A three-position load switch

Abstract

The present invention relates to the technical field of power switches, and discloses a three-position load switch, comprising a switch body, a conductive contact and a grounding contact arranged on the switch body, and a contact knife assembly arranged on the switch body, and also comprising a stabilizing assembly arranged on the switch body for stabilizing the movement of the contact knife assembly, and a limit mechanism arranged inside the stabilizing assembly; the contact knife assembly comprises a movable contact knife. The three-position load switch can quickly and accurately lock the movable contact knife through this arrangement, and enable the contact knife to stop moving immediately and accurately when reaching the closing, opening or grounding position, avoiding poor contact or mechanical damage caused by overshoot or undershoot, and the precise stop position also helps to extend the service life of the equipment, reduce the replacement frequency and cost, and at the same time, the three-position load switch has achieved significant improvements in stability, accuracy and durability, providing a strong guarantee for the safe and stable operation of the power system.

Description

Technical Field

[0001] The invention belongs to the technical field of power switches, and in particular relates to a three-position load switch. Background Art

[0002] In the power system, load switches, as key distribution and control equipment, are widely used in load control and protection of generator sets, substations, transmission lines and distribution systems. As an advanced device integrating connection, disconnection and grounding functions, the stability and reliability of the performance of three-position load switches are crucial to the safe operation of the power system.

[0003] However, although the design of the traditional three-position load switch meets the basic on-off function requirements to a certain extent, there are still significant deficiencies in the design of its transmission part. Specifically, during the switch operation, the transmission mechanism needs to accurately transmit the operating force to the contact system to achieve the switching of the closing, opening and grounding positions, and the transmission part of the traditional three-position load switch often lacks a fine limit mechanism, which results in that under the action of the drive mechanism, it is difficult to accurately control the stop position of the contact knife when it moves to the target position, which may cause additional vibration and impact due to overshoot or failure to be in place, thereby affecting the stable combination between the contact knife and the contact. The stable combination of the contact knife and the contact is the key to ensuring the electrical performance of the load switch. This unstable combination may not only lead to poor circuit contact, increase resistance and heat, but also accelerate the wear of the contacts, and may even cause mechanical or electrical failures, posing a safety hazard; therefore, there are deficiencies and cannot meet its use requirements. Therefore, it is necessary to further improve it.

[0004] Therefore, in view of this, the existing structure and defects are studied and improved, and a three-position load switch is provided to achieve a more practical purpose. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a three-position load switch, which is achieved by the following specific technical means:

[0006] A three-position load switch, comprising a switch body, a conductive contact and a grounding contact arranged on the switch body, and a contact knife assembly arranged on the switch body, further comprising a stabilizing assembly arranged on the switch body for stabilizing the movement of the contact knife assembly, and a limiting mechanism arranged inside the stabilizing assembly;

[0007] The contact blade assembly includes a moving contact blade, and the moving contact blade is in contact with the conductive contact to realize the conduction of the closing circuit, the moving contact blade is separated from the conductive contact to realize the disconnection of the opening circuit, and the moving contact blade is in contact with the grounding contact to realize the grounding position and perform circuit grounding protection;

[0008] The stabilizing component includes a stabilizing shell arranged on the left and right sides of the switch body, the limiting mechanism includes a limiting seat fixedly assembled on the inner wall of the stabilizing shell, a fixed base block is fixedly installed on the limiting seat, and limiting components are arranged on both sides of the fixed base block, a limiting block for limiting the movement of the moving contact knife is fixedly assembled on the limiting component, a buffer component for limiting and buffering the moving contact knife is arranged on the fixed base block, a through pipe rack is fixedly assembled in the limiting block, and a damping component for force unloading and buffering is arranged on the through pipe rack, and the bottom of the through pipe rack is connected to the buffer component through a connecting hose, and when the transmission position of the moving contact knife is limited by the limiting block, the buffer component is used to perform preliminary force unloading and buffering on the force of the moving contact knife during transmission, and the damping fluid inside the buffer component is driven to be injected into the damping component to further unload and buffer the force of the moving contact knife transmission.

[0009] As a further description of the above technical solution: when the moving contact knife moves to the target position, the limit assembly is used to push the limit block to limit and clamp the moving contact knife. Through this setting, the moving contact knife can be quickly and accurately locked to prevent it from continuing to move or deviate, and the contact knife can immediately and accurately stop moving when it reaches the closing, opening or grounding position, avoiding poor contact or mechanical damage caused by overshoot or undershoot, and the precise stop position also helps to extend the service life of the equipment and reduce replacement frequency and cost. At the same time, the three-position load switch has achieved significant improvements in stability, accuracy and durability, providing a strong guarantee for the safe and stable operation of the power system.

