Processing method of combined type on-load tap-changer moving contact support

Abstract

The invention discloses a processing method of a combined type on-load tap-changer moving contact support, which comprises the following steps of: clamping and positioning the moving contact support to be processed by adopting a positioning tool, selecting a cutter to be arranged on a main shaft of a four-axis vertical processing center, starting the four-axis vertical processing center, and processing the moving contact support to be processed by adopting a positioning tool. And the moving contact support is machined according to the design requirement through the cutter installed on the main shaft, and then product machining of the moving contact support is completed. According to the machining method, the positioning tool is arranged, the four-axis vertical machining center serves as machining equipment, the improved machining method is adopted, the production efficiency can be improved, the machining cost can be greatly reduced, machined products are good in consistency, and the use requirement can be met.

Description

Technical Field

[0001] The invention relates to the technical field of on-load tap changers in transformers, and in particular to a method for processing a composite on-load tap changer moving contact bracket. Background Art

[0002] In the power system, since it is impossible to keep a balance between power generation and power consumption, voltage fluctuation is inevitable, which requires on-load tap changers to adjust the voltage. The on-load tap changers used in transformers are mainly used to perform tapping without interrupting the load current of the transformer, and to adjust the output voltage of the transformer by changing the turns ratio of the transformer. On-load tap changers are divided into two categories according to their structure: composite type and combined type. The composite type combines the tap selector and the transfer switch together, with only the tap switch body, while the combined type is composed of the tap selector and the transfer switch.

[0003] The moving contact system of the composite on-load tap changer is mainly composed of a contact support and a circular contact. Figure 1 As shown. During the operation of the contact system, the contact pressure between the moving contact and the other static contact must be guaranteed to ensure the stable flow of current. This places high demands on the processing accuracy of the moving contact bracket. The structure of the moving contact bracket is as follows: Figure 2 and Figure 3 As shown, there are not only two cylindrical bosses at both ends, but also two coaxially arranged through holes. Therefore, the concentricity of the cylindrical bosses at both ends and the coaxiality of the through holes are very demanding, and both need to meet the size requirements of the design drawings. The current process method used for processing this moving contact bracket is: on an ordinary lathe, a special fixture is used to clamp the moving contact bracket. During the processing, the drawing dimensions of the two ends, including the two cylindrical bosses and a through hole at both ends, have a total of six processing positions. For each processing position, the operator needs to re-clamp once. After processing a moving contact bracket, it needs to be clamped six times. In order to meet the design drawing dimensions, it takes an average of about 20 minutes to process a moving contact bracket.

[0004] It can be seen that the following problems exist in the current ordinary lathes used to process the moving contact bracket: First, the tooling used for processing needs to be clamped frequently, and the processing time of a single piece is long, which affects efficiency. Second, the processing equipment used is an ordinary lathe, and its processing size is mainly guaranteed by manual skills and experience. Neither of these can guarantee the accuracy and stability of the bracket processing quality. As a key part in the moving contact system of the composite tap changer, the moving contact bracket has obvious practical guiding significance for the quality stability and manufacturing economy of the product by selecting a suitable manufacturing process. In order to meet the batch processing of the moving contact bracket, so as to improve production efficiency, reduce processing costs, and increase the quality stability of the processed products, it is very necessary to provide a processing method different from the existing one. Summary of the invention

[0005] The technical problem to be solved by the present invention is to address the problems existing in the background technology. The existing four-axis vertical machining center is used as processing equipment, and the moving contact bracket is clamped and fixed by the configured positioning tooling. The processing requirements of the moving contact bracket can be met by clamping and fixing once, which can not only improve production efficiency, but also reduce processing costs, and make the processed products meet the use requirements. Specifically, it is a processing method for the moving contact bracket of a composite on-load tap changer.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a processing method for a composite on-load tap changer moving contact support, the processing method comprising the following steps: S1. The moving contact bracket to be processed is clamped by a positioning fixture, and then the clamped positioning fixture is installed on the bridge plate on the workbench of the existing four-axis vertical machining center; S2. Use a boring blade as a special tool for machining the cylindrical bosses at both ends of the moving contact bracket, and select a milling cutter corresponding to the axial through hole of the contact bracket as a machining tool. First, install the boring blade on the first spindle of the four-axis vertical machining center, and then install the milling cutter on the second spindle of the four-axis vertical machining center; S3. After the tool is installed, start the four-axis vertical machining center, use the boring blade installed on the first spindle to first process the cylindrical boss at one end of the moving contact bracket, then rotate the bridge plate on the workbench, and then use the boring blade installed on the first spindle to process the cylindrical boss at the other end of the moving contact bracket, ensuring that the roundness tolerance of the cylindrical boss shapes at both ends is consistent and the machining accuracy meets the requirements; S4. After the cylindrical bosses at both ends of the moving contact bracket are processed, use the milling cutter installed on the second spindle to first process the axial through hole on the moving contact bracket, then rotate the bridge plate on the workbench, and then use the milling cutter installed on the second spindle to process the axial through hole at the other end of the moving contact bracket to ensure that the axial through holes at both ends meet the coaxial and precision requirements, and the product processing of the moving contact bracket is completed.

