A new fixture for coil assembly

Abstract

The application relates to the technical field of mechanical clamping tools, and discloses a novel clamp for coil mold closing, which comprises a strip-shaped plate, a clamping plate, a sleeve, a rotating rod and a protective cover. The clamping plate and the sleeve are arranged at the lower end of the strip-shaped plate, and a hollow area is arranged between the clamping plate and the sleeve to reduce the weight; the rotating rod is in threaded connection with the sleeve, and one end of the rotating rod is a clamping end opposite to the clamping plate; the protective cover is in closed or semi-closed space cooperation with the strip-shaped plate, and the sleeve and the rotating rod are partially covered in the protective cover, so that the protective cover can effectively prevent resin from polluting threads during pouring. The novel clamp is designed in a lightweight and integrated protective integrated mode, the problems of the traditional clamp, such as large volume, easy thread jamming and low installation efficiency, are solved, and the efficiency and reliability of mold closing operation are remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of mechanical clamping tools, and more specifically, to a novel clamp for coil mold closing. Background Technology

[0002] In the coil molding process, the outer mold is typically fixed using a C-shaped clamp (including a C-clamp and a screw). For example, patent CN216054269U discloses a positioning device for an air duct rod for dry-type transformer winding. The outer mold has a casting panel (i.e., a transformer tap changer) on its front side, and a clamping assembly on the front side of the casting panel. Under the action of the clamping assembly, the casting panel is clamped and fixed to the inside of the outer mold. The clamping assembly includes a U-shaped plate, a sleeve (i.e., a nut) fixed to one end of the U-shaped plate, and a rotating rod (i.e., a screw) threadedly connected to the sleeve. Another example is the C-clamp for a dry-type transformer winding casting mold disclosed in CN114147895A. These traditional clamps are bulky and large, resulting in time-consuming and labor-intensive handling and installation processes, requiring operators to frequently adjust the position, leading to low work efficiency. Furthermore, during epoxy resin pouring, dripping resin easily splashes onto the threaded surfaces of the screw and nut, which is difficult to clean after curing, causing thread jamming or component damage, resulting in a high product scrap rate. These problems increase production costs and restrict production efficiency and product quality. Therefore, there is an urgent need for a new type of mold clamping fixture that is lightweight, has protective functions, and is easy to install. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a new type of clamp for coil mold closing, which solves the problems of large size and weight, resin pollution risk and low installation efficiency of traditional clamps through structural optimization.

[0004] To achieve the above objectives, this utility model provides the following technical solution: A novel clamping fixture for coil mold closing includes: a strip plate, a clamping plate, a sleeve, a rotating rod, and a protective cover; the lower end of the strip plate is fixedly provided with the clamping plate and the sleeve at intervals along its length; the strip plate has a hollow area in the region between the clamping plate and the sleeve; the rotating rod is disposed at the end of the sleeve opposite to the clamping plate and is threadedly connected to the sleeve; the end of the rotating rod passing through the sleeve is a clamping end, which is directly opposite the clamping plate; the protective cover is disposed on the side wall of the strip plate, forming a closed or semi-closed space with the strip plate, and maintaining a first distance from the clamping plate; the sleeve and the rotating rod are partially disposed within the closed or semi-closed space; the hollow area is located between the clamping end and the clamping plate; the length of the first distance is greater than the opening width for forming the split panel after the outer mold of the horizontal casting mold for dry-type transformer coil is closed.

[0005] Furthermore, the clamping end is detachably connected with an end cap via a thread; the end cap maintains a distance from both the strip plate and the protective cover.

[0006] Furthermore, the end of the end cap facing the clamp is a closed end.

[0007] Furthermore, the hollowed-out area includes a through hole that runs vertically through the strip plate.

[0008] Furthermore, the through hole is a strip-shaped hole, and the length direction of the strip-shaped hole is the length direction of the strip plate.

[0009] Furthermore, the rotating rod includes a threaded rod and a rotating handle; the threaded rod is threadedly connected to the sleeve, one end of the threaded rod is the clamping end, and the other end is fixed perpendicularly to the rotating handle.

[0010] Furthermore, the sleeve includes at least one nut whose central axis is arranged along the length direction of the strip plate, and the thread engages with the threaded rod.

[0011] Furthermore, the protective cover includes protective plates disposed on both sides of the strip plate, and the nut and the end of the threaded rod near the rotating handle are disposed within the semi-enclosed space formed by the strip plate and the two protective plates.

