Interlocking device and method for handcart and grounding switch

Abstract

The invention relates to the technical field of handcart cabinets, in particular to an interlocking device and method for a handcart and a grounding switch, and the device comprises a grounding knife switch opening and closing control unit which is connected with a grounding knife switch, and a circuit breaker access control unit which is arranged at one side of a circuit breaker positioning plate. The grounding knife switch opening and closing control unit comprises an interlocking small valve and a knife switch control mechanism. The circuit breaker access control unit comprises an interlocking rod, a plugging control mechanism and a plugging plate. The circuit breaker access control unit is connected with the small interlocking valve, and the control of the access of the circuit breaker handcart is realized by controlling the plugging plate to be close to or far away from the circuit breaker positioning plate; meanwhile, when the disconnecting link control mechanism is used for controlling the grounding disconnecting link, an interlocking small valve needs to be moved, so that control over opening and closing of the grounding disconnecting link and interlocking of blocking of a circuit breaker positioning plate are achieved, and therefore the five-prevention requirement of a circuit breaker chamber is met; meanwhile, the overall structure is simple, cost is low, working reliability is improved, and use safety and reliability are guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of trolley cabinets, and in particular to an interlocking device and method for a trolley and a grounding switch. Background Art

[0002] The interlocking mechanism between the circuit breaker trolley and the grounding switch is designed to meet the "five protections" requirement of the circuit breaker room, namely "preventing the grounding switch and circuit breaker from being opened or closed by mistake". Its function is as follows: the circuit breaker trolley can be moved from the test position to the working position only when the grounding switch is in the open state, and the circuit breaker trolley cannot move when the grounding switch is in the closed state; the grounding switch cannot be closed when the circuit breaker trolley is in the working position, and the grounding switch can be opened or closed only when the circuit breaker trolley is in the test position, so as to effectively prevent misoperation.

[0003] For example, the Chinese invention patent application with application number 202210337859.6 provides an interlocking device and a trolley cabinet for a circuit breaker trolley and an earthing switch, which realizes the interlocking between the circuit breaker trolley and the earthing switch. However, its structure is complex and costly, and it is not easy to maintain and repair, which reduces the reliability of the interlocking operation. In addition, during actual operation, it is difficult to control the rotation angle of the operating shaft. If the rotation angle is too large, it is easy to cause structural deformation, reduce the service life, further reduce the interlocking reliability, and cannot meet actual use requirements. Summary of the invention

[0004] The purpose of the present invention is to provide an interlocking device and method for a trolley and an earthing switch, so as to solve the technical problem that the current interlocking device has a complex structure and low reliability.

[0005] The present invention solves the above-mentioned technical problems by: An interlocking device for a trolley and an earthing switch, comprising an earthing knife opening and closing control unit connected to an earthing knife switch and a circuit breaker access control unit arranged on one side of a circuit breaker positioning plate; the earthing knife opening and closing control unit comprises an interlocking small valve and a knife switch control mechanism, and the circuit breaker access control unit comprises a locking rod, a blocking control mechanism and a blocking plate; The interlocking small valve is arranged on the outside of one end of the knife switch control mechanism, and the other end of the knife switch control mechanism is connected to the grounding knife switch; one end of the chain rod is connected to the interlocking small valve, and the sliding directions of the chain rod and the interlocking small valve are arranged in the same direction, and the other end of the chain rod is connected to one end of the blocking plate through the blocking control mechanism, and the other end of the blocking plate faces the circuit breaker positioning plate, and the interlocking small valve slides through the chain rod and the blocking control mechanism to drive the blocking plate to approach or move away from the circuit breaker positioning plate.

[0006] It is further defined that the knife switch control mechanism includes a limit support, a first limit plate and a ground knife rotating shaft; The limit support is sleeved on the outer side of the ground cutter shaft, one end of the limit support is close to the interlocking small valve, and the other end of the limit support is close to the first limit plate, and the first limit plate is sleeved on the ground cutter shaft and connected to the ground cutter shaft; A limiting block is arranged at the other end of the limiting support, and a limiting opening is arranged on the first limiting plate. The limiting block contacts both sides of the limiting opening to limit the rotation angle of the first limiting plate driven by the ground cutter shaft.