[0007] Furthermore, a processing method for a composite on-load tap changer moving contact bracket described in the present invention is adopted. In the clamping and positioning stage in step S1, six moving contact brackets to be processed are installed in the positioning tooling; in the tool processing stage in step S2, a boring blade is installed on the cutter disc of the first spindle, and a milling cutter is installed on the cutter disc of the second spindle; and in the cylindrical boss processing stage in step S3, for the two cylindrical bosses at the same end of the moving contact bracket, the boring blade is used to first sequentially process the six cylindrical bosses in the same horizontal plane, and then the other six cylindrical bosses at the same end are sequentially processed. After the processing is completed, the bridge plate on the workbench is rotated, and the corresponding cylindrical boss is processed at the other end of the moving contact bracket according to the same processing method; in the axial through hole processing stage in step S4, the axial through hole processing is completed in sequence using a milling cutter.

[0008] Furthermore, a processing method for a composite on-load tap changer moving contact bracket described in the present invention is adopted, and the positioning tool adopts a multi-station quick-change zero-point positioning tool, and the multi-station quick-change zero-point positioning tool includes a zero-point plate, a sub-plate, a zero-point suction cup and a clamping support. Two zero-point suction cups are provided, and the two zero-point suction cups are installed in the zero-point plate. A vacuum suction pipe connected to the zero-point suction cup is installed in the zero-point plate, and a quick-insert kit connected to the vacuum suction pipe is provided on the side of the zero-point plate. The sub-plate is detachably mounted on the zero-point plate through the zero-point suction cup, and three groups of parallelly arranged clamping supports are installed on the top of the sub-plate. The positioning tool is used to fix the moving contact bracket to be processed through the clamping support, and is detachably mounted on the bridge plate on the workbench of the four-axis vertical machining center through the zero-point plate.

[0009] Furthermore, a processing method for a composite on-load tap changer moving contact support described in the present invention is adopted, the clamping support includes a first base, a second base, a clamping seat, a pressure plate and connecting bolts, 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, and two parallel pressure plates are arranged above the clamping seat, and the arrangement direction of the two pressure plates is perpendicular to the arrangement direction of the first base and the second base. There are two connecting bolts, the two connecting bolts pass through the pressure plate and are screwed to the sub-plate respectively, and the connecting end of the connecting bolt and the sub-plate is located between the first base and the second base.

[0010] Furthermore, the processing method of the composite on-load tap changer moving contact support of the present invention is adopted, and handles are provided at both ends of the sub-plate, and the two handles are symmetrically arranged in the sub-plate.

[0011] Compared with the prior art, the method for processing a composite on-load tap changer moving contact bracket of the present invention has the following beneficial effects: the existing four-axis vertical machining center is used as the machining equipment, and the moving contact bracket is fixed by means of the configured multi-station quick-change zero-point positioning tooling; under the action of the four-axis vertical machining center, a tool is used to machine cylindrical bosses and axial through holes at both ends of the moving contact bracket; six moving contact brackets can be machined through one clamping; compared with the prior art, the time for machining one moving contact bracket is shortened by at least half, and the machined moving contact bracket has good consistency, thereby ensuring the stability of the machining quality.

