A labor-saving operating mechanism for a large-current disconnector in a fixed low-voltage switchgear

Abstract

The present invention relates to the technical field of power equipment, in particular to a labor-saving operating mechanism for fixing a large-current disconnector in a low-voltage cabinet. A scraping groove is formed at the top of a scraping box, and the bottom of the scraping groove presents a concave arc shape. A moving contact plate is inserted into the scraping groove. The moving contact plate is drivingly connected to a driving module. A first through groove is formed in the inner wall at one end of one side of the scraping groove, and a resisting block is inserted into the first through groove. A second through groove is formed in the inner wall of the scraping groove on the side adjacent to the resisting block, and a contact is inserted into the second through groove. The contact is drivingly connected to the resisting block through a transmission module; the driving module is used to drive the moving contact plate to reciprocate along the bottom of the scraping groove in the scraping groove. During this process, at least a first working state and a second working state are included among the moving contact plate, the resisting block, and the contact. The present invention can more labor-savingly realize the operation of the disconnector, and at the same time can remove the oxide film and dirt on the surface of the moving contact plate by friction, so that the disconnector is not easily overheated due to poor contact.

Description

Technical Field

[0001] The invention relates to the technical field of electric power equipment, and in particular to a labor-saving operating mechanism for a large-current isolating switch in a fixed low-voltage cabinet. Background Art

[0002] In a fixed low-voltage cabinet, a high-current isolating switch needs to be installed to completely isolate the maintenance part from the live body during the circuit maintenance process. In the use of the existing isolating switch, in order to realize the on-off control of the isolating switch, and at the same time subject to the space limitation in the cabinet, the operating mechanism of the entire isolating switch needs to be operated through the transmission coordination of the transmission mechanism such as the gear rack, bevel gear, connecting rod, etc., which leads to the complexity of the transmission mechanism of the operating mechanism and the large transmission loss, and it takes more effort to realize the operation of the isolating switch. At the same time, during the operation of the existing isolating switch, due to the large number of connection points and transmission parts of the conductive part, the large stroke of the moving contact, and the contact is exposed to the air for a long time, it is easy to oxidize and get dirty, resulting in common and prominent overheating failures. Summary of the invention

[0003] The purpose of the present invention is to solve the shortcomings of the prior art, such as laborious operation, many connection points and transmission parts of the conductive parts, large travel of the moving contact, and the contacts being easily oxidized and contaminated due to long-term exposure to the air, leading to overheating failures, and to propose a labor-saving operating mechanism for a fixed low-voltage cabinet high-current isolating switch.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A labor-saving operating mechanism for a fixed low-voltage cabinet high-current isolating switch is designed, comprising a scraper box, a scraper groove is provided on the top of the scraper box, the bottom of the scraper groove is in a concave arc shape, a moving touch plate is inserted in the scraper groove, the moving touch plate is transmission-connected to a driving module, a first through groove is provided on the inner wall at one end of the scraper groove, a stop block is inserted in the first through groove, a second through groove is provided on the inner wall of the scraper groove on one side adjacent to the stop block, a contact is inserted in the second through groove, and the contact is transmission-connected to the stop block through a transmission module;

[0006] The driving module is used to drive the movable touch plate to reciprocate along the bottom of the scraping groove in the scraping groove. During this process, the movable touch plate, the stop block and the contact head at least include a first working state and a second working state;

[0007] When in the first working state: the movable touch plate is not in contact with the stop block, the stop block extends out of the first through groove and enters the scraping groove, and the stop block is placed in the second through groove;

[0008] When in the second working state: the movable touch plate contacts the resisting block, and the resisting block is pushed into the first through groove, and the resisting block synchronously drives the contact to extend out of the second through groove through the transmission module and then enter the scraping groove to contact the surface of the movable touch plate.

