A key puller for a generator magnetic pole

Abstract

A generator pole key removal tool, belonging to the technical field of generator maintenance tools, includes a connecting joint, a connecting rod, and a hammer. The connecting joint includes a threaded end and a welded end, the welded end being a solid flat surface. One end of the connecting rod is threadedly connected to the threaded end of the connecting joint, and the other end is provided with a limiting component. The hammer is slidably sleeved outside the connecting rod and located between the connecting joint and the limiting component. The threaded end of the connecting joint is used to connect the connecting rod, and the welded end is used to connect the pole key. When the key removal operation is required, the operator only needs to hold the hammer and move it from bottom to top. The impact force generated by the hammer striking the limiting component causes the connecting rod to generate an upward pulling force, thereby gradually pulling out the pole key at the bottom of the connecting joint. This solution only requires the reciprocating sliding of the hammer to strike the limiting component to remove the pole key, making the method very simple and greatly improving the efficiency of key removal.

Description

Technical Field

[0001] This utility model relates to a tool for removing the magnetic pole key of a generator. More specifically, it relates to a tool for removing the magnetic pole key of a generator. Background Technology

[0002] In generators, rotor poles are mostly fixed by using pole keys, and the removal and installation of pole keys requires the use of pole key removal tools. Most existing pole key removal tools are very complex in structure, which increases both the cost of the tools and the difficulty of the removal operation.

[0003] For example, Chinese Patent Publication No. CN214314966U, published on September 28, 2021, discloses a utility model entitled "Device for Pulling Out the Magnetic Key of a Water Turbine Motor Rotor." This application discloses a magnetic key pulling tool, comprising: a connecting assembly for transmitting the force required to pull out the magnetic key; the connecting assembly includes a connector and a support plate, one end of the connector being connected to the middle of the support plate and perpendicular to the support plate, forming a T-shape; and a driving component for providing the force required to pull out the magnetic key, the driving component being a pair of jacks symmetrically arranged on both sides of the connecting assembly, with their output ends abutting against the end of the support plate. Compared to directly striking short keys, this solution offers higher extraction efficiency. Furthermore, compared to using a puller to directly pull out long keys, this magnetic key pulling device does not require additional motor positioning, making operation simpler. However, the structure of this key pulling tool is quite complex, requiring precise symmetrical arrangement of the jacks during use, increasing the number of operational steps and difficulty. Utility Model Content

[0004] This invention overcomes the problems of complex structure and difficult use of existing magnetic pole key removal tools, and provides a generator magnetic pole key removal tool. This solution has a simple structure and uses a tapping method to indirectly and slowly release the magnetic pole key from the wedge-tight position, which can efficiently remove the magnetic pole key.

[0005] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: a generator pole key removal tool, including a connecting head, a connecting rod, and a hammer; the connecting head includes a threaded end and a welded end, the welded end being a solid plane; one end of the connecting rod is threadedly connected to the threaded end of the connecting head, and the other end is provided with a limiting member; the hammer is slidably sleeved on the outside of the connecting rod and located between the connecting head and the limiting member. The threaded end of the connecting head is used to connect the connecting rod, and the welded end is used to connect the pole key. The hammer can slide on the connecting rod. When the key removal operation is required, the operator only needs to hold the hammer and move it from bottom to top. The impact force generated by the hammer striking the limiting member causes the connecting rod to generate an upward pulling force, thereby applying an upward impact force to the connecting head and gradually pulling out the pole key at the bottom of the connecting head. This solution only requires the reciprocating sliding of the hammer to strike the limiting member to remove the pole key, making the method very simple and greatly improving the efficiency of key removal.

[0006] Preferably, the limiting member is a nut, which is threadedly connected to the connecting rod. Using a nut as the limiting member not only facilitates connection with the connecting rod but also facilitates disassembly and replacement of the limiting member.

[0007] Preferably, the length of the connecting rod is 0.5m to 1m. In this design, a manually reciprocating hammer is used to strike the limiting component. To allow the hammer to achieve a greater speed, the connecting rod can be designed to be slightly longer.

[0008] Preferably, the hammer has an annular groove on its outer periphery. The annular groove on the outer periphery of the hammer makes it easier for the operator to grip the hammer and prevents it from slipping.

[0009] Preferably, the connecting rod has a lifting ring at the end away from the connecting joint, and the lifting ring is threadedly connected to the connecting rod. The lifting ring can also serve as another method for removing the magnetic key. When the magnetic key is stuck very tightly and it is difficult to knock it out with a hammer, a crane can be used to hook the lifting ring and pull out the magnetic key.

