Installation method of self-locking spiral wire for gas turbine

Abstract

The invention discloses a mounting method of a self-locking spiral wire for a gas turbine. The mounting method comprises the following steps: S1, checking a screw hole by using a plug gauge; s2, the cleanliness of the screw hole is ensured; s3, the front end part of the spiral wire is screwed into a torque tool, and the spiral wire is screwed into the screw hole through the torque tool; s4, an auxiliary tool is used for pressing the spiral thread to be screwed into the hole in the radial direction, meanwhile, the spiral thread outside the hole is pressed tightly in the hole depth direction, and the rest spiral thread is assisted to be fed into the screw hole; and S5, the tool is withdrawn, and whether the spiral wire is installed successfully or not is checked. Through standardization inspection, torque tool pre-guiding and auxiliary pressurization, the meshing track is corrected, and the wire jumping problem of the self-locking spiral wire caused by the resistance of the locking ring is systematically solved. Through the modular design and the step-by-step operation process, the device has wide universality, can adapt to requirements of different materials, sizes and working conditions, and is particularly suitable for the gas turbine and other fields with strict requirements for threaded connection reliability.

Description

Technical Field

[0001] The invention relates to the technical field of gas turbine manufacturing, in particular to a method for installing a self-locking spiral wire for a gas turbine. Background Art

[0002] Bolt connection is one of the most widely used connection methods for mechanical products. In order to protect the service life of the threaded hole and facilitate disassembly and replacement, a spiral thread is usually installed in the threaded hole. Gas turbines usually work under high temperature, high pressure, and frequent gas shock conditions. Conventional spiral threads are very easy to loosen and fall off, resulting in connection failure. Self-locking spiral threads have all the advantages of conventional spiral threads. At the same time, the self-locking spiral thread is designed with one or more regular polygonal locking rings. When the bolt is screwed in after installation, the polygonal locking ring generates a radial locking force on the bolt, thereby locking the bolt to adapt to high vibration conditions.

[0003] Due to the presence of a locking ring, the self-locking spiral thread sleeve is prone to thread jumping when the spiral thread is screwed into the screw hole during installation, causing the spiral thread in the hole to be deformed and scrapped. To address this issue, technicians often use a threaded tool to first match the spiral thread with the tool, and then use the tool to install the spiral thread into the screw hole. The self-locking spiral thread used in gas turbines is relatively large in size and weak in rigidity. Even if the above installation method is adopted, there are still many thread jumping problems, resulting in great waste. In addition, there are many spiral thread specifications. If the tool thread is completely matched, the processing cost of the tool is high. Summary of the invention

[0004] The purpose of the present invention is to provide a method for installing a self-locking spiral wire for a gas engine in order to solve the above-mentioned problems, so as to improve the success rate of installing the self-locking spiral wire for a gas engine and reduce the scrapping.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A method for installing a self-locking spiral wire for a combustion engine comprises the following steps:

[0007] S1. Check the screw hole with a plug gauge;

[0008] S2. Ensure the cleanliness of the screw holes;

[0009] S3, screw the front end of the spiral wire into the torque tool, and screw the spiral wire into the screw hole through the torque tool;

[0010] S4. Use an auxiliary tool to press the spiral thread to be screwed into the hole in the radial direction, and at the same time press the spiral thread outside the hole in the direction of the hole depth to assist the remaining spiral thread to be sent into the screw hole;

[0011] S5. Exit the torque tooling and check whether the spiral wire is installed successfully.

[0012] Optionally, in S1, use a plug gauge of corresponding specifications to check the screw hole. The through end will enter and the stop end will not enter. Note that the through end needs to be screwed to the bottom of the screw hole for inspection.

[0013] Alternatively, in S2, clean with a clean cloth dipped in kerosene.

[0014] Alternatively, in S2, if the thread surface quality is poor, grind it with a corresponding grinding tool; or use a tap of the same specification for processing.

