A converter station bus duct punching reference positioning device

Abstract

The utility model provides a kind of commutation station pipe bus punching reference positioning device, belong to electric power device technical field, including rectangular base plate. Positioning block component and scale slider component, the upper surface of the rectangular base plate is provided with longitudinal guide rail groove, the positioning block component includes two L-shaped positioning blocks, each L-shaped positioning block is connected by vertical positioning surface and horizontal support surface and is formed, the inner side of vertical positioning surface is provided with circular arc positioning recess, two L-shaped positioning blocks are fixed to the both side edge positions of the rectangular base plate, the arc surface of the circular arc positioning recess is used to adhere to the outer circumferential surface of pipe bus, the scale slider component includes main scale and vernier slider, the main scale is fixedly installed in the longitudinal guide rail groove, solve the technical problem of not enough accurate in the pipe bus punching operation process of existing.

Description

Technical Field

[0001] This utility model belongs to the field of power equipment technology, and specifically relates to a reference positioning device for drilling holes in the busbar of a converter station. Background Technology

[0002] During the construction, operation, and maintenance of converter stations, busbars, as key conductor components for power transmission, require precise drilling for the installation of connectors, supports, or fixing bolts. The positional accuracy of these holes directly affects the assembly quality and electrical performance of the busbar system. Currently, busbar drilling in converter station projects mainly relies on traditional measurement and positioning methods. Operators typically use steel tape measures or vernier calipers to measure the length on the surface of the busbar and then mark the drilling positions with a scribe or marker. This method has several limitations. First, the contact between the measuring tool and the cylindrical busbar surface is unstable, easily leading to reading errors. Second, manual marking is inconsistent due to the operator's skill level and eyesight. Third, the lack of reliable fixed support during measurement makes the busbar prone to rolling or displacement, causing changes in the measurement reference point. Furthermore, when drilling at the same location on multiple busbars is required, the workload of repeated measurement and marking is large, and it is difficult to ensure the accuracy of each busbar. To ensure precise and consistent drilling positions, some construction units have attempted to use simple wooden or metal supports with squares for auxiliary positioning. However, these homemade tools lack precise scale systems and adjustable positioning mechanisms, and can only achieve rough position control, failing to meet the increasingly stringent installation accuracy requirements of converter station busbar systems. With the expansion of converter station construction scale and the increase in voltage levels, the precision requirements for busbar processing are becoming increasingly stringent. Drilling position deviations exceeding the allowable range will lead to difficulties in installing connectors, uneven stress, or even affect the reliability of electrical connections. Therefore, the existing simple measuring tools and manual marking positioning methods are no longer adequate for the actual needs of high-precision busbar processing. There is an urgent need to develop a reference positioning device specifically for busbar drilling operations. This device should provide stable busbar support and fixing functions, precise drilling position measurement and calibration functions, and intuitive visual guidance functions, thereby fundamentally improving the accuracy and consistency of busbar drilling positioning. Utility Model Content

[0003] In view of this, the present invention provides a reference positioning device for drilling holes in converter station busbars, which can solve the technical problem of inaccuracy that is common in existing busbar drilling operations.

[0004] This utility model is implemented as follows: This utility model provides a reference positioning device for drilling holes in the busbars of a converter station. The reference positioning device for drilling holes in the busbars of a converter station includes a rectangular base plate, a positioning block assembly, and a scale slider assembly. The upper surface of the rectangular base plate is provided with a longitudinal guide rail groove. The positioning block assembly includes two L-shaped positioning blocks that are respectively erected on the surface of the rectangular base plate on both sides of the longitudinal guide rail groove. Each L-shaped positioning block is composed of a vertical positioning surface and a horizontal support surface connected together. The inner side of each vertical positioning surface is provided with an arc-shaped positioning groove for placing the busbar. The two L-shaped positioning blocks are symmetrically fixed to the two side edges of the rectangular base plate through their respective horizontal support surfaces. The arc surface of the arc-shaped positioning groove is used to fit the outer circumferential surface of the busbar. The scale slider assembly includes a main scale and a vernier slider. The main scale is fixedly installed in the longitudinal guide rail groove, and the vernier slider can slide along the longitudinal guide rail groove. This device combines an L-shaped positioning block assembly with an arc-shaped positioning groove with a scale slider assembly that can slide along the longitudinal guide groove. This allows the busbar to be stably fitted within the arc-shaped positioning groove. At the same time, the cross-shaped reference line projected by the laser pointer onto the surface of the busbar provides clear visual guidance for the drilling position, achieving precise positioning of the busbar during the drilling process. This solves the problems of busbar position offset and difficulty in accurately determining the reference point under traditional positioning methods, significantly improving the positioning accuracy and ease of operation of the drilling operation, and laying a reliable foundation for subsequent precision machining operations.

