Anti-deformation tool for installation and adjustment of sealing ring of low-pressure inner cylinder of steam turbine

Abstract

The invention discloses an anti-deformation tool for installing and adjusting a sealing ring of a low-pressure inner cylinder of a steam turbine, and relates to the technical field of anti-deformation tools, the anti-deformation tool is installed on an inner cylinder piece and comprises an integrated shell, a connecting screw rod and a detection unit, the integrated shell is arranged on the inner cylinder piece, the connecting screw rod is installed at the end of the integrated shell in a threaded mode, and a threaded groove is formed in the inner cylinder piece; and one end of the outer wall of the connecting screw rod is in threaded connection with an inner cavity of the threaded groove, and the detection unit is arranged in the integrated shell and used for detecting the state of the inner cylinder part. According to the invention, the inner cylinder piece, the integrated shell and the connecting screw rods are used in a matched manner, and the connecting screw rods at the two ends of the integrated shell are in threaded connection with the inner cylinder piece, so that the weak part of the inner cylinder piece can be supported by the integrated shell and the two connecting screw rods, and the shape stability of the inner cylinder piece is ensured when a steel piece of the inner cylinder piece is machined; machining deformation caused by machining stress release can be effectively prevented, and the product quality is improved.

Description

Technical Field

[0001] This invention relates to the field of anti-deformation tooling technology, and in particular to an anti-deformation tooling for installing and adjusting the sealing ring of the low-pressure inner cylinder of a steam turbine. Background Technology

[0002] As an important stator component of the low-pressure module of the steam turbine, the low-pressure inner cylinder must not only support and position the low-pressure blades at all levels to ensure continuous energy conversion, but also work safely, stably and efficiently throughout its entire life cycle. However, due to the high temperature and pressure of the gas entering the exhaust cylinder, as well as the large impact stress formed by the gas flowing through the body, the low-pressure inner cylinder is subject to various challenges.

[0003] The design of the pressure-bearing structure and gas-tightness of the low-pressure inner cylinder sealing ring has very high requirements, especially in terms of controlling its welding deformation and controlling the dimensions of thin-walled parts with poor rigidity. The manufacturing difficulty is quite high. Moreover, as an internal core component, it is a major challenge to ensure accurate installation while ensuring welding deformation and dimensional accuracy control. Furthermore, since the sealing ring has only one external hoisting support, it needs to go through welding and processing steps during the manufacturing process. Under the condition of weak rigidity with few supports, its deformation is unavoidable.

[0004] Therefore, a deformation-resistant tooling for installing and adjusting the sealing ring of the low-pressure inner cylinder of a steam turbine was designed to solve or alleviate the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a deformation-resistant tooling for installing and adjusting the sealing ring of the low-pressure inner cylinder of a steam turbine, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a deformation-resistant tooling for installing and adjusting the sealing ring of the low-pressure inner cylinder of a steam turbine, which is installed on the inner cylinder component and includes: An integrated housing is disposed on the inner cylinder component; A connecting screw is threadedly installed at the end of the integrated housing. The inner cylinder has a threaded groove, and one end of the outer wall of the connecting screw is threadedly connected to the inner cavity of the threaded groove. A detection unit is disposed inside the integrated housing and is used to detect the condition of the inner cylinder components.

[0007] Preferred options also include: The first locking nut is threaded onto the outside of the connecting screw, and the first locking nut is pressed against the end of the integrated housing; The second locking nut is threaded onto the outside of the connecting screw and is pressed against the inner wall of the inner cylinder. The end of the outer wall of the connecting screw has a planar notch.

[0008] Preferably, the integrated housing includes: A first housing and a second housing, wherein the first housing and the second housing are symmetrically arranged; The threaded holes are respectively opened at one end of the first housing and the second housing opposite to each other, and the other end of the outer wall of the connecting screw is threadedly connected to the threaded holes.

[0009] Preferably, the integrated housing includes: A fixing plate is disposed on the side of the first housing and the second housing; A fixing bolt is provided on one side of the fixing plate, and the outer wall of the fixing bolt is threadedly connected to the first housing and the second housing respectively; A limiting plate is fixedly connected on one side to the inner wall of the first housing and the second housing, respectively, and the limiting plate is used to limit the detection unit.

