A device and method for visual inspection of a steam turbine cylinder

Abstract

The present invention discloses a device and method for visual inspection inside a steam turbine cylinder, and relates to the technical field of steam turbines, wherein the inspection device comprises: a mounting seat; a moving wheel group, which is arranged at the bottom of the mounting seat, and the moving wheel group is used for moving on the inner wall of the steam turbine; and a conveying component, which is rotatably arranged on the mounting seat, and the conveying component is used for conveying detection instruments; the technical solution provided by the present invention can complete the inspection of the inside of the steam turbine without stopping or reducing the downtime, greatly reducing the time required for operations such as cooling and cylinder opening construction, and can also avoid long-term shutdown maintenance, reduce maintenance costs, and by accurately controlling the position and angle of the detection instrument, it can penetrate into areas that ordinary endoscopes cannot reach, obtain more detailed and accurate internal conditions, improve the flexibility of inspection, and expand the scope of application.

Description

Technical Field

[0001] The invention relates to the technical field of steam turbines, and in particular to a peeping inspection device for a steam turbine cylinder. Background Art

[0002] In modern thermal power plants, large steam turbine units are core equipment, and their stable operation is crucial to power supply. However, in actual operation, various abnormalities will inevitably occur in steam turbine units. If these abnormalities are not handled in time, it may cause equipment damage or even accidents. At present, the monitoring of the internal conditions of steam turbine units mainly relies on the analysis of data provided by online measuring instruments. Although this indirect method can reflect the working status of the unit to a certain extent, it is difficult to provide accurate information for specific problems in some hidden parts. When a more detailed inspection is required, the traditional industrial endoscope is a common tool. The camera is sent into the pipeline through soft and hard data cables to obtain internal image data. However, in the face of complex structures, multiple bends, narrow spaces and pores in high temperature environments, traditional endoscopes are often unable to do so and cannot penetrate into key areas for effective inspection. If further inspection is required, the steam turbine needs to be shut down and the cylinder needs to be opened for inspection after cooling, which not only increases maintenance time and cost, but also affects the stability of power supply. Summary of the invention

[0003] The main purpose of the present invention is to provide a device and method for endoscopic inspection of a steam turbine cylinder, aiming to solve the technical problem that an endoscope cannot be inserted into the steam turbine cylinder for deep inspection.

[0004] To achieve the above-mentioned purpose, the present invention provides a device for visual inspection in a steam turbine cylinder, comprising: Mounting seat; A driving structure, disposed on the mounting seat; A moving wheel set is arranged at the bottom of the mounting seat, and the driving structure is drivingly connected to the moving wheel set to drive the moving wheel set to drive the mounting seat to move on the inner wall of the steam turbine; and A conveying assembly is rotatably arranged on the mounting seat, and the conveying assembly is used for conveying the detection instrument.

[0005] In one embodiment, the detection instrument is configured as an industrial endoscope, the industrial endoscope includes a data line and a first camera installed at the end of the data line, and the conveying assembly includes: A housing, rotatably mounted on the mounting seat; A conveying wheel assembly is rotatably mounted on the shell, the conveying wheel assembly includes two conveying wheels, and the two conveying wheels are arranged at an interval. The data line is arranged in the interval between the two conveying wheels and contacts the conveying wheels on both sides. The conveying wheels rotate to make the data line be conveyed outward or retracted inward.

[0006] In one embodiment, the conveying assembly further includes a first rotating structure, the first rotating structure includes a first driving motor and a first rotating shaft, the first driving motor is disposed in the housing, and the output end of the first driving motor is connected to the first rotating shaft, and the other end of the first rotating shaft is connected to the conveying wheel; And / or, each of the conveying wheel groups includes at least two conveying wheel groups arranged in parallel; And / or, the conveying assembly further includes a second rotating structure, the second rotating structure includes a second driving motor and a second rotating shaft, the second driving motor is disposed in the mounting seat, and the second driving motor drives the shell to rotate via the second rotating shaft.

[0007] In one embodiment, the conveying assembly further comprises an elastic member, which is disposed on a side of each conveying wheel away from another conveying wheel, and has one end elastically connected to the conveying wheel and the other end elastically connected to the shell, and the elastic member is compressed so that the conveying wheel has a tendency to move toward the other conveying wheel.

[0008] In one embodiment, the device for peep inspection in a steam turbine cylinder further includes a second camera, and the second camera is mounted on the mounting seat.