[0007] It is further defined that the rotation angle of the ground cutter shaft is °.

[0008] It is further defined that the end portion corresponding to the grounding knife rotating shaft is transmission connected to the grounding knife switch through a bevel gear set.

[0009] It is further defined that the knife switch control mechanism also includes a second limit plate, which is sleeved on the ground knife rotating shaft and connected to the ground knife rotating shaft. The ground knife rotating shaft drives the second limit plate to rotate to limit the interlocking small valve.

[0010] It is further defined that the interlocking small valve and the locking rod are both vertically arranged, and the vertical reciprocating movement of the locking rod drives the blocking plate to move horizontally reciprocatingly through the blocking control mechanism.

[0011] It is further defined that the blocking control mechanism includes a linkage plate, a linkage base, a first hinge shaft, a second hinge shaft and a third hinge shaft; The linkage plate is arranged in parallel with the linkage rod, and the bottom end of the linkage rod is rotatably connected with the linkage plate through a first hinge shaft; The linkage plate is rotatably connected to the linkage base via a second hinge shaft; The linkage plate is rotatably connected to one end of the blocking plate via a third hinge shaft; The first hinge axis, the second hinge axis and the third hinge axis are sequentially connected to form a triangular structure, and the linkage rod moves up and down to control the linkage plate to rotate back and forth around the second hinge axis, driving the blocking plate to approach or move away from the circuit breaker positioning plate.

[0012] It is further defined that a first guide hole is provided on the linkage base, and one end of the blocking plate passes through the first guide hole and is rotatably connected to the linkage plate.

[0013] It is further defined that the blocking control mechanism also includes a guide plate, which is located between the linkage base and the circuit breaker positioning plate, and a second guide hole is opened on the guide plate, and the second guide hole is opposite to the first guide hole. One end of the blocking plate passes through the first guide hole and is rotatably connected to the linkage plate, and the other end of the blocking plate passes through the second guide hole and is opposite to the circuit breaker positioning plate.

[0014] A method for interlocking a trolley and an earthing switch, based on the interlocking device for the trolley and the earthing switch, comprises the following steps: Determine the state of the circuit breaker trolley. If it is ready to be connected, execute steps S11 to S14; if it is ready to be connected, execute steps S21 to S24; S11. Move the circuit breaker trolley out and detach it from the circuit breaker positioning plate; S12, slide the interlocking small valve downward, so that the interlocking rod drives the blocking plate close to the circuit breaker positioning plate through the blocking control mechanism; S13, connecting the operating handle to the end corresponding to the knife switch control mechanism; S14, turning the operating handle to close the grounding switch through the switch control mechanism; S21, reversely rotate the operating handle to disconnect the grounding switch through the switch control mechanism; S22, disassembling the end portion corresponding to the operating handle and the knife switch control mechanism; S23, slide the interlocking small valve upwards, so that the interlocking rod drives the blocking plate away from the circuit breaker positioning plate through the blocking control mechanism; S24. Move the circuit breaker trolley in and connect it with the circuit breaker positioning plate.

[0015] The beneficial effects of the present invention are: 1. The present invention utilizes the circuit breaker access control unit and the interlocking small valve connection, and realizes the control of the circuit breaker trolley access by controlling the blocking plate to be close to or away from the circuit breaker positioning plate; at the same time, when the knife switch control mechanism is used to control the grounding knife switch, it is necessary to move the interlocking small valve to realize the control of the opening and closing of the grounding knife switch and the interlocking of the blocking of the circuit breaker positioning plate, thereby ensuring the five-protection requirements of the circuit breaker room; at the same time, the overall structure is simple and low in cost, the working reliability is improved, and the use is safe and reliable.