[0010] Furthermore, the knife contact assembly also includes a knife contact seat fixedly mounted on the switch body, a connecting pin is fixedly mounted on the knife contact seat, and the knife contact seat is movably connected to the movable knife contact via the connecting pin.

[0011] As a further description of the above technical solution: through the setting of the moving contact knife, it can be responsible for realizing the three operating states of circuit closing, opening and grounding protection, and it can be flexibly switched in different states to meet various needs of the power system.

[0012] Furthermore, the switch body is provided with a transmission assembly for driving the movable contact knife, the transmission assembly includes a fixed frame fixedly mounted on the switch body, the fixed frame is provided with an electric retractor and a movable arm, the electric retractor is movably assembled with the fixed frame through a first movable pin shaft, and the movable arm is movably assembled with the fixed frame through a second movable pin shaft;

[0013] Wherein, the piston rod of the electric telescopic device is fixedly connected to the movable arm, and one end of the movable arm away from the second movable pin is fixedly connected to the stabilizing rod.

[0014] As a further description of the above technical solution: this setting can drive the moving contact knife to perform opening and closing operations, ensuring that the operating instructions can be accurately transmitted to the moving contact knife, so that the moving contact knife can move according to the predetermined trajectory and position, thereby realizing precise control of the circuit.

[0015] Furthermore, the stabilizing shell is fixedly assembled with the switch body through a fixed bracket, a stabilizing rod is arranged between the stabilizing shells, the left and right ends of the stabilizing rod pass through the movable contact knife and extend to the interior of the stabilizing shell, a stabilizing groove is opened inside the stabilizing shell, and a stabilizing slider is arranged inside the stabilizing groove, and one side of the stabilizing slider is fixedly connected to the stabilizing rod.

[0016] As a further description of the above technical solution: This setting can enable the moving touch knife to resist the interference of external vibration and impact during movement, and maintain a high degree of consistency in its motion trajectory, thereby effectively enhancing the moving touch knife's ability to resist vibration and deviation during movement, and ensuring the accuracy and stability of the moving touch knife's trajectory.

[0017] Furthermore, an insulating sleeve is provided on the outer periphery of the stabilizing rod, and the stabilizing rod is fixedly assembled with the movable contact blade via the insulating sleeve.

[0018] As a further description of the above technical solution: the provision of the insulating sleeve can play an insulating role and further improve the safety of the equipment.

[0019] Furthermore, the limiting assembly includes a limiting base plate fixedly mounted on the limiting seat, a support block is fixedly mounted on one side of the limiting base plate, a first support rod is rotatably mounted on the support block, a support seat is rotatably mounted on one end of the first support rod away from the support block, and an upper surface of the support seat is fixedly connected to the limiting block;

[0020] A limiting slide bar is fixedly installed between the support block and the buffer assembly, a limiting slider is slidably installed on the limiting slide bar, a second support rod is movably connected between the limiting slider and the first support rod, a supporting spring is provided on the outer periphery of the limiting slide bar, and the supporting spring is located between the limiting slider and the buffer assembly.

[0021] As a further description of the above technical solution: through this setting, the moving contact knife can be quickly and accurately locked to prevent it from continuing to move or deviating, and the contact knife can immediately and accurately stop moving when it reaches the closing, opening or grounding position.

[0022] Furthermore, an active chamber is provided inside the limiting sliding rod, and an active groove is provided on the top wall of the active chamber.

[0023] As a further description of the above technical solution: the applicability of the equipment can be improved by setting up an active chamber and an active groove.

[0024] Further, the buffer assembly includes a buffer shell fixedly assembled on the fixed base block, a buffer capsule is arranged inside the buffer shell, and damping fluid is arranged inside the buffer capsule, a movable plate is arranged on one side of the buffer capsule, a buffer rod is fixedly installed on the side of the movable plate away from the buffer capsule, one end of the buffer rod away from the movable plate extends into the movable chamber of the limit sliding rod and is fixedly connected to the buffer block, and the top of the buffer block passes through the movable groove and is fixedly connected to the limit sliding block;

[0025] The buffer assembly also includes a connecting tube fixedly assembled on the fixed base block, one end of the connecting tube extends to the interior of the buffer shell and is fixedly connected to the buffer capsule, and one end of the connecting tube away from the buffer capsule is fixedly connected to a connecting hose.