[0010] Preferably, the lifting ring is located on the side of the limiting member away from the connecting joint. In order not to affect the installation of the lifting ring, a thread is provided on the side of the limiting member away from the connecting joint and on the connecting rod to reserve space for the installation of the lifting ring. This will not affect the initial attempt to strike the limiting member, and can also provide space for the subsequent placement of the lifting ring.

[0011] Preferably, an elastic element is fixed on the side of the hammer away from the limiting member, and the elastic element is coaxially arranged with the hammer. The elastic element can generate a spring force on the hammer, so that the hammer strikes the limiting member under the reaction force of the elastic element. This can completely eliminate the radial force generated when the hammer slides on the connecting rod, which would cause damage to the welding surface of the connecting rod and the magnetic pole key.

[0012] Preferably, the elastic element is a circular spring, and its inner diameter is larger than the outer diameter of the connecting joint and the magnetic pole key. The inner diameter of the elastic element needs to be larger than the outer diameters of the connecting joint and the magnetic pole key so that one end of the elastic element is connected to the bottom of the hammer, and the other end can abut against the rotor support wall or the end face of the magnetic yoke inside the generator. This way, the elastic element will not exert pressure on the magnetic pole key when compressed.

[0013] Preferably, the length of the connecting rod is 0.2m to 0.3m. The length of the connecting rod can be designed to be shorter, which on the one hand makes the overall size of the key-pulling tool smaller and easier to use, and on the other hand allows the hammer to have a greater striking speed, ensuring the striking effect.

[0014] Preferably, the axial length of the elastic element is greater than the axial length of the connecting joint. The length of the elastic element needs to be greater than the length of the connecting joint in its natural state to ensure that the elastic element can apply the elastic force generated by the compression deformation to the hammer, causing the hammer to strike the limiting element.

[0015] Compared with the prior art, the advantages of this utility model are: (1) the magnetic pole key can be pulled out by simply sliding the hammer back and forth to strike the limiting part. The method of use is very simple and can greatly improve the efficiency of key pulling; (2) it can also eliminate the radial force generated by the hammer when the connecting rod slides, and avoid damage to the welding surface of the connecting rod and the magnetic pole key; (3) the structure is simple, the manufacturing cost is reduced, and it is easy to maintain. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of Embodiment 1 of the present utility model.

[0017] Figure 2 This is a schematic diagram of Embodiment 2 of the present invention.

[0018] Figure 3 This is a schematic diagram of Embodiment 3 of the present invention.

[0019] In the figure: 1. Connecting joint, 1.1. Screw end, 1.2. Welding end, 2. Connecting rod, 3. Limiting component, 4. Hand hammer, 4.1. Annular groove, 5. Lifting ring, 6. Elastic component, 7. Magnetic pole key, 8. Magnetic pole and upper end face of magnetic yoke. Detailed Implementation

[0020] The technical solution of this utility model will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0021] Example 1: As Figure 1The illustrated generator pole key removal tool includes a connecting connector 1, a connecting rod 2, a hammer 4, and a limiting member 3. It should be noted that the pole key 7 is a mechanical connector embedded between the magnetic pole and the yoke. In this embodiment, the pole key 7 is described as being positioned between the magnetic pole and the yoke within a hydroelectric generator.

[0022] Specifically, the connecting joint 1 is a cylindrical component. One end of the connecting joint 1 is a threaded end 1.1, and the other end is a welded end 1.2. The threaded end 1.1 of the connecting joint 1 can be threaded to the connecting rod 2, so that the connecting rod 2 and the connecting joint 1 are connected as a whole. The welded end 1.2 of the connecting joint 1 is a flat surface, which can be welded to the end face of the magnetic pole key 7 located outside the magnetic pole and the magnetic yoke, so that the connecting joint 1 and the magnetic pole key 7 are fixed together. In this way, the connecting rod 2 and the magnetic pole key 7 are connected together through the connecting joint 1.

[0023] Furthermore, a hand hammer 4 is also provided on the outside of the connecting rod 2. Both the hand hammer 4 and the connecting rod 2 are cylindrical structures, and the inside of the hand hammer 4 is a hollow cylinder. The hand hammer 4 is sleeved on the outside of the connecting rod 2 and forms a sliding connection. That is to say, the hollow inner wall of the hand hammer 4 and the outside of the connecting rod 2 are in clearance fit, and the hand hammer 4 can slide freely on the outside of the connecting rod 2.

