A lower door hard interlocking mechanism of a ring main unit and a ring main unit

Abstract

The invention discloses a lower door hard interlocking mechanism of a ring network cabinet and a ring network cabinet, and relates to the technical field of ring network cabinets, comprising an upper rotating rod, an upper bracket, a driving rod, a lower rotating rod, a lower bracket, a latch, an upper connecting rod assembly, a lower connecting rod assembly and a limit assembly; the lower rotating rod is rotatably connected to the lower door of the ring network cabinet through the lower bracket, and one end of the lower rotating rod is connected to the latch; an upper connecting rod assembly is arranged at one end of the upper rotating rod away from the driving rod, and a lower connecting rod assembly is arranged at one end of the lower rotating rod away from the latch; when the lower door is closed, the driving rod can drive the lower connecting rod assembly to move through the upper connecting rod assembly and thus control the movement of the latch; when the lower door is opened, the upper connecting rod assembly is separated from the lower connecting rod assembly, and the upper connecting rod assembly cannot move under the action of the limit assembly arranged inside the cabinet; the invention can ensure that when the lower door is opened, the operator will not make an error operation and thus drive the lower door hard interlocking mechanism to move downward.

Description

Technical Field

[0001] The present invention relates to the technical field related to ring network cabinets, and in particular to a lower door hard interlocking mechanism of a ring network cabinet and a ring network cabinet. Background Art

[0002] With the rapid development of the economy, the continuous emergence of high-rise buildings and large public buildings in cities has put higher and higher demands on the reliability of power supply. Many users require two or more power supplies. By establishing a distribution network based on a ring network structure, the reliability of power supply can be effectively improved, the continuity of power supply can be ensured, and the impact of distribution equipment failures and maintenance outages can be minimized. As an important equipment in the ring network operation mode, ring network cabinets are increasingly used in distribution network transformation.

[0003] The existing ring main unit interlocking can be divided into the following two categories:

[0004] 1. Soft connection: This type of interlock uses soft wire (such as nylon wire, steel wire, etc.) to connect the operating mechanism and the door lock;

[0005] 2. Hard connection: this type of interlocking operating mechanism and door panel use hard interlocking rods to achieve the locking function.

[0006] For example, the patent document with patent number CN113725023A discloses a hard interlocking mechanism for the lower door of a ring network cabinet and a ring network cabinet. When the lower door needs to be locked, the second connecting rod rotates counterclockwise around its rotation center under the action of external force, thereby driving the first connecting rod to move upward, and the first connecting rod pulls the third connecting rod to rotate counterclockwise around its rotation center, so that the bolt is inserted into the insertion hole of the lower door and locked with the lower door. Since the rotation centers of the second connecting rod and the third connecting rod are respectively positioned on the cabinet body or mechanism, there is no need to set a guide hole on the first connecting rod as in the prior art. In this way, the structure of the first connecting rod is not damaged and is not easily deformed. The width direction of the second connecting rod and the third connecting rod extends along the height of the cabinet body. When the operator drives the door hard interlocking mechanism to move downward when the lower door is not closed tightly, the width direction of the plate will be subjected to extrusion force. Since the width of the plate is much larger than its thickness, compared with the prior art, the second connecting rod and the third connecting rod are less likely to deform.

[0007] However, in actual use, the inventors found that when in use, the lower door is often not closed tightly (the socket and the latch are not aligned), and the operator drives the lower door hard interlock mechanism to move downward. Since the latch is against the top of the lower door and cannot move downward, the interlock mechanism and the lower door are damaged. In addition, there is another situation: when the lower door is in a fully open state, since the lower end of the latch is no longer protected by the limit of the lower door or the lower door socket, the operator may accidentally touch the hard interlock mechanism and drive the lower door hard interlock mechanism to move downward, which poses a certain safety hazard. Summary of the invention

[0008] In order to solve the defects in the prior art, the present invention provides a lower door hard interlocking mechanism of a ring network cabinet and a ring network cabinet.