[0026] As a further description of the above technical solution: through this setting, the impact force of the moving touch knife during transmission can be absorbed and dispersed, thereby reducing the impact force directly acting on the moving touch knife, achieving the purpose of preliminary unloading of the impact force, and at the same time protecting the moving touch knife from damage.

[0027] Further, the damping assembly includes a damping shell fixedly assembled on the limit block, a damping capsule is arranged inside the damping shell, a damping plate is arranged on the upper side of the damping capsule, a damping rod is fixedly installed on the upper side of the damping plate, the upper end of the damping rod extends to the outside of the damping shell, and a damping spring is sleeved on the outer periphery of the damping rod;

[0028] Wherein, one end of the through-tube frame extends to the interior of the damping shell and is fixedly connected to the damping bag.

[0029] As a further description of the above technical solution: the damping force of the damping fluid inside the damping bag can deeply unload and dissipate the residual impact force of the moving contact knife, and finally achieve a smooth connection between the moving contact knife and the conductive contact and the grounding contact.

[0030] Furthermore, a damping plate for limiting clamping is provided on the limiting clamping block, and one side of the damping plate is fixedly connected to the damping rod, wherein inclined surfaces are provided on the left and right sides of the limiting clamping block.

[0031] As a further description of the above technical solution: when the stabilizing slider contacts the limit block, it will first contact its inclined surface, thereby pressing the limit block downward, so that the two relative limit blocks are separated from each other, and the setting of the inclined surface is conducive to the limit clamping of the stabilizing slider.

[0032] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0033] 1. The three-position load switch uses the contact knife assembly, the limit assembly and the limit card block in coordination. When the moving contact knife moves to the target position, the limit assembly is used to push the limit card block to limit and clamp the moving contact knife. This setting can quickly and accurately lock the moving contact knife to prevent it from continuing to move or deviate, and enable the contact knife to stop moving immediately and accurately when it reaches the closing, opening or grounding position, avoiding poor contact or mechanical damage caused by overshoot or undershoot, and the precise stop position also helps to extend the service life of the equipment and reduce the replacement frequency and cost. At the same time, the three-position load switch has achieved significant improvements in stability, accuracy and durability, providing a strong guarantee for the safe and stable operation of the power system.

[0034] 2. The three-position load switch cooperates with the knife contact assembly, the limit assembly and the buffer assembly. A damping liquid is provided inside the buffer capsule. The viscous resistance of the liquid medium of the damping liquid is utilized to effectively attenuate the kinetic energy of the moving machinery, absorb and disperse the impact force during the transmission of the moving knife contact, thereby reducing the impact force directly acting on the moving knife contact, achieving the purpose of preliminary unloading of the impact force, and protecting the moving knife contact from damage.

[0035] 3. The three-position load switch cooperates with the contact knife assembly, the limit assembly, the buffer assembly and the damping assembly. When the position of the stable slider is limited by the limit block, the shock-absorbing plate and the stable slider are in contact with each other at the same time, and the damping force of the damping fluid inside the damping bag can deeply unload and dissipate the residual impact force of the moving contact knife, and finally realize the smooth combination between the moving contact knife and the conductive contact and the grounding contact. The dual effects of the buffer assembly and the damping assembly greatly alleviate the impact force generated during the transmission of the moving contact knife, further protect the moving contact knife from damage, and extend the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0037] Figure 1 It shows a schematic diagram of an overall three-dimensional structure provided according to an embodiment of the present invention;

[0038] Figure 2 A schematic diagram of the installation structure of the transmission assembly and the knife contact assembly provided in an embodiment of the present invention is shown;

[0039] Figure 3 It shows a schematic diagram of the overall structure of a transmission assembly provided according to an embodiment of the present invention;

[0040] Figure 4 A schematic diagram of the installation structure of the stabilizing shell and the stabilizing rod provided in an embodiment of the present invention is shown;

[0041] Figure 5 A schematic diagram of the installation structure of the stabilizing shell and the limiting mechanism provided in an embodiment of the present invention is shown;

[0042] Figure 6 It shows a schematic diagram of the overall structure of a limiting mechanism provided in an embodiment of the present invention;

[0043] Figure 7 A schematic diagram of the installation structure of the limit seat and the limit assembly provided in an embodiment of the present invention is shown;

[0044] Figure 8 A schematic diagram of the installation structure of the fixed base block and the buffer assembly provided in an embodiment of the present invention is shown;

[0045] Fig. 9 A schematic diagram of the installation structure of the limit sliding rod and the limit sliding block provided in an embodiment of the present invention is shown;

[0046] Fig.10 A schematic diagram of the internal structure of a buffer assembly provided according to an embodiment of the present invention is shown;

[0047] Fig.11 A schematic diagram of the installation structure of the limit block and the damping assembly provided in an embodiment of the present invention is shown;

[0048] Fig.12 A schematic diagram of the installation structure of a through pipe rack and a damping assembly provided in an embodiment of the present invention is shown;

[0049] Fig.13 A schematic diagram of the internal structure of a damping assembly provided in an embodiment of the present invention is shown;

[0050] Fig.14 A schematic diagram of a closing area, an opening area and a grounding area provided according to an embodiment of the present invention is shown.

