Pressing tool for low-voltage coil of dry-type transformer

Abstract

This utility model relates to the field of transformer press-fitting, and provides a press-fitting fixture for the low-voltage coil of a dry-type transformer. The fixture includes a press-fitting frame, a base plate for placing the coil assembly, two upwardly extending support arms on both sides of the base plate, an upper pressure plate rotatably connected to the upper end of one support arm, a press mounted on the upper pressure plate, and a limiting part for limiting the upper pressure plate on the other support arm. A press-fitting control device, mounted on the press-fitting frame, includes a control module, a pressure detection module, and a dimension detection module. The pressure detection module detects the pressure output by the press, the dimension detection module detects the dimensions of the coil assembly, and the control module controls the start and stop of the press based on the detection data from the pressure and dimension detection modules. A fixing device includes an upper fixing plate, a lower fixing plate, and two screws. The space between the two screws is for placing the coil assembly, and nuts are fitted at the upper ends of the screws to limit the upper fixing plate. The coil assembly is located between the upper and lower fixing plates. This design solves the problems of high labor intensity and low press-fitting efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of transformer press-fitting, specifically to a press-fitting fixture for the low-voltage coil of a dry-type transformer. Background Technology

[0002] After the low-voltage coil of a dry-type transformer is wound, it needs to be press-fitted to form a tight and stable integral structure. The quality of the press-fitting directly affects the coil's resistance to deformation during the subsequent baking and curing process: if the press-fitting is insufficient, the gaps between coil layers will be too large, and the shrinkage of the insulating resin during baking can easily lead to loosening or local deformation of the coil, thereby reducing the insulation strength or even causing a short circuit; while uniform press-fitting ensures that the coil has high mechanical strength and precise dimensions after curing, meeting the reliability requirements for long-term operation. Therefore, optimizing the press-fitting process is crucial to improving transformer performance.

[0003] Currently, the pressing of low-voltage coils is mostly done manually with simple tooling. Specifically, the operator places the coil on a support platform, which is equipped with a manual screw mechanism. The coil is placed inside the manual screw mechanism, and pressure is applied to the coil by manually tightening the screw, thereby achieving the pressing and shaping of the coil. This method has significant drawbacks: (1) The labor intensity is high when applying pressure by manually tightening the screw; (2) The screw mechanism is prone to fatigue. During use, uneven force can easily cause deformation of the screw mechanism, resulting in uneven force on the coil, non-standard pressing, and even bolt popping out of the screw mechanism, causing safety accidents; (3) The pressing process and quality depend on the worker's experience, and pressing quality problems can easily occur due to excessive or insufficient pressure. Summary of the Invention

[0004] The present invention aims to provide a pressing tool for the low-voltage coil of a dry-type transformer to solve the problems of high labor intensity and low pressing efficiency in the prior art.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: a pressing fixture for the low-voltage coil of a dry-type transformer, comprising...

[0006] The pressing frame includes a base plate for placing coil assemblies, two upwardly extending support arms on both sides of the base plate, an upper pressure plate rotatably connected to the upper end of one support arm, a press is mounted on the upper pressure plate, and a limiting part for limiting the upper pressure plate is provided on the other support arm.

[0007] A press-fitting control device is installed on the press-fitting frame and includes a control module, a pressure detection module, and a dimension detection module. The pressure detection module, dimension detection module, press, and control module are electrically connected. The pressure detection module is used to detect the pressure output by the press, and the dimension detection module is used to detect the size of the coil group. The control module is used to control the start and stop of the press based on the detection data from the pressure detection module and the dimension detection module.

[0008] The fixing device includes a lower fixing plate, on which two screws are provided, and a space for placing a coil assembly is provided between the two screws. An upper fixing plate is fitted on the screws, and a nut is fitted at the upper end of the screws to limit the upper fixing plate. The coil assembly is located between the upper and lower fixing plates.

[0009] Preferably, the press-fitting control device further includes a display module, which is used to display real-time pressure and coil group size.

[0010] Preferably, the upper part of the support arm connected to the upper pressure plate is provided with a pin, and the upper pressure plate is provided with a mounting hole, through which the upper pressure plate is mounted on the pin.

[0011] More preferably, the upper pressure plate is mounted on the pin shaft via a bearing, wherein the inner ring of the bearing is interference-fitted with the pin shaft, and the outer ring of the bearing is interference-fitted with the wall of the mounting hole.

[0012] Preferably, the pressing frame further includes a pad, and the lower part of the two support arms is symmetrically provided with pad placement holes for placing the pad.

[0013] Preferably, the control module includes a detection data monitoring module, which compares the detection data from the pressure detection module and the size detection module with preset limits, and controls the start and stop of the press based on the comparison results.

