Coil press-fitting device with pressure

Abstract

The utility model discloses a coil press-fitting device with pressure, which relates to the technical field of transformers and comprises a locking device, a spring device, an upper press plate, a lower press plate and a hydraulic system. The upper pressing plate and the lower pressing plate are arranged in parallel; a spring device is arranged above the upper pressing plate, and a locking device is arranged above the spring device; the spring device comprises an iron plate cross, a protective cylinder and a spring; the iron plate cross is horizontally arranged above the upper pressing plate; the protective cylinder is arranged between the iron plate cross and the upper pressing plate; the spring is mounted in the protective cylinder; the hydraulic system comprises a hydraulic cylinder; and the hydraulic cylinder is mounted on the top surface of the iron plate cross. The device is small in occupied area, and does not need a special space for placing press-fitting equipment; in the coil drying water outlet descending process, the coil can be continuously pressed, and pressure is applied to the coil, so that the coil is always in a pressed state, the coil is compact, and the coil height required by production is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of transformers, and particularly relates to a coil pressing device with self-pressure. Background Art

[0002] For large and medium-sized transformers, the height of the coil is composed of copper wire and pads. After the coil is wound, it needs to be set, and then pressed and dried. At present, the industry often uses two methods for press-fit drying: one method is to use special equipment and constant pressure drying; when this press-fit method presses and dries the coil, as the water inside the coil pad is continuously removed and shrinks, the coil height will continue to decrease. By controlling the stroke of the hydraulic cylinder and pressurizing in stages, the coil maintains a constant pressure. After the water is completely removed, the wire and pad structure are dense to reach the required coil height; however, this coil press-fit drying method is expensive, occupies a large space, has low equipment efficiency, and has a high production cost for enterprises. Another method is to directly press the coil with a hydraulic cylinder and lock it with a nut. When the coil pad shrinks due to water outflow and causes the coil height to decrease, the entire coil will lose pressure, causing the pad and wire to be fluffy, and the coil will not reach the required height after drying. Utility Model Content

[0003] The purpose of the utility model is to provide a coil pressing device with its own pressure, which occupies a small area and does not require a special space to place the pressing equipment. It can also continuously press the coil and apply pressure to the coil during the process of the coil drying and water descending, so that the coil is always in a pressed state, thereby making the coil tight and reaching the coil height required for production. The specific technical solution is as follows:

[0004] A coil pressing device with self-pressure, comprising a locking device, a spring device, an upper pressing plate, a lower pressing plate and a hydraulic system; the upper pressing plate and the lower pressing plate are arranged parallel to each other; a spring device is arranged above the upper pressing plate, and a locking device is arranged above the spring device; the spring device comprises an iron plate cross, a protective tube and a spring; the iron plate cross is arranged horizontally above the upper pressing plate; the protective tube is arranged between the iron plate cross and the upper pressing plate; the spring is installed inside the protective tube; the hydraulic system comprises a hydraulic cylinder; and the hydraulic cylinder is installed on the top surface of the iron plate cross.

[0005] Preferably, the locking device includes a locking bolt and a channel steel cross; the steel channel cross is installed above the iron plate cross; the locking bolt is arranged above the protective tube, the channel steel cross has a threaded hole, the locking bolt is screwed into the threaded hole on the channel steel cross, and is pressed against the iron plate cross.

[0006] Preferably, it also includes an iron pressure cake; the iron pressure cake is arranged between the channel steel cross and the iron plate cross; the iron pressure cake is arranged above the protective tube; the lower end of the locking bolt is against the top surface of the iron pressure cake, and the bottom surface of the iron pressure cake is tightly attached to the iron plate cross.

[0007] Preferably, it also includes a locking nut and a screw; the four protruding rods of the channel steel cross are respectively provided with through holes, and the edges of the upper pressure plate and the lower pressure plate are respectively provided with corresponding through holes; the screw passes through the through holes of the channel steel cross, the upper pressure plate and the lower pressure plate to connect the channel steel cross, the upper pressure plate and the lower pressure plate together; a baffle is provided at the lower end of the screw, and a locking nut is installed at the upper end.

[0008] Preferably, the upper pressing plate and the lower pressing plate are circular.

[0009] Preferably, a protective tube is respectively provided on the bottom surface of the four extending rods of the iron plate cross.

[0010] Compared with the existing technology, the utility model has the following beneficial effects:

[0011] The utility model provides an upper pressing plate and a lower pressing plate to press the coil, and compresses the spring through a hydraulic cylinder. When the coil dries out of water and descends, the upper pressing plate descends, and the compressed spring extends outward by elastic force, continuously pressing the upper pressing plate, applying pressure to the coil, so that the coil is always in a compressed state, thereby making the coil tight and achieving the coil height required for production. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order 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. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0013] Figure 1 It is a structural schematic diagram of the utility model.