[0015] Optionally, in S3, the torque tooling is a T-type torque wrench, which is composed of a screw rod and a torque rod by welding, and the end of the torque rod is provided with an external thread that matches the internal thread of the spiral wire.

[0016] Optionally, in S3, screw the front two loops of the spiral into the torque rod.

[0017] Optionally, in S4, the auxiliary tool is a needle-nosed pliers or a chisel.

[0018] Optionally, in S4, there are two auxiliary tools, one on each side, to press the spiral thread to be screwed into the hole.

[0019] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0020] The present invention provides a method for installing a self-locking spiral thread for a gas turbine, which systematically solves the problem of self-locking spiral thread jumping caused by the resistance of the locking ring through standardized inspection, torque tooling pre-guidance and auxiliary pressurization to correct the meshing trajectory. Its modular design and step-by-step operation process make it widely applicable and can be adapted to different materials, sizes and working conditions. It is particularly suitable for fields such as gas turbines that have strict requirements on the reliability of threaded connections. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will now be described by way of example with reference to the accompanying drawings, in which:

[0022] Figure 1 is a schematic diagram of the process of this method.

[0023] Figure 2 It is a structural schematic diagram of the torque tooling.

[0024] Markings in the figure: 1-twisting rod, 2-torque rod, 3-external thread. DETAILED DESCRIPTION

[0025] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0026] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0027] Any feature disclosed in this specification, unless otherwise stated, can be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0028] A method for installing a self-locking spiral wire for a combustion engine, such as Figure 1-2 As shown, the following steps are included:

[0029] S1. Check the screw hole with a plug gauge;

[0030] S2. Ensure the cleanliness of the screw holes;

[0031] S3. Screw the front end of the spiral wire into the torque tooling. Figure 2 As shown, the spiral wire is screwed into the screw hole through the torque tool;

[0032] S4. Use an auxiliary tool to press the spiral thread to be screwed into the hole in the radial direction, and at the same time press the spiral thread outside the hole in the direction of the hole depth to assist the remaining spiral thread to be sent into the screw hole;

[0033] S5. Exit the torque tooling and check whether the spiral wire is installed successfully.

[0034] Among them, plug gauges are used to check to ensure that the size, pitch and verticality of the screw hole meet the requirements, so as to avoid uneven force or misalignment of the spiral wire when entering the hole due to thread hole processing errors. Cleaning the screw hole can remove debris, oil or oxide layer, reduce additional friction resistance during installation, and prevent wire jump caused by foreign matter jamming. Use a torque tool to screw the front end of the spiral wire into the screw hole, ensure that the initial section of the spiral wire is aligned with the threaded hole, and apply uniform rotational force through torque control to avoid wire jump caused by manual installation deflection or uneven force. The rigid guidance of the torque tool can offset the initial resistance of the locking ring and prevent the spiral wire from jumping due to sudden resistance changes at the moment of entering the hole. The auxiliary tool presses the spiral wire thread to be screwed into the hole in the radial direction, assists the spiral wire thread to be screwed into the threaded hole, forces the thread thread to fit the threaded hole, and reduces local stress concentration caused by deformation of the locking ring or thread gap. Correct the meshing trajectory of the spiral wire and the screw hole to prevent the thread thread from skipping the thread crest. Apply pressure to the spiral wire outside the hole along the hole depth direction to ensure that the spiral wire always maintains close contact with the screw hole during rotation, prevent the spiral wire from being disengaged due to local warping or rebound, and prevent the spiral wire inside the hole from being deformed and scrapped when the spiral wire outside the hole cannot be screwed into the hole. The combination of the two is equivalent to phased guidance, dispersing the resistance of the locking ring to multiple thread buckles to avoid single-point resistance causing wire jump. Check whether the spiral wire is fully embedded and the locking ring is in place by visual or tool inspection to ensure that the problem of wire jump is completely eliminated.