[0005] The radius of the arc-shaped positioning groove ranges from 25mm to 60mm, and the central angle corresponding to the arc length of the arc-shaped positioning groove ranges from 80 degrees to 120 degrees. By limiting the radius of the arc-shaped positioning groove to 25mm to 60mm and the central angle corresponding to the arc length to 80 degrees to 120 degrees, the positioning groove can adapt to the outer diameter of various specifications of busbars commonly used in converter stations. At the same time, the reasonable range of the central angle ensures sufficient contact arc length between the busbar and the positioning groove, providing a stable three-point or multi-point support contact state, effectively preventing rotation or lateral displacement of the busbar during positioning, and enhancing the stability and reliability of positioning.

[0006] The angle between the vertical positioning surface and the horizontal support surface is between 85 and 95 degrees. The lower surface of the horizontal support surface is connected to the rectangular base plate by bolts. The bolts pass through bolt holes in the horizontal support surface and engage with threaded holes in the rectangular base plate. By limiting the angle between the vertical positioning surface and the horizontal support surface to between 85 and 95 degrees, and by using a connection method where bolts pass through bolt holes in the horizontal support surface and engage with threaded holes in the rectangular base plate, the L-shaped positioning blocks can form a stable support structure when bearing the weight and operating force of the pipeline. The vertical positioning surface provides lateral constraint force, while the horizontal support surface provides bottom support force. The two forces are nearly perpendicular, effectively dispersing the force and avoiding stress concentration. Furthermore, the bolt connection method allows for adjustment of the spacing between the two L-shaped positioning blocks according to different pipeline lengths, improving the applicability and flexibility of the device.

[0007] The longitudinal guide groove has a T-shaped cross-section, and the bottom of the main scale is fixed inside the groove for a secure connection. This achieves precise positioning and firm fixation between the main scale and the rectangular base plate, effectively preventing lateral swaying or detachment of the main scale during use, and ensuring the positional stability of the scale graduations and the reliability of the measurement reference.

[0008] The bottom sides of the vernier slider are provided with sliding protrusions. The shape of the sliding protrusions matches the space inside the groove of the T-shaped structure. When the sliding protrusions slide along the longitudinal direction inside the T-shaped structure, they remain in contact with the side wall of the T-shaped structure. This technical solution, which involves setting sliding protrusions at the bottom of the vernier slider that match the space inside the groove of the T-shaped structure and ensuring they remain in contact with the side wall of the T-shaped structure during sliding, ensures that the vernier slider maintains the straightness and consistency of its movement trajectory throughout its movement along the longitudinal guide groove. This avoids the vernier slider from tilting or getting stuck. Simultaneously, the friction generated by the continuous contact between the sliding protrusions and the side wall ensures that the vernier slider remains stable at any position without free sliding, improving the accuracy and repeatability of the drilling reference position setting.

[0009] The laser pointer has a cylindrical outer shell and is fixed to the top of the vernier slider via a threaded connection. The central axis of the laser pointer coincides with the central axis of the vernier slider. By designing the laser pointer as a cylindrical outer shell and fixing it to the top of the vernier slider via a threaded connection, ensuring that their central axes coincide, the crosshair projected by the laser pointer is always perpendicular to the upper surface of the rectangular base plate and accurately aligned with the scale position indicated by the vernier slider. This eliminates laser reference line offset errors caused by installation deviations. Furthermore, the threaded connection facilitates quick assembly and disassembly when the laser pointer needs maintenance or replacement, and the cylindrical outer shell structure provides excellent protection and heat dissipation for the laser emitting assembly.

[0010] The rectangular base plate has circular anti-slip pads at each of its four corners. These pads are made of rubber and are 3mm to 8mm thick. They are adhesively fixed to the bottom surface of the rectangular base plate. This design, using circular anti-slip pads of 3mm to 8mm thickness at each corner and adhesively fixed to the bottom surface, ensures excellent anti-slip performance when the device is placed on the workbench due to the high coefficient of friction of the rubber material. This effectively prevents the device from shifting due to lateral forces or vibrations during operation. The appropriate thickness range ensures sufficient cushioning while preventing instability, thus improving the stability and safety of the drilling operation.

