Device and method for judging boiler heating surface state based on concave-convex quantity

Abstract

The present invention relates to the technical field of heating surface state detection, and in particular to a device and method for judging the state of a boiler heating surface based on the amount of concave and convex. The device for judging the state of a boiler heating surface based on the amount of concave and convex comprises a bottom ring, the inner side of the bottom ring is rotatably connected to a swivel, the top of the swivel is fixedly connected to two symmetrical vertical poles, the outer side of the vertical pole is slidably connected to a connecting ring and an accompanying pressure block, a first spring is fixedly connected between the accompanying pressure block and the connecting ring, the distance fluctuation L1 between the accompanying pressure block and the connecting ring can be obtained by the compression degree of the first spring or a rangefinder, and an extension rod is fixedly connected to the inner side of the connecting ring. The present invention can effectively make the detection component move following the spiral distribution of the spiral fin, realize the concave and convex detection of the entire spiral fin, thereby obtaining the corrosion and rust state of the spiral fin, estimating the flue gas resistance at the tail of the waste heat boiler, and providing data support for timely maintenance.

Description

Technical Field

[0001] The present invention relates to the technical field of heating surface state detection, and in particular to a device and method for judging the state of a boiler heating surface based on concave-convex quantities. Background Art

[0002] When a gas turbine is equipped with a waste heat boiler, the back pressure increases, which inevitably causes the gas turbine power to decrease. The size of the flue gas resistance restricts the size of the boiler and its economy.

[0003] The heating surface is composed of rows and groups of pipes. When the flue gas passes through, it exchanges heat with the water in the pipe for heat utilization. However, during the shutdown period of the gas waste heat boiler, the heating surface on the flue gas side often corrodes and condenses, causing rust and accumulation, resulting in increased flue resistance during operation.

[0004] Especially at the end of the boiler flue, the flue gas heat is at a low level. In order to make full use of the flue gas energy, spiral fins 1a are added to the outside of the tube 1 to increase the heat exchange area. When the spiral fins 1a are slagging, rusting and corroded, the heat exchange area and turbulence are further increased, greatly increasing the back pressure of the gas turbine. Therefore, it is very necessary to detect the concave and convex amount of the spiral fins 1a when the shutdown is about to end.

[0005] Therefore, in order to solve the above problems, a device and method for judging the state of the heating surface of a boiler based on the amount of concave and convex are proposed. Summary of the Invention

[0006] The purpose of the present invention is to provide a device and method for judging the state of the boiler heating surface based on the concave-convex amount, which can effectively obtain the concave-convex fluctuations on both sides of the spiral fin, thereby effectively detecting the state of the heating surface where the spiral fin tube is located.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a device for judging the state of a boiler heating surface based on the amount of concavity and convexity, comprising a bottom ring, the inner side of which is rotatably connected to a swivel, the top of which is fixedly connected to two symmetrical vertical rods, the outer sides of which are slidably connected to a connecting ring and an accompanying pressure block, a first spring fixedly connected between the accompanying pressure block and the connecting ring, and a distance fluctuation L1 between the accompanying pressure block and the connecting ring that can be obtained by the compression degree of the first spring or a distance meter;

[0008] An extension rod is fixedly connected to the inner side of the connecting ring. The extension rod can be placed on the spiral fin. When the connecting ring rotates, the extension rod drives the connecting ring to rise along the spiral fin. The rotating ring and the accompanying pressure block can move simultaneously. For each rotation of the rotating ring, the accompanying pressure block rises by one pitch of the spiral fin.

[0009] A detection box is fixedly connected to the side of the connecting ring corresponding to the extension rod, and two limit rods are fixedly connected to the inside of the detection box. The outer side of the limit rod is slidably connected to the upper probe rod and the lower probe rod. A third spring is fixedly connected between the inner side of the detection box and one end of the upper probe rod or the lower probe rod. The upper probe rod and the lower probe rod are in contact with the upper and lower surfaces of the spiral fin respectively. A potentiometer is fixedly connected to one of the limit rods, which is used to obtain the position changes of the upper probe rod and the lower probe rod on the limit rod.