[0009] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0010] The present invention provides a lower door hard interlocking mechanism of a ring main unit, comprising:

[0011] An upper rotating rod is rotatably connected to the cabinet body of the ring network cabinet through an upper bracket, and one end of the upper rotating rod is connected to a driving rod;

[0012] A lower rotating rod is rotatably connected to the lower door of the ring network cabinet through a lower bracket, and one end of the lower rotating rod is connected to a latch;

[0013] An upper connecting rod assembly is disposed at one end of the upper rotating rod away from the driving rod, and a lower connecting rod assembly is disposed at one end of the lower rotating rod away from the latch;

[0014] When the lower door is closed, the driving rod can drive the lower connecting rod assembly to move through the upper connecting rod assembly to control the movement of the latch;

[0015] When the lower door is opened, the upper connecting rod assembly is separated from the lower connecting rod assembly, and the upper connecting rod assembly cannot move due to the action of the limiting assembly arranged inside the cabinet.

[0016] As a preferred technical solution of the present invention, the upper connecting rod assembly includes an upper connecting rod portion rotatably connected to the upper rotating rod and an upper limit block fixedly arranged at the lower end of the upper connecting rod portion.

[0017] As a preferred technical solution of the present invention, the lower connecting rod assembly includes a lower connecting rod portion rotatably connected to the lower rotating rod, a lower limit block fixedly arranged at the upper end of the lower connecting rod portion, and a limit rod fixedly connected to the lower limit block;

[0018] The limiting rod is fixedly provided with a fixed ring on one end surface close to the upper limit block.

[0019] As a preferred technical solution of the present invention, the upper limit block is provided with a limit hole at a position corresponding to the limit rod.

[0020] As a preferred technical solution of the present invention, the limit assembly includes a reset spring fixedly arranged inside the cabinet and a plug rod fixedly connected to the reset spring;

[0021] When the lower door is opened, the insertion rod is inserted into the interior of the limiting hole under the action of the return spring, thereby limiting the upper connecting rod assembly.

[0022] As a preferred technical solution of the present invention, a through hole arranged along the axial direction of the lower connecting rod portion is further provided at one end of the limiting rod close to the inserting rod.

[0023] As a preferred technical solution of the present invention, the cabinet is further provided with a connecting component at a position corresponding to the through hole of the limiting rod, which is used to fix the limiting rod;

[0024] The connecting assembly includes a supporting plate fixed to the outside of the cabinet and a connecting rod fixedly arranged at the lower end of the supporting block and matched with the through hole.

[0025] As a preferred technical solution of the present invention, a support assembly is further provided on the lower connecting rod portion, which is used to prevent the insertion rod from moving toward the upper limit block;

[0026] The support assembly includes a fixed block fixedly arranged on the lower connecting rod portion, a buffer spring fixedly connected to the fixed block, and a support block fixedly arranged on the upper end of the buffer spring and slidably arranged with the lower connecting rod portion;

[0027] The distance between the support block and the limiting rod is smaller than the height of the insertion rod.

[0028] As a preferred technical solution of the present invention, a limit plate is fixedly provided at the rear end of the upper limit block, and a pressure sensing unit is provided at a position of the limit plate close to the lower limit block.

[0029] The present invention also provides a ring main unit, comprising the above-mentioned lower door hard interlocking mechanism.

[0030] The beneficial effects of the present invention are:

[0031] In the present invention, the upper rotating rod and the upper connecting rod assembly in the interlocking mechanism are connected to the cabinet body, and the lower rotating rod and the lower connecting rod assembly are connected to the lower door. After the lower door is opened, the limit rod in the lower connecting rod assembly will be separated from the upper limit block, and then the insertion rod in the limit assembly will be inserted into the inside of the limit block and play a role of limiting and supporting the upper connecting rod assembly. In this way, it can be ensured that when the lower door is opened, the operator will not make an error operation and thus drive the lower door hard interlocking mechanism to move downward;

[0032] In addition, another advantage of setting the interlocking mechanism as a split structure is that the lower rotating rod and the lower connecting rod assembly of the interlocking mechanism can be opened at the same time as the lower door is opened, which can reserve more space for the operator's maintenance work and facilitate the operator's maintenance operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0034] Figure 1 This is a schematic diagram of the planar structure of the ring network cabinet.