[0035] The torque tool does not need to match the thread of the spiral wire exactly, it only needs to be able to grasp the first few turns of the spiral wire and rotate it. Therefore, the same tool can be used for spiral wires of various specifications. Auxiliary tools are usually designed to be adjustable to accommodate spiral wires of different diameters, which allows the same tool to be used for the installation of multiple spiral wires. The installation of spiral wires through standardized steps does not rely on specific personnel skills and is easy to promote and use in different occasions and among different personnel.

[0036] As another specific implementation, in S1, a plug gauge of corresponding specifications is used to check the screw hole. The through end enters but the stop end does not. Note that the through end needs to be screwed to the bottom of the screw hole for inspection. The thread specifications of the plug gauge must match the thread specifications of the screw hole. The size of the through end is slightly smaller than the standard size of the screw hole. If the through end can smoothly enter the screw hole and reach the bottom, it means that the size of the screw hole is within the allowable tolerance range. The size of the stop end is slightly larger than the standard size of the screw hole. If the stop end cannot enter the screw hole, it means that the screw hole does not exceed the maximum size tolerance. The plug gauge reaches the bottom of the screw hole to ensure that the thread size from the screw hole mouth to the bottom of the hole is qualified so that the spiral wire can be fully installed. There are no broken wires, blockages or other defects in the screw hole.

[0037] As another specific implementation, in S2, kerosene is used for cleaning. Kerosene can dissolve and remove pollutants such as oil, dust, and metal chips in the screw hole, and can act as a lubricant to a certain extent, reducing the friction between the spiral wire and the screw hole during installation, which helps the spiral wire to be screwed in smoothly. It can also form a protective film on the metal surface to prevent the metal inside the screw hole from oxidizing and rusting in a short time.

[0038] As another specific implementation, in S2, if the surface quality of the thread is not good, grind it with a corresponding grinding tool; or use a tap of the same specification for processing. If it is found that the surface quality of the thread is not good, there may be problems such as damage, rust or inaccurate size. It is necessary to take corresponding measures to repair the thread to ensure that the spiral wire can be installed smoothly and play its due role, providing a good foundation for the subsequent installation of the spiral wire, thereby improving the reliability and service life of the connection. When grinding with the corresponding grinding tool, select a suitable thread grinding rod or thread grinding brush according to the specification and degree of damage of the thread. Gently screw the grinding tool into the screw hole, slowly rotate the grinding tool, and gently apply pressure at the same time, so that the grinding material removes the oxide layer, rust or minor defects on the surface of the thread. Repeat the operation until the surface of the thread is restored to smoothness and flatness. When processing with a tap of the same specification, align the tap with the screw hole and gently screw it in, paying attention to maintaining the verticality of the tap. Slowly rotate the tap while applying pressure evenly so that the tap can cut and remove abnormal high points on the surface of the thread. Gradually go deeper until the thread is completely processed. After processing, use a cleaning cloth or compressed air to remove the grinding residue in the screw hole, and use a plug gauge to check the quality of the thread again to ensure that it meets the installation requirements.

[0039] As another specific embodiment, in S3, the torque tool is a T-type torque wrench, which is composed of a screw rod 1 and a torque rod 2 by welding, and the end of the torque rod is provided with an external thread 3 that cooperates with the internal thread of the spiral wire. Using a T-type torque wrench to install the spiral wire can ensure that the spiral wire can be screwed into the screw hole with the correct torque, thereby ensuring the reliability of the connection and the locking effect of the spiral wire. The screw rod 1 is used to manually rotate the wrench to screw in or withdraw the spiral wire. The torque rod 2 is connected to the screw rod 1 by welding, and is used to transmit the torque of the screw rod 1. The external thread 3 is located at the end of the torque rod 2, and is used to cooperate with the internal thread of the spiral wire to ensure that the wrench can firmly grasp the spiral wire.