[0010] The present invention can effectively make the detection component move along with the spiral distribution of the spiral fins, realize the detection of the concave and convex amount of the entire spiral fin, thereby obtaining the corrosion and rust status of the spiral fins, estimating the flue gas resistance at the tail of the waste heat boiler, and providing data support for timely maintenance. By obtaining the concave and convex fluctuations on both sides of the spiral fins, the present invention can effectively detect the state of the heating surface where the spiral fin tube is located;

[0011] The present invention uses an upper probe rod and a lower probe rod to contact the upper and lower surfaces of the spiral fin respectively. A third spring is used to keep the upper and lower probe rods in close contact with the surface of the spiral fin. When the detection box rotates and rises around the spiral fin, due to the presence of unevenness on the surface of the spiral fin, the upper and lower probe rods will show position changes on the limit rod that reflect the unevenness of the spiral fin. The change in unevenness directly reflects the roughness and corrosion degree of the spiral fin, thereby estimating the resistance of the tail flue gas and the back pressure of the gas turbine.

[0012] The first spring is used to achieve close contact between the extension rod and the spiral fin, thereby increasing the stability of the movement of the extension rod on the spiral fin;

[0013] As a device for judging the state of the boiler heating surface based on the amount of convexity and concaveness of the present invention, preferably, a slider is fixedly connected to the middle position of the upper probe rod and the lower probe rod, and the slider slides on the potentiometer. The position change of the upper probe rod and the lower probe rod on the limit rod is obtained by obtaining the position of the slider on the potentiometer.

[0014] As a preferred device for judging the state of the boiler heating surface based on the amount of concave and convex of the present invention, the bottom ring, the rotating ring and the connecting ring are all composed of two parts that are symmetrical on the left and right. The two parts realize a detachable closed loop through a card slot and a connecting card rod. The card slot and the connecting card rod are fasteners, which belong to the existing technology and will not be elaborated here.

[0015] The bottom ring, swivel ring and connecting ring are detachable through the slots and connecting rods in order to enable the device to be installed outside the spiral fins;

[0016] As a device for judging the state of the boiler heating surface based on the amount of convexity and concaveness of the present invention, preferably, the bottom end of the rotating ring is in the shape of a gear ring, the outer side of the bottom ring is fixedly connected to the first motor, the end of the main shaft of the first motor is fixedly connected to a gear, the gear is engaged with the gear ring area at the bottom end of the rotating ring, and the rotation of the rotating ring is realized by the rotation of the first motor.

[0017] As a device for judging the state of the boiler heating surface based on the concave-convex amount of the present invention, preferably, the bottom end of the accompanying pressure block is fixedly connected to an annular pressure sensor, the pressure sensor is in conflict with one end of the first spring, and the elastic force change of the first spring is obtained by the pressure sensor to obtain the compression degree of the first spring, and the distance fluctuation L1 between the accompanying pressure block and the connecting ring is obtained;

[0018] Because the spiral fin surface has unevenness, when the extension rod passes through the convex surface, the extension rod rises and the distance between the accompanying pressure block and the connecting ring shortens. At this time, L1 is recorded as a positive value, and the detection box will also rise synchronously accordingly. In order to obtain the actual unevenness of the detection position of the upper and lower probe rods, it is necessary to compensate according to the distance fluctuation L1 between the accompanying pressure block and the connecting ring;

[0019] The specific compensation method is as follows: when the extension rod passes through the convex surface, the extension rod rises, L1 is counted as a positive value, the detection box rises, and the upper probe rod is pressed downward by the action of the third spring. The actual position of the upper probe rod plus the distance change of L1 is the actual displacement change of the probe rod on the spiral fin; at the same time, the lower probe rod is squeezed, which compresses the third spring and also moves downward. The actual position of the lower probe rod plus the distance change of L1 is the actual displacement change of the lower probe rod on the spiral fin;

[0020] When the extension rod passes through the concave surface, the distance between the accompanying pressure block and the connecting ring increases, the extension rod drops, L1 is measured as a negative value, the detection box drops, and the upper probe rod is squeezed, which compresses the third spring to move upward. The displacement change value of the upper probe rod plus the distance change value of L1 is the actual displacement change of the upper probe rod on the spiral fin; the lower probe rod is pressed upward under the action of the third spring, and the displacement change value of the lower probe rod plus the distance change value of L1 is the actual displacement change of the lower probe rod on the spiral fin;

[0021] As the device for judging the state of the boiler heating surface based on the concave-convex amount of the present invention, preferably, the rangefinder is a telescopic measuring rod.

