Preventive trolley ground knife interlocking device

Abstract

The present invention relates to a preventive trolley grounding knife interlocking device. It includes a shell, a grounding operation shaft and a grounding operation hole. A partition is fixedly provided in the shell, an upper guide rail is fixedly provided above the partition, an opening is provided on the upper guide rail, an interlocking plate is provided on the partition, the interlocking plate is rotatably connected to the partition through a rotating shaft extending along the front-back direction, and an upper end of the interlocking plate is provided with a pushing protrusion that can extend into the opening in a working state or exit an idle state outside the opening during the rotation around the rotating shaft; it also includes an opening and closing component, a synchronization component, a locking component, an unlocking component, a retaining component and an interlocking reset component. After each grounding switch operation of the present invention, the grounding operation hole will automatically close to prevent the occurrence of misoperation, and when the grounding switch is in the closing position, the circuit breaker cannot enter the working position from the test position, realizing the anti-misclosing circuit breaker function among the five protections, and the mechanical transmission has strong reliability and is not prone to deformation of components.

Description

Technical Field

[0001] The invention relates to the technical field of switch cabinets, in particular to a preventive trolley ground knife interlocking device. Background Art

[0002] The switch cabinet grounding room mainly includes the cabinet, the grounding knife (i.e., grounding switch) installed in the cabinet, and the grounding operating shaft used to control the closing and opening of the grounding switch. To ensure safety, the switch cabinet is required to have a reliable anti-misclosing circuit breaker function, that is, when the grounding switch is in the closed state, the circuit breaker trolley in the test position cannot be operated to move to the working position. Only when the grounding switch is in the open state can the circuit breaker trolley be controlled to move to the working area.

[0003] At present, the following solutions are mainly used to deal with the problem of preventing accidental closing and circuit breaking:

[0004] 1. Manual control, high risk and poor reliability;

[0005] 2. Use passive anti-misoperation method, that is, force limit to prevent operation in the middle of misoperation. Passive forced limit interlocking will cause great damage to the limit parts and easily cause deformation of the grounding operating rod. Summary of the invention

[0006] The purpose of the present invention is to overcome the above shortcomings and provide a preventive trolley grounding knife interlocking device. After each grounding switch operation, the grounding operation hole will be automatically closed to prevent the occurrence of misoperation. When the grounding switch is in the closed position, the circuit breaker cannot enter the working position from the test position, thereby realizing the anti-misclosing circuit breaker function among the five protections. In addition, the mechanical transmission has strong reliability and is not prone to deformation of components.

[0007] The present invention is implemented by the following technical solutions: A preventive trolley ground switch interlocking device comprises a housing, a grounding operating shaft extending in the front-rear direction of the housing and used to control the opening or closing of a grounding switch during the rotation process is rotatably connected in the housing, and a grounding operating hole for conveniently connecting and controlling the rotation of the grounding operating shaft is provided on the front side wall of the housing;

[0008] The invention is characterized in that: a partition plate is fixedly provided in the shell body and the operating shaft is vertically connected to the ground, an upper guide rail is fixedly provided above the partition plate and extends in the front-to-back direction, the upper guide rail is provided with an opening connecting the left and right side walls thereof, an interlocking plate is provided on the partition plate, the interlocking plate is rotatably connected to the partition plate through a rotating shaft extending in the front-to-back direction, and an upper end portion of the interlocking plate is provided with a pushing protrusion which can be extended into the opening in the working state or withdrawn from the opening in the idle state during the rotation process around the rotating shaft;

[0009] The preventive trolley ground knife interlocking device also includes an opening and closing component arranged on the shell body for controlling the conversion of the grounding operation hole between the open and closed states, a synchronization component arranged between the opening and closing component and the interlocking plate for following the movement of the opening and closing component to push the interlocking plate from the idle state to the working state when the opening and closing component enters the open state from the closed grounding operation hole state, a locking component connected between the opening and closing component and the shell body for locking the open state position of the opening and closing component, an unlocking component connected between the locking component and the grounding operation shaft for releasing the locking condition of the opening and closing component by the locking component during the rotation of the grounding operation shaft, a holding component connected between the grounding operation shaft and the interlocking plate for keeping the interlocking plate in the working state or releasing the holding effect on the working state of the interlocking plate when the locking component unlocks the opening and closing component, and an interlocking reset component connected between the shell body and the interlocking plate for driving the interlocking plate to reset from the working state to the idle state.