[0051] Legend:

[0052] 10. Switch body; 11. Conductive contact; 12. Grounding contact;

[0053] 20. Knife contact assembly; 21. Knife contact seat; 22. Connecting pin; 23. Moving knife contact;

[0054] 30. Transmission assembly; 31. Fixed frame; 32. Electric telescopic device; 321. First movable pin; 33. Movable arm; 331. Second movable pin;

[0055] 40. Stable assembly; 41. Stable shell; 411. Fixed bracket; 42. Stable rod; 421. Insulating sleeve; 43. Stable slider; 44. Stable slide groove;

[0056] 50. Limiting mechanism; 51. Limiting seat; 52. Fixed base block; 53. Limiting assembly; 531. Limiting base plate; 532. Support block; 533. First support rod; 534. Support seat; 535. Limiting slide rod; 5351. Active chamber; 5352. Active groove; 536. Limiting slide block; 537. Second support rod; 538. Support spring; 54. Limiting block; 541. Inclined surface; 542. Shock-absorbing plate; 55. Buffering assembly; 551. Buffering shell; 552. Buffering capsule; 553. Active plate; 554. Buffering rod; 555. Buffering block; 556. Connecting pipe; 56. Connecting hose; 57. Through pipe rack; 58. Damping assembly; 581. Damping shell; 582. Damping capsule; 583. Damping plate; 584. Damping rod; 585. Damping spring. DETAILED DESCRIPTION

[0057] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0058] See also Figures 1 to 14A three-position load switch comprises a switch body 10, a conductive contact 11 and a grounding contact 12 arranged on the switch body 10, and a contact knife assembly 20 arranged on the switch body 10, and also comprises a stabilizing assembly 40 arranged on the switch body 10 for stabilizing the movement of the contact knife assembly 20, and a limiting mechanism 50 arranged inside the stabilizing assembly 40; the contact knife assembly 20 comprises a movable contact knife 23, and the movable contact knife 23 is contacted with the conductive contact 11 to realize the closing circuit conduction, and the movable contact knife 23 is separated from the conductive contact 11 to realize the opening circuit cutoff, and the movable contact knife 23 is moved to the conductive contact 11. The stabilizing component 40 includes a stabilizing shell 41 arranged on the left and right sides of the switch body 10, and the limiting mechanism 50 includes a limiting seat 51 fixedly mounted on the inner wall of the stabilizing shell 41, and a fixed base block 52 is fixedly mounted on the limiting seat 51. The fixed base block 52 has limiting components 53 arranged on both sides, and the limiting component 53 is fixedly mounted with a limiting block 54 for limiting the movement of the moving contact knife 23. The fixed base block 52 is provided with a buffer component 55 for limiting the moving contact knife 23. The limiting block 54 is fixedly mounted with a limiting block 54 for limiting the movement of the moving contact knife 23. The through-tube frame 57 is provided with a damping assembly 58 for force unloading and buffering. The bottom of the through-tube frame 57 is connected to the buffer assembly 55 through a connecting hose 56. When the transmission position of the movable contact knife 23 is limited by the limit block 54, the buffer assembly 55 is used to perform preliminary force unloading and buffering on the force of the movable contact knife 23 during transmission, and the damping fluid inside the buffer assembly 55 is driven to be injected into the damping assembly 58 to further unload and buffer the force of the movable contact knife 23 during transmission; when the movable contact knife 23 moves to the target position, the limit assembly 53 is used to push the limit block 54 to move the movable contact knife 23 to the target position. 4. The movable contact knife 23 is limited and clamped. Through this setting, the movable contact knife 23 can be quickly and accurately locked to prevent it from continuing to move or deviating, and the contact knife can immediately and accurately stop moving when it reaches the closing, opening or grounding position, avoiding poor contact or mechanical damage caused by overshoot or undershoot, and the precise stop position also helps to extend the service life of the equipment and reduce the replacement frequency and cost. At the same time, the three-position load switch has achieved significant improvements in stability, accuracy and durability, providing a strong guarantee for the safe and stable operation of the power system.