[0035] Figure 2 It is a schematic diagram of the planar structure of the hard interlocking mechanism.

[0036] Figure 3 Another structural schematic diagram of the hard interlocking mechanism.

[0037] Figure 4 for Figure 3 A local enlarged schematic diagram of point A in the middle.

[0038] Figure 5 It is a structural schematic diagram of the lower link assembly in the hard interlocking mechanism when it is opened.

[0039] Figure 6 for Figure 5 A local enlarged schematic diagram of point B in the middle.

[0040] Figure 7 It is a schematic diagram of the local structure of the hard interlocking mechanism.

[0041] Figure 8 Another partial structural schematic diagram of the hard interlocking mechanism.

[0042] Fig. 9 It is a schematic diagram of the partial side structure of the hard interlocking mechanism.

[0043] In the figure: 1. upper rotating rod; 11. upper bracket; 12. driving rod; 2. lower rotating rod; 21. lower bracket; 22. latch; 3. upper connecting rod assembly; 31. upper connecting rod part; 32. upper limit block; 321. limit hole; 4. lower connecting rod assembly; 41. lower connecting rod part; 42. lower limit block; 43. limit rod; 431. through hole; 44. fixed ring; 5. limit assembly; 51. reset spring; 52. plug rod; 6. connecting assembly; 61. support plate; 62. connecting rod; 7. support assembly; 71. fixed block; 72. buffer spring; 73. support block; 8. limit plate; 9. pressure sensing unit; 100. cabinet; 200. lower door. DETAILED DESCRIPTION

[0044] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0045] Embodiment 1

[0046] like Figure 1-Figure 3 As shown, a hard interlocking mechanism for the lower door of a ring network cabinet comprises an upper rotating rod 1, an upper bracket 11, a driving rod 12, a lower rotating rod 2, a lower bracket 21, a latch 22, an upper connecting rod assembly 3, a lower connecting rod assembly 4 and a limit assembly 5. The upper rotating rod 1 is rotatably connected to a cabinet body 100 of the ring network cabinet through the upper bracket 11, and one end of the upper rotating rod 1 is connected to the driving rod 12; the lower rotating rod 2 is rotatably connected to the lower door 200 of the ring network cabinet through the lower bracket 21, and one end of the lower rotating rod 2 is connected to the latch 22; the upper connecting rod assembly 3 is provided at one end of the upper rotating rod 1 away from the driving rod 12, and the lower connecting rod assembly 4 is provided at one end of the lower rotating rod 2 away from the latch 22;

[0047] When the lower door 200 is closed, the driving rod 12 can drive the lower connecting rod assembly 4 to move through the upper connecting rod assembly 3 and thus control the movement of the latch 22;

[0048] When the lower door 200 is opened, the upper connecting rod assembly 3 is separated from the lower connecting rod assembly 4, and the upper connecting rod assembly 3 cannot move due to the action of the limiting assembly 5 provided inside the cabinet 100.

[0049] The present invention provides an interlocking mechanism in which the upper rotating rod 1 and the upper connecting rod assembly 3 are connected to the cabinet 100, and the lower rotating rod 2 and the lower connecting rod assembly 4 are connected to the lower door 200. After the lower door 200 is opened, the limit rod 43 in the lower connecting rod assembly 4 will be separated from the upper limit block 32, and then the insertion rod 52 in the limit assembly 5 will be inserted into the inside of the limit block and play a role of limiting and supporting the upper connecting rod assembly 3. In this way, it can be ensured that when the lower door 200 is opened, the operator will not make a mistake in operation and thus drive the lower door hard interlocking mechanism to move downward. Through a simple and effective mechanical interlocking mechanism, it is ensured that the latch 22 can be stably locked when the lower door 200 is closed, thereby increasing safety.

[0050] In addition, another advantage of the interlocking mechanism being set as a split structure is that the lower rotating rod 2 and the lower connecting rod assembly 4 of the interlocking mechanism can be opened at the same time as the lower door 200 is opened, so that a larger space can be reserved for the maintenance work of the operator, which is convenient for the operator to perform maintenance operations.