[0022] As a preferred device for judging the state of the boiler heating surface based on the amount of convexity and concaveness of the present invention, the inner side of the accompanying pressure block is rotatably connected to a driving wheel, and the driving wheel is tightly fitted with the outer side of the vertical pole. The outer sides of the left and right ends of the accompanying pressure block are fixedly connected to self-locking motors, and the main shaft end of the self-locking motor is fixedly connected to the driving wheel. The sliding of the accompanying pressure block on the vertical pole is achieved by the rotation of the self-locking motor.

[0023] As a preferred device for judging the state of the boiler heating surface based on the amount of convexity and concaveness of the present invention, the downward projection of the extension rod overlaps with one of the diameters of the rotating ring, the inner side of the extension rod is slidably connected to the inner rod, and a second spring is provided on the inner side of the extension rod. The two ends of the second spring are respectively fixedly connected to one end of the inner rod and the inner side of one end of the extension rod, the end of the inner rod can contact the outside of the pipe, the end of the extension rod is fixedly connected to a displacement sensor, and the detection end of the displacement sensor is connected to the inner rod.

[0024] As a device for judging the state of the boiler heating surface based on the amount of convexity and concaveness of the present invention, preferably, the outer side of the extension rod is rotatably connected to the second roller, and the outer sides of the upper probe rod and the lower probe rod are rotatably connected to the first roller, and the first roller and the second roller are used to reduce friction during movement.

[0025] The method for judging the state of the boiler heating surface based on the concave-convex amount comprises the following steps:

[0026] Step 1: Installation: Put the detachable bottom ring, swivel and connecting ring on the outside of the spiral fin. The bottom ring is a flat support. The extension rod is placed on the spiral fin. The upper and lower probe rods are placed on the upper and lower sides of the spiral fin respectively.

[0027] Step 2: Align the bottom ring. Rotate the swivel. During the rotation, observe the expansion and contraction of the displacement sensor. Then align the bottom ring according to the position and expansion of the displacement sensor. After the swivel rotates one circle, the displacement sensor does not change its value, indicating that the pipe is in the center of the bottom ring.

[0028] Step 3: Initialization, select a flat position on the spiral fin surface, and place the extension rod, upper probe rod, and lower probe rod on the flat surface. If they cannot be in the flat position at the same time, the corresponding position of the spiral fin needs to be polished or repaired. The swivel continues to rotate, and the detection box will spiral up along the spiral fin;

[0029] Step 4: Data acquisition: Due to the presence of unevenness on the surface of the spiral fin, when the extension rod passes through the unevenness on the surface of the spiral fin, the connecting ring cannot move evenly when it rises. During the spiral rise of the detection box, the actual unevenness on the surface of the spiral fin is the displacement change of the upper probe rod and the lower probe rod minus or plus the distance fluctuation L1 of the extension rod.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. The device for judging the state of the boiler heating surface based on the concave-convex amount can effectively make the detection component move along the spiral distribution of the spiral fins, realize the concave-convex amount detection of the entire spiral fin, thereby obtaining the corrosion and rust state of the spiral fins, estimating the flue gas resistance at the tail of the waste heat boiler, and providing data support for timely maintenance. By obtaining the concave-convex fluctuations on both sides of the spiral fins, the present invention can effectively detect the state of the heating surface where the spiral fin tube is located.

[0032] 2. The device for judging the state of the boiler heating surface based on the amount of concave and convex, the present invention contacts the upper and lower surfaces of the spiral fin respectively through the upper probe rod and the lower probe rod, and the third spring is used to make the upper probe rod and the lower probe rod tightly adhere to the surface of the spiral fin. In the process of the detection box rotating and rising around the spiral fin, due to the existence of the concave and convex on the surface of the spiral fin, the upper probe rod and the lower probe rod will appear on the limit rod. The position change of the spiral fin concave and convex amount will directly reflect the roughness and corrosion degree of the spiral fin, thereby estimating the resistance of the tail flue gas and the back pressure of the gas turbine.