[0059] See also Figure 1 to Figure 2 The contact knife assembly 20 also includes a contact knife seat 21 fixedly mounted on the switch body 10, and a connecting pin 22 is fixedly mounted on the contact knife seat 21. The contact knife seat 21 is movably connected to a moving contact knife 23 through the connecting pin 22; the setting of the moving contact knife 23 can be responsible for realizing the three operating states of circuit closing, opening and grounding protection, and enable it to be flexibly switched in different states to meet various needs of the power system.

[0060] See also Figures 1 to 3The switch body 10 is provided with a transmission assembly 30 for driving the movable contact knife 23. The transmission assembly 30 includes a fixed frame 31 fixedly assembled on the switch body 10, and an electric retractor 32 and a movable arm 33 are arranged on the fixed frame 31. The electric retractor 32 is movably assembled with the fixed frame 31 through a first movable pin shaft 321, and the movable arm 33 is movably assembled with the fixed frame 31 through a second movable pin shaft 331; wherein, the piston rod of the electric retractor 32 is fixedly connected with the movable arm 33, and one end of the movable arm 33 away from the second movable pin shaft 331 is fixedly connected with the stabilizing rod 42; the electric retractor 32 is started by program control, and the movable arm 33 is pushed to move by the piston rod of the electric retractor 32, and the stabilizing rod 42 is driven to move synchronously by the movable arm 33, and the movable contact knife 23 is driven by the stabilizing rod 42 to perform the opening and closing operation, so as to ensure that the operation instruction can be accurately transmitted to the movable contact knife 23, so that the movable contact knife 23 can move according to the predetermined trajectory and position, thereby realizing the precise control of the circuit.

[0061] See also Figures 2 to 5 The stabilizing shell 41 is fixedly assembled with the switch body 10 through a fixing bracket 411, and a stabilizing rod 42 is arranged between the stabilizing shells 41. The left and right ends of the stabilizing rod 42 penetrate the moving contact knife 23 and extend to the inside of the stabilizing shell 41. A stabilizing groove 44 is provided inside the stabilizing shell 41, and a stabilizing slider 43 is arranged inside the stabilizing groove 44. One side of the stabilizing slider 43 is fixedly connected with the stabilizing rod 42. When the moving contact knife 23 moves, the stabilizing rod 42 is used to drive the stabilizing slider 43 to slide synchronously in the stabilizing groove 44, so that the moving contact knife 23 can resist the interference of external vibration and impact during the movement, and maintain the high consistency of its motion trajectory, thereby effectively enhancing the anti-vibration and anti-deviation capabilities of the moving contact knife 23 during the movement, and ensuring the accuracy and stability of the trajectory of the moving contact knife 23.

[0062] See also Figure 2 An insulating sleeve 421 is provided on the outer periphery of the stabilizing rod 42, and the stabilizing rod 42 is fixedly assembled with the movable contact blade 23 through the insulating sleeve 421; the setting of the insulating sleeve 421 can play an insulating role.

[0063] See also Figures 5 to 8The limiting assembly 53 includes a limiting base plate 531 fixedly assembled on the limiting seat 51, a support block 532 is fixedly installed on one side of the limiting base plate 531, a first support rod 533 is rotatably installed on the support block 532, a support seat 534 is rotatably installed on the end of the first support rod 533 away from the support block 532, and the upper surface of the support seat 534 is fixedly connected to the limiting block 54; a limiting slide bar 535 is fixedly installed between the support block 532 and the buffer assembly 55, a limiting slider 536 is slidably installed on the limiting slider 535, and the limiting slider 536 and the first support rod 533 are movable between A second support rod 537 is connected, and a support spring 538 is provided on the outer periphery of the limit slide rod 535, and the support spring 538 is located between the limit slide block 536 and the buffer assembly 55; when the movable contact knife 23 moves to the target position, the limit assembly 53 is used to push the limit block 54 to limit and clamp the movable contact knife 23. Through this arrangement, the movable contact knife 23 can be quickly and accurately locked to prevent it from continuing to move or deviating, and the contact knife can immediately and accurately stop moving when it reaches the closing, opening or grounding position, avoiding poor contact or mechanical damage caused by overshoot or undershoot.

[0064] See also Figures 9 and 10 An active chamber 5351 is provided inside the limiting slide bar 535 , and an active groove 5352 is provided on the top wall of the active chamber 5351 ; the applicability of the device can be improved by providing the active chamber 5351 and the active groove 5352 .