[0011] The inner surface of the arc-shaped positioning groove is provided with multiple parallel anti-slip patterns. These patterns extend along the arc length of the groove, with a spacing of 2mm to 5mm between adjacent patterns. This design significantly increases the friction between the positioning groove surface and the outer circumferential surface of the busbar. The raised portions of the anti-slip patterns can embed into tiny depressions on the busbar surface or mechanically interlock with the surface oxide layer, effectively preventing the busbar from slipping axially due to its own weight or external forces while in the positioning state. Simultaneously, the reasonable pattern spacing ensures both anti-slip effectiveness and avoids significant indentation damage to the busbar surface.

[0012] The rectangular base plate is made of steel, the L-shaped positioning block is made of aluminum alloy, and the main scale is made of stainless steel. By selecting steel for the rectangular base plate to provide sufficient strength and rigidity as the overall support foundation, using aluminum alloy for the L-shaped positioning block to achieve a lighter weight and good machinability for forming precise arc-shaped positioning grooves, and using stainless steel for the main scale to obtain excellent wear resistance and corrosion resistance to ensure the scale lines remain clear over long-term use, this technical solution achieves an optimal match between the material properties and functional requirements of each component. The high strength and load-bearing capacity of the steel plate ensures that the entire device does not deform, the lightweight properties of the aluminum alloy reduce the operational burden, and the stability of the stainless steel ensures the long-term maintenance of measurement accuracy.

[0013] The distance between the two L-shaped positioning blocks is 150mm to 350mm along the length of the rectangular base plate, the height of the vertical positioning surface is 60mm to 100mm, and the extension length of the horizontal support surface along the width of the rectangular base plate is 30mm to 70mm. By limiting the distance between the two L-shaped positioning blocks to 150mm to 350mm, the height of the vertical positioning surface to 60mm to 100mm, and the extension length of the horizontal support surface to 30mm to 70mm, the device can adapt to the positioning needs of busbars of various lengths and diameters commonly found in converter station projects. The reasonable spacing range can accommodate shorter busbar segments while providing stable two-point support for longer busbars. The appropriate height of the vertical positioning surface ensures effective lateral constraint for busbars of different diameters, while the extension length of the horizontal support surface provides sufficient operating space for bolt installation and enhances the stability of the support. The coordination of these dimensions significantly improves the versatility and practicality of the device.

[0014] Furthermore, the height of the vertical positioning surface should simultaneously consider the outer diameter of the tube generatrix and the central angle of the arc-shaped positioning groove, and their relationship can be defined by the equation: The equation is used to determine the reasonable height of the vertical positioning surface based on the outer diameter of the pipe busbar and the central angle of the arc-shaped positioning groove. The inputs include the outer diameter of the pipe busbar (which can be directly measured) and the central angle (80 to 120 degrees). The output is the design value of the vertical positioning surface height. The first term of the equation... The vertical distance from the center of the tube busbar to the highest point of the arc-shaped positioning groove was calculated. (Second item) An additional margin is added to the radius of the busbar. The sum of the two ensures that the height of the vertical positioning surface can not only fully cover the highest position of the busbar after it is supported by the arc-shaped positioning groove, but also reserve operating space to avoid height mismatch caused by different central angles.

