A frame circuit breaker contact self-lubricating mechanism

Abstract

This invention belongs to the field of electrical switch technology and discloses a self-lubricating mechanism for the contacts of a frame circuit breaker. The mechanism includes a frame circuit breaker body, within which a moving contact group is fixedly installed. During rotation, the moving contact group can contact and separate from the stationary contacts, thereby controlling the on / off state of the circuit in the frame circuit breaker. A moving contact support plate is fixedly installed on the moving contact group, and a rotating shaft is fixedly installed within the moving contact group. This invention utilizes a shaft seal lubrication assembly on the outside of the rotating shaft. The rotational energy of the shaft during the opening and closing swing of the moving contact group drives a spiral blade to synchronously push grease, ensuring continuous and uniform penetration of the grease into the hinged joint surface between the rotating shaft and the moving contact support plate. This achieves automatic and long-term lubrication of the shaft hinge, effectively solving the problems of high rotational resistance, mechanism jamming, and accelerated wear caused by long-term dry friction of the rotating shaft in existing technologies. It significantly reduces the frictional loss during the swing of the moving contact group, ensuring smooth and stable opening and closing operation of the moving contact group.

Description

Technical Field

[0001] This invention belongs to the field of electrical switch technology, specifically a self-lubricating mechanism for the contacts of a frame circuit breaker. Background Technology

[0002] Currently, frame circuit breakers (also known as universal circuit breakers) are the core protection and control equipment in low-voltage power distribution systems. They can connect, carry, and disconnect current under normal or fault conditions and are widely used in key areas such as industrial power distribution, building power supply, and new energy storage. The contact system of existing frame circuit breakers usually includes main contacts, arc contacts, and matching contact pressure springs. The main contacts are responsible for conducting normal operating current, while the arc contacts close first and separate later during the opening and closing process to withstand arc erosion and protect the main contacts from damage.

[0003] However, in the long-term operation of existing frame circuit breakers, the moving contact of the frame circuit breaker has a structure that swings in a fixed arc around a fixed axis. During opening and closing, there is continuous sliding friction and impact friction between the moving contact and the stationary contact. At the same time, the high-temperature arc generated when interrupting large currents can cause severe electrolytic corrosion to the contacts. Long-term operation can easily lead to wear of the silver plating layer on the contact surface, increased contact resistance, excessive temperature rise, and even contact welding, failure to open or close, and other faults. The existing frame circuit breaker contact lubrication methods mainly adopt two lubrication schemes. One is to regularly maintain and apply grease, and the other is to manually apply grease during equipment maintenance. The contact surface is coated with conductive grease, but in this solution, the grease is prone to rapid evaporation and carbonization failure due to the high temperature and electric arc of the contact. Not only can it not achieve long-term lubrication, but the carbonized impurities will also increase the contact resistance. The second solution is to use silver-graphite composite material to prepare the contact, which utilizes the self-lubricating properties of graphite to achieve material-level lubrication. However, this solution has an inherent contradiction between conductivity and lubricity. Excessive graphite content will sacrifice the current carrying capacity of the contact, and graphite has poor resistance to arc erosion, which cannot meet the requirements of high-current main contacts. Therefore, a self-lubricating mechanism for the contacts of a frame circuit breaker is designed to solve the above problems. Summary of the Invention