[0051] In detail, one end of the upper rotating rod 1 is connected to the driving rod 12, which is responsible for transmitting the external operating power to the lower rotating rod 2. One end of the lower rotating rod 2 is connected to the latch 22, which is used to lock the lower door 200 when it is closed. The upper connecting rod assembly 3 and the lower connecting rod assembly 4 are respectively arranged at the far ends of the upper rotating rod 1 and the lower rotating rod 2. The upper connecting rod assembly 3 is responsible for transmitting the movement of the driving rod 12 to the lower connecting rod assembly 4 to realize the movement of the latch 22. In this way, when the lower door 200 is closed, the latch 22 can be pulled into a locked position to ensure the safety of the lower door 200. The design of the limit assembly 5 is intended to limit the movement of the upper connecting rod assembly 3 when the lower door 200 is opened, ensuring that it is stationary inside the cabinet 100. This design effectively prevents the upper connecting rod assembly 3 from affecting the state of the latch 22 due to movement when the lower door 200 is opened by mistake, thereby improving safety.

[0052] Further, if Figure 2-Figure 7 As shown, the upper connecting rod assembly 3 includes an upper connecting rod portion 31 rotatably connected to the upper rotating rod 1 and an upper limit block 32 fixedly arranged at the lower end of the upper connecting rod portion 31;

[0053] The lower connecting rod assembly 4 includes a lower connecting rod portion 41 rotatably connected to the lower rotating rod 2, a lower limit block 42 fixedly arranged at the upper end of the lower connecting rod portion 41, and a limit rod 43 fixedly connected to the lower limit block 42;

[0054] The upper limit block 32 defines a limit hole 321 at a position corresponding to the limit rod 43 .

[0055] The interlocking mechanism is realized by arranging the upper connecting rod assembly 3 to cooperate with the lower connecting rod assembly 4.

[0056] In detail, the design of the upper connecting rod assembly 3 not only ensures the movement direction of the upper connecting rod, but also provides important positioning guarantee for a series of mechanical actions through the upper limit block 32, thereby avoiding misoperation when the lower door 200 is not closed properly. The lower connecting rod assembly 4 ensures that in addition to the movement of the lower door 200 can guide the latch 22 to effectively lock, the limit system can also limit the movement of the lower connecting rod part 41 when the lower door 200 is opened, ensuring the safety and reliability of the interlocking mechanism. The limit hole 321 design of the upper limit block 32 adds physical restrictions to the upper connecting rod assembly 3, ensuring that the upper connecting rod will not be mismoved due to the operation of the lower door 200 when the lower door 200 is open, thereby avoiding safety hazards.

[0057] After closing the lower door 200 , the limiting rod 43 is inserted into the limiting hole 321 . At this time, the upper connecting rod portion 31 and the lower connecting rod portion 41 are connected. The movement of the lower connecting rod portion 41 can be driven by controlling the movement of the upper connecting rod portion 31 .

[0058] It should be noted that the limiting rod 43 is fixedly provided with a fixing ring 44 at one end surface close to the upper limit block 32. The purpose of such a setting is to ensure that the depth of the limiting rod 43 extending into the limiting hole 321 is fixed each time, that is, after the limiting rod 43 extends into the limiting hole 321, the fixing ring 44 is fitted with the end surface of the upper limit block 32, which also facilitates the subsequent accurate matching of the through hole 431 on the limiting rod 43 and the connecting rod 62.

[0059] In addition, since the lower connecting rod assembly 4 is arranged to rotate with the lower door 200, the movement trajectory of the limiting rod 43 is non-linear. In order to facilitate the limiting rod 43 to stably move inside the limiting hole 321, it is necessary to set the limiting hole 321 as a non-circular hole. Preferably, the limiting hole 321 is an elliptical hole, and its width W is greater than the outer diameter R of the limiting rod 43 (such as Figure 6 as shown).

[0060] Further, if Figure 8 As shown, the limit assembly 5 includes a return spring 51 fixedly arranged inside the cabinet 100 and an insertion rod 52 fixedly connected to the return spring 51;

[0061] When the lower door 200 is opened, the insertion rod 52 is inserted into the limiting hole 321 under the action of the return spring 51 , thereby limiting the upper connecting rod assembly 3 .

