A converter station bus duct hole angle adjusting device

Abstract

The utility model provides a kind of commutation station pipe bus punching angle adjusting device, belong to electric power device technical field, including the electric control round turntable fixed on construction surface, the round turntable has angle rotation motor, the round turntable surface has multiple T-shaped slots, through the displacement after the universal support fixed in the T-shaped slot in gage plate, the other end of the universal support is connected with the main shaft support of bench drill type by universal joint, the main shaft support has motor in, the main shaft support outer surface, has hand wheel for controlling drill bit displacement;With the hand wheel opposite another side, have two with the drill bit parallel positioning rod, the one end of two positioning rods is used to abut the outer surface of the arc surface or fitting of pipe bus, the other end of two positioning rods is mutually fixed connection, two positioning rods are slid in respective copper sliding sleeve by external force, the sliding sleeve is fixed on the shell surface of the main shaft support, solved the technical problem that hole position precision is low in the existing pipe bus punching operation process.

Description

Technical Field

[0001] This utility model belongs to the field of power equipment technology, and specifically relates to a converter station busbar drilling angle adjustment device. Background Technology

[0002] As a crucial hub for AC and DC conversion in a power system, the installation quality of the internal busbars in a converter station directly affects the safe and stable operation of the power station. Busbars are typically arc-shaped tubular components made of aluminum alloy or copper. During installation, holes need to be drilled at specific locations on the surface of the busbars for installing connecting hardware and fixing accessories. Due to the complex internal spatial layout of converter stations and the diverse installation positions and routes of the busbars, drilling positions are often at arbitrary angles in space, including horizontal, inclined, and vertical holes. Current technology mainly uses handheld electric drills or ordinary bench drills for drilling. Operators need to judge the drilling angle based on the drawings, experience, and visual inspection, and then drill the holes using the handheld electric drill or by adjusting the angle of the bench drill. This method has significant drawbacks. While handheld electric drills are flexible, they lack stability, are prone to shaking and deviation during drilling, making it difficult to guarantee hole accuracy. Furthermore, the high labor intensity for operators, especially during prolonged operation, can lead to fatigue and errors. While conventional bench drills offer good stability, their angle adjustment capabilities are limited, typically allowing only small-range adjustments within a single plane. This fails to meet the complex spatial angle requirements of busbar installations. Some construction companies have attempted multi-axis adjustable drilling equipment, but these devices are structurally complex, cumbersome to adjust, and require repeated trial drilling to find the correct angle, resulting in low efficiency. More importantly, existing drilling equipment generally lacks an effective positioning mechanism, making it prone to slippage when the drill bit contacts the workpiece surface. This is especially true when drilling on the curved surfaces of busbars, where the unstable contact surface makes the drill bit more likely to deviate from its intended position, leading to excessive hole deviations. This affects subsequent connection and installation, and can even render the busbar unusable, increasing construction costs and time risks. In other words, existing technologies suffer from insufficient drilling accuracy. Utility Model Content

[0003] In view of this, the present invention provides a converter station busbar drilling angle adjustment device, which can solve the technical problem of insufficient drilling accuracy in the prior art during converter station busbar drilling operations. The device includes an electrically controlled rotary table fixed to the construction surface. The rotary table has an angle rotation motor. The surface of the rotary table has multiple T-slots. A universal bracket, after displacement, is fixed in the T-slots by a pressure plate. The other end of the universal bracket is connected to a bench drill-type spindle frame via a universal joint. The spindle frame contains a motor. A handwheel for controlling drill bit displacement is located on the outer surface of the spindle frame. On the opposite side of the handwheel, there are two positioning rods parallel to the drill bit. One end of each positioning rod abuts against the arc surface of the busbar or the outer surface of the fittings. The other ends of the two positioning rods are fixedly connected to each other. The two positioning rods slide within their respective copper sliding sleeves under external force. The sliding sleeves are fixed to the outer surface of the spindle frame. This device uses an angle-rotating motor on a rotary table to drive the entire drilling assembly for angle adjustment. Combined with a multi-degree-of-freedom connection via a universal bracket and universal joint, the spindle can achieve arbitrary angle positioning within space, solving the problem of precise angle adjustment during busbar installation. Two positioning rods are set parallel to the drill bit and abut against the workpiece surface, providing a stable positioning reference during drilling, preventing drill bit deviation, and ensuring accurate drilling position. The design of the positioning rods sliding within a copper sleeve under external force allows them to automatically adjust their extension length according to the shape of the workpiece surface, adapting to the different curvatures of busbar arc surfaces or hardware outer surfaces, improving the device's applicability and positioning reliability.