[0033] 3. This device for judging the state of the boiler heating surface based on the amount of concave and convex has concave and convex amounts on the surface of the spiral fins. When the extension rod passes through the convex surface, the extension rod rises and the distance between the accompanying pressure block and the connecting ring is shortened. At this time, L1 is recorded as a positive value, and the detection box will also rise synchronously accordingly. In order to obtain the actual concave and convex amounts of the detection positions of the upper and lower probe rods, it is necessary to compensate according to the distance fluctuation L1 between the accompanying pressure block and the connecting ring.

[0034] 4. The device for judging the state of the boiler heating surface based on the concave and convex amount has a specific compensation method as follows: when the extension rod passes through the convex surface, the extension rod rises, L1 is measured as a positive value, the detection box rises, and the upper probe rod is pressed downward under the action of the third spring, and the actual position of the upper probe rod plus the distance change of L1 is the actual displacement change of the probe rod on the spiral fin; at the same time, the lower probe rod is squeezed and the third spring is compressed to move downward as well, and the actual position of the lower probe rod plus the distance change of L1 is the actual displacement change of the lower probe rod on the spiral fin. When the extension rod passes through the concave surface, the distance between the accompanying pressure block and the connecting ring increases, the extension rod drops, L1 is measured as a negative value, the detection box drops, and the upper probe rod is squeezed and the third spring is compressed to move upward, and the displacement change value of the upper probe rod plus the distance change value of L1 is the actual displacement change of the upper probe rod on the spiral fin; the lower probe rod is pressed upward under the action of the third spring, and the displacement change value of the lower probe rod plus the distance change value of L1 is the actual displacement change of the lower probe rod on the spiral fin. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 Schematic diagram of the spiral fin of the present invention being corroded and slagging to cause thickening or thinning;

[0036] Figure 2This is a schematic diagram of the overall appearance structure of the present invention;

[0037] Figure 3 This is a schematic diagram of the overall cross-sectional structure of the present invention when in use;

[0038] Figure 4 This is a schematic diagram of the appearance structure of the connecting ring, connecting clamping rod and clamping slot of the present invention;

[0039] Figure 5 This is a structural schematic diagram of the installation position of the extension rod on the connecting ring of the present invention;

[0040] Figure 6 Schematic diagram of the internal structure of the extension rod of the present invention;

[0041] Figure 7 This is a schematic diagram of the internal cross-sectional structure of the detection box of the present invention;

[0042] Figure 8 For the present invention Figure 7 A in the figure shows the enlarged structural diagram;

[0043] Figure 9 This is a schematic diagram of the internal structure of the accompanying pressing block of the present invention;

[0044] Figure 10 Schematic diagram of the distance fluctuation L1 between the accompanying pressing block and the connecting ring caused by the extension rod rising or falling according to the present invention.

[0045] In the figure: 1, tube; 1a, spiral fin; 1b, concave surface; 1c, convex surface;

[0046] 2. Bottom ring; 3. Swivel; 4. Detection box; 5. Traveling pressure block; 6. First spring; 7. Connecting ring; 8. Vertical pole; 9. First motor; 10. Extension rod; 11. Gear; 13. Slot; 14. Connecting rod;

[0047] 41. Lower probe rod; 42. Upper probe rod; 43. First roller; 44. Limit rod; 45. Potentiometer; 46. Slider; 47. Third spring;

[0048] 51. Driving wheel; 52. Pressure sensor; 53. Self-locking motor;

[0049] 101. Displacement sensor; 102. Inner rod; 103. Second roller; 104. Second spring. DETAILED DESCRIPTION