[0010] In order to better implement this plan, the following optimization solutions are also provided:

[0011] In order to facilitate the control of the opening and closing of the grounding operating hole, the opening and closing assembly includes an operating shaft and a cover plate. The operating shaft is arranged parallel to the grounding operating shaft and is rotatably connected in the shell. One axial end of the operating shaft extends out of the front side wall of the shell and is located beside the grounding operating hole. The cover plate is eccentrically fixed on the operating shaft and can switch between the two states of opening and closing the grounding operating hole during the rotation of the operating shaft.

[0012] In order to facilitate the resetting of the operating shaft, the opening and closing assembly also includes an operating torsion spring which is sleeved on the outer periphery of the operating shaft and has two ends acting between the shell and the operating shaft to provide a reverse force for resetting the operating shaft from the open state to the closed state.

[0013] In order to facilitate the operation of the interlocking plate, the synchronization component is an operating frame eccentrically installed on the operating shaft and located below the interlocking plate. The operating frame is fixed with a pushing component that presses against the lower side of the interlocking plate. The pushing component can push the interlocking plate to rotate around its axis until the pushing protrusion enters the opening during the process of following the rotation of the operating shaft.

[0014] In order to facilitate locking the open state, the partition is provided with a linear guide groove extending vertically and passing through its front and rear side walls. The locking assembly includes a first rod body extending in the front and rear directions and movably arranged in the linear guide groove and can move up and down relative to the linear guide groove, a second rod body vertically fixedly connected to one end of the first rod body and movably connected to the partition up and down, a return spring connected between the partition and the second rod body for providing a downward force for the second rod body, and a rotating body fixedly installed on the operating shaft. Under the action of the return spring, the bottom of the first rod body contacts the outer peripheral wall of the rotating body, and the outer peripheral wall of the rotating body is provided with a groove. When the opening and closing assembly is in the open state, the first rod body is stuck in the groove under the action of the return spring to limit the rotation of the operating shaft.

[0015] In order to facilitate the release of the open state, the unlocking assembly includes a third rod body fixedly arranged at the lower end of the second rod body and extending in the left and right directions, and a reset cam fixedly installed on the grounding operating shaft and located below the third rod body. When the reset cam rotates to the maximum rising stroke position of its convex portion pushing the third rod body upward, it can push the first rod body upward to break away from the restriction of the groove.

[0016] In order to facilitate maintaining the working state of the interlocking plate, an interlocking pin extending in the front-to-back direction is also fixed on the interlocking plate. The retaining assembly includes an L-shaped transmission block slidably connected to the partition plate up and down, a compression spring connected between the L-shaped transmission block and the partition plate for providing a force to move the L-shaped transmission block downward, and a locking cam fixedly installed on the operating shaft and located below the L-shaped transmission block. The cross bar portion of the L-shaped transmission block extends in the left-right direction and is hooked under the interlocking pin, and when the convex portion of the locking cam pushes the L-shaped transmission block to rise to the maximum stroke position, the interlocking plate remains in the working state, wherein the line connecting the convex vertex of the locking cam and the center of the operating shaft and the line connecting the convex vertex of the reset cam and the center of the operating shaft are set at a 90° angle, so that the two cams can move alternately.

[0017] In order to facilitate the control of the rotation of the operating shaft, an operating handle is also provided at the end of the operating shaft extending out of the housing.

[0018] In order to prevent the ground switch from being closed under power, the shell is also provided with an electromagnetic lock for locking the cover plate to prevent it from rotating. The electromagnetic lock includes a main body fixedly installed in the shell, an iron core arranged in the main body and capable of telescopic movement forward and backward relative to the main body, a circular stop fixed at the front end of the iron core and located above the cover plate, and an electromagnet for controlling the extension and retraction of the iron core according to the power supply condition.

[0019] Preferably, the interlock reset component is an interlock reset torsion spring which is sleeved on the outer periphery of the rotating shaft and has two ends acting on the housing and the interlock plate respectively.

[0020] Compared with the previous technology, the beneficial effects of the present invention are:

[0021] 1. The present invention discloses a preventive trolley grounding knife interlocking device. After each grounding switch operation, the grounding operation hole will be automatically closed to prevent the occurrence of misoperation. When the grounding switch is in the closing position, the circuit breaker cannot enter the working position from the test position, thereby realizing the anti-misclosing circuit breaker function among the five protections. In addition, the mechanical transmission has strong reliability and is not prone to deformation of components.

