Special knife handle-like moving contact structure system for large-current circuit breaker

Abstract

The invention relates to a special knife handle-like moving contact structure system for a high-current circuit breaker, which belongs to the technical field of power system equipment and comprises a fixed grid and a plurality of contact units, a central hole is formed in the middle of the fixed grid, and the contact units are arranged around the central hole and are uniformly mounted on the fixed grid along the circumferential direction. One end of the contact unit is clamped with the conductive contact arm, and the other end of the contact unit is clamped and attached to the static contact; the contact unit comprises a contact assembly and an arc-shaped elastic piece, the contact assembly comprises a contact block, a first clamping groove and a second clamping groove are formed in the side, away from the center hole, of the contact block, the first clamping groove and the second clamping groove are symmetrically arranged, and the arc-shaped elastic piece is arranged between the first clamping groove and the second clamping groove; the two ends of the arc-shaped elastic piece are arranged in the first clamping groove and the second clamping groove respectively. And a plurality of mounting grooves in one-to-one correspondence with the contact units are formed in the fixed grid. The device is good in stability, convenient to overhaul, high in adaptability, capable of being rapidly adjusted according to circuit breakers with different currents and reliable and convenient to use.

Description

Technical Field

[0001] The invention relates to a knife handle-like moving contact structure system special for a large current circuit breaker, belonging to the technical field of power system equipment. Background Art

[0002] A high-current circuit breaker is a device used to protect circuits in power systems. It can automatically cut off the circuit when the current exceeds the safe value to prevent damage caused by overload and short circuit. High-current circuit breakers are widely used in power systems and industrial facilities to ensure the safety of equipment and personnel. Their main features include overload protection, short circuit protection and undervoltage protection.

[0003] High-current circuit breakers are also one of the core components in high-voltage switchgear. They are responsible for executing the circuit connection and disconnection operations. High-current circuit breakers are usually composed of moving and static contacts, arc extinguishing devices, operating mechanisms and protective devices. The moving contact is a key component in the circuit breaker. It is used together with the static contact to connect or disconnect the circuit. The main feature of the moving contact is that it can move with the actuator, contact or separate with the static contact, thereby controlling the connection and disconnection of the circuit. The design and performance of the moving contact are crucial to the reliability and safety of the circuit breaker.

[0004] The existing circuit breaker moving contacts of high-voltage switch cabinets use plum blossom-shaped contacts with a complex structural system, including contact pieces, annular support frames, and tension springs. Several contact pieces are fixed on the annular support frame, and the first contact and the second contact are respectively provided at the two ends of the inner and outer ring walls. The tension spring is fixed on the outer ring wall and corresponds to the first contact and the second contact. On the outer ring wall of the annular body formed by the contact pieces, adjacent to the outside of the first contact, a first annular groove and a second annular groove are provided, and a tension spring is embedded in each of the two annular grooves. On the other side of the outer ring wall of the annular body formed by the contact pieces, adjacent to the outside of the second contact, a third annular groove and a fourth annular groove are provided, and a tension spring is embedded in each of the two annular grooves. The plum blossom contact adopts a double spring structure in the conductive connection to ensure the tightness of the conductive connection. However, during operation, the moving contact tension spring that is in a heated state for a long time will lose its spring function, resulting in insufficient contact pressure between the moving and static contacts, which leads to an increase in contact resistance, causing the contact spring to break and the contact pieces to spread, causing accidents. Low reliability, and the entire contact must be replaced when a fault occurs.

[0005] A vacuum circuit breaker mounted on the indoor high-voltage side disclosed in a Chinese invention patent with publication number CN108493038A comprises a housing, a plurality of circuit breaker contacts arranged on one side inside the housing, a metal spring connected to the bottom of the circuit breaker contact by screws, a motor is fixed on the other side of the housing, a battery and a switch are connected in series to the motor, a screw is connected to the output shaft of the motor through a coupling, a rolling cylinder is sleeved on the screw, the metal spring is 1-2 mm away from the rolling cylinder, and the circuit breaker contacts comprise a plum blossom contact, a static contact, and a moving contact.