[0015] It should be noted that this utility model, through its integrated structural design including a rectangular base plate, an L-shaped positioning block assembly with an arc-shaped positioning groove, and a scale slider assembly equipped with a laser pointer, fundamentally solves the core technical problems of inaccurate positioning and poor repeatability in busbar drilling operations. It achieves an organic combination of stable support positioning of the busbar and precise marking of the drilling position. Compared to the traditional positioning method using simple measuring tools and manual marking, the arc-shaped positioning groove of this device can form a large-area contact with the outer circumference surface of the busbar, thus providing reliable positional constraints. The spatial constraint structure formed by the vertical positioning surface and horizontal support surface of the L-shaped positioning block effectively restricts the multiple degrees of freedom movement of the busbar. The precise sliding of the vernier slider along the longitudinal guide groove in the scale slider assembly, combined with the main scale graduations, achieves quantitative setting of the drilling position. The cross-shaped reference line projected by the laser pointer transforms the abstract scale reading into a direct visual mark on the surface of the busbar, allowing operators to... The device can quickly and accurately determine the center position of the drill hole without repeated measurement and marking, significantly improving positioning accuracy and work efficiency. The T-shaped guide rail groove and sliding protrusion design ensure the linearity and positional stability of the vernier slider movement. The anti-slip texture and anti-slip pad enhance the friction and fixation effect between the busbar and the device, and between the device and the worktable, respectively. The overall structure is simple and reasonable, and the materials of each component are scientifically selected. The steel plate base provides a solid foundation, the aluminum alloy positioning block combines strength and lightweight, and the stainless steel ruler ensures long-term accuracy. The reasonable limitation of multiple dimensional parameters makes the device highly versatile and can adapt to the positioning needs of different specifications of busbars. The application of this device enables the standardization and normalization of busbar drilling operations in converter stations, ensuring a high degree of consistency in the drilling position of the same or different batches of busbars. This reduces installation and coordination problems and rework caused by positioning errors, improves the overall construction quality and project progress, and reduces labor costs and material waste. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure.

[0017] Figure 2 This is a schematic diagram for positioning.

[0018] Explanation of reference numerals in the attached drawings: 01, rectangular base plate; 11, longitudinal guide rail groove; 02, L-shaped positioning block; 21, arc-shaped positioning groove; 31, main scale; 32, vernier slider; 33, laser pointer; 90, tube busbar; 91, cross-shaped reference line. Detailed Implementation

[0019] 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.

[0020] like Figure 1 As shown, the converter station busbar drilling reference positioning device provided by this utility model includes a rectangular base plate 01, a positioning block assembly, and a scale slider assembly. The upper surface of the rectangular base plate is provided with a longitudinal guide groove 11. On both sides of the longitudinal guide groove, the positioning block assembly includes two L-shaped positioning blocks 02. Each L-shaped positioning block is composed of a vertical positioning surface and a horizontal support surface. The inner side of the vertical positioning surface is provided with an arc-shaped positioning groove 21. On both sides of the longitudinal guide groove, two L-shaped positioning blocks are respectively erected opposite to each other on the rectangular base plate. The L-shaped positioning blocks on the surface of the rectangular base plate are symmetrically fixed at the two side edges of the rectangular base plate. The arc surface of the arc-shaped positioning groove is used to fit the outer circumferential surface of the tube busbar. The scale slider assembly includes a main scale 31 and a vernier slider 32. The main scale is fixedly installed in the longitudinal guide rail groove. The vernier slider can slide along the longitudinal guide rail groove. A laser indicator head 33 is provided at the top of the vernier slider. The laser indicator head is used to project a cross-shaped reference line 35 on the surface of the tube busbar 34 after the vernier slider is displaced. This device combines an L-shaped positioning block assembly with an arc-shaped positioning groove with a scale slider assembly that can slide along the longitudinal guide groove. This allows the busbar to be stably fitted within the arc-shaped positioning groove. At the same time, the cross-shaped reference line projected by the laser pointer onto the surface of the busbar provides clear visual guidance for the drilling position, achieving precise positioning of the busbar during the drilling process. This solves the problems of busbar position offset and difficulty in accurately determining the reference point under traditional positioning methods, significantly improving the positioning accuracy and ease of operation of the drilling operation, and laying a reliable foundation for subsequent precision machining operations.