[0050] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0051] Example 1, please refer to Figures 1-4 , Figure 6-Figure 9 The present invention provides a technical solution: a device and method for judging the state of a boiler heating surface based on the amount of concave-convex. The device for judging the state of a boiler heating surface based on the amount of concave-convex comprises a bottom ring 2, the inner side of the bottom ring 2 is rotatably connected to a swivel 3, the top of the swivel 3 is fixedly connected to two symmetrical vertical rods 8, the outer side of the vertical rods 8 is slidably connected to a connecting ring 7 and an accompanying pressure block 5, a first spring 6 is fixedly connected between the accompanying pressure block 5 and the connecting ring 7, and the distance fluctuation L1 between the accompanying pressure block 5 and the connecting ring 7 can be obtained by the compression degree of the first spring 6 or a distance meter;

[0052] An extension rod 10 is fixedly connected to the inner side of the connecting ring 7. The extension rod 10 can be placed on the spiral fin 1a. When the connecting ring 7 rotates, the extension rod 10 drives the connecting ring 7 to rise along the spiral fin 1a. The swivel 3 and the accompanying pressure block 5 can move simultaneously. For each rotation of the swivel 3, the accompanying pressure block 5 rises by one pitch of the spiral fin 1a.

[0053] A detection box 4 is fixedly connected to the side of the connecting ring 7 corresponding to the extension rod 10, and two limit rods 44 are fixedly connected to the inside of the detection box 4. The outer side of the limit rod 44 is slidably connected to the upper probe rod 42 and the lower probe rod 41. A third spring 47 is fixedly connected between the inner side of the detection box 4 and one end of the upper probe rod 42 or the lower probe rod 41. The upper probe rod 42 and the lower probe rod 41 are in contact with the upper and lower surfaces of the spiral fin 1a respectively. A potentiometer 45 is fixedly connected to one of the limit rods 44, which is used to obtain the position changes of the upper probe rod 42 and the lower probe rod 41 on the limit rod 44.

[0054] The present invention can effectively make the detection component move along with the spiral distribution of the spiral fin 1a, realize the detection of the concave and convex amount of the entire spiral fin 1a, thereby obtaining the corrosion and rust status of the spiral fin 1a, estimating the flue gas resistance at the tail of the waste heat boiler, and providing data support for timely maintenance. By obtaining the concave and convex fluctuations on both sides of the spiral fin 1a, the present invention can effectively detect the state of the heating surface where the spiral fin tube is located;

[0055] The present invention uses an upper probe rod 42 and a lower probe rod 41 to contact the upper and lower surfaces of the spiral fin 1a respectively. A third spring 47 is used to keep the upper probe rod 42 and the lower probe rod 41 in close contact with the surface of the spiral fin 1a. As the detection box 4 rotates and rises around the spiral fin 1a, due to the presence of unevenness on the surface of the spiral fin 1a, the upper probe rod 42 and the lower probe rod 41 will appear on the limit rod 44. The position change reflects the unevenness of the spiral fin 1a. The change in the unevenness directly reflects the roughness and corrosion degree of the spiral fin 1a, thereby estimating the tail flue gas resistance and the back pressure of the gas turbine.

[0056] The first spring 6 is used to achieve close contact between the extension rod 10 and the spiral fin 1a, thereby increasing the stability of the movement of the extension rod 10 on the spiral fin 1a;

[0057] Specifically, a slider 46 is fixedly connected to the middle position of the upper probe rod 42 and the lower probe rod 41. The slider 46 slides on the potentiometer 45. The position change of the upper probe rod 42 and the lower probe rod 41 on the limit rod 44 is obtained by obtaining the position of the slider 46 on the potentiometer 45.

[0058] Specifically, the bottom ring 2 , the rotating ring 3 and the connecting ring 7 are composed of two parts that are bilaterally symmetrical, and the two parts realize a detachable closed loop through the clamping groove 13 and the connecting clamping rod 14 .

[0059] The bottom ring 2, the rotating ring 3 and the connecting ring 7 are detachable through the slot 13 and the connecting rod 14 in order to realize the installation of the device outside the spiral fin 1a;

[0060] Specifically, the bottom end of the rotating ring 3 is in the shape of a gear ring, and the outer side of the bottom ring 2 is fixedly connected to the first motor 9. The end of the main shaft of the first motor 9 is fixedly connected to the gear 11. The gear 11 is engaged with the gear ring area at the bottom end of the rotating ring 3, and the rotation of the rotating ring 3 is realized by the rotation of the first motor 9.

