Transformer oil tank welding tool

Abstract

The utility model discloses a kind of transformer oil tank welding tool, belong to oil tank production technical field, including pedestal and clamping assembly. Clamping assembly includes first guide slot, pressing plate, first screw rod and nut, first screw rod one end mobilely penetrates pressing plate and has the freedom of linear movement along first guide slot, nut is threadedly connected with the other end of first screw rod. Multiple clamping assemblies are arranged on pedestal. Clamping assembly is slid under the constraint of guide slot along guide direction, so as to adjust the clamping position of different oil tank. When operating, by screwing nut, screw rod drives pressing plate to generate downward pressure, and wallboard or oil tank bottom epitaxial plate can be reliably fixed on tool. The distribution of multiple clamping assemblies makes tool form stable clamping system under multi-point support, completely eliminates the freedom of wallboard or oil tank, realizes the quick positioning and stable clamping of different size, different structure oil tank, strong compatibility, improves the clamping efficiency and accuracy of welding process.

Description

Technical Field

[0001] This utility model belongs to the field of oil tank production technology, specifically a welding fixture for transformer oil tanks. Background Technology

[0002] Wind power equipment and rail locomotives are generally equipped with independent oil tank systems to store lubricating oil or hydraulic oil to meet the needs of lubrication, cooling, and hydraulic control during equipment operation. With the increasing number of equipment models and power ratings, the specifications, shapes, and capacities of oil tanks are also becoming more diverse. Different models of oil tanks differ significantly in structural dimensions, installation locations, and internal structures, resulting in a wide variety of oil tank types and making it impossible to use standardized welding fixtures and tooling equipment in production.

[0003] Existing fuel tank welding processes are generally divided into wall panel welding and tank body welding. Wall panels are typically long, strip-shaped plates, characterized by their considerable length and relatively thin thickness, making them prone to deformation and warping during welding. The tank body, on the other hand, is mostly a three-dimensional structure, characterized by its greater height and strong spatial enclosure, requiring multi-angle and multi-directional positioning and support during welding. Due to the significant differences in the geometric characteristics of the wall panels and the tank body, existing welding fixtures are often incompatible with fuel tanks of different structures. Typically, a dedicated fixture needs to be designed for each model, resulting in long production cycles, high manufacturing costs, and frequent adjustments required when changing fixtures, impacting production efficiency.

[0004] Patent CN117697266A discloses a welding device for processing automotive fuel tanks, which has a support mechanism for fixing the fuel tank. The support mechanism includes a support plate, a guide groove, and four clamping plates. The guide groove is located on the top of the support plate, and the bottoms of the four clamping plates are slidably connected to the inner wall of the guide groove. Each of the four clamping plates has a threaded fixing bolt on its top. One end of the fixing bolt protrudes from the clamping plate and abuts against the bottom of the guide groove, thus securing the clamping plate firmly to the inner wall of the guide groove.

[0005] The above-mentioned fixing method allows for adjustment of the clamping range of the clamping plates according to the dimensions of the fuel tank's reference surface. However, in some working conditions, to facilitate the welding robot finding a suitable angle for welding operations, a cradle turntable is used to carry the welding fixture and the entire fuel tank for rotation, avoiding the need for secondary loading and unloading and fixing of the fuel tank. Due to the large height of the fuel tank, the center of gravity shifts significantly outward when the tank rotates, making this fixing method prone to causing the fuel tank to slip out of the clamping force and tip over. Utility Model Content

[0006] The purpose of this utility model is to provide a welding fixture for transformer oil tanks to solve the problems mentioned in the prior art.

[0007] A welding fixture for a transformer tank is provided, comprising: Base; The clamping assembly includes a first guide groove, a pressure plate, a first screw, and a nut. One end of the first screw passes through the pressure plate and has the freedom to move linearly along the first guide groove. The nut is threadedly connected to the other end of the first screw. Multiple clamping components are disposed on the base.

[0008] As a further aspect of this invention: the first screw only has the degree of freedom to move linearly along the first guide groove.