[0021] The specific application of this utility model is as follows: First, the converter station busbar drilling reference positioning device is placed on a flat and stable workbench. The four rubber anti-slip pads on the bottom surface of the rectangular base plate are in full contact with the workbench to ensure the device remains stable and does not move. Then, the distance between the two L-shaped positioning blocks is adjusted according to the radial length of the busbar to be processed. After loosening the bolts fixing the L-shaped positioning blocks, the bolt positions are as follows: Figure 1At the position indicated by the dotted line, move the positioning block along the width of the rectangular base plate to the appropriate position and tighten the bolts to complete the fixation. Next, place the busbar horizontally between the two L-shaped positioning blocks, so that the outer circumference of the busbar naturally embeds into the arc-shaped positioning groove on the inner side of the L-shaped positioning block. At this time, the busbar is tightly attached to the bottom of the groove under the action of gravity and is kept stable by the lateral constraint of the vertical positioning surface. Slightly rotate the busbar to adjust its circumferential position so that the surface of the busbar to be drilled faces upward for subsequent operations. Then, determine the coordinate value of the drilling position along the axial direction of the busbar according to the engineering drawings or technical requirements. Hold the vernier slider and slide it smoothly along the longitudinal guide rail groove. Observe the correspondence between the indicator line on the vernier slider and the scale of the main scale. Stop sliding when the indicator line is aligned with the target scale value. At this time, the friction between the sliding protrusion of the vernier slider and the side wall of the T-shaped guide rail groove will keep the slider in the current position and prevent it from sliding freely. Turn on the power switch of the laser indicator head, and the laser beam will start from the indicator. The laser pointer emits a laser beam and forms a clear crosshair on the surface of the busbar. The intersection of the crosshairs is the center of the hole. The operator holds a drill or other drilling tool, aligns the drill tip with the intersection of the laser crosshairs, and keeps the drill axis perpendicular to the surface of the busbar before starting the drilling operation. During the drilling process, the feed rate should be controlled to avoid displacement of the busbar due to excessive cutting force. After drilling, the power to the laser pointer is turned off and the hole position is checked to ensure it meets the requirements. If drilling is required at other positions on the same busbar, the above vernier slider adjustment and laser positioning steps are repeated. If drilling is required at the same position on multiple busbars, only the busbar needs to be replaced without readjusting the vernier slider position to ensure consistency of the drilling position on each busbar. After the operation is completed, clean the debris and oil stains from the rectangular base plate and the arc-shaped positioning groove. Check whether the connecting bolts are loose and perform necessary tightening and maintenance. Store the device in a dry and ventilated environment to maintain its accuracy and service life.

[0022] like Figure 2As shown, the principle of this utility model is as follows: This device solves the core problem of inaccurate positioning of busbars during drilling by constructing a three-layer functional integrated system consisting of a rectangular base plate as a rigid reference platform, an L-shaped positioning block assembly providing spatial constraints, and a scale slider assembly for position measurement and marking. Its working principle is reflected in the synergistic effect of multiple aspects. First, there is the stable positioning principle of the busbar. When the busbar is placed between two L-shaped positioning blocks, the outer circumferential surface of the busbar forms an arc-shaped contact with the inner surface of the arc-shaped positioning groove. Since the radius of the arc-shaped groove matches the outer diameter of the busbar, and the central angle corresponding to the arc length of the groove reaches 80 to 120 degrees, this geometric relationship allows the busbar to naturally embed itself into the lowest point of the groove under the action of gravity. The curved surfaces on both sides prevent lateral rolling, while the vertical positioning surface of the L-shaped positioning block restricts the axial movement of the tube busbar. The horizontal support surface transfers the gravity of the tube busbar to the rectangular base plate. This three-dimensional spatial constraint structure effectively eliminates multiple degrees of freedom of movement of the tube busbar. Secondly, regarding the precise measurement and positioning principle, the longitudinal guide rail groove provides a fixed installation reference for the main scale. The scale system of the main scale establishes a position coordinate system along the length of the rectangular base plate. The vernier slider achieves smooth sliding along a fixed trajectory through the precise cooperation between its bottom sliding protrusion and the T-shaped guide rail groove. The operator moves the vernier slider to the corresponding mark on the main scale according to the drilling position requirements. At this time, the spatial position of the vernier slider represents the coordinate value of the drilling point along the axial direction of the tube busbar. Thirdly, there is the principle of laser vision guidance. A laser pointer mounted on the top of the vernier slider emits a laser beam, which is projected onto the surface of the busbar through optical elements. Because the central axis of the laser pointer coincides with the central axis of the vernier slider and is perpendicular to the upper surface of the rectangular base plate, the intersection of the crosshairs accurately corresponds to the projection point of the vernier slider. This optical projection method transforms abstract scale readings into intuitive, visible marks on the surface of the busbar. Operators can directly perform drilling operations at the laser-indicated points without manually drawing lines on the busbar surface. Fourthly, there is the principle of anti-slip fixing. The parallel anti-slip texture on the inner surface of the arc-shaped positioning groove increases the roughness of the contact surface. The raised parts of the texture mechanically engage with the surface of the busbar. The static friction is significantly improved, effectively preventing the busbar from sliding axially in the positioning state. The rubber anti-slip pads at the four corners of the rectangular base plate firmly fix the entire device to the worktable using the high coefficient of friction of the rubber material. These anti-slip mechanisms collectively ensure the overall stability of the positioning system. Fifthly, the adjustable adaptability principle allows for adjustment of the spacing between the two L-shaped positioning blocks, connected to the rectangular base plate by bolts, according to the length of the busbar. The radius of the arc-shaped positioning groove is designed to accommodate busbars of different outer diameters. The free sliding of the vernier slider within the guide rail groove enables continuous adjustment of the drilling position. This multi-parameter adjustable design significantly expands the device's applicability. It is through the organic combination of these multiple principles that the device achieves its success.This device achieves precise control over the entire process of busbar installation, from support placement to position measurement and drilling marking. It ensures the stability of the positioning reference from a mechanical structure perspective, the accuracy of position setting from a measurement system perspective, and the convenience of operation from a visual guidance perspective. Therefore, it fundamentally solves the problems of inaccurate drilling positioning caused by unstable supports, measurement errors, and unclear markings in traditional methods.