[0012] The beneficial effects of this utility model are as follows: This utility model forms a physical isolation zone through a protective cover (the double-sided protective plates and the strip plate together form a "U"-shaped protective area, covering the three exposed surfaces of the threaded area), structurally blocking resin dripping into the threaded part, fundamentally solving the problem of thread jamming and extending the clamp's life. Since the end cap facing the clamping plate is a closed end, and the closed end structure can completely cover the clamping end thread, it prevents resin from seeping into the threaded rod from the end, forming double protection (side + end face), improving sealing reliability, and further blocking resin dripping into the threaded part. In addition, the end cap, as a detachable structure, prevents thread damage to the rotating rod during repeated use and avoids operator injury from sharp thread edges, improving safety. The end cap maintains a distance from surrounding components to ensure no mechanical interference with the protective cover or strip plate during clamping, ensuring smooth operation. The middle section of the strip plate is hollowed out, removing non-load-bearing material, achieving a balance between weight reduction and rigidity maintenance, facilitating handling without affecting the transmission of clamping force. The hollowed-out area features vertical through-holes penetrating the strip plate. This through-hole structure significantly reduces weight and facilitates the drainage of any resin or impurities that may accumulate during casting, preventing internal contamination. The clamping end is positioned directly opposite the clamping plate to ensure aligned clamping force lines, preventing uneven loading and improving mold closing stability. The rotating rod consists of a threaded rod and a vertically fixed rotating handle. The rotating handle provides the lever arm, allowing the operator to achieve a large clamping force with a small torque, saving effort and providing precise control. The sleeve includes at least one nut positioned along the length of the strip plate, which cooperates with the threaded rod. By using multiple nuts, the thread stress is distributed, preventing single-point fatigue and extending service life. The protective plates on both sides, together with the strip plate, form a semi-enclosed space. This semi-enclosed design both blocks resin and allows air circulation, aiding in heat dissipation from the threaded parts and facilitating observation of the internal condition. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0014] Figure 1 This is a three-dimensional structural schematic diagram of a novel clamping fixture for coil mold assembly provided by this utility model. Figure 2 This is a three-dimensional structural schematic diagram from another perspective of the novel clamping fixture for coil mold closing provided by this utility model; Figure 3 This is a schematic diagram of the structure of the novel clamping fixture for coil mold closing provided by this utility model when used for closing the outer mold of a horizontal casting mold for a dry-type transformer coil; Figure 4 for Figure 3 A structural diagram from another perspective.

[0015] Figure label: 100-New type of clamp; 1-Strip plate; 2-Clamping plate; 3-Sleeve; 4-Rotating rod; 41-Threaded rod; 42-Rotating handle; 5-Protective cover; 51-Semi-enclosed space; 6-Hollowed area; 7-End cap; 200-Horizontal casting mold for dry-type transformer coils. Detailed Implementation

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

[0017] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0018] It should be noted that the directional terms such as "upper," "middle," "lower," "inner," and "outer" used below are defined based on the accompanying drawings in the instruction manual.

[0019] Please refer to Figures 1 to 4 A novel clamp 100 for coil mold closing is particularly suitable for fixing and closing the outer mold in a horizontal casting mold 200 for dry-type transformer coils.

[0020] The new type of clamp 100 mainly includes a strip plate 1, a clamping plate 2, a sleeve 3, a rotating rod 4, and a protective cover 5.

[0021] The strip plate 1, serving as the main load-bearing component of the clamp, is typically made of high-strength steel plate or lightweight alloy plate to balance structural strength and lightweight requirements. At the lower end of the strip plate 1, clamping plates 2 and sleeves 3 are fixedly installed at intervals along its length. The clamping plate 2 is a flat plate perpendicularly connected to the strip plate 1, with a flat inner working surface for directly pressing the outer mold. In this embodiment, the sleeve 3 is preferably a nut welded and fixed to the strip plate 1, with its axis arranged along the length of the strip plate 1.

[0022] To significantly reduce the overall weight of the fixture while optimizing stress distribution while maintaining rigidity, a hollow area 6 is provided on the strip plate 1, located between the clamping plate 2 and the sleeve 3. This hollow area 6 is a vertical through-hole penetrating the strip plate 1. Preferably, this through-hole is designed as a strip-shaped hole, and its length direction is consistent with the length direction of the strip plate 1. The principle behind this design is that when the strip plate is under stress, its central area is the main stress-bearing path, and the strip-shaped hole is arranged along the stress direction, avoiding sharp holes on the critical stress path. This allows for weight reduction by removing redundant material while maximizing the bending stiffness of the component. In addition, this strip-shaped hole also provides a visual channel for the operator to easily observe the clamping alignment.

[0023] The rotating rod 4 is located at the end of the sleeve 3 facing away from the clamping plate 2 and is threadedly connected to the sleeve 3. The rotating rod 4 includes a threaded rod 41 and a rotating handle 42. The threaded rod 41 engages with the sleeve 3 (i.e., the nut), and one end of it is a clamping end for tightening the outer mold. This clamping end is positioned directly opposite the clamping plate 2 to ensure that the line of action of the clamping force passes through the center of the two clamping surfaces, avoiding the generation of eccentric torque. The rotating handle 42 is perpendicularly fixed to the other end of the threaded rod 41, forming a lever that saves effort. Through the lever arm amplification effect, the operator can generate a large axial clamping force with a small manual torque, which not only saves effort but also makes the control of the clamping force more precise.