[0024] Furthermore, a limiting member 3 is provided at the end of the connecting rod 2 away from the connecting joint 1, and the limiting member 3 is relatively fixed to the connecting rod 2. Thus, the connecting joint 1 and the limiting member 3 are located at opposite ends of the connecting rod 2, while the hammer 4 is positioned between the connecting joint 1 and the limiting member 3. Since the hammer 4 can slide freely on the connecting rod 2, and the connecting rod 2, connecting joint 1, magnetic pole key 7, and limiting member 3 are all relatively fixed, when the hammer 4 is moved so that it slides on the connecting rod 2 towards the limiting member 3, the hammer 4 will strike the limiting member 3. The impact force generated by the hammer 4 striking the limiting member 3 causes the connecting rod 2 to briefly experience a force away from the connecting joint 1. In other words, the magnetic pole key 7 will also experience a force away from the interaction between the magnetic pole and the yoke. By repeatedly sliding the hammer 4 to strike the limiting member 3, the magnetic pole key 7 can eventually be gradually disengaged from the mating surface between the magnetic pole and the yoke.

[0025] Specifically, in this embodiment, the radial dimension of the connecting joint 1 is larger than the radial dimension of the magnetic key 7. The axial end face of the connecting joint 1 and the axial end face of the magnetic key 7 abut together, and then they are fixed together by welding. On the other hand, using a connecting joint 1 with a larger radial dimension can ensure a larger weld area between the connecting joint 1 and the magnetic key 7 (when the radial dimension of the connecting joint 1 is larger, the weld area depends on the radial dimension of the magnetic key 7), ensuring the welding strength or connection strength between the connecting joint 1 and the magnetic key 7. Furthermore, the end face abutment welding between the connecting joint 1 and the magnetic key 7 is beneficial to improving the strength of the weld surface under tensile load, and also facilitates the subsequent separation between the connecting joint 1 and the magnetic key 7.

[0026] Specifically, in this embodiment, the threaded end 1.1 of the connecting head 1 uses an internal thread, while the connecting end of the connecting rod 2 and the connecting head 1 uses an external thread. In this case, the radial dimension of the connecting head 1 is larger than the radial dimension of the connecting rod 2. Alternatively, the threaded end 1.1 of the connecting head 1 can also use an external thread, while the connecting end of the connecting rod 2 and the connecting head 1 can use an internal thread. In this case, the radial dimension of the connecting head 1 is smaller than the radial dimension of the connecting rod 2. Both of these threaded connection methods can achieve an effective connection between the connecting rod 2 and the connecting head 1. Furthermore, to ensure the connection strength between the connecting rod 2 and the connecting head 1, the threaded connection length between the connecting rod 2 and the connecting head 1 is 5 ± 1 cm.

[0027] Specifically, in this embodiment, the hammer 4 and the connecting rod 2 are clearance-fitted. The limiting member 3 is located on the side of the hammer 4 away from the connecting joint 1. To ensure that the hammer 4 can effectively strike the limiting member 3 during sliding, the radial dimension of the limiting member 3 needs to be larger than the radial dimension of the hollow column inside the hammer 4. Furthermore, in this embodiment, the limiting member 3 adopts a nut structure, with an external thread at the end of the connecting rod 2 away from the connecting joint 1. This facilitates the installation of the limiting member 3 on the connecting rod 2, ensuring the connection strength between the limiting member 3 and the connecting rod 2, and also facilitating the disassembly of the limiting member 3 from the connecting rod 2.

[0028] Specifically, in this embodiment, the length of the hammer 4 is set to 12 to 15 cm; the hammer 4 has an annular groove 4.1 on its outer side, and the length of the annular groove 4.1 along the axial direction of the hammer 4 is set to 8 to 10 cm to better accommodate the size of the operator's hand. In addition, the two ends of the annular groove 4.1 on the outer side of the hammer 4 are rounded, which can eliminate stress concentration between the two ends of the annular groove 4.1 and the hammer 4, and also provides better protection for the operator's hand.

[0029] Furthermore, in this embodiment, the length of the connecting rod 2 is set to 0.5m. Since the power of the hammer 4 is applied by the operator, the movement speed of the hammer 4 gradually increases under the operator's operation. In order to ensure that the hammer 4 has a large striking speed when striking the limiting member 3, the length of the connecting rod 2 also needs to be set longer so that the hammer 4 can obtain a longer acceleration time, thereby obtaining a larger striking speed.

