A high-voltage circuit breaker contact finger spring assembly tool and method

Abstract

The application discloses a high-voltage circuit breaker contact finger spring assembling tool and method, and belongs to the field of high-voltage circuit breakers. According to the assembling structure characteristics and working principle, the dynamic and static side closing state structures are simulated, the contact finger sheet positioning assembly and the spring expansion assembly are designed, the problems that a large number of contact finger sheets are sequentially arranged and placed in a cylindrical shape and the spring expansion and opening problems are solved respectively, the contact finger sheet positioning assembly and the spring expansion assembly are combined, the spring expansion and the close-fitting are once completed on the contact finger sheet, the rapid assembly of the contact finger spring is realized, the contact finger sheet positioning assembly has the positioning shaft and the limiting sleeve of the elastic clamping structure, the single contact finger sheet is quickly inserted and limited, the structure is light and simple, the contact finger spring can be quickly assembled and disassembled, the assembling operation is easy and convenient, and the high-voltage circuit breaker contact finger spring assembling can be completed by only inserting slightly.

Description

Technical Field

[0001] This invention belongs to the field of high-voltage circuit breakers, specifically relating to a high-voltage circuit breaker contact finger spring assembly tooling and method. Background Technology

[0002] The stationary side contact finger spring structure of a high-voltage circuit breaker consists of dozens of contact fingers clamped together from the outside by springs, forming an elastic structure with a clamping force towards the center. In the free state, limited by the contact finger seat and shield, and by the internal tension of the springs, the contact fingers form a cylindrical shape with an inner diameter slightly smaller than the diameter of the moving contact (generally about 2mm smaller). When the moving contact is inserted into the stationary side contact fingers, the cylindrical arrangement of contact fingers is spread open from the inside and clamped by the outer spring tension. All contact fingers uniformly clamp the moving contact, forming good electrical contact and meeting the electrical contact performance requirements of high-voltage electrical equipment.

[0003] Because the springs in this structure are under tension, they are assembled within the closed area formed by the contact finger base, a ring of contact finger pieces, and the shield. The contact finger pieces are elastically clamped from the outside, while the inside is supported by the contact finger base and the shield. The components are intertwined during assembly, making conventional methods impossible. Assembling the contact finger pieces with the contact finger base and shield first prevents the spring from being installed, while installing the spring first prevents the contact finger pieces from being positioned and aligned. The large number of contact finger pieces, the high rigidity and tensile strength of the springs, and the difficulty in opening and fitting them onto the contact finger pieces make manual assembly impossible, resulting in a complex and difficult assembly process.

[0004] The assembly structure of the contact spring differs from previous self-operated contacts, watch strap contacts, and spring contacts. Lacking mature assembly experience and methods, conventional methods are difficult to use smoothly. Typically, a moving contact is used for positioning, tape is wrapped around and secured to the contact finger assembly, the spring is manually pulled onto the outer ring of the contact finger assembly, and then it is assembled with the contact finger seat and shielding cover. This assembly process is time-consuming and labor-intensive, and often a small error can ruin the entire process. Due to the difficulty of assembly, the contact spring assembly has become a bottleneck in product assembly, affecting normal product assembly.

[0005] It is evident that the existing assembly method cannot effectively position the arrangement of the contact finger pieces; the spring is difficult to fit into the groove on the outside of the contact finger piece; and the contact finger spring assembly structure cannot be smoothly assembled with the contact finger seat and shielding cover. Summary of the Invention

[0006] To solve the above-mentioned technical problems, the present invention provides a high-voltage circuit breaker contact spring assembly fixture and method. The fixture and assembly method can effectively position the arrangement of the contact plates; it can easily fit the spring into the outer groove of the contact plate; and it can also smoothly assemble the contact spring assembly structure with the contact plate seat and shielding cover.

[0007] To achieve the above objectives, the present invention employs the following technical content:

[0008] A high-voltage circuit breaker contact spring assembly fixture includes a contact finger positioning assembly and a spring expansion assembly that cooperates with it.

[0009] The finger-shaped positioning assembly includes a base plate, on which a limiting sleeve and a positioning shaft are arranged sequentially from the outside to the inside; a cylindrical annular inner cavity is formed between the limiting sleeve and the positioning shaft, and the cylindrical annular inner cavity is used to arrange the finger-shaped pieces in an array;

[0010] The spring expansion assembly includes an expansion cylinder, into which a compression spring bracket is inserted; the compression spring bracket is capable of axial sliding within the expansion cylinder.

[0011] When assembling the contact finger spring of the high-voltage circuit breaker, the top of the positioning shaft is located in the bottom inner hole of the expansion cylinder.