[0006] The circuit breaker contacts in the above reference example are plum blossom contacts. During operation, the spring failure caused by long-term heating cannot be solved. The circuit breaker contacts have poor reliability and are easily damaged. Therefore, improvements are urgently needed. Summary of the invention

[0007] In order to overcome the above-mentioned shortcomings of the prior art, the present invention designs a knife-handle-like moving contact structure system specially used for large current circuit breakers, which has good stability, convenient maintenance, strong adaptability, can be quickly adjusted for circuit breakers of different currents, and is reliable and convenient to use.

[0008] In order to achieve the above object, the present invention adopts the following technical solution:

[0009] A knife handle-like moving contact structure system specially used for a large current circuit breaker comprises a fixed grid and a plurality of contact units, wherein a center hole is provided in the middle of the fixed grid, each of the contact units is arranged around the center hole, and each of the contact units is uniformly mounted on the fixed grid along the circumferential direction, one end of the contact unit is clamped with a conductive contact arm, and the other end is clamped tightly with a static contact; the contact unit comprises a contact assembly and an arc-shaped spring piece, and the contact assembly comprises a contact block, a first clamping groove and a second clamping groove are provided on a side of the contact block away from the center hole, the first clamping groove and the second clamping groove are symmetrically arranged with the median perpendicular line of a side edge of the contact block away from the center hole as the symmetry axis, an arc-shaped spring piece is provided between the first clamping groove and the second clamping groove, and two ends of the arc-shaped spring piece are respectively arranged inside the first clamping groove and the second clamping groove; a plurality of mounting grooves corresponding to each contact unit are provided on the fixed grid.

[0010] Furthermore, the two ends of the contact block close to the central hole are respectively integrally connected with a contact block and a clamping block; each of the clamping blocks is clamped with a conductive contact arm, and each of the contact blocks is clamped and fitted with a stationary contact.

[0011] Furthermore, a top-to-top inclined surface is provided on one side of the contact block close to the stationary contact, and the top-to-top inclined surface is inclined toward the clamping block.

[0012] Furthermore, a connecting slot is provided in the middle of the bottom end of the contact block, and the connecting slot is connected to a side of the mounting slot close to the stationary contact under the action of the arc-shaped spring sheet.

[0013] Furthermore, the fixed grid comprises a circular collar block, the center of the central hole coincides with the center of the collar block; a reinforcing ring is integrally and vertically fixedly connected to the outer edge of the collar block on one side close to the conductive contact arm.

[0014] Furthermore, one end of the conductive contact arm close to the stationary contact is coaxially fixedly connected with a stepped shaft, the stepped shaft comprises an outer shaft and an inner shaft connected integrally, the diameter of the outer shaft is larger than the diameter of the inner shaft, and the inner shaft is fixedly connected to the conductive contact arm.

[0015] Furthermore, a first arc-shaped groove which fits with the inner shaft surface of the stepped shaft is provided at the bottom end of the clamping block; and a second arc-shaped groove which fits with the surface of the static contact is provided at the bottom end of the contact block.

[0016] Furthermore, the highest point of the protrusion of the arc-shaped spring piece fits with a side of the mounting groove away from the static contact.

[0017] Furthermore, the width of the connecting slot is greater than the thickness of the collar block.

[0018] Furthermore, the thickness of the contact block is 8 cm, and the length of the contact block is 45 cm; the distance between the lowest point of the contact block and the side of the contact block away from the static contact is 10.3 cm, and the distance between the lowest point of the clamping block and the side of the contact block away from the static contact is 12.8 cm.

[0019] Compared with the prior art, the present invention has the following characteristics and beneficial effects:

[0020] 1. The present invention provides an installation groove for installing the contact assembly in the fixed grid, so that one or several contact assemblies can be replaced or removed at any time. When the contact assembly is damaged, it is not necessary to replace the entire contact assembly, thereby improving the applicability of the device. At the same time, through the arrangement of the arc-shaped spring piece and the contact block, the arc-shaped spring piece can always press the contact block, so that the two ends of the contact block can respectively clamp the static contact and the conductive contact arm, thereby ensuring the stability and tightness of the contact assembly during the connection process, achieving a good connection, strong adaptability, and high working reliability. When the static contact exits the connection, the arc-shaped spring piece can open the end of the contact block close to the conductive contact arm, thereby achieving disconnection, effectively improving the safety of the static contact when disconnected.