[0009] In one embodiment, the device for in-cylinder inspection of a steam turbine further comprises an adsorption assembly, which is mounted on the bottom of the mounting seat and is used to be adsorbed on the inner wall of the steam turbine to press the moving wheel assembly against the inner wall of the steam turbine; Wherein, the adsorption component is configured as an electromagnetic coil, and the device for internal viewing inspection of a steam turbine cylinder further includes an electric control line, which is electrically connected to the electromagnetic coil.

[0010] In one embodiment, the device for endoscopic inspection of a steam turbine cylinder includes a plurality of mounting seats, each of the mounting seats is provided with at least one movable wheel group and at least one conveying assembly, and the plurality of mounting seats are arranged in series; adjacent mounting seats are connected in series via the electric control line.

[0011] In one embodiment, the device for in-cylinder inspection of a steam turbine further comprises a controller, which is disposed in the mounting seat and is electrically connected to the electric control line, the electromagnetic coil, the conveying assembly and the moving wheel set, respectively.

[0012] The present invention also provides a method for inspecting the inside of a steam turbine cylinder, which is applied to the inspection device described above. The inspection method comprises: The driving structure drives the moving wheel group to move, drives the mounting seat to enter the steam turbine, and moves on the inner wall of the steam turbine. The driving structure drives the moving wheel group to stay at the required detection position; In the steam turbine, the conveying assembly conveys the detection instrument to the area to be detected, and adjusts the angle of the detection instrument by rotating the conveying assembly.

[0013] In one embodiment, in the step of the driving structure driving the moving wheel group to move: multiple mounting seats are connected in series through electric control lines, and each mounting seat stays at a detection position, and the remaining mounting seats are driven into the interior of the turbine by the driving structure until the first mounting seat reaches the deepest part of the inner wall of the turbine.

[0014] In the technical solution of the present invention, the device for peek inspection in the steam turbine cylinder comprises a mounting seat, a moving wheel group is installed at the bottom of the mounting seat, the moving wheel group is used to carry the mounting seat to move in the steam turbine cylinder, and can be moved to a deeper position in the steam turbine cylinder, at least one conveying assembly is arranged above the mounting seat, the conveying assembly is used to convey the detection instrument, specifically, the inspection device extends into the steam turbine cylinder, moves inwardly through the moving wheel group, and stops at a position where inspection is required, such as a turning position. Since there are places in the cylinder that are difficult for the mounting seat to reach, the end of the clamped detection instrument can be pushed forward by the conveying assembly, and the conveying assembly can rotate relative to the mounting seat, that is, the inspection can be adjusted. The angle of the measuring instrument allows the detection range of the detection instrument to cover a wider range and obtain data from more perspectives, which is convenient for detecting hard-to-reach areas, especially those with multiple bends and narrow gaps. Compared with the cylinder opening inspection, this device can complete the inspection of the inside of the turbine without stopping or reducing the downtime, greatly reducing the time required for operations such as cooling and cylinder opening construction, and can also avoid long-term shutdown maintenance and reduce maintenance costs. By precisely controlling the position and angle of the detection instrument, it can penetrate into areas that ordinary endoscopes cannot reach, and obtain more detailed and accurate internal conditions, thereby improving the flexibility of inspection and expanding the scope of application. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0016] Figure 1 A schematic diagram of the structure of the device for visual inspection in a steam turbine cylinder provided by the present invention; Figure 2 A schematic structural diagram of another embodiment of the steam turbine cylinder internal viewing inspection device provided by the present invention; Figure 3 A schematic diagram of the structure of a series connection of a peek inspection device for a steam turbine cylinder provided by the present invention; Figure 4 A flow chart of the method for peek inspection in a steam turbine cylinder provided by the present invention.

[0017] Description of Figure Numbers: 10. Inspection device 100, mounting seat; 200, mobile wheel set; 300, conveying assembly; 310, housing; 320, conveying wheel assembly; 321, conveying wheel; 330, first rotating shaft; 340, second rotating shaft; 350, elastic member; 400, second camera; 500, electric control line; 510, socket; 600, adsorption components; 20. Testing instrument; 201. Data cable; 202. First camera.