[0009] Preferably, the driving module includes a back plate, a fixed disk, a sleeve rod, a guide groove, a pressure rod, a pressure ring, and a first spring, one end of the sleeve rod is fixedly connected to the fixed disk, the fixed disk is fixedly connected to the moving touch plate, the other end of the sleeve rod is provided with a guide groove, a pressure rod is inserted in the guide groove, the pressure rod is rotatably mounted on a connecting seat, a rocker rod is fixedly connected to the connecting seat, a rotating shaft is rotatably mounted on the rocker rod, the rotating shaft is arranged parallel to the pressure rod, the rotating shaft is fixedly connected to the front side surface of the back plate, a baffle rod is respectively arranged on both sides of the rocker rod, and a driving mechanism is fixedly mounted on the rear side surface of the back plate, the driving mechanism is used to drive the rocker rod to perform reciprocating rotational motion around the rotating shaft between the two baffle rods.

[0010] Preferably, the driving mechanism includes a driving shaft, a swing arm, and a lever. The driving shaft is rotatably mounted on the rear side of the back plate, and the driving shaft is arranged parallel to the rotating axis. Two swing arms are arranged around the surface of the driving shaft, and the two swing arms are respectively placed on both sides of the swing lever. The end of each swing arm away from the driving shaft extends outside the back plate, and a lever is fixed on the surface of the swing arm facing the back plate, and the levers are arranged parallel to the rotating axis.

[0011] Preferably, the transmission module includes a first telescopic mechanism, a first telescopic rod, a transmission mechanism, a protective tube, a second telescopic mechanism, and a second telescopic rod. One end of the first telescopic rod is fixedly connected to the stop block via the first telescopic mechanism, one end of the second telescopic rod is fixedly connected to the contact via the second telescopic mechanism, a protective tube is coaxially provided on the second telescopic rod outside the scraper box, the stop block and the second telescopic mechanism are both placed in the protective tube, the protective tube is fixedly connected to the scraper box, and the first telescopic rod and the second telescopic rod are connected via a transmission mechanism.

[0012] Preferably, a sealing door mechanism is provided in the protective tube, and the sealing door mechanism includes a sealing plate, an entrance and exit, a door panel, and a connecting shaft. A sealing plate is fixedly installed in the protective tube, and an entrance and exit corresponding to the contact is opened on the sealing plate. A door panel is provided on the side of the sealing plate facing the first through groove, and the side of the door panel close to the top of the scraping groove is rotatably connected to the sealing plate through a connecting shaft.

[0013] Preferably, a sealing rubber pad is pasted and covered on the surface of the door panel close to the blocking plate, a first magnetic component is embedded and installed on the door panel, and a second magnetic component is embedded and installed on the blocking plate, and the first magnetic component and the second magnetic component attract each other.

[0014] Preferably, a discharge hole penetrating through the scraper box is provided at the bottom of the scraper groove, and a plurality of vertical grooves are provided on the inner wall of the scraper groove.

[0015] Preferably, the inner walls of the scraper grooves are sprayed with a wear-resistant coating.

[0016] Preferably, the moving contact plate and the contact are both made of copper.

[0017] Preferably, a silicone pad is fixed on the surface of the stop block on a side facing the movable touch plate.

[0018] The present invention proposes a labor-saving operating mechanism for a fixed low-voltage cabinet high-current isolating switch, and the beneficial effect is that: compared with the existing method of operating the isolating switch through transmission through gear racks, bevel gears, and worm gears, the technical solution of the present invention has smaller transmission loss, more streamlined structure, and more labor-saving operation. When operating this mechanism, when the moving touch plate moves along the scraping groove, the inner wall of the scraping groove can scrape off the oxide film on the surface of the moving touch plate, so that the contact can maintain a high conductivity when in contact with the moving touch plate. At the same time, the contact is connected to the abutment block through transmission, so that it can be retracted into the protective tube when not in contact with the moving touch plate, and the protective tube is used to protect it, so that its surface is not easily oxidized or adhered to dirt, thereby greatly reducing the occurrence of poor contact between the moving touch plate and the contact due to surface oxidation or dirt. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of a labor-saving operating mechanism for a fixed low-voltage cabinet high-current isolating switch proposed by the present invention Figure 1 ;

[0020] Figure 2 A schematic diagram of the structure of a labor-saving operating mechanism for a fixed low-voltage cabinet high-current isolating switch proposed by the present invention Figure 2 ;

[0021] Figure 3 A schematic diagram of the structure of a labor-saving operating mechanism for a fixed low-voltage cabinet high-current isolating switch proposed by the present invention Figure 3 ;

