Connecting structure and circuit breaker chassis truck

Abstract

The invention discloses a connecting structure and a circuit breaker chassis truck, and relates to the field of circuit breaker chassis trucks. The pushing assembly is connected with the chassis truck and is used for horizontally moving; the swinging assembly is movably arranged on the pushing assembly and used for changing the movement track of the pushing assembly; the push rod is arranged between the swing assembly and the chassis truck; the pushing assembly, the swing assembly and the push rod are connected to the chassis truck to prolong the distance and prevent the internal structure of the chassis truck from being broken. The moving direction of the push rod is the vertical direction, transverse component force cannot be generated, and therefore the service life of the push rod is effectively prolonged.

Description

Technical Field

[0001] The present invention relates to the field of circuit breaker chassis vehicles, in particular to a connection structure and a circuit breaker chassis vehicle. Background Art

[0002] The VB2-12 circuit breaker, a core component of the medium-voltage power grid, suffered from mechanical failures in its chassis, which had a long-term impact on power system reliability. The original design flaws manifested themselves in the following aspects: The lateral push rod was subjected to lateral bending stress, resulting in a stress concentration factor of 3.2, exceeding the fatigue limit of 40Cr alloy steel (σ-1 = 350 MPa), causing periodic fracture. The positioning sleeve was made of ABS plastic, which has a shear strength of only 25 MPa. This made it susceptible to brittle fracture after long-term operation, leading to misaligned positioning of the chassis. Statistics show that mechanical failures in the circuit breaker have caused numerous unplanned power outages, resulting in significant direct economic losses and operational risks for personnel. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is that the transverse push rod in the connection structure of the existing circuit breaker chassis is subjected to lateral bending stress, which causes periodic fracture.

[0004] The above technical problem is solved by the following technical solution: The present invention proposes a connection structure, which includes a chassis vehicle.

[0005] The pushing assembly is connected to the chassis for horizontal movement.

[0006] The swing component is movably arranged on the pushing component and is used to change the motion trajectory of the pushing component.

[0007] A push rod is arranged between the swing assembly and the chassis vehicle.

[0008] The pushing assembly, the swing assembly and the push rod are connected to the chassis to extend the distance and prevent the internal structure of the chassis from being broken.

[0009] In a preferred embodiment of the connection structure of the present invention: the pushing component includes a connecting plate slidably arranged on the chassis, and a fixing portion arranged on the chassis, and the connecting plate is provided with a first strip hole for slidingly cooperating with the fixing portion.

[0010] In a preferred embodiment of the connection structure described in the present invention: the fixing part includes a limit block arranged on the chassis vehicle, and a fixing bolt arranged on the limit block, the limit block is provided with a through opening for the connecting plate to pass through, and the first strip hole is located in the through opening, and the bottom end of the fixing bolt fits into the first strip hole.

[0011] In a preferred embodiment of the connection structure described in the present invention: the swing assembly includes a first swing plate movably connected to the connecting plate, and the first swing plate is provided with a second strip hole for sliding limitation with the connecting plate, a second swing plate is arranged on the first swing plate, and a fixed shaft is provided on the chassis vehicle and movably connected to the connection between the first swing plate and the second swing plate.

[0012] In a preferred embodiment of the connection structure of the present invention: the pushing assembly further includes a fixing column provided on the connection plate, and the fixing column fits through the second strip-shaped hole.

[0013] In a preferred embodiment of the connection structure of the present invention, the length of the first strip-shaped hole is greater than the diameter of the fixing bolt, and the length of the second strip-shaped hole is greater than the diameter of the fixing column.

[0014] In a preferred embodiment of the connecting structure described in the present invention: the first swing plate includes a horizontal section provided with the second strip-shaped hole, a side-by-side section located above the horizontal section and distributed side by side with the horizontal section in the horizontal direction, and a connecting section connected to the second swing plate, one end of the connecting section is connected to the horizontal section, and the other end of the connecting section is connected to the side-by-side section.

[0015] In a preferred embodiment of the connection structure of the present invention, the first swing plate and the second swing plate are perpendicular to each other.

[0016] To solve the above technical problems, the present invention also proposes a circuit breaker chassis vehicle, which also includes a chassis vehicle, the chassis vehicle includes a chassis, a closing interlock plate arranged on the chassis, and a connecting block arranged between the closing interlock plate and the connecting plate.

[0017] In a preferred embodiment of the circuit breaker chassis vehicle of the present invention: the closing interlock plate is made of stainless steel.

