Method for manufacturing a stationary contact

Abstract

This invention discloses a method for preparing a stationary contact, comprising: melting pure copper at high temperature and casting it into a mold to form a ring-shaped blank, wherein the blank has multiple mounting holes spaced apart circumferentially; grinding the inner surface of the blank using a grinding mechanism; cleaning the inner surface of the blank; forming a conductive layer on the inner surface of the blank, wherein the conductive layer is made of copper-tungsten alloy material and formed by high-temperature sintering using powder metallurgy technology; and grinding the mounting holes and the end face of the blank. The stationary contact obtained by the above method has improved strength, is resistant to arc erosion, and has an extended service life.

Description

Technical Field

[0001] This invention relates to the field of stationary contact technology, and more particularly to a method for preparing a stationary contact. Background Technology

[0002] High-voltage switchgear refers to electrical products used in power systems for switching, control, or protection in power generation, transmission, distribution, energy conversion, and consumption. High-voltage switchgear is categorized into several main types based on voltage levels from 3.6kV to 550kV, including high-voltage disconnect switches and grounding switches, high-voltage load switches, high-voltage automatic reclosers and sectionalizers, high-voltage operating mechanisms, high-voltage explosion-proof distribution devices, and high-voltage switchgear itself. Among these, stationary contacts have a significant impact on the overall performance of the switchgear.

[0003] The stationary contacts of existing high-voltage gas-filled switchgear are generally manufactured by melting copper blocks and then casting them using molds. However, existing stationary contacts suffer from severe arc erosion and require further improvement. Summary of the Invention

[0004] To address at least one technical problem existing in the background art, the present invention proposes a method for preparing a stationary contact.

[0005] The present invention proposes a method for preparing a stationary contact, comprising:

[0006] Pure copper is melted at high temperature and poured into a mold to form a ring-shaped blank, which has multiple mounting holes spaced around its circumference.

[0007] The inner surface of the blank is polished using a polishing mechanism;

[0008] Clean the inner surface of the blank;

[0009] A conductive layer is formed on the inner surface of the blank. The conductive layer is made of copper-tungsten alloy material and is formed by high-temperature sintering using powder metallurgy technology.

[0010] Grind the mounting holes and the end face of the blank.

[0011] Preferably, the outer surface of the blank is sandblasted.

[0012] Preferably, the polishing mechanism includes a polishing section, the polishing section comprising:

[0013] Multiple clamping members arranged circumferentially, each clamping member including a clamping rod, one end of which is provided with a clamping block, the clamping block being used to penetrate into the mounting hole, wherein the thickness of the clamping block is less than the depth of the mounting hole;

[0014] A clamping unit, which is used to move the plurality of clamping members closer or further apart;

[0015] Electric motor;

[0016] A grinding wheel, which is mounted on the output end of the motor;

[0017] The grinding mechanism also includes a first cylinder, which drives the motor to move so that the grinding wheel enters or leaves the inside of the blank.

[0018] Preferably, the polishing part further includes:

[0019] A support plate, the support plate being arranged below the blank;

[0020] A support block, which is mounted on the support plate, is used to enter or disengage from the lowermost mounting hole on the blank;

[0021] The grinding mechanism also includes a second cylinder, which is used to drive the support plate to rise and fall.

[0022] Preferably, the outer surface of the support block is in contact with the inner surface of the mounting hole.

[0023] Preferably, the support plate is arc-shaped.

[0024] Preferably, the polishing mechanism further includes:

[0025] A chute, the chute being arranged along the axis of the blank;

[0026] A slider, which is slidably connected to the slide groove; wherein, the second cylinder is mounted on the slider;

[0027] The third cylinder, the output end of which is connected to the slider.

[0028] Preferably, the grinding section further includes two spaced-apart receiving columns, which are positioned below the grinding wheel and on one side of the clamping block, for receiving the blank;

[0029] The polishing mechanism also includes a conveyor belt, wherein the receiving column is mounted on the conveyor belt.

[0030] Preferably, the clamping unit includes:

[0031] A first support member is provided with a plurality of first support grooves, each of which corresponds to a plurality of clamping members; the first support grooves are arranged radially along the blank.

[0032] The second support member has multiple second support grooves, each of which corresponds to a multiple clamping member; the second support groove is arc-shaped.

[0033] A bracket and a rotating shaft, wherein the rotating shaft is rotatably connected to the bracket and connected to the second support member;

[0034] A gear is mounted on the rotating shaft; wherein the clamping rod is located in the first support groove and the second support groove;

[0035] The grinding mechanism includes a rack and a fourth cylinder. The rack meshes with the gear, and the output end of the fourth cylinder is connected to the rack.

[0036] Preferably, the clamping rod is provided with two limiting rings, which are located on both sides of the second support member.

[0037] The beneficial effects of this invention are:

[0038] The static contact obtained by the above method has improved strength, is resistant to arc erosion, and has an extended service life.