[0012] It can be seen that by adopting the processing method described in the present invention, through the configuration of positioning tooling, using a four-axis vertical machining center as processing equipment, and adopting the improved processing method, not only can the production efficiency be improved, but also the processing cost can be greatly reduced. The processed products have good consistency and can meet the use requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0014] Figure 1 It is a structural schematic diagram of an existing moving contact system; Figure 2 It is a three-dimensional structural schematic diagram of the moving contact bracket to be processed; Figure 3 yes Figure 2 Schematic diagram of the AA section structure; Figure 4 It is a three-dimensional structural schematic diagram of the positioning tooling described in the present invention; Figure 5 It is a front view of the positioning tool described in the present invention; Figure 6 is a top view of the positioning tool described in the present invention; Figure 7 It is a side view of the positioning tool described in the present invention.

[0015] As shown in the figure: 1-zero point plate, 11-hook part, 12-connecting part, 2-sub-plate, 3-zero point suction cup, 4-clamping support, 41-first base, 42-second base, 43-card holder, 44-pressing plate, 45-connecting bolt, 5-quick plug kit, 6-handle. DETAILED DESCRIPTION

[0016] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0017] It should be noted that the structures, proportions, sizes, etc. drawn in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical content disclosed by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", etc. quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0018] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "provided with" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] It should be noted that the term "comprise" or any other variation is intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus. Example 1

[0020] like Figures 4 to 7 As shown, this embodiment provides a positioning tool, which adopts a multi-station quick-change zero-point positioning tool, and the multi-station quick-change zero-point positioning tool includes a zero-point plate 1, a sub-plate 2, a zero-point suction cup 3 and a clamping support 4. The zero-point suction cup 3 is provided with two, and the two zero-point suction cups 3 are installed in the zero-point plate 1. A vacuum suction pipe connected to the zero-point suction cup 3 is installed in the zero-point plate 1, and a quick-insert kit 5 connected to the vacuum suction pipe is provided on the side of the zero-point plate 1. The sub-plate 2 is detachably mounted on the zero-point plate 1 through the zero-point suction cup 3, and three groups of parallelly arranged clamping supports 4 are installed on the top of the sub-plate 1. The positioning tool is used to fix the moving contact bracket to be processed through the clamping support 4, and is detachably mounted on the bridge plate on the workbench of the four-axis vertical machining center through the zero-point plate 1.

[0021] Among them, the clamping support 4 includes a first base 41, a second base 42, a clamping seat 43, a pressure 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 pressure plates 44 are arranged above the clamping seat 43. The arrangement direction of the two pressure plates 44 is perpendicular to the arrangement direction of the first base 41 and the second base 42. There are two connecting bolts 45. The two connecting bolts 45 pass through the pressure plates 44 and are screwed to the sub-plate 2 respectively. 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.

[0022] Furthermore, the positioning tool provided in the present embodiment is adopted, and handles 6 are further provided at both ends of the sub-board 2, and the two handles 6 are symmetrically arranged in the sub-board 2. By means of the handles 6 provided at both ends of the sub-board 2, it is convenient to operate the sub-board 2 provided on the zero-point board 1, and the sub-board 2 can be replaced in time. By connecting the quick-insert kit 5 with an external air source, an air source can be provided to the zero-point suction cup 3, and the sub-board 2 can be adsorbed by the zero-point suction cup 3. After the processing is completed, the gas in the zero-point suction cup 3 is released so that the zero-point suction cup 3 has no adsorption force, so that the processed workpiece and the sub-board 2 can be removed, and then replaced with the re-clamped workpiece, and the next batch of products can be repeatedly processed without replacing the zero-point board 1. Example 2