[0018] The beneficial effects of the present invention are: zero mechanical failures for 18 consecutive months, and the average trouble-free time extended from 800 hours to 8,000 hours, thereby improving the reliability of the chassis vehicle; the annual maintenance cost was reduced from 120,000 yuan / unit to 25,000 yuan / unit, and the investment payback period was only 9 months; it passed the type test and the mechanical life test reached 112,000 times, thereby improving safety; due to the reduction in failures, 42 tons of CO2 emissions were saved annually, with a significant emission reduction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings of the embodiments of the present invention. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention. Among them:

[0020] Figure 1 Shows a schematic diagram of the overall structure of the connection structure of the present invention;

[0021] Figure 2 It shows a schematic structural diagram of the pushing component in the connection structure of the present invention;

[0022] Figure 3 A schematic structural diagram of a swing assembly in the connection structure of the present invention is shown;

[0023] Figure 4 The original structural diagram of the circuit breaker chassis is shown;

[0024] Figure 5 The schematic structural diagram of the circuit breaker chassis vehicle of the present invention is shown. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below with reference to specific embodiments and the accompanying drawings.

[0026] The terms used in the present invention are those commonly used in the art in view of the functions of the present invention, but these terms may vary according to the intentions of those skilled in the art, precedents, or new technologies in the art. In addition, specific terms may be selected by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the present invention. Therefore, the terms used in the specification should not be understood as simple names, but rather as the meanings of the terms and the overall description of the present invention.

[0027] Reference Figure 1 , this embodiment provides a connection structure, including a chassis vehicle 4.

[0028] The pushing assembly 1 is connected to the chassis 4 for horizontal movement.

[0029] Swing assembly 2 is movably mounted on push assembly 1 and is used to change the motion trajectory of push assembly 1, thereby changing the horizontal motion trajectory of push assembly 1 into an arc-shaped motion trajectory. The horizontal motion distance of the arc-shaped motion trajectory is negligible and acts as a vertical force component for swing assembly 2.

[0030] The push rod 3 is provided between the swing assembly 2 and the chassis 1 and is used for directly pressing the switch of the chassis.

[0031] The pushing assembly 1 , the swinging assembly 2 and the push rod 3 are connected to the chassis 4 to extend the distance to prevent the internal structure of the chassis 4 from being broken.

[0032] The preparations for these improvements included: 1. Establishing a mechanical model for the longitudinal push rod: The longitudinal layout ensures that push rod 3 is subjected only to axial pressure, increasing the critical buckling load to 12kN (compared to 3kN in the original transverse configuration). ANSYS modal analysis verified that the first-order natural frequency was increased from 82Hz to 215Hz, avoiding the operating mechanism excitation frequency (50-150Hz). 2. Modular interface design: Based on dimensional chain tolerance analysis, a standard interface component (ISO 2768-mK level accuracy) was developed to ensure compatibility between the new chassis and the existing CT20 spring mechanism. The finite life design method is adopted, and it is predicted according to Miner's cumulative damage theory that the residual strength after 100,000 operations will still remain above 85%; III. Technical implementation path: ① Material selection: Use software to simulate the mechanical properties of 304 stainless steel under working conditions of -40℃~120℃, and determine the heat treatment process (solution treatment 1050℃×1h); ② Structural optimization: Use the TRIZ contradiction matrix to decouple the lateral force contradiction and invent a patented longitudinal guide rail structure; ③ Process control: Use laser cladding technology to enhance the surface hardness of the push rod (HRC58), and reduce the friction coefficient to 0.15.

[0033] like Figure 2 As shown, the pushing assembly 1 includes a connecting plate 11 slidably mounted on the chassis, and a fixing portion 12 mounted on the chassis. The connecting plate 11 is provided with a first strip-shaped hole 111 for slidingly engaging with the fixing portion 12. The fixing portion 12 can limit the movement direction of the connecting plate 11. The movement of the connecting plate 11 causes the first swing plate 21 to drive the second swing plate 22 to swing around the fixed axis 23. The end of the second swing plate 22 away from the fixed axis 23 pushes the push rod 3 to move in the vertical direction, thereby pushing the travel switch to open and close, so that the swing of the originally set lateral push rod is converted into the rotation of the swing assembly 2. The arrangement of the connecting plate 11 and the first swing plate 21 makes the rotation arc of the end of the second swing plate 22 smaller. Therefore, the movement direction of the push rod 3 is the vertical direction, and no lateral force component is generated, thereby effectively extending the service life of the push rod 3.