[0022] Figure 4 This is a schematic diagram of the transmission module structure of a labor-saving operating mechanism for a fixed low-voltage cabinet high-current isolating switch proposed by the present invention;

[0023] Figure 5 A structural schematic diagram of a labor-saving operating mechanism of a fixed low-voltage cabinet high-current isolating switch proposed by the present invention when a moving touch plate is in contact with a contact;

[0024] Figure 6 A structural schematic diagram of a labor-saving operating mechanism of a fixed low-voltage cabinet high-current isolating switch proposed by the present invention when the moving touch plate is not in contact with the contact;

[0025] Figure 7 Schematic diagram of the internal structure of the protection cylinder of a labor-saving operating mechanism for a large-current disconnecting switch in a fixed low-voltage cabinet proposed by the present invention;

[0026] Figure 8 Schematic diagram of the contact state structure inside the protection cylinder of a labor-saving operating mechanism for a large-current disconnecting switch in a fixed low-voltage cabinet proposed by the present invention Figure 1 ;

[0027] Figure 9 Schematic diagram of the contact state structure inside the protection cylinder of a labor-saving operating mechanism for a large-current disconnecting switch in a fixed low-voltage cabinet proposed by the present invention Figure 2 ;

[0028] Figure 10 Schematic diagram of the distribution of the discharge holes and vertical grooves of a labor-saving operating mechanism for a large-current disconnecting switch in a fixed low-voltage cabinet proposed by the present invention.

[0029] In the figure: 1, back plate; 2, scraping box; 3, scraping groove; 4, moving contact plate; 5, fixed disk; 6, sleeve rod; 7, guiding groove; 8, pressing rod; 9, pressing ring; 10, first spring; 11, connecting seat; 12, swing rod; 13, rotating shaft; 14, blocking rod; 15, lever; 16, swing arm; 17, driving shaft; 18, first through groove; 19, abutting block; 20, first telescopic rod; 21, first blocking member; 22, second spring; 23, connecting rod; 24, second through groove; 25, protection cylinder; 26, second telescopic rod; 27, contact; 28, third spring; 29, plugging plate; 30, door panel; 31, contact disk; 32, cam; 33, vertical shaft; 34, crank; 35, vertical groove; 36, discharge hole. Specific embodiments

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0031] Embodiment 1

[0032] Refer to Figure 1-10A labor-saving operating mechanism for a fixed low-voltage cabinet high-current isolating switch comprises a scraper box 2, a scraper groove 3 is provided on the top of the scraper box 2, a discharge hole 36 is provided at the bottom of the scraper groove 3, and a plurality of vertical grooves 35 are provided on the inner wall of the scraper groove 3. By providing the vertical grooves 35, when the movable touch plate 4 moves in the scraper groove 3, the oxide film and dirt on the surface of the movable touch plate 4 are scraped off, and can enter the vertical grooves 35 and fall into the bottom of the scraper groove 3, and finally be discharged through the discharge holes 36 at the bottom of the scraper groove 3, thereby preventing the oxide film and dirt from continuing to adhere to the surface of the movable touch plate 4. The inner wall of the scraper groove 3 is sprayed with a wear-resistant coating. The bottom of the scraper groove 3 is in a concave arc shape, and a moving touch plate 4 is inserted in the scraper groove 3, and the moving touch plate 4 is connected to the driving module in transmission. A first through groove 18 is provided on the inner wall at the end of one side of the scraper groove 3, and a stopper 19 is inserted in the first through groove 18. A second through groove 24 is provided on the inner wall of the scraper groove 3 adjacent to the stopper 19, and a contact 27 is inserted in the second through groove 24. The contact 27 is connected to the stopper 19 in transmission through the transmission module; the moving touch plate 4 and the contact 27 are both made of copper. A silicone pad is fixed on the surface of the stopper 19 facing the moving touch plate 4. The silicone pad can reduce the damage between the moving touch plate 4 and the stopper 19 when the moving touch plate 4 collides with it.