[0022] 2. In the present invention, when the circuit breaker trolley is in the working position, the grounding operation hole cannot be opened at all times, thereby preventing the occurrence of misoperation.

[0023] 3. The present invention is also provided with an electromagnetic lock, which can lock the cover plate when the cable end is energized, and the grounding operation hole is also in a closed state, effectively preventing the grounding switch from being closed when the cable end is energized. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0025] Figure 2 A side view of an embodiment of the present invention;

[0026] Figure 3 It is a partial structural schematic diagram of the opening and closing assembly in an embodiment of the present invention;

[0027] Figure 4 This is a front view of the operating handle starting to rotate in the embodiment of the present invention;

[0028] Figure 5 for Figure 4 Sectional view of AA in the middle;

[0029] Figure 6 for Figure 4 Cross-sectional view of the middle BB;

[0030] Figure 7 A side view of the operating handle starting to rotate in the embodiment of the present invention;

[0031] Figure 8 This is a schematic diagram of the use state of the grounding operation hole in the embodiment of the present invention being in an open state;

[0032] Fig. 9 This is a schematic diagram of a use state in which the locking state of the operating shaft is released in an embodiment of the present invention;

[0033] Fig.10 It is a schematic diagram of the use state of the grounding knife being closed and the operating handle being reset in the embodiment of the present invention;

[0034] Fig.11 Schematic diagram of the structure of each rod body in the embodiment of the present invention;

[0035] Fig.12It is a schematic diagram of the structure of the operating frame and the rotating body in an embodiment of the present invention;

[0036] Fig.13 The interlocking diagram of the embodiment of the present invention when the cable end is energized Figure 1 ;

[0037] Fig.14 The interlocking diagram of the embodiment of the present invention when the cable end is energized Figure 2 ;

[0038] Fig.15 A schematic diagram of a use state of an embodiment of the present invention;

[0039] Fig.16 The figure is a schematic diagram of the interlocking between the embodiment of the present invention and the circuit breaker trolley.

[0040] Explanation of reference numerals: 1-housing, 11-partition, 12-upper guide rail, 13-opening, 14-linear guide groove, 2-grounding operating shaft, 21-grounding operating hole, 3-interlocking plate, 31-rotating shaft, 32-interlocking pin, 4-opening and closing assembly, 41-operating rotating shaft, 42-cover plate, 43-operating torsion spring, 44-operating handle, 5-synchronizing component, 51-pushing component, 6-locking assembly, 61-first rod body, 62-second rod body, 63-reset spring, 64-rotating body, 641-groove, 7-unlocking assembly, 71-third rod body, 72-reset cam, 8-holding assembly, 81-L-shaped transmission block, 811-cross bar, 82-compression spring, 83-locking cam, 9-interlocking reset component, a-electromagnetic lock, a1-body, a2-iron core, a3-round block, b1-chassis vehicle lock plate, b2-operating hole lock plate. DETAILED DESCRIPTION

[0041] The present invention is described in detail below in conjunction with the accompanying drawings:

[0042] like Figure 1-16 As shown, a preventive trolley ground switch interlocking device comprises a housing 1, in which a grounding operation shaft 2 extending in the front-to-back direction of the housing 1 and used to control the opening or closing of the grounding switch during the rotation process is rotatably connected, and a grounding operation hole 21 for conveniently connecting and controlling the rotation of the grounding operation shaft 2 is provided on the front side wall of the housing 1;

[0043] A partition 11 extending in the vertical direction perpendicular to the grounded operating shaft 2 is fixedly provided in the housing 1, an upper guide rail 12 extending in the front-to-back direction is fixedly provided above the partition 11, and an opening 13 connecting the left and right side walls thereof is provided on the upper guide rail 12, and an interlocking plate 3 is provided on the partition 11, and the interlocking plate 3 is rotatably connected to the partition 11 via a rotating shaft 31 extending in the front-to-back direction, and a pushing protrusion is provided on the upper end of the interlocking plate 3, which can be extended into the opening 13 in a working state or withdrawn from the opening 13 in an idle state during the rotation process around the rotating shaft 31;