[0009] By limiting the screw's movement path through structural design, the screw can only translate along the guide groove direction and cannot rotate or deviate. This ensures that the clamping force of the pressure plate always acts in a fixed direction, avoiding situations where the screw tilts or rotates, causing bias pressure or separation from the contact surface, and improving the positioning stability during welding.

[0010] As a further embodiment of this utility model, a washer is provided between the nut and the pressure plate.

[0011] As a buffer medium, the gasket disperses local loads during nut tightening and compensates for minor displacements caused by manufacturing errors or thermal expansion. It prevents the pressure plate surface from being hard-pressed by the nut, reducing clamping friction and wear; it also improves the smoothness and durability of clamping contact, helping to maintain long-term accuracy.

[0012] As a further embodiment of this utility model: the pressure plate is provided with a second guide groove along its length, and the first screw moves through the second guide groove.

[0013] The second guide groove allows the pressure plate to be repositioned relative to the screw, changing its posture and thus fine-tuning the clamping point of the pressure plate while keeping the screw's own position unchanged. This improves the tooling's adaptability to different local geometries of oil tanks, enabling more flexible clamping methods and further increasing the clamping range of the pressure plate.

[0014] As a further embodiment of this utility model: a frame is provided between the base and the clamping components, and the frame has flanges extending outward away from each clamping component.

[0015] The frame increases the load-bearing surface through the flanges, providing support for the long strip wall panels and preventing deformation caused by excessive cantilever length. The flanges can also serve as load-bearing bodies for clamping components, expanding the clamping points without significantly increasing the weight of the tooling.

[0016] As a further embodiment of this utility model: a pad is provided between the clamping assembly and the frame, and a plurality of first guide grooves are sequentially formed on the pad along the flange extension direction.

[0017] The clamping components can be flexibly distributed in different first guide slots, improving the flexibility of clamping point arrangement and enabling the tooling to adapt to different sizes of long strip panels or wide boxes.

[0018] As a further embodiment of this utility model, the base is provided with an interface that cooperates with the cradle turntable.

[0019] The interface structure connects to the cradle turntable, allowing the entire fixture to be adjusted in angle or rotated as a whole during the welding process. The welding robot or operator can adjust the tank's posture via the turntable, improving weld accessibility and welding quality, while avoiding positioning errors caused by secondary clamping of the tank.

[0020] As a further embodiment of this invention, it also includes a support arm extending in the height direction and an actuator end that can contact the fuel tank.

[0021] The support assembly provides anti-tipping force to the fuel tank through support arms and actuators. The actuators contact the fuel tank to prevent it from sagging or tilting. It accommodates the welding support requirements of large-diameter fuel tanks, preventing excessive shift of the tank's center of gravity towards the support points that could lead to overturning.

[0022] As a further embodiment of this invention: the actuating end includes a second screw, which is threadedly connected to the support arm.

[0023] By rotating the second screw to adjust the distance between the actuator and the oil tank, it can adapt to the support requirements of oil tanks of different widths.

[0024] As a further embodiment of this utility model, the execution end also includes tightening heads and pressure plates respectively disposed at both ends of the second screw.

[0025] The tightening head makes it easy to tighten manually or with tools, and the pressure plate contacts the oil tank to form a uniform support surface, preventing scratches or deformation caused by point contact.

[0026] Compared with the prior art, the beneficial effects of this utility model are as follows: The clamping components can slide along the guide direction under the constraint of the guide groove, thereby adjusting the clamping position of different oil tanks. During operation, tightening the nut causes the screw to drive the pressure plate to generate a downward clamping force, reliably fixing the wall panel or the bottom extension plate of the oil tank to the tooling. The distribution of multiple clamping components allows the tooling to form a stable clamping system under multi-point support, completely eliminating the degree of freedom of the wall panel or oil tank, realizing rapid positioning and stable clamping of oil tanks of different sizes and structures, with strong compatibility, improving the clamping efficiency and accuracy of the welding process. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this drawing or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this drawing. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0028] Figure 1 A schematic diagram of the overall structure of the welding fixture for a transformer oil tank; Figure 2 for Figure 1 Enlarged view of region A in the middle; Figure 3 This is a diagram showing the working state of the welding fixture for the transformer oil tank.