[0014] More preferably, the press-fitting control device further includes a key input module, which is electrically connected to the control module and is used to allow operators to adjust the limit values ​​corresponding to the pressure detection value and the size detection value.

[0015] In another preferred embodiment, the pressing control device further includes a wireless communication module electrically connected to the control module. The wireless communication module is connected to the control center network and is used to upload pressing data to the control center.

[0016] Preferably, it also includes a lifting device for transferring the coil assembly onto the pressing frame.

[0017] The working principle and beneficial effects of this utility model are as follows: During pressing, the upper pressure plate first rotates outward to facilitate the lifting device placing the coil assembly on the pressing frame. After the coil assembly is placed, the upper pressure plate rotates inward so that the press is positioned above the coil assembly. The pressing control device controls the press to start and apply pressure to the coil assembly. During the pressing process, the pressure detection module and the size detection module respectively detect the pressure applied by the press and the size of the coil assembly in real time. The control module compares the detected values ​​with preset limits to control the start and stop of the press. Specifically, the size of the coil assembly is monitored during the pressing process. When the size reaches the preset limit, it indicates that the pressing is complete, and the press is stopped. The pressure is detected in real time to ensure that the pressure output by the press is within the limit and stable, avoiding excessive pressure that could damage the coil. At the same time, the pressure level is used to further determine whether the pressing is in place.

[0018] 1. The upper pressure plate is rotatably connected by a support arm. With the limiting part of the other support arm, the upper pressure plate is equipped with a press. The press can be automatically controlled to start and stop through the press control device. Compared with the existing technology, it greatly reduces labor intensity and has high press efficiency.

[0019] 2. The press-fitting control device monitors the pressure output by the press and the size of the coil group in real time during the press-fitting process. When the detected data reaches the limit value, it automatically controls the press to stop to ensure the press-fitting quality of the coil group.

[0020] 3. Use a fixing device to position and fix the coil assembly after pressing, so as to facilitate baking. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the press-fitting frame of this utility model;

[0023] Figure 3 This is the control logic diagram of the press-fit control device of this utility model.

[0024] The markings in the accompanying drawings include: press frame 1, base plate 11, support arm 12, upper pressure plate 13, limiting part 14, pin shaft 121, press 2, control module 3, fixing device 4, screw 41, upper fixing plate 42, lower fixing plate 43, coil group 5, pad 6, pad placement hole 15. Detailed Implementation

[0025] The following detailed description illustrates the specific implementation method:

[0026] See Figures 1 to 3 A pressing fixture for the low-voltage coil of a dry-type transformer, comprising:

[0027] The pressing frame 1 includes a base plate 11 for placing the coil assembly 5. Two upwardly extending support arms 12 are provided on both sides of the base plate 11. An upper pressure plate 13 is rotatably connected to the upper end of one support arm 12. A press 2 is mounted on the upper pressure plate 13. The other support arm 12 has a limiting part 14 that limits the movement of the upper pressure plate 13. A pin 121 is provided on the upper part of the support arm 12 connected to the upper pressure plate 13. The upper pressure plate 13 has mounting holes, and the upper pressure plate 13 is mounted on the pin 121 through the mounting holes. The upper pressure plate 13 and the pin 121 can be clearance-fitted or connected via a bearing to achieve rotation. In this embodiment, the upper pressure plate 13 is mounted on the pin 121 via a bearing. The inner ring of the bearing is interference-fitted with the pin 121, and the outer ring of the bearing is interference-fitted with the wall of the mounting hole. The pressing frame 1 also includes a pad 6. The lower parts of the two support arms 12 are symmetrically provided with pad placement holes 15 for placing the pads. There are multiple sets of pad placement holes 15; in this embodiment, there are two sets. The placement position of the pads 15 can be adjusted to accommodate the pressing of different models of coil groups 5. The press 2 includes a body and a press head. The body is fixedly connected to the lower end face of the upper press plate 13, and the press head extends downwards. The press 2 can be a hydraulic press or a pneumatic press; in this embodiment, a YE27 series single-column hydraulic press is used.

[0028] A press-fitting control device, mounted on the press-fitting frame 1, includes a control module 3, a pressure detection module, and a dimension detection module. The pressure detection module, dimension detection module, and press 2 are electrically connected to the control module 3. The pressure detection module detects the output pressure of the press 2, and the dimension detection module detects the dimensions of the coil assembly 5. The control module 3 controls the start and stop of the press 2 based on the detection data from the pressure detection module and the dimension detection module. The press-fitting control device also includes a key input module, electrically connected to the control module 3, for allowing operators to adjust the limits corresponding to the pressure and dimension detection values. The control module 3 includes a detection data monitoring module, which compares the detection data from the pressure and dimension detection modules with preset limits and controls the start and stop of the press 2 based on the comparison results. The press-fitting control device also includes a wireless communication module electrically connected to the control module 3. This wireless communication module is connected to the control center network for uploading press-fitting data to the control center.