[0014] Description of main reference numerals:

[0015] 1-locking device, 2-spring device, 3-upper pressure plate, 4-lower pressure plate, 5-hydraulic cylinder, 6-locking nut, 7-screw, 8-pressure block, 9-coil, 11-locking bolt, 12-channel steel cross, 13-iron pressure cake, 21-iron plate cross, 22-protective tube, 23-spring. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0017] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "top", "bottom", "top surface", "bottom surface", "inside", "outside", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0018] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If the terms "first", "second", "third" are described, they are only used for the purpose of description and distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0019] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The following is a description of the embodiments of the present invention based on its overall structure.

[0020] Example 1

[0021] As shown in the figure, a coil pressing device with self-pressure includes a locking device, a spring device, an upper pressing plate, a lower pressing plate and a hydraulic system; the upper pressing plate and the lower pressing plate are arranged parallel to each other; a spring device is arranged above the upper pressing plate, and a locking device is arranged above the spring device; the spring device includes an iron plate cross, a protective tube and a spring; the iron plate cross is arranged horizontally above the upper pressing plate; the protective tube is arranged between the iron plate cross and the upper pressing plate; the spring is installed inside the protective tube; the hydraulic system includes a hydraulic cylinder; and the hydraulic cylinder is installed on the top surface of the iron plate cross.

[0022] Next, the working principle of the embodiment is described in detail to enable those skilled in the art to better understand the present invention:

[0023] The coil is arranged between the upper pressing plate and the lower pressing plate, and the upper pressing plate and the lower pressing plate are used to compress the coil; there are respectively provided pressing blocks between the coil and the upper pressing plate, and between the coil and the lower pressing plate; the pressing blocks play an auxiliary pressing role, and compress the coil together with the upper pressing plate and the lower pressing plate. The hydraulic cylinder is externally connected to a hydraulic press, and the hydraulic cylinder is used to compress the spring; before the spring is compressed, the upper half of the spring is located outside the protective tube, and the iron plate cross is lifted upward. When the hydraulic cylinder is started, the iron plate cross is pressed down, and the spring is compressed into the protective tube, and it continues to be pressed down to compress the coil.

[0024] When working, first place the coil on the lower pressure plate, and then install the upper pressure plate, spring device, and locking device on the coil in turn. Then place the hydraulic cylinder on the top surface of the iron plate cross, and connect the hydraulic cylinder to the hydraulic pump. By starting the hydraulic cylinder, the hydraulic cylinder uses the iron plate cross as the base point to press the spring and coil below together. After pressing the coil down to the specified height, tighten the locking bolt and remove the hydraulic cylinder. Then transport the coil and the pressing device into the furnace for drying. During the drying process, the pad of the coil will dehydrate, causing the coil to sink continuously and the height to decrease, which in turn causes the height of the upper pressure plate to decrease; at this time, the spring pushes outward, and under the action of elastic force, the upper pressure plate is pressed down, and the coil continues to be pressed and shaped; as the coil continues to descend, the elastic force of the spring will also decrease accordingly. When the spring pressure is not enough to resist the upper pressure plate, the coil pressing and drying is completed.

[0025] Example 2

[0026] The difference between this embodiment and embodiment 1 is that the locking device includes a locking bolt and a channel steel cross; the channel steel cross is installed above the iron plate cross; the locking bolt is arranged above the protective tube, the channel steel cross has a threaded hole, the locking bolt is screwed into the threaded hole on the channel steel cross, and is pressed against the iron plate cross.

[0027] The channel steel cross is used to install the locking bolt; the locking bolt is used to lock the spring device; after the locking bolt is screwed into the threaded hole on the channel steel cross, it extends downward and presses against the iron plate cross, pressing and fixing the iron plate cross and the protective tube downward, so that the upper pressure plate presses the coil.

[0028] The working principle of this embodiment is the same as that of embodiment 1.

[0029] Example 3

[0030] This embodiment differs from Embodiment 2 in that it further comprises an iron pressure cake; the iron pressure cake is arranged between the channel steel cross and the iron plate cross; the iron pressure cake is arranged above the protective tube; the lower end of the locking bolt is against the top surface of the iron pressure cake, and the bottom surface of the iron pressure cake is in close contact with the iron plate cross.

[0031] The lower end of the locking bolt is pressed against the top surface of the iron pressing cake, and the bottom surface of the iron pressing cake is in close contact with the iron plate cross, so that the coil is subjected to more uniform force during the pressing process, avoiding pressure concentration.

[0032] The working principle of this embodiment is the same as that of embodiment 1.