[0030] Furthermore, it should be noted that since the connecting head 1 and the magnetic key 7 are fixed by end-face welding, in order to reduce the radial force generated by the hammer 4 during the sliding process and avoid damage to the connection between the connecting head 1 and the magnetic key 7, the magnetic key 7 should be positioned vertically when using the key-pulling tool. This ensures that the connecting rod 2, connecting head 1, and other structures are all placed vertically. When moving the hammer 4, the radial force generated by the hammer 4 on the connecting rod 2 can be minimized as much as possible, thus avoiding damage to the magnetic key 7 and the connecting head 1.

[0031] Example 2: Figure 1 and Figure 2 The illustrated generator pole key removal tool includes a connecting connector 1, a connecting rod 2, a hammer 4, and a limiting member 3. It should be noted that the pole key 7 is a mechanical connector embedded between the magnetic pole and the yoke. In this embodiment, the pole key 7 is described as being positioned between the magnetic pole and the yoke within a hydroelectric generator.

[0032] Specifically, the connecting joint 1 is a cylindrical component. One end of the connecting joint 1 is a threaded end 1.1, and the other end is a welded end 1.2. The threaded end 1.1 of the connecting joint 1 can be threaded to the connecting rod 2, so that the connecting rod 2 and the connecting joint 1 are connected as a whole. The welded end 1.2 of the connecting joint 1 is a flat surface, which can be welded to the end face of the magnetic pole key 7 located outside the magnetic pole and the magnetic yoke, so that the connecting joint 1 and the magnetic pole key 7 are fixed together. In this way, the connecting rod 2 and the magnetic pole key 7 are connected together through the connecting joint 1.

[0033] Furthermore, a hand hammer 4 is also provided on the outside of the connecting rod 2. Both the hand hammer 4 and the connecting rod 2 are cylindrical structures, and the inside of the hand hammer 4 is a hollow cylinder. The hand hammer 4 is sleeved on the outside of the connecting rod 2 and forms a sliding connection. That is to say, the hollow inner wall of the hand hammer 4 and the outside of the connecting rod 2 are in clearance fit, and the hand hammer 4 can slide freely on the outside of the connecting rod 2.

[0034] Furthermore, a limiting member 3 is provided at the end of the connecting rod 2 away from the connecting joint 1, and the limiting member 3 is relatively fixed to the connecting rod 2. Thus, the connecting joint 1 and the limiting member 3 are located at opposite ends of the connecting rod 2, while the hammer 4 is positioned between the connecting joint 1 and the limiting member 3. Since the hammer 4 can slide freely on the connecting rod 2, and the connecting rod 2, connecting joint 1, magnetic pole key 7, and limiting member 3 are all relatively fixed, when the hammer 4 is moved so that it slides on the connecting rod 2 towards the limiting member 3, the hammer 4 will strike the limiting member 3. The impact force generated by the hammer 4 striking the limiting member 3 causes the connecting rod 2 to briefly experience a force away from the connecting joint 1. In other words, the magnetic pole key 7 will also experience a force away from the interaction between the magnetic pole and the yoke. By repeatedly sliding the hammer 4 to strike the limiting member 3, the magnetic pole key 7 can eventually be gradually disengaged from the mating surface between the magnetic pole and the yoke.

[0035] Compared to Embodiment 1, in this embodiment, a lifting ring 5 structure is also provided at the end of the connecting rod 2 away from the connecting joint 1. When the magnetic key 7 cannot be pulled out after repeatedly moving the hammer 4 to strike the limiting member 3, it indicates that the magnetic key 7 is embedded too tightly. At this time, the magnetic key 7 cannot be pulled out by striking it with the hammer 4. Therefore, a lifting ring 5 can be arranged at the end of the connecting rod 2 away from the connecting joint 1.

[0036] Specifically, a lifting ring 5 is arranged on the side of the limiting member 3 away from the connecting joint 1 and on the connecting rod 2. The lifting ring 5 and the connecting rod 2 are also fixed by a threaded connection, such as... Figure 2 As shown, the connection end between the lifting ring 5 and the connecting rod 2 is in the form of an external threaded rod, while the connection end between the connecting rod 2 and the lifting ring 5 is in the form of an internal threaded hole.

[0037] Once the lifting ring 5 is in place, the crane hooks the lifting ring 5 and applies a pulling force to it. This causes the connecting rod 2 to gain an upward force, which ultimately pulls out the magnetic key 7 that is fixed to the connecting joint 1, thus completing the key removal operation.