[0023] This embodiment provides a method for processing a moving contact bracket of a composite on-load tap changer. The processing method uses the above-mentioned positioning tooling to fix the moving contact bracket, and then uses a four-axis vertical machining center as a processing device to realize the processing of the cylindrical boss and the axial through hole in the moving contact bracket. The specific processing method includes the following steps: S1. The moving contact bracket to be processed is clamped by a positioning fixture, and then the clamped positioning fixture is installed on the bridge plate on the workbench of the existing four-axis vertical machining center; S2. Use a boring blade as a special tool for machining the cylindrical bosses at both ends of the moving contact bracket, and select a milling cutter corresponding to the axial through hole of the contact bracket as a machining tool. First, install the boring blade on the first spindle of the four-axis vertical machining center, and then install the milling cutter on the second spindle of the four-axis vertical machining center; S3. After the tool is installed, start the four-axis vertical machining center, use the boring blade installed on the first spindle to first process the cylindrical boss at one end of the moving contact bracket, then rotate the bridge plate on the workbench, and then use the boring blade installed on the first spindle to process the cylindrical boss at the other end of the moving contact bracket, ensuring that the roundness tolerance of the cylindrical boss shapes at both ends is consistent and the machining accuracy meets the requirements; S4. After the cylindrical bosses at both ends of the moving contact bracket are processed, use the milling cutter installed on the second spindle to first process the axial through hole on the moving contact bracket, then rotate the bridge plate on the workbench, and then use the milling cutter installed on the second spindle to process the axial through hole at the other end of the moving contact bracket to ensure that the axial through holes at both ends meet the coaxial and precision requirements, and the product processing of the moving contact bracket is completed.

[0024] Furthermore, the processing method described in this embodiment is adopted. In the clamping and positioning stage of step S1, six moving contact brackets to be processed are installed in the positioning tooling; in the tool processing stage of step S2, a boring blade is installed on the cutter disc of the first spindle, and a milling cutter is installed on the cutter disc of the second spindle; and in the cylindrical boss processing stage of step S3, for the two cylindrical bosses at the same end of the moving contact bracket, the boring blade is used to first sequentially process the six cylindrical bosses in the same horizontal plane, and then the other six cylindrical bosses at the same end are sequentially processed. After the processing is completed, the bridge plate on the workbench is rotated, and the corresponding cylindrical boss is processed at the other end of the moving contact bracket according to the same processing method; in the axial through hole processing stage of step S4, the milling cutter is used to sequentially complete the axial through hole processing.

[0025] In the specific implementation process, the processing of the cylindrical bosses and axial through holes at both ends of the moving contact bracket is controlled according to the processing procedures of the existing four-axis vertical machining center, as long as the six processing positions of the product meet the requirements of the design drawings.

[0026] The processing method of the composite on-load tap changer moving contact support of the present invention is improved mainly in the following two aspects: 1. The processing equipment is improved to a four-axis vertical machining center, and the stability of the CNC equipment is used to ensure the stability of the bracket processing quality. Since the existing vertical machining center is equipped with a straight shank milling cutter, the existing straight shank milling cutter cannot guarantee the roundness. Boring blades are used as special tools for processing the cylindrical bosses at both ends to ensure the roundness tolerance of the boss shape. For the milling cutter used for drilling, a milling cutter that matches the axial through hole can be selected.

[0027] 2. According to the shape of the parts and processing requirements, the processing tooling is designed as a multi-station quick-change zero-point positioning tooling, 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.

[0028] Compared with the existing processing method, the improved processing method greatly saves clamping time and processing efficiency. The specific comparison before and after implementation is shown in the following table: Comparison of processing efficiency

[0029] By comparison, it can be seen that the use of the improved processing method, after actual measurement, not only the processing efficiency is improved by at least 1 times, but also the consistency of the processed products is guaranteed, thus ensuring the stability of the processing quality.

[0030] It can be seen that by adopting the processing method described in the present invention, using the existing four-axis vertical machining center as the processing equipment, the moving contact bracket is fixed by the configured multi-station quick-change zero-point positioning tooling, and under the action of the four-axis vertical machining center, the cylindrical boss and the axial through hole are processed at both ends of the moving contact bracket by the tool. Through one clamping, six moving contact brackets can be processed. Compared with the existing processing method, the time for processing a moving contact bracket is shortened by at least half, and the processed moving contact bracket has good consistency, thereby ensuring the stability of the processing quality.

[0031] To sum up, by adopting the processing method described in the present invention, through the configuration of positioning tooling, using a four-axis vertical machining center as processing equipment, and adopting the improved processing method, not only can the production efficiency be improved, but also the processing cost can be greatly reduced. The processed products have good consistency and can meet the use requirements.

[0032] Other aspects of the present invention that are not described in detail are all conventional techniques known to those skilled in the art.

[0033] The protection scope of the present invention is not limited to the technical solutions disclosed in the specific implementation methods. The above description is only a preferred implementation method of the present invention and does not limit the present invention. Any minor modifications, equivalent substitutions and improvements made according to the technical solutions of the present invention should be included in the protection scope of the technical solutions of the present invention.