[0034] like Figure 2 As shown, the fixing portion 12 includes a stopper 121 provided on the chassis, and a fixing bolt 122 provided on the stopper 121. The stopper 121 has a through opening for the connecting plate 11 to pass through, and the first strip hole 111 is located within the through opening. The bottom end of the fixing bolt 122 fits into the first strip hole 111. The fixing portion 12 can limit the movement direction of the connecting plate 11.

[0035] As an optional embodiment, the swing assembly 2 includes a first swing plate 21 movably connected to the connecting plate 11, and the first swing plate 21 is provided with a second bar hole 211 for sliding limitation with the connecting plate 11, a second swing plate 22 arranged on the first swing plate 21, and a fixed shaft 23 arranged on the chassis vehicle and movably connected to the connection between the first swing plate 21 and the second swing plate 22; and in the initial state, the angle between the first swing plate 21 and the connecting plate 11 is an acute angle.

[0036] As an optional embodiment, the pushing assembly 1 further includes a fixing post 13 provided on the connecting plate 11, and the fixing post 13 fits through the second strip hole 211. The fitting of the fixing post 13 and the second strip hole 211 enables a sliding setting, so that the swing assembly 2 swings.

[0037] As an optional embodiment, the length of the first strip-shaped hole 111 is greater than the diameter of the fixing bolt 122, and the length of the second strip-shaped hole 211 is greater than the diameter of the fixing post 13. Pulling the connecting plate 11 causes the fixing bolt 122 to continue sliding within the first strip-shaped hole 111, thereby achieving the restricted movement of the connecting plate 11. The movement of the fixing post 13 within the second strip-shaped hole 211 regulates the rotation of the swing assembly 2, allowing the second swing plate 22 to swing smoothly at the end away from the fixing post 13.

[0038] like Figure 3 As shown, the first swing plate 21 includes a horizontal section 2111 having a second strip-shaped hole 211, a side-by-side section 2112 located above the horizontal section 2111 and horizontally parallel to the horizontal section 2111, and a connecting section 2113 connected to the second swing plate 22. One end of the connecting section 2113 is connected to the horizontal section 2111, and the other end of the connecting section 2113 is connected to the side-by-side section 2112. The connecting section 2113 connects the horizontal section 2111 and the side-by-side section 2112 of different heights, thereby adjusting the height of the second swing plate 22 connected to the side-by-side section 2112.

[0039] As an optional embodiment, the first swing plate 21 and the second swing plate 22 are perpendicular to each other. This perpendicularity ensures that when the first swing plate 21 drives the second swing plate 22 to swing, the end of the second swing plate 22 connected to the push rod 3 moves in an arc-shaped trajectory. The first and second strip holes 111, 211 act to cushion the movement of the connecting plate 11, reducing the mechanical energy generated by the connecting plate 11.

[0040] In summary, when the connecting plate 11 moves, the fixing bolt 122 slides in the first strip hole 111, and the fixing column 13 slides in the second strip hole 211, so that the connecting plate 11 drives the first swing plate 21 to swing, and the second swing plate 22 connected to the first swing plate 21 continues to swing around the fixed axis 23, pushing the push rod 3 set on the second swing plate 22 to push and open the switch; through the arrangement of the first strip hole 111 and the second strip hole 211, the force of the first swing plate 21 acting on the second swing plate 22 is reduced, and the force directly acting on the push rod 3 is reduced, so that the force applied to the push rod 3 is reduced; the push rod 3 was originally directly swung by the force, and the switch is formed by swinging and pushing the end of the push rod 3 away from the second swing plate 22. At this time, during the swinging and pushing of the push rod 3, the force applied to the travel switch includes a vertical component and a lateral component, so that both ends of the push rod 3 are subjected to force. Under the action of the lateral bending stress, the push rod 3 periodically breaks.

[0041] In summary, through the above improvements, there have been zero mechanical failures for 18 consecutive months, and the MTBF (mean time between failures) has been extended from 800 hours to 8,000 hours. The annual maintenance cost has been reduced from 120,000 yuan per unit to 25,000 yuan per unit, with a payback period of only 9 months. The mechanical life test has passed type testing and reached 112,000 times (IEC 62271-100 requires 10,000 times). Due to the reduction in failures, 42 tons of CO2 emissions are saved annually (equivalent to a reduction of 280,000 kWh in electricity loss).