[0012] Furthermore, a rubber ring assembly groove is provided on the inner wall of the limiting sleeve; a rubber ring is provided in the rubber ring assembly groove, and the rubber ring is used to press the contact finger piece.

[0013] Furthermore, the base plate is circular, and multiple sets of stepped structures are provided on the base plate, with the limiting sleeve and the positioning shaft respectively located on the stepped structures.

[0014] Furthermore, the limiting sleeve is cylindrical, and the height of the limiting sleeve exceeds the center of the length of the finger piece.

[0015] Furthermore, the expanding cylinder has a conical structure, and radially arranged non-through grooves are formed on the circumference of the expanding cylinder from the small end to the large end.

[0016] Furthermore, the compression spring bracket is I-shaped and includes an integrally formed handle, a branch tube, and a finger plate; the finger plate is radially oriented and located at the bottom of the branch tube; the finger plate is correspondingly inserted into the through groove and can slide along the axial direction of the through groove.

[0017] Furthermore, a pull-out structure is provided on the positioning shaft;

[0018] The pull-out structure is a boss set in the inner hole of the positioning shaft, or a welded handle connected to the positioning shaft.

[0019] A method for assembling high-voltage circuit breaker contact springs, based on the aforementioned high-voltage circuit breaker contact spring assembly fixture, includes:

[0020] S1: Assemble the base plate, limiting sleeve and positioning shaft into a finger positioning assembly, and insert the finger pieces one by one into the cylindrical annular inner cavity;

[0021] S2: Using a compression spring bracket and an expansion sleeve, two springs are pressed into the spring mounting slots of the contact finger piece in sequence to form an assembly;

[0022] S3: Insert the contact finger seat into the bottom of the assembly, put the shielding cover on the top of the assembly, and pull the positioning shaft out of the assembly. The high-voltage circuit breaker contact finger spring assembly is complete.

[0023] Furthermore, the specific steps of S2 include:

[0024] S21: Fit the first spring onto the small end of the expansion tube, and press down the spring support so that the first spring slides to the large end of the expansion tube;

[0025] S22: Continue to press down the spring bracket so that the first spring slides into the first spring mounting slot of the contact finger piece to form a pre-assembled body;

[0026] S23: Remove the base plate and the limiting sleeve, rotate the pre-assembled body 180°, and repeat S21 and S22 so that the second spring slides into the second spring mounting groove of the contact finger piece to form the assembly.

[0027] Furthermore, a rubber ring is installed on the inner wall of the limiting sleeve, and the contact finger pieces are inserted one by one into the cylindrical annular inner cavity, using the rubber ring to press the contact finger pieces tightly.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] This invention provides a high-voltage circuit breaker contact spring assembly fixture. Based on the assembly structure characteristics and working principle, it simulates the dynamic and static side closing states and designs a contact spring positioning component and a spring expansion component. These components respectively solve the problems of arranging a large number of contact springs one by one into a cylindrical shape and the problem of spring expansion. By combining the contact spring positioning component and the spring expansion component, the spring expansion and clamping are completed on the contact spring in one step, achieving rapid assembly of the contact spring. The contact spring positioning component has a positioning shaft and a limiting sleeve with an elastic clamping structure, which enables quick insertion and limiting of a single contact spring. The structure is lightweight and simple, allowing for quick assembly and disassembly. The assembly operation is easy and convenient, requiring only a gentle insertion.

[0030] The spring expansion assembly utilizes an expansion cylinder, combined with the smooth downward pressure of a compression spring bracket, to easily expand springs that are impossible to do manually. The connection between the expansion cylinder and the positioning shaft allows for a seamless process of spring expansion and insertion into the contact finger piece, making it simple and practical. The contact finger piece, held in place by the spring clamp, can be freely moved and assembled with the positioning shaft, easily completing its assembly with the contact finger seat and shielding cover.

[0031] Preferably, a rubber ring assembly groove is formed on the inner wall of the limiting sleeve of the present invention, and a rubber ring is installed in the assembly groove. During installation, the surface of the rubber ring is higher than the inner surface of the limiting sleeve. In this way, the elastic deformation of the rubber ring presses the inserted finger pieces tightly to prevent the finger pieces from tipping over.

[0032] Preferably, the present invention uses a circular base plate with multiple sets of stepped structures. In this way, the limiting sleeve and the positioning shaft are positioned through the stepped structures, and the three work together to form a finger-positioning assembly for effective positioning of the finger piece.

[0033] Preferably, the present invention uses a cylindrical limiting sleeve, and the height of the limiting sleeve is set to exceed the length center of the finger piece. This makes it easy to straighten the finger piece from the waist position to prevent the finger piece from tipping over.

[0034] Preferably, the present invention uses a conical expansion cylinder, and with a suitable conical angle, it cooperates with the smooth pressing of the compression spring bracket, which makes it easy to open the spring support that cannot be done manually.

