Measuring device and measuring method for out-of-roundness of a boiler pressure vessel shell

Abstract

This invention relates to a measuring device and method for measuring the out-of-roundness of boiler pressure vessel cylinders, comprising a telescopic frame and a ranging device. The ends of the first, second, and third telescopic sections are extendable, so that the extension axes of the second and third telescopic sections coincide with the chord length of the boiler pressure vessel, which is equal in length and parallel to the chord length. This, in turn, causes the rotation axis of the ranging device to coincide with the axis of the boiler pressure vessel. The advantages are that by determining the center and then rotating to measure the full circumference diameter, the measurement results are highly accurate. Simultaneously, the rotational measurement method allows for rapid measurement in a short time, thus improving measurement efficiency. Since the telescopic frame can internally clamp the boiler pressure vessel, it has excellent adaptability to boiler pressure vessels with different inner diameters, thereby greatly improving the flexibility of the measuring device for the out-of-roundness of boiler pressure vessel cylinders.

Description

Technical Field

[0001] This invention relates to the technical field of boiler measurement, specifically to a measuring device and method for measuring the out-of-roundness of boiler pressure vessel cylinders. Background Technology

[0002] During the manufacturing, installation, periodic inspection, and modification of boiler and pressure vessel shells, specific regulations are made regarding the out-of-roundness (the difference between the maximum and minimum diameters within the same cross-section). Therefore, measuring out-of-roundness is an indispensable step, and the accuracy of this measurement is key data for evaluating the quality of the shell's manufacturing, installation, and modification.

[0003] Currently, measuring the out-of-roundness of cylinders is quite difficult. Generally, measuring tools such as steel rulers and laser rangefinders are used to measure the maximum and minimum diameters and then calculate the result. However, due to the location of the container in use and its large diameter, the measurement process is extremely difficult, and it is not convenient to obtain relevant data on the full circumference diameter within the corresponding cross-sectional range. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a measuring device and method for measuring the out-of-roundness of boiler pressure vessel cylinders. It solves the problem that the measurement of cylinder out-of-roundness in the prior art is difficult. Generally, measuring tools such as steel rulers and laser rangefinders are used to measure the maximum and minimum diameters and then calculate them. However, due to the location of the container in use and the large diameter, the measurement process is extremely difficult and it is not convenient to obtain the relevant data for measuring the full circumference diameter within the corresponding cross-sectional range.

[0006] (II) Technical Solution

[0007] A first aspect of the present invention provides a measuring device for the out-of-roundness of a boiler pressure vessel shell, comprising a telescopic frame and a ranging device. The telescopic frame is detachably disposed inside the boiler pressure vessel. The ranging device is directly or indirectly connected to the telescopic frame and is rotatable about the axis of the boiler pressure vessel. The telescopic frame includes a first telescopic part, a second telescopic part, a third telescopic part, and a contact part. The second and third telescopic parts are correspondingly disposed at both ends of the first telescopic part. The ranging device is disposed in the first telescopic part, and the contact part is correspondingly disposed at both ends of the third telescopic part of the second telescopic part. The contact part is supported on the inner wall of the boiler pressure vessel. The first, second, and third telescopic parts form an I-shape. The ends of the first, second, and third telescopic parts are telescopic, so that the extension axes of the second and third telescopic parts coincide with the chord length of the boiler pressure vessel, which is equal in length and parallel to the chord length, thereby aligning the rotation axis of the ranging device with the axis of the boiler pressure vessel.

[0008] In this technical solution, the measuring device includes a telescopic frame and a distance measuring device. The distance measuring device is located on the telescopic frame, which can be supported on the inner wall of the boiler pressure vessel. The rotation axis of the distance measuring device must be aligned with the axis of the boiler pressure vessel. During the rotation of the distance measuring device, the out-of-roundness of the boiler pressure vessel can be measured.

[0009] In this invention, the telescopic frame can achieve self-centering clamping, that is, ensure that the rotation axis of the measuring device can be aligned with the axis of the boiler pressure vessel, and limit the axial position of the measuring device relative to the boiler pressure vessel. In this way, the rotational stability of the measuring device within the boiler pressure vessel can be guaranteed, thereby ensuring the measurement accuracy of the boiler pressure vessel.

[0010] By controlling the extension of the ends of the first, second, and third telescopic parts, the axes of the second and third telescopic parts can be made to coincide with the chord lengths of the boiler pressure vessel cross-section, which are equal in length and parallel to each other. Since the three parts form an I-shape, the telescopic axis of the first telescopic part can be made to coincide with the diameter of the boiler pressure vessel. Furthermore, since the ranging device is located in the middle of the first telescopic part, the rotation axis of the ranging device can be made to coincide with the axis of the boiler pressure vessel, so that its out-of-roundness can be measured.

