Screw tightening device for power grid transformer

Abstract

The utility model discloses a screw tightening device for a power grid transformer. The screw tightening device comprises a transformer seal, an iron core screw, a nut fixing plate, an iron core, a main shaft, a small shaft, a large bevel gear, a small bevel gear, a main shaft clamp spring, a small shaft clamp spring, a main shaft bearing seat, a support screw and a support. Under the condition that the mechanism is matched with the nut fixing plate on the other side of the iron core to limit rotation of the nut, the rod is inserted into the main shaft to rotate outside the grid power transformer, and then the iron core screw is fastened. According to the device, the bolt can be fastened without core hanging and seal opening, and the field labor cost is also reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of the electric power industry, in particular to a screw tightening device for a grid power transformer. Background Art

[0002] Amorphous alloy transformers combine energy efficiency and cost-effectiveness. Their notable feature is their extremely low no-load losses, which are only approximately 20% of those of S9 series oil-immersed transformers. This aligns with industrial policies and grid energy conservation and consumption reduction requirements, making them ideal distribution transformers for energy conservation, particularly suitable for low-load applications such as rural grids. Amorphous alloy transformers currently account for only 7%-8% of distribution transformers in operation, leading to the widespread adoption of amorphous alloy sizers. Competition in the distribution transformer market is fierce. High raw material costs, inadequate energy-efficiency assessment systems, and insufficient market supervision and management, combined with the high initial investment required to select energy-efficient transformers, have made their widespread adoption difficult. While the development of transformer energy-efficiency standards and policies started late, they are progressing rapidly. With further revisions and advancements, distribution transformer energy efficiency standards will be on par with the highest standards in developed countries.

[0003] More importantly, the energy saving of transformers is not only reflected in the loss values ​​calibrated by the transformer equipment when it leaves the factory. The establishment of a full life cycle management model for users can maximize the value of product energy saving for the economic operation management of transformers, thereby realizing the true benefits of transformer energy saving. Utility Model Content

[0004] In response to the deficiencies of the prior art, the utility model provides a screw tightening device for a grid-electric transformer. The device is realized by the following technologies: a nut fixing plate is used on one side to control the rotation of the nut, and a 1,000-bevel gear mechanism is used on the other side to transmit vertical rotational force to each row of bolts, thereby tightening the screws on the outside of the transformer.

[0005] The utility model provides a device which is a screw tightening mechanism, comprising a transformer seal, an iron core screw, a nut fixing plate, an iron core, a main shaft, a small shaft, a large bevel gear, a small bevel gear, a main shaft retaining spring, a small shaft retaining spring, a main shaft bearing seat, a bracket screw, and a bracket; this mechanism restricts the rotation of the nut by cooperating with the nut fixing plate on the other side of the iron core, and when the main shaft is inserted through a rod outside the grid power transformer and rotated, the iron core screw is tightened.

[0006] The device uses an umbrella gear mechanism to change the direction of rotation to achieve the tightening of the core screw, and there is no need to remove the seal before tightening the core screw.

[0007] The rotation limit of the core nut requires a nut fixing plate to limit the position, and the holes on the nut fixing plate correspond to the nuts for limiting the rotation.

[0008] The end of the small shaft needs to be opened with a hexagonal hole or a square hole corresponding to the bolt head for rotating and tightening the iron core screw.

[0009] The top end of the main shaft is sealed for the transformer, which utilizes an interface for rotating the shaft through an external tool, and adopts the form of a shaft opening or the upper end of the main shaft is turned into two side planes to seal the outside. The size of the rotating main shaft is adjusted by using a wrench.

[0010] The main shaft and small shaft of the screw tightening mechanism are tightly matched with the axial hole of the bracket, and axial limitation is performed through the main shaft retaining spring and the small shaft retaining spring, while the use of screws on the mechanism is reduced.

[0011] The beneficial effects of the utility model are as follows:

[0012] The core bolts inside the transformer can be tightened at any time, ensuring the tightness of the core bolts and reducing the risk during transformer operation. The bolts can be tightened without lifting the core and opening the seal, which also reduces on-site labor costs. Through this mechanism, the grid power transformer becomes an integrated product, and there is no need to lift the bolts to deal with the problem because the bolts are loose or there is a problem with the use. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. It should be apparent that the drawings described below are merely specific embodiments described in this application and do not limit the scope of protection of the present invention. It is clear that those skilled in the art can, without inventive effort, derive other embodiments and drawings based on the following embodiments and drawings of the present invention.

[0014] Figure 1 This is a diagram of the overall usage of the utility model;

[0015] Figure 2 This is a structural diagram of a screw tightening mechanism (1) for a grid-electric transformer according to the present invention;

[0016] Figure 3 It is a diagram showing the use of a nut fixing plate (4) of the present utility model.