[0021] 2. The present invention facilitates clamping connection and improves stability during the connection process by setting the contact block and the clamping block; by setting the top inclined surface, the end radius of the static contact and the top inclined surface can be matched when the static contact enters the connection, so that the contact block is opened, and the static contact can be completely entered into the contact assembly and clamped by the contact assembly, effectively ensuring the stability of the connection; the connecting slot can be clamped with the installation slot, which can limit the contact block and prevent the contact block from detaching when the static contact is connected, thereby improving stability during the connection process.

[0022] 3. The present invention can limit the contact block when it swings through the provision of a reinforcement ring to prevent the contact block from excessive swinging, and at the same time can also improve the overall strength of the fixed grid and improve the stability of the device; the provision of the first arc groove and the second arc groove can make the contact block fit more closely to the static contact and the conductive contact arm, and the connection is more stable. At the same time, when the contact assembly clamps the arc spring piece, the highest point of the protrusion of the arc spring piece fits with the side of the mounting groove away from the static contact, so that the arc spring piece can press the contact block to the greatest extent, and then the contact block can press the static contact and the conductive contact arm, thereby making the connection more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the installation structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the cooperation between the contact assembly and the fixed grid of the present invention;

[0025] Figure 3 It is a schematic diagram of the main structure of the contact assembly of the present invention;

[0026] Figure 4 is a schematic diagram of the top view of the contact assembly of the present invention;

[0027] Figure 5 It is a left-side structural schematic diagram of the contact assembly of the present invention.

[0028] The figures are marked as follows: 100, moving contact body; 200, three-phase busbar; 300, circuit breaker body; 400, contact box; 1, static contact; 2, contact assembly; 201, contact block; 202, clamping block; 2021, first arc groove; 203, contact block; 2031, second arc groove; 204, top inclined surface; 205, first clamping groove; 206, second clamping groove; 207, connecting clamping groove; 3, fixed grid; 301, collar block; 302, mounting groove; 303, center hole; 304, reinforcement ring; 4, arc-shaped spring piece; 5, conductive contact arm; 501, stepped shaft. DETAILED DESCRIPTION

[0029] The present invention is described in more detail below with reference to the embodiments.

[0030] See also Figures 1 to 5 A knife handle-like moving contact structure system for a large current circuit breaker includes a fixed grid 3 and a plurality of contact units. A central hole 303 is provided in the middle of the fixed grid 3. Each contact unit is arranged around the central hole 303, and each contact unit is evenly installed on the fixed grid 3 along the circumferential direction. One end of the contact unit is clamped with a conductive contact arm 5, and the other end is clamped and fitted with a static contact 1.

[0031] The contact unit includes a contact assembly 2 and an arc-shaped spring piece 4. The contact assembly 2 includes a contact block 201. A first slot 205 and a second slot 206 are provided on a side of the contact block 201 away from the center hole 303. The first slot 205 and the second slot 206 are symmetrically arranged with the perpendicular midline of the side of the contact block 201 away from the center hole 303 as the symmetry axis. An arc-shaped spring piece 4 is arranged between the first slot 205 and the second slot 206. Two ends of the arc-shaped spring piece 4 are respectively arranged inside the first slot 205 and the second slot 206.

[0032] The fixed grid 3 is provided with a plurality of mounting slots 302 corresponding to the contact units one by one.

[0033] As can be seen from the above description, the beneficial effect of the present invention lies in that, by providing the mounting groove 302 for mounting the contact assembly 2 in the fixed grid 3, one or several of the contact assemblies 2 can be replaced or removed at any time. When the contact assembly 2 is damaged, it is not necessary to replace the entire contact assembly 2, thereby improving the applicability of the device. At the same time, by providing the arc-shaped spring piece 4 and the contact block 201, the arc-shaped spring piece 4 can always press the contact block 201, so that the two ends of the contact block 201 can respectively clamp the static contact 1 and the conductive contact arm 5, thereby ensuring the stability and tightness of the contact assembly 2 during the connection process, achieving a good connection, strong adaptability, and high working reliability. When the static contact 1 exits the connection, the arc-shaped spring piece 4 can open the end of the contact block 201 close to the conductive contact arm 5, thereby achieving disconnection, thereby effectively improving the safety of the static contact 1 when disconnected.

[0034] Furthermore, the two ends of the contact block 201 close to the central hole 303 are respectively integrally connected with a contact block 203 and a clamping block 202; each clamping block 202 is clamped with the conductive contact arm 5, and each contact block 203 is clamped and fitted with the static contact 1.

