A transformer oil tank positioning pin marking device

Abstract

The utility model belongs to transformer manufacturing technical field, concretely is a kind of transformer oil tank positioning pin punch device, including punch pin, the punch pin includes stem portion and the marking tip at the bottom end of stem portion, further include the positioning sleeve for guiding fixed punch pin, the positioning sleeve is the barrel that the guide hole for guiding punch pin is set in middle, the positioning sleeve outer surface is equipped with several observation gap for observing oil tank surface positioning pin marking line, the barrel is composed of the taper portion in upper portion and the straight cylinder portion in lower portion, the observation gap is located in straight cylinder portion, positioning sleeve with guide hole and observation gap are provided, punch pin is provided with stable mechanical guide and visual alignment reference, so that punch process no longer depends on the experience and visual observation of operator, greatly improves the positioning accuracy and consistency of sample punching eye.

Description

Technical Field

[0001] This utility model relates to the field of transformer processing technology, specifically a transformer tank positioning pin prototyping device. Background Technology

[0002] In the field of transformer manufacturing, especially in the production of large and medium-sized oil-immersed transformers, locating pins are key components that ensure precise assembly between the tank and related parts (such as the transformer body). These locating pins, through their mating locating holes, enable the quick and accurate positioning and installation of components, significantly improving the convenience and reliability of assembly. Therefore, the manufacturing process of the tank places extremely high demands on the dimensional accuracy of the locating pins welded to it.

[0003] Currently, the traditional welding process for locating pins in the industry generally relies on manual marking and visual alignment. Specifically, operators must first draw a circle on the tank plate that is the same size as the end face of the locating pin. Then, based on experience and visual observation, they place the locating pin so that it coincides with the drawn circle before welding. The disadvantage of this method is that it has poor dimensional accuracy, and the entire process is greatly affected by the subjective skill level and operating condition of the employees, resulting in poor consistency in the welding position of the pins, which in turn affects the assembly quality of the subsequent transformer.

[0004] To overcome the shortcomings of traditional processes, the industry has explored various positioning methods. For example, a patent (CN103515059A) relates to a centering device for unequal-diameter holes in transformer tanks. This device uses stepped pins of different diameters to align the holes, which solves the alignment problem to some extent. However, it is mainly used for aligning holes between the tank cover and the tank edge, and does not address the precise positioning of the positioning pins during the initial welding of the tank plates. Furthermore, the structure is relatively complex.

[0005] Another, more recent patent (CN220138057U) provides a transformer positioning pin installation structure, which uses nylon bolts to pre-fix insulating cardboard onto the positioning pins, forming a single unit before lowering the transformer body to facilitate installation. This solution focuses on the assembly process between the positioning pins and the transformer body, but does not address the initial accuracy and efficiency issues when welding the positioning pins to the oil tank. Utility Model Content

[0006] To improve the initial accuracy and efficiency of welding positioning pins, this utility model provides a transformer tank positioning pin prototyping device, including a prototyping pin. The prototyping pin includes a rod and a marking tip located at the bottom of the rod. It also includes a positioning sleeve for guiding and fixing the prototyping pin. The positioning sleeve is a cylindrical body with a guide hole in the middle for guiding the prototyping pin. The outer surface of the positioning sleeve is provided with several observation notches for observing the positioning pin markings on the surface of the tank.

[0007] Preferably, the cylindrical body consists of an upper conical portion and a lower straight cylindrical portion, with the observation notch located in the straight cylindrical portion.

[0008] Preferably, the upper edge of the guide hole is provided with a chamfer to avoid obstruction.

[0009] Preferably, the core of the cylinder is composed of an upper bushing and a lower bushing that are threaded together, and the core of the upper bushing and the lower bushing are provided with a guide hole.

[0010] Preferably, the mating surfaces of the upper and lower bushings are provided with a central clearance portion.

[0011] Preferably, the observation notch has a circumferential cone-shaped surface, which makes the observation notch a tapered notch that is smaller at the bottom and larger at the top.

