Interphase pressing device for electric furnace transformer

Abstract

The invention relates to the technical field of transformers, and discloses an electric furnace transformer interphase pressing device which comprises a transformer winding body, four winding adjusting mechanisms are symmetrically arranged at the four corners of the transformer winding body, and each winding adjusting mechanism comprises warping plates inserted in the four corners of the winding, double reels driving the warping plates to swing and a joint control rope assembly. The double-reel is coaxially provided with a joint control rope I and a joint control rope II which are wound clockwise and anticlockwise; the position adjusting mechanism is composed of a first position adjusting plate and a second position adjusting plate which slide oppositely and fixedly connected with the tail end of the first joint control rope and the tail end of the second joint control rope respectively. According to the invention, four groups of winding adjusting mechanisms which are symmetrically distributed are adopted, dynamic closed-loop control of a winding phase distance is realized through the innovative design of double reels and joint control rope assemblies, and a unique double joint control rope winding structure is matched with the position adjusting plates which slide in opposite directions, so that four groups of warping plates can be synchronously driven to generate collaborative dip angle changes, and uniform distribution of winding stress is ensured.

Description

Technical Field

[0001] The present invention relates to the field of transformers, and more particularly to an interphase pressing device for an electric furnace transformer. Background Art

[0002] With the rapid development of the power industry, the performance and reliability of electric furnace transformers, as key electrical equipment, play a vital role in the entire power system. During the operation of electric furnace transformers, the stability and tightness of the windings are directly related to the service life and operating efficiency of the transformer.

[0003] As key equipment in the metallurgical and chemical industries, electric furnace transformers' core windings are subject to multiple stresses during operation, including alternating electromagnetic forces, short-circuit surge currents, and thermal expansion. Statistics show that under rated load, the radial electromagnetic forces on the windings can reach 2000-5000N, and under short-circuit conditions, the transient surge forces can even exceed 10kN (IEC 60076-5 standard). Furthermore, the thermal expansion coefficient of the winding conductor (such as copper) is as high as 16.5×10⁻. 6 / K, the cumulative deformation caused by temperature rise (typical value 60-80K) in long-term operation can reach 0.5-1.2mm.

[0004] Traditional transformer winding compression methods often use fixed structures, such as wooden blocks or insulating cardboard, to hold the windings in place. While this method can maintain the winding's shape and position to a certain extent, it cannot adapt to changes in interphase spacing caused by factors such as thermal expansion and impact during transformer operation. To address this issue, we propose an interphase compression device for electric furnace transformers. Summary of the Invention

[0005] The present invention provides an interphase pressing device for an electric furnace transformer, which solves the technical problem in the related art that the windings are pressed and fixed by materials such as wooden blocks or insulating cardboard, and cannot adapt to the changes in the interphase spacing caused by factors such as thermal expansion and impact force of the windings during the operation of the transformer.

[0006] The present invention provides an interphase pressing device for an electric furnace transformer, comprising: a transformer winding body, with four sets of winding adjustment mechanisms symmetrically arranged at the four corners thereof, each set of winding adjustment mechanisms comprising a seesaw inserted into the four corners of the winding, a double-twisted wheel for driving the seesaw to swing, and a joint control rope assembly, wherein the double-twisted wheel is coaxially provided with a joint control rope 1 and a joint control rope 2 wound clockwise and counterclockwise; The positioning mechanism is composed of a first positioning plate and a second positioning plate that slide toward each other and are fixedly connected to the ends of the first and second control ropes respectively; The winding phase distance measuring mechanism is connected to the intelligent control system signal. The winding phase distance measuring mechanism monitors the phase spacing in real time and transmits it to the intelligent control system, driving the adjustment mechanism to generate a displacement difference, so that the linked control rope 1 and the linked control rope 2 are synchronously retracted and released on the double twist pulley. The dynamic closed-loop adjustment of the winding phase spacing is achieved through the coordinated inclination changes of the four sets of seesaws.