[0040] As another specific implementation, in S3, the first two buckles of the spiral wire are screwed into the torque rod. The external thread 3 only needs to ensure that the first few buckles of the spiral wire can be screwed in, so that the remaining spiral wire has freedom, provides adjustment space, and reduces the phenomenon of wire jumping due to poor alignment. And the torque tool can be used to install spiral wires of different specifications, as long as the tool can match the first few buckles of the spiral wire, thereby improving the versatility of the torque tool. Among them, screwing in two buckles is sufficient to allow the spiral wire to be initially aligned with the screw hole, so that the position of the spiral wire can be adjusted without being completely screwed in, simplifying the alignment process. As other methods, other numbers can also be adopted, but it can still only be the first few buckles.

[0041] As another specific implementation, in S4, the auxiliary tool is a pair of needle-nosed pliers or a chisel, which can help the spiral wire overcome the initial friction, maintain the alignment and stability of the spiral wire during the screwing process, and smoothly enter the screw hole. The tip of the needle-nosed pliers can accurately clamp the spiral wire, and the chisel can provide the necessary striking force.

[0042] As another specific implementation, in S4, one auxiliary tool is provided on each side to press the spiral thread to be screwed into the hole. The two tools act simultaneously from relative positions, which helps to keep the spiral thread aligned with the screw hole, more precisely control the screwing speed and force of the spiral thread, and reduce the risk of thread skipping or misalignment.

[0043] This method is used to install the self-locking spiral thread of the H100 gas turbine. According to the data of the G112AN2 unit, the success rate of the self-locking spiral thread installation is increased from about 30% to 100%.

[0044] The method realizes a high success rate installation of the self-locking spiral wire for the gas turbine, and at the same time, the tooling is simple to manufacture and the installation cost is low. The method is also applicable to traditional spiral wires and other small-sized spiral wires.

[0045] The present invention is not limited to the above-mentioned specific embodiments, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. A method for installing a self-locking spiral wire for a gas turbine, characterized in that: The following steps are involved: S1. Check the screw hole with a plug gauge; S2. Ensure the cleanliness of the screw holes; S3, screw the front end of the spiral wire into the torque tool, and screw the spiral wire into the screw hole through the torque tool; S4. Use an auxiliary tool to press the spiral thread to be screwed into the hole in the radial direction, and at the same time press the spiral thread outside the hole in the direction of the hole depth to assist the remaining spiral thread to be sent into the screw hole; S5. Exit the tooling and check whether the spiral wire is installed successfully.

2. The method for installing a self-locking spiral wire for a gas engine according to claim 1, characterized in that: In S1, use a plug gauge of corresponding specifications to check the screw hole. The through end goes in and the stop end does not go in. Note that the through end needs to be screwed to the bottom of the screw hole for inspection.

3. The method for installing a self-locking spiral wire for a gas engine according to claim 1, characterized in that: In S2, clean with a clean cloth dipped in kerosene.

4. The method for installing a self-locking spiral wire for a gas engine according to claim 1, characterized in that: In S2, if the thread surface quality is not good, grind it with the corresponding grinding tool; Or use taps of the same specifications.

5. The method for installing a self-locking spiral wire for a gas engine according to claim 1, characterized in that: In S3, the torque tool is a T-type torque wrench, which is composed of a twist rod and a torque rod through welding, and the end of the torque rod is provided with an external thread that matches the internal thread of the spiral wire.

6. The method for installing a self-locking spiral wire for a combustion engine according to claim 5, characterized in that: In S3, screw the two front loops of the spiral into the torque rod.

7. The method for installing a self-locking spiral wire for a gas engine according to claim 1, characterized in that: In S4, the auxiliary tool is a needle-nosed pliers or a chisel.

8. The method for installing a self-locking spiral wire for a combustion engine according to claim 1, characterized in that: In S4, there are two auxiliary tools, one on each side, which press the spiral thread to be screwed into the hole.

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