Interlocking device for connecting upper cabinet and lower cabinet in environment-friendly cabinet

Abstract

The utility model discloses an interlocking device for connecting an upper cabinet and a lower cabinet in an environment-friendly cabinet, which belongs to the technical field of electric cabinet door interlocking devices and comprises an interlocking assembly connected with the upper cabinet and a connecting assembly connected with the lower cabinet. The interlocking assembly comprises a circuit breaker three-station interlocking plate, a first spring, an interlocking fixing plate, a circuit breaker grounding lower door interlocking plate, a connecting plate, a circuit breaker opening prevention interlocking plate, a door hanging pull rod and an upper square rod, the connecting assembly comprises a protruding part, a first door hanging buckle and a second door hanging buckle, and the interlocking fixing plate is fixed on the environment-friendly cabinet; the door hanging pull rod moves up and down to perform grounding interlocking operation, so that the interlocking structure is simplified, and the interlocking stability is improved; moreover, the circuit breaker three-station interlocking plate can shield the position of an isolation mechanism gate when the circuit breaker is in a closed state, and can shield the position of a circuit breaker gate when the circuit breaker opening prevention interlocking plate is not hung on a cabinet door, thereby avoiding the risk caused by the mistaken touch of an operator.

Description

Technical Field

[0001] The utility model relates to a chain device for connecting an upper cabinet and a lower cabinet in an environmental protection cabinet, and belongs to the technical field of chain devices for electrical cabinet doors. Background Art

[0002] In electrical systems, the safety and protection requirements for cabinets are increasing, often requiring cabinets to have strict protection measures to prevent safety issues caused by misoperation. Therefore, a dual anti-locking device with upper isolation and lower door interlocking was developed to improve the safety and reliability of environmental protection cabinets.

[0003] When operating or repairing an electrical cabinet, in order to ensure the safety of on-site personnel, the electrical equipment in the circuit must be completely isolated from the power supply. Therefore, an interlocking device is usually installed in the electrical cabinet to link the opening and closing operations with the door, so that the door can only be opened when the switch is closed.

[0004] Existing interlocking devices usually integrate multiple interlocking switches together, which have complex structures, redundant functions, poor stability, unreliable interlocking, and insufficient protection for the gate positions of circuit breakers and isolation mechanisms. Utility Model Content

[0005] The purpose of the utility model is to provide a chain device connecting the upper cabinet and the lower cabinet in the environmental protection cabinet, so as to solve the problems of poor stability and inadequate protection of the gate in the prior art.

[0006] In order to achieve the above objectives, the present invention adopts the following technical solutions:

[0007] The utility model provides a chain device connecting an upper cabinet and a lower cabinet in an environmental protection cabinet, comprising a chain assembly connecting the upper cabinet and a connecting assembly connecting the lower cabinet, the chain assembly comprising a circuit breaker three-position chain plate, a first spring, a chain fixing plate, a circuit breaker grounding lower door interlocking plate, a connecting plate, a circuit breaker opening prevention chain plate, a door hanging rod and an upper rod, the connecting assembly comprising a third protrusion, a first door hanging buckle and a second door hanging buckle, the chain fixing plate being fixed on the environmental protection cabinet;

[0008] The bottom of the circuit breaker three-position interlocking plate rests on the first protrusion on the circuit breaker opening and closing cam in the environmental protection cabinet, and is also connected to the interlocking fixing plate via the first spring. When the first protrusion on the circuit breaker opening and closing cam is in a vertical state, the circuit breaker three-position interlocking plate is in a position to block the gate of the isolation mechanism in the upper cabinet;

[0009] The circuit breaker grounded lower door interlock plate has a lower end connected to the anti-circuit breaker opening interlock plate and the door hanging rod, and an upper end connected to the connecting plate and the upper rod in sequence. The top also presses against the second protrusion on the circuit breaker opening and closing cam. The upper rod is inserted into the through hole on the interlock fixing plate. When the cabinet door is not hung, the upper rod is in a fixed state. At this time, the anti-circuit breaker opening interlock plate is located at a position that blocks the circuit breaker door.

