Tool for pulling out magnetic pole key of generator

Abstract

The utility model relates to the technical field of motor maintenance tools, and provides a generator magnetic pole key pulling-out tool, which comprises a first clamping arm, a second clamping arm and a connecting seat, the middle parts of the first clamping arm and the second clamping arm are rotatably connected through a pin shaft, the connecting seat is provided with a sliding chute, and one end of the first clamping arm and one end of the second clamping arm are both limited in the sliding chute in a sliding manner. The connecting base is lifted to enable the first clamping arm and the second clamping arm to be close to the middle along the sliding groove so as to clamp and pull out the magnetic pole key, part of vertically upward lifting force is converted into transverse clamping force, stable clamping of the magnetic pole key is achieved, the structure is compact, the occupied space is small, operation convenience is improved, and clamping stability and safety are enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of motor repair tools, in particular to a generator magnetic pole key extraction tool. Background Art

[0002] The rotor of a hydroelectric generator at a hydropower station typically adopts a salient-pole structure, with the rotor core consisting of a yoke and magnetic poles. The outer circumference of the yoke is provided with T-shaped slots, and the magnetic poles are fixed to the yoke using T-shaped tenons. To ensure the secure attachment of the magnetic poles, pole keys are driven into the gaps in the T-slots. If an electrical fault such as insulation damage between the pole turns or a short circuit in the pole coil occurs, the pole keys must be removed first so that the poles can be lifted out for handling.

[0003] Current technology typically uses a vertical lifting clamp to clamp the upper end of the pole key and remove it using a bridge crane. However, due to the small spacing between the pole keys and the generally large size of the vertical lifting clamp, operation in confined spaces is difficult. Furthermore, when clamping the pole key, the vertical lifting clamp often collides with the pole coil, which can damage not only the clamp or coil but also the entire equipment, increasing the difficulty and risk of the operation.

[0004] In addition, the existing technology also uses a key extraction clamp and a jack to extract the pole key, but it is necessary to install a jack near the pole key to provide the necessary support. However, since the installation of the pole key is usually relatively compact and there are often other equipment around it (such as pole connection triangles, yoke clamping bolts, etc.), the space for installing the jack is limited. In addition, the rotor yoke is made up of a large number of stacked silicon steel sheets. When the jack is placed on the yoke, the reaction force generated by the key extraction clamp will be transmitted to the silicon steel sheets through the jack, causing the silicon steel sheets near the jack to bear much greater pressure than other areas, resulting in uneven force on the rotor yoke as a whole, which may cause the yoke clamping bolts to loosen, and even bring more serious consequences. Utility Model Content

[0005] The purpose of the utility model is to provide a generator pole key extraction tool to solve the above technical problems, with a compact structure, small space occupation, and enhanced clamping stability and safety.

[0006] The utility model is realized through the following technical solutions: a generator pole key extraction tool, comprising a first clamping arm, a second clamping arm and a connecting seat, the middle parts of the first clamping arm and the second clamping arm are rotatably connected by a pin shaft, the connecting seat is provided with a sliding groove, one end of the first clamping arm and the second clamping arm are both slidably limited in the sliding groove, and the connecting seat is lifted so that the first clamping arm and the second clamping arm are moved toward the middle along the sliding groove for clamping and extracting the pole key.

[0007] Furthermore, the inner wall of the slide groove is provided with a plurality of protrusions for guiding one end of the first clamping arm and the second clamping arm to slide unidirectionally toward the middle position of the slide groove.

[0008] Furthermore, a plurality of adjustment holes are vertically symmetrically provided on the connecting seat, and plug plates for limiting one end of the first clamping arm and the second clamping arm to slide toward the middle position of the sliding groove are respectively inserted into the symmetrical adjustment holes.

[0009] Furthermore, the first clamping arm is provided with an avoidance hole at the pin connection for avoiding the movement of the second clamping arm.

[0010] Furthermore, the first clamping arm and the second clamping arm each include a clamping portion and a connecting portion hinged to each other.

[0011] Furthermore, a connecting ring is provided at the center position of the top of the connecting seat.

[0012] Furthermore, the first clamping arm and the second clamping arm are provided with friction lines on their contact surfaces with the magnetic pole keys.