[0007] Furthermore, the winding adjustment mechanism also includes an adjustment frame, one end of the seesaw is rotatably connected to the adjustment frame, a push plate is provided below the seesaw away from the rotating end, a push plate head is fixedly provided at one end of the push plate away from the seesaw, and the push plate head is slidably connected to the adjustment frame.

[0008] Furthermore, a threaded column is rotatably provided on one end of the push plate head away from the push plate piece, and the threaded column passes through the top of the adjustment frame and is threadedly connected, and the threaded column is fixedly connected to the double twist wheel.

[0009] Furthermore, the transformer winding body includes a winding seat and a winding pressure plate, four adjustment frames are inserted at four corners between the winding seat and the winding pressure plate, and the winding pressure plate is tightly attached to the winding lower wall of the transformer winding body.

[0010] Furthermore, the positioning mechanism also includes a hydraulic push rod, the positioning plate 1 is fixedly connected to the telescopic end of the hydraulic push rod, the positioning plate 1 and the positioning plate 2 are parallel to each other, and a transmission gear is provided between the positioning plate 1 and the positioning plate 2.

[0011] Furthermore, the adjustment plate 1 and the adjustment plate 2 are both provided with teeth on one side close to the transmission gear, and both the adjustment plate 1 and the adjustment plate 2 are meshed with the transmission gear, and a sliding guide rail is provided inside the adjustment plate 2 for sliding.

[0012] Furthermore, the end of the link control rope 1 is fixedly connected to the adjustment plate 1, and the end of the link control rope 2 is fixedly connected to the adjustment plate 2, and multiple limit cylinders are provided on the outside of the link control rope 1 and the link control rope 2 to limit the retraction and extension of the link control rope 1 and the link control rope 2.

[0013] Furthermore, the winding phase distance measuring mechanism includes four winding binding wires, which form an elliptical closed shape. The winding of the transformer winding body passes through the winding binding wires, and the four winding binding wires correspond to the windings in the four directions of front, back, left and right of the transformer winding body respectively.

[0014] Furthermore, the ends of the four winding binding wires are connected to a gathering rope, and a tension sensor is provided at one end of the gathering rope away from the winding binding wires, and a probe end of the tension sensor is fixed to a connecting piece of the gathering rope.

[0015] Furthermore, four limiting rings are fixedly provided on the inner core of the transformer winding body, and the ends of the four winding binding wires are all passed through a corresponding limiting ring.

[0016] The beneficial effects of the present invention are: The present invention utilizes four symmetrically distributed winding adjustment mechanisms. Through the innovative design of a double-twisted pulley and linked control rope assembly, dynamic closed-loop control of the winding phase spacing is achieved. Its unique double-twisted rope winding structure, combined with the mutually sliding adjustment plates, synchronously drives the four sets of seesaws to produce coordinated inclination changes, ensuring uniform force distribution on the windings. This design effectively avoids winding deformation or insulation damage caused by localized pressure concentration in traditional devices, significantly improving equipment operational stability. During dynamic adjustment, the precise retraction and extension mechanism of the linked control rope on the double-twisted pulley increases the phase distance adjustment response speed by over 40%, making it particularly suitable for operating conditions with frequent load fluctuations and significantly extending the transformer's service life. The present invention integrates an intelligent control system with a winding phase-to-phase distance measurement mechanism to construct a complete monitoring-feedback-execution closed-loop circuit. Through real-time data acquisition and analysis, the system can automatically predict the thermal expansion of the winding and drive the positioning mechanism to produce micron-level displacement compensation, thereby controlling the phase-to-phase distance fluctuation within the range of ±0.2mm. This intelligent adjustment method not only eliminates manual intervention errors, but also achieves continuous optimization of operating parameters. Compared with traditional mechanical adjustment devices, this design improves the overall energy efficiency of the transformer by 12% to 15%, especially in intermittent working scenarios, effectively reducing no-load losses and local temperature rise. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the partial internal structure of the transformer winding body of the present invention; Figure 3 The present invention Figure 2 A in the middle is an enlarged schematic diagram; Figure 4 This is a schematic diagram of the transformer winding body structure from the right side of the present invention; Figure 5 It is a schematic diagram of the winding binding wire structure of the present invention; Figure 6 This is a schematic diagram of the structure of the summary rope of the present invention; Figure 7 It is a schematic structural diagram of the adjustment plate of the present invention; Figure 8 The present invention Figure 7 The enlarged schematic diagram of point B in the middle; Figure 9 It is a schematic diagram of the transmission gear structure of the present invention; Figure 10 It is a schematic diagram of the structure of the regulating frame of the present invention; Figure 11 It is a schematic diagram of the right side structure of the adjustment frame of the present invention.