[0029] In the diagram: 1. Base; 11. Interface; 2. Clamping assembly; 21. First guide groove; 22. Pressure plate; 221. Second guide groove; 23. First screw; 24. Nut; 25. Washer; 3. Frame; 31. Flange; 4. Pad; 51. Support arm; 52. Actuating end; 521. Second screw; 522. Tightening head; 523. Pressure plate. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this application clearer, the application is described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection of this application.

[0031] Obviously, the accompanying drawings described below are merely some examples or embodiments of this application. Those skilled in the art can apply this application to other similar scenarios based on these drawings without any inventive effort. Furthermore, it is understood that although the efforts made in this development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this application, any changes to design, manufacturing, or production based on the technical content disclosed in this application are merely conventional technical means and should not be construed as insufficient disclosure of the content of this application.

[0032] However, there may be instances where unnecessary detailed descriptions are omitted. For example, detailed descriptions of well-known matters or repetitive descriptions of essentially the same structures may be omitted. This is to avoid unnecessarily lengthy descriptions and to facilitate understanding by those skilled in the art. Furthermore, the accompanying drawings and the following description are provided to enable those skilled in the art to fully understand this application and are not intended to limit the subject matter of the claims.

[0033] Please see Figures 1-3 As shown in the embodiment of this utility model, a transformer tank welding fixture includes a base 1 and a clamping assembly 2. The clamping assembly 2 includes a first guide groove 21, a pressure plate 22, a first screw 23, and a nut 24. One end of the first screw 23 movably passes through the pressure plate 22 and has the freedom to move linearly along the first guide groove 21. The nut 24 is threadedly connected to the other end of the first screw 23. Multiple clamping assemblies 2 are disposed on the base 1.

[0034] When using this transformer tank welding fixture, the tank wall panel or bottom extension plate to be welded is first placed on the base 1, so that the part to be welded is within the clamping range of multiple clamping components 2. Each clamping component 2 is set on the base 1, and the first guide groove 21 inside extends along the design direction of the fixture. During clamping and positioning, the operator can slide the first screw 23 along the direction of the first guide groove 21 according to the specific size and shape of the tank, thereby driving the pressure plate 22 to move synchronously, realizing flexible adjustment of the clamping components 2 between different positions. When the pressure plate 22 moves to the position corresponding to the part of the tank to be clamped, the nut 24 is tightened, so that the nut 24 is pushed along the thread direction of the first screw 23. During the tightening of the nut 24, the axial thrust between the threaded pairs is converted into a downward clamping force on the pressure plate 22. After the pressure plate 22 is subjected to this force, its lower surface contacts the tank wall panel or bottom extension plate, forming a stable clamping surface.

[0035] As multiple clamping components 2 sequentially tighten the nuts 24, the tooling forms a multi-point clamping system. The clamping force between each clamping component 2 is transmitted through the base 1, forming an overall rigid constraint structure. As a result, the displacement degrees of freedom of the oil tank in the X, Y, and Z directions are eliminated, while the rotational degrees of freedom are also restricted, achieving complete positioning of the oil tank during the welding process.

[0036] In one embodiment, the front end of the first screw 23 has a limiting block that forms with the first guide groove 21 to constrain the rotational degree of freedom of the first screw 23. This limiting block also constrains the axial degree of freedom of the first screw 23, ensuring that the first screw 23 only has the degree of freedom to move linearly along the guide channel of the first guide groove 21. This prevents the first screw 23 from rotating relative to the first guide groove 21 due to tooling vibration during the clamping process of the oil tank, thus avoiding loosening of the contact and improving clamping stability.