[0011] Compared with the prior art, the present invention uses a method of determining the center and then rotating to measure the full circumference diameter, which ensures a high degree of accuracy in the measurement results. At the same time, the rotation measurement method can complete the measurement quickly in a short time, thereby improving the measurement efficiency.

[0012] Meanwhile, since the telescopic frame can clamp the boiler pressure vessel internally, and the first telescopic part, the second telescopic part, and the third telescopic part are all detachable, the telescopic frame has a good adaptability to boiler pressure vessels with different inner diameters, which can greatly improve the flexibility of the device for measuring the out-of-roundness of boiler pressure vessel cylinders.

[0013] In one technical solution of the present invention, the first telescopic part, the second telescopic part, and the third telescopic part each include a connecting part and two coaxial telescopic units, which are disposed on both sides of the corresponding connecting part; each telescopic unit includes a rotating shaft, a sliding sleeve, a travel sleeve, and a connecting part, the rotating shaft is rotatably connected to the connecting part, the travel sleeve is fixedly connected to the connecting part, the rotating shaft is drivenly connected to the first driving member, the rotating shaft and the sliding sleeve are threadedly engaged, and the sliding sleeve and the travel sleeve are slidably connected; the sliding sleeve corresponding to the first telescopic part is connected to the connecting part corresponding to the second telescopic part and the third telescopic part, and the sliding sleeve corresponding to the second telescopic part and the third telescopic part is connected to the corresponding contact part, wherein, when the two coaxial rotating shafts rotate, the two coaxial sliding sleeves can be brought closer to each other or moved away from each other.

[0014] In this technical solution, the first telescopic part, the second telescopic part, and the third telescopic part all include a connecting part and two coaxial telescopic units. The coaxial telescopic units extend and retract synchronously. When the two telescopic units corresponding to the first telescopic part extend and retract synchronously, they can drive the second telescopic member and the third telescopic member to extend and retract synchronously. When the two telescopic units corresponding to the second telescopic member and the third telescopic member extend and retract synchronously, they can drive the corresponding contact parts to extend and retract synchronously.

[0015] For the entire telescopic frame, the contact part can be adjusted along the diameter direction of the boiler pressure vessel cross-section and along the chord length direction of the boiler pressure vessel cross-section. This allows the telescopic frame to internally clamp the boiler pressure vessel while ensuring that the rotation axis of the measuring device coincides with the axis of the boiler pressure vessel. The telescopic frame has good adaptability to boiler pressure vessels with different inner diameters, thereby further improving the flexibility of the device for measuring the out-of-roundness of boiler pressure vessel cylinders.

[0016] Coaxial travel sleeves are fixed on both sides of the connecting part. A sliding sleeve is slidably connected inside the travel sleeve. The sliding sleeve and the travel sleeve cannot rotate relative to each other. This can be achieved by setting matching sliders and grooves on the mating surfaces of the two.

[0017] Since the sliding sleeve is threadedly fitted to the rotating shaft, and the rotating shaft is rotatably connected to the connecting part, when the rotating shaft rotates, it can drive the sliding sleeve to slide along the axis of the travel sleeve, thereby driving the end component of the sliding sleeve to slide together, realizing the extension and retraction of the telescopic unit.

[0018] The first driving component can be a drive motor, the output end of which is connected to a worm. The coaxial shaft can be an integral structure with a worm wheel meshing with the worm on the shaft. In order to ensure that the coaxial sliding sleeve can extend and retract synchronously, the threads on the coaxial sliding sleeve need to be set to have equal pitch and opposite directions.

[0019] In one technical solution of the present invention, the contact part includes a connecting rod and a contact rod. The contact rod is disposed on both sides of the connecting rod. The connecting rod is directly or indirectly hinged to the corresponding sliding sleeve along the axial direction of the boiler pressure vessel, so that the contact rod can swing along the axial direction of the boiler pressure vessel. The contact rod has at least two contact points that can maintain contact with the boiler pressure vessel.

[0020] In this technical solution, the contact part includes a connecting rod and a contact rod. The connecting rod is hinged to the corresponding sliding sleeve, allowing the contact rod to swing along the axis of the boiler pressure vessel. During the contact process with the inner wall of the boiler pressure vessel, the contact rod will swing passively until both contact points of the contact rod are fully in contact with the inner wall of the boiler pressure vessel, thus ensuring the stability of the telescopic frame inside the boiler pressure vessel.

[0021] The contacts can be made of hard rubber, and reinforcing yarns can be placed inside the wear-resistant contacts. This not only improves the wear resistance but also ensures that the contacts have sufficient hardness to prevent large elastic deformation from affecting the measurement accuracy of the measuring device.