[0062] When the lower door 200 is opened, the combination design of the return spring 51 and the insertion rod 52 realizes the automatic insertion of the insertion rod 52 while achieving safety, so that the mechanism remains in a state of being ready for operation, reducing the potential failure rate;

[0063] When the lower door 200 is closed, the limiting rod 43 will push the insertion rod 52 to squeeze the return spring 51 again until the limiting rod 43 is completely inserted into the limiting hole 321 .

[0064] Further, if Figure 7-Figure 9 As shown, the end of the limiting rod 43 close to the inserting rod 52 is further provided with a through hole 431 arranged along the axis direction of the lower connecting rod portion 41;

[0065] The cabinet 100 is further provided with a connecting assembly 6 at a position corresponding to the through hole 431 of the limiting rod 43, which is used to fix the limiting rod 43;

[0066] The connecting assembly 6 includes a supporting plate 61 fixed to the outside of the cabinet 100 and a connecting rod 62 fixed to the lower end of the supporting block 73 and matched with the through hole 431 .

[0067] Among them, by setting the connecting assembly 6, it can be ensured that while controlling the upper connecting rod assembly 3 and the lower connecting rod assembly 4 to move upward synchronously, only part of the connecting rod 62 needs to be extended into the interior of the through hole 431 to achieve the connection and cooperation between the upper connecting rod assembly 3 and the lower connecting rod assembly 4, ensuring that the subsequent lower connecting rod assembly 4 opens with the opening of the lower door 200 during the movement. In this way, it is avoided that the operator accidentally opens the lower door 200 when controlling the interlocking mechanism, thereby causing the interlocking mechanism to fail.

[0068] The presence of the connecting assembly 6 further strengthens the stability of the limit rod 43. Its design enhances the fixing strength of the limit rod 43, ensuring that it will not loosen during multiple switching operations, improving stability during long-term use, and avoiding the easy separation of the lower connecting rod assembly 4 and the upper connecting rod assembly 3 due to the split structure of the interlocking mechanism, thereby ensuring the structural stability of the interlocking mechanism.

[0069] Further, if Figure 8-Figure 9 As shown, a support assembly 7 is also provided on the lower connecting rod portion 41, which is used to prevent the insertion rod 52 from moving toward the upper limit block 32;

[0070] The support assembly 7 includes a fixed block 71 fixedly disposed on the lower connecting rod portion 41, a buffer spring 72 fixedly connected to the fixed block 71, and a support block 73 fixedly disposed on the upper end of the buffer spring 72 and slidably disposed with the lower connecting rod portion 41;

[0071] The distance between the support block 73 and the limiting rod 43 is smaller than the height of the inserting rod 52 .

[0072] As can be seen from the above, when the lower door 200 is opened, the return spring 51 will drive the insertion rod 52 to move. However, when the upper connecting rod assembly 3 and the lower connecting rod assembly 4 move upward synchronously, the limiting rod 43 will gradually lose its limiting effect on the insertion rod 52. If the insertion rod 52 is not further limited, the insertion rod 52 will pop out again driven by the return spring 51, which will affect the subsequent downward resetting operation of the limiting rod 43. For this reason, by setting the support assembly 7, the support assembly 7 can be used to simultaneously support the insertion rod 52 while the limiting rod 43 moves upward, so as to prevent the insertion rod 52 from popping out under the action of the return spring 51.

[0073] In detail, the limit rod 43 and the support assembly 7 will synchronously follow the lower connecting rod part 41 to move upward. When moving upward, the side of the support block 73 in the support assembly 7 will abut against the end of the insertion rod 52, thereby replacing the limit rod 43 to continue to provide effective support for the insertion rod 52. At the same time, the through hole 431 on the limit rod 43 will pass through the connecting rod 62. Therefore, the upper end surface of the support block 73 will abut against the lower end surface of the connecting rod 62 and will no longer continue to move upward with the lower connecting rod part 41. Subsequently, the pressure applied to the support block 73 by the connecting rod 62 will be transmitted to the buffer spring 72 and drive the buffer spring 72 to compress, thereby ensuring the continued movement of the fixed block 71.