[0012] Preferably, the bottom of the lower bushing is provided with a central clearance portion, and after the upper bushing and the lower bushing are fully threaded together, the central clearance portion is lower than the lower end face of the cylinder.

[0013] Compared with the prior art, this utility model provides a transformer tank positioning pin prototyping device, which has the following advantages: The device features a positioning sleeve with guide holes and an observation notch, providing stable mechanical guidance and visual alignment for the prototyping pins. This eliminates reliance on operator experience and visual inspection during the prototyping process, significantly improving the positioning accuracy and consistency of the punched holes. It fundamentally reduces quality fluctuations caused by human factors, laying a reliable foundation for precise welding of the subsequent positioning pins. Secondly, the device significantly improves operational efficiency, eliminating the tedious steps of manually drawing circles and repeatedly aiming at the center in traditional processes. Operators only need to place the positioning sleeve at the intersection of the markings and confirm the position by observing the notch before directly prototyping, simplifying the process and expected to increase the overall positioning and welding efficiency of the positioning pins by approximately 50%. Furthermore, the device's structural design fully considers practicality and economy. The modular bushing design allows it to adapt to prototyping pins of different specifications, offering strong versatility and easy maintenance. Details such as chamfered guide holes and recessed avoidance parts reduce component wear and extend service life. The entire solution cleverly utilizes the existing pin end face sharpness from turning, achieving a leap in process quality without incurring additional processing costs, making it highly suitable for widespread application in the transformer manufacturing industry. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a top view of the positioning sleeve of this utility model; Figure 3 This is a cross-sectional view of the present invention.

[0015] In the diagram: 1. Positioning sleeve; 101. Cylinder body; 102. Guide hole; 103. Observation notch; 104. Conical part; 105. Straight cylinder part; 106. Upper bushing; 107. Alignment chamfer; 108. Lower bushing; 109. Concave alignment part; 110. Middle alignment part; 111. Cut conical surface; 2. Sample pin; 201. Rod part; 202. Marking tip. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Example The following is combined Figures 1 to 3 The specific embodiments of this utility model will be described in further detail below. It should be noted that the implementation of this utility model is not limited to the following description, but all other embodiments obtained by those skilled in the art based on the technical solution of this utility model without creative effort should fall within the protection scope of this utility model.

[0018] A transducer tank positioning pin prototyping device is used to quickly and accurately punch prototyping holes on the tank plate to match the conical tip of the positioning pin end face, thereby achieving precise welding of the positioning pin.

[0019] like Figure 1 As shown, the device includes a sample-making pin 2 and a positioning sleeve 1. The sample-making pin 2 includes a rod portion 201 and a marking tip 202 located at the bottom end of the rod portion 201. The marking tip 202 is conical, and its size matches the small tip of the end face of the positioning pin, and is used to tap out a sample punch on the surface of the oil tank.

[0020] The positioning sleeve 1 is a cylindrical body 101 with a guide hole 102 in the middle. The guide hole 102 is used to guide the prototyping pin 2 to ensure that the prototyping pin 2 moves in the vertical direction and avoids deviation. The outer surface of the positioning sleeve 1 is provided with several observation notches 103. These observation notches 103 are evenly distributed in the circumference, allowing the operator to directly observe the positioning pin markings (such as dimension lines drawn with a pen) on the surface of the tank during the prototyping process, so as to accurately align the prototyping position.

[0021] The cylindrical body 101 of the positioning sleeve 1 consists of a conical portion 104 at the top and a straight cylindrical portion 105 at the bottom. The design of the conical portion 104 helps to expand the operator's field of vision, while the straight cylindrical portion 105 is easy to process and hold. The observation notch 103 is located in the straight cylindrical portion 105.

[0022] To reduce friction between the prototyping pin 2 and the upper edge of the guide hole 102 during movement, the upper edge of the guide hole 102 is provided with a chamfer 107.