[0022] Specifically, the hardness of the wear-resistant contacts should be lower than the hardness of the inner wall of the boiler pressure vessel, thereby ensuring that the boiler pressure vessel is not easily damaged by the wear-resistant contacts.

[0023] In one technical solution of the present invention, the measuring device for the out-of-roundness of the boiler pressure vessel shell further includes a connecting frame, and the contact part is connected to the corresponding sliding sleeve through the connecting frame.

[0024] In this technical solution, the connecting frame is used to connect the contact part and the sliding sleeve, and the connecting frame and the sliding sleeve can be configured as a threaded connection.

[0025] In one embodiment of the present invention, the measuring device for the out-of-roundness of the boiler pressure vessel cylinder further includes an elastic element, which provides elastic force to the contact portion to maintain a regular position.

[0026] In this technical solution, the elastic element is used to provide elastic force to the contact part to maintain a regular position. The elastic element can be set as a tension spring, and the regular position can be set as the position where the contact parts corresponding to the coaxial telescopic unit converge with each other. This allows the contact part itself to maintain a regular state without shaking during the process of the telescopic frame extending into or moving out of the boiler pressure vessel, thus avoiding collision between the contact part and the inner wall of the boiler pressure vessel.

[0027] Specifically, the two ends of the tension spring can be respectively set on the connecting frame and the contact part.

[0028] In one technical solution of the present invention, the measuring device for measuring the out-of-roundness of the boiler pressure vessel cylinder further includes a second driving member, and the ranging device is connected to the connecting part corresponding to the first telescopic part through the second driving member.

[0029] The second driving component is configured to drive the ranging device to rotate around the axis of the boiler pressure vessel, and is also configured to drive the ranging device to extend and retract along the axis of the boiler pressure vessel.

[0030] In this technical solution, the second driving component can be configured as a combination of a telescopic driving component and a rotary driving component, thereby driving the ranging device to not only rotate to realize the out-of-roundness detection of a predetermined area of ​​the boiler pressure vessel, but also to change the detection area of ​​the boiler pressure vessel by telescopic movement, so that the operator can realize the all-round out-of-roundness detection of the inner wall of the boiler pressure vessel with a single clamping.

[0031] Specifically, it can be configured as a component combining a rotary motor and a telescopic rod.

[0032] In one technical solution of the present invention, the measuring device for the out-of-roundness of the boiler pressure vessel cylinder further includes a level, which can be mounted on the rotary drive component.

[0033] In this technical solution, a level is used to measure the levelness of the distance measuring device. Since the boiler pressure vessel is often set on a horizontal ground during the measurement of the inner wall out-of-roundness, when the level measures that the telescopic frame is not horizontal, the telescopic frame can be manually fine-tuned to improve the coincidence of the rotation axis of the distance measuring device with the axis of the boiler pressure vessel.

[0034] In one technical solution of the present invention, at least two sets of ranging devices are provided, and the two sets of ranging devices have opposite measuring directions and extend along the same diameter direction of the boiler pressure vessel.

[0035] In this technical solution, the ranging device is set into two sets. The ranging device can be set to either a laser rangefinder or an ultrasonic rangefinder. After the rotation axis of the ranging device coincides with the axis of the boiler pressure vessel, only half a revolution is needed to measure the out-of-roundness of the boiler pressure vessel, thereby further improving the measurement efficiency of the measuring device.

[0036] A second aspect of the present invention provides a method for measuring the out-of-roundness of a boiler pressure vessel shell, applicable to the measuring device for the out-of-roundness of a boiler pressure vessel shell in any of the above-described technical solutions, comprising:

[0037] S1: Adjust the size of the telescopic frame so that it is smaller than the inner contour size of the boiler pressure vessel;

[0038] S2: Extend the telescopic frame into the boiler pressure vessel and adjust the telescopic frame until the rotation axis of the ranging device coincides with the axis of the boiler pressure vessel.

[0039] S3: Adjust the size of the telescopic frame to increase until the four contact parts are tensioned to the inner wall of the boiler pressure vessel;

[0040] S4: Control the rotation of the ranging device to measure the out-of-roundness of the boiler pressure vessel.

[0041] In this technical solution, the first step is to ensure that the size of the telescopic frame is smaller than the internal outline of the boiler pressure vessel so that it can be smoothly inserted into the boiler pressure vessel. Then, the telescopic frame is adjusted until it tensions the boiler pressure vessel and achieves self-centering clamping. At the same time, it is ensured that the axis of the boiler pressure vessel coincides with the rotation axis of the ranging device. Then, the rotation of the ranging device can be controlled to achieve the measurement of the out-of-roundness of the corresponding position of the boiler pressure vessel.