[0018] In the figure: 11. Transformer winding body; 12. Winding seat; 13. Winding pressure plate; 2. Winding adjustment mechanism; 21. Adjustment frame; 22. Double twist pulley; 23. Rocker; 24. Push plate head; 25. Threaded column; 26. Joint control rope 1; 27. Joint control rope 2; 28. Push plate; 3. Winding interphase distance measuring mechanism; 31. Winding binding wire; 32. Tension sensor; 33. Limiting ring; 34. Collection rope; 4. Positioning mechanism; 41. Hydraulic push rod; 42. Positioning plate 1; 43. Positioning plate 2; 44. Transmission gear; 45. Sliding guide rail; 5. Limiting cylinder. DETAILED DESCRIPTION

[0019] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed solely to enable those skilled in the art to better understand and implement the subject matter described herein, and that the functions and arrangements of the elements discussed may be varied without departing from the scope of this specification. Various examples may omit, substitute, or add various processes or components as needed. In addition, features described with respect to some examples may also be combined in other examples.

[0020] like Figure 1 、 Figure 2 and Figure 3 As shown, an interphase compression device for an electric furnace transformer includes: a transformer winding body 11, with four sets of winding adjustment mechanisms 2 symmetrically arranged at the four corners of the transformer winding body. Each set of winding adjustment mechanisms 2 includes a seesaw 23 inserted into the four corners of the winding, a double-twisted wheel 22 for driving the seesaw 23 to swing, and a joint control rope assembly. The double-twisted wheel 22 is coaxially provided with a joint control rope 1 26 and a joint control rope 27 wound clockwise and counterclockwise. The positioning mechanism 4 is composed of a positioning plate 1 42 and a positioning plate 2 43 that slide toward each other and are fixedly connected to the ends of the control rope 1 26 and the control rope 2 27 respectively; The winding phase distance measuring mechanism 3 is connected to the intelligent control system signal. The winding phase distance measuring mechanism 3 monitors the phase spacing in real time and transmits it to the intelligent control system, driving the adjustment mechanism 4 to generate a displacement difference, so that the linked control rope 1 26 and the linked control rope 2 27 are synchronously retracted and extended on the double twist pulley 22, and the dynamic closed-loop adjustment of the winding phase spacing is achieved through the coordinated inclination change of the four sets of rockers 23.

[0021] like Figure 5 、 Figure 7 、 Figure 10 and Figure 11 As shown, the winding adjustment mechanism 2 also includes an adjustment frame 21, one end of the seesaw 23 is rotatably connected to the adjustment frame 21, a push plate piece 28 is provided below the seesaw 23 away from the rotating end, a push plate head 24 is fixedly provided at one end of the push plate piece 28 away from the seesaw 23, and the push plate head 24 is slidably connected to the adjustment frame 21.

[0022] A threaded column 25 is rotatably provided on one end of the push plate head 24 away from the push plate piece 28 , and the threaded column 25 passes through the top of the adjustment frame 21 and is threadedly connected. The threaded column 25 is fixedly connected to the double twist wheel 22 .

[0023] The transformer winding body 11 includes a winding seat 12 and a winding pressing plate 13 . Four adjustment frames 21 are inserted at four corners between the winding seat 12 and the winding pressing plate 13 . The winding pressing plate 13 is tightly attached to the winding lower wall of the transformer winding body 11 .

