CN115662849B - Contact structure and circuit breaker with same - Google Patents
Contact structure and circuit breaker with same Download PDFInfo
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- CN115662849B CN115662849B CN202211366592.XA CN202211366592A CN115662849B CN 115662849 B CN115662849 B CN 115662849B CN 202211366592 A CN202211366592 A CN 202211366592A CN 115662849 B CN115662849 B CN 115662849B
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Abstract
The application provides a contact structure and a circuit breaker with the same, wherein the contact structure comprises: a stationary contact assembly; the movable contact assembly comprises a first movable contact and a second movable contact, the first movable contact is provided with a second cavity, and the second movable contact is inserted into the second cavity; the first driving assembly comprises a first gear, the first gear is arranged on the first movable contact, a first rack is arranged on the outer wall surface of the second movable contact, and the first gear is meshed with the first rack; the second driving assembly comprises a second gear which is rotatably arranged, a second rack is arranged on the first moving contact, the second gear is meshed with the second rack, and the first moving contact is driven to move through rotation of the second gear, so that the first gear arranged on the first moving contact is driven to move, and the first gear drives the second moving contact to move relative to the first moving contact. The application solves the problem of weaker breaking capacity of the contact structure of the circuit breaker in the prior art.
Description
Technical Field
The application relates to the technical field of circuit breakers, in particular to a contact structure and a circuit breaker with the same.
Background
The vacuum circuit breaker is named because the arc extinguishing medium and the insulating medium of the contact gap after arc extinction are high vacuum, has the advantages of small volume, light weight, suitability for frequent operation and no maintenance for arc extinction, and is more popular in power distribution networks. In the use process of the vacuum circuit breaker, an electric arc is easy to generate when a moving contact and a fixed contact of the vacuum circuit breaker are close, so that the switching-on and switching-off speed of the vacuum circuit breaker is required to be as fast as possible, the generation of the electric arc is reduced, and the damage to equipment is reduced.
At present, the isolating switch of the high-voltage combined electrical apparatus usually adopts a gear rack structure to realize the transmission of the moving contact assembly, thereby realizing the switching-on and switching-off of the moving contact assembly and the static contact assembly.
However, the opening speed of the rack and pinion structure in the prior art is low, and the blowing-out capability of the arc by opening and closing the existing rack and pinion structure is weak, so that the breaking capability of the isolating switch is weak.
Disclosure of Invention
The application mainly aims to provide a contact structure and a circuit breaker with the same, so as to solve the problem that the breaking capacity of the contact structure of the circuit breaker in the prior art is weaker.
In order to achieve the above object, according to one aspect of the present application, there is provided a contact structure including: a stationary contact assembly; the movable contact assembly comprises a first movable contact and a second movable contact, the first movable contact is provided with a second cavity, and the second movable contact is inserted into the second cavity; the first driving assembly comprises a first gear, the first gear is arranged on the first movable contact, a first rack is arranged on the outer wall surface of the second movable contact, and the first gear is meshed with the first rack; the second driving assembly comprises a second gear, the second gear is rotatably arranged, a second rack is arranged on the first moving contact, the second gear and the second rack are meshed with each other, and the first moving contact is driven to move through rotation of the second gear, so that the first gear mounted on the first moving contact is driven to move, and the first gear drives the second moving contact to move relative to the first moving contact.
Further, the contact structure includes: the support is provided with a first cavity, and the first moving contact is movably inserted into the first cavity; the second driving assembly is arranged on the support, a third rack which is opposite to the first rack is arranged on the inner wall surface of the first cavity of the support, and the first gear is meshed with the first rack and the third rack.
Further, the diameter of the addendum circle of the first gear is smaller than the diameter of the addendum circle of the second gear; and/or the outer wall surface of the first moving contact is provided with a mounting cavity communicated to the first rack, and the first driving assembly is mounted in the mounting cavity.
Further, the second moving contact is provided with a third cavity for inserting the fixed contact component; the second moving contact is provided with a communication channel, and the communication channel is communicated with the third cavity and the second cavity.
Further, the circumference of the cross section of the communication channel is smaller than the circumference of the cross section of the third cavity.
Further, the first driving component and the second driving component are respectively arranged at two sides of the center line of the first moving contact; the extending direction of the center line of the first moving contact is the moving direction of the second moving contact.