[0033] Example 4

[0034] This embodiment differs from Embodiment 3 in that it further includes a locking nut and a screw; the four protruding rods of the channel steel cross are respectively provided with through holes, and the edges of the upper pressure plate and the lower pressure plate are respectively provided with corresponding through holes; the screw passes through the through holes of the channel steel cross, the upper pressure plate and the lower pressure plate to connect the channel steel cross, the upper pressure plate and the lower pressure plate together; a baffle is provided at the lower end of the screw, and a locking nut is installed at the upper end.

[0035] The screw is used to connect the channel steel cross, the upper pressure plate and the lower pressure plate. The baffle plate set at the lower end of the screw is against the bottom surface of the lower pressure plate, and the locking nut is installed on the top surface of the channel steel cross. The locking nut is installed into the upper end of the screw on the top surface of the channel steel cross to press the coil to prevent the coil from loosening during the press-fitting process. After the upper pressure plate, spring device and locking device are installed above the coil, the screw is installed around the coil and the locking nut is tightened to form a whole, which is convenient for subsequent press-fitting and transportation.

[0036] The working principle of this embodiment is the same as that of embodiment 1.

[0037] Example 5

[0038] The difference between this embodiment and embodiment 4 is that the upper pressing plate and the lower pressing plate are circular. The upper pressing plate and the lower pressing plate are circular, which matches the shape of the coil and is convenient for positioning and pressing the coil.

[0039] The working principle of this embodiment is the same as that of embodiment 1.

[0040] Example 6

[0041] The difference between this embodiment and embodiment 5 is that a protective tube is provided on the bottom surface of each of the four extending rods of the iron plate cross. A protective tube is provided on the bottom surface of each of the four extending rods of the iron plate cross, and springs are installed in the protective tubes accordingly, so that the coil is evenly stressed during the press-fitting and drying process, preventing the coil from failing to meet the press-fitting requirements.

[0042] The working principle of this embodiment is the same as that of embodiment 1.

[0043] To summarize, the utility model clamps the coil by setting an upper pressure plate and a lower pressure plate, and compresses the spring through a hydraulic cylinder. When the coil dries out of the water and descends, the upper pressure plate descends, and the compressed spring extends outward by elastic force, continuously compressing the upper pressure plate, applying pressure to the coil, so that the coil is always in a compressed state, thereby making the coil tight and achieving the coil height required for production.

[0044] The foregoing descriptions of specific exemplary embodiments of the present invention are for the purpose of explanation and illustration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is obvious that many changes and variations can be made based on the above teachings. Although an embodiment of the present invention has been shown and described, this specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. The specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can make modifications, substitutions, variations and various selections and changes to the embodiments without creative contribution as needed after reading this specification without departing from the principles and purpose of the present invention, but they are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A coil pressing device with self-pressure, characterized in that: It includes a locking device, a spring device, an upper pressure plate, a lower pressure plate and a hydraulic system; the upper pressure plate and the lower pressure plate are arranged parallel to each other; a spring device is arranged above the upper pressure plate, and a locking device is arranged above the spring device; the spring device includes an iron plate cross, a protective tube and a spring; the iron plate cross is arranged horizontally above the upper pressure plate; the protective tube is arranged between the iron plate cross and the upper pressure plate; the spring is installed inside the protective tube; the hydraulic system includes a hydraulic cylinder; the hydraulic cylinder is installed on the top surface of the iron plate cross.

2. A coil pressing device with self-pressure according to claim 1, characterized in that: The locking device includes a locking bolt and a channel steel cross; the steel channel cross is installed above the iron plate cross; the locking bolt is arranged above the protective tube, the channel steel cross is provided with a threaded hole, the locking bolt is screwed into the threaded hole on the channel steel cross and pressed against the iron plate cross.

3. A coil pressing device with self-pressure according to claim 2, characterized in that: It also includes an iron pressure cake; the iron pressure cake is arranged between the steel groove cross and the iron plate cross; the iron pressure cake is arranged above the protective tube; the lower end of the locking bolt is against the top surface of the iron pressure cake, and the bottom surface of the iron pressure cake is tightly attached to the iron plate cross.

4. A coil pressing device with self-pressure according to claim 2, characterized in that: It also includes a locking nut and a screw; the four protruding rods of the channel steel cross are respectively provided with through holes, and the edges of the upper pressure plate and the lower pressure plate are respectively provided with corresponding through holes; the screw passes through the through holes of the channel steel cross, the upper pressure plate and the lower pressure plate to connect the channel steel cross, the upper pressure plate and the lower pressure plate together; a baffle is provided at the lower end of the screw, and a locking nut is installed at the upper end.

5. The coil pressing device with self-pressure according to claim 1, characterized in that: The upper pressing plate and the lower pressing plate are circular.

6. A coil pressing device with self-pressure according to claim 1, characterized in that: A protective tube is respectively arranged on the bottom surface of the four extending rods of the iron plate cross.

Images