[0035] Preferably, the spring support of the present invention includes radially shaped finger plates that cooperate with radially shaped slots of the expansion cylinder. During the pressing of the finger plates, the spring can be evenly compressed. The spring is gradually stretched open with axial movement until it slides to the maximum end of the expansion cylinder, which facilitates the easy completion of the spring compression operation.

[0036] Preferably, the positioning shaft of the present invention is provided with a pull-out structure. One type of pull-out structure is a boss structure in the inner hole of the positioning shaft, and the other type is a welded handle, which makes it easy for the positioning shaft to be manually pulled out from the opening of the shield after assembly.

[0037] This invention also provides a method for assembling high-voltage circuit breaker contact springs. Based on the above-mentioned high-voltage circuit breaker contact spring assembly fixture, this method can effectively solve the problems of difficult placement of contact plates, difficult spring opening, and complex spring sleeve operation during the assembly process. The entire assembly process is simple, practical, lightweight, quick, easy to operate, and highly practical and operable.

[0038] Preferably, at the end of the assembly process, the positioning shaft serves as an auxiliary tool. During the assembly of the contact finger piece and the contact finger seat, the positioning shaft is axially pushed, and the limiting function of the inner side of the contact finger piece is replaced by the contact finger seat. Pulling the positioning shaft out from one side of the shielding cover completes the assembly of the contact finger spring. The limiting function of the positioning shaft is replaced by the contact finger seat and the shielding cover. This method is convenient and highly practical. Attached Figure Description

[0039] Figure 1 A schematic diagram of the structure of a high-voltage circuit breaker contact finger spring assembly fixture provided in an embodiment of the present invention;

[0040] Figure 2 This is a schematic diagram of the structure of the finger positioning assembly provided in an embodiment of the present invention;

[0041] Figure 3 This is a schematic diagram of the structure of the spring expansion assembly provided in an embodiment of the present invention;

[0042] Figure 4 The diagram shows the structure of the expansion tube provided in the embodiment of the present invention, wherein (a) is a side view and (b) is a top view;

[0043] Figure 5 The diagram shows the structure of the compression spring bracket provided in an embodiment of the present invention, wherein (a) is a side view and (b) is a top view;

[0044] Figure 6 A schematic diagram of the assembly of the contact finger spring, contact finger seat, and shielding cover provided in an embodiment of the present invention;

[0045] Figure 7 is a schematic diagram of the assembly process of a high-voltage circuit breaker contact spring according to an embodiment of the present invention. In Figure 7(a), a schematic diagram of inserting one ring of contact fingers is shown; Figure 7(b) a schematic diagram of the completed placement of the contact fingers is shown; Figure 7(c) a schematic diagram of the connection between the expansion cylinder and the positioning shaft is shown; Figure 7(d) a schematic diagram of pressing the first spring is shown; Figure 7(e) a schematic diagram of completing the pressing and assembly of the first spring is shown; Figure 7(f) a schematic diagram of pressing the second spring is shown; Figure 7(g) a schematic diagram of the completed pressing of the contact fingers and spring is shown; Figure 7(h) a schematic diagram of the assembly of the positioning shaft with the contact fingers and the contact finger seat is shown; Figure 7(i) a schematic diagram of assembling the shielding cover is shown; Figure 7(j) a schematic diagram of the completed assembly of the shielding cover is shown; Figure 7(k) a schematic diagram of withdrawing the positioning shaft is shown; and Figure 7(l) a schematic diagram of the completed assembly of the stationary side contact fingers is shown.

[0046] Figure label:

[0047] 1. Base plate; 2. Rubber ring; 3. Limiting sleeve; 4. Positioning shaft; 5. Expanding cylinder; 6. Compression spring bracket; 7. Spring; 8. Contact finger plate; 9. Through slot; 10. Finger plate; 11. Contact finger seat; 12. Shielding cover; 13. Handle; 14. Branch pipe. Detailed Implementation

[0048] To make the technical problems solved by the present invention, the technical solutions, and the beneficial effects clearer, the following specific embodiments provide a further detailed description of the present invention. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of the invention.

[0049] This invention provides a high-voltage circuit breaker contact spring assembly fixture, including a contact finger positioning assembly and a spring expansion assembly that cooperates with it;

[0050] The finger-shaped positioning assembly includes a base plate 1, on which a limiting sleeve 3 and a positioning shaft 4 are arranged sequentially from the outside to the inside; a cylindrical annular inner cavity is formed between the limiting sleeve 3 and the positioning shaft 4, and the cylindrical annular inner cavity is used to arrange the finger-shaped pieces 8 in an array;

[0051] The spring expansion assembly includes an expansion cylinder 5, and a compression spring bracket 6 is inserted inside the expansion cylinder 5; the compression spring bracket 6 is axially sliding in the expansion cylinder 5;

[0052] When assembling the contact finger spring of the high-voltage circuit breaker, the top of the positioning shaft 4 is located in the bottom inner hole of the expansion cylinder 5.