[0004] The two positioning rods have threaded ends for abutting, allowing for the installation of one or two positioning plates. This threaded design increases the flexibility and versatility of the positioning contact surface. When the workpiece surface is a large-curvature arc surface, a single positioning plate can achieve stable contact; when the workpiece surface is relatively flat or a larger contact area is required, installing two positioning plates provides more robust support. The threaded connection makes the installation and removal of the positioning plates very convenient. Operators can quickly change the positioning plate configuration according to actual construction needs, improving the device's adaptability to different working conditions and reducing construction preparation time.

[0005] It also includes a telescopic sleeve for auxiliary support, one end of which is fitted onto the central column of the rotary table and extended through a hinge, while the other end is connected to the middle of the main spindle frame via a universal joint. The telescopic sleeve, with one end fitted onto the central column of the rotary table and the other end connected to the middle of the main spindle frame via a universal joint, forms a three-point support structure, significantly enhancing the stability of the entire drilling device. The telescopic function of the sleeve allows it to adapt to spatial changes in the main spindle frame at different angles and positions, maintaining effective support at all times. The hinged design allows the telescopic sleeve to swing freely with the angle adjustment of the main spindle frame without interfering with or hindering the angle adjustment. This auxiliary support structure effectively distributes the load borne by the universal joint, reducing vibration and swaying during drilling, and improving drilling accuracy and construction safety.

[0006] The rotary turntable employs a circular disc structure, with its central column extending perpendicular to the disc surface and its axis coinciding with the geometric center. This design ensures excellent rotational symmetry and dynamic balance during angular rotation. The vertical setting of the central column provides a stable guiding reference for the telescopic sleeve, allowing it to maintain coaxial movement during the turntable's rotation and preventing eccentric wobbling. The coincidence of the turntable's geometric center with its rotation axis ensures uniform force distribution when the angle-adjusting motor drives the turntable, reducing motor load and mechanical wear, extending the device's lifespan, and improving the accuracy and smoothness of angle adjustment.

[0007] The universal joint employs either a ball joint or a cross-shaped universal joint structure, enabling multi-degree-of-freedom angle transmission and position adjustment to meet the spindle's attitude adjustment requirements in any direction within space. The two ends of the universal joint are threadedly connected to the universal bracket and the spindle, respectively. This connection method is not only convenient for installation and disassembly but also provides high connection strength, capable of withstanding the torque and radial force generated during drilling. The threaded connection also features a self-locking function; after the spindle is adjusted to the target angle, the threaded connection reliably locks that angle position, preventing angle deviation due to vibration during drilling and ensuring the stability and consistency of the drilling angle.

[0008] The copper sliding sleeve is cylindrical, and the gap between the inner diameter of the copper sliding sleeve and the outer diameter of the positioning rod is 0.1mm to 0.5mm. The positioning rod slides axially within the copper sliding sleeve. The precise 0.1mm to 0.5mm gap between the inner diameter of the copper sliding sleeve and the outer diameter of the positioning rod ensures smooth axial sliding of the positioning rod within the sleeve while limiting radial wobble. Copper material has good wear resistance and self-lubricating properties, reducing frictional resistance and wear during frequent sliding of the positioning rod, thus extending the service life of the device. The precisely controlled gap design ensures smooth movement of the positioning rod under external force, preventing jamming or looseness, ensuring accurate response to changes in the workpiece surface shape, achieving precise positioning, and improving the positional accuracy of drilling.

[0009] The T-slots are arranged radially along the turntable, with multiple T-slots evenly distributed radially around the geometric center of the turntable. This layout allows the universal bracket to be installed and adjusted at any radial position on the turntable surface. The radially distributed T-slots provide multiple discrete installation positions for the universal bracket. Operators can select the most suitable T-slot for installation based on the specific location of the busbar and the required drilling angle, achieving radial adjustment of the drilling position. This design also ensures a uniform distribution of structural strength on the turntable, avoiding localized stress concentration and improving the turntable's load-bearing capacity and overall structural stability.