[0004] To address the problems mentioned in the background art, the present invention provides a self-lubricating mechanism for the contacts of a frame circuit breaker, comprising a frame circuit breaker body, wherein a moving contact assembly is fixedly installed in the frame circuit breaker body, the moving contact assembly being able to contact and separate from the stationary contacts during rotation to control the on / off state of the circuit in which the frame circuit breaker is located, a moving contact support plate is fixedly installed on the moving contact assembly, and a rotating shaft is fixedly installed in the moving contact assembly, the rotating shaft being movably connected to the inner side of the moving contact support plate, and further comprising... A shaft seal lubrication assembly is disposed outside the rotating shaft and is used to promote the lubrication of the movable connection between the rotating shaft and the moving contact support plate by grease; The shaft sealing lubrication assembly includes a sealing sleeve, which is fixedly installed outside the moving contact support plate, and the rotating shaft is located inside the sealing sleeve. An external lubrication assembly for moving contacts is provided on the moving contact group and is used to lubricate the contact friction points between the moving contact group and the stationary contact, thereby achieving lubrication protection during contact. The moving contact external lubrication assembly includes a grease spray box, which is disposed on the moving contact assembly. The bottom of the grease spray box is connected to a fixed tube, and the bottom of the fixed tube is connected to the top of the sealing sleeve. The grease inside the fixed tube is self-lubricated by a linkage grease pusher. The grease injection assembly, which is mounted on the moving contact support plate, is used to inject grease into the fixed tube and the sealing sleeve, facilitating grease injection.

[0005] Preferably, the shaft seal lubrication assembly further includes a fixing rod, which is fixedly connected to the rotating shaft. A helical blade is fixedly connected to the fixing rod, and the surface of the helical blade contacts the inner wall of the sealing sleeve.

[0006] Preferably, the linkage grease-dispensing component includes a push ring, a linkage rod rotatably connected to the push ring, the linkage rod being rotatably connected inside the push ring via a circular plate thereon, a pull plate movably connected to the linkage rod, a pull rod fixedly connected to the rotating shaft, the pull plate being sleeved on the pull rod for linkage operation, and the grease inlet and outlet inside the push ring being controlled by a one-way grease-dispensing component, which is used to deliver grease to the grease spray box in one direction.

[0007] Preferably, the one-way grease injection component includes a support rod, which is fixedly connected inside the push ring. A sealing block is sleeved on the support rod, and the sealing block is used to seal the grease inlet and outlet in the middle of the push ring.

[0008] Preferably, a torsion spring is fixedly connected to the support rod, and the other end of the torsion spring is connected to the sealing block.

[0009] Preferably, a rubber ring is fixedly connected to the surface of the push ring, and the surface of the rubber ring is in contact with the inner wall of the fixed tube.

[0010] Preferably, the grease injection assembly includes a grease injection tube connected to a fixed tube. A grease distribution box is fixedly installed on the frame circuit breaker body. The grease injection tube is connected to the grease distribution box. A miniature electric gear oil pump is connected to the grease distribution box. The two fixed tubes are interconnected by an interconnecting pipe.

[0011] Preferably, the grease injection tube is inserted into and communicates with the fixed tube, and a sealing ring is embedded in the fixed tube, with the outer surface of the grease injection tube in close contact with the inner surface of the sealing ring.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention provides a shaft seal lubrication assembly on the outside of the rotating shaft. By utilizing the rotational energy of the rotating shaft during the opening and closing swing of the moving contact assembly, the helical blades synchronously push grease, allowing the grease to continuously and evenly penetrate the hinged mating surface between the rotating shaft and the moving contact support plate. This achieves automatic and long-term lubrication of the rotating shaft hinge, effectively solving the problems of high rotational resistance, mechanism jamming, and accelerated wear caused by long-term dry friction of the rotating shaft in the prior art. It also significantly reduces the oscillating friction loss of the moving contact assembly, ensuring smooth and stable closing action of the moving contact assembly.

[0013] Furthermore, this invention adds an external lubrication component for the moving contacts to the existing shaft lubrication system. A mechanical linkage is formed between the moving contact assembly and the shaft, utilizing the kinetic energy of the moving contact assembly itself to achieve automatic quantitative grease delivery. This allows for precise grease supply to the contact friction area of ​​the moving and stationary contacts without the need for an additional independent drive source. Simultaneously, a unidirectional grease injection component ensures stable unidirectional grease delivery, preventing grease backflow and leakage. This replaces the inefficient manual periodic grease application method and avoids problems such as high-temperature carbonization of the grease and the conflict between the conductivity and lubricity of the silver graphite contacts. It effectively reduces sliding friction between the moving and stationary contacts, protects the silver plating layer of the moving contact assembly, stabilizes contact resistance, reduces the temperature rise of the moving contact assembly, significantly suppresses the risk of electrolytic corrosion and welding of the moving contact assembly, and improves the conductivity and breaking performance of the moving contact assembly.