[0010] Preferably, the detection unit includes: The detection probe has a connecting hole at the end of the connecting screw, the outer wall of the detection probe is slidably sleeved with the inner cavity of the connecting hole, and the end of the detection probe is in contact with the inner wall of the threaded groove. A connecting plate is slidably disposed inside the integrated housing, and the other end of the detection probe is fixedly connected to the connecting plate.

[0011] Preferably, the detection unit further includes: A detection terminal, wherein the detection terminal is disposed inside the integrated housing; A pressure sensor is installed on the detection terminal and is used to detect the compressive force on the detection probe.

[0012] Preferably, the detection unit further includes: A first mounting plate is slidably mounted inside the integrated housing, and the detection terminal is fixedly mounted on the top of the first mounting plate; The second mounting plate is slidably mounted inside the integrated housing and is located on the side of the pressure sensor away from the detection terminal. A limiting spring is disposed inside the integrated housing. One end of the limiting spring is pressed against the connecting plate. The limiting spring is located on the opposite side of the first mounting plate and the second mounting plate.

[0013] Preferably, the detection unit further includes: A guide rod is disposed inside the integrated housing. Through holes are provided on the connecting plate, the first mounting plate, and the second mounting plate. The outer wall of the guide rod is slidably sleeved with the through holes. A limiting collar is fixedly connected to the inside of the integrated housing, and the end of the guide rod is slidably sleeved with the limiting collar.

[0014] Preferably, the method of using the anti-deformation tooling includes the following steps: Step 1: Rotate the connecting screw towards the inside of the integrated housing so that the distance between the opposite ends of the connecting screws at both ends of the integrated housing is less than the width of the inner cylinder support mounting point. Then, thread the connecting screw at the end of the integrated housing to the threaded groove on the inner cylinder and use the first locking nut and the second locking nut to lock and limit the connecting screw. Step 2: The integrated housing and connecting screw support and limit the inner cylinder, and the detection unit monitors the state of the inner cylinder in real time during the processing of the inner cylinder. Step 3: After the inner cylinder part is machined, loosen the first locking nut and the second locking nut to separate the connecting screw from the inner cylinder part, and disassemble the integrated housing and the connecting screw.

[0015] Preferably, the detection unit in step two performs real-time detection of the inner cylinder component's condition, including the following steps: S2.1: After the integrated housing and connecting screw are installed on the inner cylinder, the end of the detection probe is pressed against the inner wall of the threaded groove on the inner cylinder. The limiting spring acts on the detection probe through the connecting plate with an elastic compressive force. The pressure sensor detects the elastic compressive force on the limiting spring through the first mounting plate and the second mounting plate. S2.2: By judging the change in the value detected by the pressure sensor, we can analyze whether the inner cylinder has deformed. That is, when the inner cylinder is in a static state, the value detected by the pressure sensor is set as the standard value, and then a standard error is set. By judging whether the change in the value detected by the pressure sensor is within the standard error, we can determine whether the inner cylinder has deformed and been damaged. That is, if the change in the value detected by the pressure sensor is within the standard error, the inner cylinder has not deformed and been damaged. Conversely, if the change in the value detected by the pressure sensor is not within the standard error, the inner cylinder has deformed and been damaged.

[0016] The technical effects and advantages of this invention are as follows: (1) The present invention utilizes the cooperative use of the inner cylinder, the integrated housing and the connecting screws. The connecting screws at both ends of the integrated housing are threadedly connected to the inner cylinder, so that the integrated housing and the two connecting screws can support the weak part of the inner cylinder, thereby ensuring the stability of the shape of the inner cylinder during the processing of the inner cylinder steel, effectively preventing processing deformation caused by the release of processing stress, and improving product quality. (2) The present invention utilizes the combined use of an integrated housing, a connecting screw, and a detection component. The detection component includes a detection probe, a connecting plate, a detection terminal, a pressure sensor, a first mounting plate, a second mounting plate, and a limiting spring. When the integrated housing and the connecting screw support and protect the inner cylinder, the end of the detection probe is in contact with the inner cylinder. The data detected by the pressure sensor can detect in real time whether the inner cylinder has deformed, thereby further improving the quality of the inner cylinder processing and production. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the anti-deformation tooling of the present invention; Figure 3 This is a schematic diagram of the internal structure of the integrated housing of the present invention from the front. Figure 4 This is a schematic diagram of the internal structure of the first housing of the present invention.