[0013] The utility model has at least the following advantages and beneficial effects:

[0014] (1) A sliding groove with high ends and low middle is provided in the connecting seat to limit the sliding of one end of the first clamping arm and the second clamping arm, and the connecting seat is lifted so that the first clamping arm and the second clamping arm can be retracted and firmly clamped to the magnetic pole key under the action of gravity. The structure is compact, the space occupied is small, and the convenience of operation is improved;

[0015] (2) By setting the protrusion on the inner wall of the slide groove, the first clamping arm and the second clamping arm can only slide in one direction along the slide groove to the middle position, maintaining a certain clamping force during the clamping process and not being easy to loosen, thereby enhancing the stability and safety of the clamping;

[0016] (3) Through the cooperation of the plug plate and the adjustment hole, the clamping distance can be adjusted to avoid excessive clamping and damage to the surface of the magnetic pole key. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a structural diagram of a generator pole key extraction tool provided by the utility model;

[0019] Figure 2 A cross-sectional view of a generator pole key extraction tool provided by the utility model;

[0020] Icon: 1-first clamping arm, 10-avoidance hole, 101-clamping part, 102-connecting part, 2-second clamping arm, 3-connecting seat, 30-slide groove, 31-protrusion, 32-adjustment hole, 33-connecting ring, 4-pin shaft, 5-insert plate, 6-friction pattern. DETAILED DESCRIPTION

[0021] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0023] Example

[0024] like Figure 1-2 As shown, in this embodiment, a generator pole key extraction tool is mainly disclosed, which has a compact structure, occupies a small space, and is suitable for clamping and extracting pole keys of different sizes. Its main structure includes a first clamping arm 1, a second clamping arm 2 and a connecting seat 3. The middle parts of the first clamping arm 1 and the second clamping arm 2 are rotatably connected by a pin shaft 4. The connecting seat 3 is provided with a slide groove 30. One end of the first clamping arm 1 and the second clamping arm 2 are both slidably limited in the slide groove 30. The connecting seat 3 is lifted to make the first clamping arm 1 and the second clamping arm 2 move toward the middle along the slide groove 30 for clamping and extracting the pole key; it should be noted that the first clamping arm 1 and the second clamping arm 2 use the pin shaft 4 as a hinge fulcrum to form a scissor structure. The first clamping arm 1 and the second One section of the clamping arm 2 is the force arm, and the other section is the resistance arm. The force arm ends of the first clamping arm 1 and the second clamping arm 2 are limited to slide in the slide groove 30; the slide groove 30 can be V-shaped, gradually converging vertically downward from the two ends to the middle, and the changing angle of convergence from the two ends of the slide groove to the middle can be adjusted according to the actual clamping force requirements to ensure that the magnetic pole key can be firmly clamped and smoothly pulled out; the connecting seat 3 is vertically lifted, so that the force arm ends of the first clamping arm 1 and the second clamping arm 2 are moved toward the middle position along the slide groove 30 under the action of gravity, thereby driving the resistance arm to stably clamp the magnetic pole key, and then pulling it upward, converting part of the vertical upward lifting force into a horizontal clamping force, thereby achieving firm clamping of the magnetic pole key.

[0025] Furthermore, in a specific implementation, the inner wall of the above-mentioned slide groove 30 provided in the embodiment of the present invention is provided with a plurality of protrusions 31 for guiding one end of the first clamping arm 1 and the second clamping arm 2 to slide unidirectionally toward the middle position of the slide groove 30; specifically, the protrusion 31 can be provided on the upper wall end surface and / or the lower wall end surface of the slide groove 30. In this embodiment, the protrusion 31 is provided on the lower wall end surface as an example. The protrusion 31 is stepped. The contact surface between the protrusion 31 and the end of the first clamping arm 1 and the second clamping arm 2 mainly includes an upper connecting surface and a vertical connecting surface. The upper connecting surface is arranged obliquely toward the middle position of the slide groove 30 to guide the first clamping arm 1 and the second The end of the clamping arm 2 slides toward the middle position of the slide groove 30, and the vertical connection surface is arranged vertically, which is used to prevent the ends of the first clamping arm 1 and the second clamping arm 2 from sliding toward the ends of the slide groove 30, thereby realizing one-way sliding, ensuring that the first clamping arm 1 and the second clamping arm 2 can only move toward the middle position during the clamping process, maintaining a certain clamping force that is not easy to loosen, thereby enhancing the stability and safety of the clamping; it should be noted that there is a certain fitting gap between the ends of the first clamping arm 1 and the second clamping arm 2 and the slide groove 30, and the first clamping arm 1 and the second clamping arm 2 can be restored to the initial position by applying additional external force.