[0017] Figure markings: screw tightening mechanism-1, transformer seal-2, iron core screw-3, nut fixing plate-4, iron core-5, iron core nut-6, main shaft-7, small shaft-8, large bevel gear-9, small bevel gear-10, main shaft retaining spring-11, small shaft retaining spring-12, main shaft bearing seat-13, bracket screw-14, bracket-15. DETAILED DESCRIPTION

[0018] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0019] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in a variety of different forms and should not be interpreted as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of this application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. In the accompanying drawings, for the sake of clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to represent the same devices, and thus their descriptions will be omitted.

[0020] This example provides a grid power transformer screw tightening device, such as Figure 1-Figure 3 The device is a screw tightening mechanism 1, which includes a transformer seal 2, an iron core screw 3, a nut fixing plate 4, an iron core 5, a main shaft 7, a small shaft 8, a large bevel gear 9, a small bevel gear 10, a main shaft retaining spring 11, a small shaft retaining spring 12, a main shaft bearing seat 13, a bracket screw 14, and a bracket 15; this mechanism restricts the rotation of the nut by cooperating with the nut fixing plate 4 on the other side of the iron core 5, and tightens the iron core screw 3 after the main shaft 7 is inserted through a rod and rotated outside the grid power transformer.

[0021] The screw tightening mechanism 1 is meshed with the large bevel gear 9 and the small bevel gear 10. The small bevel gear 10 is connected to the small shaft 8. The small shaft 8 corresponds to the outer edge of the core screw 3. A sleeve is welded in the bracket 15, which is tightly matched with the small shaft 8 and the main shaft 7. The small shaft retaining spring 12 locks the axial position of the shaft through the groove opened in the small shaft 8. The axial position of the main shaft 7 is locked by the main shaft bearing seat 13, and the axial position of the large bevel gear 9 and the small bevel gear 10 is also locked by the retaining spring. The main shaft and the external transformer seal 2 also need to be equipped with corresponding static seals and dynamic seals to ensure the seal between the inside and outside when the main shaft top rotates. Seal, since it is a static and dynamic seal, it is a conventional design and will not be described in detail here. At this time, the small shaft 8 can be rotated by rotating the main shaft 7 through an external wrench or round rod, thereby achieving the purpose of rotating the iron core screw 3. However, a corresponding nut fixing plate 4 is required on the other side of the iron core 5. After the nut fixing plate 4 has a hole corresponding to the outer edge of the iron core nut 6, it prevents the iron core nut 6 from rotating. After the overall mechanism is adjusted, it is fixed in position through the bracket screw 14. In this way, the entire mechanism completes the purpose of tightening a row of bolts from the outside. If there are multiple rows, more such mechanisms should be set up.

[0022] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A screw tightening device for a grid-powered transformer, characterized in that: The device is a screw tightening mechanism (1), comprising a transformer seal (2), an iron core screw (3), a nut fixing plate (4), an iron core (5), a main shaft (7), a small shaft (8), a large bevel gear (9), a small bevel gear (10), a main shaft retaining spring (11), a small shaft retaining spring (12), a main shaft bearing seat (13), a bracket screw (14), and a bracket (15); in the screw tightening mechanism (1), the large bevel gear (9) and the small bevel gear (10) are engaged, the small bevel gear (10) is connected to the small shaft (8), and the small shaft (8) corresponds to the iron core. The outer edge of the core screw (3) is welded with a shaft sleeve in the bracket (15), which is tightly matched with the small shaft (8) and the main shaft (7). The small shaft retaining spring (12) locks the axial position of the shaft through the groove opened in the small shaft (8), and the axial position of the main shaft (7) is locked by the main shaft bearing seat (13); this mechanism restricts the rotation of the nut by cooperating with the nut fixing plate (4) on the other side of the iron core (5). Outside the grid power transformer, the iron core screw (3) is tightened after the rod is inserted into the main shaft (7) and rotated.

2. A screw tightening device for grid-connected transformer according to claim 1, characterized in that: The device uses an umbrella gear mechanism to change the transmission direction of rotation to achieve the tightening of the iron core screw (3), and there is no need to dismantle the seal before tightening the iron core screw (3).

3. The screw tightening device for grid-connected transformer according to claim 1, characterized in that: It also includes an iron core nut (6), and the rotation limit of the iron core nut (6) requires a nut fixing plate (4) to limit the position, and the hole on the nut fixing plate (4) corresponds to the nut for limiting the rotation.

4. A screw tightening device for grid-connected transformer according to claim 1, characterized in that: The end of the small shaft (8) needs to be provided with a hexagonal hole or a square hole corresponding to the bolt head for rotating and tightening the core screw (3).

5. The screw tightening device for grid-connected transformer according to claim 1, characterized in that: The top end of the main shaft (7) is a transformer seal (2), which utilizes an interface for rotating the shaft through an external tool, and adopts the form of a shaft opening or the method of turning the upper end of the main shaft (7) into two side planes to seal the outside.

6. The screw tightening device for grid-connected transformer according to claim 1, characterized in that: The main shaft (7) and the small shaft (8) of the screw tightening mechanism (1) are tightly matched with the axial hole of the bracket (15), and the main shaft retaining spring (11) and the small shaft retaining spring (12) are used to perform axial limitation, and at the same time, the number of screws used on the mechanism is reduced.

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