[0042] (III) Beneficial Effects

[0043] The present invention proposes a measuring device and method for measuring the out-of-roundness of boiler pressure vessel cylinders. The measuring device includes a telescopic frame and a distance measuring device. The distance measuring device is located on the telescopic frame, which can be supported on the inner wall of the boiler pressure vessel. The rotation axis of the distance measuring device should coincide with the axis of the boiler pressure vessel. During the rotation of the distance measuring device, the out-of-roundness of the boiler pressure vessel can be measured.

[0044] In this invention, the telescopic frame can achieve self-centering clamping, that is, ensure that the rotation axis of the measuring device can be aligned with the axis of the boiler pressure vessel, and limit the axial position of the measuring device relative to the boiler pressure vessel. In this way, the rotational stability of the measuring device within the boiler pressure vessel can be guaranteed, thereby ensuring the measurement accuracy of the boiler pressure vessel.

[0045] By controlling the extension of the ends of the first, second, and third telescopic parts, the axes of the second and third telescopic parts can be made to coincide with the chord lengths of the boiler pressure vessel cross-section, which are equal in length and parallel to each other. Since the three parts form an I-shape, the telescopic axis of the first telescopic part can be made to coincide with the diameter of the boiler pressure vessel. Furthermore, since the ranging device is located in the middle of the first telescopic part, the rotation axis of the ranging device can be made to coincide with the axis of the boiler pressure vessel, so that its out-of-roundness can be measured.

[0046] Compared with the prior art, the present invention uses a method of determining the center and then rotating to measure the full circumference diameter, which ensures a high degree of accuracy in the measurement results. At the same time, the rotation measurement method can complete the measurement quickly in a short time, thereby improving the measurement efficiency.

[0047] Meanwhile, since the telescopic frame can clamp the boiler pressure vessel internally, and the first telescopic part, the second telescopic part, and the third telescopic part are all detachable, the telescopic frame has a good adaptability to boiler pressure vessels with different inner diameters, which can greatly improve the flexibility of the device for measuring the out-of-roundness of boiler pressure vessel cylinders. Attached Figure Description

[0048] Figure 1This is one of the structural schematic diagrams of the measuring device of the present invention;

[0049] Figure 2 This is a second schematic diagram of the measuring device of the present invention;

[0050] Figure 3 This is a schematic diagram of the structure of the telescopic unit of the present invention;

[0051] Figure 4 This is a schematic diagram of the structure of the rotating shaft, sliding sleeve, and worm gear of the present invention;

[0052] Figure 5 This is a schematic diagram of the structure of the connecting frame, elastic element, and contact portion of the present invention;

[0053] Figure 6 This is a schematic diagram of the structure of the first telescopic part, the connecting part, the second driving member, and the ranging device of the present invention.

[0054] [Explanation of Labels in the Attached Image]

[0055] 1: Telescopic frame;

[0056] 11: First telescopic part; 12: Second telescopic part; 13: Third telescopic part;

[0057] A: Telescopic unit; A1: Rotating shaft; A2: Sliding sleeve; A3: Stroke sleeve; A4: Connecting part; A5: First driving component; A6: Transmission component; A61: Worm gear; A62: Worm wheel;

[0058] 14: Contact part; 141: Linkage rod; 142: Contact rod; 143: Contact point;

[0059] 2: Distance measuring device;

[0060] 3: Connecting bracket;

[0061] 4: Elastic components;

[0062] 5: Second drive component. Detailed Implementation

[0063] To better explain and facilitate understanding of this invention, the following description is provided in conjunction with the appendix. Figure 1-6 The present invention will be described in detail through specific embodiments.

[0064] Example 1:

[0065] Reference Figures 1 to 6This invention provides a measuring device for the out-of-roundness of a boiler pressure vessel shell, comprising a telescopic frame 1 and a measuring device 2. The telescopic frame 1 is detachably installed inside the boiler pressure vessel. The measuring device 2 is directly or indirectly connected to the telescopic frame 1 and is rotatable around the axis of the boiler pressure vessel. The telescopic frame 1 includes a first telescopic part 11, a second telescopic part 12, a third telescopic part 13, and a contact part 14. The second telescopic part 12 and the third telescopic part 13 are correspondingly located at both ends of the first telescopic part 11. The measuring device 2 is located at the first telescopic part 11. The retractable portion 11 and the contact portion 14 are respectively provided at both ends of the third telescopic portion 13 of the second telescopic portion 12. The contact portion 14 is supported on the inner wall of the boiler pressure vessel. The first telescopic portion 11, the second telescopic portion 12 and the third telescopic portion 13 form an I-shape. The two ends of the first telescopic portion 11, the second telescopic portion 12 and the third telescopic portion 13 can extend and retract so that the extension axis of the second telescopic portion 12 and the third telescopic portion 13 coincides with the chord length of the boiler pressure vessel, which is equal in length and parallel to the chord length, thereby making the rotation axis of the ranging device 2 coincide with the axis of the boiler pressure vessel.