[0018] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0021] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0022] In modern thermal power plants, large steam turbine units are core equipment, and their stable operation is crucial to power supply. However, in actual operation, various abnormalities will inevitably occur in steam turbine units. If these abnormalities are not handled in time, it may cause equipment damage or even accidents. At present, the monitoring of the internal conditions of steam turbine units mainly relies on the analysis of data provided by online measuring instruments. Although this indirect method can reflect the working status of the unit to a certain extent, it is difficult to provide accurate information for specific problems in some hidden parts. When a more detailed inspection is required, the traditional industrial endoscope is a common tool. The camera is sent into the pipeline through soft and hard data cables to obtain internal image data. However, in the face of complex structures, , multiple bends, narrow spaces, and pores in high-temperature environments. Traditional endoscopes are often unable to penetrate into key areas for effective inspection. Some intelligent robots have been tried for inspection in closed metal pipes and cylinders. However, due to their large size, the robots cannot enter small spaces, are expensive, and are inconvenient to use. If further detailed inspection is required, the turbine needs to be shut down and the cylinder opened for inspection after cooling. It usually takes 5-12 days to cool down from the rated operating temperature (540-600°C) according to the cooling rate specified by the turbine manufacturer. In addition, the cylinder opening overhaul construction usually requires a construction team of 60-80 people, and it takes 35-45 days to complete, which not only increases the maintenance time and cost, but also affects the stability of the power supply.

[0023] The invention provides a device and method for visual inspection in a steam turbine cylinder.

[0024] See also Figure 1 In one embodiment of the present invention, the device 10 for inspecting the inside of a steam turbine cylinder comprises: Mounting seat 100; A driving structure, disposed on the mounting seat 100; The moving wheel set 200 is disposed at the bottom of the mounting seat 100, and the driving structure drives and connects the moving wheel set 200 to drive the moving wheel set 200 to drive the mounting seat 100 to move on the inner wall of the steam turbine; and The conveying assembly 300 is rotatably disposed on the mounting seat 100 , and the conveying assembly 300 is used to convey the detection instrument 20 .

[0025] In the technical solution of the present invention, the inspection device 10 for in-cylinder viewing of a steam turbine includes a mounting seat 100, and a moving wheel group 200 is installed at the bottom of the mounting seat 100. The moving wheel group 200 is used to carry the mounting seat 100 to move in the steam turbine cylinder, and can be moved to a deeper position in the steam turbine cylinder. At least one conveying assembly 300 is arranged above the mounting seat 100, and the conveying assembly 300 is used to convey the detection instrument 20. Specifically, the inspection device 10 extends into the steam turbine cylinder, moves inwardly through the moving wheel group 200, and stops at a position where inspection is required, such as a turning position. Since there are places in the cylinder that are difficult for the mounting seat 100 to reach, the end of the clamped detection instrument 20 can be pushed forward by the conveying assembly 300, and the conveying assembly 300 It can be rotated relative to the mounting base 100, that is, the angle of the detection instrument 20 can be adjusted, so that the detection range of the detection instrument 20 can cover a wider range, obtain data from more viewing angles, and facilitate the detection of hard-to-reach areas, especially multiple bends and narrow gaps. Compared with the cylinder opening inspection, the present device can complete the inspection of the inside of the turbine without stopping or reducing the downtime, which greatly reduces the time required for operations such as cooling and cylinder opening construction, and can also avoid long-term shutdown maintenance and reduce maintenance costs. By precisely controlling the position and angle of the detection instrument 20, it can penetrate into areas that ordinary endoscopes cannot reach, and obtain more detailed and accurate internal conditions, thereby improving the flexibility of inspection and expanding the scope of application.

[0026] Specifically, the mounting seat 100 serves as a bearing body, and its shape can be a square structure or other irregular structures, and there is no restriction on its shape. Its material is preferably metal, which can withstand high temperature and is convenient for entering the turbine cylinder to withstand high temperature and work. The mounting seat 100 in this embodiment is a rectangular structure. The size of the mounting seat 100 can be selected to be 100 mm long, 80 mm wide, 100 mm high, and weigh less than 0.5 kg, and can be suitable for various conventional auxiliary pipes in the turbine cylinder; a receiving cavity is formed inside the mounting seat 100, and a driving structure is installed in the receiving cavity. A moving wheel group 200 is rotatably installed at the bottom of the mounting seat 100, and the driving structure is connected to the moving wheel group 200 to drive the moving wheel group 200 to rotate, that is, the mounting seat 100 is driven to move on the inner wall of the turbine cylinder by the driving structure and the moving wheel group 200, wherein the moving wheel group 200 drives the mounting seat 100 to move. The wheel assembly 200 includes at least one pair of movable wheels arranged on both sides of the mounting base 100. The movable wheels on both sides can be independently controlled, such as being driven by a motor respectively, and the motor is connected to the gear shaft through a gear box, or the movable wheels are connected through a belt / chain or the like. The connection method can adopt a common structure and is not limited to this. It should be noted that the movable wheels need to be resistant to high temperature, wear and corrosion, and can be made of polyurethane, ceramic composite materials or metal-based composite materials. At least one conveying assembly 300 is installed on the top of the mounting base 100. The conveying assembly 300 can be rotated relative to the mounting base 100 to adjust the angle of the detection instrument 20. The detection instrument 20 can also be pushed forward along the inside of the turbine according to the detection distance and position, and the angle can also be changed as needed, so that the detection instrument 20 can cover a wider range and obtain data from more perspectives.