[0044] The preventive trolley ground knife interlocking device also includes an opening and closing component 4 arranged on the shell 1 for controlling the conversion of the grounding operation hole 21 between the open and closed states, a synchronization component 5 arranged between the opening and closing component 4 and the interlocking plate 3 for following the movement of the opening and closing component 4 to push the interlocking plate 3 from the idle state to the working state when the opening and closing component 4 enters the open state from the closed grounding operation hole 21 state, a locking component 6 connected between the opening and closing component 4 and the shell 1 for locking the open state position of the opening and closing component 4, an unlocking component 7 connected between the locking component 6 and the grounding operation shaft 2 for releasing the locking condition of the opening and closing component 4 by the locking component 6 during the rotation of the grounding operation shaft 2, a holding component 8 connected between the grounding operation shaft 2 and the interlocking plate 3 for keeping the interlocking plate 3 in the working state or releasing the holding effect on the working state of the interlocking plate 3 when the locking component 6 releases the locking of the opening and closing component 4, and an interlocking reset component 9 connected between the shell 1 and the interlocking plate 3 for driving the interlocking plate 3 to reset from the working state to the idle state.

[0045] like Figure 1-5 As shown, in order to facilitate the control of the opening and closing of the grounding operating hole, the opening and closing component 4 includes an operating shaft 41 and a cover plate 42. The operating shaft 41 is arranged parallel to the grounding operating shaft 2 and is rotatably connected in the shell 1. One axial end of the operating shaft 41 extends out of the front side wall of the shell 1 and is located beside the grounding operating hole 21. The cover plate 42 is eccentrically fixed on the operating shaft 41 and can switch between the two states of opening and closing the grounding operating hole 21 during the rotation of the operating shaft 41.

[0046] like Figure 1 As shown, in order to facilitate the resetting of the operating shaft, the opening and closing assembly 4 also includes an operating torsion spring 43 which is sleeved on the outer periphery of the operating shaft 41 and has two ends acting between the shell 1 and the operating shaft 41 to provide a reverse force for resetting the operating shaft 41 from the open state to the closed state.

[0047] For the sake of Figure 4-6As shown in 12, it is convenient to push the interlocking plate to work. The synchronization component 5 is an operating frame eccentrically installed on the operating shaft 41 and located below the interlocking plate 3. The operating frame is fixed with a pushing component 51 that presses on the lower side of the interlocking plate 3. The pushing component 51 can push the interlocking plate 3 to rotate around its shaft 31 until the pushing protrusion enters the opening 13 during the process of following the rotation of the operating shaft 41.

[0048] like Figure 4-6 , 12. In order to facilitate locking the open state, a linear guide groove 14 extending vertically and penetrating the front and rear side walls thereof is provided on the partition 11. The locking assembly 6 includes a first rod body 61 extending along the front and rear directions and movably arranged in the linear guide groove 14 and capable of moving up and down relative to the linear guide groove 14, a second rod body 62 vertically fixedly connected to one end of the first rod body 61 and movably connected to the partition 11 up and down, a return spring 63 connected between the partition 11 and the second rod body 62 for providing a downward force for the second rod body 62, and a rotating body 64 fixedly installed on the operating shaft 41. Under the action of the return spring 63, the bottom of the first rod body 61 contacts the outer peripheral wall of the rotating body 64, and the outer peripheral wall of the rotating body 64 is provided with a groove 641. When the opening and closing assembly 4 is in the open state, the first rod body 61 is stuck in the groove 641 under the action of the return spring 63 to limit the rotation of the operating shaft 41.

[0049] like Fig. 9 As shown, in order to facilitate the release of the open state, the unlocking assembly 7 includes a third rod 71 fixedly arranged at the lower end of the second rod 62 and extending in the left and right directions, and a reset cam 72 fixedly installed on the grounding operating shaft 2 and located below the third rod 71. When the reset cam 72 rotates to the maximum rising stroke position where its convex portion pushes the third rod 71 upward, it can push the first rod 61 upward to break away from the restriction of the groove 641.