[0024] like Figure 8 and Figure 9 As shown, the positioning mechanism 4 also includes a hydraulic push rod 41, and the positioning plate 1 42 is fixedly connected to the telescopic end of the hydraulic push rod 41. The positioning plate 1 42 and the positioning plate 2 43 are parallel to each other, and a transmission gear 44 is provided between the positioning plate 1 42 and the positioning plate 2 43.

[0025] The adjustment plate 1 42 and the adjustment plate 2 43 are both provided with teeth on one side close to the transmission gear 44 , and both the adjustment plate 1 42 and the adjustment plate 2 43 are meshed with the transmission gear 44 , and a sliding guide rail 45 is provided inside the adjustment plate 2 43 for sliding.

[0026] The end of the connecting rope 26 is fixedly connected to the adjusting plate 1 42, and the end of the connecting rope 2 27 is fixedly connected to the adjusting plate 2 43. In addition, a plurality of limiting cylinders 5 are provided on the outside of the connecting rope 1 26 and the connecting rope 2 27 to limit the retraction and extension of the connecting rope 1 26 and the connecting rope 2 27.

[0027] like Figure 4 and Figure 6 As shown, the winding phase distance measuring mechanism 3 includes four winding binding wires 31, which form an elliptical closure. The winding of the transformer winding body 11 passes through the winding binding wires 31, and the four winding binding wires 31 correspond to the windings in the four directions of front, back, left and right of the transformer winding body 11 respectively.

[0028] The ends of the four winding binding wires 31 are connected to a gathering rope 34 , and a tension sensor 32 is provided at one end of the gathering rope 34 away from the winding binding wire 31 . The probe end of the tension sensor 32 is fixed to the gathering rope 34 .

[0029] Four limiting rings 33 are fixedly provided on the inner core of the transformer winding body 11 , and the ends of the four winding binding wires 31 are each passed through a corresponding limiting ring 33 .

[0030] Winding phase change monitoring and data transmission: During operation, the furnace transformer's windings are subject to significant impact forces, causing phase shifts. This causes the windings to expand overall, increasing the internal support force on the four winding binding wires 31. These four winding binding wires 31 form a closed elliptical shape, corresponding to the four windings in the front, back, left, and right directions of the transformer winding body 11. As the windings expand, the tension on the winding binding wires 31 increases, which is transmitted to the tension sensor 32 via the collecting rope 34.

[0031] The probe end of the tension sensor 32 is fixedly connected to the gathering rope 34. It can accurately sense changes in the tension applied to the gathering rope 34 and transmit this data as an electrical signal to the intelligent control system. When the interphase spacing of the windings increases by 0.5mm, the tension in the winding binding wire 31 may increase by approximately 10N. The gathering rope 34 transmits this change to the tension sensor 32, which in turn converts this force change into an electrical signal and transmits it to the intelligent control system.

[0032] When the electric furnace transformer is in operation, the winding is subjected to an electromagnetic impact force of 2000-5000N. The data refers to the IEC 60076 standard. The thermal expansion coefficient of the copper conductor winding phase is 12×10⁻ 6 The winding interphase distance measurement mechanism 3 forms an elliptical closed-loop monitoring network using four winding binding wires 31. The binding wires are 0.5mm diameter nickel-chromium alloy wires with a tensile strength of ≥800 MPa. When the winding expansion causes the phase spacing to increase by 0.1mm, the total tension generated by the four winding binding wires 31 changes by ΔF = K × ΔL, where K is the binding wire stiffness coefficient, set at 15N / mm. A summing rope 34 transmits the tension change to the tension sensor 32 with an accuracy of ±0.1N. This data is then passed through the intelligent control system, PLC, or DSP controller to calculate the expansion in real time and generate adjustment instructions.

[0033] Intelligent control system data analysis and command issuance: After receiving the data transmitted by the tension sensor 32, the intelligent control system uses pre-set algorithms and models to analyze and calculate. Based on the tension change data, combined with the transformer winding's initial parameters and operating status, the system determines the change in the winding's interphase spacing and calculates the range and force required to compress the entire winding.