[0037] In this transformer tank welding fixture, nut 24 is used to apply axial preload to the first screw 23, thereby driving the pressure plate 22 to clamp the tank wall panel or outer extension plate. However, in the actual clamping process, there is a rigid contact surface between nut 24 and pressure plate 22. When the operator tightens nut 24, the axial thrust transmitted by the threaded pair will be concentrated at the contact point, forming a large local stress concentration. If used under high-strength clamping or repeated tightening conditions for a long time, the surface of pressure plate 22 is prone to indentation, wear or metal fatigue deformation, thus affecting the stability of the clamping force and the service life. Therefore, a washer 25 is provided between nut 24 and pressure plate 22. When nut 24 is tightened, the concentrated axial load generated by the bottom surface of nut 24 is first transmitted to washer 25. The flat surface of washer 25 distributes the load to pressure plate 22 over a large area, thereby reducing the contact stress per unit area and avoiding local plastic deformation on the surface of pressure plate 22.

[0038] The pressure plate 22 has a second guide groove 221 along its length, through which the first screw 23 movably passes. Because the second guide groove 221 extends along the length of the pressure plate 22, the first screw 23 can move linearly within the range of the second guide groove 221, thereby changing the position of the pressure plate 22 relative to the first screw 23. Even after the first screw 23 is fixed in its set position, the posture of the pressure plate 22 can still be finely adjusted (e.g., by rotation) under the constraint of the second guide groove 221, flexibly changing the position of the clamping point in contact with the fuel tank, achieving more precise local positioning. Furthermore, the presence of the second guide groove 221 means that the clamping range of the pressure plate 22 is no longer limited to the fixed point of the first screw 23. The length of the second guide groove 221 effectively expands the effective clamping area of ​​the pressure plate 22, enabling it to cover larger or more complex fuel tank structural parts.

[0039] During the welding of the fuel tank, the wall panels are mostly slender, thin plate structures, with their length much greater than their thickness. If directly supported by the base 1, the stress area is small, and the edges of the wall panels will be in a cantilevered state, easily sagging or twisting due to their own weight or welding heat deformation, thus affecting the welding positioning accuracy. The frame 3 is set between the base 1 and the clamping assembly 2, which is equivalent to forming an intermediate load-bearing layer. The flange 31 extending outward from the frame 3 allows the clamping force, which was originally concentrated on the base 1, to be distributed along the direction of the flange 31, thereby expanding the effective load-bearing surface of the tooling. When the wall panels are placed on the tooling, they can be supported over a larger area, significantly reducing the cantilever length.

[0040] A pad 4 is provided between the clamping assembly 2 and the frame 3, and multiple first guide grooves 21 are sequentially formed on the pad 4 along the extension direction of the flange 31. The flange 31 serves as the mounting surface for the clamping assembly 2. Without changing the structure of the base 1, the pad 4 provides more mounting positions or sliding guide groove areas, allowing multiple clamping assemblies 2 to be arranged along the flange 31 to further expand the clamping point distribution range, or to replace the position of a clamping assembly 2 among the first guide grooves 21, thereby improving the arrangement flexibility.

[0041] In one specific embodiment, the frame 3 and flange 31 adopt a cavity or profile structure, which can increase the overall rigidity without significantly increasing the weight of the tooling, thereby maintaining structural strength while taking into account operational flexibility and ease of handling.

[0042] The base 1 is equipped with an interface 11 that mates with the cradle turntable. The connection design between the interface 11 and the cradle turntable allows the welding fixture to have adjustable posture and flip-over characteristics. Specifically, the interface 11, as the connection interface between the fixture and the cradle turntable, typically uses a flange, locating pin, or quick-change locking mechanism to ensure that the two form a highly rigid whole after connection. This allows the rotational torque and angle adjustment of the turntable to be accurately transmitted to the fixture body, achieving synchronous changes in the overall posture of the oil tank.

[0043] The cradle turntable can flip or rotate around a fixed axis. When the tooling is connected to the cradle turntable, the oil tank can adjust its angle with the turntable's movement, allowing operators or welding robots to perform welds from the optimal position. This function significantly improves weld accessibility and avoids poor weld formation due to limited space or improper angles.