[0033] The driving module is used to drive the movable touch plate 4 to reciprocate along the bottom of the scraping groove 3 in the scraping groove 3. During this process, the movable touch plate 4, the stopper 19 and the contact 27 at least include a first working state and a second working state.

[0034] When in the first working state: the movable touch plate 4 is not in contact with the stopper 19, the stopper 19 extends out of the first through groove 18 and enters the scraping groove 3, and the stopper 19 is placed in the second through groove 24;

[0035] When in the second working state: the movable touch plate 4 contacts the stopper 19 and pushes the stopper 19 into the first through groove 18 , and the stopper 19 synchronously drives the contact 27 through the transmission module to extend out of the second through groove 24 and enter the scraping groove 3 to contact the surface of the movable touch plate 4 .

[0036] The driving module includes a back plate 1, a fixed plate 5, a sleeve rod 6, a guide groove 7, a pressure rod 8, a pressure ring 9, and a first spring 10. One end of the sleeve rod 6 is fixedly connected to the fixed plate 5, and the fixed plate 5 is fixedly connected to the moving touch plate 4. The other end of the sleeve rod 6 is provided with a guide groove 7, and a pressure rod 8 is inserted in the guide groove 7. The pressure rod 8 is rotatably mounted on a connecting seat 11, and a swing rod 12 is fixedly connected to the connecting seat 11. A rotating shaft 13 is rotatably mounted on the swing rod 12, and the rotating shaft 13 is arranged parallel to the pressure rod 8. The rotating shaft 13 is fixedly connected to the front side of the back plate 1, and a baffle 14 is respectively arranged on both sides of the swing rod 12. A driving mechanism is fixedly installed on the rear side of the back plate 1, and the driving mechanism is used to drive the swing rod 12 to perform reciprocating rotational motion around the rotating shaft 13 between the two baffle rods.

[0037] The driving mechanism includes a driving shaft 17, a swing arm 16, and a lever 15. The driving shaft 17 is rotatably installed on the rear side of the back plate 1. The driving shaft 17 is arranged parallel to the rotating shaft 13. Two swing arms 16 are arranged around the surface of the driving shaft 17, and the two swing arms 16 are respectively placed on both sides of the swing rod 12. The end of each swing arm 16 away from the driving shaft 17 extends outside the back plate 1. A lever 15 is fixed on the surface of the swing arm 16 facing the back plate 1, and the lever 15 is arranged parallel to the rotating shaft 13.

[0038] When the driving module is in use, the operator does not need to move the movable touch plate 4 in the scraper groove 3 with great effort. The operator only needs to rotate the driving shaft 17, and then drive the swing arm 16 to cooperate with the lever 15 to drive the swing rod 12 to swing, and then push the movable touch plate 4 to move in the scraper groove 3 through the first spring 10 on the sleeve rod 6. Compared with the existing method of operating the isolating switch through gear racks, bevel gears, and worm gears, the transmission loss is smaller, the structure is more streamlined, and the operation is more labor-saving.

[0039] The transmission module includes a first telescopic mechanism, a first telescopic rod 20, a transmission mechanism, a protective tube 25, a second telescopic mechanism, and a second telescopic rod 26. One end of the first telescopic rod 20 is fixedly connected to the stop block 19 through the first telescopic mechanism, and one end of the second telescopic rod 26 is fixedly connected to the contact 27 through the second telescopic mechanism. A protective tube 25 is coaxially sleeved on the second telescopic rod 26 outside the scraper box 2. The stop block 19 and the second telescopic mechanism are both placed in the protective tube 25. The protective tube 25 is fixedly connected to the scraper box 2. The first telescopic rod 20 and the second telescopic rod 26 are connected through a transmission mechanism. The first telescopic mechanism includes a second spring 22 and a first blocking member 21. The first blocking member 21 is sleeved on the first telescopic rod 20. A spring is sleeved on the first telescopic rod 20 between the first blocking ring and the stop block 19. The first blocking member 21 is fixed to the scraper box 2. The second telescopic mechanism includes a third spring 28. A third spring 28 is sleeved on the second telescopic rod 26 between the end of the protective tube 25 away from one end of the contact 27 and the contact 27. The two ends of the third spring 28 are respectively fixedly connected to the protective tube 25 and the contact 27. The transmission mechanism includes a first fixed shaft, a connecting rod 23, a second fixed shaft, A crank 34, a vertical shaft 33, a cam 32, and a contact plate 31. A first fixed shaft is rotatably mounted on one end of the connecting rod 23, and the first fixed shaft is fixedly connected to the first telescopic rod 20. A second fixed shaft is rotatably mounted on the other end of the connecting rod 23. A cam 32 is coaxially fixedly mounted on the vertical shaft 33. A contact plate 31 in contact with the cam 32 is fixedly mounted on the second telescopic rod 26. The crank 34 is fixed on the vertical shaft 33, and the second fixed shaft is rotatably connected to the crank 34. The first fixed shaft, the second fixed shaft, and the vertical shaft 33 are arranged parallel to each other, and the vertical shaft 33 is rotatably connected to the scraper box 2.