[0074] Further, if Figure 7 As shown, a limit plate 8 is fixedly provided at the rear end of the upper limit block 32 , and a pressure sensing unit 9 is provided at a position of the limit plate 8 close to the lower limit block 42 .

[0075] Among them, by setting the limit plate 8 at the rear end of the upper limit block 32 in combination with the pressure sensing unit 9, the opening state of the lower door 200 can be detected in real time, so that the mechanism can respond quickly under external interference, effectively avoid potential safety hazards, and can provide immediate feedback to the operator.

[0076] Optionally, an indicator light can be provided on the outer side of the lower door 200, and the indicator light is electrically connected to the pressure sensing unit 9 and controlled by the control module. When the lower limit block 42 touches the pressure sensing unit 9 (at this time, the fixed ring 44 is arranged in contact with the end surface of the upper limit block 32), the pressure sensing unit 9 sends a signal to the control module and controls the indicator light to emit a bright light (such as a green light). At this time, it is proved that the lower door 200 is in a fully closed state, and the operator can control the interlocking mechanism to perform the next step.

[0077] When the lower limit block 42 is away from the pressure sensing unit 9, the pressure sensing unit 9 sends a signal to the control module and controls the indicator light to emit a bright light of another color (such as red light). At this time, it proves that the lower door 200 is in an open state. The operator can judge whether the lower door 200 is completely closed by the color of the indicator light to ensure the normal use of the interlocking mechanism.

[0078] The design of the entire ring main unit integrates the above-mentioned lower door hard interlocking mechanism, which improves the safety and reliability of the ring main unit as a whole, especially in an environment where electrical equipment is frequently accessed or maintained, ensuring the safety of personnel operations.

[0079] Working process:

[0080] 1. Initial State

[0081] Before starting the device, all doors (upper door and lower door 200) are closed. At this time, the latch 22 is in a locked state to ensure that the lower door 200 cannot be opened accidentally. The entire mechanism is in a static state and is set to a safety mode.

[0082] 2. Lower door 200 closed

[0083] Closing behavior: when the lower door 200 is closed, the latch 22 is engaged with the lower end of the lower rotating rod 2, and the upper rotating rod 1 starts to rotate downward;

[0084] The latch 22 is locked: when the lower door 200 is completely closed, the latch 22 moves downward and is inserted into the locking hole of the lower door 200 to ensure that the lower door 200 is securely locked. This process ensures that the lower door 200 cannot be opened accidentally, preventing personnel from being harmed by electrical equipment during maintenance or operation.

[0085] 3. Lower door 200 opens

[0086] Operation starts: when the lower door 200 needs to be opened, the user can initiate a door opening request through a specific control device (such as a handle or a button), and at this time, the control device transmits an operation signal to the upper rotating rod 1.

[0087] Motion transmission: The upper rotating rod 1 starts to rotate due to the influence of the control signal, pushing the driving rod 12 connected thereto to move, thereby driving the lower rotating rod 2 to start rotating.

[0088] 4. Hard interlock release

[0089] Upper connecting rod action: The rotation of the upper rotating rod 1 causes the upper connecting rod assembly 3 to move, and transmits the action to the lower connecting rod assembly 4, which ultimately affects the state of the latch 22. Due to the movement of the lower rotating rod 2, the latch 22 automatically falls back to the unlocked position.

[0090] 5. Lower door 200 opens

[0091] The lower door 200 is fully opened: when the latch 22 is fully in the unlocked position, the user can easily open the lower door 200. At this time, due to the effective operation of the hard interlocking mechanism, the cooperative relationship between the upper connecting rod assembly 3 and the limit assembly 5 ensures the stability of the upper connecting rod assembly 3 when the lower door 200 is in the open state, effectively avoiding accidental closing caused by the external environment.

[0092] Limiting assembly 5: The limiting assembly 5 plays a key role in this process, preventing the upper connecting rod assembly 3 from malfunctioning when the lower door 200 is opened, and ensuring that the opening of the lower door 200 does not affect the state of the upper connecting rod assembly 3.