[0010] The bottom end of the door hanging rod is stuck in the first door hanging buckle, the first door hanging buckle is fixed to the upper end surface of the lower cabinet door, the second door hanging buckle is arranged on the upper end surface of the lower cabinet, the third protrusion is arranged on the bottom frame of the upper cabinet, and the second door hanging buckle is sleeved on the third protrusion.

[0011] Furthermore, it also includes a third spring, a first locking mechanism and a second locking mechanism. A first groove and a second groove are provided on the upper rod from top to bottom. The first locking mechanism is connected to the isolation mechanism in the environmental protection cabinet. When the isolation mechanism is in the grounded closed state, the first locking mechanism is not located in the first groove. When the isolation mechanism is in the grounded open state, the first locking mechanism is located in the first groove. The second locking mechanism and the interlocking fixing plate are connected by a third spring. The third spring is in a vertical state, and the second locking mechanism is located in the second groove.

[0012] Furthermore, the second door hook is provided with a hole having the same shape as the third protrusion, and the second door hook is sleeved on the third protrusion through the hole.

[0013] Furthermore, the third protrusion is a rivet bolt, and the second door hook is a ring-shaped door hook.

[0014] Furthermore, it also includes a pad, which is arranged between the upper end surface of the lower cabinet and the second door hook.

[0015] Furthermore, when the three-position interlocking plate of the circuit breaker is in the upper position, the first spring is in a stretched state, and when the three-position interlocking plate of the circuit breaker is in the lower position, the first spring is in a normal state.

[0016] Furthermore, the first locking mechanism includes a guide plate and a locking plate that are fixedly connected, the guide plate and the locking plate are stacked up and down and fixedly connected, and the sum of the thicknesses of the guide plate and the locking plate is equal to the width of the first groove.

[0017] Furthermore, the third spring connects the lower end of the second locking mechanism and the interlocking fixing plate.

[0018] Furthermore, the third protrusion is higher than the second door hook in the vertical direction.

[0019] Furthermore, when the first protrusion on the circuit breaker opening and closing cam is in a vertical state, the circuit breaker three-position interlocking plate is in an upper position, which is a position that blocks the gate of the isolation mechanism in the upper cabinet; when the first protrusion on the circuit breaker opening and closing cam is in a horizontal state, the circuit breaker three-position interlocking plate is in a lower position, which is a position that does not block the gate of the isolation mechanism in the upper cabinet.

[0020] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0021] The utility model provides a chain device connecting the upper cabinet and the lower cabinet in an environmental protection cabinet. The chain device performs the chain operation of grounding by cooperating the movement of the circuit breaker grounding lower door interlock plate and the circuit breaker three-position chain plate and utilizing the up and down movement of the door hanging rod, thereby further controlling the state of the mechanism. When the circuit breaker is in the isolation trip state and the circuit breaker is closed, the door hanging rod no longer abuts against the first door hook, thereby no longer chaining the door, thereby facilitating the opening of the door of the lower cabinet. When the circuit breaker is in the grounding trip state and the circuit breaker is opened, the lower end of the door hanging rod abuts against the first door hook of the lower cabinet, blocking the door and preventing the door from being lifted up and opened, thereby simplifying the chain structure and improving the stability of the chain. In addition, the circuit breaker three-position chain plate can block the position of the isolation mechanism gate when the circuit breaker is in the closed state. The anti-circuit breaker opening chain plate can block the position of the circuit breaker gate when the lower cabinet door is not hung, thereby avoiding the risk of accidental touch by the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural diagram of a chain device connecting the upper cabinet and the lower cabinet in the environmental protection cabinet provided by the utility model;

[0023] Figure 2 This is a schematic diagram of a linkage device for connecting the upper cabinet and the lower cabinet of an environmental protection cabinet and a connection diagram of the upper cabinet and the lower cabinet of the environmental protection cabinet provided by the utility model;

[0024] Figure 3 This is a schematic diagram of the positions of the circuit breaker three-position interlocking plate, the circuit breaker grounding door interlocking plate and the circuit breaker opening and closing cams provided by the utility model;

[0025] Figure 4 This is a schematic diagram of the position of the anti-circuit breaker opening interlocking plate provided by the utility model;

[0026] Figure 5 This is a schematic diagram of the position of the grounding lower door interlock plate of the circuit breaker provided by the utility model;

[0027] Figure 6 This is a schematic structural diagram of the upper rod provided by the utility model;