[0040] In this embodiment, the driving shaft 17 of the labor-saving operating mechanism is connected to the operating knob on the low-voltage cabinet, and the moving touch plate 4 and the contact 27 are part of the isolating switch. The moving touch plate 4 and the contact 27 are electrically connected to the input line and the output line of the isolating switch respectively, so that when the moving touch plate 4 and the contact 27 are in contact, the input line can be connected to the output line, so that the conductive part of the isolating switch can conduct the current in the line. When operating this mechanism, when the moving touch plate 4 moves along the scraping groove 3, the inner wall of the scraping groove 3 can scrape off the oxide film on the surface of the moving touch plate 4, so that the contact 27 can maintain a high conductivity when in contact with the moving touch plate 4. At the same time, the contact 27 is connected to the stopper 19 through transmission, so that it can be collected into the protective tube 25 when it is not in contact with the moving touch plate 4, and the protective tube 25 is used to protect it, so that its surface is not easy to be oxidized or attached with dirt, thereby greatly reducing the occurrence of poor contact between the moving touch plate 4 and the contact 27 due to surface oxidation or dirt.

[0041] Example 2

[0042] Reference Figure 1-10 As another preferred embodiment of the present invention, the difference from the embodiment 1 is that a sealing door mechanism is arranged in the protection tube 25, and the sealing door mechanism includes a blocking plate 29, an inlet and outlet, a door plate 30, and a connecting shaft. The blocking plate 29 is fixedly installed in the protection tube 25, and an inlet and outlet corresponding to the contact 27 is opened on the blocking plate 29. The blocking plate 29 is provided with a door plate 30 on the side facing the first through groove 18, and the side of the door plate 30 close to the top of the scraping groove 3 is rotatably connected to the blocking plate 29 through a connecting shaft. The door plate 30 has at least two working states; when the door plate 30 is in the first working state, the door plate 30 covers the inlet and outlet, and the contact 27 is retracted into the protection tube 25 inside the blocking plate 29; when the door plate 30 is in the second working state, the door plate 30 swings upward around the connecting shaft so that the contact 27 can pass through the inlet and outlet on the blocking plate 29.

[0043] The surface of the door panel 30 close to the blocking plate 29 is covered with a sealing pad, a first magnetic component is embedded and installed on the door panel 30, and a second magnetic component is embedded and installed on the blocking plate 29, and the first magnetic component and the second magnetic component attract each other. In order to ensure that the door panel 30 can better seal the entrance and exit, the magnetic component is set to allow it to better fit with the surface of the blocking plate 29, and the sealing pad can further improve the sealing performance. The gap between the second telescopic rod 26 and the protective tube 25 is also sealed.

[0044] By setting the sealing door mechanism, the sealing door mechanism is as follows in the initial state. Figure 9As shown, at this time, the contact 27 is placed between the sealing plate 29 and the end of the protection cylinder 25, and the door plate 30 is in the closed state, closing the entrance and exit. At this time, the contact 27 is placed in an environment relatively isolated from the outside world, thus greatly reducing the occurrence of the formation of oxide films or the attachment of dirt. When the second telescopic rod 26 pushes the contact 27 to contact the moving contact plate 4, after the contact 27 enters the entrance and exit on the sealing plate 29 and continues to move forward, it will push the door plate 30 upward, so that the door plate 30 automatically opens. The final state is as shown in the appendix Figure 8 shown