[0066] In this embodiment, the measuring device includes a telescopic frame 1 and a distance measuring device 2. The distance measuring device 2 is mounted on the telescopic frame 1, which is supported on the inner wall of the boiler pressure vessel. The rotation axis of the distance measuring device 2 is to coincide with the axis of the boiler pressure vessel. During the rotation of the distance measuring device 2, the out-of-roundness measurement of the boiler pressure vessel can be realized.

[0067] In this invention, the telescopic frame 1 can achieve self-centering clamping, that is, ensure that the rotation axis of the measuring device can be aligned with the axis of the boiler pressure vessel, and limit the axial position of the measuring device relative to the boiler pressure vessel. In this way, the rotational stability of the measuring device in the boiler pressure vessel can be guaranteed, thereby ensuring the measurement accuracy of the boiler pressure vessel.

[0068] By controlling the extension of the ends of the first telescopic part 11, the second telescopic part 12, and the third telescopic part 13, the axes of the second telescopic part 12 and the third telescopic part 13 can be made to coincide with the chord length of the boiler pressure vessel section, which is equal in length and parallel to the chord length. Since the three form an I-shape, the telescopic axis of the first telescopic part 11 can be made to coincide with the diameter of the boiler pressure vessel. Furthermore, since the ranging device 2 is located in the middle of the first telescopic part 11, the rotation axis of the ranging device 2 can be made to coincide with the axis of the boiler pressure vessel, so that its out-of-roundness can be measured.

[0069] Compared with the prior art, the present invention uses a method of determining the center and then rotating to measure the full circumference diameter, which ensures a high degree of accuracy in the measurement results. At the same time, the rotation measurement method can complete the measurement quickly in a short time, thereby improving the measurement efficiency.

[0070] Meanwhile, since the telescopic frame 1 can achieve internal clamping of the boiler pressure vessel, and the first telescopic part 11, the second telescopic part 12 and the third telescopic part 13 are all detachable, the telescopic frame 1 has a better adaptability to boiler pressure vessels with different inner diameters, thereby greatly improving the flexibility of the device for measuring the out-of-roundness of boiler pressure vessel cylinders.

[0071] The measuring device for measuring the out-of-roundness of boiler pressure vessel cylinders also includes a second drive component 5, and the distance measuring device 2 is connected to the connecting part A4 corresponding to the first telescopic part 11 through the second drive component 5.

[0072] The second driving component 5 is configured to drive the ranging device 2 to rotate around the axis of the boiler pressure vessel, and is also configured to drive the ranging device 2 to extend and retract along the axis of the boiler pressure vessel.

[0073] In this embodiment, the second driving member 5 can be configured as a combination of a telescopic driving member and a rotary driving member, thereby driving the ranging device 2 to not only rotate to realize the out-of-roundness detection of a predetermined area of ​​the boiler pressure vessel, but also to change the detection area of ​​the boiler pressure vessel by telescopic movement, so that the operator can realize the out-of-roundness detection of the inner wall of the boiler pressure vessel in a single clamping.

[0074] Specifically, it can be configured as a component combining a rotary motor and a telescopic rod.

[0075] Example 2:

[0076] Reference Figures 1 to 4 In addition to possessing all the technical solutions of the above embodiments, the embodiments of the present invention further possess the following technical solutions:

[0077] The first telescopic part 11, the second telescopic part 12, and the third telescopic part 13 each include a connecting part A4 and two coaxial telescopic units A, which are located on both sides of the corresponding connecting part A4. Each telescopic unit A includes a rotating shaft A1, a sliding sleeve A2, a travel sleeve A3, and a connecting part A4. The rotating shaft A1 is rotatably connected to the connecting part A4, and the travel sleeve A3 is fixedly connected to the connecting part A4. The rotating shaft A1 is driven by the first driving member A5. The rotating shaft A1 and the sliding sleeve A2 are threaded together, and the sliding sleeve A2 is slidably connected to the travel sleeve A3. The sliding sleeve A2 corresponding to the first telescopic part 11 is connected to the connecting part A4 corresponding to the second telescopic part 12 and the third telescopic part 13. The sliding sleeve A2 corresponding to the second telescopic part 12 and the third telescopic part 13 is connected to the corresponding contact part 14. When the two coaxial rotating shafts A1 rotate, the two coaxial sliding sleeves A2 can move closer to each other or further away from each other.