[0038] Example 3: As Figure 3 The illustrated generator pole key removal tool includes a connecting connector 1, a connecting rod 2, a hammer 4, and a limiting member 3. It should be noted that the pole key 7 is a mechanical connector embedded between the magnetic pole and the yoke. In this embodiment, the pole key 7 is described as being positioned between the magnetic pole and the yoke within a hydroelectric generator.

[0039] Specifically, the connecting joint 1 is a cylindrical component. One end of the connecting joint 1 is a threaded end 1.1, and the other end is a welded end 1.2. The threaded end 1.1 of the connecting joint 1 can be threaded to the connecting rod 2, so that the connecting rod 2 and the connecting joint 1 are connected as a whole. The welded end 1.2 of the connecting joint 1 is a flat surface, which can be welded to the end face of the magnetic pole key 7 located outside the magnetic pole and the magnetic yoke, so that the connecting joint 1 and the magnetic pole key 7 are fixed together. In this way, the connecting rod 2 and the magnetic pole key 7 are connected together through the connecting joint 1.

[0040] Furthermore, a hand hammer 4 is also provided on the outside of the connecting rod 2. Both the hand hammer 4 and the connecting rod 2 are cylindrical structures, and the inside of the hand hammer 4 is a hollow cylinder. The hand hammer 4 is sleeved on the outside of the connecting rod 2 and forms a sliding connection. That is to say, the hollow inner wall of the hand hammer 4 and the outside of the connecting rod 2 are in clearance fit, and the hand hammer 4 can slide freely on the outside of the connecting rod 2.

[0041] Furthermore, a limiting member 3 is provided at the end of the connecting rod 2 away from the connecting joint 1, and the limiting member 3 is relatively fixed to the connecting rod 2. Thus, the connecting joint 1 and the limiting member 3 are located at opposite ends of the connecting rod 2, while the hammer 4 is positioned between the connecting joint 1 and the limiting member 3. Since the hammer 4 can slide freely on the connecting rod 2, and the connecting rod 2, connecting joint 1, magnetic pole key 7, and limiting member 3 are all relatively fixed, when the hammer 4 is moved so that it slides on the connecting rod 2 towards the limiting member 3, the hammer 4 will strike the limiting member 3. The impact force generated by the hammer 4 striking the limiting member 3 causes the connecting rod 2 to briefly experience a force away from the connecting joint 1. In other words, the magnetic pole key 7 will also experience a force away from the interaction between the magnetic pole and the yoke. By repeatedly sliding the hammer 4 to strike the limiting member 3, the magnetic pole key 7 can eventually be gradually disengaged from the mating surface between the magnetic pole and the yoke.

[0042] Unlike Embodiments 1 and 2, an elastic element 6 is provided on the side of the hammer 4 near the connecting joint 1. The axial end of the elastic element 6 is fixedly connected to the end face of the hammer 4. When the hammer 4 moves, the elastic element 6 also moves synchronously. The end of the elastic element 6 away from the hammer 4 is the free end. In this embodiment, the elastic element 6 adopts a circular spring structure. The circular spring is not only fixedly connected to the end of the hammer 4, but also sleeved on the outside of the connecting rod 2. The inner diameter of the circular spring is larger than the outer diameter of the connecting joint 1. If the radial dimension of the magnetic pole key 7 is larger than the radial dimension of the connecting joint 1, then the inner diameter of the circular spring needs to be larger than the outer diameter of the magnetic pole key 7. That is, the inner diameter of the circular spring needs to be larger than the larger radial dimension of the connecting joint 1 and the magnetic pole key 7 to ensure that the circular spring can pass through the connecting joint 1 and the magnetic pole key 7, so that the free end of the circular spring can abut against the upper end face of the magnetic pole and the magnetic yoke.

[0043] Furthermore, under natural conditions, the axial length of the coil spring needs to be greater than the axial length of the connecting head 1 to ensure that the hammer 4 can compress the coil spring, allowing the coil spring to acquire elastic potential energy.