[0018] Figure 5 This is a schematic cross-sectional view of the first housing structure of the present invention.

[0019] In the attached diagram: 1. Inner cylinder; 2. Integrated housing; 21. First housing; 22. Second housing; 23. Fixing plate; 24. Fixing bolt; 25. Threaded hole; 26. Limiting plate; 3. Connecting screw; 4. Detection unit; 41. Detection probe; 42. Connecting plate; 43. Detection terminal; 44. Pressure sensor; 45. First mounting plate; 46. Second mounting plate; 47. Guide rod; 48. Limiting spring; 49. Limiting collar; 5. First locking nut; 6. Second locking nut. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] This invention provides, for example Figures 1-5 The above is a deformation-preventing tooling for installing and adjusting the sealing ring of the low-pressure inner cylinder of a steam turbine, which is installed on the inner cylinder component 1.

[0022] Example 1: Includes an integrated housing 2, connecting screws 3, and a detection unit 4. The integrated housing 2 is disposed on the inner cylinder 1. The connecting screws 3 are threadedly installed at the end of the integrated housing 2. The inner cylinder 1 has a threaded groove. One end of the outer wall of the connecting screws 3 is threadedly connected to the inner cavity of the threaded groove. This allows the integrated housing 2 and the two connecting screws 3 to support and limit the weak parts of the inner cylinder 1, thereby improving the stability of the inner cylinder 1 during processing. The detection unit 4 is disposed inside the integrated housing 2. The detection unit 4 is used to detect the state of the inner cylinder 1. During the processing of the inner cylinder 1, the detection unit 4 can detect whether the weak parts of the inner cylinder 1 have deformed, thus avoiding the situation where the inner cylinder 1 is deformed due to force under the action of the integrated housing 2 and the connecting screws 3 and cannot be detected in time.

[0023] Furthermore, it also includes a first locking nut 5 and a second locking nut 6. The first locking nut 5 is threaded onto the outside of the connecting screw 3 and is pressed against the end of the integrated housing 2. The second locking nut 6 is threaded onto the outside of the connecting screw 3 and is pressed against the inner wall of the inner cylinder 1. Under the action of the first locking nut 5 and the second locking nut 6, the stability of the connecting screw 3 installation can be ensured. The end of the outer wall of the connecting screw 3 is provided with a planar notch. Under the action of the planar notch, it is convenient to use a wrench to drive the connecting screw 3 to rotate.

[0024] Furthermore, the integrated housing 2 includes a first housing 21, a second housing 22, threaded holes 25, a fixing plate 23, fixing bolts 24, and a limiting plate 26. The first housing 21 and the second housing 22 are symmetrically arranged. The threaded holes 25 are respectively opened at opposite ends of the first housing 21 and the second housing 22. The other end of the outer wall of the connecting screw 3 is threadedly connected to the threaded hole 25, and the internal thread of the threaded hole 25 is in the same direction as the thread of the threaded groove. Thus, by rotating the connecting screw 3, the connecting screw 3 can be moved away from the integrated housing 2 and connected to the threaded groove, or the connecting screw 3 can be moved towards the integrated housing 2 and separated from the threaded groove. The two connecting screws connecting the first housing 21 and the second housing 22 are... 3 can be connected by one threaded connection and the other by a rotatable connection, so that the integrated housing 2 can cooperate with the two connecting screws 3 and the size of the weak part of the inner cylinder 1 can be adjusted. The fixing plate 23 is set on the side of the first housing 21 and the second housing 22. The fixing bolt 24 is set on one side of the fixing plate 23. The outer wall of the fixing bolt 24 is threadedly connected to the first housing 21 and the second housing 22 respectively. One side of the limiting plate 26 is fixedly connected to the inner wall of the first housing 21 and the second housing 22 respectively. The limiting plate 26 is used to limit the detection unit 4. By removing the fixing bolt 24, the first housing 21 and the second housing 22 can be separated to facilitate the disassembly and maintenance of the detection unit 4 inside the first housing 21 and the second housing 22.