[0044] When the fuel tank is a tall, vertical, or large structure, its center of gravity is high and unevenly distributed. Slight deformation during welding heating or clamping can easily cause the center of gravity to shift. The welding fixture also includes a support arm 51 extending in the height direction and an actuator end 52 that can contact the fuel tank. The support arm 51, as a structural unit connecting the main body of the fixture and the actuator end 52, forms a lever arm structure in space. By appropriately adjusting the length, angle, or installation position of the support arm 51, support points can be set at different parts of the fuel tank, thereby achieving directional support for the outer wall of the fuel tank and forming a three-dimensional anti-overturning support system. By setting support points on the outside of the fuel tank, the support arm 51 and the actuator end 52 form a three-point or multi-point stable structure that cooperates with the clamping assembly 2, effectively distributing the weight of the fuel tank and the additional welding load, and preventing the risk of tipping due to insufficient support points.

[0045] Specifically, the actuator 52 includes a second screw 521, one end of which is threadedly connected to the support arm 51, and the other end is connected to the actuator 52. When the second screw 521 is rotated, the axial relative movement between the threaded pairs causes the actuator 52 to move back and forth along the direction of the second screw 521, thereby precisely changing the contact distance and clamping force between the actuator 52 and the surface of the oil tank. Through the adjustable threaded mechanism, the support assembly 5 can adapt to oil tanks of different widths and geometric features without changing parts, thereby significantly improving the tooling's compatibility with multiple product specifications and reducing changeover and debugging time.

[0046] The actuator 52 also includes tightening heads 522 and clamping plates 523 respectively disposed at both ends of the second screw 521. The tightening heads 522 are used to apply tightening force manually or with tools, transmitting torque to the second screw 521 and forcing it to rotate. During tightening, the thread converts the externally applied torque into a linear thrust along the axial direction of the second screw 521, allowing the actuator 52 to precisely apply support force to the surface of the oil tank. The clamping plate 523, as the component that directly contacts the actuator 52 with the oil tank, has a flat or slightly elastic bottom surface, distributing the axial thrust transmitted by the second screw 521 over a larger contact area. Compared to point contact, the clamping plate 523 effectively avoids localized force concentration, thereby preventing scratches, indentations, or deformation of the oil tank surface.

[0047] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.

Claims

1. A welding fixture for a transformer tank, characterized in that, include: Base (1); The clamping assembly (2) includes a first guide groove (21), a pressure plate (22), a first screw (23) and a nut (24). One end of the first screw (23) passes through the pressure plate (22) and has the freedom to move linearly along the first guide groove (21). The nut (24) is threadedly connected to the other end of the first screw (23). Multiple clamping components (2) are disposed on the base (1).

2. The transformer tank welding fixture according to claim 1, characterized in that, The first screw (23) has only the degree of freedom to move linearly along the first guide groove (21).

3. The transformer tank welding fixture according to claim 1, characterized in that, A washer (25) is provided between the nut (24) and the pressure plate (22).

4. The transformer tank welding fixture according to claim 1, characterized in that, The pressure plate (22) has a second guide groove (221) along its length, and the first screw (23) moves through the second guide groove (221).

5. The transformer tank welding fixture according to claim 1, characterized in that, A frame (3) is provided between the base (1) and the clamping assembly (2), the frame (3) having flanges (31) extending outward away from each clamping assembly (2).

6. The transformer tank welding fixture according to claim 5, characterized in that, A pad (4) is provided between the clamping assembly (2) and the frame (3), and a plurality of first guide grooves (21) are sequentially formed on the pad (4) along the extension direction of the flange (31).

7. The transformer tank welding fixture according to claim 5, characterized in that, The base (1) is provided with an interface (11) that cooperates with the cradle turntable.

8. The transformer tank welding fixture according to claim 1, characterized in that, It also includes a support arm (51) that extends in the height direction and an actuator (52) that can contact the oil tank.

9. A transformer tank welding fixture according to claim 8, characterized in that, The actuator (52) includes a second screw (521), which is threadedly connected to the support arm (51).

10. A transformer tank welding fixture according to claim 9, characterized in that, The actuator (52) also includes a tightening head (522) and a pressure plate (523) respectively disposed at both ends of the second screw (521).

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