[0078] In this embodiment, the first telescopic part 11, the second telescopic part 12, and the third telescopic part 13 each include a connecting part A4 and two coaxial telescopic units A. The coaxial telescopic units A extend and retract synchronously. When the two telescopic units A corresponding to the first telescopic part 11 extend and retract synchronously, they can drive the second telescopic member and the third telescopic member to extend and retract synchronously. When the two telescopic units A corresponding to the second telescopic member and the third telescopic member extend and retract synchronously, they can drive the corresponding contact parts 14 to extend and retract synchronously.

[0079] For the entire telescopic frame 1, the contact part 14 can be adjusted along the diameter direction of the boiler pressure vessel cross-section and along the chord length direction of the boiler pressure vessel cross-section. This allows the telescopic frame 1 to internally clamp the boiler pressure vessel while ensuring that the rotation axis of the measuring device 2 coincides with the axis of the boiler pressure vessel. The telescopic frame 1 has a better adaptability to boiler pressure vessels with different inner diameters, thereby further improving the flexibility of the device for measuring the out-of-roundness of the boiler pressure vessel cylinder.

[0080] The connecting part A4 is fixed with coaxial travel sleeves A3 on both sides. A sliding sleeve A2 is slidably connected inside the travel sleeve A3. The sliding sleeve A2 and the travel sleeve A3 cannot rotate relative to each other. This can be achieved by setting matching sliders and grooves on the mating surfaces of the two.

[0081] Since the sliding sleeve A2 is threadedly engaged with the rotating shaft A1, and the rotating shaft A1 is rotatably connected to the connecting part A4, when the rotating shaft A1 rotates, it can drive the sliding sleeve A2 to slide along the axis of the travel sleeve A3, thereby driving the end component of the sliding sleeve A2 to slide together, realizing the extension and retraction of the telescopic unit A.

[0082] refer to Figure 3 and Figure 4 The first driving component A5 can be configured as a drive motor, and the output end of the drive motor is connected to the worm gear A61. The coaxial rotating shaft A1 can be configured as an integral structure. A worm wheel A62 that meshes with the worm gear A61 is provided on the rotating shaft A1. In order to ensure that the coaxial sliding sleeve A2 can extend and retract synchronously, the threads on the coaxial sliding sleeve A2 need to be configured as having equal pitch and opposite directions of rotation.

[0083] Example 3:

[0084] Reference Figure 5 In addition to possessing all the technical solutions of any of the above embodiments, the embodiments of the present invention further possess the following technical solutions:

[0085] The contact part 14 includes a connecting rod 141 and a contact rod 142. The contact rod 142 is located on both sides of the connecting rod 141. The connecting rod 141 is directly or indirectly hinged to the corresponding sliding sleeve A2 along the axial direction of the boiler pressure vessel, so that the contact rod 142 can swing along the axial direction of the boiler pressure vessel. The contact rod 142 has at least two contact points 143 that can maintain contact with the boiler pressure vessel.

[0086] In this embodiment, the contact part 14 includes a connecting rod 141 and a contact rod 142. The connecting rod 141 is hinged to the corresponding sliding sleeve A2, allowing the contact rod 142 to swing along the axial direction of the boiler pressure vessel. During the contact process with the inner wall of the boiler pressure vessel, the contact rod 142 will swing passively until both contact points 143 of the contact rod 142 are fully in contact with the inner wall of the boiler pressure vessel, thus ensuring the stability of the telescopic frame 1 inside the boiler pressure vessel.

[0087] The contact 143 can be made of hard rubber, and reinforcing yarn is set inside the wear-resistant contact 143. This not only improves the wear resistance, but also ensures that it has sufficient hardness to avoid large elastic deformation that would affect the measurement accuracy of the measuring device.

[0088] Specifically, the hardness of the wear-resistant contact 143 is lower than that of the inner wall of the boiler pressure vessel, thereby ensuring that the boiler pressure vessel is not easily damaged by the wear-resistant contact 143.

[0089] The measuring device for measuring the out-of-roundness of boiler pressure vessel cylinders also includes a connecting frame 3, and the contact part 14 is connected to the corresponding sliding sleeve A2 through the connecting frame 3.

[0090] In this embodiment, the connecting frame 3 is used to connect the contact part 14 and the sliding sleeve A2, and the connecting frame 3 and the sliding sleeve A2 can be configured as a threaded connection.

[0091] The measuring device for measuring the out-of-roundness of boiler pressure vessel shells also includes an elastic element 4, which provides a spring force to the contact portion 14 to maintain a regular position.