[0024] One of the core improvements of this utility model lies in the provision of a protective cover 5. The protective cover 5 is fixedly installed on the side wall of the strip plate 1, and together with the strip plate 1, forms a closed or semi-closed space 51. Specifically, in this embodiment, the protective cover 5 includes two protective plates located on both sides of the strip plate 1, which together with the strip plate 1 form a U-shaped protective structure. The sleeve 3 (nut) and the end of the threaded rod 41 near the rotating handle 42 are both accommodated within this semi-closed space 51.

[0025] During epoxy resin pouring, the protective cover 5 forms a physical barrier. Even if resin droplets splash, they are blocked and diverted by the protective plate, preventing them from contacting the meshing threaded portion of the sleeve 3 and the threaded rod 41. This fundamentally solves the problem of thread jamming and component damage caused by resin curing, significantly reducing the scrap rate and maintenance costs due to contamination.

[0026] Furthermore, a first gap L is maintained between the protective cover 5 and the clamping plate 2. The design of this first gap L is crucial, as its length is greater than the opening width used for forming the taper panel after the outer mold of the dry-type transformer coil horizontal casting mold is closed. This design ensures that after the fixture is installed in place, the protective cover 5 will not interfere with other parts of the outer mold (such as the opening edge of the taper panel), thereby guaranteeing the versatility of the fixture and the smoothness of installation.

[0027] The working process of this embodiment is as follows: Position the clamping ends of the clamping plate 2 and the rotating rod 4 on either side of the outer mold to be clamped, aligning the hollowed-out area 6 on the strip plate 1 with the mold closing area for easy observation. Hold the rotating handle 42 and rotate the rotating rod 4; the clamping end extends forward, working in conjunction with the clamping plate 2 to firmly clamp the outer mold. Throughout the pouring process, the protective cover 5 effectively protects the internal threaded parts from resin contamination. After pouring, reverse the rotating handle 42 to release the clamp and easily remove it. The threaded parts remain clean and can be immediately reused.

[0028] To provide more comprehensive end protection, an end cap 7 is detachably threaded onto the clamping end of the rotating rod 4. The end cap 7 is preferably cup-shaped, with its end facing the clamping plate 2 being a closed end. After installation, the end cap 7 maintains a certain distance from both the strip plate 1 and the protective cover 5 to avoid mechanical interference during clamping.

[0029] The enclosed end cap 7 completely encloses the threads at the clamping end, forming an end-face seal for the threaded pair. Together with the side protective cover 5, it constitutes a comprehensive protective system, completely eliminating the possibility of resin intrusion from any direction. The end cap 7 is typically made of copper or mild steel, protecting the threads at the end of the rotating rod 4 from damage and preventing the hard threaded end from damaging the precision mold surface during clamping. As a consumable part, the end cap 7 can be easily replaced after wear without replacing the entire rotating rod, resulting in low maintenance costs.

[0030] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0031] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0032] The above provides a detailed description of a novel clamping fixture for coil mold assembly provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A new fixture for coil assembly, characterized in that, include: The system comprises a strip plate, a clamping plate, a sleeve, a rotating rod, and a protective cover. The lower end of the strip plate is fixedly provided with a clamping plate and a sleeve at intervals along its length. A hollow area is provided in the region between the clamping plate and the sleeve on the strip plate. The rotating rod is located at the end of the sleeve opposite to the clamping plate and is threadedly connected to the sleeve. The end of the rotating rod passing through the sleeve is a clamping end, which is directly opposite the clamping plate. The protective cover is located on the side wall of the strip plate, forming a closed or semi-closed space with the strip plate, and maintaining a first distance from the clamping plate. A portion of the sleeve and the rotating rod are located within the closed or semi-closed space. The hollow area is located between the clamping end and the clamping plate. The length of the first distance is greater than the opening width used for forming the split panel after the outer mold of the dry-type transformer coil horizontal casting mold is closed.

2. A novel fixture for coil assembly as claimed in claim 1, wherein, The clamping end is detachably connected to an end cap via a thread; the end cap maintains a distance from both the strip plate and the protective cover.

3. A novel fixture for coil assembly as claimed in claim 2, wherein, The end of the end cap that faces the clamp is the closed end.

4. A novel fixture for coil assembly as claimed in claim 1, wherein, The hollowed-out area includes a through hole that vertically penetrates the strip plate.

5. A novel fixture for coil assembly as claimed in claim 4, wherein, The through hole is a strip-shaped hole, and the length direction of the strip-shaped hole is the length direction of the strip plate.

6. A novel fixture for coil assembly as claimed in claim 1, wherein, The rotating rod includes a threaded rod and a rotating handle; the threaded rod is threadedly connected to the sleeve, one end of the threaded rod is the clamping end, and the other end is fixed perpendicularly to the rotating handle.

7. A novel fixture for coil assembly as claimed in claim 6 wherein, The sleeve includes at least one nut whose central axis is arranged along the length of the strip plate, and the thread engages with the threaded rod.

8. A novel clamping fixture for coil mold closing according to claim 7, characterized in that, The protective cover includes protective plates disposed on both sides of the strip plate, and the nut and the end of the threaded rod near the rotating handle are disposed within the semi-enclosed space formed by the strip plate and the two protective plates.

Images