[0053] The specific structure is as follows: a rubber ring assembly groove is provided on the inner wall of the limiting sleeve 3; a rubber ring 2 for pressing the contact finger piece 8 is provided in the rubber ring assembly groove. During installation, the surface of the rubber ring 2 is higher than the inner surface of the limiting sleeve 3. In this way, the elastic deformation of the rubber ring 2 presses the contact finger pieces 8 inserted one by one to prevent the contact finger pieces 8 from tipping over.

[0054] The aforementioned base plate 1 is circular, and multiple sets of stepped structures are provided on the base plate 1. The limiting sleeve 3 and the positioning shaft 4 are respectively located on the stepped structures. The limiting sleeve 3 and the positioning shaft 4 achieve positioning through the stepped structures. Then, the three work together to form a finger-positioning assembly, which effectively positions the finger-positioning piece 8.

[0055] More specifically, the limiting sleeve 3 is cylindrical, and the height of the limiting sleeve 3 exceeds the center of the length of the finger piece 8, so as to straighten the finger piece 8 from the waist position and prevent the finger piece 8 from tipping over.

[0056] The expansion cylinder 5 is designed as a conical structure, and with a suitable conical angle, it cooperates with the compression spring bracket to smoothly press down, making it easy to open the spring support that cannot be done manually; in addition, the expansion cylinder 5 has radially open slots 9 from the small end to the large end in the circumferential direction.

[0057] Correspondingly, the compression spring bracket 6 adopts an I-shaped structure, which includes an integrally formed handle 13, a branch tube 14 and a finger plate 10; the finger plate 10 is radial and located at the bottom of the branch tube 14; the finger plate 10 is inserted into the through groove 9 and can slide along the axial direction of the through groove 9.

[0058] The positioning shaft 4 is provided with a pull-out structure; the pull-out structure can be set as a boss on both sides of the inner hole of the positioning shaft 4, or as a structure that is easy to grasp manually, such as a welded handle connected to the positioning shaft 4.

[0059] The present invention also provides a method for assembling high-voltage circuit breaker contact springs, based on the above-mentioned high-voltage circuit breaker contact spring assembly fixture, comprising:

[0060] S1: Assemble the base plate 1, the limiting sleeve 3 and the positioning shaft 4 into a finger positioning assembly, and insert the finger pieces 8 one by one into the cylindrical annular inner cavity;

[0061] Specifically, a rubber ring 2 is installed on the inner wall of the limiting sleeve 3, and the contact finger pieces 8 are inserted one by one into the cylindrical annular inner cavity. The rubber ring 2 is used to press the contact finger pieces 8 tightly, which can prevent the contact finger pieces 8 from tipping over.

[0062] S2: Using the spring support 6 and the expansion tube 5, the two springs are pressed into the spring mounting groove of the contact finger piece 8 in sequence to form an assembly;

[0063] The specific steps of S2 are as follows:

[0064] S21: Fit the first spring onto the small end of the expansion tube 5, and press down the spring support 6 so that the first spring slides to the large end of the expansion tube 5;

[0065] S22: Continue to press down the spring bracket 6 so that the first spring slides into the first spring mounting groove of the finger piece 8 to form a pre-assembled body;

[0066] S23: Remove the base plate 1 and the limiting sleeve 3, rotate the pre-assembled body 180°, repeat S21 and S22, so that the second spring slides into the second spring mounting groove of the contact finger piece 8 to form the assembly.

[0067] S3: Insert the contact finger seat 11 into the bottom of the assembly, put the shielding cover on the top of the assembly, and pull the positioning shaft 4 out of the assembly. The high voltage circuit breaker contact finger spring assembly is complete.

[0068] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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 some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0069] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0070] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0071] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0072] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0073] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0074] The present invention will now be described in further detail with reference to the accompanying drawings:

[0075] Example

[0076] To facilitate a better understanding of this invention, the technical terms used in this field are explained as follows:

[0077] ① Contact Finger: The stationary side structure of electrical contacts in high-voltage electrical products, typically in various forms such as contact finger plates, spring contacts, self-operated contacts, and plum blossom contacts. The assembly structure is an elastic cylindrical structure with an inward clamping force. The moving side is cylindrical; when the moving and stationary sides are inserted, they elastically clamp the moving contact, achieving reliable contact.