[0023] In another embodiment, the core of the positioning sleeve 1's cylindrical body 101 adopts a combined structure, consisting of an upper bushing 106 and a lower bushing 108 that are threaded together. The cores of the upper bushing 106 and the lower bushing 108 share a guide hole 102. This design allows the device to accommodate sample pins 2 of different sizes; only the corresponding bushing needs to be replaced, improving versatility and maintainability. The mating surfaces of the upper bushing 106 and the lower bushing 108 are provided with a central clearance portion 110, which reduces wear on the sample pin 2 at the joint between the upper bushing 106 and the lower bushing 108, extending their service life.

[0024] Furthermore, the observation notch 103 has a circumferentially shaped conical surface 111, making it a tapered notch that is smaller at the bottom and larger at the top. This further expands the field of view, making it easier for the operator to observe the markings from different angles.

[0025] In addition, the bottom of the lower bushing 108 is provided with a central clearance portion 110. When the upper bushing 106 and the lower bushing 108 are fully threaded together, the central clearance portion 110 is lower than the lower end face of the cylinder 101, which increases the reliability of the fit between the upper bushing 106 and the lower bushing 108 and prevents them from loosening due to vibration during operation.

[0026] The operating steps for using this device are as follows: According to the drawings, use a stone pencil and a steel ruler to draw the dimension lines of the locating pins on the fuel tank panel.

[0027] Place the positioning sleeve 1 at the intersection of the dimension lines and align the notch 103 with the marking line by observation.

[0028] Insert the prototyping pin 2 into the guide hole 102 and strike the top of the prototyping pin with a hammer so that the marking tip 202 punches a prototyping hole of approximately Φ2.5*45° on the surface of the oil tank.

[0029] Remove the device and align the small tip (Φ2*45°) on the end face of the locating pin with the punch hole to ensure that the end face of the locating pin is in close contact with the surface of the oil tank.

[0030] Use a welding gun to spot weld the positioning pins, and then weld them after confirming that the dimensions are correct.

[0031] This device has a simple structure and is easy to operate. By combining mechanical guidance and visual alignment, it ensures the positioning accuracy of the punch eye and significantly improves the welding efficiency and quality of the positioning pins.

[0032] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A transformer tank positioning pin prototyping device, comprising a prototyping pin (2), wherein the prototyping pin (2) comprises a rod (201) and a marking tip (202) located at the bottom end of the rod (201), characterized in that: It also includes a positioning sleeve (1) for guiding and fixing the sample pin (2). The positioning sleeve (1) is a cylindrical body (101) with a guide hole (102) in the middle for guiding the sample pin (2). The outer surface of the positioning sleeve (1) is provided with several observation notches (103) for observing the positioning pin markings on the surface of the oil tank.

2. The transformer tank positioning pin prototyping device according to claim 1, characterized in that: The cylindrical body (101) consists of a conical part (104) at the top and a straight cylindrical part (105) at the bottom, and the observation notch (103) is located in the straight cylindrical part (105).

3. The transformer tank positioning pin prototyping device according to claim 1, characterized in that: The upper edge of the guide hole (102) is provided with a chamfer (107).

4. The transformer tank positioning pin prototyping device according to claim 1, characterized in that: The core of the cylinder (101) is composed of an upper bushing (106) and a lower bushing (108) that are threaded together. The core of the upper bushing (106) and the lower bushing (108) are provided with a guide hole (102).

5. The transformer tank positioning pin prototyping device according to claim 4, characterized in that: The mating surfaces of the upper bushing (106) and the lower bushing (108) are provided with a central recessed clearance portion (109).

6. The transformer tank positioning pin prototyping device according to claim 1, characterized in that: The observation notch (103) has a circumferentially provided cutting cone surface (111), which makes the observation notch (103) a cone-shaped notch with a smaller bottom and a larger top.

7. The transformer tank positioning pin prototyping device according to claim 4, characterized in that: The bottom of the lower bushing (108) is provided with a central concave relief part (109). After the upper bushing (106) and the lower bushing (108) are fully threaded together, the central concave relief part (109) is lower than the lower end face of the cylinder (101).

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