[0039] Grinding is performed using a grinding mechanism, which facilitates subsequent processing. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the structure of the blank disclosed in this invention;

[0041] Figure 2 This is a schematic diagram of the polishing mechanism disclosed in this invention;

[0042] Figure 3 This is a schematic diagram of the polishing mechanism disclosed in this invention;

[0043] Figure 4 This is a cross-sectional view of the blank, etc., disclosed in this invention;

[0044] Figure 5 This is a schematic diagram of the first support member, etc., disclosed in this invention. Detailed Implementation

[0045] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0046] In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the indicated position or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or a transmission connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also refer to the internal communication of two elements or the interaction between two elements.

[0047] Reference Figure 1-5 The present invention proposes a method for preparing a stationary contact, comprising:

[0048] Pure copper is melted at high temperature and poured into a mold to form a ring-shaped blank A. The blank A has multiple mounting holes A1 spaced apart around its circumference.

[0049] The inner surface of blank A is polished using a polishing mechanism;

[0050] Clean the inner surface of blank A; a conductive layer is formed on the inner surface of blank A, the conductive layer being made of copper-tungsten alloy material and formed by high-temperature sintering using powder metallurgy technology; grind the mounting hole A1 and the end face of blank A. Sandblast the outer surface of blank A.

[0051] The static contact obtained by the above method has improved strength, is resistant to arc erosion, and has an extended service life.

[0052] Grinding is performed using a grinding mechanism, which facilitates subsequent processing.

[0053] As a further improvement to the above embodiments, in one implementation, the grinding mechanism includes a grinding section, which comprises: multiple clamping members arranged circumferentially, a clamping unit, a motor 3, and a grinding wheel 4. This embodiment can have multiple grinding sections spaced apart to simultaneously grind multiple blanks A, improving efficiency. This embodiment uses three clamping members.

[0054] The clamping component includes a clamping rod 1, and a clamping block 2 is provided at one end of the clamping rod 1. The clamping block 2 is used to penetrate into the mounting hole A1, wherein the thickness of the clamping block 2 is less than the depth of the mounting hole A1; in this way, the clamping block 2 does not protrude from the inner surface of the blank A, thus avoiding affecting the grinding of the grinding wheel 4.

[0055] The clamping unit is used to move multiple clamping components closer or further apart; the grinding wheel 4 is installed at the output end of the motor 3.

[0056] The grinding mechanism also includes a first cylinder 5, which is used to drive the motor 3 to move so that the grinding wheel 4 enters or leaves the inner side of the blank A.

[0057] By using the clamping unit to bring multiple clamping parts closer together, the clamping block 2 enters the mounting hole A1, which can clamp and fix the blank A and prevent the blank A from moving around in the circumferential direction.

[0058] The first cylinder 5 drives the motor 3 to move, allowing the grinding wheel 4 to enter the blank A. The motor 3 drives the grinding wheel 4 to rotate, thus polishing the inner surface of the blank A.

[0059] After grinding, remove grinding wheel 4. Separate the clamping parts and remove blank A.

[0060] As a further improvement to the above embodiments, in one embodiment, the grinding part further includes: a support plate 6 and a support block 7.

[0061] The support plate 6 is arranged below the blank A; the support block 7 is installed on the support plate 6 and is used to enter or exit the mounting hole A1 located at the bottommost position on the blank A.

[0062] The grinding mechanism also includes a second cylinder 8, which is used to drive the support plate 6 to rise and fall.

[0063] The blank A can be placed on the support plate 6, and the support block 7 can be placed in the lowest mounting hole A1. The second cylinder 8 is used to drive the support plate 6 to rise, so that the center of the three clamping parts coincides with the center of the blank A. Then the blank A can be clamped by the clamping parts.

[0064] After grinding, once the clamping block 2 separates from the mounting hole A1, the second cylinder 8 drives the support plate 6 to move, making it easier to remove the blank A.

[0065] As a further improvement to the above embodiments, in one implementation, the outer surface of the support block 7 is fitted with the inner surface of the mounting hole A1 to prevent the blank A from shifting.

[0066] As a further improvement to the above embodiments, in one implementation, the support plate 6 is arc-shaped. This facilitates support of the blank A and prevents it from shifting during rotation.

[0067] The polishing mechanism also includes: a slide groove 9, a slider 10, and a third cylinder 11.

[0068] The slide groove 9 is arranged along the axis of the blank A; the slider 10 is slidably connected to the slide groove 9; wherein, the second cylinder 8 is mounted on the slider 10; and the output end of the third cylinder 11 is connected to the slider 10.

[0069] After grinding is completed, and the clamping block 2 separates from the mounting hole A1, the third cylinder 11 drives the slider 10 and the second cylinder 8 to move laterally and leave the processing area.

[0070] As a further improvement to the above embodiments, in one embodiment, the grinding section further includes two spaced-apart receiving columns 12, the receiving columns 12 being placed below the grinding wheel 4 and on one side of the clamping block 2 for receiving the blank A; the grinding mechanism further includes a conveyor belt 13, wherein the receiving columns 12 are mounted on the conveyor belt 13.