[0092] In this embodiment, the elastic element 4 is used to provide elastic force to the contact portion 14 to maintain a regular position. The elastic element 4 can be set as a tension spring, and the regular position can be set as the position where the contact portions 14 corresponding to the coaxial telescopic unit A converge with each other. This allows the contact portion 14 to maintain a regular state without shaking during the process of the telescopic frame 1 extending into or moving out of the boiler pressure vessel, thus preventing the contact portion 14 from colliding with the inner wall of the boiler pressure vessel.

[0093] Specifically, the two ends of the tension spring can be respectively set on the connecting frame 3 and the contact part 14.

[0094] Example 4:

[0095] In addition to possessing all the technical solutions of any of the above embodiments, the embodiments of the present invention further possess the following technical solutions:

[0096] The measuring device for the out-of-roundness of boiler pressure vessel shells also includes a level, which can be mounted on the rotary drive.

[0097] In this embodiment, a level is used to measure the levelness of the distance measuring device 2. Since the boiler pressure vessel is often set on a horizontal ground during the measurement of the inner wall non-roundness, when the level measures that the telescopic frame 1 is not horizontal, the telescopic frame 1 can be manually fine-tuned to improve the coincidence of the rotation axis of the distance measuring device 2 with the axis of the boiler pressure vessel.

[0098] Example 5:

[0099] Reference Figure 6 In addition to possessing all the technical solutions of any of the above embodiments, the embodiments of the present invention further possess the following technical solutions:

[0100] The ranging device 2 is configured in at least two sets, with the two sets of ranging devices 2 measuring in opposite directions and extending along the same diameter direction of the boiler pressure vessel.

[0101] In this embodiment, the ranging device 2 is configured as two sets. The ranging device 2 can be configured as either a laser rangefinder or an ultrasonic rangefinder. After the rotation axis of the ranging device 2 coincides with the axis of the boiler pressure vessel, only half a revolution is needed to measure the out-of-roundness of the boiler pressure vessel, thereby further improving the measurement efficiency of the measuring device.

[0102] Example 6:

[0103] An embodiment of the present invention provides a method for measuring the out-of-roundness of a boiler pressure vessel shell, applicable to the measuring device for the out-of-roundness of a boiler pressure vessel shell in any of the above embodiments, comprising:

[0104] S1: Adjust the size of the telescopic frame 1 so that it is smaller than the inner contour size of the boiler pressure vessel;

[0105] S2: Extend the telescopic frame 1 into the boiler pressure vessel and adjust the telescopic frame 1 until the rotation axis of the distance measuring device 2 coincides with the axis of the boiler pressure vessel.

[0106] S3: Adjust the size of the telescopic frame 1 to increase until the four contact parts 14 tighten the inner wall of the boiler pressure vessel;

[0107] S4: Control the rotation of the ranging device 2 to measure the out-of-roundness of the boiler pressure vessel.

[0108] In this embodiment, the first step is to ensure that the size of the telescopic frame 1 is smaller than the internal outline of the boiler pressure vessel so that it can be smoothly inserted into the boiler pressure vessel. Then, the telescopic frame 1 is adjusted until it tensions the boiler pressure vessel and achieves self-centering clamping. At the same time, the axis of the boiler pressure vessel is aligned with the rotation axis of the ranging device 2. Then, the ranging device 2 can be controlled to rotate to achieve the measurement of the out-of-roundness of the corresponding position of the boiler pressure vessel.

[0109] It can be understood that, except for conflicting parts, the above embodiments 1-6 can be freely combined to form other embodiments of the present invention.

[0110] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0111] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0112] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," or "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0113] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to those processes, articles, or apparatus / devices.