[0010] The pressure plate is a rectangular plate structure, which is bolted through mounting holes in the pressure plate and locked into the T-slot, forming a reliable fixed connection. The shape of the rectangular pressure plate matches the shape of the T-slot, providing a large contact area and clamping force when the bolts are tightened, ensuring that the universal bracket is firmly and reliably fixed on the turntable and will not loosen or shift during the drilling process. The pressure plate presses against the bottom of the universal bracket. This layered fixing method facilitates the installation and disassembly of the universal bracket. At the same time, the pressure plate acts as an intermediate transition component, absorbing some of the vibration generated during drilling, reducing the transmission of vibration to the turntable, and improving the vibration resistance of the entire device.

[0011] The spindle housing features a rectangular shell structure, providing ample mounting space and excellent protection for the internal motor and transmission mechanism. The handwheel is located on one side of the spindle housing, while two positioning rods are positioned on the opposite side. This symmetrical arrangement ensures that when the operator turns the handwheel to control the drill bit feed, the positioning rods move synchronously towards or away from the workpiece surface, maintaining a stable relative position between the drill bit and the positioning rods. This relative arrangement of the handwheel and positioning rods allows the operator to control the feed and observe the positioning status from one side, providing convenient operation and a clear view, reducing operational errors, and improving the efficiency and safety of drilling operations.

[0012] The positioning plate is either circular or square, with a threaded hole at its center. It is screwed onto the threaded end of the positioning rod via this hole. The outer surface of the positioning plate abuts against the busbar or fittings. The circular or square positioning plate with its central threaded hole allows for quick installation and adjustment. Circular positioning plates are suitable for abutting the arc-shaped surface of the busbar, as their circular edges form good line or surface contact. Square positioning plates are suitable for abutting the flat or angular parts of fittings, providing a larger contact area and support. The outer surface of the positioning plate directly abuts against the workpiece, increasing the positioning contact area, dispersing positioning pressure, and avoiding surface damage that might occur when the end of the positioning rod directly contacts the workpiece. This improves positioning stability and reliability, adapting to the positioning needs of workpieces with different materials and surface conditions.

[0013] It should be noted that this utility model achieves horizontal angle adjustment of the drilling device through a rotary motor rotating a circular turntable. Combined with the multi-degree-of-freedom connection of the universal bracket and universal joint, this allows the spindle frame to achieve precise positioning at any angle in three-dimensional space, completely solving the problem of difficult angle adjustment for drilling of pipe busbars. The structure of two positioning rods parallel to the drill bit and sliding within a copper sleeve allows the positioning rods to automatically adapt to the shape changes of the pipe busbar's arc surface or the outer surface of the fitting, providing a stable and reliable positioning reference, effectively preventing drill bit deviation during drilling, and significantly improving hole position accuracy. The threaded design at the end of the positioning rods, combined with the replaceable positioning plate, enhances the device's adaptability to different workpiece surface shapes and expands its application range. The three-point support structure formed by the telescopic sleeve significantly improves the overall stability of the device, reduces drilling vibration, and further ensures drilling quality. The radial layout of the T-slots and the pressure plate fixing method allow the installation position of the universal bracket to be flexibly adjusted on the surface of the circular turntable, meeting the needs of different construction positions. The entire device has a compact and reasonable structure, is easy and quick to operate, and can achieve precise drilling without complicated debugging processes. Compared with existing technologies, it significantly shortens the construction preparation time, improves construction efficiency, reduces labor intensity, and ensures the hole position accuracy and connection quality of the converter station busbar installation, which represents a significant technological advancement. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0015] Figure 2 This is a partial view of the positioning rod.

[0016] Figure 3 This is a schematic diagram of the positioning plate.