[0016] 2. The present invention utilizes the cooperation of the first limit plate and the limit support to limit the rotation angle of the ground cutter shaft, thereby avoiding structural deformation caused by excessive rotation, improving the reliability and service life of the overall structure, and ensuring that the interlocking is more stable and the operation is safer; at the same time, the second limit plate cooperates with the interlocking small valve to ensure that the interlocking small valve avoids accidentally sliding up after sliding down, further ensuring that the operation is safer and reliable, and meeting actual use needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a diagram showing the installation state of the interlocking device for the trolley and the grounding switch of the present invention; Figure 2 This is a structural diagram of the connection between the interlocking device for the trolley and the grounding switch and the control cabinet of the present invention; Figure 3 for Figure 2 The enlarged schematic diagram of part A in the middle; Figure 4 This is a schematic diagram of the structure of the knife opening and closing control unit of the present invention; Figure 5 It is a schematic diagram of the connection between the limiting support and the first limiting plate of the present invention; Figure 6 It is a schematic diagram of the connection between the interlocking small valve and the second limiting plate of the present invention; Figure 7 Interlocking device for handcart and grounding switch of the present invention Figure 8 for Figure 6 The enlarged schematic diagram of part B in the middle; In the figure, 100-ground knife opening and closing control unit; 101-limit block; 102-limit opening; 110-interlocking small valve; 120-knife switch control mechanism; 121-limit support; 122-first limit plate; 123-ground knife rotating shaft; 124-second limit plate; 200-circuit breaker access control unit; 201-first guide hole; 202-second guide hole; 210-interlocking rod; 220-blocking control mechanism; 221-linkage plate; 222-linkage base; 223-first hinge axis; 224-second hinge axis; 225-third hinge axis; 226-guide plate; 230-blocking plate; 300-ground knife switch; 400-circuit breaker positioning plate; 500-control cabinet. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] The present invention provides an interlocking device for a trolley and an earthing switch, comprising an earthing switch opening and closing control unit 100 and a circuit breaker access control unit 200, wherein one end of the earthing switch opening and closing control unit 100 is connected to an earthing switch 300 for controlling the opening and closing of the earthing switch 300; the other end of the earthing switch opening and closing control unit 100 is connected to one end of the circuit breaker access control unit 200, and the other end of the circuit breaker access control unit 200 is close to a circuit breaker positioning plate 400 for controlling the shielding of the circuit breaker positioning plate 400, thereby avoiding the circuit breaker trolley from being connected when the circuit breaker positioning plate 400 is blocked; when the earthing switch opening and closing control unit 100 is actuated to close the circuit breaker, the circuit breaker access control unit 200 is driven to shield the circuit breaker positioning plate 400; conversely, when the earthing switch opening and closing control unit 100 is opened, the circuit breaker access control unit 200 is driven to cancel the shielding of the circuit breaker positioning plate 400.

[0020] For example, when the grounding switch 300 is controlled by the grounding switch opening and closing control unit 100 to be closed, the circuit breaker access control unit 200 blocks the circuit breaker positioning plate 400; that is, when the grounding switch 300 is in the closed state, the circuit breaker trolley cannot move.

[0021] When the grounding switch 300 is controlled by the grounding switch opening and closing control unit 100 to be opened, the circuit breaker access control unit 200 cancels the shielding of the circuit breaker positioning plate 400; that is, the circuit breaker trolley can be swung from the test position to the working position only when the grounding switch is in the open state.

[0022] When the circuit breaker trolley is in the working position, the circuit breaker trolley cooperates with the circuit breaker positioning plate 400 to prevent the circuit breaker access control unit 200 from blocking the circuit breaker positioning plate 400. Therefore, the circuit breaker access control unit 200 restricts the action of the earth switch opening and closing control unit 100, so that the earth switch 300 cannot be closed; and when the circuit breaker trolley is moved out, the earth switch opening and closing control unit 100 can be used to close the switch, thereby realizing the interlocking of the trolley and the earth switch.

[0023] Example 1 refer to Figure 1~Figure 3 The interlocking device for the trolley and the grounding switch provided in this embodiment, the grounding switch opening and closing control unit 100 includes an interlocking small valve 110 and a switch control mechanism 120, and the circuit breaker access control unit 200 includes a locking rod 210, a blocking control mechanism 220 and a blocking plate 230.