Further, the contact structure further includes: the first spring contact finger is arranged in the first groove part and is positioned between the first moving contact and the second moving contact; and/or the second driving assembly comprises a second driving motor, and an output shaft of the second driving motor is connected with the second gear.
Further, the contact structure further comprises a buffer piece, the buffer piece is located in the second cavity, one end of the buffer piece is connected with the first moving contact, and the other end of the buffer piece is connected with the second moving contact.
Further, the buffer piece is a spring; and/or the buffer members are a plurality of, and the buffer members are arranged at intervals around the circumference of the second moving contact.
According to another aspect of the present application, there is provided a circuit breaker including an arc extinguishing chamber and a contact structure disposed in the arc extinguishing chamber, the contact structure being the contact structure described above.
By applying the technical scheme of the application, the contact structure comprises a fixed contact assembly and a movable contact assembly, wherein the movable contact assembly comprises a first movable contact and a second movable contact, the first movable contact is provided with a second cavity, and the second movable contact is inserted into the second cavity; the first driving assembly comprises a first gear, the first gear is arranged on the first movable contact, a first rack is arranged on the outer wall surface of the second movable contact, and the first gear is meshed with the first rack; the second driving assembly comprises a second gear, the second gear is rotatably arranged, a second rack is arranged on the first moving contact, the second gear and the second rack are meshed with each other, the first moving contact is driven to move through rotation of the second gear, and accordingly the first gear mounted on the first moving contact is driven to move, the first gear drives the second moving contact to move relative to the first moving contact, the second moving contact is enabled to contact and close with the fixed contact assembly in advance, closing speed is enabled to be fast, and opening and closing capacity of the contact structure is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
fig. 1 shows a schematic diagram of the structure of a moving contact assembly and a stationary contact assembly according to an embodiment of the contact structure of the present application when the moving contact assembly and the stationary contact assembly are completely opened;
fig. 2 shows a schematic structural view of a first moving contact of the contact structure according to fig. 1;
fig. 3 shows a schematic diagram of a second moving contact of the contact arrangement according to fig. 1;
fig. 4 shows a schematic structural view of a closing process of a stationary contact assembly and a moving contact assembly according to an embodiment of a contact structure of the present application;
fig. 5 shows a schematic diagram of the structure of the static contact assembly and the moving contact assembly in a complete closing state according to an embodiment of the contact structure of the present application; and
fig. 6 shows a schematic structural diagram of a breaking process of a stationary contact assembly and a moving contact assembly according to an embodiment of a contact structure of the present application.
Wherein the above figures include the following reference numerals:
10. a stationary contact assembly; 11. static arc contacts; 12. a stationary main contact; 122. avoiding the cavity; 20. a moving contact assembly; 21. a first moving contact; 22. a second moving contact; 210. a second cavity; 220. a third cavity; 221. a communication passage; 40. a first drive assembly; 400. a first gear; 401. a first rotating shaft; 222. a first rack; 30. a support; 300. a first cavity; 301. an insertion space; 302. an installation space; 50. a second drive assembly; 31. a third rack; 211. a second rack; 500. a second gear; 501. a second rotating shaft; 111. a first groove portion; 121. a second groove portion; 131. a third groove portion; 60. a guide structure; 200. and installing the cavity.
Detailed Description
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
Referring to fig. 1 to 6, the present application provides a contact structure, including: a stationary contact assembly 10; the movable contact assembly 20, the movable contact assembly 20 comprises a first movable contact 21 and a second movable contact 22, the first movable contact 21 is provided with a second cavity 210, the second movable contact 22 is inserted into the second cavity 210, the first driving assembly 40 comprises a first gear 400, the first gear 400 is arranged on the first movable contact 21, a first rack 222 is arranged on the outer wall surface of the second movable contact 22, and the first gear 400 is meshed with the first rack 222; the second driving assembly 50, the second driving assembly 50 includes a second gear 500, the second gear 500 is rotatably disposed, the first moving contact 21 is provided with a second rack 211, the second gear 500 and the second rack 211 are engaged with each other, so that the first moving contact 21 is driven to move by the rotation of the second gear 500, and the first gear 400 mounted on the first moving contact 21 is driven to move, so that the first gear 400 drives the second moving contact 22 to move relative to the first moving contact 21.