[0017] Reference numerals: 1. Rotary disc, 2. Angle rotation motor, 11. T-slot, 12. Pressure plate, 13. Universal bracket, 131. Universal joint, 3. Spindle bracket, 30. Motor, 31. Handwheel, 32. Positioning rod, 9. Arc surface of the busbar, 33. Copper sliding sleeve, 34. Positioning plate, 8. Drill bit. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0019] like Figures 1-3The diagram shows a schematic of a drilling angle adjustment device for converter station busbar installation provided by this utility model. It includes: an electrically controlled rotary table 1 fixed to the construction surface; the rotary table 1 has an angle rotation motor 2; the surface of the rotary table 1 has multiple T-slots 11; a universal bracket 13, after displacement, is fixed within the T-slots 11 by a pressure plate 12; the other end of the universal bracket 13 is connected to a bench drill type spindle frame 3 via a universal joint 131; the bench drill type spindle frame structure includes a sleeve with a rack inside; and the motor and spindle... The spindle is connected to a drill bit at one end. A motor for driving the drill bit 8 is located inside the spindle frame 3. A handwheel 31 for controlling the displacement of the drill bit 8 is located on the outer surface of the spindle frame 3. On the opposite side of the handwheel 31, two positioning rods 32 parallel to the drill bit 8 are located. One end of each positioning rod 32 abuts against the arc surface 9 of the busbar or the outer surface of the fitting. The other ends of the two positioning rods 32 are fixedly connected to each other. The two positioning rods 32 slide within their respective copper sliding sleeves 33 under external force. The sliding sleeves 33 are fixed to the outer surface of the spindle frame 3. The abutting ends of the two positioning rods 32 are threaded for mounting one or two positioning plates 34. The assembly also includes a telescopic sleeve for auxiliary support, one end of which is fitted onto the central column of the rotary table 1 and extended through a hinge. The other end is connected to the middle of the spindle frame 3 via a universal joint 131. The rotary disk 1 has a circular disc structure. The central column of the rotary disk 1 extends in a direction perpendicular to the disk surface, and the axis of the central column coincides with the geometric center of the rotary disk 1. The universal joint 131 is a spherical universal joint or a cross-shaped universal joint. The two connecting ends of the universal joint 131 are respectively threaded to the universal bracket 13 and the spindle bracket 3. The copper sliding sleeve 33 is cylindrical. The gap between the inner diameter of the copper sliding sleeve 33 and the outer diameter of the positioning rod 32 is 0.1mm to 0.5mm. The positioning rod 32 slides axially within the copper sliding sleeve 33. The T-slots 11 are arranged radially along the rotary disk 1, and multiple T-slots 11 are evenly distributed radially with the geometric center of the rotary disk 1 as the center. The pressure plate 12 is a rectangular plate structure. The pressure plate 12 is bolted through mounting holes and locked into the T-slot 11. The pressure plate 12 presses against the bottom of the universal bracket 13. The outer shell of the spindle frame 3 is a cuboid shell structure. The handwheel 31 is located on one side of the outer shell of the spindle frame 3, and the two positioning rods 32 are located on the opposite side of the outer shell of the spindle frame 3. The positioning plate 34 is a circular or square plate structure. A threaded hole is formed in the center of the positioning plate 34. The positioning plate 34 is screwed onto the threads at the ends of the positioning rods 32 through the threaded hole. The outer surface of the positioning plate 34 is used to abut against the busbar or fittings.

[0020] The core technical principle of this utility model lies in the synergistic effect of a multi-stage angle adjustment mechanism and a dual positioning rod positioning system to achieve precise control and stable positioning of the drilling angle. The rotary table 1, driven by an angle rotation motor 2, can rotate continuously 360 degrees in the horizontal plane, enabling azimuth angle adjustment of the drilling device. The radial distribution design of the T-slot 11 allows the universal bracket 13 to be installed at different radii, adjusting the distance between the drilling point and the rotation center. The universal bracket 13 is fixed in the T-slot 11 by a pressure plate 12, providing radial position locking. The other end of the universal bracket 13 is connected to the spindle frame 3 via a universal joint 131. The multi-degree-of-freedom characteristic of the universal joint 131 allows the spindle frame 3 to adjust its angle in the pitch and yaw directions. Combined with the horizontal rotation of the rotary table 1, this achieves omnidirectional angle positioning capability of the spindle frame 3 in three-dimensional space. Two positioning rods 32 are arranged parallel to the drill bit 8. Their working principle is that before drilling, the positioning rods 32 extend and contact the workpiece surface. Since the positioning rods 32 can slide within the copper sliding sleeve 33, when the ends of both positioning rods 32 simultaneously contact the workpiece surface, they automatically adjust their extension lengths to adapt to the shape of the workpiece surface. At this time, the ends of the two positioning rods 32 form stable two-point or multi-point contact with the workpiece surface, establishing a reliable positioning reference surface. The parallel arrangement of the drill bit 8 and the positioning rods 32 ensures a definite geometric relationship between the axis of the drill bit 8 and the positioning reference surface. When the operator turns the handwheel 31 to push the drill bit 8 forward, the support provided by the positioning rods 32 keeps the spindle support 3 stable, and the drill bit 8 accurately enters the workpiece surface at a predetermined angle, avoiding slippage and deviation of the drill bit 8 at the beginning of drilling. One end of the telescopic sleeve is fitted onto the central column of the rotary table 1, and the other end is connected to the middle of the spindle frame 3 via a universal joint 131, forming a direct support path from the center of the rotary table 1 to the spindle frame 3. This three-point support structure disperses the reaction force and vibration during drilling to the two support points of the rotary table 1 and the telescopic sleeve, significantly improving the system's anti-overturning ability and rigidity, reducing the vibration amplitude of the drill bit 8 during the cutting process, thereby improving the roundness and surface quality of the hole. Through the ingenious design of the mechanical structure, the entire device organically combines the three functions of angle adjustment, position positioning, and stable support, achieving high-precision angle control and stable operation for busbar drilling without relying on complex electrical control systems or sensors.