[0023] The following is a specific embodiment 1 of this utility model. The converter station busbar drilling reference positioning device provided in this embodiment specifically includes the following components and structures: a rectangular base plate is made of steel plate material with a thickness of 8mm. The length of the rectangular base plate is 400mm and the width is 200mm. The upper surface of the rectangular base plate is processed to ensure that the flatness error does not exceed 0.1mm. The surface is coated with a rust-proof paint layer with a thickness of 0.05mm. A longitudinal guide rail groove is opened along the length direction at a position 50mm away from the front edge on the upper surface of the rectangular base plate. The cross-section of the guide rail groove is T-shaped. The groove opening width is 12mm, the groove depth is 8mm, and the groove bottom width is 20mm. The processing of the T-shaped groove ensures the parallelism of the groove wall and the flatness of the groove bottom. The positioning block assembly includes two identical L-shaped... The L-shaped positioning block is manufactured in one piece from 6061 aluminum alloy using a CNC machining center. The vertical positioning surface of the L-shaped positioning block is 80mm high and 10mm thick, while the horizontal support surface is 50mm wide and 10mm thick. The vertical positioning surface and the horizontal support surface are connected by a rounded transition. An arc-shaped positioning groove is formed on the inner side of the vertical positioning surface. The radius of this groove is 40mm, which can accommodate pipes with an outer diameter of 70mm to 90mm. The groove depth is 8mm, and the central angle corresponding to the arc length of the groove is 100 degrees. Nine parallel anti-slip lines are machined on the inner surface of the arc-shaped positioning groove using a precision milling cutter. The lines extend along the arc length of the groove, and the cross-section of each line is triangular, with a base width of 1.5mm and a height of 0.The width is 8mm, the spacing between adjacent patterns is 3mm, and three bolt through holes are evenly distributed along the length of the horizontal support surface. The diameter of the through holes is 9mm, and the distances from the center of the through holes to the front edge of the horizontal support surface are 10mm, 25mm, and 40mm, respectively. Two L-shaped positioning blocks are fixed to the rectangular base plate by six M8 hexagonal head bolts. The initial spacing between the two positioning blocks is set to 250mm, which is suitable for positioning of busbars with a length of 300mm to 400mm. The main scale in the scale slider assembly is made of 304 stainless steel. The main scale is 280mm long, 18mm wide, and 3mm thick. It is embedded in the T-shaped guide rail groove on the rectangular base plate. The upper surface of the main scale is laser-etched. The vernier slider features a 40mm graduation mark and is made of aluminum alloy. The main body of the slider is a T-shaped block structure adapted to a T-slot, measuring 40mm in length, 25mm in width, and 15mm in height. Sliding protrusions on both sides of the bottom of the slider precisely match the internal space of the T-shaped guide groove, ensuring smooth sliding and preventing wobbling. A threaded blind hole is located at the center of the top of the slider. The laser pointer housing is cylindrical, made of anodized black aluminum alloy. External threads are machined at the bottom of the laser pointer to connect with the threaded blind hole at the top of the slider. The laser pointer houses a 635nm wavelength red semiconductor laser with a power of 5mW, meeting safety requirements. The laser beam is shaped into a cross-shaped spot by the lens assembly. The crosshair length is 20mm at a distance of 200mm, and the line width is 0.5mm. The laser pointer is powered by two AAA alkaline batteries connected in series to provide a 3V DC voltage. A toggle power switch is installed on the side of the pointer. Circular anti-slip pads made of nitrile rubber are attached to the four corners of the rectangular base plate. In practical application, the working principle of this device is as follows: when an 80mm outer diameter copper busbar is placed in the arc-shaped positioning groove of the two L-shaped positioning blocks, the outer circumferential surface of the busbar forms an approximately 85-degree arc-length contact with the inner surface of the 40mm radius groove. The nine anti-slip raised parts on the inner surface of the groove embed into the oxide layer on the surface of the busbar. The static friction generated is sufficient to prevent the busbar from slipping under axial thrust. The operator slides the vernier slider along the guide rail groove to the 150mm mark on the main scale. The friction generated by the sliding protrusions on both sides of the vernier slider and the sidewall of the T-slot keeps the slider stable at this position. After the laser pointer is powered on, a red crosshair laser reference line is projected onto the surface of the busbar. The positional accuracy of the intersection of the crosshairs relative to the position of the main scale does not exceed 0.3mm. The operator uses a 12mm diameter twist drill bit to drill a hole at the laser intersection. After drilling, the actual distance between the center of the hole and the end face of the busbar is measured. After processing 10 busbars, the measurement data shows that the deviation of each hole position from the set value is 0.Within 5mm, the positioning accuracy is improved by approximately 5 times compared to traditional manual measurement and marking methods. The positioning time for a single busbar is reduced from 8 minutes to 2 minutes, significantly improving processing efficiency and positional consistency. In this embodiment, the rectangular base plate, rigidly supported by an 8mm thick steel plate, ensures that the base plate deflection does not exceed 0.05mm when bearing the weight of a 50kg busbar. The aluminum alloy material of the L-shaped positioning blocks meets strength requirements while keeping the weight of a single positioning block to 0.8kg for easy installation and adjustment. The stainless steel main scale remains clearly legible with no significant wear after 2000 cycles of sliding friction of the vernier slider. The laser pointer maintains stable spot quality after 50 hours of continuous operation. The total weight of the entire device is 6.5kg, facilitating on-site transport and use.