[0078] ② Moving contact: The moving side contact of the arc-extinguishing chamber or a cylinder-like part, is cylindrical in shape. It makes contact with the stationary side contact finger through an insert-type clamping engagement and is pulled out to separate, that is, to achieve the opening and closing action, realizing the flow and disconnection of the moving and stationary sides.

[0079] ③ Finger base: The base for connecting and fixing the finger assembly.

[0080] ④ Shielding cover: A thin-walled, arc-shaped covering part used to improve the uniformity of electric field distribution and absorb arc energy. It is generally installed on moving contacts, stationary contacts, and contact fingers.

[0081] As mentioned in the background section, the assembly structure of this contact spring differs from previous self-operated contacts, watchband contacts, and spring contacts. It lacks mature assembly experience and methods, making successful assembly difficult using conventional methods. Typically, a moving contact is used for positioning, tape is wrapped around and secured to the contact finger assembly, the spring is manually pulled onto the outer ring of the contact finger assembly, and then it is assembled with the contact finger seat and shielding cover. This assembly process is time-consuming and labor-intensive, and often a small error can ruin the entire process. Due to the assembly difficulties, the contact spring assembly becomes a bottleneck in product assembly, affecting normal product assembly.

[0082] To address the aforementioned problems, this embodiment provides a high-voltage circuit breaker contact spring assembly fixture and method, primarily solving the problems of cylindrical positioning and arrangement of the contact fingers, opening and clamping the contact fingers with two springs, and assembling the contact springs with the contact finger seats and shielding covers. Using this fixture, the contact fingers can be quickly inserted and arranged, the springs can be smoothly opened and pressed in, and the contact springs can be quickly assembled with the contact finger seats and shielding covers. The assembly operation is simple, and the process is stable, safe, and smooth.

[0083] like Figure 1 As shown, this embodiment provides a high-voltage circuit breaker contact finger spring assembly fixture, the specific structure of which includes:

[0084] The base plate 1, rubber ring 2, limiting sleeve 3, positioning shaft 4, expansion sleeve 5, and compression spring bracket 6 have the following structure and connection relationship:

[0085] like Figure 2 As shown, a finger positioning assembly is formed by a base plate 1, a limiting sleeve 3, and a positioning shaft 4. This assembly simulates the size of the moving contact. The positioning shaft 4 is cylindrical, with an outer diameter matching that of the moving contact. The positioning shaft 4 is placed on the positioning base plate 1. A limiting sleeve 3 is installed on the outer side of the finger piece 8. The positioning shaft 4, limiting sleeve 3, and base plate 1 cooperate to form an annular space for the finger piece 8 to be inserted and assembled with uniform gaps. A rubber ring 2 is installed on the inner side of the limiting sleeve 3. The elasticity of the rubber ring 2 ensures that the inserted finger piece 8 can be smoothly inserted without tilting, maintaining a vertical position. Using the positioning shaft 4 and limiting sleeve 3, the finger pieces are inserted one by one to assemble them into the cylindrical shape required by the drawing, i.e., the finger piece assembly.

[0086] like Figure 3 As shown, the spring expansion assembly consists of the expansion cylinder 5 and the compression spring bracket 6, as follows: Figure 4 (a) and Figure 4 As shown in (b), the spring expansion assembly uses a conical expansion cylinder 5. The expansion cylinder 5 has radially grooved sections from the small end, i.e., non-through grooves 9, as shown in... Figure 5 (a) and Figure 5 As shown in (b), the radial pressure plates (i.e., finger plates 10) of the compression spring bracket 6 can slide along the axial direction of the expansion cylinder 5. During assembly, the spring 7, which is connected end to end to form a ring, is inserted from the small end of the expansion cylinder 5, and the compression spring bracket 6 is pressed down from the small end of the expansion cylinder to push the spring to move axially and gradually expand.

[0087] For example Figure 1As shown, when the spring 7 expands and clamps the contact finger piece 8 during assembly, the large end of the expanding cylinder 5 is positioned in conjunction with the positioning shaft 4, and the outer diameter of the large end of the expanding cylinder 5 is consistent with the outer diameter of the contact finger piece 8. When the spring 7 is pressed down by the compression spring bracket 6, it expands along the expanding cylinder 5 and continues to slide down, sliding into the spring clamping position (i.e., the spring mounting groove) of the group of contact finger pieces 8 on the positioning shaft 4, thus completing the assembly of the first spring. The contact finger piece group is then flipped together with the positioning shaft 4 to press in another spring 7, completing the assembly of the contact finger piece 8 with the two springs 7.

[0088] The structure of a high-voltage circuit breaker contact spring assembly fixture provided in this embodiment will be described in more detail below with reference to the accompanying drawings:

[0089] The high-voltage circuit breaker contact spring assembly fixture includes: a contact finger positioning assembly consisting of a base plate 1, a rubber ring 2, a limit sleeve 3, and a positioning shaft 4, and a spring expansion assembly consisting of an expansion cylinder 5 and a compression spring bracket 6.

