Positioning tool for combined type on-load tap-changer moving contact support

Abstract

The utility model discloses a positioning tool used for a combined type on-load tap-changer moving contact support, the positioning tool comprises a zero point plate, a daughter board, two zero point suckers and a clamping support, the number of the zero point suckers is two, the two zero point suckers are arranged in the zero point plate, a vacuum suction pipe communicated with the zero point suckers is arranged in the zero point plate, and the daughter board is arranged on the daughter board. A quick-inserting sleeve piece connected with a vacuum suction pipe is arranged on the side face of the zero-point plate, the daughter board is detachably installed on the zero-point plate through a zero-point suction cup, and a clamping support is installed on the top of the daughter board. By the adoption of the positioning tool, a four-axis vertical machining center is used as machining equipment, the improved positioning tool is adopted, a multi-station positioning mode is adopted, production efficiency can be improved, machining cost can be greatly reduced, machined products are good in consistency, use requirements can be met, and the positioning tool is simple in overall structure, low in cost and convenient to use. And the device is convenient to assemble and operate and suitable for popularization and application.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of on-load tap changer in transformer, specifically relates to a kind of positioning tool for composite on-load tap changer movable contact support. BACKGROUND

[0002] In power system, since generation and power consumption cannot keep balance, voltage fluctuation is inevitable, which needs on-load tap changer to regulate voltage, and on-load tap changer applied in transformer is mainly used to tap in the case of no interruption of load current of transformer, and adjust output voltage of transformer by changing turns ratio of transformer. On-load tap changer is divided into two categories of composite type and combination type according to structure, wherein, composite type is to combine tap selector and switching switch together, only on-load tap changer body, and combination type is composed of tap selector and switching switch.

[0003] Composite on-load tap changer movable contact system is mainly composed of contact support and circular contact, and its structure is shown in Figure 1 During operation, contact pressure between movable contact system and another stationary contact must be ensured, so as to ensure stable current flow. This requires high machining precision of movable contact support, and the structure of movable contact support is shown in Figure 2 And Figure 3 Two cylindrical bosses are provided at both ends, and two coaxial through holes are provided, so that the concentricity of two cylindrical bosses and the coaxiality of through hole are required to be high in size precision, and design drawing size requirements are required. At present, the machining process of the movable contact support is as follows: special fixture is used to clamp the movable contact support on ordinary lathe, and the machining process is as follows: the drawing size of both ends includes two cylindrical bosses and a through hole at both ends, and there are six machining positions. Each time a machining position is machined, the operator needs to clamp it again, and a movable contact support needs to be clamped six times. In order to meet the design drawing size, it takes about 20 minutes to process a movable contact support.

[0004] Therefore, the current ordinary lathe is used to process the moving contact support, and the following problems exist: first, the tooling for processing needs to be frequently clamped, and the single piece processing time is long, which affects the efficiency. Second, the processing equipment used is an ordinary lathe, and the processing size is mainly guaranteed by the skill and experience of the workers. Both of them cannot guarantee the precision and stability of the support processing quality. The moving contact support is a key part in the moving contact system of the composite tap changer, and selecting a suitable manufacturing process has obvious practical guiding significance for the quality stability and manufacturing economy of the product. In order to meet the batch processing of the moving contact support, in order to improve the production efficiency, reduce the processing cost, increase the quality stability of the processed products, and provide a positioning tooling different from the existing positioning tooling, it is very necessary. Content of the utility model

[0005] The technical problem to be solved by the utility model is that, in view of the problems in the background art, the existing four-axis vertical machining center is used as a processing equipment, the positioning tooling is configured to clamp and fix the moving contact support, and the clamping and fixing is completed once, so that the processing requirement of the moving contact support is met, the production efficiency is improved, the processing cost is reduced, and the processed products meet the use requirement. Specifically, it is a positioning tooling for a moving contact support of a composite on-load tap changer.

[0006] To solve the above technical problems, the technical scheme adopted by the utility model is as follows: a positioning tooling for a moving contact support of a composite on-load tap changer, the positioning tooling comprises a zero point plate, a sub plate, zero point suction cups and clamping supports, two zero point suction cups are arranged on the zero point plate, vacuum suction pipes communicating with the zero point suction cups are arranged in the zero point plate, quick plug kits connected with the vacuum suction pipes are arranged on the side of the zero point plate, the sub plate is detachably arranged on the zero point plate through the zero point suction cups, three groups of clamping supports are arranged on the top of the sub plate, the positioning tooling is used for fixing the moving contact support to be processed through the clamping supports, and the positioning tooling is detachably arranged on the bridge plate of the workbench of the four-axis vertical machining center through the zero point plate.