[0014] Furthermore, this invention, based on the aforementioned dual automatic lubrication, incorporates an integrated grease injection assembly. A multi-phase unified grease supply circuit is formed through a grease distribution box, a micro-electric gear oil pump, and an interconnecting pipe. Combined with a sealing sleeve, sealing ring, and rubber ring, a fully sealed lubrication channel is constructed, achieving centralized replenishment, uniform distribution, and airtight storage of grease. This effectively prevents grease evaporation, contamination, and arc carbonization. Simultaneously, grease replenishment can be completed without disassembling the circuit breaker frame, significantly reducing maintenance difficulty and costs. This achieves continuous and stable lubrication of the contact system throughout its entire lifespan without disassembly, completely resolving the shortcomings of existing lubrication methods, such as short lifespan and difficult maintenance. It comprehensively improves the long-term stability, safety, and service life of the circuit breaker frame, eliminating serious faults such as failure to open or close caused by contact wear. Attached Figure Description

[0015] Figure 1 This is a perspective view of the present invention; Figure 2 This is a three-dimensional schematic diagram of the grease injection assembly of the present invention; Figure 3 This is an exploded three-dimensional schematic diagram of the moving contact assembly and the external lubrication component of the moving contact of the present invention; Figure 4 For the present invention Figure 3 Enlarged schematic diagram of the structure at point A in the middle; Figure 5 This is a three-dimensional schematic diagram of the shaft seal lubrication assembly of the present invention; Figure 6 This is a three-dimensional schematic diagram of the insertion of the grease injection tube and the sealing ring of the present invention; Figure 7 This is a three-dimensional exploded view of the linkage grease pushing component and the one-way grease injection component of the present invention.

[0016] In the diagram: 1. Frame circuit breaker body; 2. Moving contact assembly; 3. Moving contact support plate; 4. Rotating shaft; 5. Shaft seal lubrication assembly; 51. Sealing sleeve; 52. Fixing rod; 53. Spiral blade; 6. External lubrication assembly for moving contacts; 61. Grease spray box; 62. Fixing pipe; 63. Linkage grease pusher; 631. Push ring; 632. Linkage rod; 633. Pull plate; 634. Pull rod; 635. One-way grease injection component; 6351. Support rod; 6352. Sealing block; 7. Grease injection assembly; 71. Grease injection pipe; 72. Grease distribution box; 73. Miniature electric gear oil pump; 8. Torsion spring; 9. Rubber ring; 10. Sealing ring. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] like Figures 1 to 7 As shown, this invention provides a self-lubricating mechanism for the contacts of a frame circuit breaker, including a frame circuit breaker body 1. A moving contact group 2 is fixedly installed in the frame circuit breaker body 1. During rotation, the moving contact group 2 can contact and separate from the stationary contacts, thereby controlling the on / off state of the circuit in the frame circuit breaker. A moving contact support plate 3 is fixedly installed on the moving contact group 2. A rotating shaft 4 is fixedly installed in the moving contact group 2 and movably connected to the inner side of the moving contact support plate 3. The invention is characterized by further comprising... Shaft seal lubrication assembly 5 is disposed outside the rotating shaft 4 and is used to promote the lubrication of the movable connection between the rotating shaft 4 and the moving contact support plate 3 by grease. The shaft seal lubrication assembly 5 includes a sealing sleeve 51, which is fixedly installed outside the moving contact support plate 3, and the rotating shaft 4 is located inside the sealing sleeve 51. The moving contact external lubrication assembly 6 is disposed on the moving contact group 2 and is used to lubricate the contact friction points between the moving contact group 2 and the stationary contact to achieve lubrication protection during contact. The moving contact external lubrication assembly 6 includes a grease spray box 61, which is installed on the moving contact assembly 2. The bottom of the grease spray box 61 is connected to a fixed tube 62, and the bottom of the fixed tube 62 is connected to the top of the sealing sleeve 51. The grease inside the fixed tube 62 is pushed and self-lubricated by a linkage grease pusher 63. Grease injection assembly 7 is mounted on the moving contact support plate 3 and is used to inject grease into the fixed tube 62 and the sealing sleeve 51, making grease injection convenient.