[0065] See also Figures 7 to 10 The buffer assembly 55 includes a buffer shell 551 fixedly assembled on the fixed base block 52, a buffer capsule 552 is arranged inside the buffer shell 551, and a damping fluid is arranged inside the buffer capsule 552, a movable plate 553 is arranged on one side of the buffer capsule 552, a buffer rod 554 is fixedly installed on the side of the movable plate 553 away from the buffer capsule 552, and the end of the buffer rod 554 away from the movable plate 553 extends into the movable chamber 5351 of the limiting slide bar 535 and is fixedly connected to the buffer block 555, and the top of the buffer block 555 passes through the movable groove 5352 and is fixedly connected to the limiting slide block 536; the buffer assembly 55 also includes a fixed A connecting tube 556 is fixedly mounted on the fixed base block 52, one end of the connecting tube 556 extends to the interior of the buffer shell 551 and is fixedly connected to the buffer capsule 552, and the end of the connecting tube 556 away from the buffer capsule 552 is fixedly connected to the connecting hose 56; by providing a damping liquid in the buffer capsule 552, the viscous resistance of the damping liquid as a liquid medium is utilized to effectively attenuate the kinetic energy of the moving machinery, absorb and disperse the impact force of the moving contact knife 23 during transmission, thereby reducing the magnitude of the impact force directly acting on the moving contact knife 23, achieving the purpose of preliminary unloading of the impact force, and protecting the moving contact knife 23 from damage.

[0066] See also Figures 11 to 13The damping assembly 58 includes a damping shell 581 fixedly assembled on the limit block 54, a damping capsule 582 is arranged inside the damping shell 581, a damping plate 583 is arranged on the upper side of the damping capsule 582, a damping rod 584 is fixedly installed on the upper side of the damping plate 583, the upper end of the damping rod 584 extends to the outside of the damping shell 581, and a damping spring 585 is sleeved on the outer periphery of the damping rod 584; wherein, one end of the through-tube frame 57 extends to the inside of the damping shell 581 and is fixedly connected with the damping capsule 582; the damping force of the damping fluid inside the damping capsule 582 can deeply unload and dissipate the residual impact force of the moving contact blade 23, and finally realize the stable connection between the moving contact blade 23 and the conductive contact 11 and the grounding contact 12.

[0067] See also Figure 6 , Fig.11 A shock absorbing plate 542 for limiting clamping is provided on the limiting block 54, and one side of the shock absorbing plate 542 is fixedly connected to the damping rod 584, wherein inclined surfaces 541 are provided on the left and right sides of the limiting block 54; when the stabilizing slider 43 contacts the limiting block 54, it will first contact its inclined surface 541, thereby pressing the limiting block 54 downward, so that the two relative limiting blocks 54 are separated from each other, and the setting of the inclined surface 541 is conducive to limiting clamping of the stabilizing slider 43.

[0068] The specific usage and function of this embodiment are as follows:

[0069] Working principle: When the switch needs to be opened and closed, the electric retractor 32 is started through program control, and the piston rod of the electric retractor 32 pushes the movable arm 33 to move, and the movable arm 33 drives the stabilizing rod 42 to move synchronously, and the moving contact knife 23 is driven by the stabilizing rod 42 to perform the opening and closing operation, thereby ensuring that the operation instruction can be accurately transmitted to the moving contact knife 23, so that the moving contact knife 23 can move according to the predetermined trajectory and position, thereby realizing the precise control of the circuit, and the moving contact knife 23 is in the process of moving, and the stabilizing rod is used to move the moving contact knife 23. 42 drives the stabilizing slider 43 to slide synchronously in the stabilizing slide groove 44, so that the movable contact blade 23 can resist the interference of external vibration and impact during the movement process, and maintain the high consistency of its movement trajectory, thereby effectively enhancing the anti-vibration and anti-deviating capabilities of the movable contact blade 23 during the movement process, ensuring the accuracy and stability of the trajectory of the movable contact blade 23. This stability not only reduces the wear between the movable contact blade 23 and the conductive contact 11 and the grounding contact 12, but also avoids arc discharge or overheating that may be caused by poor contact, thereby significantly improving the reliability and operation efficiency of the switch;