[0050] like Fig. 9 As shown, in order to facilitate maintaining the working state of the interlocking plate, an interlocking pin 32 extending in the front-to-back direction is also fixed on the interlocking plate 3, and the retaining assembly 8 includes an L-shaped transmission block 81 slidably connected to the partition 11 up and down, a compression spring 82 connected between the L-shaped transmission block 81 and the partition 11 for providing a force to move the L-shaped transmission block 81 downward, and a locking cam 83 fixedly mounted on the operating shaft 2 and located below the L-shaped transmission block 81, the cross bar portion 811 of the L-shaped transmission block 81 extends in the left-right direction and is hooked under the interlocking pin 32, and when the convex portion of the locking cam 83 pushes the L-shaped transmission block 81 to rise to the maximum stroke position, the interlocking plate 3 remains in the working state, wherein the line connecting the convex vertex of the locking cam 83 and the center of the operating shaft 2 and the line connecting the convex vertex of the reset cam 72 and the center of the operating shaft 2 are set at a 90° angle, so that the two cams can move alternately.

[0051] like Figure 1 , 3 As shown, in order to facilitate the control of the rotation of the operating shaft, an operating handle 44 is further provided at the end of the operating shaft 41 extending out of the housing 1 .

[0052] like Figure 13-14 As shown, in order to prevent the ground switch from being closed while energized, the shell 1 is also provided with an electromagnetic lock a for locking the cover plate 42 to prevent it from rotating. The electromagnetic lock a includes a main body a1 fixedly installed in the shell 1, an iron core a2 arranged in the main body a1 and capable of telescopic movement forward and backward relative to the main body a1, a round stopper a3 fixedly arranged at the front end of the iron core a2 and located above the cover plate 42, and an electromagnet for controlling the extension and retraction of the iron core a2 according to the energized state.

[0053] Preferably, the interlocking reset component 9 is an interlocking reset torsion spring which is sleeved on the outer periphery of the rotating shaft 31 and has two ends acting on the housing 1 and the interlocking plate 3 respectively.

[0054] The working principle and process of this embodiment are as follows:

[0055] 1. Preventing the circuit breaker from being closed by mistake

[0056] 1. If Figure 5 , 7 As shown in FIG. 8 , hold the operating handle 44 to rotate the operating shaft 41 90 degrees counterclockwise. The rotating body 64 installed on the operating shaft 41 pushes up the first rod body 61. When the first rod body 61 reaches the highest point of the arc edge of the rotating body 64, it slides into the groove 641 of the rotating body 64 under the action of the return spring 63, the operating shaft 41 is locked, the cover plate 42 leaves the grounding operation hole 21, and the grounding operation hole 21 is exposed;

[0057] 2. If Figure 5 , 8 As shown, when the operating shaft 41 is rotated, the pushing component 51 of the synchronization component 5 (i.e., the operating frame) pushes the interlocking plate 3 to overcome the interlocking reset component 9 (i.e., the interlocking reset torsion spring), so that the interlocking plate 3 rotates counterclockwise around the shaft 3, and the upper end of the interlocking plate 3 protrudes from the opening 13 of the upper guide rail 12;

[0058] 3. If Fig. 9 As shown, insert the grounding operation handle (not shown) into the grounding operation hole 21, so that the grounding operation shaft 2 rotates clockwise. When rotating 90 degrees, the reset cam 72 pushes the third rod body 71 to the highest point. The rotating body 61 rotates clockwise under the action of the operating torsion spring 43, and the first rod body 61 exits the groove 641 and contacts its arc edge. The lower edge of the cover plate 42 rests on the grounding operation handle;

[0059] 4. When the grounding operation shaft 2 rotates, the locking cam 83 rotates at the same time. The L-shaped transmission block 81 lifted by the locking cam 83 overcomes the compression spring 82 and rises. When the locking cam 83 rotates 90 degrees, the L-shaped transmission block 81 rises to the highest point and just touches the interlocking pin 32, locking the interlocking plate 3 to keep it in working state;

[0060] 5. If Fig.10 As shown, continue to turn the grounding operating handle clockwise to 180 degrees, and the grounding switch is closed. The locking cam 83 keeps the highest point in contact with the L-shaped transmission block, and the reset cam 72 rotates to the lowest point;

[0061] 6. When the grounding operation handle is removed from the grounding operation hole 21, the operation shaft 41 returns to the initial state under the action of the operation torsion spring 43, covering the grounding operation hole 21;

[0062] 7. After the operating shaft 41 is reset, the first rod 61 returns to its initial position under the action of the reset spring 63;

[0063] 8. If Fig.15 As shown, since the interlocking plate 3 protrudes from the guide rail surface C (i.e., extends out of the opening 13), the chassis lock plate b1 of the circuit breaker is pushed to the right by a certain distance, the circuit breaker chassis is locked, and the circuit breaker cannot move from the test position to the working position, thereby realizing the function of preventing the circuit breaker from being closed accidentally in the high-voltage switch cabinet.