[0061] Specifically, an annular pressure sensor 52 is fixedly connected to the bottom end of the accompanying pressure block 5. The pressure sensor 52 contacts one end of the first spring 6. The pressure sensor 52 obtains the elastic force change of the first spring 6 and thus the compression degree of the first spring 6, thereby obtaining the distance fluctuation L1 between the accompanying pressure block 5 and the connecting ring 7.

[0062] Because the surface of the spiral fin 1a has unevenness, when the extension rod 10 passes through the convex surface, the extension rod 10 rises, and the distance between the accompanying pressure block 5 and the connecting ring 7 is shortened. At this time, L1 is recorded as a positive value, and the detection box 4 will also rise synchronously accordingly. In order to obtain the actual unevenness of the detection position of the upper probe rod 42 and the lower probe rod 41, it is necessary to compensate according to the distance fluctuation L1 between the accompanying pressure block 5 and the connecting ring 7;

[0063] The specific compensation method is as follows: when the extension rod 10 passes through the convex surface, the extension rod 10 rises, L1 is counted as a positive value, and the upper probe rod 42 is pressed downward by the action of the third spring 47. The actual position of the upper probe rod 42 plus the distance change of L1 is the actual displacement change of the upper probe rod 42 on the spiral fin 1a; at the same time, the lower probe rod 41 is squeezed, which compresses the third spring 47 and also moves downward. The actual position of the lower probe rod 41 plus the distance change of L1 is the actual displacement change of the lower probe rod 41 on the spiral fin 1a.

[0064] When the extension rod 10 passes through the concave surface, the distance between the accompanying pressure block 5 and the connecting ring 7 increases, the extension rod 10 drops, L1 is counted as a negative value, the detection box 4 drops, L1 is a negative value, and the displacement change value of the upper probe rod 42 plus the distance change value of L1 is the actual displacement change of the upper probe rod 42 on the spiral fin 1a; the lower probe rod will be pressed upward under the action of the third spring 47, and the displacement change value of the lower probe rod 41 plus the distance change value of L1 is the actual displacement change of the lower probe rod 41 on the spiral fin 1a;

[0065] Specifically, the rangefinder is a telescopic measuring rod, the two ends of which are fixedly connected to the bottom end of the accompanying pressing block 5 and the top end of the connecting ring 7 .

[0066] Specifically, the inner side of the accompanying pressure block 5 is rotatably connected to the driving wheel 51, and the driving wheel 51 is tightly fitted with the outer side of the vertical pole 8. The outer sides of the left and right ends of the accompanying pressure block 5 are fixedly connected to the self-locking motor 53, and the main shaft end of the self-locking motor 53 is fixedly connected to the driving wheel 51. The sliding of the accompanying pressure block 5 on the vertical pole 8 is achieved by the rotation of the self-locking motor 53.

[0067] By rotating the self-locking motor 53, the rotating ring 3 rotates one circle, and the accompanying pressing block 5 rises by the pitch of the spiral fin 1a;

[0068] Example 2, please refer to Figure 1-9 , the parts of this embodiment that are the same as those in Example 1 are not repeated here, the difference is that: the downward projection of the extension rod 10 overlaps with one of the diameters of the swivel 3, the inner side of the extension rod 10 is slidably connected to the inner rod 102, and a second spring 104 is provided on the inner side of the extension rod 10. The two ends of the second spring 104 are respectively fixedly connected to one end of the inner rod 102 and the inner side of one end of the extension rod 10, the end of the inner rod 102 can contact the outside of the tube 1, the end of the extension rod 10 is fixedly connected to the displacement sensor 101, and the detection end of the displacement sensor 101 is connected to the inner rod 102.

[0069] Specifically, the outer side of the extension rod 10 is rotatably connected to the second roller 103, and the outer sides of the upper probe rod 42 and the lower probe rod 41 are rotatably connected to the first roller 43. The first roller 43 and the second roller 103 are used to reduce friction during movement.