[0024] The following is a specific embodiment 2 of this utility model. This embodiment is based on embodiment 1, and the structure of the arc-shaped positioning groove is improved and optimized. The radius of the arc-shaped positioning groove is adjusted to 30mm to adapt to smaller specification busbars with an outer diameter of 50mm to 70mm. The central angle corresponding to the arc length of the groove is increased to 110 degrees to provide a larger contact arc surface and enhance positioning stability. At the same time, the number of anti-slip patterns is increased to 13, and the cross-sectional shape of each pattern is changed to a trapezoidal structure. The upper base width is 0.8mm, the lower base width is 2mm, and the height is 1mm. The spacing between adjacent patterns is reduced to 2mm. This trapezoidal pattern design makes the pattern... The raised section of the road has better wear resistance. A reinforcing rib is added at the connection between the vertical positioning surface and the horizontal support surface. The reinforcing rib is 8mm thick and 30mm high. The reinforcing rib is connected to the two surfaces by welding and then annealed to eliminate welding stress. This structural improvement increases the deformation resistance of the L-shaped positioning block under lateral force by about 40%. This embodiment is suitable for converter station construction scenarios that require the processing of smaller diameter tube busbars and higher positioning stability. After actual testing, the axial anti-slip capability of this improved structure for aluminum alloy tube busbars with an outer diameter of 60mm reaches more than 200 Newtons, and the positioning accuracy is maintained within 0.3mm.

[0025] The following is another specific embodiment 3 of this utility model. This embodiment is based on embodiment 1, and the function of the scale slider assembly is extended and improved. A digital display window is added to the side of the vernier slider. The display window has a size of 25mm x 15mm. An LCD digital display screen is installed in the window. The display screen is connected to the sliding mechanism through a micro encoder. The encoder is fixedly installed at the end of the T-shaped guide rail groove. A gear is installed on the encoder shaft and meshes with the rack at the bottom of the vernier slider. When the vernier slider slides along the guide rail groove, the rack drives the gear to rotate, thereby driving the encoder shaft to rotate. The encoder converts the rotation angle into linear displacement data and transmits it to the LCD screen through a signal line. The display screen displays the displacement value of the vernier slider relative to the zero point position in real time, with a numerical accuracy of 0. The display screen is powered by a button battery, which is installed in the battery compartment inside the vernier slider. An adjustable focus function has been added to the laser pointer head. By rotating the focusing ring on the laser pointer head housing, the relative position of the internal lens group can be changed, thereby adjusting the clarity and size of the crosshair spot at different working distances. The focusing range is 100mm to 300mm. This improved design of digital display and adjustable focus further enhances the measurement convenience and adaptability of the device, making it particularly suitable for high-volume processing scenarios that require frequent changes of different diameter busbars and high positioning efficiency. Practical applications show that the digital display function increases the operator's reading speed by approximately 60%, and the adjustable focus laser pointer head maintains a clear crosshair reference line at different working distances.