[0021] The specific operation or use method of this utility model is as follows: First, the rotary table 1 is fixed to a stable surface at the construction site with bolts. The power supply of the angle rotation motor 2 is turned on. According to the installation position of the busbar and the orientation of the drilling point, the angle rotation motor 2 is started to drive the rotary table 1 to rotate, rotating the drilling device to an azimuth angle approximately facing the target drilling position, and then the rotation of the rotary table 1 is stopped. Loosen the fixing bolts on the pressure plate 12, slide the universal bracket 13 along the T-slot 11, and adjust the radial installation position of the universal bracket 13 on the rotary table 1 so that the main spindle frame 3 can approach the target drilling point. After adjustment, tighten the bolts on the pressure plate 12 to lock the universal bracket 13. By adjusting the length of the telescopic sleeve, an effective support connection is established between the telescopic sleeve and the central column of the rotary table 1 and the main spindle frame 3, ensuring that the telescopic sleeve is neither too tight, making angle adjustment difficult, nor too loose, losing its supporting function. Manually adjust the angle of the universal joint 131 to change the spatial posture of the spindle head 3 relative to the universal bracket 13, so that the axis of the drill bit 8 on the spindle head 3 is aligned with the target drilling point and consistent with the required drilling direction. During the adjustment process, the operator uses a level or angle measuring tool to help judge the accuracy of the angle. Push the two positioning rods 32 towards the workpiece so that the ends of the positioning rods 32 or the positioning plates 34 installed at the ends abut against the arc surface 9 of the tube busbar or the outer surface of the hardware. Observe whether both positioning rods 32 are in good contact with the workpiece surface. If the contact is good, it indicates that the angle and position of the spindle head 3 are basically accurate. Start the motor 30 inside the spindle head 3, and the drill bit 8 begins to rotate. The operator slowly turns the handwheel 31 to control the feed of the drill bit 8 towards the workpiece surface. Under the support and guidance of the positioning rods 32, the drill bit 8 smoothly cuts into the workpiece surface and begins drilling. During the drilling process, maintain an appropriate feed speed to avoid overloading the drill bit 8 or damaging the workpiece surface due to excessive feed speed. After drilling is completed, turn the handwheel 31 in the opposite direction to remove the drill bit 8 from the hole position, stop the spindle support 3 motor 30, check the hole quality, and repeat the above adjustment and operation process if drilling is required in other positions.