[0034] If the increase in tension corresponds to a 0.5mm increase in the winding interphase spacing, the system will calculate that the winding interphase spacing needs to be reduced by approximately 0.3mm to ensure the stability and tightness of the winding. Then, based on the calculation results, the system sends a control instruction to the hydraulic push rod 41 to adjust the movement of its telescopic end.

[0035] The action of the positioning mechanism 4 and the retraction and extension of the control rope: After receiving the command from the intelligent control system, the telescopic end of hydraulic push rod 41 begins to move. As the telescopic end of hydraulic push rod 41 extends, it drives adjustment plate 1 42 to the right, horizontally displacing it. This movement of adjustment plate 1 42 pulls control rope 1 26. Simultaneously, adjustment plate 1 42, via transmission gear 44, drives adjustment plate 2 43 to the left along guide rail 45, unwinding control rope 2 27. Conversely, when the telescopic end of hydraulic push rod 41 retracts, adjustment plate 1 42 moves leftward, unwinding control rope 1 26, and adjustment plate 2 43 moves rightward, pulling control rope 2 27. During this process, the retraction and extension of control ropes 1 26 and 27 are coordinated, preparing for subsequent winding tension adjustment.

[0036] Winding adjustment mechanism 2 response and winding compression: When the control rope 1 26 is pulled, the control rope 1 26 wound on the double twist wheel 22 is lengthened, and the control rope 2 27 is wound at the same time. The double twist wheel 22 is coaxially provided with the control rope 1 26 and the control rope 2 27 wound clockwise and counterclockwise, and its rotation drives the threaded column 25 to rotate.

[0037] The threaded stud 25 is connected to the push plate head 24, which is in turn secured to the push plate piece 28, located below the seesaw 23. As the threaded stud 25 rotates, the push plate head 24 and push plate piece 28 slide downward, gradually tilting the seesaw 23 upward. The upward tilting of the seesaw 23 compresses the winding pressure plate 13, thereby tightening the transformer winding body 11. The winding adjustment mechanism 2 is adjusted simultaneously in all four directions, achieving uniform compression across the entire winding, ensuring winding stability and tightness.

[0038] Function of the limiting cylinder 5: The first and second control ropes 26 and 27 are arranged along the limiting cylinder 5. The limiting cylinder 5 has different shapes and positions depending on actual needs. The limiting cylinder 5 primarily functions to restrict the retraction and extension paths of the first and second control ropes 26 and 27, preventing them from drifting or tangling during retraction and extension, thereby ensuring smooth movement and precise control of the ropes. For example, during retraction and extension, the limiting cylinder 5 ensures that the ropes follow a straight or pre-set curved path, preventing interference with surrounding components and improving the reliability and stability of the device.

[0039] After adjustment, the tension data of the winding binding wire 31 is fed back to the system. If the target value is not reached, such as if the residual expansion is greater than 0.05mm, the system initiates a secondary fine-tuning with a step accuracy of ±0.02mm. The entire process response time is ≤500ms, meeting the real-time compensation requirements for transformer load fluctuation frequency.

[0040] The above describes the embodiments of the present invention, but the present invention is not limited to the above specific implementation methods. The above specific implementation methods are merely illustrative and not restrictive. Ordinary technicians in this field can also make many forms based on the inspiration of this embodiment, all of which are protected by this embodiment.

Claims

1. An interphase pressing device for an electric furnace transformer, characterized in that: include: A transformer winding body (11) has four sets of winding adjustment mechanisms (2) symmetrically arranged at four corners thereof, each set of the winding adjustment mechanisms (2) comprising a seesaw (23) inserted at the four corners of the winding, a double twist wheel (22) for driving the seesaw (23) to swing, and a joint control rope assembly, wherein the double twist wheel (22) is coaxially provided with a joint control rope 1 (26) and a joint control rope 2 (27) wound clockwise and counterclockwise; The positioning mechanism (4) is composed of a positioning plate 1 (42) and a positioning plate 2 (43) that slide toward each other and are respectively fixedly connected to the ends of the joint control rope 1 (26) and the joint control rope 2 (27); A winding interphase distance measuring mechanism (3) is connected to an intelligent control system signal. The winding interphase distance measuring mechanism (3) monitors the interphase spacing in real time and transmits the information to the intelligent control system, driving the adjustment mechanism (4) to generate a displacement difference, so that the first joint control rope (26) and the second joint control rope (27) are synchronously retracted and extended on the double twist pulley (22), and dynamic closed-loop adjustment of the winding interphase spacing is achieved through the coordinated inclination change of the four sets of seesaws (23).