[0027] See also Figure 1 and Figure 2 In an embodiment of the present invention, the detection instrument 20 is configured as an industrial endoscope, the industrial endoscope includes a data line 201 and a first camera 202 installed at the end of the data line 201, and the conveying component 300 includes: The housing 310 is rotatably mounted on the mounting base 100; The conveying wheel assembly 320 is rotatably mounted on the housing 310. The conveying wheel assembly 320 includes two conveying wheels 321, and the two conveying wheels 321 are arranged at an interval. The data line 201 is arranged in the interval between the two conveying wheels 321 and contacts the conveying wheels 321 on both sides. The conveying wheels 321 rotate to make the data line 201 be conveyed outward or retracted inward.

[0028] Specifically, please refer to Figure 1The housing 310 is used as the outer shell of the conveying assembly 300 for installing the conveying wheel set 320. The conveying wheel set 320 includes two conveying wheels 321 arranged at intervals. The interval between the two conveying wheels 321 forms a channel. The data line 201 of the industrial endoscope is inserted into the channel, and both sides of the data line 201 are in contact with the outer periphery of the conveying wheel 321, that is, there is friction between the data line 201 and the conveying wheel 321. As the conveying wheel 321 rotates, the data line 201 can be guided forward or backward to achieve effective pushing and retracting actions. When the conveying wheel 321 rotates in a specific direction, the friction between the conveying wheels 321 and the data line 201 will push the data line 201 to be conveyed outward because the conveying wheels 321 on both sides clamp the data line 201 in the middle. When the conveying wheel 321 rotates in the opposite direction, the data cable 201 will retract inward, and the position of the data cable 201 can be finely adjusted by controlling the rotation speed and direction of the conveying wheel 321; since the data cable 201 is clamped in the channel formed between the two conveying wheels 321, it can be ensured that the data cable 201 always maintains the correct path during the movement and will not be entangled, and since the shell 310 is rotatably connected to the mounting base 100, the angle of the first camera 202 at the end of the data cable 201 changes accordingly, not only can the data cable 201 be pushed in a straight line, but the angle of the first camera 202 can also be adjusted as needed, which is convenient for inspection at different angles, improves the flexibility and comprehensiveness of detection, and is suitable for environments with many bends or narrow gaps.

[0029] See also Figure 1 In an embodiment of the present invention, the conveying component 300 also includes a first rotating structure, which includes a first driving motor and a first rotating shaft 330. The first driving motor is arranged in the shell 310, and the output end is driven to connect to the first rotating shaft 330. The other end of the first rotating shaft 330 is connected to the conveying wheel 321. The first driving motor is installed inside the shell 310 as a power source. The output end is driven to connect to the conveying wheel 321 through the first rotating shaft 330. Specifically, the output end of the motor and the first rotating shaft 330 can be connected through a coupling or a keyway. The other end of the first rotating shaft 330 is fixedly connected to the conveying wheel 321. The power of the first driving motor is transmitted through the first rotating shaft 330, so that the conveying wheel 321 rotates, and the rotation of the conveying wheel 321 can drive the data line 201 to advance. Specifically, each conveying wheel 321 is connected through a first driving motor and a first rotating shaft 330 to realize the rotation of the conveying wheel 321.

[0030] See also Figure 1In another embodiment, at least two conveying wheel groups 320 are provided and arranged in parallel, that is, at least two conveying wheels 321 are arranged in parallel on each side of the data line 201, which enhances the support for the data line 201, avoids bending of the data line 201, and improves the stability during the pushing process. In addition, at least two conveying components 300 are provided and are arranged at intervals along the length direction of the data line 201. The data line 201 passes through the channel formed by each conveying component 300 in turn, which can better disperse the pressure on the data line 201, avoid damage caused by excessive force on a single point on the data line 201, and make the pushing of the data line 201 more stable, so that the data line 201 can be pushed to a place that is difficult to reach.