[0028] Figure 7 This is a schematic diagram of the positions of the upper rod and the interlocking fixing plate provided by the utility model;

[0029] Figure 8 This is a schematic diagram of the positions of the three-position interlocking plate and the isolation mechanism of the circuit breaker provided by the utility model;

[0030] Figure 9 This is a schematic diagram of the positions of the guide plate and the grounding interlocking plate provided by the present invention;

[0031] Figure 10 This is a schematic diagram of the connection between the interlocking assembly and the lower cabinet provided by the utility model;

[0032] Figure 11 This is a schematic diagram of the connection position of the second door hook provided by the present invention;

[0033] Figure 12 This is a structural diagram of the door hanging rod provided by the utility model;

[0034] Figure 13 This is a structural diagram of the grounding lower door interlocking plate of the circuit breaker provided by the utility model;

[0035] Figure 14 It is a structural schematic diagram of the circuit breaker opening prevention interlocking plate provided by the utility model.

[0036] Figure: 1. Circuit breaker opening and closing cam; 2. Opening toggle plate; 3. Opening coil; 4. First spring; 5. First connecting hole; 6. Disconnector opening and closing isolation operating position; 7. Disconnector opening and closing earthing operating position; 8. Bent edge of the circuit breaker three-position interlocking plate; 9. Top edge of the circuit breaker three-position interlocking plate; 10. Isolating position toggle plate; 11. Earthing position toggle plate; 12. Earthing interlocking plate; 15. Second connecting hole; 20. First fixing hole; 21. Second fixing hole; 22. Third fixing hole; 26. Fourth fixing hole; 30. Pull rod fixing hole; 31. U-shaped door hook insertion slot; 33. Lower cabinet door; 36. First door hook; 38. Spacer; 51. Second spring; 52. First groove; 54. Second groove; 61. First protrusion; 62. Second protrusion; 72. Isolation mechanism; 74. Isolation mechanism interlocking assembly; 75. Interlocking fixing plate; 76. Upper rod; 77. Guide plate; 79. Locking plate; 80. Compression rivet nut; 81. Interlocking baffle; 82. Third spring; 85. Circuit breaker three-position interlocking plate; 86. Circuit breaker opening interlocking plate; 87. Door hanging rod; 88. Connecting plate; 89. Circuit breaker grounding lower door interlocking plate; 91. Circuit breaker; 142. Lower cabinet door upper frame plate; 143. Compression rivet bolt; 144. Second door hook. DETAILED DESCRIPTION

[0037] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are not intended to limit the scope of protection of the present invention.

[0038] In the description of the utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model; in addition, the terms "first", "second" and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features; thus, features limited to "first", "second" and the like may explicitly or implicitly include one or more of such features; in the description of the utility model, unless otherwise specified, "multiple" means two or more.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be a connection between the internal parts of two components; for ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] Example 1.

[0041] The utility model provides a chain device connecting an upper cabinet and a lower cabinet in an environmental protection cabinet, comprising a chain assembly connecting the upper cabinet and a connecting assembly connecting the lower cabinet, the chain assembly comprising a circuit breaker three-position chain plate, a first spring, a chain fixing plate, a circuit breaker grounding lower door interlocking plate, a connecting plate, a circuit breaker opening prevention chain plate, a door hanging rod and an upper rod, the connecting assembly comprising a third protrusion, a first door hanging buckle and a second door hanging buckle, and the chain fixing plate is fixed on the environmental protection cabinet.

[0042] The three-position interlocking plate of the circuit breaker has its bottom pressed against the first protrusion on the opening and closing cam of the circuit breaker in the environmental protection cabinet, and is also connected to the interlocking fixed plate through a first spring. When the first protrusion on the opening and closing cam of the circuit breaker is in a vertical state, the three-position interlocking plate of the circuit breaker is in an upper position, which is a position for blocking the gate of the isolation mechanism in the upper cabinet. When the first protrusion on the opening and closing cam of the circuit breaker is in a horizontal state, the three-position interlocking plate of the circuit breaker is in a lower position, which is a position for not blocking the gate of the isolation mechanism in the upper cabinet.