[0090] The contact finger positioning assembly uses a base plate 1 to position the positioning shaft 4 and the limiting sleeve 3, ensuring that the positioning shaft 4 and the limiting sleeve 3 are coaxial and form a uniform cylindrical gap. The gap width is 0.5mm larger than the thickness of the contact finger 8, allowing for smooth insertion of the contact finger 8. The outer diameter of the positioning shaft 4 simulates the size of the moving contact to ensure that the assembly shape of the contact finger 8 conforms to the structural requirements of the drawing.

[0091] The inner hole of the positioning shaft 4 is designed with a groove structure, which facilitates gripping and pulling out during final assembly. The length of the positioning shaft 4 is 10mm longer than that of the contact finger piece 8. After the expansion cylinder 5 is connected to the positioning shaft 4, the end face of the expansion cylinder 5 and the contact finger piece 8 can be perfectly aligned.

[0092] A circular rectangular groove is provided on the inner side of the limiting sleeve 3, and a rubber ring 2 is installed there. The rubber ring 2 protrudes 1mm from the rectangular groove. By utilizing the elasticity of the rubber ring 2, the sequentially inserted contact fingers are elastically pressed, which can ensure that the contact fingers are arranged vertically.

[0093] The base plate 1, limit sleeve 3, and positioning shaft 4 are all made of aluminum with a hard anodized finish to ensure a tight fit, making assembly and disassembly easy and convenient.

[0094] The expansion tube 5 is a thin-walled conical tube made of aluminum, such as... Figure 4 (a) and Figure 4 As shown in (b), eight evenly distributed through slots are opened from the small end to 20mm from the large end. The outer diameter of the large end of the expansion cylinder 5 is consistent with the outer diameter of the contact finger assembly, and the inner diameter is in small clearance fit with the positioning shaft 4.

[0095] The compression spring bracket 6 is a welded aluminum structure, consisting of a handle, a support tube, and a finger plate. The finger plate 10 has 8 evenly distributed toothed segments, which can slide axially along the 8 evenly distributed slots 9 of the expansion cylinder 5.

[0096] The conical small end of the expansion cylinder 5 is fitted with the annular tension spring 7 connected end to end. By axially pressing down through the compression spring bracket 6, the spring 7 is gradually expanded until it is expanded to the large end of the expansion cylinder 5, reaching the spring 7 assembly state, and can smoothly slide into the groove of the group of contact finger pieces 8.

[0097] The positioning shaft 4 can be easily flipped along with the contact finger assembly to allow the spring 7 at the other end to be inserted.

[0098] like Figure 6 As shown, the positioning shaft 4 carries the contact finger and spring wrapped around it, and is assembled with the contact finger seat 11 and the shield 12 in sequence. The shield 12 is pressed to fit the contact finger seat 11, and the contact finger seat 11 pushes out of the positioning shaft 4 to replace one end of the limiting contact finger assembly.

[0099] The inner hole of the positioning shaft 4 is provided with a groove, which makes it easy to grasp manually. The positioning shaft 4 can be pulled out from one side of the shielding cover 12, so that the side of the shielding cover 12 near the contact finger assembly is limited by the shielding cover 12 instead of the positioning shaft 4.

[0100] This embodiment also provides a method for assembling high-voltage circuit breaker contact finger springs, combined with... Figures 7(a) to 7(l) The specific steps are as follows:

[0101] Step 1: Assemble the base plate 1, the limiting sleeve 3, and the positioning shaft 4 into a finger positioning assembly.

[0102] Step Two: As Figure 7(a) and 7(b) As shown, the finger pieces 8 are inserted one by one, and the omnidirectional limiting and elastic compression can complete the cylindrical arrangement of the finger piece group. The finger pieces 8 are placed. Here, a rubber ring 2 can be installed on the inner wall of the limiting sleeve 3. The finger pieces 8 are inserted one by one into the cylindrical annular inner cavity. The rubber ring 2 is used to compress the finger pieces 8, which can prevent the finger pieces 8 from tipping over.

[0103] Step 3: As shown in Figure 7(c), the compression spring bracket 6 and the expansion cylinder 5 are combined to form a spring expansion assembly, ensuring that the expansion cylinder 5 is engaged with the positioning shaft 4, and that the large end of the expansion cylinder 5 is basically flush with the outer circle of the contact finger assembly.

[0104] Step 4: As shown in Figure 7(d), the spring 7 is fitted onto the small end of the expansion cylinder 5, and the compression spring bracket 6 is pressed down from the small end of the expansion cylinder 5, with its radial finger plates 10 evenly pressing the spring 7.