[0024] To further explain, the interlocking small valve 110 is installed on the side end of the control cabinet 500, and the interlocking small valve 110 is slidably connected to the side end of the control cabinet 500 along the vertical direction. The interlocking small valve 110 is provided with a pressing plate extending to the outside of the control cabinet 500, so that the interlocking small valve 110 can move downward through the pressing plate.

[0025] The interlocking small valve 110 is sleeved on the outer side of one end of the knife switch control mechanism 120. When the interlocking small valve 110 slides downward, the position of the knife switch control mechanism 120 remains unchanged. The interlocking small valve 110 slides down to one end of the knife switch control mechanism 120 and is exposed. The operator can use the operating handle to rotate the knife switch control mechanism 120 to realize the closing control of the grounding knife switch 300. At this time, the other end of the knife switch control mechanism 120 is transmission connected to the grounding knife switch 300.

[0026] The locking rod 210 is vertically arranged, the top of the locking rod 210 is connected to the interlocking small valve 110, the other end of the locking rod 210 is connected to the blocking control mechanism 220, one end of the blocking plate 230 is connected to the blocking control mechanism 220, and the other end of the blocking plate 230 faces the circuit breaker positioning plate 400; the blocking control mechanism 220 is connected to the inside of the control cabinet 500.

[0027] When the interlocking small valve 110 slides downward, it drives the locking rod 210 to move downward in the vertical direction, and the blocking control mechanism 220 converts the downward torque of the locking rod 210 into a horizontal torque, thereby driving the horizontally arranged blocking plate 230 to approach the circuit breaker positioning plate 400 in the horizontal direction, thereby blocking the circuit breaker positioning plate 400, preventing the circuit breaker trolley from accessing, realizing interlocking, and making the operation more reliable and safe.

[0028] Example 2 Referring to the figure, based on Example 1, the knife switch control mechanism 120 provided in this embodiment includes a limit support 121, a first limit plate 122, a ground knife rotating shaft 123 and a second limit plate 124.

[0029] Among them, one end of the ground knife rotating shaft 123 is close to the interlocking small valve 110. After the interlocking small valve 110 slides down, the corresponding end of the ground knife rotating shaft 123 is used to cooperate with the operating handle, and the other end of the ground knife rotating shaft 123 is connected to the grounding knife switch 300 through a bevel gear set, so that the ground knife rotating shaft 123 rotates to control the opening and closing of the grounding knife switch 300; the limit support 121, the first limit plate 122 and the second limit plate 124 are sequentially sleeved on the outside of the ground knife rotating shaft 123, the first limit plate 122 and the second limit plate 124 are both tightly connected to the ground knife rotating shaft 123, the limit support 121 is close to the interlocking small valve 110, the first limit plate 122 is close to the limit support 121, and the limit support 121 is connected to the inside of the control cabinet 500, so that when the ground knife rotating shaft 123 rotates, the limit support 121 remains stationary.

[0030] refer to Figure 5 Specifically, a limiting block 101 is provided on the end surface of the limiting support 121, and the limiting block 101 faces the first limiting plate 122. The first limiting plate 122 has a limiting opening 102, so that the limiting opening 102 is sleeved on the outer side of the limiting block 101, so that when the first limiting plate 122 rotates following the ground cutter shaft 123, the limiting opening 102 constrains the rotation angle of the first limiting plate 122 under the limitation of the limiting block 101, thereby avoiding structural failure caused by excessive rotation angle of the ground cutter shaft 123; the service life is improved, and at the same time, safe and reliable use is guaranteed to meet actual use needs.

[0031] Preferably, the same-direction rotation angle of the ground knife shaft 123 is 90°, that is, in the initial state, the grounding knife switch 300 is in the open state. At this time, the grounding knife shaft 123 rotates 90° clockwise to close the grounding knife switch 300; and rotates another 90° counterclockwise to open the grounding knife switch 300; in the initial state, the grounding knife shaft 123 cannot rotate counterclockwise to ensure that the actual operation process is safe and reliable.