[0019] Specifically, this invention utilizes the coordinated operation of the shaft seal lubrication assembly 5, the moving contact external lubrication assembly 6, and the grease injection assembly 7. The shaft seal lubrication assembly 5 provides basic lubrication and protection at the hinge of the rotating shaft 4 of the moving contact assembly 2; the moving contact external lubrication assembly 6 provides precise lubrication of the contact friction surfaces of the moving contact assembly 2; and the grease injection assembly 7 provides unified grease replenishment for the entire system. These three components form a linked lubrication function, simultaneously solving the two major technical problems of shaft 4 wear and moving contact assembly 2 contact surface wear without manual intervention. This replaces the traditional manual grease application method, ensuring stable lubrication of the moving contact assembly 2 system at all times. (The last sentence appears to be incomplete and possibly refers to the circuit breaker body 1.) As this invention pertains to the original structure of the frame circuit breaker, the structural improvement of the moving contact group 2 area is only made to the frame circuit breaker. Further details are omitted here. It should be noted that the grease spray box 61 is the core output component for lubricating the moving contact group 2. A rectangular nozzle is provided at the bottom of the grease spray box 61. After the fixed tube 62 injects grease into the grease spray box 61, the grease can be evenly sprayed onto the surface of the moving contact group 2 through the bottom rectangular nozzle, precisely covering the contact friction area between the moving contact group 2 and the stationary and moving contacts. This achieves directional lubrication protection of the contact surface of the moving contact group 2, effectively reducing the risk of contact wear and electrolytic corrosion of the moving contact group 2.

[0020] like Figures 3 to 5 As shown, the shaft seal lubrication assembly 5 also includes a fixing rod 52, which is fixedly connected to the rotating shaft 4. A spiral blade 53 is fixedly connected to the fixing rod 52. The surface of the spiral blade 53 contacts the inner wall of the sealing sleeve 51. It is used to drive the spiral blade 53 to push the grease inside the sealing sleeve 51 with the kinetic energy of the rotating shaft 4, so that the grease can penetrate into the movable connection between the rotating shaft 4 and the movable contact support plate 3 for lubrication and protection.

[0021] Specifically, when the moving contact assembly 2 swings during opening and closing, it drives the rotating shaft 4 to rotate synchronously. The rotating shaft 4 drives the spiral blade 53 to rotate circumferentially along the inner wall of the sealing sleeve 51 through the fixed rod 52. The rotating spiral blade 53 generates an axial pushing force, which continuously pushes and permeates the grease in the sealing sleeve 51 into the hinge gap between the rotating shaft 4 and the moving contact support plate 3. This structure does not require an external power source and achieves self-driven lubrication by utilizing the movement of the moving contact assembly 2 itself, completely eliminating the dry friction problem of the rotating shaft 4, reducing rotational resistance, and preventing the mechanism from jamming. At the same time, the sealing sleeve 51 can isolate external dust and arc impurities, prevent grease contamination and failure, and extend the service life of the rotating shaft 4.

[0022] like Figures 4 to 7 As shown, the linkage grease-pushing component 63 includes a push ring 631, a linkage rod 632 rotatably connected to the push ring 631, the linkage rod 632 being rotatably connected to the inside of the push ring 631 via a circular plate on it, a pull plate 633 movably connected to the linkage rod 632, and a pull rod 634 fixedly connected to the rotating shaft 4. The pull plate 633 is sleeved on the pull rod 634 and operates in linkage. The inside of the push ring 631 controls the entry and exit of grease through a one-way grease-injecting component 635, which is used to deliver grease to the grease spray box 61 in one direction.