[0029] The pressure detection module includes a hydraulic pressure transmitter, model HYDAC HDA 4400-A-100-000, which is installed in the oil inlet or return line of the hydraulic cylinder of press 2; the size detection module includes a laser displacement sensor, model KEYENCE IL-1000, which is installed on the lower end face of the upper pressure plate 13, and confirms the size of the coil group 5 by detecting the distance between the upper pressure plate 13 and the upper end face of the coil group 5.

[0030] The fixing device 4 includes a lower fixing plate 43, on which two screws 41 are provided. A space for placing the coil group 5 is provided between the two screws 41. An upper fixing plate 42 is sleeved on the screws 41. A nut is fitted on the upper end of the screws 41 to limit the upper fixing plate 42. The coil group 5 is located between the upper and lower fixing plates.

[0031] It also includes a hoisting device for transferring the coil assembly 5 onto the pressing frame 1.

[0032] Preferably, the press-fitting control device further includes a display module, which is used to display the real-time pressure and the dimensions of the coil group 5.

[0033] Preferably, the coil group 5 comprises multiple coils, with partitions separating each coil from the upper and lower pressure plates to ensure uniform force distribution during coil pressing. The fixing device 4 secures the multiple coils for easy baking. In this embodiment, the coil group 5 includes three coils.

[0034] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A pressing fixture for the low-voltage coil of a dry-type transformer, characterized in that: include The pressing frame includes a base plate for placing coil assemblies, two upwardly extending support arms on both sides of the base plate, an upper pressure plate rotatably connected to the upper end of one support arm, a press is mounted on the upper pressure plate, and a limiting part for limiting the upper pressure plate is provided on the other support arm. A press-fitting control device is installed on the press-fitting frame and includes a control module, a pressure detection module, and a dimension detection module. The pressure detection module, dimension detection module, press, and control module are electrically connected. The pressure detection module is used to detect the pressure output by the press, and the dimension detection module is used to detect the dimension of the coil group. The control module is used to control the start and stop of the press based on the detection data from the pressure detection module and the dimension detection module. The fixing device includes a lower fixing plate, on which two screws are provided, and a space for placing a coil assembly is provided between the two screws. An upper fixing plate is fitted on the screws, and a nut is fitted at the upper end of the screws to limit the upper fixing plate. The coil assembly is located between the upper and lower fixing plates.

2. The press-fitting fixture for the low-voltage coil of a dry-type transformer according to claim 1, characterized in that: The press-fitting control device also includes a display module, which is used to display real-time pressure and coil group dimensions.

3. The press-fitting fixture for the low-voltage coil of a dry-type transformer according to claim 1, characterized in that: The upper part of the support arm connected to the upper pressure plate is provided with a pin, and the upper pressure plate is provided with a mounting hole, through which the upper pressure plate is mounted on the pin.

4. The press-fitting fixture for the low-voltage coil of a dry-type transformer according to claim 3, characterized in that: The upper pressure plate is mounted on the pin shaft via a bearing. The inner ring of the bearing is interference-fitted with the pin shaft, and the outer ring of the bearing is interference-fitted with the wall of the mounting hole.

5. The press-fitting fixture for the low-voltage coil of a dry-type transformer according to claim 1, characterized in that: The pressing frame also includes a pad, and the lower part of the two support arms is symmetrically provided with pad placement holes for placing the pad.

6. The press-fitting fixture for the low-voltage coil of a dry-type transformer according to claim 1, characterized in that: The control module includes a detection data monitoring module, which compares the detection data from the pressure detection module and the size detection module with preset limits, and controls the start and stop of the press based on the comparison results.

7. The press-fitting fixture for the low-voltage coil of a dry-type transformer according to claim 6, characterized in that: The press-fitting control device also includes a key input module, which is electrically connected to the control module and is used to allow operators to adjust the limit values ​​corresponding to the pressure detection value and the size detection value.

8. The press-fitting fixture for the low-voltage coil of a dry-type transformer according to claim 7, characterized in that: The press-fit control device also includes a wireless communication module electrically connected to the control module. The wireless communication module is connected to the control center network and is used to upload press-fit data to the control center.

9. The press-fitting fixture for the low-voltage coil of a dry-type transformer according to claim 1, characterized in that: It also includes a hoisting device for transferring the coil assembly onto the press frame.

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