[0070] In addition, during the transmission process of the movable contact knife 23, the stabilizing rod 42 is used to drive the stabilizing slider 43 to slide in the stabilizing slide groove 44. When the movable contact knife 23 moves to a certain target position in the closing area, the opening area, and the contact area, at this time, under the action of the stabilizing rod 42, the stabilizing slider 43 is driven to contact the limit block 54, and when the stabilizing slider 43 contacts the limit block 54, it will first contact its inclined surface 541, thereby pressing the limit block 54 downward, so that the two relative limit blocks 54 are separated from each other, and during the movement of the limit block 54, the first support rod 533 retracts, and the second support rod 537 is used to push the limit slider 536 to slide on the limit slide rod 535, and at the same time, the support spring 53 8 is squeezed; as the movable contact knife 23 continues to move, the movable contact knife 23 drives the stabilizing slider 43 to move to the position between the limit blocks 54. At the same time, based on the elastic force of the support spring 538, the limit slider 536 is pushed to reset, and the first support rod 533 is used to push the limit block 54 to limit and clamp the movable contact knife 23. Through this setting, the movable contact knife 23 can be quickly and accurately locked to prevent it from continuing to move or deviating, and the contact knife can immediately and accurately stop moving when it reaches the closing, opening or grounding position, avoiding poor contact or mechanical damage caused by overshoot or undershoot, and the precise stop position also helps to extend the service life of the equipment and reduce the replacement frequency and cost;

[0071] When the limit slider 536 slides on the limit slider 535, the limit slider 536 drives the buffer block 555 to move synchronously, and uses the buffer rod 554 to drive the movable plate 553 to squeeze the buffer capsule 552. By providing a damping liquid inside the buffer capsule 552, the viscous resistance of the damping liquid medium is used to effectively attenuate the kinetic energy of the moving machine, absorb and disperse the impact force of the moving contact knife 23 during transmission, thereby reducing the impact force directly acting on the moving contact knife 23, achieving the purpose of preliminary unloading of the impact force, and protecting the moving contact knife 23 from damage. In addition, when the movable plate 553 squeezes the buffer capsule 552, the damping liquid inside the buffer capsule 552 flows through the connecting pipe 556, the connecting hose 56, The liquid flows through the pipe rack 57 and finally into the damping bag 582 inside the damping shell 581, thereby realizing the filling of the damping liquid. When the movable contact blade 23 drives the stabilizing slider 43 to move to the position between the limit block 54, the limit block 54 limits the position of the stabilizing slider 43, and at the same time, the shock absorbing plate 542 and the stabilizing slider 43 are in contact with each other. The damping force of the damping liquid inside the damping bag 582 can deeply unload and dissipate the remaining impact force of the movable contact blade 23, and finally realize the stable connection between the movable contact blade 23 and the conductive contact 11 and the grounding contact 12. Moreover, through the dual effects of the buffer component 55 and the damping component 58, the impact force generated during the transmission process of the movable contact blade 23 is greatly alleviated, further protecting the movable contact blade 23 from damage and extending the service life of the equipment.

[0072] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A three-position load switch, comprising a switch body (10), a conductive contact (11) and a grounding contact (12) arranged on the switch body (10), and a contact blade assembly (20) arranged on the switch body (10), Features: It also includes a stabilizing component (40) disposed on the switch body (10) for stabilizing the movement of the knife contact component (20), and a limiting mechanism (50) disposed inside the stabilizing component (40); The contact blade assembly (20) comprises a movable contact blade (23), wherein the movable contact blade (23) contacts the conductive contact (11) to realize the conduction of the closing circuit, the movable contact blade (23) separates from the conductive contact (11) to realize the disconnection of the opening circuit, and the movable contact blade (23) contacts the grounding contact (12) to realize the grounding position and perform circuit grounding protection; The stabilizing component (40) comprises a stabilizing shell (41) arranged on the left and right sides of the switch body (10); the limiting mechanism (50) comprises a limiting seat (51) fixedly mounted on the inner wall of the stabilizing shell (41); a fixed base block (52) is fixedly mounted on the limiting seat (51); limiting components (53) are arranged on both sides of the fixed base block (52); a limiting block (54) for limiting the movement of the moving contact knife (23) is fixedly mounted on the limiting component (53); a buffer component (55) for limiting the movement of the moving contact knife (23) is arranged on the fixed base block (52); the limiting A pipe support (57) is fixedly mounted in the positioning block (54), and a damping assembly (58) for force unloading and buffering is arranged on the pipe support (57). The bottom of the pipe support (57) is connected to the buffer assembly (55) through a connecting hose (56). When the transmission position of the movable contact knife (23) is limited by the positioning block (54), the buffer assembly (55) is used to perform preliminary force unloading and buffering on the force of the movable contact knife (23) during transmission, and the damping fluid in the buffer assembly (55) is driven to be injected into the damping assembly (58) to further unload and buffer the force of the movable contact knife (23) during transmission. The limiting assembly (53) comprises a limiting base plate (531) fixedly mounted on the limiting seat (51), a support block (532) being fixedly mounted on one side of the limiting base plate (531), and a limiting sliding rod (535) being fixedly mounted between the support block (532) and the buffer assembly (55); The limiting sliding rod (535) is provided with an active chamber (5351) inside, and a movable groove (5352) is provided on the top wall of the active chamber (5351); The buffer assembly (55) comprises a buffer shell (551) fixedly mounted on a fixed base block (52); a buffer capsule (552) is arranged inside the buffer shell (551); and a damping fluid is arranged inside the buffer capsule (552); a movable plate (553) is arranged on one side of the buffer capsule (552); a buffer rod (554) is fixedly mounted on a side of the movable plate (553) away from the buffer capsule (552); an end of the buffer rod (554) away from the movable plate (553) extends into a movable chamber (5351) of the limiting slide bar (535) and is fixedly connected to the buffer block (555); and a top of the buffer block (555) passes through a movable groove (5352) and is fixedly connected to the limiting slide bar (536); The buffer assembly (55) further comprises a connecting tube (556) fixedly mounted on the fixed base block (52), one end of the connecting tube (556) extending into the interior of the buffer shell (551) and fixedly connected to the buffer capsule (552), and one end of the connecting tube (556) away from the buffer capsule (552) is fixedly connected to the connecting hose (56); The damping assembly (58) comprises a damping shell (581) fixedly mounted on the limiting block (54); a damping capsule (582) is arranged inside the damping shell (581); a damping plate (583) is arranged on the upper side of the damping capsule (582); a damping rod (584) is fixedly mounted on the upper side of the damping plate (583); the upper end of the damping rod (584) extends to the outside of the damping shell (581); and a damping spring (585) is sleeved on the outer periphery of the damping rod (584); One end of the through-tube frame (57) extends into the interior of the damping shell (581) and is fixedly connected to the damping bag (582).