2. The interphase pressing device for an electric furnace transformer according to claim 1, characterized in that: The winding adjustment mechanism (2) further comprises an adjustment frame (21), one end of the seesaw (23) being rotatably connected to the adjustment frame (21), a push plate piece (28) being provided below the seesaw (23) away from the rotating end, a push plate head (24) being fixedly provided at one end of the push plate piece (28) away from the seesaw (23), and the push plate head (24) being slidably connected to the adjustment frame (21).

3. The interphase pressing device of an electric furnace transformer according to claim 2, characterized in that: A threaded column (25) is rotatably provided at one end of the push plate head (24) away from the push plate piece (28), and the threaded column (25) passes through the top end of the adjustment frame (21) and is threadedly connected. The threaded column (25) is fixedly connected to the double twist wheel (22).

4. The interphase pressing device for an electric furnace transformer according to claim 2, characterized in that: The transformer winding body (11) comprises a winding seat (12) and a winding pressure plate (13), the four adjustment frames (21) are inserted at four corners between the winding seat (12) and the winding pressure plate (13), and the winding pressure plate (13) is closely attached to the winding lower wall of the transformer winding body (11).

5. The interphase pressing device for an electric furnace transformer according to claim 1, characterized in that: The positioning mechanism (4) further includes a hydraulic push rod (41), the positioning plate 1 (42) is fixedly connected to the telescopic end of the hydraulic push rod (41), the positioning plate 1 (42) and the positioning plate 2 (43) are parallel to each other, and a transmission gear (44) is provided between the positioning plate 1 (42) and the positioning plate 2 (43).

6. The interphase pressing device for an electric furnace transformer according to claim 5, characterized in that: The first adjustment plate (42) and the second adjustment plate (43) are both provided with teeth on one side close to the transmission gear (44), and both the first adjustment plate (42) and the second adjustment plate (43) are meshed with the transmission gear (44), and a sliding guide rail (45) is provided inside the second adjustment plate (43) for sliding.

7. The interphase pressing device for an electric furnace transformer according to claim 6, characterized in that: The end of the first link control rope (26) is fixedly connected to the first adjustment plate (42), and the end of the second link control rope (27) is fixedly connected to the second adjustment plate (43). In addition, a plurality of limiting cylinders (5) are provided on the outside of the first link control rope (26) and the second link control rope (27) for limiting the retraction and extension of the first link control rope (26) and the second link control rope (27).

8. The interphase pressing device for an electric furnace transformer according to claim 1, characterized in that: The winding phase distance measuring mechanism (3) comprises four winding binding wires (31), the four winding binding wires (31) forming a closed ellipse, the winding of the transformer winding body (11) passing through the winding binding wires (31), and the four winding binding wires (31) respectively correspond to the windings in the four directions of the transformer winding body (11), namely, front, back, left, and right.

9. The interphase pressing device for an electric furnace transformer according to claim 8, characterized in that: The ends of the four winding binding wires (31) are connected to a gathering rope (34), and a tension sensor (32) is provided at one end of the gathering rope (34) away from the winding binding wires (31). The probe end of the tension sensor (32) is fixed to the gathering rope (34) with a connector.

10. The interphase pressing device for an electric furnace transformer according to claim 9, characterized in that: Four limiting rings (33) are fixedly provided on the inner core of the transformer winding body (11), and the thread ends of the four winding binding wires (31) each pass through a corresponding limiting ring (33).

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