[0032] refer to Figure 6, further explained, in order to prevent the interlocking small valve 110 from accidentally resetting after the operating handle falls off after the grounding switch 300 is closed, causing interlocking failure, the second limit plate 122 is used to cooperate with the interlocking small valve 110. When the second limit plate 122 rotates 90° following the grounding knife shaft 123, it is engaged with the interlocking small valve 110, so that when the grounding switch 300 is closed, the interlocking small valve 110 remains in a sliding state, thereby improving the safety and reliability of the operation.

[0033] At the same time, in order to allow the interlocking small valve 110 to slide upward to reset while the operating handle is taken out after the grounding knife switch 300 is opened, the knife opening and closing control unit 100 preferably also includes a reset spring, which is located inside the control cabinet 500, one end of the reset spring is connected to the inside of the control cabinet 500, and the other end of the reset spring is connected to the interlocking small valve 110.

[0034] Example 3 refer to Figure 7 and Figure 8 Based on Example 2, the interlocking device for the trolley and the grounding switch provided in this embodiment, the blocking control mechanism 220 includes a linkage plate 221, a linkage base 222, a first hinge shaft 223, a second hinge shaft 224 and a third hinge shaft 225.

[0035] The linkage plate 221 is arranged parallel to the linkage rod 210 , the linkage plate 221 is arranged perpendicular to the circuit breaker positioning plate 400 , the blocking plate 230 reciprocating direction is perpendicular to the circuit breaker positioning plate 400 , and the blocking plate 230 is parallel to the linkage plate 221 .

[0036] The linkage base 222 is connected to the interior of the control cabinet 500 and is used to support the linkage plate 221; the locking rod 210 is arranged vertically, and the bottom of the locking rod 210 is rotatably connected to the first vertex angle of the linkage plate 221 through the first hinge shaft 223; the second vertex angle of the linkage plate 221 is rotatably connected to the linkage base 222 through the second hinge shaft 224, so that when the locking rod 210 moves downward, it drives the linkage plate 221 to rotate around the second vertex angle; one end of the blocking plate 230 is rotatably connected to the third vertex angle of the linkage plate 221 through the third hinge shaft 225, and the first hinge shaft 223, the second hinge shaft 224 and the third hinge shaft 225 are arranged in sequence from top to bottom, so when the locking rod 210 drives the linkage plate 221 to rotate around the second hinge shaft 224, the linkage plate 221 drives the blocking plate 230 to approach or move away from the circuit breaker positioning plate 400.

[0037] In order to ensure that the blocking plate 230 remains stable during movement, a first guide hole 201 is preferably opened on the linkage base 222. At this time, one end of the blocking plate 230 passes through the first guide hole 201 and is rotatably connected to the linkage plate 221 via the third hinge shaft 225.

[0038] Furthermore, in order to further improve the working reliability of the blocking plate 230, the blocking control mechanism 220 preferably also includes a guide plate 226, which is connected to the interior of the control cabinet 500, and a second guide hole 202 is opened on the guide plate 226, so that the other end of the blocking plate 230 passes through the second guide hole 202 and extends to the outside of the circuit breaker positioning plate 400.

[0039] The overall structure is simple, the reliability is high, the interlocking is reliable during use, the safety of use is improved, and the actual use needs are met.

[0040] Example 4 Based on the interlocking device for a trolley and an earthing switch provided in any one of Embodiments 1 to 3, this embodiment provides an interlocking method for a trolley and an earthing switch, comprising the following steps: Determine the state of the circuit breaker trolley. If the circuit breaker trolley is in the waiting state, it means that the circuit breaker trolley needs to be closed after being connected, and the corresponding steps are executed in steps S11~S14; if the circuit breaker trolley is in the waiting state, it means that the circuit breaker trolley needs to be opened before being connected, and the corresponding steps are executed in steps S21~S24.