[0035] It can be seen from the above description that the arrangement of the contact block 203 and the clamping block 202 facilitates clamping connection and improves stability during the connection process.

[0036] Furthermore, a top-facing inclined surface 204 is provided on one side of the contact block 203 close to the stationary contact 1 , and the top-facing inclined surface 204 is inclined toward the clamping block 202 .

[0037] It can be seen from the above description that the setting of the top bevel 204 can make the end radius of the static contact 1 match with the top bevel 204 when the static contact 1 enters the connection, thereby opening the contact block 201 and allowing the static contact 1 to completely enter the interior of the contact assembly 2 and be clamped by the contact assembly 2, effectively ensuring the stability of the connection.

[0038] Furthermore, a connecting slot 207 is provided in the middle of the bottom end of the contact block 201 , and the connecting slot 207 is connected to a side of the mounting slot 302 close to the stationary contact 1 under the action of the arc-shaped spring piece 4 .

[0039] It can be seen from the above description that the connection slot 207 can be engaged with the installation slot 302, which can limit the contact block 201 and prevent the contact block 201 from being separated when the stationary contact 1 is connected, thereby improving the stability during the connection process.

[0040] Furthermore, the fixed grid 3 includes a circular collar block 301 , the center of the central hole 303 coincides with the center of the collar block 301 ; a reinforcing ring 304 is integrally and vertically fixedly connected to the outer edge of the collar block 301 on one side close to the conductive contact arm 5 .

[0041] From the above description, it can be seen that the setting of the reinforcement ring 304 can limit the contact block 201 when the contact block 201 swings to prevent the contact block 201 from swinging excessively, and at the same time can also improve the overall strength of the fixed grid 3 and improve the stability of the device.

[0042] Furthermore, one end of the conductive contact arm 5 close to the stationary contact 1 is coaxially fixedly connected with a stepped shaft 501 , the stepped shaft 501 includes an outer shaft and an inner shaft connected as one piece, the diameter of the outer shaft is larger than the diameter of the inner shaft, and the inner shaft is fixedly connected to the conductive contact arm 5 .

[0043] It can be seen from the above description that the stepped shaft 501 can be well engaged with the engaging block 202 , and the connection stability is good.

[0044] Furthermore, a first arc-shaped groove 2021 is provided at the bottom end of the clamping block 202 to fit with the inner shaft surface of the stepped shaft 501 ; and a second arc-shaped groove 2031 is provided at the bottom end of the contact block 203 to fit with the surface of the static contact 1 .

[0045] It can be seen from the above description that the provision of the first arc-shaped groove 2021 and the second arc-shaped groove 2031 can make the contact block 201 fit the stationary contact 1 and the conductive contact arm 5 more closely, and the connection is more stable.

[0046] Furthermore, the highest point of the protrusion of the arc-shaped spring piece 4 is in contact with a side of the mounting groove 302 away from the static contact 1 .

[0047] From the above description, it can be seen that when the contact assembly 2 clamps the arc-shaped spring piece 4, the highest point of the protrusion of the arc-shaped spring piece 4 fits with the side of the mounting groove 302 away from the static contact 1, so that the arc-shaped spring piece 4 can press the contact block 201 to the greatest extent, and then the contact block 201 can press the static contact 1 and the conductive contact arm 5, thereby making the connection more stable.

[0048] Furthermore, the width of the connecting slot 207 is greater than the thickness of the collar block 301 .

[0049] It can be seen from the above description that the collar block 301 has a certain movement margin in the connecting slot 207 , which can better cooperate with the movement of the contact block 201 .

[0050] Embodiment 1

[0051] See also Figures 1 to 5 The knife handle-like moving contact structure system dedicated to the high current circuit breaker of this embodiment includes a fixed grid 3 and eight contact units. A central hole 303 is provided in the middle of the fixed grid 3. Each contact unit is arranged around the central hole 303, and each contact unit is evenly installed on the fixed grid 3 along the circumferential direction. One end of the contact unit is clamped with the conductive contact arm 5, and the other end is clamped and fitted with the static contact 1;

[0052] The contact unit includes a contact assembly 2 and an arc-shaped spring piece 4. The contact assembly 2 includes a contact block 201. A first slot 205 and a second slot 206 are provided on a side of the contact block 201 away from the center hole 303. The first slot 205 and the second slot 206 are symmetrically arranged with the perpendicular midline of the side of the contact block 201 away from the center hole 303 as the symmetry axis. An arc-shaped spring piece 4 is arranged between the first slot 205 and the second slot 206. Two ends of the arc-shaped spring piece 4 are respectively arranged inside the first slot 205 and the second slot 206.