[0045] The overall working process of the present invention is as follows:

[0046] In the initial state, the state of the entire labor-saving operating mechanism is as shown in the appendix Figure 6 、 9 shown. At this time, the entire disconnector is in the off state, and the moving contact plate 4 does not contact the contact 27. When it is necessary to connect the disconnector, the operator rotates the drive shaft 17, and the drive shaft 17 drives the two swing arms 16 to rotate. The lever 15 on the swing arm 16 located on the left side of the swing rod 12 will contact the swing rod 12 and push the swing rod 12 to rotate clockwise around the rotation shaft 13, so that the swing rod 12 does not separate from the stop rod 14 on its left side, and then contacts the stop rod 14 on the right side;

[0047] In the above process, the swing rod 12 first drives the pressure rod 8 to press the pressure ring 9 downward along the guide groove 7 through the connecting seat 11, so that the pressure ring 9 compresses the first spring 10. At the same time, the swing rod 12 also pushes the sleeve rod 6 to the left. When the sleeve rod 6 swings to the left by a certain amplitude, at this time, the first spring 10 pushes the fixed disk 5 and the moving contact plate 4 to slide along the bottom of the scraping groove 3 until the moving contact plate 4 slides to the other end of the scraping groove 3. At this time, the moving contact plate 4 will push the abutting block 19 to retract into the first through groove 18, and the abutting block 19 synchronously drives the first telescopic rod 20 through the telescopic rod. The first telescopic rod 20 drives the vertical shaft 33 to rotate through the connecting rod 23 and the crank 34. The vertical shaft 33 drives the cam 32 to rotate. The cam 32 pushes the contact disk 31, the second telescopic rod 26, and the contact 27 toward the scraping groove 3 side, so that the contact 27 sequentially passes through the entrance and exit on the sealing plate 29 and the second through groove 24 and enters the scraping groove 3, and finally contacts the surface of the moving contact plate 4 in the scraping groove 3, so that the moving contact plate 4 is connected to the contact 27, and the disconnector is connected. The final state is as shown in the appendix Figure 5 、 8 shown

[0048] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention

Claims

1. A labor-saving operating mechanism for a large-current disconnector in a fixed low-voltage switchgear, including a scraping box (2), characterized in that, A scraping groove (3) is formed at the top of the scraping box (2). The bottom of the scraping groove (3) is in a concave arc shape. A moving contact plate (4) is inserted into the scraping groove (3). The moving contact plate (4) is drivingly connected to a driving module. A first through groove (18) is formed in the inner wall at one end of one side of the scraping groove (3). A pressing block (19) is inserted into the first through groove (18). A second through groove (24) is formed in the inner wall of the scraping groove (3) on the side adjacent to the pressing block (19). A contact head (27) is inserted into the second through groove (24). The contact head (27) is drivingly connected to the pressing block (19) through a transmission module. The driving module is used to drive the moving contact plate (4) to reciprocate along the bottom of the scraping groove (3) in the scraping groove (3). During this process, at least a first working state and a second working state are included among the moving contact plate (4), the pressing block (19), and the contact head (27). When in the first working state: the moving contact plate (4) is not in contact with the pressing block (19). The pressing block (19) extends out of the first through groove (18) and enters the scraping groove (3). The pressing block (19) is placed in the second through groove (24). When in the second working state: the moving contact plate (4) is in contact with the pressing block (19), and the pressing block (19) is pushed into the first through groove (18). The pressing block (19) synchronously drives the contact head (27) through the transmission module to extend out of the second through groove (24) and then enter the scraping groove (3) to be in contact with the surface of the moving contact plate (4). The driving module includes a back plate (1), a fixing disk (5), a sleeve rod (6), a guiding groove (7), a pressing rod (8), a pressing ring (9), and a first spring (10). One end of the sleeve rod (6) is fixedly connected to the fixing disk (5). The fixing disk (5) is fixedly connected to the moving contact plate (4). The other end of the sleeve rod (6) is provided with a guiding groove (7). A pressing rod (8) is inserted into the guiding groove (7). The pressing rod (8) is rotatably installed on a connecting seat (11). A swing rod (12) is fixedly connected to the connecting seat (11). A rotating shaft (13) is rotatably installed on the swing rod (12). The rotating shaft (13) is arranged parallel to the pressing rod (8). The rotating shaft (13) is fixedly connected to the front side of the back plate (1). A blocking rod (14) is arranged on each of the two sides of the swing rod (12). A driving mechanism is fixedly installed on the rear side of the back plate (1). The driving mechanism is used to drive the swing rod (12) to reciprocally rotate around the rotating shaft (13) between the two blocking rods (14).

