Large generator shaft head removal tool

Abstract

The utility model relates to a large -scale generator axle head removal tool belongs to generator technical field. Removal tool includes: jack baffle, a plurality of screw rods, guide block and hydraulic jack. First, the guide block is fixed in the center of generator drive shaft, passes through and is fixed in the jack baffle with many screw rods, then the screw rod one end is fixed in the axle head that needs to remove, sets up the hydraulic jack between the jack baffle and guide block, lifts the hydraulic jack, and simultaneously heats axle head, makes axle head relative to engine drive shaft movement, until axle head separates from engine drive shaft, and then removes guide block, hydraulic jack together with jack baffle, screw rod and axle head from engine drive shaft. So can under not damaging axle head and engine drive shaft, realize axle head complete removal, solved the problem that axle head installation is difficult to remove, avoided the loss brought by this.

Description

Technical Field

[0001] This utility model relates to the field of generator technology, and particularly to the field of tools and methods for dismantling large generators, specifically referring to a tool for dismantling the shaft head of a large generator. Background Technology

[0002] In the installation of marine generator sets, generator installation is a crucial step, and the installation of the generator shaft end is one of the key tasks. Because the engine and generator operate under high torque and high vibration conditions, the coupling uses a highly elastic damper and an interference fit shaft end. The installation process typically involves first heating the shaft end to meet the clearance fit requirements, then using a lifting tool to quickly install it onto the generator's drive shaft, and allowing the shaft end to cool down to achieve the required interference fit.

[0003] However, in actual installation work, errors may occur due to incorrect material information leading to incorrect shaft head model installation, or due to unfamiliarity with installation techniques resulting in incomplete installation. When this happens, the shaft head needs to be removed. Because most shaft heads are interference fits, ordinary pullers cannot pull them out for disassembly at room temperature, making it impossible to continue the work. Using acetylene to cut the shaft head is too risky, potentially damaging the generator drive shaft connected to the shaft head and causing significant economic losses.

[0004] Therefore, how to provide a convenient tool for removing shaft heads and a corresponding removal method has become an urgent problem to be solved in this field. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a large generator shaft removal tool that facilitates complete removal of the shaft head without damaging the shaft head and engine drive shaft.

[0006] To achieve the above objectives, the large generator shaft head removal tool of this utility model has the following structure:

[0007] The large generator shaft removal tool includes a jack baffle, several screws, and a guide block. Each screw passes through and is fixedly connected to the jack baffle. One end of each screw is fixed to the shaft to be removed. The jack baffle has a jack mounting seat on the side facing the shaft. A hydraulic jack is mounted on the jack mounting seat. The guide block is fixed to the center of the generator drive shaft to which the shaft is fixed. The lifting end of the hydraulic jack presses against the guide block.

[0008] The large generator shaft removal tool also includes a hydraulic pump, which is connected to the hydraulic jack via an oil pipe, and a hydraulic gauge is installed on the oil pipe.

[0009] The large generator shaft head removal tool also includes a shaft head heating device for heating the shaft head.

[0010] The large generator shaft removal tool also includes several spacer blocks, which can be positioned between the guide block and the lifting end of the hydraulic jack.

[0011] This utility model discloses a large generator shaft removal tool, comprising: a jack baffle, several screws, a guide block, and a hydraulic jack. First, the guide block is fixed to the center of the generator drive shaft. Multiple screws are passed through and fixed to the jack baffle, and the hydraulic jack is installed on the jack mounting base of the jack baffle. Then, one end of each screw is fixed to the shaft to be removed, and the hydraulic jack is positioned between the jack mounting base and the guide block. The hydraulic jack is then lifted, simultaneously heating the shaft, causing it to move relative to the engine drive shaft. Once the shaft is detached from the engine drive shaft, the guide block, hydraulic jack, jack baffle, screws, and shaft are removed from the engine drive shaft. This allows for complete removal of the shaft without damaging the shaft and engine drive shaft, solving the problem of difficult shaft removal and avoiding associated losses. Attached Figure Description

[0012] Figure 1 A schematic diagram of a structure for mounting the shaft head onto the generator drive shaft of a large generator;

[0013] Figure 2 This is a schematic diagram of the structure of the large generator shaft head removal tool of this utility model;

[0014] Figure 3 This is a schematic diagram showing the large generator shaft head removal tool of this utility model assembled on the shaft head to be removed;

[0015] Figure 4 A schematic diagram of the guide block and spacer block installed at the center of the generator drive shaft in the large generator shaft removal tool of this utility model;

[0016] Figure 5 This is a flowchart illustrating the steps of using the large generator shaft head removal tool of this utility model.