[0007] Further, the positioning tooling for a moving contact support of a composite on-load tap changer comprises a first base, a second base, a clamping seat, a pressing plate and a connecting bolt, the first base and the second base are arranged in parallel on the sub plate, the clamping seat is arranged on the first base and the second base, two parallel pressing plates are arranged above the clamping seat, the arrangement direction of the two pressing plates is perpendicular to the arrangement direction of the first base and the second base, the connecting bolt is provided with two, and the two connecting bolts are respectively screwed with the sub plate through the pressing plates, and the connecting end of the connecting bolt connected with the sub plate is located between the first base and the second base.

[0008] Further, the positioning tool for the movable contact support of the composite on-load tap changer has the existing four-axis vertical machining center as the machining equipment, adopts the improved positioning tool and adopts the multi-station positioning mode, can improve the production efficiency, greatly reduce the machining cost, has good consistency of the machined products, can meet the use requirements, has simple overall structure, is convenient to assemble and operate, is suitable for popularization and application.

[0009] Further, the positioning tool for the movable contact support of the composite on-load tap changer has the existing four-axis vertical machining center as the machining equipment, adopts the improved positioning tool and adopts the multi-station positioning mode, can improve the production efficiency, greatly reduce the machining cost, has good consistency of the machined products, can meet the use requirements, has simple overall structure, is convenient to assemble and operate, is suitable for popularization and application.

[0010] The positioning tool for the movable contact support of the composite on-load tap changer utilizes the existing four-axis vertical machining center as a machining equipment, adopts a multi-station positioning mode, clamps and fixes the movable contact support, utilizes a cutter to process a cylindrical boss and an axial through hole at both ends of the movable contact support under the action of the four-axis vertical machining center, and six movable contact supports can be processed through one clamping, compared with an existing processing mode, the time for processing one movable contact support is shortened by at least more than half, the consistency of the processed movable contact supports is good, and therefore the stability of the processing quality is ensured.

[0011] Therefore, the positioning tool has the four-axis vertical machining center as the machining equipment, adopts the improved positioning tool, adopts the multi-station positioning mode, can improve the production efficiency, greatly reduce the machining cost, has good consistency of the machined products, can meet the use requirements, has simple overall structure, is convenient to assemble and operate, and is suitable for popularization and application. BRIEF DESCRIPTION OF DRAWINGS

[0012] The utility model will be further explained in detail in connection with the drawings.

[0013] Figure 1 It is the structural schematic diagram of the existing movable contact system;

[0014] Figure 2 It is the three-dimensional structure schematic diagram of the movable contact support to be processed;

[0015] Figure 3 It is Figure 2 A-A section structure schematic diagram in the;

[0016] Figure 4 It is the three-dimensional structure schematic diagram of the positioning tool in the utility model;

[0017] Figure 5 It is the front view of the positioning tool in the utility model;

[0018] Figure 6is a top view of the positioning tool in the utility model;

[0019] Figure 7 is a side view of the positioning tool in the utility model.

[0020] As shown in the figure: 1 - zero point board, 11 - hook part, 12 - connecting part, 2 - sub plate, 3 - zero point suction cup, 4 - clamping support, 41 - first base, 42 - second base, 43 - clamping seat, 44 - pressing plate, 45 - connecting bolt, 5 - quick insertion kit, 6 - handle. DETAILED DESCRIPTION

[0021] The following specific embodiments illustrate the embodiments of the utility model, and those skilled in the art can easily understand other advantages and effects of the utility model from the disclosed content of the specification.

[0022] It should be understood that the structure, proportion, size and the like shown in the drawings of the specification are only used to cooperate with the disclosed content of the specification for understanding and reading by those skilled in the art, and are not used to limit the limiting conditions of the utility model that can be implemented, so they do not have technical substantive significance, any modification of structure, change of proportion relationship or adjustment of size, without affecting the effects and purposes that can be produced by the utility model, should still fall within the scope covered by the disclosed technical content of the utility model. At the same time, the terms such as "upper", "lower", "left", "right" and the like in the specification are only for clear description, and are not used to limit the scope of the utility model that can be implemented, and the change or adjustment of the relative relationship is also considered as the scope of the utility model that can be implemented without substantially changing the technical content.