[0041] The closing interlocking operation includes the following steps: S11, move the circuit breaker trolley out to separate it from the circuit breaker positioning plate 400; S12, slide the interlocking small valve 110 downward, so that the locking rod 210 drives the blocking plate 230 to approach the circuit breaker positioning plate 400 through the blocking control mechanism 220; Specifically, the small sliding interlocking valve 110 is moved downward, and the linkage plate 221 is driven to rotate downward around the first hinge shaft 223, so that the linkage plate 221 pushes the blocking plate 230 close to the circuit breaker positioning plate 400, thereby blocking the circuit breaker positioning plate 400 and preventing the circuit breaker trolley from being connected later.

[0042] S13, connecting the operating handle to the corresponding end of the knife switch control mechanism 120; S14, turning the operating handle to close the grounding switch 300 through the switch control mechanism 120.

[0043] Specifically, after the interlocking small valve 110 is slid down, the operating handle is used to connect to the end of the grounding knife shaft 123, and then the grounding knife shaft 123 is rotated clockwise until the limit block 101 contacts one side of the limit opening 102 to complete the closing of the grounding knife switch 300; at the same time, the second limit plate 124 realizes the locking limit of the interlocking small valve 110, and the interlocking small valve 110 maintains the sliding state, thereby realizing the continuous blocking of the circuit breaker positioning plate 400.

[0044] The opening interlocking operation includes the following steps: S21, rotating the operating handle in the opposite direction, disconnecting the grounding switch 300 through the switch control mechanism 120; S22, disassembling the end portion corresponding to the operating handle and the knife switch control mechanism 120; Specifically, on the contrary, when it is necessary to connect the circuit breaker trolley, the grounding switch 300 needs to be opened. At this time, the grounding switch shaft 123 is rotated counterclockwise until the limit block 101 contacts the other side of the limit opening 102 to achieve limit. When the grounding switch 300 is opened, the second limit plate 124 rotates in the opposite direction to release the constraint on the interlocking small valve 110, and then the operating handle is taken out.

[0045] S23, slide the interlocking small valve 110 upward, so that the locking rod 210 drives the blocking plate 230 away from the circuit breaker positioning plate 400 through the blocking control mechanism 220; S24, move the circuit breaker trolley in and engage it with the circuit breaker positioning plate 400.

[0046] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the present invention.

Claims

1. An interlocking device for a trolley and an earthing switch, characterized in that: It comprises a grounding knife opening and closing control unit (100) connected to a grounding knife switch (300) and a circuit breaker access control unit (200) arranged on one side of a circuit breaker positioning plate (400); the grounding knife opening and closing control unit (100) comprises an interlocking small valve (110) and a knife switch control mechanism (120), and the circuit breaker access control unit (200) comprises a locking rod (210), a blocking control mechanism (220) and a blocking plate (230); The interlocking small valve (110) is arranged outside one end of a knife switch control mechanism (120), and the other end of the knife switch control mechanism (120) is connected to the grounding knife switch (300); one end of the chain rod (210) is connected to the interlocking small valve (110), and the sliding directions of the chain rod (210) and the interlocking small valve (110) are arranged in the same direction; the other end of the chain rod (210) is connected to one end of a blocking plate (230) through a blocking control mechanism (220), and the other end of the blocking plate (230) faces the circuit breaker positioning plate (400); the interlocking small valve (110) slides through the chain rod (210) and the blocking control mechanism (220) to drive the blocking plate (230) to approach or move away from the circuit breaker positioning plate (400).

2. The interlocking device for the trolley and the earthing switch according to claim 1 is characterized in that: The knife switch control mechanism (120) comprises a limit support (121), a first limit plate (122) and a ground knife rotating shaft (123); The limiting support (121) is sleeved on the outer side of the ground cutter rotating shaft (123), one end of the limiting support (121) is close to the interlocking small valve (110), and the other end of the limiting support (121) is close to the first limiting plate (122), and the first limiting plate (122) is sleeved on the ground cutter rotating shaft (123) and connected to the ground cutter rotating shaft (123); A limiting block (101) is disposed at the other end of the limiting support (121), and a limiting opening (102) is provided on the first limiting plate (122). The limiting block (101) contacts both sides of the limiting opening (102), thereby limiting the rotation angle of the first limiting plate (122) driven by the ground cutter rotating shaft (123).