[0043] The circuit breaker grounded lower door interlock plate has its lower end connected to the anti-circuit breaker trip interlock plate and the door hanging rod respectively, and its upper end is connected to the plate and the upper rod in sequence. The top is also pressed against the second protrusion on the circuit breaker opening and closing cam. The upper rod is inserted into the through hole on the interlock fixing plate. When the cabinet door is not hung down, the upper rod is in a fixed state. At this time, the anti-circuit breaker trip interlock plate is located in a position that blocks the circuit breaker door.

[0044] The bottom end of the door hanging rod is stuck in the first door hanging buckle, the first door hanging buckle is fixed to the upper end surface of the lower cabinet door, the second door hanging buckle is arranged on the upper end surface of the lower cabinet, the third protrusion is arranged on the bottom frame of the upper cabinet, and the second door hanging buckle is sleeved on the third protrusion.

[0045] By cooperating the movement of the circuit breaker grounding lower door interlock plate and the circuit breaker three-position interlock plate, the grounding interlock operation is performed by utilizing the up and down movement of the door hanging rod, thereby further controlling the state of the mechanism. When in the grounding, closing, isolating and opening state, the door hanging rod no longer rests against the first door hook, thereby no longer interlocking the door, making it convenient to open the door of the lower cabinet. When in the grounding and opening state, the lower end of the door hanging rod rests against the first door hook of the lower cabinet, blocking the door and preventing the door from being lifted up and opened, thereby simplifying the interlock structure and improving the stability of the interlock. Moreover, when the circuit breaker is in the closed state, the circuit breaker three-position interlock plate can block the position of the isolation mechanism gate. When the circuit breaker opening interlock plate is not hung on the lower cabinet door, it can block the position of the circuit breaker gate, thereby avoiding the risk of accidental touch by the operator.

[0046] When the circuit breaker is in the closed state, the first protrusion on the circuit breaker opening and closing cam is driven by the internal circuit breaker to rotate to a vertical state, pushing the circuit breaker three-position interlocking plate to the upper position, blocking the gate of the isolation mechanism; when the circuit breaker is in the open state, the second protrusion on the circuit breaker opening and closing cam is driven by the internal circuit breaker to rotate to a vertical state, supporting the circuit breaker grounding lower door interlocking plate, so that the circuit breaker grounding lower door interlocking plate cannot move upward, and the lower end of the door hanging rod will abut against the first door hook of the lower cabinet, blocking the door and preventing the door from being lifted up and opened (the first protrusion and the second protrusion on the circuit breaker opening and closing cam are perpendicular to each other, when one is in a vertical state, the other is in a horizontal state).

[0047] Example 2.

[0048] like Figures 1 to 14As shown, the utility model provides a chain device for connecting the upper cabinet and the lower cabinet in the environmental protection cabinet, and the environmental protection cabinet connected thereto, together including a circuit breaker opening and closing cam 1, an opening toggle plate 2, an opening coil 3, a first spring 4, a first connection hole 5, an isolating switch opening and closing isolation operation position 6, an isolating switch opening and closing grounding operation position 7, a circuit breaker three-position chain plate bent edge 8, a top edge of the circuit breaker three-position chain plate 9, an isolation position toggle plate 10, a grounding position toggle plate 11, a grounding chain plate 12, a second connection hole 15, a first fixing hole 20, a second fixing hole 21, a third fixing hole 22, and a fourth fixing hole 26. , pull rod fixing hole 30, lower cabinet door 33, first door hook 36, pad 38, second spring 51, first groove opening 52, second groove opening 54, isolation mechanism 72, isolation mechanism interlocking assembly 74, interlocking fixing plate 75, upper rod 76, guide plate 77, locking plate 79, rivet nut 80, interlocking baffle 81, third spring 82, circuit breaker three-position interlocking plate 85, anti-circuit breaker opening interlocking plate 86, door hanging rod 87, connecting plate 88, circuit breaker grounding lower door interlocking plate 89, circuit breaker 91, lower cabinet door upper frame plate 142, rivet bolt 143, second door hook 144.