[0053] The fixed grid 3 is provided with eight mounting slots 302 corresponding to the contact units one by one.

[0054] In this embodiment, the contact block 201 is made of copper, and the surface of the contact block 201 is plated with silver.

[0055] In this embodiment, the material of the fixed grid 3 is stainless steel.

[0056] Furthermore, the two ends of the contact block 201 close to the central hole 303 are respectively integrally connected with a contact block 203 and a clamping block 202; each clamping block 202 is clamped with the conductive contact arm 5, and each contact block 203 is clamped and fitted with the static contact 1.

[0057] Furthermore, a top-facing inclined surface 204 is provided on one side of the contact block 203 close to the stationary contact 1 , and the top-facing inclined surface 204 is inclined toward the clamping block 202 .

[0058] Furthermore, a connecting slot 207 is provided in the middle of the bottom end of the contact block 201 , and the connecting slot 207 is connected to a side of the mounting slot 302 close to the stationary contact 1 under the action of the arc-shaped spring piece 4 .

[0059] Furthermore, the fixed grid 3 includes a circular collar block 301 , the center of the central hole 303 coincides with the center of the collar block 301 ; a reinforcing ring 304 is integrally and vertically fixedly connected to the outer edge of the collar block 301 on one side close to the conductive contact arm 5 .

[0060] Furthermore, one end of the conductive contact arm 5 close to the stationary contact 1 is coaxially fixedly connected with a stepped shaft 501 , the stepped shaft 501 includes an outer shaft and an inner shaft connected as one piece, the diameter of the outer shaft is larger than the diameter of the inner shaft, and the inner shaft is fixedly connected to the conductive contact arm 5 .

[0061] Furthermore, a first arc-shaped groove 2021 is provided at the bottom end of the clamping block 202 to fit with the inner shaft surface of the stepped shaft 501 ; and a second arc-shaped groove 2031 is provided at the bottom end of the contact block 203 to fit with the surface of the static contact 1 .

[0062] Furthermore, the highest point of the protrusion of the arc-shaped spring piece 4 is in contact with a side of the mounting groove 302 away from the static contact 1 .

[0063] Furthermore, the width of the connecting slot 207 is greater than the thickness of the collar block 301 .

[0064] Further, the thickness of the contact block 201 is 8 cm, and the length of the contact block 201 is 45 cm;

[0065] The distance between the lowest point of the contact block 203 and the side of the contact block 201 away from the stationary contact 1 is 10.3 cm, and the distance between the lowest point of the clamping block 202 and the side of the contact block 201 away from the stationary contact 1 is 12.8 cm.

[0066] This embodiment can be used for a 630A circuit breaker.

[0067] Embodiment 2

[0068] The difference from the above-mentioned first embodiment is that the contact assemblies 2 of this embodiment are provided with 12 pieces.

[0069] This embodiment can be used for a 1250A circuit breaker.

[0070] The working principle of the present invention is as follows: by providing the mounting groove 302 for mounting the contact assembly 2 in the fixed grid 3, one or several contact assemblies 2 can be replaced or disassembled at any time. When the contact assembly 2 is damaged, it is not necessary to replace the entire contact assembly 2, thereby improving the applicability of the device. At the same time, by providing the arc-shaped spring piece 4 and the contact block 201, the arc-shaped spring piece 4 can always press the contact block 201, and then the two ends of the contact block 201 can respectively clamp the stationary contact 1 and the conductive contact arm 5, thereby ensuring the stability and tightness of the contact assembly 2 during the connection process, achieving a good connection, strong adaptability, and high working reliability.

[0071] When the static contact 1 is in connection, the end fillet of the static contact 1 matches with the top inclined surface 204, thereby opening the contact block 201 and allowing the static contact 1 to completely enter the interior of the contact assembly 2 and be clamped by the contact assembly 2;

[0072] When the stationary contact 1 is disconnected, the arc-shaped spring piece 4 can open the end of the contact block 201 close to the conductive contact arm 5, thereby achieving disconnection, which effectively improves the safety of the stationary contact 1 when disconnecting.