[0025] Example 2: Based on Example 1, the detection unit 4 includes a detection probe 41, a connecting plate 42, a detection terminal 43, and a pressure sensor 44. A connecting hole is provided at the end of the connecting screw 3. The outer wall of the detection probe 41 is slidably sleeved with the inner cavity of the connecting hole. The end of the detection probe 41 is in contact with the inner wall of the threaded groove. The connecting plate 42 is slidably disposed inside the integrated housing 2. The other end of the detection probe 41 is fixedly connected to the connecting plate 42. Figure 3 As shown, when the connecting screw 3 is connected to the inner cylinder 1, the connecting screw 3 is separated from the connecting plate 42, thus avoiding the connecting screw 3 from obstructing the connecting plate 42 and affecting the detection accuracy of the inner cylinder 1. When the connecting screw 3 is separated from the inner cylinder 1, the connecting screw 3 can squeeze the connecting plate 42, causing the connecting plate 42 to move the detection probe 41 toward the interior of the integrated housing 2, so as to facilitate the installation or separation of the detection probe 41. The detection terminal 43 is set inside the integrated housing 2, and the pressure sensor 44 is installed on the detection terminal 43. The pressure sensor 44 is used to detect the extrusion force on the detection probe 41. The detection terminal 43 consists of a housing, a battery, a control circuit board, and a wireless communication module. The battery can provide power for the operation of the pressure sensor 44, the control circuit board, and the wireless communication module. The data detected by the pressure sensor 44 can be transmitted to the outside through the control circuit board and the wireless communication module, so as to analyze the deformation state of the inner cylinder 1 based on the data detected by the pressure sensor 44.

[0026] Furthermore, the detection unit 4 also includes a first mounting plate 45, a second mounting plate 46, and a limiting spring 48. The first mounting plate 45 is slidably mounted inside the integrated housing 2, and the detection terminal 43 is fixedly mounted on the top of the first mounting plate 45. The second mounting plate 46 is slidably mounted inside the integrated housing 2 and is located on the side of the pressure sensor 44 away from the detection terminal 43. The limiting spring 48 is located inside the integrated housing 2, with one end of the limiting spring 48 pressed against the connecting plate 42. The limiting spring 48 is located on the side opposite to the first mounting plate 45 and the second mounting plate 46. When the distance between the two connecting screws 3 and the inner cylinder 1 changes, the distance between the two detection probes 41 changes, which in turn changes the distance between the two connecting plates 42, causing the compression deformation of the limiting spring 48 to change. The pressure sensor 44 then detects the elastic change of the limiting spring 48, and the deformation size of the inner cylinder 1 can be determined based on the elastic coefficient of the limiting spring 48.

[0027] Specifically, the detection unit 4 also includes a guide rod 47 and a limiting collar 49. The guide rod 47 is disposed inside the integrated housing 2. Through holes are provided on the connecting plate 42, the first mounting plate 45, and the second mounting plate 46. The outer wall of the guide rod 47 is slidably sleeved with the through holes. The guide rod 47 can ensure the stability of the connection between the connecting plate 42, the first mounting plate 45, and the second mounting plate 46 inside the integrated housing 2. The limiting collar 49 is fixedly connected inside the integrated housing 2. The end of the guide rod 47 is slidably sleeved with the limiting collar 49. The limiting collar 49 can limit the guide rod 47. By disassembling the first housing 21 and the second housing 22, the guide rod 47 can be disassembled to facilitate the disassembly and maintenance of the connecting plate 42, the first mounting plate 45, and the second mounting plate 46.

[0028] The method of using anti-deformation tooling includes the following steps: Step 1: Rotate the connecting screw 3 toward the interior of the integrated housing 2 so that the distance between the opposite ends of the connecting screws 3 at both ends of the integrated housing 2 is less than the width of the support mounting point of the inner cylinder 1. Then, thread the connecting screw 3 at the end of the integrated housing 2 to the threaded groove on the inner cylinder 1, and use the first locking nut 5 and the second locking nut 6 to lock and limit the connecting screw 3. Step 2: The integrated housing 2 and connecting screw 3 support and limit the inner cylinder 1, and when the inner cylinder 1 is being processed, the detection unit 4 detects the state of the inner cylinder 1 in real time. Step 3: After the inner cylinder part 1 is processed, loosen the first locking nut 5 and the second locking nut 6 to separate the connecting screw 3 from the inner cylinder part 1, and disassemble the integrated housing 2 and the connecting screw 3.