[0049] The utility model provides a chain device for connecting an upper cabinet and a lower cabinet in an environmental protection cabinet, comprising a first spring 4, a first connecting hole 5, a bent edge 8 of a three-position chain plate of a circuit breaker, a top edge 9 of the three-position chain plate of the circuit breaker, a grounding chain plate 12, a second connecting hole 15, a first fixing hole 20, a second fixing hole 21, a third fixing hole 22, a fourth fixing hole 26, a pull rod fixing hole 30, a first door hanging buckle 36, a pad 38, a second spring 51, a first groove 52, a second groove 54, a chain fixing plate 75, an upper rod 76, a guide plate 77, a locking piece 79, a rivet nut 80, a chain baffle 81, a third spring 82, a three-position chain plate of a circuit breaker 85, an anti-circuit breaker opening chain plate 86, a door hanging rod 87, a connecting plate 88, a grounding lower door interlocking plate 89 of the circuit breaker, a circuit breaker 91, a rivet bolt 143, and a second door hanging buckle 144.

[0050] like Figure 3 As shown, the bottom of the circuit breaker three-position interlocking plate 85 is pressed against the circuit breaker opening and closing cam 1 in the environmental protection cabinet, as shown in FIG. Figure 5As shown, it is also connected to the interlocking fixed plate 75 through the first spring 4. When the circuit breaker 91 is closed, the internal main shaft rotates to drive the first protrusion 61 on the circuit breaker opening and closing cam 1 to rotate 90 degrees clockwise to a vertical position (the first protrusion 61 on the circuit breaker opening and closing cam 1 is in a horizontal position before rotation), thereby causing the circuit breaker three-position interlocking plate 85 to move upward by a certain distance to reach the upper position, which is a position for blocking the isolation mechanism gate in the upper cabinet. At this time, the second protrusion 62 on the circuit breaker opening and closing cam 1 rotates to a horizontal position, and the circuit breaker grounding lower door interlocking plate 89 can move upward; when the first protrusion 61 on the circuit breaker opening and closing cam 1 is in a horizontal state, the circuit breaker three-position interlocking plate 85 is in a lower position, which is a position for not blocking the isolation mechanism gate in the upper cabinet. At this time, the second protrusion 62 on the circuit breaker opening and closing cam 1 rotates to a vertical position, and the circuit breaker grounding lower door interlocking plate 89 is supported by the second protrusion 62 and cannot move upward.

[0051] like Figure 10 As shown, the circuit breaker grounding lower door interlock plate 89, the lower end of which is connected to the anti-circuit breaker opening interlock plate 86 and the hanging door pull rod 87, as shown in FIG. Figure 1 、 Figure 2 and Figure 5 As shown, the upper end is connected to the plate 88 and the upper rod 76 in sequence, and the upper rod 76 is inserted into the through hole on the interlocking fixing plate 75. When the cabinet door 33 is not hung down, the upper rod 76 is in a fixed state. At this time, the anti-circuit breaker opening interlocking plate 86 is located in a position that blocks the circuit breaker gate, as shown in FIG. Figure 4 As shown, the function of the anti-circuit breaker opening anti-locking plate 86 is to prevent the circuit breaker grounding lower door interlocking plate 89 from moving up and down when the cable room door (lower cabinet door 33) is not hung, so that the anti-circuit breaker opening anti-locking plate 86 is in the position shown in FIG. Figure 4 The indicating position blocks the trip toggle plate 2 to prevent personnel from mistakenly pressing the trip button and causing the trip coil 3 to hit the trip toggle plate 2 and cause the circuit breaker to trip.

[0052] like Figure 5 As shown, one side of the connecting plate 88 is connected and fixed to the circuit breaker grounding lower door interlocking plate 89 (through the second connecting hole 15), and the other side is connected and fixed to the upper rod 76. When the lower cabinet door 33 is closed, the circuit breaker grounding lower door interlocking plate 89 moves downward, thereby driving the upper rod 76 to move downward. This is due to the following structure:

[0053] like Figure 6 and Figure 7The figure shows the structure of the isolation mechanism interlocking assembly. A first groove opening 52 and a second groove opening 54 are provided on the upper rod 76 from top to bottom. The first locking mechanism is connected to the isolation mechanism 72 in the environmental protection cabinet. When the isolation mechanism 72 is in the grounding closed state, the first locking mechanism is not located in the first groove opening 52. When the isolation mechanism 72 is in the grounding open state, the first locking mechanism is located in the first groove opening 52. The second locking mechanism and the interlocking fixed plate 75 are connected by a third spring 82. The third spring 82 is in a vertical state, and the second locking mechanism is located in the second groove opening 54; the first locking mechanism includes a fixedly connected guide plate 77 and a locking plate 79. The guide plate 77 and the locking plate 79 are stacked up and fixedly connected, and are fixedly connected by a rivet nut 80. The sum of the thickness of the guide plate 77 and the locking plate 79 is equal to the width of the first groove opening 52. The second locking mechanism in this embodiment is an interlocking baffle 81, which is fixed in the second groove opening 54.