[0073] In the description of the present invention, it should be noted that the terms "inside", "outside", "upper", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0074] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0075] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Claims

1. A knife handle-like moving contact structure system dedicated to a high current circuit breaker, characterized in that: It comprises a fixed grid (3) and a plurality of contact units, wherein a central hole (303) is arranged in the middle of the fixed grid (3), each of the contact units is arranged around the central hole (303), and each of the contact units is evenly installed on the fixed grid (3) along the circumferential direction, and one end of the contact unit is clamped with the conductive contact arm (5), and the other end is clamped tightly with the stationary contact (1); The contact unit comprises a contact assembly (2) and an arc-shaped spring piece (4); the contact assembly (2) comprises a contact block (201); a first slot (205) and a second slot (206) are provided on a side of the contact block (201) away from the center hole (303); the first slot (205) and the second slot (206) are symmetrically arranged with the perpendicular midline of the side of the contact block (201) away from the center hole (303) as a symmetry axis; an arc-shaped spring piece (4) is arranged between the first slot (205) and the second slot (206); and two ends of the arc-shaped spring piece (4) are respectively arranged inside the first slot (205) and the second slot (206); The fixed grid (3) is provided with a plurality of mounting grooves (302) corresponding one to each contact unit.

2. The knife handle-like moving contact structure system dedicated to a high current circuit breaker according to claim 1, characterized in that: The two ends of the contact block (201) close to the central hole (303) are respectively integrally connected with a contact block (203) and a clamping block (202); each clamping block (202) is clamped with a conductive contact arm (5), and each contact block (203) is clamped and fitted with a stationary contact (1).

3. The knife handle-like moving contact structure system dedicated to a high current circuit breaker according to claim 2, characterized in that: A top-to-top inclined surface (204) is provided on one side of the contact block (203) close to the stationary contact (1), and the top-to-top inclined surface (204) is inclined towards the clamping block (202).

4. The knife handle-like moving contact structure system dedicated to a high current circuit breaker according to claim 3, characterized in that: A connecting slot (207) is provided in the middle of the bottom end of the contact block (201), and the connecting slot (207) is connected to a side of the mounting slot (302) close to the stationary contact (1) under the action of the arc-shaped spring sheet (4).

5. The knife handle-like moving contact structure system dedicated to a high current circuit breaker according to claim 4, characterized in that: The fixed grid (3) comprises a circular collar block (301), the center of the central hole (303) coincides with the center of the collar block (301); a reinforcing ring (304) is integrally and vertically fixedly connected to the outer edge of the collar block (301) on one side close to the conductive contact arm (5).

6. The knife handle-like moving contact structure system dedicated to a high current circuit breaker according to claim 5, characterized in that: One end of the conductive contact arm (5) close to the stationary contact (1) is coaxially fixedly connected to a stepped shaft (501), the stepped shaft (501) comprising an outer shaft and an inner shaft connected in one piece, the diameter of the outer shaft being greater than the diameter of the inner shaft, and the inner shaft being fixedly connected to the conductive contact arm (5).

7. The knife handle-like moving contact structure system dedicated to a high current circuit breaker according to claim 6, characterized in that: The bottom end of the clamping block (202) is provided with a first arc-shaped groove (2021) that fits with the inner shaft surface of the stepped shaft (501); The bottom end of the contact block (203) is provided with a second arc-shaped groove (2031) that fits the surface of the stationary contact (1).

8. The knife handle-like moving contact structure system dedicated to a high current circuit breaker according to claim 1, characterized in that: The highest point of the protrusion of the arc-shaped spring sheet (4) fits into the side of the installation groove (302) away from the static contact (1).

9. The knife handle-like moving contact structure system dedicated to a high current circuit breaker according to claim 5, characterized in that: The width of the connecting slot (207) is greater than the thickness of the collar block (301).

10. The knife handle-like moving contact structure system dedicated to a high current circuit breaker according to claim 1, characterized in that: The thickness of the contact block (201) is 8 cm, and the length of the contact block (201) is 45 cm; The distance between the lowest point of the contact block (203) and one side of the contact block (201) away from the stationary contact (1) is 10.3 cm, and the distance between the lowest point of the clamping block (202) and one side of the contact block (201) away from the stationary contact (1) is 12.8 cm.

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