[0022] The following is a specific embodiment 1 of this utility model: The converter station busbar drilling angle adjustment device provided in this embodiment has a circular turntable base made of gray cast iron HT200 material, with a diameter of 300mm and a thickness of 15mm. The upper surface of the turntable is precision milled to ensure a flatness within 0.02mm. Angle lines are engraved on the surface of the turntable using laser engraving technology. There is one main scale line every 5 degrees and one secondary scale line every 1 degree. The width of the engraving line is 0.1mm and the depth is 0.05mm. Semi-circular positioning grooves are opened at four positions: 0 degrees, 90 degrees, 180 degrees, and 270 degrees. The groove diameter is 6mm and the depth is 3mm. A through hole with a diameter of 130mm is opened in the center of the turntable. The inner wall of the through hole is smooth and burr-free. The through hole has six evenly distributed bolt mounting holes along the circumference. These holes are machined with M10 threads. The bolts are made of 45# steel, 60mm in length, and the ends are machined into a hemispherical shape to avoid damaging the surface of the busbar. The angle adjustment arm is made of Q235 steel plate cut into a fan shape with a central angle of 120 degrees, a radius of 250mm, and a plate thickness of 10mm. A 20mm inner diameter deep groove ball bearing (model 6204) is drilled and installed at the center of the angle adjustment arm. The central shaft is machined from 45# steel, 20mm in diameter, and 80mm in length. The lower end of the central shaft is threaded and fixed to the central shaft hole of the turntable base. The inner ring of the bearing and the central shaft are H7 / k6. The bearing outer ring and the mounting hole of the angle adjusting arm are fitted with an interference fit (H7 / f7 clearance fit). A vernier pointer is welded to the upper surface of the angle adjusting arm 180mm from the center. The vernier pointer is made of stainless steel sheet, 1mm thick and 8mm wide, with the tip ground to a sharp angle for accurate reading. A vertical support column is welded to the edge of the angle adjusting arm furthest from the center. The support column is made of seamless steel pipe, 32mm outer diameter, 3mm wall thickness, and 200mm high. The support column and the angle adjusting arm are welded with a full-circumference fillet weld, with a weld height of 5mm to ensure sufficient connection strength. The drill bit fixing seat is made of aluminum alloy and machined into a box structure with dimensions of 80mm x 80mm x 100mm. A mark is provided on the top of the box. The quick-connect interface is used to mount the electric drill. The interface diameter is 43mm. The housing houses a three-dimensional micro-adjustment mechanism. The front / back, left / right, and up / down adjusting screws are all M8 precision lead screws with a lead of 1mm. Each rotation allows for 1mm of displacement adjustment, with an adjustment range of ±10mm. An adjusting handwheel is connected to the end of the screws for easy operation. The drill bit mounting base is bolted to the top of the vertical support column via a flange. The flange is secured with four M6 bolts. The locking mechanism's arc-shaped rack is made of 45# steel. The rack is 942mm long, corresponding to the entire circumference of the turntable base. The teeth are rectangular with a module of 2mm, a tooth width of 5mm, and a tooth height of 4mm. The rack is fixed to the outer circumference of the turntable base with eight countersunk screws.The ratchet lock's ratchet body is made of 40Cr steel and heat-treated. The ratchet diameter is 40mm, with 20 meshing teeth that engage with the rack. The ratchet is mounted in a mounting bracket at the bottom of the angle adjustment arm via a pin. The handle is made of cold-drawn steel tubing, 150mm long, and connected to the ratchet body via an M8 pin. A torsion spring provides a restoring force between the handle and the ratchet body. Six support feet are welded to the bottom of the turntable base. These feet are made of angle steel, 50mm high, and are distributed every 60 degrees circumferentially. Each support foot has a 30mm diameter, 5mm thick rubber anti-slip pad with a Shore A hardness of 60. The entire device... Weighing approximately 18 kg, it is suitable for single-person handling and operation. The angle adjustment range is 0 to 360 degrees, with an angle reading accuracy of 0.5 degrees. The locking mechanism has a torque resistance greater than 50 Nm, capable of withstanding various loads generated during conventional drilling operations. In use, a suitable busbar with an outer diameter ranging from 100 mm to 125 mm is inserted into the central through hole of the turntable base. Radial clamping force is applied using the clamping bolts for fixation. The angle adjustment arm is adjusted and locked according to the drilling angle requirements. After installing the drilling equipment, drilling operations can commence. This device features a simple and reliable structure, convenient and quick operation, and can significantly improve the accuracy and efficiency of busbar drilling operations.