[0023] In the description of the utility model, it should be pointed out that, unless otherwise explicitly specified and limited, the terms "connection", "provided with" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0024] It should be noted that the term "comprising" or any other variant is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Example 1

[0025] As Figures 4 to 7As shown, the embodiment provides a positioning tool for the movable contact support of a composite on-load tap changer, which adopts a multi-station quick-change zero-point positioning tool, and the positioning tool comprises a zero-point plate 1, a sub-plate 2, two zero-point suction cups 3 and clamping supports 4. The two zero-point suction cups 3 are installed in the zero-point plate 1, and a vacuum suction pipe communicating with the zero-point suction cups 3 is installed in the zero-point plate 1. A quick-insert kit 5 is arranged on the side of the zero-point plate 1 and connected with the vacuum suction pipe. The sub-plate 2 is detachably installed on the zero-point plate 1 through the zero-point suction cups 3. Three groups of clamping supports 4 are arranged in parallel on the top of the sub-plate 2. The positioning tool is used for fixing the movable contact support to be processed through the clamping supports 4, and is detachably installed on the bridge plate of the workbench of a four-axis vertical machining center through the zero-point plate 1.

[0026] The clamping support 4 comprises a first base 41, a second base 42, a clamping seat 43, a pressing plate 44 and a connecting bolt 45. The first base 41 and the second base 42 are arranged in parallel on the sub-plate 2. The clamping seat 43 is arranged on the first base 41 and the second base 42. Two pressing plates 44 are arranged above the clamping seat 43 in parallel. The arrangement direction of the two pressing plates 44 is perpendicular to the arrangement direction of the first base 41 and the second base 42. The connecting bolt 45 is provided with two connecting bolts 45, which are respectively screwed with the sub-plate 2 through the pressing plates 44. The connecting end of the connecting bolt 45 connected with the sub-plate 2 is located between the first base 41 and the second base 42.

[0027] Further, the positioning tool provided by the embodiment is provided with handles 6 at both ends of the sub-plate 2, which are arranged in the sub-plate 2 in a symmetrical state. The handles 6 arranged at both ends of the sub-plate 2 facilitate the operation of the sub-plate 2 arranged on the zero-point plate 1, and the sub-plate 2 can be replaced in time. The quick-insert kit 5 is connected with the external air source to provide air source for the zero-point suction cups 3. The zero-point suction cups 3 can adsorb the sub-plate 2. After processing, the air in the zero-point suction cups 3 is released, so that the zero-point suction cups 3 have no adsorption force. In this way, the processed workpiece and the sub-plate 2 can be taken down, and then the workpiece is clamped again for replacement, so that the next batch of products can be repeatedly processed without replacing the zero-point plate 1. Embodiment 2

[0028] The embodiment provides a processing method for the movable contact support of a composite on-load tap changer by using the above positioning tool. The processing method is used for fixing the movable contact support by using the above positioning tool, and then a four-axis vertical machining center is used as a processing equipment to process the cylindrical boss and the axial through hole in the movable contact support. The specific processing method comprises the following steps:

[0029] S1. The moving contact support to be processed is clamped with a positioning tool, and then the clamped positioning tool is installed on the bridge plate on the existing four-axis vertical machining center workbench;

[0030] S2. A boring blade is used as a special tool for machining the cylindrical bosses at both ends of the moving contact support, and a milling cutter corresponding to the axial through hole of the contact support is selected as a machining tool. First, the boring blade is installed on the first spindle of the four-axis vertical machining center, and then the milling cutter is installed on the second spindle of the four-axis vertical machining center;

[0031] S3. After the tool installation is completed, the four-axis vertical machining center is started. The boring blade installed on the first spindle is used to first machine the cylindrical boss at one end of the moving contact support, and then the bridge plate on the workbench is rotated. The boring blade installed on the first spindle is used to machine the cylindrical boss at the other end of the moving contact support, so that the roundness tolerance of the cylindrical bosses at both ends is consistent, and the machining precision meets the requirements;

[0032] S4. After the cylindrical bosses at both ends of the moving contact support are machined, the milling cutter installed on the second spindle is used to first machine the axial through hole on the moving contact support, and then the bridge plate on the workbench is rotated. The milling cutter installed on the second spindle is used to machine the axial through hole at the other end of the moving contact support, so that the axial through holes at both ends meet the coaxiality and precision requirements, i.e. the product machining of the moving contact support is completed.

[0033] Further, in the clamping and positioning stage of step S1, six moving contact supports to be processed are installed in the positioning tool; in the machining tool stage of step S2, a boring blade is installed on the tool holder of the first spindle, and a milling cutter is installed on the tool holder of the second spindle; and in the cylindrical boss machining stage of step S3, for the two cylindrical bosses at the same end of the moving contact support, the boring blade is used to first sequentially machine the six cylindrical bosses in the same horizontal plane, and then sequentially machine the other six cylindrical bosses at the same end. After machining is completed, the bridge plate on the workbench is rotated, and the corresponding cylindrical bosses are machined at the other end of the moving contact support by the same machining method; in the axial through hole machining stage of step S4, the milling cutter is used to sequentially machine the axial through hole machining.