Claims

1. A method for processing a composite on-load tap changer moving contact support, characterized in that: The processing method comprises the following steps: S1. The moving contact bracket to be processed is clamped by a positioning fixture, and then the clamped positioning fixture is installed on the bridge plate on the workbench of the existing four-axis vertical machining center; S2. Use a boring blade as a special tool for machining the cylindrical bosses at both ends of the moving contact bracket, and select a milling cutter corresponding to the axial through hole of the contact bracket as a machining tool. First, install the boring blade on the first spindle of the four-axis vertical machining center, and then install the milling cutter on the second spindle of the four-axis vertical machining center; S3. After the tool is installed, start the four-axis vertical machining center, use the boring blade installed on the first spindle to first process the cylindrical boss at one end of the moving contact bracket, then rotate the bridge plate on the workbench, and then use the boring blade installed on the first spindle to process the cylindrical boss at the other end of the moving contact bracket, ensuring that the roundness tolerance of the cylindrical boss shapes at both ends is consistent and the machining accuracy meets the requirements; S4. After the cylindrical bosses at both ends of the moving contact bracket are processed, use the milling cutter installed on the second spindle to first process the axial through hole on the moving contact bracket, then rotate the bridge plate on the workbench, and then use the milling cutter installed on the second spindle to process the axial through hole at the other end of the moving contact bracket to ensure that the axial through holes at both ends meet the coaxial and precision requirements, and the product processing of the moving contact bracket is completed.

2. The method for processing a composite on-load tap changer moving contact support according to claim 1, characterized in that: In the clamping and positioning stage of step S1, six moving contact brackets to be processed are installed in the positioning tool; in the tool processing stage of step S2, a boring blade is installed on the cutter disc of the first spindle, and a milling cutter is installed on the cutter disc of the second spindle; and in the cylindrical boss processing stage of step S3, for the two cylindrical bosses at the same end of the moving contact bracket, the boring blade is used to first sequentially process the six cylindrical bosses in the same horizontal plane, and then the other six cylindrical bosses at the same end are sequentially processed. After the processing is completed, the bridge plate on the workbench is rotated, and the corresponding cylindrical boss is processed at the other end of the moving contact bracket according to the same processing method; in the axial through hole processing stage of step S4, the milling cutter is used to sequentially complete the axial through hole processing.

3. The method for processing a composite on-load tap changer moving contact support according to claim 2, characterized in that: The positioning tool adopts a multi-station quick-change zero-point positioning tool, and the multi-station quick-change zero-point positioning tool includes a zero-point plate (1), a sub-plate (2), a zero-point suction cup (3) and a clamping support (4). The zero-point suction cup (3) is provided with two, and the two zero-point suction cups (3) are installed in the zero-point plate (1). A vacuum suction pipe connected to the zero-point suction cup (3) is installed in the zero-point plate (1), and a quick-insert kit (5) connected to the vacuum suction pipe is provided on the side of the zero-point plate (1). The sub-plate (2) is detachably mounted on the zero-point plate (1) through the zero-point suction cup (3), and three groups of parallelly arranged clamping supports (4) are installed on the top of the sub-plate (1). The positioning tool is used to fix the moving contact bracket to be processed through the clamping support (4), and is detachably mounted on the bridge plate on the workbench of the four-axis vertical machining center through the zero-point plate (1).

4. The method for processing a composite on-load tap changer moving contact support according to claim 3, characterized in that: The clamping support (4) includes a first base (41), a second base (42), a clamping seat (43), a pressure plate (44) and a connecting bolt (45); the first base (41) and the second base (42) are arranged on the sub-plate (2) in a parallel state; the clamping seat (43) is arranged on the first base (41) and the second base (42); two parallel pressure plates (44) are arranged above the clamping seat (43); the arrangement direction of the two pressure plates (44) is perpendicular to the arrangement direction of the first base (41) and the second base (42); two connecting bolts (45) are provided; the two connecting bolts (45) respectively pass through the pressure plates (44) and are screwed to the sub-plate (2); 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).

5. The method for processing a composite on-load tap changer moving contact support according to claim 4, characterized in that: Handles (6) are also provided at both ends of the sub-board (2), and the two handles (6) are symmetrically arranged in the sub-board (2).

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