[0070] The present invention also discloses a method for judging the state of a boiler heating surface based on the concave-convex amount, the method comprising the following steps:

[0071] Step 1: Installation: Put the detachable bottom ring 2, swivel ring 3 and connecting ring 7 on the outside of the spiral fin 1a. The bottom ring 2 is a flat support. The extension rod 10 is placed on the spiral fin 1a. The upper probe rod 42 and the lower probe rod 41 are placed on the upper and lower sides of the spiral fin 1a respectively.

[0072] Step 2: Align the bottom ring 2 and rotate the swivel 3. During the rotation, observe the expansion and contraction of the displacement sensor 101. Then, align the bottom ring 2 according to the position and expansion of the displacement sensor 101. After the swivel 3 rotates one circle, the displacement sensor 101 does not show any value change, indicating that the pipe 1 is at the center of the bottom ring 2.

[0073] Step 3: Initialization, select a flat position on the surface of the spiral fin 1a, and place the extension rod 10, the upper probe rod 42, and the lower probe rod 41 on the flat position. If they cannot be in the flat position at the same time, the corresponding position of the spiral fin 1a needs to be polished or repaired. The swivel 3 continues to rotate, and the detection box 4 will spiral up along the spiral fin 1a;

[0074] Step 4: Data acquisition: Due to the unevenness of the surface of the spiral fin 1a, when the extension rod 10 passes through the unevenness of the surface of the spiral fin 1a, the connecting ring 7 cannot move evenly when it rises. During the spiral rise of the detection box 4, the actual unevenness of the surface of the spiral fin 1a is the displacement change of the upper probe rod 42 and the lower probe rod 41 minus or plus the distance fluctuation L1 of the extension rod 10.

[0075] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A device for judging the state of a boiler heating surface based on the amount of concavity and convexity, comprising a bottom ring (2), characterized in that: The inner side of the bottom ring (2) is rotatably connected to a rotating ring (3), the top of the rotating ring (3) is fixedly connected to two symmetrical vertical poles (8), the outer side of the vertical pole (8) is slidably connected to a connecting ring (7) and an accompanying pressure block (5), a first spring (6) is fixedly connected between the accompanying pressure block (5) and the connecting ring (7), and the distance fluctuation L1 between the accompanying pressure block (5) and the connecting ring (7) can be obtained by the compression degree of the first spring (6) or a distance meter; An extension rod (10) is fixedly connected to the inner side of the connecting ring (7), and the extension rod (10) can be placed on the spiral fin (1a). When the connecting ring (7) rotates, the extension rod (10) drives the connecting ring (7) to rise along the spiral fin (1a), and the rotating ring (3) and the accompanying pressure block (5) can move simultaneously. Every time the rotating ring (3) rotates one circle, the accompanying pressure block (5) rises by a pitch of the spiral fin (1a); A detection box (4) is fixedly connected to one side of the connecting ring (7) corresponding to the extension rod (10), two limit rods (44) are fixedly connected inside the detection box (4), an upper probe rod (42) and a lower probe rod (41) are slidably connected to the outer side of the limit rod (44), a third spring (47) is fixedly connected between the inner side of the detection box (4) and one end of the upper probe rod (42) or the lower probe rod (41), the upper probe rod (42) and the lower probe rod (41) are in contact with the upper and lower surfaces of the spiral fin (1a) respectively, and a potentiometer (45) is fixedly connected to one of the limit rods (44) for obtaining position changes of the upper probe rod (42) and the lower probe rod (41) on the limit rod (44); The middle positions of the upper probe rod (42) and the lower probe rod (41) are fixedly connected with a slider (46), and the slider (46) slides on the potentiometer (45). By obtaining the position of the slider (46) on the potentiometer (45), the position change of the upper probe rod (42) and the lower probe rod (41) on the limit rod (44) is obtained; The bottom end of the accompanying pressure block (5) is fixedly connected to a ring-shaped pressure sensor (52), and the pressure sensor (52) is in conflict with one end of the first spring (6). The compression degree of the first spring (6) is obtained through the pressure sensor (52), thereby obtaining the distance fluctuation L1 between the accompanying pressure block (5) and the connecting ring (7). The inner side of the accompanying pressure block (5) is rotatably connected to a driving wheel (51), and the driving wheel (51) is tightly fitted with the outer side of the vertical pole (8). The outer sides of the left and right ends of the accompanying pressure block (5) are fixedly connected to self-locking motors (53), and the main shaft end of the self-locking motor (53) is fixedly connected to the driving wheel (51). The sliding of the accompanying pressure block (5) on the vertical pole (8) is achieved by the rotation of the self-locking motor (53).