[0026] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A reference positioning device for drilling holes in a converter station busbar, characterized in that, The device includes a rectangular base plate, a positioning block assembly, and a scale slider assembly. The upper surface of the rectangular base plate is provided with a longitudinal guide groove. The positioning block assembly includes two L-shaped positioning blocks that are respectively erected opposite each other on the surface of the rectangular base plate on both sides of the longitudinal guide groove. Each L-shaped positioning block is composed of a vertical positioning surface and a horizontal support surface. The inner side of each vertical positioning surface is provided with an arc-shaped positioning groove for placing a busbar. The two L-shaped positioning blocks are symmetrically fixed to the two side edges of the rectangular base plate through their respective horizontal support surfaces. The arc surface of the arc-shaped positioning groove is used to fit the outer circumferential surface of the busbar. The scale slider assembly includes a main scale and a vernier slider. The main scale is fixedly installed in the longitudinal guide groove, and the vernier slider can slide along the longitudinal guide groove.

2. The converter station busbar drilling reference positioning device according to claim 1, characterized in that, A laser pointer is fixedly installed at the top of the vernier slider. The laser pointer is used to project a cross-shaped reference line onto the surface of the tube busbar at the position of the vernier slider displacement.

3. The converter station busbar drilling reference positioning device according to claim 2, characterized in that, The angle between the vertical positioning surface and the horizontal support surface is 85 degrees to 95 degrees. The lower surface of the horizontal support surface is connected to the rectangular base plate by bolts. The bolts pass through bolt through holes opened on the horizontal support surface and engage with threaded holes in the rectangular base plate.

4. The converter station busbar drilling reference positioning device according to claim 3, characterized in that, The longitudinal guide rail groove has a T-shaped cross-section, and the bottom of the main scale has an outline that matches the bottom of the T-shaped structure, thus achieving a fixed connection.

5. The converter station busbar drilling reference positioning device according to claim 4, characterized in that, The bottom of the vernier slider is provided with a sliding protrusion that matches the longitudinal guide groove. The shape of the sliding protrusion matches the space inside the groove of the T-shaped structure. When the sliding protrusion slides in the longitudinal direction inside the T-shaped structure, it remains in contact with the side wall of the T-shaped structure.

6. The converter station busbar drilling reference positioning device according to claim 5, characterized in that, The outer shell of the laser pointer is cylindrical, and the laser pointer is fixed to the top of the vernier slider by a threaded connection. The central axis of the laser pointer coincides with the central axis of the vernier slider.

7. The converter station busbar drilling reference positioning device according to claim 6, characterized in that, The rectangular base plate has circular anti-slip pads at its four corners. The circular anti-slip pads are made of rubber and have a thickness of 3mm to 8mm. The circular anti-slip pads are fixed to the bottom surface of the rectangular base plate by adhesive bonding.

8. The converter station busbar drilling reference positioning device according to claim 7, characterized in that, The inner surface of the arc-shaped positioning groove is provided with multiple parallel anti-slip patterns. The anti-slip patterns extend along the arc length direction of the arc-shaped positioning groove, and the spacing between two adjacent anti-slip patterns is 2mm to 5mm.

9. The converter station busbar drilling reference positioning device according to claim 8, characterized in that, The relationship between the height of the vertical positioning surface, the outer diameter of the tube busbar, and the central angle of the arc-shaped positioning groove is: vertical positioning surface height = outer diameter of tube busbar × (1 - cos(central angle / 2)) + outer diameter of tube busbar × 0.

5.

10. The converter station busbar drilling reference positioning device according to claim 9, characterized in that, The distance between the two L-shaped positioning blocks is 150mm to 350mm along the length of the rectangular base plate, the height of the vertical positioning surface is 60mm to 100mm, and the extension length of the horizontal support surface along the width of the rectangular base plate is 30mm to 70mm.

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