[0017] Figure label:

[0018] 1. Jack baffle; 2. Screw; 3. Hydraulic jack; 4. Guide block; 5. Spacer block; 6. Shaft head; 7. Generator drive shaft; 8. Detailed Implementation

[0019] In order to better understand the technical content of this utility model, the following embodiments are provided for detailed description.

[0020] like Figure 1 The diagram shows a structural schematic of mounting the shaft head 9 onto the generator drive shaft 10 of a large generator. If the shaft head 9 is installed incorrectly or not properly, it needs to be removed from the generator drive shaft 10.

[0021] Please see Figure 2 As shown, this is a tool for removing the shaft head of a large generator according to the present invention. It includes a jack baffle 1, several screws 2, and a guide block 4. Each screw 2 passes through and is fixedly connected to the jack baffle 1, as shown below. Figure 3 As shown, one end of each screw 2 is fixed to the shaft head 9 to be removed. The side of the jack baffle 1 facing the shaft head 9 has a jack fixing seat (not shown in the figure), and the hydraulic jack 3 is mounted on the jack fixing seat. Figure 4 As shown, the guide block 4 is fixed to the center of the generator drive shaft 10 to which the shaft head 9 is fixed, and the lifting end of the hydraulic jack 3 presses against the guide block 4.

[0022] In a preferred embodiment, the large generator shaft removal tool further includes a hydraulic pump (not shown in the figure), which is connected to the hydraulic jack 3 via an oil pipe, and a hydraulic gauge (not shown in the figure) is installed on the oil pipe.

[0023] In a further preferred embodiment, the large generator shaft head removal tool also includes a shaft head heating device (not shown in the figure), which can be acetylene welding to heat the shaft head 9.

[0024] In a more preferred embodiment, such as Figure 4 As shown, the large generator shaft head removal tool also includes several spacer blocks 5, which can be set between the guide block 4 and the lifting end of the hydraulic jack 3.

[0025] This utility model provides a method for using a tool for removing the shaft head of a large generator, such as... Figure 5 As shown, the method includes the following steps:

[0026] (1) Fix the guide block to the center of the generator drive shaft; pass multiple screws through and fix them to the jack baffle, and install the hydraulic jack on the jack fixing seat of the jack baffle;

[0027] (2) Fix one end of each screw to the shaft head to be removed, and place the hydraulic jack between the jack fixing seat and the guide block;

[0028] (3) Lift the hydraulic jack and heat the shaft head at the same time, so that the shaft head moves relative to the engine drive shaft;

[0029] (4) When the shaft head is disengaged from the engine drive shaft, the guide block, hydraulic jack, jack baffle, screw and shaft head are removed from the engine drive shaft.

[0030] In a preferred embodiment, step (3) specifically includes:

[0031] (31) Pressurize using the hydraulic pump connected to the hydraulic jack and observe the hydraulic gauge connected to the hydraulic pump, pressurize to the preset pressure value;

[0032] (32) Heating the shaft head using a heating device;

[0033] (33) When the shaft head moves relative to the engine drive shaft and the pressure gauge shows a decrease in pressure, continue to pressurize.

[0034] In a more preferred embodiment, step (3) further includes:

[0035] (34) When the hydraulic jack reaches its maximum stroke, if the shaft head has disengaged from the engine drive shaft, proceed to step (4); if the shaft head has not disengaged from the engine drive shaft, proceed to step (35).

[0036] (35) Remove the hydraulic jack and reset it;

[0037] (36) Set a number of spacers on the guide block, and place the hydraulic jack between the jack fixing seat and the spacers, and return to step (31).