2. The device for judging the state of a boiler heating surface based on the concave-convex amount according to claim 1, characterized in that: The bottom ring (2), the rotating ring (3) and the connecting ring (7) are composed of two parts that are symmetrical on both sides. The two parts realize a detachable closed loop through the clamping groove (13) and the connecting clamping rod (14).

3. The device for judging the state of a boiler heating surface based on the concave-convex amount according to claim 1, characterized in that: The bottom end of the rotating ring (3) is in the shape of a toothed ring. The outer side of the bottom ring (2) is fixedly connected to a first motor (9). The end of the main shaft of the first motor (9) is fixedly connected to a gear (11). The gear (11) is engaged with the toothed ring area at the bottom end of the rotating ring (3). The rotation of the rotating ring (3) is achieved by the rotation of the first motor (9).

4. The device for judging the state of a boiler heating surface based on the concave-convex amount according to claim 1, characterized in that: The rangefinder is a telescopic measuring rod.

5. The device for judging the state of a boiler heating surface based on the concave-convex amount according to claim 1 or 2, characterized in that: The downward projection of the extension rod (10) overlaps with one diameter of the rotating ring (3) above and below. The inner side of the extension rod (10) is slidably connected to the inner rod (102). A second spring (104) is provided on the inner side of the extension rod (10). The two ends of the second spring (104) are respectively fixedly connected to one end of the inner rod (102) and the inner side of one end of the extension rod (10). The end of the inner rod (102) can contact the outer side of the tube (1). The end of the extension rod (10) is fixedly connected to the displacement sensor (101). The detection end of the displacement sensor (101) is connected to the inner rod (102).

6. The device for judging the state of a boiler heating surface based on the concave-convex amount according to claim 1 or 2, characterized in that: The outer side of the extension rod (10) is rotatably connected to a second roller (103), and the outer sides of the upper probe rod (42) and the lower probe rod (41) are rotatably connected to a first roller (43). The first roller (43) and the second roller (103) are used to reduce friction during movement.

7. A method for judging the state of a boiler heating surface based on the amount of concavity and convexity, using the device for judging the state of a boiler heating surface based on the amount of concavity and convexity according to claim 5, characterized in that: The steps are: Step 1: Installation: Put the detachable bottom ring (2), the rotating ring (3) and the connecting ring (7) on the outside of the spiral fin (1a), the bottom ring (2) is a flat support, the extension rod (10) is placed on the spiral fin (1a), and the upper probe rod (42) and the lower probe rod (41) are placed on the upper and lower sides of the spiral fin (1a) respectively; Step 2: Align the bottom ring (2) and rotate the rotating ring (3). During the rotation, observe the expansion and contraction of the displacement sensor (101). Then, align the bottom ring (2) according to the position and expansion of the displacement sensor (101). After the rotating ring (3) rotates one circle, the displacement sensor (101) does not change in value, indicating that the tube (1) is at the center of the bottom ring (2). Step 3: Initialization, select a flat position on the surface of the spiral fin (1a), place the extension rod (10), the upper probe rod (42) and the lower probe rod (41) on the flat position of the spiral fin (1a), and continue to rotate the rotating ring (3). The detection box (4) will rise in a spiral along the spiral fin (1a); Step 4: Data acquisition: Due to the presence of the uneven surface of the spiral fin (1a), when the extension rod (10) passes through the uneven surface of the spiral fin (1a), the connecting ring (7) cannot move evenly when it rises. During the spiral rise of the detection box (4), the actual unevenness of the surface of the spiral fin (1a) changes as the displacement change of the upper probe rod (42) and the lower probe rod (41) minus or plus the distance fluctuation L1 of the extension rod (10).

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