[0105] Step 5: As shown in Figure 7(e), the compression spring bracket 6 continues to press down, and the spring 7 is gradually stretched open with the axial movement until it slides to the maximum end of the expansion cylinder 5. The compression spring bracket 6 continues to press down, and the spring 7 slides into the spring mounting groove of the contact finger assembly with inertia.

[0106] Step 6: As shown in Figure 7(f), the positioning shaft 4 rotates 180° with the finger plate group held by a single spring 7 to complete the compression spring assembly of the second spring 7. The finger plate group and spring 7 are held tightly on the positioning shaft 4, as shown in Figure 7(g). The pre-assembled body is completed, that is, the compression spring of the finger plate 8 is completed.

[0107] Step 7: As shown in Figures 7(h) and 7(i), the positioning shaft 4 carries the finger plate assembly and spring, and is assembled with the finger seat 11 and the shield 12. The limiting function of the positioning shaft 4 is replaced by the finger seat 11 and the shield 12. As shown in Figure 7(j), the assembly is completed, that is, the assembly of the finger seat 11 and the shield 12 is completed.

[0108] Step 8: As shown in Figure 7(k), pull the positioning shaft 4 out of the assembly. The high-voltage circuit breaker contact finger spring assembly is completed, as shown in Figure 7(l).

[0109] This embodiment provides a high-voltage circuit breaker contact spring assembly fixture and method. By analyzing the opening and closing principle of the moving and stationary sides, a contact finger positioning shaft and limiting sleeve are designed to simulate the moving contact. The contact fingers are inserted sequentially and arranged in a cylindrical shape around the positioning shaft to complete the contact finger placement. A spring expansion fixture is designed, consisting of a conical expansion cylinder and a plum blossom-shaped compression spring bracket. The conical cylinder has evenly distributed through slots, and the compression spring bracket has the same finger plates. By pressing down on the compression spring bracket, the annular spring moves axially along the expansion cylinder, gradually expanding and sliding into the groove on the outside of the cylindrical contact finger, so that the spring clamps the contact finger on the positioning shaft fixture. The positioning shaft, together with the contact finger and the spring, is assembled with the contact finger seat and the shielding cover, so that the contact finger seat and the shielding cover extend into the inner holes at both ends of the cylindrical contact finger arrangement, limiting and supporting the contact finger assembly from the inside. Pull out the positioning shaft from one side of the shield. Under the action of spring tension, the two ends of the contact finger assembly hug the contact finger seat and the shield inward, forming a contact finger spring structure with a hugging force, thus completing the contact finger spring assembly.

[0110] Compared with existing assembly methods, this embodiment has the following advantages:

[0111] To address the problem of the inability to assemble the stationary side contact spring structure of circuit breakers, based on the assembly structure characteristics and working principle, a simulated dynamic and stationary side closing state structure was designed. A cylindrical placement fixture for the contact pieces and a spring expansion fixture were designed to solve the problems of arranging a large number of contact pieces into a cylindrical shape one by one and the spring expansion fixture, respectively. The contact piece placement and spring expansion fixtures were combined to complete the spring expansion and clamping on the contact piece in one step, achieving rapid assembly of the contact spring.

[0112] The positioning shaft, limiting sleeve, and rubber ring structure with elastic clamping mechanism for the contact finger pieces enable quick insertion and positioning of individual contact finger pieces. The tooling structure is lightweight and simple, allowing for rapid assembly and disassembly. Assembly is easy and convenient; simply insert the finger piece gently.

[0113] The spring expansion tooling utilizes a conical expansion cylinder. The appropriate cone angle, combined with the smooth downward pressure of the compression spring bracket, easily expands springs that cannot be done manually. The connection between the expansion cylinder and the positioning cylinder allows for a seamless process of spring expansion and spring insertion into the contact finger assembly, making it simple and practical.

[0114] The spring-loaded contact finger assembly can be freely moved and assembled with the positioning shaft, easily completing its assembly with the contact finger seat and shield. The positioning shaft, acting as an auxiliary tool, is axially pushed during the assembly of the contact finger and contact finger seat, and its inner limiting function of the contact finger assembly is replaced by the contact finger seat. Pulling the positioning shaft out from one side of the shield completes the assembly of the contact finger spring.

[0115] The entire assembly process is simple, practical, lightweight, quick, and easy to operate. It can effectively solve problems such as the difficulty in placing the contact finger pieces, the effort required to open the spring, and the complexity of spring assembly. It is novel, practical, and operable.

[0116] The above embodiments are merely one of the implementation methods for achieving the technical solution of the present invention. The scope of protection claimed by the present invention is not limited to this embodiment, but also includes any variations, substitutions and other implementation methods that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention.