[0054] When the grounding is closed, Figure 9 As shown, the isolation mechanism 72 moves the grounding interlocking plate 12 to the left through a series of movements, and then contacts the guide plate 77 to push the guide plate 77 to move to the left. Driven by the first spring 51, the locking plate 79 is removed from the first groove 52 on the upper rod 76. At this time, the upper rod 76 can move up and down (the third spring 82 can be compressed and stretched, corresponding to the downward and upward movement of the upper rod 76, so that the lower cabinet door 33 can drive the upper rod 76 to move downward when the door is hung, and the third spring 82 is compressed at this time).

[0055] When the circuit breaker 91 is closed, the circuit breaker three-position interlocking plate 85 moves upward to the upper position, causing the first connecting hole 5 (the connecting hole for the circuit breaker three-position interlocking plate 85 to connect to the first spring 4) to drive the first spring 4 to perform a stretching movement. When the circuit breaker 91 is opened, the first spring 4 rebounds and causes the circuit breaker three-position interlocking plate 85 to move downward to its original position (lower position).

[0056] like Figure 8 As shown, when the grounding is closed, the circuit breaker three-position interlocking plate 85 is in the position shown in FIG. Figure 8 In the position shown, the isolation position dial plate 10 and the grounding position dial plate 11 can be moved left and right. The grounding position dial plate 11 is moved to the left to expose the disconnector grounding operation position 7 for the grounding opening operation, and then the isolation position dial plate 10 is moved to the left to expose the disconnector isolation operation position 6 for the isolation closing operation. Then the circuit breaker 91 is closed, and the circuit breaker three-position interlock plate 85 is moved upward, so that the bent edge 8 of the circuit breaker three-position interlock plate blocks the grounding position dial plate 11, and the top edge 9 of the circuit breaker three-position interlock plate blocks the isolation position dial plate 10, so that the isolation opening and grounding closing operations cannot be performed, effectively preventing personnel from operating incorrectly.

[0057] like Figure 10As shown, the first door hook 36 (U-shaped) is connected and fixed to the center of the upper end surface of the lower cabinet door 33, and its U-shaped groove is inserted into the U-shaped door hook insertion groove 31 on the door hanging rod 87. The door hanging rod 87 is connected and fixed to the circuit breaker grounding lower door interlocking plate 89. When hanging the door, the door hanging rod 87 and the circuit breaker grounding lower door interlocking plate 89 are driven to move downward at the same time.

[0058] like Figure 11 As shown, the second door hook 144 (ring-shaped) and the gasket 38 are fixed together on the upper left end face of the lower cabinet door 33, and the rivet bolt 143 is riveted on the upper frame plate of the lower cabinet. After the door is hung, the round hole of the second door hook 144 is sleeved on the rivet bolt 143. When the grounding switch is opened, the isolation switch is closed, and the circuit breaker is closed, the second door hook 144 cannot exceed the upper surface of the rivet bolt 143. In this case, the cable room door (lower cabinet door 33) cannot be opened at all, ensuring the safety of the current operator.

[0059] like Figure 12 As shown, the door hanging rod 87 is provided with a rod fixing hole 30 and a U-shaped door hanging buckle insertion slot 31, and the rod fixing hole 30 is used to connect the circuit breaker grounding door interlocking plate 89.

[0060] like Figure 13 As shown, the circuit breaker grounding lower door interlock plate 89 is provided with a first fixing hole 20, a second fixing hole 21 and a third fixing hole 22. The first fixing hole 20 set at the uppermost end is used to connect the connecting plate 88, the second fixing hole 21 set at the lower middle position is used to connect the anti-circuit breaker opening interlock plate 86, and the third fixing hole 22 set at the lowermost end is used to connect the door hanging rod.