[0031] See also Figure 3 In one embodiment, the conveying assembly 300 also includes a second rotating structure, which includes a second driving motor and a second rotating shaft 340. The second driving motor is disposed in the mounting base 100, and the second driving motor drives the shell 310 to rotate through the second rotating shaft 340.

[0032] Specifically, the second drive motor is installed in the mounting base 100 as the power source of the conveying assembly 300. Specifically, a servo motor or a stepper motor can be used. The shell 310 is connected via the second rotating shaft 340. The second rotating shaft 340 transmits the power of the second drive motor to the shell 310 to drive the shell 310 to rotate, so that the shell 310 can rotate around the second rotating shaft 340, which is convenient for adjusting the angle of the first camera 202, driving the data line 201 to extend in different directions, expanding the inspection range, and improving the flexibility of inspection.

[0033] See also Figure 2 In an embodiment of the present invention, the conveying assembly 300 further includes an elastic member 350, which is disposed on a side of each conveying wheel 321 away from another conveying wheel 321, and has one end elastically connected to the conveying wheel 321 and the other end elastically connected to the shell 310. The elastic member 350 is compressed so that the conveying wheel 321 has a tendency to move toward the other conveying wheel 321.

[0034] Specifically, there is a conveying wheel 321 on both sides of the data line 201, and an elastic member 350 is arranged on the side of each conveying wheel 321 away from the other conveying wheel 321. One end of the elastic member 350 is connected to the housing 310, and the other end is connected to the first rotating shaft 330 for driving the conveying wheel 321 to rotate through a bearing (not shown). The elastic member 350 is in a compressed state. The elastic member 350 in the compressed state has a restoring force, so that the conveying wheel 321 has a tendency to move toward the other conveying wheel 321. That is, the arrangement of the elastic member 350 can make the two conveying wheels 321 have a tendency to move toward each other. The data lines 201 can be clamped in between by the elastic member 350 to prevent the data lines 201 from being separated during the rotation of the conveying wheel 321 and to avoid deviation from the predetermined path. In addition, the arrangement of the elastic member 350 enables the conveying assembly 300 to adapt to data lines 201 of different diameters. If the data line 201 is thicker, the elastic member 350 adjusts the compression amount to maintain an appropriate clamping force. If the data line 201 is thinner, the elastic member 350 reduces the compression amount, so that the outer wall of the conveying wheel 321 can always be closely attached to the surface of the data line 201, thereby preventing the data line 201 from bending and improving the stability of the advancement process.

[0035] See also Figure 1 In an embodiment of the present invention, the device 10 for internal viewing inspection of a steam turbine cylinder further includes a second camera 400 , which is mounted on the mounting base 100 .

[0036] Specifically, after the mounting base 100 enters the turbine cylinder, the second camera 400 can obtain the overall internal image information, and the driving structure drives the entire mounting base 100 to move forward along a predetermined path. The second camera 400 collects image data and transmits the image or video data to the control end. The control end controls the conveying component 300 at a specific position, and cooperates with the first rotating structure and the second rotating structure to push the industrial endoscope to the target position for detailed inspection, which helps to improve the inspection efficiency. Pre-detection and decision-making are carried out through the second camera 400 to reduce unnecessary movement.

[0037] In an embodiment of the present invention, the device 10 for in-cylinder inspection of a steam turbine also includes an adsorption assembly 600, which is mounted on the bottom of the mounting base 100. The adsorption assembly 600 is used to adsorb to the inner wall of the steam turbine to press the moving wheel assembly 200 against the inner wall of the steam turbine.

[0038] Specifically, the entire mounting base 100 can be adsorbed on the inner wall of the turbine cylinder through the adsorption assembly 600, so that the movable wheel group 200 is pressed against the inner wall of the turbine cylinder. That is, the setting of the adsorption device allows the inspection device 10 to remain stable on various multi-bend and inclined surfaces, reducing the risk of operational failure due to sliding or deviation from the path, and can ensure that the inspection device 10 hovers at various angles, facilitating high-precision detection, and also reducing the risk of accidental falling off or damage.