[0042] like Figure 4 and Figure 5 As shown, based on the above connection structure, this embodiment provides a circuit breaker chassis, which also includes a chassis 4. The chassis 4 includes a chassis 41, a closing interlock plate 42 disposed on the chassis 41, and a connecting block 43 disposed between the closing interlock plate 42 and the connecting plate 11. When the chassis 4 is in operation, the closing interlock plate 42 drives the connecting plate 11 to move, and the connection plate 11 then drives the connecting block 43 to move, thereby causing the first swing plate 21 and the second swing plate 22 to swing about the fixed axis 23, thereby realizing the operation of the connection structure.

[0043] As an optional embodiment, the closing interlock plate 42 is made of stainless steel. 304 stainless steel (yield strength 205 MPa) is used to replace the plastic closing interlock plate 42. Through thickness optimization (5 mm) and interference fit design (tolerance H7 / p6), the shear bearing capacity is increased from 1.2 kN to 4.8 kN. The contact stress distribution is calculated using Hertz contact theory to ensure that no plastic deformation occurs under the impact of a 40 kA short-circuit current. The mechanical properties of 304 stainless steel under -40 ° C to 120 ° C working conditions are simulated by software to determine the heat treatment process (solution treatment 1050 ° C × 1 h).

[0044] Finally, it should be pointed out that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways without departing from the scope of the present invention.

Claims

1. A connection structure, characterized in that: include, Chassis vehicle (4); A propulsion assembly (1) connected to the chassis (4) for horizontal movement; a swing component (2) movably arranged on the pushing component (1) and used for changing the motion trajectory of the pushing component (1); as well as A push rod (3) is arranged between the swing assembly (2) and the chassis (1); The pushing assembly (1), the swinging assembly (2) and the push rod (3) are connected to the chassis (4) to extend the spacing and prevent the internal structure of the chassis (4) from being broken.

2. The connection structure according to claim 1, wherein: The pushing assembly (1) comprises a connecting plate (11) slidably arranged on the chassis, and a fixing portion (12) arranged on the chassis, wherein the connecting plate (11) is provided with a first strip-shaped hole (111) for slidingly cooperating with the fixing portion (12).

3. The connection structure according to claim 2, wherein: The fixing portion (12) comprises a limiting block (121) provided on the chassis vehicle, and a fixing bolt (122) provided on the limiting block (121); the limiting block (121) is provided with a through opening for the connecting plate (11) to pass through, and the first strip-shaped hole (111) is located in the through opening, and the bottom end of the fixing bolt (122) is fitted into the first strip-shaped hole (111).

4. The connection structure according to claim 3, characterized in that: The swing assembly (2) comprises a first swing plate (21) movably connected to the connecting plate (11), the first swing plate (21) being provided with a second strip-shaped hole (211) for slidingly limiting with the connecting plate (11), a second swing plate (22) arranged on the first swing plate (21), and a fixed shaft (23) arranged on the chassis and movably connected to the connection between the first swing plate (21) and the second swing plate (22).

5. The connection structure according to claim 4, characterized in that: The pushing assembly (1) further comprises a fixing column (13) arranged on the connecting plate (11), and the fixing column (13) fits through the second strip-shaped hole (211).

6. The connection structure according to claim 5, characterized in that: The length of the first strip-shaped hole (111) is greater than the diameter of the fixing bolt (122), and the length of the second strip-shaped hole (211) is greater than the diameter of the fixing column (13).

7. The connection structure according to claim 6, characterized in that: The first swing plate (21) comprises a horizontal section (2111) provided with the second strip-shaped hole (211), a side-by-side section (2112) located above the horizontal section (2111) and distributed side by side with the horizontal section (2111) in a horizontal direction, and a connecting section (2113) connected to the second swing plate (22), wherein one end of the connecting section (2113) is connected to the horizontal section (2111), and the other end of the connecting section (2113) is connected to the side-by-side section (2112).

8. The connection structure according to claim 7, characterized in that: The first swing plate (21) and the second swing plate (22) are perpendicular to each other.

9. A circuit breaker chassis, characterized by: The invention comprises the connection structure according to any one of claims 1 to 8, and further comprises a chassis vehicle (4), wherein the chassis vehicle (4) comprises a chassis (41), a closing interlock plate (42) arranged on the chassis (41), and a connecting block (43) arranged between the closing interlock plate (42) and the connecting plate (11).

10. The circuit breaker chassis vehicle according to claim 9, characterized in that: The closing interlock plate (42) is made of stainless steel.

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