[0093] 6. Closing and relocking the lower door 200

[0094] Door closing operation: If the lower door 200 needs to be closed after the operation is completed, close the lower door 200 so that the fixed ring 44 is fitted with the end surface of the upper limit block 32, and then control the hard interlocking mechanism to work so that the latch 22 is inserted into the locking hole again.

[0095] Restore to initial state: At this time, the entire mechanism returns to the initial state to ensure that the interlocking mechanism is fully effective during the next restart operation.

[0096] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A hard interlocking mechanism for the lower door of a ring main unit, characterized in that: include: An upper rotating rod (1) is rotatably connected to a cabinet body (100) of a ring network cabinet via an upper bracket (11), and one end of the upper rotating rod (1) is connected to a driving rod (12); A lower rotating rod (2) is rotatably connected to a lower door (200) of the ring network cabinet via a lower bracket (21), and one end of the lower rotating rod (2) is connected to a latch (22); An upper connecting rod assembly (3) is provided at one end of the upper rotating rod (1) away from the driving rod (12), and a lower connecting rod assembly (4) is provided at one end of the lower rotating rod (2) away from the latch (22); When the lower door (200) is closed, the driving rod (12) drives the lower connecting rod assembly (4) to move via the upper connecting rod assembly (3), thereby controlling the movement of the latch (22); When the lower door (200) is opened, the upper connecting rod assembly (3) is separated from the lower connecting rod assembly (4), and the upper connecting rod assembly (3) cannot move under the action of a limit assembly (5) provided inside the cabinet (100); The upper connecting rod assembly (3) comprises an upper connecting rod portion (31) rotatably connected to the upper rotating rod (1) and an upper limit block (32) fixedly arranged at the lower end of the upper connecting rod portion (31); The lower connecting rod assembly (4) comprises a lower connecting rod portion (41) rotatably connected to the lower rotating rod (2), a lower limit block (42) fixedly arranged at the upper end of the lower connecting rod portion (41), and a limit rod (43) fixedly connected to the lower limit block (42); The limiting rod (43) is fixedly provided with a fixed ring (44) on one end surface close to the upper limit block (32); The upper limit block (32) is provided with a limit hole (321) at a position corresponding to the limit rod (43); The limiting assembly (5) comprises a return spring (51) fixedly arranged inside the cabinet (100) and an insertion rod (52) fixedly connected to the return spring (51); When the lower door (200) is opened, the insertion rod (52) is inserted into the interior of the limiting hole (321) under the action of the return spring (51), thereby limiting the upper connecting rod assembly (3).

2. A hard interlocking mechanism for the lower door of a ring main unit according to claim 1, characterized in that: An end of the limiting rod (43) close to the inserting rod (52) is also provided with a through hole (431) arranged along the axial direction of the lower connecting rod portion (41).

3. A lower door hard interlocking mechanism of a ring main unit according to claim 2, characterized in that: The cabinet (100) is further provided with a connecting assembly (6) at a position corresponding to the through hole (431) of the limiting rod (43), which is used to fix the limiting rod (43); The connection assembly (6) comprises a support plate (61) fixed to the outside of the cabinet (100) and a connection rod (62) fixedly arranged at the lower end of the support block (73) and arranged in cooperation with the through hole (431).

4. A lower door hard interlocking mechanism of a ring main unit according to claim 3, characterized in that: The lower connecting rod portion (41) is also provided with a support assembly (7) for preventing the insertion rod (52) from moving in a direction toward the upper limit block (32); The support assembly (7) comprises a fixed block (71) fixedly arranged on the lower connecting rod portion (41), a buffer spring (72) fixedly connected to the fixed block (71), and a support block (73) fixedly arranged on the upper end of the buffer spring (72) and slidably arranged with the lower connecting rod portion (41); The distance between the support block (73) and the limiting rod (43) is smaller than the height of the insertion rod (52).

5. The lower door hard interlocking mechanism of a ring main unit according to claim 1, characterized in that: A limit plate (8) is fixedly arranged at the rear end of the upper limit block (32), and a pressure sensing unit (9) is arranged at a position of the limit plate (8) close to the lower limit block (42).

6. A ring main unit, characterized in that: It comprises a lower door hard interlocking mechanism as described in any one of claims 1-5.

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