[0039] In one embodiment, the adsorption component 600 is configured as an electromagnetic coil, and the turbine cylinder internal viewing inspection device 10 further includes an electric control line 500, which is electrically connected to the electromagnetic coil.

[0040] Specifically, the adsorption component 600 is configured as an electromagnetic coil, which is connected to the electromagnetic coil through the electric control line 500 to power the electromagnetic coil so that the electromagnetic coil has a magnetic attraction. Since the turbine cylinder is a metal pipe wall, when the electromagnetic coil is energized, the magnetic attraction can make the device adsorbed in the turbine cylinder and closed, and the suction force allows the inspection device 10 to remain stable at various angles and inclined surfaces. Through the setting of the adsorption component 600, when the inspection device 10 reaches the area to be inspected, the inspection device 10 can be suspended in the area, and then the detection instrument 20 is further transported to the detection position through the conveying component 300 for detailed inspection. It should also be noted that in order to prevent the electric control line 500 from affecting the work in a high temperature environment, it is necessary to set a protective layer on the periphery of the electric control line 500, such as an asbestos protective layer and a stainless steel mesh protective layer. The asbestos protective layer and the stainless steel mesh protective layer can be arranged in sequence from the inside to the outside to improve the protection strength. To avoid the electric control line 500 being too heavy, the thickness of the protective layer is 0.5-1mm.

[0041] In other embodiments, the adsorption assembly 600 can also be configured for vacuum adsorption, such as a vacuum pump cooperates with a sealing ring and a suction cup to form vacuum adsorption, and the adsorption effect is achieved by forming a negative pressure through exhaustion so that the inspection device 10 is adsorbed on the inner wall of the turbine cylinder.

[0042] In one of the embodiments, when the inspection device is inverted and adsorbed on the inner wall of the turbine cylinder, the setting of the adsorption component 600 can prevent the mounting seat 100 from falling off. In order to prevent the data cable 201 of the industrial endoscope clamped by the conveying wheel 321 from falling off, a slide groove (not shown) can be provided on the outer periphery of the conveying wheel 321. The slide groove is provided along the circumference of the conveying wheel 321. It can be understood that the data cable 201 is clamped in the channel formed by the slide grooves of the conveying wheels 321 on both sides, and the data cable can be sent forward or withdrawn backward by the rotation of the conveying wheel 321. To detect different positions, the setting of the slide groove can better clamp the data line 201 and prevent it from falling off; or a connecting seat (not shown) is set on both sides of the top of the mounting seat 100, and the connection direction of the two connecting seats is the length direction of the data line 201. Each connecting seat is provided with a through hole, and the data line passes through one of the through holes, passes through the channel formed by the conveying wheel 321, and then passes through the other through hole. When the conveying wheel 321 rotates to convey the data line 201, the setting of the connecting seat and the through hole can also prevent the data line 201 from falling off.

[0043] See also Figure 3 In an embodiment of the present invention, a device 10 for in-cylinder inspection of a steam turbine includes a plurality of mounting seats 100, each mounting seat 100 is provided with at least one moving wheel assembly 200 and at least one conveying assembly 300, and the plurality of mounting seats 100 are arranged in series.

[0044] Specifically, multiple mounting seats 100 can act independently, and each mounting seat 100 acts as an independent working unit and enters the turbine cylinder through the moving wheel group 200. When reaching a corner, a bend or a place prone to problems, the adsorption component 600 is powered on and hovers at that position. The conveying component 300 on the mounting seat 100 conveys the detection instrument 20 to the detection position, and the remaining mounting seats 100 continue to move toward the inside of the turbine with the moving wheel group 200. When the first mounting seat 100 enters the innermost part, a full-scale inspection can be carried out, and the inspection data can be transmitted to the control end in real time to ensure that the entire inspection process is comprehensive, efficient and orderly. The adsorption component 600 can ensure that the mounting seat 100 will not slide or deviate from its position during the inspection. Multiple mounting seats 100 work together to complete a comprehensive inspection of the interior of the turbine in one operation, reducing the time cost of repeated entry and exit and improving inspection efficiency.

[0045] See also Figure 1 and Figure 3 In one embodiment, adjacent mounting seats 100 are connected in series via an electric control line 500 .