[0029] Step 2, the detection unit 4, performs real-time detection of the condition of the inner cylinder component 1, including the following steps: S2.1: When the integrated housing 2 and the connecting screw 3 are installed on the inner cylinder 1, the end of the detection probe 41 is pressed against the inner wall of the threaded groove on the inner cylinder 1. The limiting spring 48 acts on the detection probe 41 with an elastic compressive force through the connecting plate 42. The pressure sensor 44 detects the elastic compressive force on the limiting spring 48 through the first mounting plate 45 and the second mounting plate 46. S2.2: By judging the change in the value detected by pressure sensor 44, we can analyze whether the inner cylinder 1 has deformed. That is, when the inner cylinder 1 is in a static state, the value detected by pressure sensor 44 is set as the standard value, and then the standard error is set. The standard error is the range of fluctuation of the value detected by pressure sensor 44 within the allowable deformation range during the processing of inner cylinder 1. The standard error is obtained by recording data from multiple experiments. By judging whether the change in the value detected by pressure sensor 44 is within the standard error, we can determine whether the inner cylinder 1 has deformed and been damaged. That is, if the change in the value detected by pressure sensor 44 is within the standard error, then the inner cylinder 1 has not deformed and been damaged. Conversely, if the change in the value detected by pressure sensor 44 is not within the standard error, then the inner cylinder 1 has deformed and been damaged.

[0030] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A deformation-resistant tooling for installing and adjusting the sealing ring of the low-pressure inner cylinder of a steam turbine, installed on the inner cylinder component (1), characterized in that: include: An integrated housing (2) is disposed on the inner cylinder component (1); A connecting screw (3) is threadedly installed at the end of the integrated housing (2). A threaded groove is provided on the inner cylinder (1). One end of the outer wall of the connecting screw (3) is threadedly connected to the inner cavity of the threaded groove. The detection unit (4) is located inside the integrated housing (2) and is used to detect the status of the inner cylinder (1).

2. The anti-deformation tooling for installing and adjusting the sealing ring of the low-pressure inner cylinder of a steam turbine according to claim 1, characterized in that: Also includes: The first locking nut (5) is threaded onto the outside of the connecting screw (3), and the first locking nut (5) is pressed against the end of the integrated housing (2); The second locking nut (6) is threaded onto the outside of the connecting screw (3). The second locking nut (6) is pressed against the inner wall of the inner cylinder (1). A planar notch is provided at the end of the outer wall of the connecting screw (3).

3. The anti-deformation tooling for installing and adjusting the sealing ring of the low-pressure inner cylinder of a steam turbine according to claim 1, characterized in that: The integrated housing (2) includes: A first housing (21) and a second housing (22) are arranged symmetrically. The threaded hole (25) is respectively opened at one end opposite to the first housing (21) and the second housing (22), and the other end of the outer wall of the connecting screw (3) is threadedly connected to the threaded hole (25).

4. The anti-deformation tooling for installing and adjusting the sealing ring of the low-pressure inner cylinder of a steam turbine according to claim 3, characterized in that: The integrated housing (2) includes: A fixing plate (23) is disposed on the side of the first housing (21) and the second housing (22); Fixing bolt (24), the fixing bolt (24) is disposed on one side of fixing plate (23), and the outer wall of the fixing bolt (24) is threadedly connected to the first housing (21) and the second housing (22) respectively; The limiting plate (26) is fixedly connected to the inner walls of the first housing (21) and the second housing (22) on one side, and the limiting plate (26) is used to limit the detection unit (4).

5. The anti-deformation tooling for installing and adjusting the sealing ring of the low-pressure inner cylinder of a steam turbine according to claim 4, characterized in that: The detection unit (4) includes: The detection probe (41) has a connecting hole at the end of the connecting screw (3), the outer wall of the detection probe (41) is slidably sleeved with the inner cavity of the connecting hole, and the end of the detection probe (41) is in contact with the inner wall of the thread groove. A connecting plate (42) is slidably disposed inside the integrated housing (2), and the other end of the detection probe (41) is fixedly connected to the connecting plate (42).