[0061] like Figure 14 As shown, the anti-circuit breaker trip interlocking plate 86 is provided with a fourth fixing hole 26 for connecting the circuit breaker grounding door interlocking plate 89.

[0062] The detailed chain process of this embodiment is as follows:

[0063] When the cabinet door 33 is not hung, the isolation mechanism 72 is in the grounding closing and isolation opening states, and the circuit breaker 91 is in the closing state. When the disconnector grounding operation position 7 is in the grounding closing state, the grounding interlocking plate 12 moves to the left and contacts the guide plate 77, pushing the guide plate 77 to move to the left. At this time, the locking piece 79 is removed from the first groove 52 on the upper rod 76, and there is a third spring 82 between the interlocking baffle 81 and the interlocking fixed plate 53. The third spring 82 plays a supporting role. At this time, the upper rod 76 will not move up and down, and the connecting plate 88 connected to it will not move up and down. The circuit breaker grounding lower door interlocking plate 89 fixed to the connecting plate 88 will also not move up and down, because the circuit breaker opening anti-locking plate 86 is fixed on the circuit breaker grounding lower door interlocking plate 89. Figure 2The position shown blocks the trip toggle plate 2, preventing personnel from mistakenly pressing the trip button and causing the trip coil 3 to hit the trip toggle plate 2, thereby tripping the circuit breaker.

[0064] Under the above circumstances, the cable room door hanging operation is performed, the first door hook 36 is connected and fixed to the center of the upper end surface of the lower cabinet door 33, and its U-shaped groove is inserted into the U-shaped door hook insertion groove 31, and the door hanging rod 87 is connected and fixed to the circuit breaker grounding lower door interlocking plate 89. When hanging the door, the door hanging rod 87 and the circuit breaker grounding lower door interlocking plate 89 are driven to move downward at the same time, and at this time, the connecting plate 88 and the upper rod 76 are moved downward at the same time. After the door is hung in place, the circuit breaker 91 is opened first. Only after the circuit breaker 91 is opened, the circuit breaker opening and closing cam 1 is rotated and is in a horizontal position. At this time, the first spring 4 has a downward force to pull down the circuit breaker three-position interlocking plate 85. Only then can the isolation mechanism 72 be operated. The opening operation of the disconnector grounding operation position 7 is performed first, and then the closing operation of the disconnector isolation operation position 6 is performed. After the grounding is opened, the grounding interlocking plate 12 moves to the right and separates from the guide plate 77. At this time, the second spring 51 acts to bounce the guide plate 77 back to its original position, so that the locking piece 79 is stuck in the first groove 52 on the upper rod 76. In this way, the upper rod cannot move up and down, and the cable room door (lower cabinet door 33) cannot be opened.

[0065] Then, the circuit breaker 91 is closed, so that the main shaft rotates and drives the circuit breaker opening and closing cam 1 to rotate 90 degrees clockwise, thereby causing the circuit breaker three-position interlocking plate 85 to move upward to block the isolation position selector plate 10 and the grounding position selector plate 11. At this time, any operation of the isolation mechanism 72 cannot be performed.

[0066] The second door hook 144 and the pad 38 on the cable room door (lower cabinet door 33) are fixed together on the upper left end face of the lower cabinet door 33, and the rivet bolt 143 is riveted on the upper frame plate of the cable room. After the door is hung, the round hole of the second door hook 144 is sleeved on the rivet bolt 143. When the grounding switch is opened, the isolation switch is closed, and the circuit breaker is closed, the cable room door ring-shaped door hook 144 can never exceed the upper surface of the rivet bolt 143. In this case, the cable room door can never be opened, ensuring the safety of the current operator.