[0046] Specifically, a plug is provided at the end of the electric control line 500, and sockets 510 are provided at the head and tail sides of the mounting seat 100 respectively. By plugging the plug and the socket 510, power can be supplied to the driving structure, the electromagnetic coil, and the first rotating structure and the second rotating structure inside the mounting seat 100 for driving the moving wheel group 200 to move. In order to prevent the electric control line 500 from being disconnected from the mounting seat 100, a locking nut can be provided at the plug end of the electric control line 500, and a screw hole can be provided on the socket 510 of the mounting seat 100. By screwing the locking nut and the screw hole, it can be prevented from being disconnected inside the turbine. By connecting the electric control line 500 in series, power can be supplied to each structure in the mounting seat 100 on the one hand, and on the other hand, when some of the detected structures fail or malfunction, they can be dragged out to avoid being left inside. In accordance with the plug, an asbestos protective layer and a stainless steel mesh protective layer are also provided on the outer surface of the socket 510 to resist internal heat.

[0047] In an embodiment of the present invention, the device 10 for in-cylinder inspection of a steam turbine further includes a controller, which is disposed in the mounting seat 100 and is electrically connected to the electric control line 500, the electromagnetic coil, the conveying assembly 300 and the moving wheel assembly 200 respectively.

[0048] Specifically, a controller is set in each mounting seat 100, and the electric control line 500 supplies power to the controller. The controller receives electrical signals from the control end, the detection instrument 20 and the second camera 400 respectively, and controls whether the electromagnetic coil is energized according to the signal from the control end, thereby improving the intelligence of the entire inspection process, reducing human participation, and improving inspection efficiency. The present invention also proposes a method for inspecting the inside of a steam turbine cylinder. Figure 4 The inspection method is applied to the inspection device 10 of the above embodiment, and the specific structure of the inspection device 10 refers to the above embodiment.

[0049] The method for visual inspection of the steam turbine cylinder includes the following steps: S10, the driving structure drives the moving wheel set 200 to move, driving the mounting seat 100 to enter the steam turbine and move on the inner wall of the steam turbine, and the driving structure drives the moving wheel set 200 to stay at the desired detection location; S20 . Inside the steam turbine, the conveying assembly 300 conveys the detection instrument 20 to the area to be detected, and adjusts the angle of the detection instrument 20 by rotating the conveying assembly 300 .

[0050] Since the inspection method adopts the structure described in the above embodiment, it at least has all the beneficial effects brought by the technical solutions of the above embodiment. It should be noted that the inspection device 10 in the present application needs to enter the interior of the steam turbine through the high-pressure steam pipe, high-discharge pipe, exhaust pipe, and drain pipe when the steam turbine is in a shutdown state (it can be in a high-temperature and uncooled state), and move to the place where inspection is required, such as stopping at a bend for inspection, so as to achieve a deep inspection into the steam turbine cylinder without opening the cylinder, simplifying the inspection process. The driving structure drives the moving wheel group 200 to move, and drives the mounting seat 100 to move into the steam turbine to check the radial clearance of the flow, the integrity of the blades, etc., the detachment of components and foreign matter, etc., wherein the detection instrument 20 can use an industrial endoscope, and the data cable 201 of the industrial endoscope 20 is clamped by the conveying component 300, so as to clamp the data cable 201 and convey it forward to the place that is difficult for the mounting seat 100 to reach, so that the first camera 202 of the industrial endoscope 20 detects the place that is difficult for the mounting seat 100 to reach.

[0051] In one embodiment, in the step of driving the moving wheel group 200 to move, a plurality of mounting seats 100 are connected in series via an electric control line 500, and each mounting seat 100 stays at a detection position, and the remaining mounting seats 100 are driven by the driving structure to enter the interior of the steam turbine until the first mounting seat 100 reaches the deepest part of the inner wall of the steam turbine.

[0052] Among them, multiple mounting seats 100 can act independently, and each mounting seat 100 acts as an independent working unit, entering the turbine cylinder through the moving wheel group 200. When reaching a corner, a bend or a place prone to problems, the adsorption component 600 is powered on and hovers at this position. The conveying component 300 on the mounting seat 100 conveys the detection instrument 20 to the detection position, and the remaining mounting seats 100 continue to move toward the inside of the turbine with the moving wheel group 200. When the first mounting seat 100 enters the innermost part, a full-scale inspection can be carried out, and the inspection data can be transmitted to the control end in real time to ensure that the entire inspection process is comprehensive, efficient and orderly. The adsorption component 600 can ensure that the mounting seat 100 will not slide or deviate from its position during the inspection. Multiple mounting seats 100 work together to complete a comprehensive inspection of the interior of the turbine in one operation, reducing the time cost of repeated entry and exit and improving inspection efficiency.