[0071] After grinding, the blank A is moved between the two support columns 12. The second cylinder 8 is used to drive the blank A down, so that the blank A is placed on the two support columns 12. The support plate 6 continues to descend and separate from the blank A.

[0072] The conveyor belt 13 moves the receiving column 12 to remove the blank A, facilitating its subsequent removal.

[0073] Simply move the support plate 6 between the receiving column 12 and the clamping block 2, and then place the new blank A to be processed, which facilitates continuous processing.

[0074] As a further improvement to the above embodiments, in one embodiment, the clamping unit includes: a first support member 14, a second support member 15, a bracket 21, a rotating shaft 16, and a gear 17.

[0075] The first support member 14 is provided with a plurality of first support grooves 141, and the plurality of first support grooves 141 correspond one-to-one with a plurality of clamping members; the first support grooves 141 are arranged radially along the blank A.

[0076] The second support member 15 is provided with a plurality of second support grooves 151, and the plurality of second support grooves 151 correspond one-to-one with a plurality of clamping members; the second support grooves 151 are arc-shaped; the rotating shaft 16 is rotatably connected to the bracket 21 and connected to the second support member 15;

[0077] The gear 17 is mounted on the rotating shaft 16; wherein the clamping rod 1 is located in the first support groove 141 and the second support groove 151.

[0078] The grinding mechanism includes a rack 18 and a fourth cylinder 19. The rack 18 meshes with the gear 17, and the output end of the fourth cylinder 19 is connected to the rack 18.

[0079] The fourth cylinder 19 drives the rack 18 to move, which in turn drives the gear 17, the rotating shaft 16, and the second support member 15 to rotate. The second support groove 151 presses the clamping rod 1, causing the clamping rod 1 to move along the first support groove 141, clamping or releasing the blank A.

[0080] As a further improvement to the above embodiments, in one embodiment, the clamping rod 1 is provided with two limiting rings 20, and the two limiting rings 20 are located on both sides of the second support member 15.

[0081] To prevent the clamping rod 1 from disengaging from the second support groove 151.

[0082] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for preparing a stationary contact, characterized in that, include: Pure copper is melted at high temperature and poured into a mold to form a ring-shaped blank. Multiple mounting holes are spaced circumferentially on the blank. The inner surface of the blank is then polished using a polishing mechanism. The inner surface of the blank is cleaned. A conductive layer is formed on the inner surface of the blank, which is made of copper-tungsten alloy material and formed by high-temperature sintering using powder metallurgy technology. The mounting holes and the end faces of the blank are then polished. The grinding mechanism includes a grinding section, which comprises: a plurality of clamping members arranged circumferentially, each clamping member including a clamping rod, one end of which is provided with a clamping block for penetrating into the mounting hole, wherein the thickness of the clamping block is less than the depth of the mounting hole; a clamping unit for driving the plurality of clamping members to move closer or further apart; a motor; a grinding wheel mounted on the output end of the motor; a first cylinder for driving the motor to move so that the grinding wheel enters or disengages from the inner side of the blank; a support plate arranged below the blank; and a support block mounted on the support plate for entering or disengaging from the lowermost mounting hole on the blank. The grinding mechanism also includes a second cylinder, which is used to drive the support plate to rise and fall; The grinding section further includes two spaced-apart receiving columns, which are positioned below the grinding wheel and on one side of the clamping block to receive the blank; the grinding mechanism also includes a conveyor belt, wherein the receiving columns are mounted on the conveyor belt.

2. The method for preparing a stationary contact according to claim 1, characterized in that, The outer surface of the blank is sandblasted.

3. The method for preparing a stationary contact according to claim 2, characterized in that, The outer surface of the support block is in contact with the inner surface of the mounting hole.

4. The method for preparing a stationary contact according to claim 3, characterized in that, The support plate is arc-shaped.

5. The method for preparing a stationary contact according to claim 4, characterized in that, The polishing mechanism also includes: A chute, the chute being arranged along the axis of the blank; A slider, which is slidably connected to the slide groove; wherein, the second cylinder is mounted on the slider; The third cylinder, the output end of which is connected to the slider.

6. The method for preparing a stationary contact according to claim 1, characterized in that, The clamping unit includes: A first support member is provided with a plurality of first support grooves, each of which corresponds to a plurality of clamping members; the first support grooves are arranged radially along the blank. The second support member has multiple second support grooves, each of which corresponds to a multiple clamping member; the second support groove is arc-shaped. A bracket and a rotating shaft, wherein the rotating shaft is rotatably connected to the bracket and connected to the second support member; A gear is mounted on the rotating shaft; wherein the clamping rod is located in the first support groove and the second support groove; The grinding mechanism includes a rack and a fourth cylinder. The rack meshes with the gear, and the output end of the fourth cylinder is connected to the rack.

7. The method for preparing a stationary contact according to claim 6, characterized in that, The clamping rod is provided with two limiting rings, which are located on both sides of the second support member.

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