3. The interlocking device for the trolley and the earthing switch according to claim 2 is characterized in that: The ground cutter rotating shaft (123) has a rotation angle of 90°.

4. The interlocking device for the trolley and the earthing switch according to claim 2 is characterized in that: The corresponding end of the grounding knife rotating shaft (123) is transmission-connected to the grounding knife switch (300) via a bevel gear set.

5. The interlocking device for the trolley and the grounding switch according to claim 2, characterized in that: The knife switch control mechanism (120) further comprises a second limit plate (124), wherein the second limit plate (124) is sleeved on the ground knife rotating shaft (123) and connected to the ground knife rotating shaft (123), and the ground knife rotating shaft (123) drives the second limit plate (124) to rotate to limit the interlocking small valve (110).

6. The interlocking device for the trolley and the earthing switch according to claim 1, characterized in that: The interlocking small valve (110) and the locking rod (210) are both arranged vertically, and the locking rod (210) moves back and forth vertically to drive the blocking plate (230) to move back and forth horizontally through the blocking control mechanism (220).

7. The interlocking device for a trolley and an earthing switch according to claim 6, characterized in that: The blocking control mechanism (220) comprises a linkage plate (221), a linkage base (222), a first hinge shaft (223), a second hinge shaft (224), and a third hinge shaft (225); The linkage plate (221) is arranged in parallel with the linkage rod (210), and the bottom end of the linkage rod (210) is rotatably connected to the linkage plate (221) via a first hinge shaft (223); The linkage plate (221) is rotatably connected to the linkage base (222) via a second hinge shaft (224); The linkage plate (221) is rotatably connected to one end of the blocking plate (230) via a third hinge shaft (225); The first hinge shaft (223), the second hinge shaft (224) and the third hinge shaft (225) are sequentially connected to form a triangular structure, and the linkage rod (210) moves up and down to control the linkage plate (221) to rotate back and forth around the second hinge shaft (224), thereby driving the blocking plate (230) to move closer to or away from the circuit breaker positioning plate (400).

8. The interlocking device for the trolley and the earthing switch according to claim 7, characterized in that: The linkage base (222) is provided with a first guide hole (201), and one end of the blocking plate (230) passes through the first guide hole (201) and is rotatably connected to the linkage plate (221).

9. The interlocking device for a trolley and an earthing switch according to claim 8, characterized in that: The blocking control mechanism (220) further comprises a guide plate (226), the guide plate (226) being located between the linkage base (222) and the circuit breaker positioning plate (400), a second guide hole (202) being provided on the guide plate (226), the second guide hole (202) being opposite to the first guide hole (201), one end of the blocking plate (230) passing through the first guide hole (201) to be rotatably connected to the linkage plate (221), and the other end of the blocking plate (230) passing through the second guide hole (202) to be opposite to the circuit breaker positioning plate (400).

10. A method for interlocking a trolley and a grounding switch, characterized in that: The interlocking device for the trolley and the earthing switch according to claim 1 comprises the following steps: Determine the state of the circuit breaker trolley. If it is ready to be connected, execute steps S11 to S14; if it is ready to be connected, execute steps S21 to S24; S11, move the circuit breaker trolley out to separate it from the circuit breaker positioning plate (400); S12, sliding the interlocking small valve (110) downward, so that the locking rod (210) drives the blocking plate (230) to approach the circuit breaker positioning plate (400) by using the blocking control mechanism (220); S13, connecting the operating handle to the corresponding end of the knife switch control mechanism (120); S14, turning the operating handle to close the grounding switch (300) through the switch control mechanism (120); S21, rotating the operating handle in the opposite direction, disconnecting the grounding switch (300) through the switch control mechanism (120); S22, disassembling the end portions corresponding to the operating handle and the knife switch control mechanism (120); S23, sliding the interlocking small valve (110) upward, so that the locking rod (210) drives the blocking plate (230) away from the circuit breaker positioning plate (400) by means of the blocking control mechanism (220); S24. Move the circuit breaker trolley in and engage it with the circuit breaker positioning plate (400).

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