[0053] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A device for inspecting the inside of a steam turbine cylinder, characterized in that: include: Mounting seat; A driving structure, disposed on the mounting seat; A moving wheel set is arranged at the bottom of the mounting seat, and the driving structure is drivingly connected to the moving wheel set to drive the moving wheel set to drive the mounting seat to move on the inner wall of the steam turbine; as well as A conveying assembly is rotatably arranged on the mounting seat, and the conveying assembly is used for conveying the detection instrument.

2. The device for inspecting the inside of a steam turbine cylinder according to claim 1, characterized in that: The detection instrument is configured as an industrial endoscope, the industrial endoscope includes a data line and a first camera installed at the end of the data line, and the conveying component includes: A housing, rotatably mounted on the mounting seat; A conveying wheel assembly is rotatably mounted on the shell, the conveying wheel assembly includes two conveying wheels, and the two conveying wheels are arranged at an interval. The data line is arranged in the interval between the two conveying wheels and contacts the conveying wheels on both sides. The conveying wheels rotate to make the data line be conveyed outward or retracted inward.

3. The device for inspecting the inside of a steam turbine cylinder according to claim 2, characterized in that: The conveying assembly further includes a first rotating structure, which includes a first driving motor and a first rotating shaft. The first driving motor is disposed in the housing, and an output end of the first driving motor is connected to the first rotating shaft, and the other end of the first rotating shaft is connected to the conveying wheel. And / or, each of the conveying wheel groups is provided with at least two and arranged in parallel; And / or, the conveying assembly further includes a second rotating structure, the second rotating structure includes a second driving motor and a second rotating shaft, the second driving motor is disposed in the mounting seat, and the second driving motor drives the shell to rotate via the second rotating shaft.

4. The device for inspecting the inside of a steam turbine cylinder according to any one of claims 2 to 3, characterized in that: The conveying assembly also includes an elastic member, which is arranged on a side of each conveying wheel away from the other conveying wheel, and one end of the elastic member is elastically connected to the conveying wheel, and the other end is elastically connected to the shell. The elastic member is compressed so that the conveying wheel has a tendency to move toward the other conveying wheel.

5. The device for inspecting the inside of a steam turbine cylinder according to claim 1, characterized in that: The device for peek inspection in a steam turbine cylinder also includes a second camera, which is mounted on the mounting seat.

6. The device for inspecting the inside of a steam turbine cylinder according to claim 1, characterized in that: The device for peep inspection in the steam turbine cylinder further comprises an adsorption assembly, which is mounted on the bottom of the mounting seat and is used to be adsorbed on the inner wall of the steam turbine to press the moving wheel assembly against the inner wall of the steam turbine; Wherein, the adsorption component is configured as an electromagnetic coil, and the device for internal viewing inspection of a steam turbine cylinder further includes an electric control line, which is electrically connected to the electromagnetic coil.

7. The device for inspecting the inside of a steam turbine cylinder according to claim 6, characterized in that: The device for peek inspection in a steam turbine cylinder comprises a plurality of mounting seats, each of which is provided with at least one movable wheel set and at least one conveying assembly, and the plurality of mounting seats are arranged in series; adjacent mounting seats are connected in series via the electric control line.

8. The device for inspecting the inside of a steam turbine cylinder according to claim 7, characterized in that: The device for peek inspection in the steam turbine cylinder also includes a controller, which is arranged in the mounting seat and is electrically connected to the electric control line, the electromagnetic coil, the conveying assembly and the moving wheel group respectively.

9. A method for inspecting the inside of a steam turbine cylinder, characterized in that: Using the inspection device according to any one of claims 1 to 8, the inspection method comprises: The driving structure drives the moving wheel group to move, drives the mounting seat to enter the steam turbine, and moves on the inner wall of the steam turbine. The driving structure drives the moving wheel group to stay at the required detection position; In the steam turbine, the conveying assembly conveys the detection instrument to the area to be detected, and adjusts the angle of the detection instrument by rotating the conveying assembly.

10. The method for inspecting the inside of a steam turbine cylinder according to claim 9, characterized in that: In the step of the driving structure driving the moving wheel group to move: multiple mounting seats are connected in series through electric control lines, and each mounting seat stays at a detection position, and the remaining mounting seats are driven into the interior of the turbine by the driving structure until the first mounting seat reaches the deepest part of the inner wall of the turbine.

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