The contact structure comprises a fixed contact assembly 10 and a movable contact assembly 20, wherein the movable contact assembly 20 comprises a first movable contact 21 and a second movable contact 22, the first movable contact 21 is provided with a second cavity 210, and the second movable contact 22 is inserted into the second cavity 210; the first driving assembly 40, the first driving assembly 40 includes a first gear 400, the first gear 400 is mounted on the first moving contact 21, the first rack 222 is disposed on the outer wall surface of the second moving contact 22, and the first gear 400 is meshed with the first rack 222; the second driving assembly 50, the second driving assembly 50 includes a second gear 500, the second gear 500 is rotatably disposed, the first moving contact 21 is provided with a second rack 211, the second gear 500 and the second rack 211 are engaged with each other, so as to drive the first moving contact 21 to move by the rotation of the second gear 500, thereby driving the first gear 400 mounted on the first moving contact 21 to move, so that the first gear 400 drives the second moving contact 22 to move relative to the first moving contact 21; in this way, the second moving contact 22 contacts with the fixed contact assembly in advance, so that the closing speed is increased, and the breaking capacity of the contact structure is improved.
Optionally, the contact structure further includes a first rotating shaft 401, where the first rotating shaft 401 is installed in the installation cavity 200 of the first moving contact 21, and the first gear 400 is sleeved on the first rotating shaft 401 and is fixedly connected with the first rotating shaft 401.
In an embodiment of the application, the contact structure comprises: the support 30, the support 30 has a first cavity 300, the first movable contact 21 is movably inserted in the first cavity 300, the second driving assembly 50 is installed on the support 30, the inner wall surface of the first cavity 300 of the support 30 is provided with a third rack 31 opposite to the first rack 222, the first gear 400 is meshed with both the first rack 222 and the third rack 31, so that the first gear 400 moves synchronously through the movement of the first movable contact 21, and the first gear 400 is driven to rotate under the meshing action of the third rack 31 and the first gear 400, so that the second movable contact 22 is driven to move through the meshing action of the first gear 400 and the first rack 222, and the movement of the first gear 400 is stable.
Specifically, the diameter of the addendum circle of the first gear 400 is smaller than that of the second gear 500, so that the linear speed of the first gear 400 is greater than that of the second gear 500, so that the movement speed of the second moving contact 22 is greater than that of the first moving contact 21, and the opening and closing speeds of the moving contact assembly 20 are improved, and the opening and closing capability of the contact structure is improved; and/or, the outer wall surface of the first moving contact 21 is provided with a mounting cavity 200 communicated with the first rack 222, the first driving component is positioned in the mounting cavity 200, and the first driving component 40 is mounted in the mounting cavity 200 so that the first gear 400 is meshed with the first rack 222.
Alternatively, the first gears 400 are plural, and the plural first gears 400 are disposed at intervals along the extending direction of the second moving contact 22; alternatively, the first racks 222, the third racks 31 and the first gears 400 are all plural, the plural first racks 222 are arranged at intervals around the circumference of the second moving contact 22, the plural third racks 31 are arranged at intervals around the circumference of the first cavity 300, the plural third racks 31 and the plural first racks 222 are arranged in one-to-one correspondence, and the plural first gears 400 and the plural first racks 222 are arranged in one-to-one correspondence.
Specifically, the first cavity 300 includes an insertion space 301 and an installation space 302 that are mutually communicated, the second gear 500 is installed in the installation space 302, the installation space 302 is in an arc-shaped structure to be matched with the second gear 500, and the first moving contact 21 is inserted in the insertion space 301.
Specifically, the second moving contact 22 has a third cavity 220 into which the fixed contact assembly 10 is inserted; the second moving contact 22 has a communication channel 221, where the communication channel 221 is communicated with the third cavity 220 and the second cavity 210, so that when the second moving contact 22 moves away from the fixed contact assembly 10, the second moving contact 22 compresses the gas in the second cavity 210 of the first moving contact 21, so that the gas flows through the communication channel 221 and the third cavity 220 in sequence and then blows out, so as to blow out the arc generated between the fixed contact assembly 10 and the moving contact assembly 20, improve the arc extinguishing capability of the contact structure, and further improve the breaking capability of the contact structure.