[0023] The following is a specific embodiment 1 of this utility model: In this embodiment, the rotary disk 1 is made of Q235 steel, with a diameter of 600mm and a thickness of 15mm. The surface is treated with phosphate and powder coating to improve corrosion resistance. A hollow cylindrical central column with a height of 200mm and a diameter of 50mm is welded to the center of the rotary disk 1. The central column is also made of Q235 steel. Six T-slots 11 are radially formed on the surface of the rotary disk 1. The groove width of the T-slots 11 is 12mm and the groove depth is 8mm. The T-slots 11 are evenly distributed with the geometric center of the rotary disk 1 as the center, and the included angle between two adjacent T-slots 11 is 60 degrees. The angle rotation motor 2 is a 120W stepper motor. The motor 2 drives the rotary disk 1 to rotate through a reducer with a reduction ratio of 50:1, which can achieve precise angle control. The universal bracket 13 is made of a 300mm long rectangular steel tube with a cross-sectional dimension of 40mm × 60mm and a wall thickness of 3mm. One end of the universal bracket 13 is welded to a base plate, which is fixed to a T-slot 11 by two rectangular pressure plates 12 and M10 bolts. The pressure plates 12 are 80mm × 40mm × 5mm in size and made of 45# steel. The other end of the universal bracket 13 is connected to the spindle frame 3 via a 25mm diameter cross-shaft universal joint 131. Both ends of the universal joint 131 are connected to the universal bracket 13 and the spindle frame 3 using M16 threads. The spindle frame 3 adopts a standard bench drill type structure with a cast iron outer shell, and overall dimensions of 350mm × 200mm × 180mm. It houses a 550W three-phase asynchronous motor 30 with a speed of 2800 rpm, which drives the spindle rotation via a gear transmission mechanism. The spindle diameter is 13mm, the maximum drilling diameter is 16mm, and the handwheel 31 has a diameter of 120mm. The handwheel 31 controls the axial feed of the spindle via a rack and pinion mechanism, with a feed stroke of 80mm. The two positioning rods 32 are made of 12mm diameter round steel, made of 40Cr alloy steel, and their surfaces are hardened and chrome-plated to improve hardness and wear resistance. The positioning rods 32 are 250mm long, with M10 threads machined within a 20mm length at their ends. The copper sliding sleeve 33 is made of ZCuSn10P1 tin bronze, with an outer diameter of 18mm, an inner diameter of 12.2mm, and a length of 30mm. The sliding sleeve 33 is fixed to the side of the spindle bracket 3 housing via a threaded connection. The fixed ends of the two positioning rods 32 are connected to each other by a rigid connecting rod made of 10mm diameter round steel, 100mm long, ensuring that the two positioning rods 32 remain parallel and spaced 90mm apart. The positioning plate 34 is available in two types: round and square. The round positioning plate 34 has a diameter of 30mm and a thickness of 5mm, while the square positioning plate 34 has a side length of 28mm and a thickness of 5mm. Both positioning plates 34 are made of Q235 steel and have an M10 threaded hole in the center.The telescopic sleeve consists of an outer tube and an inner tube. The outer tube is 400mm long and has an inner diameter of 52mm, while the inner tube is 450mm long and has an outer diameter of 50mm. The fit clearance between the inner and outer tubes is 1mm, allowing the inner tube to slide freely within the outer tube. The total telescopic range of the telescopic sleeve is 350mm. The lower end of the outer tube of the telescopic sleeve is fitted onto the central column of the rotary disc 1 and secured by a positioning screw on the side. A 200mm long hinge arm is connected to the side of the outer tube of the telescopic sleeve via a hinge shaft 100mm from the lower end. The other end of the hinge arm is connected to the middle of the main shaft bracket 3 housing via a ball joint 131. When using this device, the operator first adjusts the angle of the rotary table 1 and the position of the universal bracket 13 in the T-slot 11 according to the position of the busbar. Then, the operator adjusts the universal joint 131 and the telescopic sleeve to make the main shaft frame 3 reach the required angle. After the two positioning rods 32 abut against the surface of the busbar, the operator starts the motor 30 of the main shaft frame 3 and rotates the handwheel 31 to perform drilling operations. The whole operation process is simple and smooth, with high drilling accuracy and the hole position deviation can be controlled within 0.5mm, which meets the technical requirements for the installation of the converter station busbar.

[0024] The following is another specific embodiment 2 of this utility model: This embodiment 2 is based on embodiment 1, and the structure of the positioning rod 32 is improved by adding a spring buffer mechanism to the abutting ends of the two positioning rods 32. Specifically, a blind hole with a diameter of 8mm and a depth of 15mm is machined inside the threaded section at the end of the positioning rod 32. A compression spring is installed in the blind hole, with one end of the spring abutting the bottom of the blind hole and the other end pressing against the back of the positioning plate 34. When the positioning plate 34 is screwed into the end of the positioning rod 32, it compresses the spring to generate a preload. When the positioning rod 32 abuts against the workpiece surface, the elasticity of the spring can compensate for minor undulations and shape errors on the workpiece surface, ensuring that the positioning plate 34 always maintains stable contact with the workpiece surface and avoiding positioning instability caused by uneven workpiece surfaces. The spring is a stainless steel compression spring with a wire diameter of 1.2mm, an outer diameter of 7.5mm, and a free length of 20mm. The spring stiffness is 0.5N per millimeter, providing a moderate buffering effect without being too soft and affecting positioning accuracy. This improvement reduces the requirements for workpiece surface quality, expands the applicability of the device, and is particularly suitable for use when there is slight deformation on the surface of the busbar or the surface of the fittings is not flat enough, further improving the reliability of positioning and the quality of drilling.