[0067] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A locking device connecting the upper cabinet and the lower cabinet in an environmental protection cabinet, characterized in that: It includes a chain assembly connecting the upper cabinet and a connection assembly connecting the lower cabinet, the chain assembly includes a circuit breaker three-position chain plate, a first spring, a chain fixing plate, a circuit breaker grounding lower door interlock plate, a connection plate, a circuit breaker opening prevention chain plate, a door hanging rod and an upper rod, the connection assembly includes a third protrusion, a first door hanging buckle and a second door hanging buckle, and the chain fixing plate is fixed to the environmental protection cabinet; The bottom of the circuit breaker three-position interlocking plate rests on the first protrusion on the circuit breaker opening and closing cam in the environmental protection cabinet, and is also connected to the interlocking fixing plate via the first spring. When the first protrusion on the circuit breaker opening and closing cam is in a vertical state, the circuit breaker three-position interlocking plate is in a position to block the gate of the isolation mechanism in the upper cabinet; The circuit breaker grounded lower door interlock plate has a lower end connected to the anti-circuit breaker opening interlock plate and the door hanging rod, and an upper end connected to the connecting plate and the upper rod in sequence. The top also presses against the second protrusion on the circuit breaker opening and closing cam. The upper rod is inserted into the through hole on the interlock fixing plate. When the cabinet door is not hung, the upper rod is in a fixed state. At this time, the anti-circuit breaker opening interlock plate is located at a position that blocks the circuit breaker door. The bottom end of the door hanging rod is stuck in the first door hanging buckle, the first door hanging buckle is fixed to the upper end surface of the lower cabinet door, the second door hanging buckle is arranged on the upper end surface of the lower cabinet, the third protrusion is arranged on the bottom frame of the upper cabinet, and the second door hanging buckle is sleeved on the third protrusion.

2. The interlocking device for connecting the upper cabinet and the lower cabinet in the environmental protection cabinet according to claim 1, characterized in that: It also includes a third spring, a first locking mechanism and a second locking mechanism. A first groove and a second groove are provided on the upper rod from top to bottom. The first locking mechanism is connected to the isolation mechanism in the environmental protection cabinet. When the isolation mechanism is in the grounded closed state, the first locking mechanism is not located in the first groove. When the isolation mechanism is in the grounded open state, the first locking mechanism is located in the first groove. The second locking mechanism and the interlocking fixing plate are connected by a third spring. The third spring is in a vertical state, and the second locking mechanism is located in the second groove.

3. The interlocking device for connecting the upper cabinet and the lower cabinet in the environmental protection cabinet according to claim 1, characterized in that: The second door hook is provided with a hole having the same shape as the third protrusion, and the second door hook is sleeved on the third protrusion through the hole.

4. The interlocking device for connecting the upper cabinet and the lower cabinet in the environmental protection cabinet according to claim 1, characterized in that: The third protrusion is a pressure rivet bolt, and the second door hook is a ring-shaped door hook.

5. The interlocking device for connecting the upper cabinet and the lower cabinet in the environmental protection cabinet according to claim 1, characterized in that: It also includes a pad, which is arranged between the upper end surface of the lower cabinet and the second door hook.

6. The interlocking device for connecting the upper cabinet and the lower cabinet in the environmental protection cabinet according to claim 1, characterized in that: When the three-position interlocking plate of the circuit breaker is in the upper position, the first spring is in a stretched state; when the three-position interlocking plate of the circuit breaker is in the lower position, the first spring is in a normal state.

7. The interlocking device for connecting the upper cabinet and the lower cabinet in the environmental protection cabinet according to claim 2, characterized in that: The first locking mechanism includes a guide plate and a locking piece that are fixedly connected. The guide plate and the locking piece are stacked up and fixedly connected. The sum of the thicknesses of the guide plate and the locking piece is equal to the width of the first groove.

8. The interlocking device for connecting the upper cabinet and the lower cabinet in the environmental protection cabinet according to claim 2, characterized in that: The third spring connects the lower end of the second locking mechanism and the interlocking fixing plate.

9. The interlocking device for connecting the upper cabinet and the lower cabinet in the environmental protection cabinet according to claim 1, characterized in that: The third protrusion is higher than the second door hook in the vertical direction.

10. The interlocking device for connecting the upper cabinet and the lower cabinet in the environmental protection cabinet according to claim 1, characterized in that: When the first protrusion on the circuit breaker opening and closing cam is in a vertical state, the circuit breaker three-position interlocking plate is in an upper position, which is a position for blocking the gate of the isolation mechanism in the upper cabinet. When the first protrusion on the circuit breaker opening and closing cam is in a horizontal state, the circuit breaker three-position interlocking plate is in a lower position, which is a position for not blocking the gate of the isolation mechanism in the upper cabinet.

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