[0064] 2. Interlocking of circuit breaker trolley

[0065] like Fig.16 As shown, when the circuit breaker trolley is in the working position, the operating handle 44 is rotated counterclockwise, and the operating handle 44 drives the interlocking plate 3 to rotate. Since the circuit breaker trolley is in the working position, the operating hole lock plate b2 on the circuit breaker chassis blocks the rotation of the interlocking plate 3, so that the operating handle 44 cannot rotate, and the cover plate 42 keeps blocking the grounding operating hole 21;

[0066] 3. Interlocking when the cable end is energized (such as Figure 13-14 (shown)

[0067] 1. When reverse power supply occurs, when the cable end is energized, the electromagnet loses power and the iron core pops out;

[0068] 2. The round stopper a3 installed on the electromagnet core stops above the cover plate 42;

[0069] 3. When the operating handle 44 is rotated counterclockwise, the cover plate 42 is blocked by the round stop a3 above, so that the operating handle 44 cannot be rotated and the grounding operating hole is in a closed state, which effectively prevents the occurrence of a dangerous situation of a live grounding knife.

[0070] Although the present invention is illustrated and described by specific embodiments and their alternatives, it should be understood that various changes and modifications within the spirit and scope of the present invention can be implemented. Therefore, it should be understood that the present invention is not limited in any sense except by the limitations of the attached claims and their equivalents.

Claims

1. A preventive trolley ground switch interlocking device, comprising a housing (1), a grounding operating shaft (2) extending in the front-rear direction of the housing (1) and used to control the opening or closing of a grounding switch during rotation, being rotatably connected in the housing (1), and a grounding operating hole (21) for conveniently connecting and controlling the rotation of the grounding operating shaft (2) is provided on the front side wall of the housing (1); Features: A partition (11) is fixedly provided in the housing (1) and is vertically connected to the grounded operating shaft (2). An upper guide rail (12) is fixedly provided above the partition (11) and is extended in the front-to-back direction. The upper guide rail (12) is provided with an opening (13) connecting the left and right side walls thereof. An interlocking plate (3) is provided on the partition (11). The interlocking plate (3) is rotatably connected to the partition (11) via a rotating shaft (31) extending in the front-to-back direction. An upper end portion of the interlocking plate (3) is provided with a pushing protrusion that can be extended into the opening (13) to enter a working state or withdraw from the opening (13) to enter an idle state during rotation around the rotating shaft (31). The preventive trolley ground knife interlocking device also includes an opening and closing component (4) arranged on the housing (1) for controlling the grounding operation hole (21) to switch between an open state and a closed state, a synchronization component (5) arranged between the opening and closing component (4) and the interlocking plate (3) for following the movement of the opening and closing component (4) to push the interlocking plate (3) from an idle state to an operating state when the opening and closing component (4) changes from a closed grounding operation hole (21) state to an open state, a locking component (6) connected between the opening and closing component (4) and the housing (1) for locking the opening and closing component (4) in the open state position, and a locking component (7) connected to the locking component (8) for locking the opening and closing component (4) in the open state position. An unlocking component (7) is connected between the fixed component (6) and the grounding operating shaft (2) and is used to release the locking condition of the opening and closing component (4) by the locking component (6) during the rotation of the grounding operating shaft (2); a retaining component (8) is connected between the grounding operating shaft (2) and the interlocking plate (3) and is used to keep the interlocking plate (3) in a working state or release the retaining effect on the working state of the interlocking plate (3) when the locking component (6) releases the locking condition of the opening and closing component (4); and an interlocking resetting component (9) is connected between the housing (1) and the interlocking plate (3) and is used to drive the interlocking plate (3) to reset from a working state to an idle state; The opening and closing assembly (4) comprises an operating shaft (41) and a cover plate (42); the operating shaft (41) is arranged parallel to the grounding operating shaft (2) and is rotatably connected in the housing (1); one axial end of the operating shaft (41) extends out of the front side wall of the housing (1) and is located beside the grounding operating hole (21); the cover plate (42) is eccentrically fixed on the operating shaft (41) and can switch between two states of opening and closing the grounding operating hole (21) during the rotation of the operating shaft (41); The synchronizing component (5) is an operating frame eccentrically mounted on the operating shaft (41) and located below the interlocking plate (3). A pushing component (51) is fixedly provided on the operating frame and is pressed against the lower side of the interlocking plate (3). The pushing component (51) can push the interlocking plate (3) to rotate around its shaft (31) until the pushing protrusion enters the opening (13) during the process of following the rotation of the operating shaft (41).