[0023] Specifically, when the rotating shaft 4 rotates, it drives the pull rod 634 to perform a circular motion. The pull rod 634, through the pull plate 633, pulls the linkage rod 632 to perform a reciprocating linear motion, which in turn drives the push ring 631 to perform a reciprocating push-pull motion along the inner wall of the fixed tube 62. When the push ring 631 moves forward, it squeezes the grease in the fixed tube 62, and in conjunction with the one-way grease injection part 635, it pushes the grease in a direction to the grease spray box 61. During the return stroke, the grease is replenished through the inlet and outlet on the push ring 631. It should be noted that the linkage rod 632... The circular plate and the linkage rod 632 are welded together. The circular plate is used to axially limit the linkage rod 632 to prevent it from falling out of the push ring 631. This structure realizes the mechanical linkage between the movement of the rotating shaft 4 and the lubrication of the moving contact group 2. It achieves one-time opening and closing of the switch and one-time quantitative grease replenishment, accurately controlling the grease supply and avoiding excessive grease accumulation or insufficient supply. No additional drive device is required. It realizes adaptive quantitative lubrication of the contact friction surface of the moving contact group 2, effectively reducing the sliding wear and contact resistance of the moving contact group 2.

[0024] like Figure 7 As shown, the one-way grease injection component 635 includes a support rod 6351, which is fixedly connected to the inside of the push ring 631. A sealing block 6352 is sleeved on the support rod 6351, and the sealing block 6352 is used to seal the grease inlet and outlet in the middle of the push ring 631.

[0025] Specifically, when the push ring 631 pushes the grease in the fixed tube 62 forward and then resets, the grease pressure below the push ring 631 squeezes the sealing block 6352 rotating around the support rod 6351, causing the inlet and outlet on the push ring 631 to open. After the grease passes through the push ring 631 in one direction, after the push ring 631 pushes the grease forward again, the grease in the fixed tube 62 can flow directly to the grease spray box 61. When the push ring 631 returns, the sealing block 6352 resets and closes the inlet and outlet, blocking the reverse flow of grease. This structure is precisely matched with the linkage grease pusher 63, and the unidirectional directional delivery of grease is achieved through pressure-triggered opening and closing, completely eliminating the problem of grease backflow and leakage, and ensuring that grease can be effectively supplied to the friction surface of the moving contact group 2 with each grease push action.

[0026] like Figure 7 As shown, a torsion spring 8 is fixedly connected to the support rod 6351, and the other end of the torsion spring 8 is connected to the sealing block 6352.

[0027] Specifically, the torsion spring 8 provides a constant reset force for the sealing block 6352. When there is no grease pushing pressure, the sealing block 6352 automatically drives the sealing block 6352 to tightly close the inlet and outlet of the push ring 631, realizing automatic sealing under no external force, further enhancing the one-way check effect, preventing grease leakage under static or vibrating conditions, and ensuring the sealing performance of the lubrication channel and the stability of grease storage.

[0028] like Figures 4 to 5 As shown, a rubber ring 9 is fixedly connected to the surface of the push ring 631, and the surface of the rubber ring 9 is in contact with the inner wall of the fixed tube 62.

[0029] Specifically, the rubber ring 9 fills the assembly gap between the push ring 631 and the inner wall of the fixed tube 62, forming a sealed grease-pushing structure to prevent grease from leaking from the gap. This ensures that the push ring 631 can form a complete squeezing force on the grease in the fixed tube 62 when it reciprocates, so that the grease is pushed evenly and stably in a directional manner, improving the accuracy of quantitative grease supply and eliminating the problem of uneven grease supply.