[0034] In the specific implementation process, for the machining process of the cylindrical bosses and the axial through holes at both ends of the moving contact support, the existing four-axis vertical machining center machining program is operated and controlled, as long as the six machining positions of the product meet the design drawing requirements.

[0035] The machining method described in this embodiment is improved mainly in the following two aspects:

[0036] 1. The machining equipment was upgraded to a four-axis vertical machining center, utilizing the stability of the CNC equipment to ensure the stability of the bracket machining quality. While the existing vertical machining center uses straight shank end mills, these cannot guarantee roundness. Therefore, boring inserts were used as dedicated tools for machining the cylindrical bosses at both ends, thus ensuring the roundness tolerance of the boss shape. For the drilling end mills, those matching the axial through holes were selected.

[0037] 2. Based on the shape of the parts and the processing requirements, the machining fixture is designed as a multi-station quick-change zero-point positioning fixture, which can clamp six workpieces at a time. After clamping, it is installed on the bridge plate of the four-axis machining center, and processing can begin.

[0038] The improved processing method significantly reduces clamping time and processing efficiency compared to the existing method. The comparison before and after implementation is shown in the table below:

[0039] Comparison of processing efficiency

[0040]

[0041] The comparison shows that, based on actual calculations, the improved processing method not only increases processing efficiency by at least 100%, but also ensures the consistency of the processed products, thereby guaranteeing the stability of processing quality.

[0042] Therefore, the processing method described in this embodiment utilizes an existing four-axis vertical machining center as the processing equipment. By configuring a multi-station quick-change zero-point positioning fixture, the moving contact bracket is fixed. Under the action of the four-axis vertical machining center, cylindrical bosses and axial through holes are machined at both ends of the moving contact bracket using cutting tools. Six moving contact brackets can be processed in one clamping operation. Compared with the existing processing method, the processing time for one moving contact bracket is reduced by at least half, and the processed moving contact brackets have good consistency, thus ensuring the stability of processing quality.

[0043] In summary, the positioning fixture described in this utility model, using a four-axis vertical machining center as the processing equipment, and employing an improved positioning fixture with a multi-station positioning method, can not only improve production efficiency but also greatly reduce processing costs. The processed products have good consistency and can meet usage requirements. Its overall structure is simple, easy to assemble and operate, and suitable for widespread application.

[0044] Other aspects of this utility model that are not detailed herein are all conventional techniques known to those skilled in the art.

[0045] The protection scope of the utility model is not limited to the technical scheme disclosed by the specific embodiment, the above is only the preferable embodiment of the utility model, and does not limit the utility model, and any slight modification, equivalent replacement and improvement according to the technical scheme of the utility model should be contained in the protection scope of the technical scheme of the utility model.

Claims

1. A positioning tool for a composite on-load tap changer moving contact support, characterized by: The positioning tool includes a zero plate (1), a sub-plate (2), two zero suction cups (3) and clamping supports (4), the two zero suction cups (3) are installed in the zero plate (1), vacuum suction pipes communicating with the zero suction cups (3) are installed in the zero plate (1), quick plug kits (5) connected with the vacuum suction pipes are arranged on the side of the zero plate (1), and the sub-plate (2) is detachably installed on the zero plate (1) through the zero suction cups (3), a plurality of groups of clamping supports (4) are arranged on the top of the sub-plate (2).

2. The positioning tool for the composite on-load tap changer moving contact support according to claim 1, characterized in that: The clamping support (4) includes a first base (41), a second base (42), a clamping seat (43), a pressing plate (44) and a connecting bolt (45), the first base (41) and the second base (42) are arranged in parallel on the sub-plate (2), the clamping seat (43) is arranged on the first base (41) and the second base (42), two parallel pressing plates (44) are arranged above the clamping seat (43), the arrangement direction of the two pressing plates (44) is perpendicular to the arrangement direction of the first base (41) and the second base (42), and the two connecting bolts (45) are respectively screwed with the sub-plate (2) through the pressing plates (44), and the connecting end of the connecting bolt (45) and the sub-plate (2) is located between the first base (41) and the second base (42).

3. The positioning tool for the composite on-load tap changer moving contact support according to claim 2, characterized in that: The clamping support (4) is provided with three groups, and the three groups of clamping supports (4) are arranged in parallel on the top of the sub-plate (2); the positioning tool is used for fixing the moving contact support to be processed through the clamping support (4), and the zero plate (1) is detachably installed on the bridge plate of the four-axis vertical machining center workbench.

4. The positioning tool for the composite on-load tap changer moving contact support according to claim 3, characterized in that: Handles (6) are further arranged at both ends of the sub-plate (2), and the two handles (6) are arranged in the sub-plate (2) in a symmetrical state.

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