2. The preventive trolley ground cutter interlocking device according to claim 1 is characterized in that: The opening and closing assembly (4) further comprises an operating torsion spring (43) which is sleeved on the outer circumference of the operating rotating shaft (41) and has two ends acting between the housing (1) and the operating rotating shaft (41) and is used to provide a reverse force for returning the operating rotating shaft (41) from an open state to a closed state.

3. The preventive trolley ground cutter interlocking device according to claim 1 is characterized in that: The partition (11) is provided with a linear guide groove (14) extending vertically and penetrating the front and rear side walls thereof, and the locking assembly (6) comprises a first rod (61) extending in the front-rear direction and movably passing through the linear guide groove (14) and being able to move up and down relative to the linear guide groove (14), a second rod (62) vertically fixedly connected to one end of the first rod (61) and movably connected to the partition (11) up and down, and a second rod (62) connected between the partition (11) and the second rod (62) for providing the second rod (62) with a downward movement. A return spring (63) for exerting force, and a rotating body (64) fixedly mounted on the operating shaft (41); the bottom of the first rod body (61) contacts the outer peripheral wall of the rotating body (64) under the action of the return spring (63); and the outer peripheral wall of the rotating body (64) is provided with a groove (641); when the opening and closing assembly (4) is in an open state, the first rod body (61) is clamped in the groove (641) under the action of the return spring (63) to limit the rotation of the operating shaft (41).

4. The preventive trolley ground cutter interlocking device according to claim 3 is characterized in that: The unlocking assembly (7) comprises a third rod (71) fixedly arranged at the lower end of the second rod (62) and extending in the left-right direction, and a reset cam (72) fixedly mounted on the grounding operation shaft (2) and located below the third rod (71); when the reset cam (72) rotates to a maximum ascending stroke position where its convex portion pushes the third rod (71) upward, it can push the first rod (61) upward to break away from the restriction of the groove (641).

5. The preventive trolley ground cutter interlocking device according to claim 4 is characterized in that: The interlocking plate (3) is also provided with an interlocking pin (32) extending in the front-to-back direction. The retaining assembly (8) comprises an L-shaped transmission block (81) slidably connected to the partition plate (11) in an up-and-down manner, a compression spring (82) connected between the L-shaped transmission block (81) and the partition plate (11) for providing a force for moving the L-shaped transmission block (81) downward, and a locking cam (83) fixedly mounted on the operating shaft (2) and located below the L-shaped transmission block (81). The crossbar portion (811) of the L-shaped transmission block (81) extends in the left-right direction and is hooked below the interlocking pin (32). When the convex portion of the locking cam (83) pushes the L-shaped transmission block (81) to rise to the maximum stroke position, the interlocking plate (3) remains in the working state. The line connecting the convex portion vertex of the locking cam (83) and the center of the operating shaft (2) and the line connecting the convex portion vertex of the reset cam (72) and the center of the operating shaft (2) are arranged at an angle of 90°, so that the two cams can move alternately.

6. The preventive trolley ground cutter interlocking device according to claim 1 is characterized in that: An operating handle (44) is also provided at the end of the operating shaft (41) extending out of the housing (1).

7. The preventive trolley ground cutter interlocking device according to claim 1 is characterized in that: The housing (1) is also provided with an electromagnetic lock (a) for locking the cover plate (42) to prevent the cover plate (42) from rotating. The electromagnetic lock (a) comprises a body (a1) fixedly mounted in the housing (1), an iron core (a2) disposed in the body (a1) and capable of telescopic movement forward and backward relative to the body (a1), a round stop (a3) ​​fixedly disposed at the front end of the iron core (a2) and located above the cover plate (42), and an electromagnet for controlling the extension and retraction of the iron core (a2) according to a charged state.

8. The preventive trolley ground cutter interlocking device according to claim 1 is characterized in that: The interlocking reset component (9) is an interlocking reset torsion spring which is sleeved on the outer circumference of the rotating shaft (31) and has two ends acting on the housing (1) and the interlocking plate (3) respectively.

Images