[0030] like Figures 1 to 3 As shown, the grease injection assembly 7 includes a grease injection pipe 71, which is connected to a fixed pipe 62. A grease distribution box 72 is fixedly installed on the frame circuit breaker body 1. The grease injection pipe 71 is connected to the grease distribution box 72. A miniature electric gear oil pump 73 is connected to the grease distribution box 72. The two fixed pipes 62 are connected to each other through an interconnecting pipe.

[0031] Specifically, the miniature electric gear oil pump 73 provides replenishment power, delivering external grease to the grease distribution box 72. The grease distribution box 72 distributes the grease evenly to each fixed pipe 62 through the grease injection pipe 71. The interconnecting pipes enable balanced grease flow between multiple fixed pipes 62, ensuring consistent grease reserves throughout the system. This structure achieves centralized mechanized grease replenishment, eliminating the need to disassemble the frame circuit breaker body 1 to complete grease replenishment, significantly reducing maintenance difficulty, while ensuring a continuous grease supply to the shaft seal lubrication assembly 5 and the moving contact external lubrication assembly 6.

[0032] like Figure 6 As shown, the grease injection tube 71 is inserted into and connected to the fixed tube 62. A sealing ring 10 is embedded in the fixed tube 62, and the outer surface of the grease injection tube 71 is in close contact with the inner surface of the sealing ring 10.

[0033] Specifically, the sealing ring 10 achieves a seamless seal at the joint between the grease injection tube 71 and the fixed tube 62, preventing leakage during grease replenishment. At the same time, the plug-in connection structure simplifies the assembly and disassembly process of the parts, reduces the difficulty of equipment production and assembly and the cost of subsequent maintenance and disassembly, and improves the ease of assembly and sealing reliability.

[0034] The working process of the technical solution provided by this invention is as follows: In this invention, the micro electric gear oil pump 73 in the grease injection assembly 7, connected to an external grease input pipe, delivers the injected grease to the grease distribution box 72. The grease is then evenly distributed to each fixed pipe 62 and sealing sleeve 51 via the grease injection pipe 71 and the interconnecting pipe, completing the system grease replenishment. During the opening and closing of the frame circuit breaker body 1, the moving contact assembly 2 drives the rotating shaft 4 to rotate around the moving contact support plate 3. As the rotating shaft 4 rotates, the fixed rod 52 drives the spiral blades 53 to rotate circumferentially within the sealing sleeve 51. The spiral blades 53 axially push the grease to the hinge gap of the rotating shaft 4, achieving self-lubrication of the rotating shaft 4. Simultaneously, the rotating shaft 4 drives the pulling rod 634 to perform circumferential motion, which is then linked by the pulling plate 633 and the linkage rod 632. The moving ring 631 reciprocates axially within the fixed tube 62. When the moving ring 631 moves forward, it cooperates with the sealing block 6352 to squeeze the grease, pushing the grease into the grease spray box 61. The grease is then evenly sprayed out through the rectangular nozzle at the bottom of the grease spray box 61, precisely applying it to the contact friction surfaces of the moving contact group 2 and the stationary moving contact group 2. When the moving ring 631 is reset by the reaction force of the moving rod during opening and closing, the grease below the moving ring 631 pushes open the sealing block 6352, allowing the grease to be transported upward in one direction. This achieves self-drive opening and closing of the moving contact group 2, and synchronous automatic lubrication of the rotating shaft 4 and the moving contact group 2 in two areas. No manual intervention is required throughout the process, ensuring stable and long-term lubrication protection of the moving contact group 2.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0036] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A self-lubricating mechanism for contacts of a frame circuit breaker, comprising a frame circuit breaker body (1), wherein a moving contact assembly (2) is fixedly installed in the frame circuit breaker body (1), the moving contact assembly (2) being able to contact and separate from the stationary contact during rotation to achieve control over the on / off state of the circuit in which the frame circuit breaker is located, a moving contact support plate (3) is fixedly installed on the moving contact assembly (2), and a rotating shaft (4) is fixedly installed in the moving contact assembly (2), the rotating shaft (4) being movably connected to the inner side of the moving contact support plate (3), characterized in that, Also includes Shaft seal lubrication assembly (5), which is disposed outside the rotating shaft (4) and is used to promote the lubrication of the grease at the movable connection between the rotating shaft (4) and the movable contact support plate (3); The shaft sealing lubrication assembly (5) includes a sealing sleeve (51), which is fixedly installed outside the moving contact support plate (3), and the rotating shaft (4) is located inside the sealing sleeve (51). External lubrication assembly (6) for moving contacts is provided on the moving contact group (2) and is used to lubricate the contact friction points between the moving contact group (2) and the stationary contact to achieve lubrication protection during contact. The moving contact external lubrication assembly (6) includes a grease spray box (61), which is disposed on the moving contact assembly (2). The bottom of the grease spray box (61) is connected to a fixed tube (62), and the bottom of the fixed tube (62) is connected to the top of the sealing sleeve (51). The grease inside the fixed tube (62) is pushed and self-lubricated by a linkage grease pusher (63). Grease injection assembly (7), which is set on the moving contact support plate (3), is used to inject grease into the fixed tube (62) and the sealing sleeve (51) for convenient grease injection.