[0025] The following is another specific embodiment 3 of this utility model: Embodiment 3 is based on Embodiment 1, with optimization and improvement of the T-slot 11 layout of the rotary table 1. The number of T-slots 11 is increased to 8, and the included angle between adjacent T-slots 11 is reduced to 45 degrees. Simultaneously, a scale line is marked every 50mm radially within each T-slot 11, and the scale line is formed by laser engraving to create a groove with a depth of 0.3mm. This improvement allows for more flexible selection of the installation position of the universal bracket 13 on the surface of the rotary table 1, with higher angular resolution, enabling more precise alignment with drilling positions in different directions. The scale lines within the T-slots 11 provide operators with an intuitive positional reference, facilitating quick adjustment of the universal bracket 13 to the desired radial position and reducing the number of repeated trials and adjustments. A limiting boss with a height of 3mm is also added at the beginning and end of each T-slot 11 to prevent the pressure plate 12 and the universal bracket 13 from slipping out of the slot during operation, thus improving operational safety. Meanwhile, the thickness of the rotary table 1 was increased to 20mm, enhancing its rigidity and load-bearing capacity, enabling the device to adapt to higher power drilling operations. These improvements significantly enhanced the device's adjustment accuracy and operability, making it more suitable for batch drilling operations under complex conditions in large converter stations, thereby improving construction efficiency and consistency of work quality.

Claims

1. A converter station busbar borehole angle adjustment device, characterized in that, include: An electrically controlled rotary table is fixed to the construction surface. The rotary table has an angle rotation motor. The surface of the rotary table has multiple T-slots. A universal bracket is fixed in the T-slots by a pressure plate after displacement. The other end of the universal bracket is connected to a bench drill spindle frame via a universal joint. The spindle frame contains a motor. The outer surface of the spindle frame has a handwheel for controlling the displacement of the drill bit. On the opposite side of the handwheel, there are two positioning rods parallel to the drill bit. One end of the two positioning rods is used to abut against the arc surface of the busbar or the outer surface of the fitting. The other ends of the two positioning rods are fixedly connected to each other. The two positioning rods slide within their respective copper sliding sleeves under external force. The copper sliding sleeves are fixed to the outer surface of the spindle frame.

2. The apparatus according to claim 1, characterized in that, The ends of the two positioning rods that are used for abutment are threaded for mounting one or two positioning plates.

3. The apparatus according to claim 2, characterized in that, It also includes a telescopic sleeve that provides auxiliary support, one end of which is fitted onto the central column of the rotary table and extended through a hinge, while the other end is connected to the middle of the main shaft frame through a universal joint.

4. The apparatus according to claim 3, characterized in that... The rotary disk has a circular disc structure, and the central column of the rotary disk extends in a direction perpendicular to the disk surface. The axis of the central column coincides with the geometric center of the rotary disk.

5. The apparatus according to claim 4, characterized in that... The universal joint is a ball joint or a cross joint, and the two connecting ends of the universal joint are respectively connected to the universal bracket and the spindle frame by threads.

6. The apparatus according to claim 5, characterized in that... The copper sliding sleeve is cylindrical, and the gap between the inner diameter of the copper sliding sleeve and the outer diameter of the positioning rod is 0.1mm to 0.5mm. The positioning rod slides axially within the copper sliding sleeve.

7. The apparatus according to claim 6, characterized in that... The T-slots are arranged along the radial direction of the rotary disk, and the plurality of T-slots are evenly distributed radially with the geometric center of the rotary disk as the center.

8. The apparatus according to claim 7, characterized in that... The pressure plate is a rectangular plate structure. The pressure plate is locked in the T-slot by bolts passing through the mounting holes on the pressure plate. The pressure plate is pressed against the bottom of the universal bracket.

9. The apparatus according to claim 8, characterized in that... The outer shell of the spindle frame is a cuboid shell structure. The handwheel is located on one side of the outer shell of the spindle frame, and the two positioning rods are located on the opposite side of the outer shell of the spindle frame.

10. The apparatus according to claim 9, characterized in that... The positioning plate is a circular or square plate structure. A threaded hole is provided in the center of the positioning plate. The positioning plate is screwed onto the thread at the end of the positioning rod through the threaded hole. The outer surface of the positioning plate is used to abut against the busbar or hardware.

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