the connecting piece (200), a yielding groove (220) is formed in the position, corresponding to the bottom surface of the connecting piece (200), between the two positioning bosses (210), the two positioning bosses (210) of the connecting piece (200) are used for limiting a bottom plate (410) or a guide rail (420) on the bottom plate (410) respectively, and the yielding groove (220) is used for yielding a screw (430) which is arranged on the guide rail (420) and used for connecting the.

5. The mechanical interlock device of switching apparatus according to claim 4, wherein: the connecting piece (200) is of a flat box-shaped structure perpendicular to the bottom plate (410), and the bottom surface of the connecting piece (200) is downward opened.

6. The mechanical interlock device of switching apparatus according to claim 4, wherein: the cross-section of guide rail (420) becomes U font structure, guide rail (420) include side guide portion (421) of two relative settings, and connect bottom guide portion (422) between two side guide portion (421) bottoms, the outside on two side guide portion (421) tops is equipped with horizontal guide portion (423) respectively, enclose into the guide way between side guide portion (421) and bottom guide portion (422) that two relative settings, be equipped with screw hole (424) on bottom guide portion (422), screw (430) pass screw hole (424) and be connected with bottom plate (410), the casing bottom of switching apparatus (300) is equipped with cover spacing draw-in groove (330) on two horizontal guide portion (423) of guide rail (420).

7. The mechanical interlock device of switching apparatus according to claim 6, wherein: the height of the positioning boss (210) is not higher than the depth of the guide groove, so that two sides of the connecting piece (200) are positioned in the guide groove and are respectively in limit fit with the two side guide parts (421).

8. The mechanical interlock device of switching apparatus according to claim 4, wherein: the middle of the top side of the connecting piece (200) is provided with a top plate boss (204), and the bottom side of the shell of the interlocking mechanism (100) is provided with a top plate groove (2040) matched with the top plate boss (204).

9. The mechanical interlock device of switching apparatus according to claim 4, wherein: the connecting piece (200) comprises two oppositely arranged clamping plates (201), two side plates (202) respectively connected between one ends of the two clamping plates (201), and a top plate (203) connected between the two clamping plates (201) and the top ends of the two side plates (202), two limiting parts (230) connected with the shells of the corresponding switch appliances (300) are respectively arranged on the outer sides of the two clamping plates (201), and two limiting grooves (2300) in limiting fit with the corresponding limiting parts (230) are arranged on the shells of the two switch appliances (300); the bottom surfaces of the two clamping plates (201) are respectively provided with two oppositely arranged positioning bosses (210), and abdicating grooves (220) are respectively arranged between the two positioning bosses (210) corresponding to the bottom surfaces of the two clamping plates (201); the limiting piece (230) is a long strip-shaped structure which is arranged in parallel to the height direction of the connecting piece (200), the width of the limiting piece (230) is gradually increased along the direction away from the clamping plate (201), the bottom end of a limiting groove (2300) on the shell of the switch electric appliance (300) is opened downwards, and the inner diameter of the limiting groove (2300) is gradually contracted from inside to outside.

10. The mechanical interlock device of switching apparatus according to claim 1, wherein: the outer side of the shell of the interlocking mechanism (100) is provided with an insertion boss (150), and the outer side of the shell of the switching electric appliance (300) is provided with two insertion grooves (1500) matched with the two insertion bosses (150).

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