2. The self-lubricating mechanism for contacts of a frame circuit breaker according to claim 1, characterized in that: The shaft seal lubrication assembly (5) also includes a fixing rod (52), which is fixedly connected to the rotating shaft (4). A spiral blade (53) is fixedly connected to the fixing rod (52), and the surface of the spiral blade (53) is in contact with the inner wall of the sealing sleeve (51).

3. The self-lubricating mechanism for contacts of a frame circuit breaker according to claim 1, characterized in that: The linkage grease-pushing component (63) includes a push ring (631), a linkage rod (632) is rotatably connected to the push ring (631), the linkage rod (632) is rotatably connected to the inside of the push ring (631) through a circular plate on it, a pull plate (633) is movably connected to the linkage rod (632), a pull rod (634) is fixedly connected to the rotating shaft (4), the pull plate (633) is sleeved on the pull rod (634) and operates in linkage. The inside of the push ring (631) controls the entry and exit of grease through a one-way grease-injecting component (635), which is used to deliver grease to the grease spray box (61) in one direction.

4. The self-lubricating mechanism for contacts of a frame circuit breaker according to claim 3, characterized in that: The one-way grease injection component (635) includes a support rod (6351), which is fixedly connected to the inside of the push ring (631). A sealing block (6352) is sleeved on the support rod (6351), and the sealing block (6352) is used to seal the grease inlet and outlet in the middle of the push ring (631).

5. The self-lubricating mechanism for contacts of a frame circuit breaker according to claim 4, characterized in that: A torsion spring (8) is fixedly connected to the support rod (6351), and the other end of the torsion spring (8) is connected to the sealing block (6352).

6. The self-lubricating mechanism for contacts of a frame circuit breaker according to claim 3, characterized in that: A rubber ring (9) is fixedly connected to the surface of the push ring (631), and the surface of the rubber ring (9) is in contact with the inner wall of the fixed tube (62).

7. The self-lubricating mechanism for contacts of a frame circuit breaker according to claim 6, characterized in that: The grease injection assembly (7) includes a grease injection tube (71), which is connected to a fixed tube (62). A grease distribution box (72) is fixedly installed on the frame circuit breaker body (1). The grease injection tube (71) is connected to the grease distribution box (72). A miniature electric gear oil pump (73) is connected to the grease distribution box (72). The two fixed tubes (62) are connected to each other through an interconnecting pipe.

8. The self-lubricating mechanism for contacts of a frame circuit breaker according to claim 7, characterized in that: The grease injection tube (71) is inserted into and communicates with the fixed tube (62). A sealing ring (10) is embedded in the fixed tube (62). The outer surface of the grease injection tube (71) is in close contact with the inner surface of the sealing ring (10).

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