2. A three-position load switch according to claim 1, Features: The knife contact assembly (20) further comprises a knife contact seat (21) fixedly mounted on the switch body (10), a connecting pin (22) fixedly mounted on the knife contact seat (21), and the knife contact seat (21) is movably connected to the movable knife contact (23) via the connecting pin (22).

3. A three-position load switch according to claim 1, Features: The switch body (10) is provided with a transmission assembly (30) for driving the movable contact knife (23), the transmission assembly (30) comprising a fixed frame (31) fixedly mounted on the switch body (10), the fixed frame (31) being provided with an electric retractor (32) and a movable arm (33), the electric retractor (32) being movably mounted on the fixed frame (31) via a first movable pin shaft (321), and the movable arm (33) being movably mounted on the fixed frame (31) via a second movable pin shaft (331); The piston rod of the electric telescopic device (32) is fixedly connected to the movable arm (33), and one end of the movable arm (33) away from the second movable pin (331) is fixedly connected to the stabilizing rod (42).

4. A three-position load switch according to claim 1, Features: The stabilizing shell (41) is fixedly assembled with the switch body (10) through a fixing bracket (411), a stabilizing rod (42) is arranged between the stabilizing shell (41), the left and right ends of the stabilizing rod (42) pass through the movable contact knife (23) and extend to the interior of the stabilizing shell (41), a stabilizing groove (44) is provided inside the stabilizing shell (41), and a stabilizing slider (43) is provided inside the stabilizing groove (44), and one side of the stabilizing slider (43) is fixedly connected to the stabilizing rod (42).

5. A three-position load switch according to claim 4, Features: The outer periphery of the stabilizing rod (42) is provided with an insulating sleeve (421), and the stabilizing rod (42) is fixedly assembled with the movable contact knife (23) via the insulating sleeve (421).

6. A three-position load switch according to claim 1, Features: A first support rod (533) is rotatably mounted on the support block (532); a support seat (534) is rotatably mounted on one end of the first support rod (533) away from the support block (532); and an upper surface of the support seat (534) is fixedly connected to the limit clamping block (54); A limiting slider (536) is slidably mounted on the limiting slide bar (535); a second support rod (537) is movably connected between the limiting slide bar (536) and the first support rod (533); a support spring (538) is sleeved on the outer periphery of the limiting slide bar (535), and the support spring (538) is located between the limiting slide bar (536) and the buffer assembly (55).

7. A three-position load switch according to claim 1, Features: The limit clamping block (54) is provided with a damping plate (542) for limit clamping, one side of the damping plate (542) is fixedly connected to the damping rod (584), wherein the limit clamping block (54) has inclined surfaces (541) on the left and right sides.

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