[0026] When the first clamping arm 1 and the second clamping arm 2 are in the middle position of the sliding groove 30, the first clamping arm 1 and the second clamping arm 2 are in the middle position of the sliding groove 30. The first clamping arm 1 and the second clamping arm 2 are in the middle position of the sliding groove 30, and the first clamping arm 1 and the second clamping arm 2 are in the middle position of the sliding groove 30. The ...

[0027] Furthermore, in a specific implementation, the first clamping arm 1 provided in the embodiment of the present invention is provided with an avoidance hole 10 at the connection with the pin shaft 4 for avoiding the movement of the second clamping arm 2; specifically, the second clamping arm 2 passes through the avoidance hole 10 to form a cross structure, and the pin shaft 4 is connected at the intersection position, so that the ends of the first clamping arm 1 and the second clamping arm 2 are located on the same vertical plane, thereby improving the stability of the clamping. In addition, the hole wall of the avoidance hole 10 also constitutes the active boundary of the cross rotation of the first clamping arm 1 and the second clamping arm 2, which plays a limiting role.

[0028] Furthermore, in a specific implementation, the above-mentioned first clamping arm 1 and second clamping arm 2 provided in the embodiment of the present invention both include a clamping portion 101 and a connecting portion 102 that are hinged to each other; specifically, the clamping portion 101 of the first clamping arm 1 and the second clamping arm 2 constitute a scissor-type clamping structure, one end of the connecting portion 102 is hinged to the end of the clamping portion 101, and the other end is rotatably connected to a roller, so that the roller is limited in movement within the slide groove 30, and the rotation of the roller provides lubrication to reduce friction between it and the inner wall of the slide groove 30.

[0029] Furthermore, in a specific implementation, a connecting ring 33 is provided at the top center position of the above-mentioned connecting seat 3 provided in the embodiment of the utility model, which provides a convenient hanging point for connecting to an existing bridge crane for lifting.

[0030] Furthermore, in specific implementation, the first clamping arm 1 and the second clamping arm 2 provided in the embodiment of the present invention are provided with friction grooves 6 on the contact surface with the magnetic pole key, which increases the static friction force, effectively prevents the relative sliding between the first clamping arm 1 and the second clamping arm 2 and the magnetic pole key, significantly improves the success rate of pulling out the magnetic pole key, makes the operation simpler and more efficient, and reduces the risk of sliding and accidental falling off.

[0031] The above are merely preferred embodiments of the present invention and are 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 generator pole key extraction tool, characterized in that: The invention comprises a first clamping arm (1), a second clamping arm (2) and a connecting seat (3), wherein the middle parts of the first clamping arm (1) and the second clamping arm (2) are rotatably connected via a pin shaft (4), and the connecting seat (3) is provided with a slide groove (30), and one end of the first clamping arm (1) and the second clamping arm (2) are both slidably limited in the slide groove (30), and the connecting seat (3) is lifted so that the first clamping arm (1) and the second clamping arm (2) are moved toward the middle along the slide groove (30) for clamping and extracting the magnetic pole key.

2. A generator pole key extraction tool according to claim 1, characterized in that: The inner wall of the slide groove (30) is provided with a plurality of protrusions (31) for guiding one end of the first clamping arm (1) and one end of the second clamping arm (2) to slide unidirectionally toward the middle position of the slide groove (30).

3. A generator pole key extraction tool according to claim 1, characterized in that: A plurality of adjustment holes (32) are vertically symmetrically provided on the connecting seat (3), and inserting plates (5) for limiting one end of the first clamping arm (1) and the second clamping arm (2) to slide toward the middle position of the sliding groove (30) are respectively inserted into the symmetrical adjustment holes (32).

4. A generator pole key extraction tool as claimed in claim 1, characterized in that: The first clamping arm (1) is provided with an avoidance hole (10) at the connection position of the pin shaft (4) for avoiding the movement of the second clamping arm (2).

5. A generator pole key extraction tool as claimed in claim 1, characterized in that: The first clamping arm (1) and the second clamping arm (2) both comprise a clamping portion (101) and a connecting portion (102) that are hinged to each other.

6. A generator pole key extraction tool as claimed in claim 1, characterized in that: A connecting ring (33) is provided at the center of the top of the connecting seat (3).

7. A generator pole key extraction tool as claimed in claim 1, characterized in that: The first clamping arm (1) and the second clamping arm (2) are provided with friction lines (6) on their contact surfaces with the magnetic pole keys.

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