2. The labor-saving operating mechanism for the large-current disconnector of the fixed low-voltage switchgear according to claim 1, wherein The driving mechanism comprises a driving shaft (17), a swing arm (16), and a lever (15); the driving shaft (17) is rotatably mounted on the rear side of the back plate (1); the driving shaft (17) is arranged parallel to the rotation axis (13); two swing arms (16) are arranged around the surface of the driving shaft (17); the two swing arms (16) are respectively arranged on both sides of the lever (12); the end of each swing arm (16) away from the driving shaft (17) extends outside the back plate (1); a lever (15) is fixed to the surface of the swing arm (16) facing the back plate (1); the levers (15) are arranged parallel to the rotation axis (13).

3. The labor-saving operating mechanism for the fixed low-voltage switchgear large-current disconnector according to claim 1, characterized in that The transmission module comprises a first telescopic mechanism, a first telescopic rod (20), a transmission mechanism, a protective tube (25), a second telescopic mechanism, and a second telescopic rod (26); one end of the first telescopic rod (20) is fixedly connected to a stopper (19) via the first telescopic mechanism; one end of the second telescopic rod (26) is fixedly connected to a contact (27) via the second telescopic mechanism; a protective tube (25) is coaxially sleeved on the second telescopic rod (26) outside the scraper box (2); the stopper (19) and the second telescopic mechanism are both placed in the protective tube (25); the protective tube (25) is fixedly connected to the scraper box (2); and the first telescopic rod (20) and the second telescopic rod (26) are transmission-connected via the transmission mechanism.

4. The labor-saving operating mechanism for the large-current isolating switch of the fixed low-voltage switchgear according to claim 3, wherein, A sealing door mechanism is arranged in the protective tube (25), and the sealing door mechanism comprises a blocking plate (29), an inlet and outlet, a door plate (30), and a connecting shaft. The blocking plate (29) is fixedly installed in the protective tube (25), and an inlet and outlet corresponding to the contact (27) is formed on the blocking plate (29). The blocking plate (29) is provided with a door plate (30) on a side facing the first through groove (18), and a side of the door plate (30) close to the top of the scraping groove (3) is rotatably connected to the blocking plate (29) via a connecting shaft.

5. The labor-saving operating mechanism for the large-current isolating switch of the fixed low-voltage switchgear according to claim 4, characterized in that, A sealing rubber pad is pasted and covered on the surface of one side of the door panel (30) close to the blocking plate (29); a first magnetic attraction component is embedded and installed on the door panel (30); a second magnetic attraction component is embedded and installed on the blocking plate (29); the first magnetic attraction component and the second magnetic attraction component attract each other.

6. The labor-saving operating mechanism for the fixed low-voltage switchgear large-current disconnector according to claim 1, characterized in that, A discharge hole (36) penetrating the scraper box (2) is provided at the bottom of the scraper groove (3), and a plurality of vertical grooves (35) are provided on the inner wall of the scraper groove (3).

7. The labor-saving operating mechanism for the large-current isolating switch of the fixed low-voltage switchgear according to claim 1, wherein, The inner walls of the scraping grooves (3) are sprayed with a wear-resistant coating.

8. The labor-saving operating mechanism for the large-current disconnector of the fixed low-voltage switchgear according to claim 1, wherein, The movable contact plate (4) and the contact (27) are both made of copper.

9. The labor-saving operating mechanism for the large-current disconnecting switch of the fixed low-voltage switchgear according to claim 1, characterized in that, A silicone pad is fixed on the surface of the stop block (19) on the side facing the movable touch plate (4).

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