[0044] The specific usage process is as follows: The connecting rod 2, connecting head 1, magnetic pole key 7, and elastic element 6 are all arranged vertically. When in use, the hammer 4 is located at the bottom of the connecting rod 2. At this time, the bottom of the elastic element 6 is in contact with the upper end face of the magnetic pole and the magnetic yoke. The operator presses the hammer 4 down further so that the bottom of the hammer 4 is in contact with the upper end face of the connecting head 1. At this time, the elastic element 6 can obtain the maximum elastic potential energy. Then the operator releases the hammer 4. Under the action of the elastic force of the elastic element 6, the hammer 4 moves in the direction of the limiting element 3 and finally strikes the limiting element 3, so that the connecting rod 2 can obtain an upward force and finally pull out the magnetic pole key 7.

[0045] It should be noted that in this embodiment, the length of the connecting rod 2 can be further reduced to 25cm to 40cm, and the key-pulling tool as a whole can be designed to be smaller, making it easier for operators to use.

[0046] It should also be noted that in this embodiment, when the hammer 4 moves upward, it is only subjected to the axial elastic force from the elastic element 6, thus completely eliminating the radial force generated when the hammer 4 moves upward, which also completely avoids damage to the connection between the magnetic pole key 7 and the connecting head 1.

[0047] Furthermore, it should be noted that since the upward movement of the hammer 4 is entirely driven by the force generated when the elastic element 6 is released, the elastic element 6 gradually extends as the hammer 4 moves upward. When the elastic force generated by the elastic element 6 is greater than the weight of the hammer 4 itself, the net force on the hammer 4 is vertically upward, and the hammer 4 will continue to accelerate. When the elastic force generated by the elastic element 6 is less than the weight of the hammer 4 itself, the net force on the hammer 4 is vertically downward, and the hammer 4 begins to decelerate. Without considering the sliding friction between the hammer 4 and the connecting rod 2, the speed of the hammer 4 reaches its maximum when the elastic force of the elastic element 4 equals the weight of the hammer 4 itself. Therefore, as... Figure 3 As shown, the distance from the upper end face of the magnetic pole and the yoke to the lower end face of the limiting member 3 can be designed to be equal to the sum of the length of the hammer 4 and the length of the elastic member 6 when it is naturally compressed by the hammer 4; wherein, when the elastic member 6 is naturally pressed down by the hammer 4, the elastic force generated by the elastic member 6 is the same as the magnitude of the weight of the hammer 4.

[0048] Furthermore, the connecting rod 2 can be designed as a threaded rod on the side away from the connecting joint 1, and the limiting member 3 can be a nut. When the hammer 4 is not subjected to external force and remains balanced with the elastic member 6, the limiting member 3 can be adjusted to the upper end face of the hammer 4. This allows the hammer 4 to strike the limiting member 3 at the maximum possible speed when moving upward, improving the key removal efficiency. The material of the elastic member 6 and the mass of the hammer 4 can be designed according to actual conditions, so that the elastic member 6 has a large elastic force and the hammer 4 has a large kinetic energy when striking the limiting member 3.

Claims

1. A generator pole key removal tool, characterized in that, include The connector includes a threaded end and a welded end, with the welded end being a solid flat surface. The connecting rod has one end threadedly connected to the screw end of the connecting joint, and the other end is equipped with a limit member; The hand hammer is slidably sleeved on the outside of the connecting rod and located between the connecting joint and the limiting member.

2. The generator pole key removal tool according to claim 1, characterized in that, The limiting component is a nut, and the limiting component is threadedly connected to the connecting rod.

3. The generator pole key removal tool according to claim 1, characterized in that, The length of the connecting rod is 0.5m to 1m.

4. The generator pole key removal tool according to claim 1, characterized in that, The hammer has an annular groove on its outer periphery.

5. A generator pole key removal tool according to any one of claims 1, 2, or 4, characterized in that, The connecting rod has a lifting ring at the end away from the connecting joint, and the lifting ring is threadedly connected to the connecting rod.

6. A generator pole key removal tool according to claim 5, characterized in that, The lifting ring is located on the side of the limiting member away from the connecting joint.

7. A generator pole key removal tool according to any one of claims 1, 2, or 4, characterized in that, An elastic element is fixed on the side of the hammer away from the limiting member, and the elastic element is arranged coaxially with the hammer.

8. A generator pole key removal tool according to claim 7, characterized in that, The elastic element is a circular spring, and the inner diameter of the elastic element is larger than the outer diameter of the connecting joint and the outer diameter of the magnetic pole key.

9. A generator pole key removal tool according to claim 7, characterized in that, The length of the connecting rod is 0.25m to 0.4m.

10. A generator pole key unloading tool according to claim 8, characterized in that, The axial length of the elastic element is greater than the axial length of the connecting joint.

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