In the embodiment of the present application, the circumference of the cross section of the communication channel 221 is smaller than the circumference of the cross section of the third cavity 220, so that the air in the second cavity 210 flows through the communication channel 221 and then is blown out by the third cavity 220, so that the air flow is blown farther.
Specifically, the first driving assembly 40 and the second driving assembly 50 are disposed on both sides of the center line of the first moving contact 21, respectively; the extending direction of the center line of the first moving contact 21 is the moving direction of the second moving contact 22.
Specifically, the contact structure further includes a buffer member, where one end of the buffer member is located in the second cavity 210, and the other end of the buffer member is connected to the first moving contact 21, so that when the second moving contact 22 moves towards a side far away from the fixed contact assembly 10, the second moving contact 22 is abutted to the buffer member, so as to prevent collision between the second moving contact 22 and the first moving contact 21.
Optionally, the buffer is fixedly connected with the second moving contact 22.
Specifically, the buffer member is a spring; and/or, the buffer members are a plurality of, and the buffer members are arranged around the second moving contact 22 at intervals in the circumferential direction so as to enhance the buffer force through the buffer members.
Specifically, the stationary contact assembly 10, the moving contact assembly 20 and the support 30 of the present application are all made of conductive materials.
In the embodiment of the present application, the contact structure further includes a guiding structure 60, and the guiding structure 60 is disposed at one end of the third cavity 220 near the stationary contact assembly 10, so that the stationary arc contact is smoothly inserted into the third cavity 220 through the guiding structure 60.
Specifically, the contact structure further includes: a first groove part 111 is arranged on the inner wall surface of the second cavity 210 of the first moving contact 21, and the first spring contact finger is arranged in the first groove part 111 and positioned between the first moving contact 21 and the second moving contact 22; and/or the second driving assembly 50 includes a second driving motor, an output shaft of which is connected with the second gear 500.
Specifically, the contact structure further includes a second rotating shaft 501, and a second gear is sleeved on the second rotating shaft 501 and is fixedly connected with the second rotating shaft 501, and an output shaft of the second driving motor is connected with the second rotating shaft 501, so that the second rotating shaft 501 and the second gear 500 are driven to rotate by the second driving motor.
Specifically, the contact structure further includes: the second spring contact finger is provided with a second groove portion 121 on the inner wall surface of the first cavity 300 of the support 30, and the second spring contact finger is installed in the second groove portion 121 and located between the first moving contact 21 and the support 30.
Wherein, the first spring contact finger and the second spring contact finger are made of conductive materials so as to strengthen the conductive connection between the first moving contact 21 and the second moving contact 22 through the first spring contact finger and strengthen the conductive connection between the first moving contact 21 and the support 30 through the second spring contact finger.
Specifically, the contact structure further includes: the third spring contact finger, the static contact assembly 10 comprises a static arc contact 11 and a static main contact 12, the static arc contact 11 is inserted into a third cavity 220, the static main contact 12 is provided with an avoidance cavity 122 for avoiding the first moving contact 21, the static arc contact 11 is installed in the avoidance cavity 122, a third groove part 131 is formed in the inner wall surface of the avoidance cavity 122, and the third spring contact finger is installed in the third groove part 131 and located between the first moving contact 21 and the static main contact 12. Wherein the third spring contact finger is made of an electrically conductive material to strengthen the electrically conductive connection between the first movable contact 21 and the stationary main contact 12 by the third spring contact finger.
In the implementation process of the embodiment of the present application, as shown in fig. 4 to 6, during the closing process of the moving contact assembly 20 and the fixed contact assembly 10, the second driving motor drives the second gear 500 to rotate counterclockwise, so as to drive the second rack 211 and the first moving contact 21 to move to a side close to the fixed contact assembly 10; the first gear 400 installed on the first moving contact 21 moves synchronously with the first moving contact 21, at this time, the first gear 400 rotates clockwise under the action of the third rack 31, so that the first rack 222 and the second moving contact 22 are driven to move towards the direction approaching the fixed contact assembly 10, and since the size of the first gear 400 is smaller than that of the second gear 500, the movement speed of the first gear 400 is greater than that of the second gear 500, and the second moving contact 22 contacts with the first moving contact 21 in advance; the second moving contact 22 continues to move after the second moving contact 22 reaches the closing position after the first moving contact 21 contacts with the first spring contact finger, the second gear 500 stops moving, and the first moving contact 21 and the second moving contact 22 stop.