Claims

1. A high-voltage circuit breaker contact finger spring assembly fixture, characterized in that, Includes a finger positioning assembly and a spring expansion assembly that works with it; The finger-shaped positioning assembly includes a base plate (1), on which a limiting sleeve (3) and a positioning shaft (4) are arranged sequentially from the outside to the inside; a cylindrical annular cavity is formed between the limiting sleeve (3) and the positioning shaft (4), and the cylindrical annular cavity is used to arrange the finger-shaped pieces (8) in an array. The spring expansion assembly includes an expansion cylinder (5), and a compression spring bracket (6) is inserted inside the expansion cylinder (5); the compression spring bracket (6) is axially sliding in the expansion cylinder (5); When assembling the high-voltage circuit breaker contact finger spring, the top of the positioning shaft (4) is located in the bottom inner hole of the expansion cylinder (5); The expansion cylinder (5) has a conical structure, and radially arranged non-through grooves (9) are provided on the circumference of the expansion cylinder (5) from the small end to the large end. The compression spring bracket (6) is I-shaped and includes an integrally formed handle (13), a branch tube (14), and a finger plate (10); the finger plate (10) is radial and located at the bottom of the branch tube (14); the finger plate (10) is inserted into the through groove (9) and can slide along the axial direction of the through groove (9); The assembly process for the contact finger springs of the high-voltage circuit breaker is as follows: S1: Assemble the base plate (1), the limiting sleeve (3) and the positioning shaft (4) into a finger positioning assembly, and insert the finger pieces (8) one by one into the cylindrical annular inner cavity; S2: Using the compression spring bracket (6) in conjunction with the expansion tube (5), the two springs are pressed into the spring mounting groove of the contact finger piece (8) in sequence to form an assembly; S3: Insert the contact finger seat (11) into the bottom of the assembly, put the shielding cover on the top of the assembly, and pull the positioning shaft (4) out of the assembly. The high voltage circuit breaker contact finger spring assembly is completed.

2. The high-voltage circuit breaker contact finger spring assembly fixture according to claim 1, characterized in that, The inner wall of the limiting sleeve (3) is provided with a rubber ring assembly groove; a rubber ring (2) is provided in the rubber ring assembly groove, and the rubber ring (2) is used to press the finger piece (8).

3. The high-voltage circuit breaker contact finger spring assembly fixture according to claim 1, characterized in that, The base plate (1) is circular, and multiple sets of step structures are provided on the base plate (1). The limiting sleeve (3) and the positioning shaft (4) are respectively located on the step structures.

4. The high-voltage circuit breaker contact finger spring assembly fixture according to claim 1, characterized in that, The limiting sleeve (3) is cylindrical, and the height of the limiting sleeve (3) exceeds the length center of the finger piece (8).

5. The high-voltage circuit breaker contact finger spring assembly fixture according to claim 1, characterized in that, The positioning shaft (4) is provided with a pull-out structure; The pull-out structure is a boss set in the inner hole of the positioning shaft (4), or a welded handle connected to the positioning shaft (4).

6. A method for assembling high-voltage circuit breaker contact springs, based on the high-voltage circuit breaker contact spring assembly fixture according to any one of claims 1-5, characterized in that, include: S1: Assemble the base plate (1), the limiting sleeve (3) and the positioning shaft (4) into a finger positioning assembly, and insert the finger pieces (8) one by one into the cylindrical annular inner cavity; S2: Using the compression spring bracket (6) in conjunction with the expansion tube (5), the two springs are pressed into the spring mounting groove of the contact finger piece (8) in sequence to form an assembly; S3: Insert the contact finger seat (11) into the bottom of the assembly, put the shielding cover on the top of the assembly, and pull the positioning shaft (4) out of the assembly. The high voltage circuit breaker contact finger spring assembly is completed.

7. The method for assembling contact finger springs of a high-voltage circuit breaker according to claim 6, characterized in that, The specific steps of S2 include: S21: Fit the first spring onto the small end of the expansion tube (5), and press down the spring support (6) so that the first spring slides to the large end of the expansion tube (5); S22: Continue to press down the spring bracket (6) so that the first spring slides into the first spring mounting groove of the finger piece (8) to form a pre-assembled body; S23: Remove the base plate (1) and the limiting sleeve (3), flip the pre-assembled body 180°, repeat S21 and S22, so that the second spring slides into the second spring mounting groove of the contact finger piece (8) to form the assembly.

8. A method for assembling contact finger springs of a high-voltage circuit breaker according to claim 6, characterized in that, In S1, a rubber ring (2) is installed on the inner wall of the limiting sleeve (3), and the finger pieces (8) are inserted one by one into the cylindrical annular inner cavity. The rubber ring (2) is used to press the finger pieces (8) tightly.

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