6. The anti-deformation tooling for installing and adjusting the sealing ring of the low-pressure inner cylinder of a steam turbine according to claim 5, characterized in that: The detection unit (4) further includes: The detection terminal (43) is disposed inside the integrated housing (2); A pressure sensor (44) is installed on the detection terminal (43) and is used to detect the extrusion force on the detection probe (41).

7. The anti-deformation tooling for installing and adjusting the sealing ring of the low-pressure inner cylinder of a steam turbine according to claim 6, characterized in that: The detection unit (4) further includes: The first mounting plate (45) is slidably mounted inside the integrated housing (2), and the detection terminal (43) is fixedly mounted on the top of the first mounting plate (45); The second mounting plate (46) is slidably mounted inside the integrated housing (2) and is located on the side of the pressure sensor (44) away from the detection terminal (43). A limiting spring (48) is disposed inside the integrated housing (2). One end of the limiting spring (48) is pressed against the connecting plate (42). The limiting spring (48) is located on the opposite side of the first mounting plate (45) and the second mounting plate (46).

8. The anti-deformation tooling for installing and adjusting the sealing ring of the low-pressure inner cylinder of a steam turbine according to claim 7, characterized in that: The detection unit (4) further includes: Guide rod (47) is disposed inside the integrated housing (2). Through holes are provided on the connecting plate (42), the first mounting plate (45) and the second mounting plate (46). The outer wall of the guide rod (47) is slidably sleeved with the through hole. A limiting collar (49) is fixedly connected to the inside of the integrated housing (2), and the end of the guide rod (47) is slidably sleeved with the limiting collar (49).

9. The anti-deformation tooling for installing and adjusting the sealing ring of the low-pressure inner cylinder of a steam turbine according to claim 8, characterized in that: The method of using anti-deformation tooling includes the following steps: Step 1: Rotate the connecting screw (3) toward the interior of the integrated housing (2) so that the distance between the opposite ends of the connecting screws (3) at both ends of the integrated housing (2) is less than the width of the support mounting point of the inner cylinder (1). Then, thread the connecting screw (3) at the end of the integrated housing (2) to the threaded groove on the inner cylinder (1) and use the first locking nut (5) and the second locking nut (6) to lock and limit the connecting screw (3). Step 2: The integrated housing (2) and connecting screw (3) support and limit the inner cylinder (1), and when the inner cylinder (1) is being processed, the detection unit (4) detects the state of the inner cylinder (1) in real time; Step 3: After the inner cylinder part (1) is processed, loosen the first locking nut (5) and the second locking nut (6) to separate the connecting screw (3) from the inner cylinder part (1) and disassemble the integrated housing (2) and the connecting screw (3).

10. The anti-deformation tooling for installing and adjusting the sealing ring of the low-pressure inner cylinder of a steam turbine according to claim 9, characterized in that: The detection unit (4) in step two performs real-time detection of the state of the inner cylinder component (1), including the following steps: S2.1: When the integrated housing (2) and the connecting screw (3) are installed on the inner cylinder (1), the end of the detection probe (41) is pressed against the inner wall of the threaded groove on the inner cylinder (1), and the limiting spring (48) acts on the detection probe (41) with an elastic compressive force through the connecting plate (42). The pressure sensor (44) detects the elastic compressive force on the limiting spring (48) through the first mounting plate (45) and the second mounting plate (46). S2.2: By judging the change in the value detected by the pressure sensor (44), we can analyze whether the inner cylinder (1) has deformed. That is, when the inner cylinder (1) is in a static state, the value detected by the pressure sensor (44) is set as the standard value, and then the standard error is set. By judging whether the change in the value detected by the pressure sensor (44) is within the standard error, we can determine whether the inner cylinder (1) has deformed and been damaged. That is, if the change in the value detected by the pressure sensor (44) is within the standard error, then the inner cylinder (1) has not deformed and been damaged. Conversely, if the change in the value detected by the pressure sensor (44) is not within the standard error, then the inner cylinder (1) has deformed and been damaged.

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