In the process of separating the movable contact assembly 20 and the fixed contact assembly 10, the second driving motor drives the second gear 500 to rotate clockwise, so that the second rack 211 and the first movable contact 21 are driven to move to one side far away from the fixed contact assembly 10; the first gear 400 installed on the first moving contact 21 moves synchronously with the first moving contact 21, at this time, under the action of the third rack 31, the first gear 400 rotates counterclockwise, so as to drive the first rack 222 and the second moving contact 22 to move in a direction away from the fixed contact assembly 10, and because the size of the first gear 400 is smaller than that of the second gear 500, the moving speed of the first gear 400 is greater than that of the second gear 500, so that the second moving contact 22 compresses the gas in the second cavity 210 of the first moving contact 21, and the gas flow sequentially flows through the communication channel 221 and the third cavity 220 and is blown out to blow out the electric arc generated in the opening process; after the second moving contact 22 continues to move until the end wall of the end, close to the fixed contact assembly 10, of the second moving contact 22 is aligned with the end wall of the end, close to the fixed contact assembly, of the first moving contact, the fixed contact assembly 10 and the moving contact assembly 20 are completely separated, the second gear 500 stops moving, and the first moving contact 21 and the second moving contact 22 stop.
In the embodiment of the application, the first moving contact and the second moving contact are both cylindrical, and the static arc contact is cylindrical.
The application also provides a circuit breaker, which comprises an arc extinguishing chamber and a contact structure, wherein the contact structure is arranged in the arc extinguishing chamber, and the contact structure is the contact structure.
From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:
the contact structure comprises a fixed contact assembly 10 and a movable contact assembly 20, wherein the movable contact assembly 20 comprises a first movable contact 21 and a second movable contact 22, the first movable contact 21 is provided with a second cavity 210, and the second movable contact 22 is inserted into the second cavity 210; the first driving assembly 40, the first driving assembly 40 includes a first gear 400, the first gear 400 is mounted on the first moving contact 21, the first rack 222 is disposed on the outer wall surface of the second moving contact 22, and the first gear 400 is meshed with the first rack 222; the second driving assembly 50, the second driving assembly 50 includes a second gear 500, the second gear 500 is rotatably disposed, the first moving contact 21 is provided with a second rack 211, the second gear 500 and the second rack 211 are engaged with each other, so that the first moving contact 21 is driven to move by the rotation of the second gear 500, and the first gear 400 mounted on the first moving contact 21 is driven to move, so that the first gear 400 drives the second moving contact 22 to move relative to the first moving contact 21. In this way, the second moving contact 22 contacts with the fixed contact assembly in advance, so that the closing speed is increased, and the breaking capacity of the contact structure is improved.
The above is only a preferred embodiment of the present application, and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (9)
1. A contact structure, comprising:
a stationary contact assembly (10);
a moving contact assembly (20), wherein the moving contact assembly (20) comprises a first moving contact (21) and a second moving contact (22), the first moving contact (21) is provided with a second cavity (210), and the second moving contact (22) is inserted into the second cavity (210);
the first driving assembly (40), the first driving assembly (40) comprises a first gear (400), the first gear (400) is installed on the first moving contact (21), a first rack (222) is arranged on the outer wall surface of the second moving contact (22), and the first gear (400) is meshed with the first rack (222);
the second driving assembly (50), the second driving assembly (50) comprises a second gear (500), the second gear (500) is rotatably arranged, the first moving contact (21) is provided with a second rack (211), the second gear (500) and the second rack (211) are meshed with each other, and the first moving contact (21) is driven to move through the rotation of the second gear (500), so that the first gear (400) arranged on the first moving contact (21) is driven to move, and the first gear (400) drives the second moving contact (22) to move relative to the first moving contact (21);
the support (30) is provided with a first cavity (300), and the first movable contact (21) is movably inserted into the first cavity (300); the second driving assembly (50) is mounted on the support (30), a third rack (31) opposite to the first rack (222) is arranged on the inner wall surface of the first cavity (300) of the support (30), and the first gear (400) is meshed with the first rack (222) and the third rack (31);
the diameter of the tip circle of the first gear (400) is smaller than the diameter of the tip circle of the second gear (500).