[0114] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A measuring device for the out-of-roundness of boiler pressure vessel cylinders, characterized in that: It includes a telescopic frame (1) and a distance measuring device (2). The telescopic frame (1) can be detachably installed inside the boiler pressure vessel. The distance measuring device (2) is directly or indirectly connected to the telescopic frame (1) and can rotate around the axis of the boiler pressure vessel. The telescopic frame (1) includes a first telescopic part (11), a second telescopic part (12), and a third telescopic part (13). The second telescopic part (12) and the third telescopic part (13) are respectively provided at both ends of the first telescopic part (11). The first telescopic part (11), the second telescopic part (12), and the third telescopic part (13) form an I-shape. The ranging device (2) is provided in the middle of the first telescopic part (11). Contact parts (14) are provided at both ends of the second telescopic part (12) and the third telescopic part (13). The contact parts (14) are supported on the inner wall of the boiler pressure vessel. Wherein, the two ends of the first telescopic part (11), the second telescopic part (12) and the third telescopic part (13) can extend and retract, so that the extension axis of the second telescopic part (12) and the third telescopic part (13) coincides with the chord length of the boiler pressure vessel, which is equal in length and parallel to the chord length, thereby making the rotation axis of the ranging device (2) coincide with the axis of the boiler pressure vessel; the first telescopic part (11), the second telescopic part (12) and the third telescopic part (13) each include a connecting part (A4) and two coaxial telescopic units (A), and the two coaxial telescopic units (A) are provided on both sides corresponding to the connecting part (A4); Both telescopic units (A) include a rotating shaft (A1), a sliding sleeve (A2), a travel sleeve (A3), and a connecting part (A4). The rotating shaft (A1) is rotatably connected to the connecting part (A4), and the travel sleeve (A3) is fixedly connected to the connecting part (A4). The rotating shaft (A1) is drivenly connected to the first driving member (A5). The rotating shaft (A1) and the sliding sleeve (A2) are threadedly engaged. The threads on both sides of the connecting part (A4) are set to have equal pitch and opposite directions. The sliding sleeve (A2) and the travel sleeve (A3) are slidably connected, and a matching slider and a groove are provided on their mating surfaces. The sliding sleeve (A2) corresponding to the first telescopic part (11) is connected to the connecting part (A4) corresponding to the second telescopic part (12) and the third telescopic part (13), and the sliding sleeve (A2) corresponding to the second telescopic part (12) and the third telescopic part (13) is connected to the corresponding contact part (14). When the two coaxial rotating shafts (A1) rotate, the two coaxial sliding sleeves (A2) can move closer to each other or further away from each other, thereby driving the corresponding contact parts (14) to extend and retract synchronously. The contact part (14) includes a connecting rod (141) and a contact rod (142). The contact rod (142) is located on both sides of the connecting rod (141). The connecting rod (141) is directly or indirectly hinged to the corresponding sliding sleeve (A2) along the axial direction of the boiler pressure vessel, so that the contact rod (142) can swing around the axial direction of the boiler pressure vessel. Each of the contact rods (142) has at least two contact points (143) that are able to maintain contact with the boiler pressure vessel.

2. The measuring device for the out-of-roundness of boiler pressure vessel cylinders as described in claim 1, characterized in that: The measuring device for measuring the out-of-roundness of the boiler pressure vessel cylinder also includes a connecting frame (3), and the contact part (14) is connected to the corresponding sliding sleeve (A2) through the connecting frame (3).

3. The measuring device for the out-of-roundness of boiler pressure vessel cylinders as described in claim 2, characterized in that: The measuring device for measuring the out-of-roundness of the boiler pressure vessel cylinder also includes an elastic element (4), which provides elastic force to the contact portion (14) to maintain a regular position.

4. The measuring device for the out-of-roundness of boiler pressure vessel cylinders as described in claim 1, characterized in that: The measuring device for measuring the out-of-roundness of the boiler pressure vessel cylinder also includes a second driving component (5), and the measuring device (2) is connected to the connecting part (A4) corresponding to the first telescopic part (11) through the second driving component (5).

5. The measuring device for the out-of-roundness of boiler pressure vessel cylinders as described in claim 4, characterized in that: The second driving member (5) is configured to drive the ranging device (2) to rotate around the axis of the boiler pressure vessel, and is also configured to drive the ranging device (2) to extend and retract along the axis of the boiler pressure vessel.

6. The measuring device for the out-of-roundness of boiler pressure vessel cylinders as described in claim 5, characterized in that: It also includes a level, which is located on the second drive unit (5).

7. The measuring device for the out-of-roundness of boiler pressure vessel cylinders as described in claim 6, characterized in that: The ranging device (2) is configured in at least two sets, with the two sets of ranging devices (2) having opposite measuring directions and extending along the same diameter direction of the boiler pressure vessel.

8. A method for measuring the out-of-roundness of a boiler pressure vessel shell, characterized in that: The method is applied to the measuring device for the out-of-roundness of boiler pressure vessel cylinders as described in any one of claims 1 to 7, comprising: S1: Adjust the size of the telescopic frame (1) so that it is smaller than the inner contour size of the boiler pressure vessel; S2: Insert the telescopic frame (1) into the boiler pressure vessel and adjust the telescopic frame (1) until the rotation axis of the distance measuring device (2) coincides with the axis of the boiler pressure vessel; S3: Adjust the size of the telescopic frame (1) to increase until the four contact parts (14) tension the inner wall of the boiler pressure vessel; S4: Control the rotation of the ranging device (2) to perform out-of-roundness measurement of the boiler pressure vessel.

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