[0038] In practical applications, this utility model's large generator shaft head removal tool includes four fixing studs, a special baffle, a guide block, a hydraulic jack, and four spacer blocks. During actual use, in conjunction with a short-time acetylene welding heating process, the shaft head is quickly pulled out using hydraulic tools within the transition window, achieving shaft head disassembly. This allows for complete removal of the shaft head without damaging the generator drive shaft, mitigating significant economic losses that could result from incorrect installation.

[0039] The method for removing the shaft head of a large generator using the dismantling tool of this utility model consists of the following steps:

[0040] 1. First, pass the four screws through the baffle, confirm the appropriate dimensions at both ends, and tighten the screws on both sides with nuts. Install the guide block to the center of the generator drive shaft and place the hydraulic jack.

[0041] 2. Use a crane to lift the baffle. Install the baffle onto the shaft head, adjusting the baffle's center to align with the shaft head's center. Use washers and nuts to tighten the screw rod to the shaft head. Connect the hydraulic pump and hydraulic gauge hoses to the hydraulic jack.

[0042] 3. First, pre-pressurize the jack to 300 bar using the hydraulic pump. A damp cloth can be used to cover the generator drive shaft and hydraulic lines to prevent damage from high temperatures. Then, the operator begins heating the keyed connection at the shaft end using acetylene torch, using a temperature gun to monitor the temperature at the heated area and to observe pressure changes on the hydraulic gauge.

[0043] 4. When the surface temperature of the shaft head reaches approximately 200℃, the hydraulic pressure gauge begins to drop. The shaft head begins to loosen and creep outwards. At this time, the hydraulic pump continues to pressurize, accelerating the creeping speed of the shaft head. When the hydraulic jack reaches its maximum stroke, remove the nut on the outside of the baffle, move the baffle out, remove the jack and reset it. Add a spacer block to the guide block, then insert the jack again, push the baffle in to hold the jack in place, and use a lock nut to lock the baffle. Repeat steps 3 and 4 until the shaft head disengages from the generator drive shaft.

[0044] This utility model discloses a large generator shaft removal tool, comprising: a jack baffle, several screws, a guide block, and a hydraulic jack. First, the guide block is fixed to the center of the generator drive shaft. Multiple screws are passed through and fixed to the jack baffle, and the hydraulic jack is installed on the jack mounting base of the jack baffle. Then, one end of each screw is fixed to the shaft to be removed, and the hydraulic jack is positioned between the jack mounting base and the guide block. The hydraulic jack is then lifted, simultaneously heating the shaft, causing it to move relative to the engine drive shaft. Once the shaft is detached from the engine drive shaft, the guide block, hydraulic jack, jack baffle, screws, and shaft are removed from the engine drive shaft. This allows for complete removal of the shaft without damaging the shaft and engine drive shaft, solving the problem of difficult shaft removal and avoiding associated losses.

[0045] In this specification, the present invention has been described with reference to specific embodiments thereof. However, it will be apparent that various modifications and variations can be made without departing from the spirit and scope of the present invention. Therefore, the specification and drawings should be considered illustrative rather than restrictive.

Claims

1. A tool for removing the shaft head of a large generator, characterized in that, The device includes a jack baffle, several screws, and a guide block. Each screw passes through and is fixedly connected to the jack baffle. One end of each screw is fixed to the shaft head to be removed. The jack baffle has a jack mounting seat on the side facing the shaft head. A hydraulic jack is mounted on the jack mounting seat. The guide block is fixed to the center of the generator drive shaft to which the shaft head is fixed. The lifting end of the hydraulic jack presses against the guide block.

2. The large generator shaft head removal tool according to claim 1, characterized in that, It also includes a hydraulic pump, which is connected to the hydraulic jack via an oil pipe, and a hydraulic gauge is installed on the oil pipe.

3. The large generator shaft head removal tool according to claim 2, characterized in that, It also includes a shaft head heating device for heating the shaft head.

4. The large generator shaft head removal tool according to claim 3, characterized in that, It also includes several spacers, which can be positioned between the guide block and the lifting end of the hydraulic jack.

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