2. The contact structure according to claim 1, wherein,
the first movable contact (21) is provided with a mounting cavity (200) communicated to the first rack (222) on the outer wall surface, and the first driving assembly (40) is mounted in the mounting cavity (200).
3. The contact structure according to claim 1 or 2, characterized in that the second moving contact (22) has a third cavity (220) in which the stationary contact assembly (10) is inserted;
the second moving contact (22) is provided with a communication channel (221), and the communication channel (221) is communicated with the third cavity (220) and the second cavity (210).
4. A contact structure according to claim 3, characterized in that the perimeter of the cross section of the communication channel (221) is smaller than the perimeter of the cross section of the third cavity (220).
5. The contact structure according to claim 1 or 2, characterized in that the first drive assembly (40) and the second drive assembly (50) are arranged on both sides of the centre line of the first moving contact (21), respectively;
the extending direction of the center line of the first moving contact (21) is the moving direction of the second moving contact (22).
6. The contact structure according to claim 1 or 2, characterized in that the contact structure further comprises: a first groove part (111) is arranged on the inner wall surface of the second cavity (210) of the first moving contact (21), and the first spring contact finger is arranged in the first groove part (111) and is positioned between the first moving contact (21) and the second moving contact (22); and/or the number of the groups of groups,
the second driving assembly (50) comprises a second driving motor, and an output shaft of the second driving motor is connected with the second gear (500).
7. The contact structure according to claim 1 or 2, characterized in that the contact structure further comprises a buffer member located in the second cavity (210), one end of the buffer member being connected to the first moving contact (21), the other end of the buffer member being connected to the second moving contact (22).
8. The contact structure of claim 7, wherein,
the buffer piece is a spring; and/or the number of the groups of groups,
the number of the buffer pieces is multiple, and the buffer pieces are arranged at intervals around the circumference of the second moving contact (22).
9. A circuit breaker comprising an arc chute and a contact structure disposed within the arc chute, characterized in that the contact structure is the contact structure of any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211366592.XA CN115662849B (en) | 2022-10-31 | 2022-10-31 | Contact structure and circuit breaker with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211366592.XA CN115662849B (en) | 2022-10-31 | 2022-10-31 | Contact structure and circuit breaker with same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115662849A CN115662849A (en) | 2023-01-31 |
| CN115662849B true CN115662849B (en) | 2023-12-01 |
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ID=84994891
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211366592.XA Active CN115662849B (en) | 2022-10-31 | 2022-10-31 | Contact structure and circuit breaker with same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115662849B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5578806A (en) * | 1994-08-01 | 1996-11-26 | Abb Management Ag | Compressed gas-blast circuit breaker |
| EP0896350A2 (en) * | 1997-06-26 | 1999-02-10 | Siemens Aktiengesellschaft | High-voltage power circuit breaker with two arcing contacts moving in opposite directions |
| CN112635230A (en) * | 2020-10-21 | 2021-04-09 | 平高集团有限公司 | Circuit breaker and double-acting arc extinguishing chamber |
| CN112975731A (en) * | 2021-03-08 | 2021-06-18 | 平湖市金兔实业有限公司 | High-efficiency positioning device for honing crankshaft hole in crankcase and working method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1879207B1 (en) * | 2006-07-12 | 2017-04-19 | ABB Schweiz AG | Rack and pinion gear for a switch |
-
2022
- 2022-10-31 CN CN202211366592.XA patent/CN115662849B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5578806A (en) * | 1994-08-01 | 1996-11-26 | Abb Management Ag | Compressed gas-blast circuit breaker |
| EP0896350A2 (en) * | 1997-06-26 | 1999-02-10 | Siemens Aktiengesellschaft | High-voltage power circuit breaker with two arcing contacts moving in opposite directions |
| CN112635230A (en) * | 2020-10-21 | 2021-04-09 | 平高集团有限公司 | Circuit breaker and double-acting arc extinguishing chamber |
| CN112975731A (en) * | 2021-03-08 | 2021-06-18 | 平湖市金兔实业有限公司 | High-efficiency positioning device for honing crankshaft hole in crankcase and working method thereof |
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| Publication number | Publication date |
|---|---|
| CN115662849A (en) | 2023-01-31 |
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