A pipe clamp for controlling the reset and positioning of the tube panels of the boiler heating surface

Abstract

The present application discloses a pipe clamp for controlling the reset and positioning of the out-of-line pipes of the tube panel of the heating surface of the boiler, comprising a clamp and a rotating shaft, wherein the clamp comprises a middle plate, a left plate, and a right plate, wherein the left plate and the right plate are opposite to each other and are respectively provided with shaft holes; the two ends of the rotating shaft are located in the two shaft holes, and the side wall of the rotating shaft comprises an eccentric profile. When in use, the rotating shaft is controlled to rotate in the shaft hole so that the eccentric profile of the rotating shaft abuts against the out-of-line pipe, thereby pushing the out-of-line pipe to move, and finally making the out-of-line pipe and other pipes in the same plane; and after the out-of-line pipe is reset, the rotating shaft can be welded and fixed to the clamp to play a positioning role and prevent it from being out of the line again.

Description

Technical Field

[0001] The present application relates to the technical field of boilers, and more specifically, to a tube clamp for controlling the reset and positioning of tubes out of a tube panel of a heating surface of a boiler. Background Art

[0002] The boiler heating surface tube panel is the main equipment of the boiler. It absorbs the heat generated by the combustion of fuel in the boiler and transfers it to the internal medium. The internal medium evaporates due to the heat to form high-temperature and high-pressure steam. It is generally made of metal pipes that are bent, welded, and assembled to form a sheet-like serpentine tube group, which is called the heating surface tube panel.

[0003] According to the arrangement of the heating surface tubes, the heating surface tube panels can be divided into horizontal and vertical types. The horizontal arrangement of the serpentine tubes is called horizontal, and the vertical arrangement is called vertical. The horizontal heating surface is generally suspended vertically through the suspension tube, and the tube row is fixed by the tube clamp on the suspension tube. The vertical heating surface is generally suspended through the header, and the tube row is generally fixed by bending and winding the heating surface tubes of the tube panel itself to form a clamping screen tube. There is also a way to fix the tube row by welding tube clamps on the tube panel.

[0004] At present, the products of coal-fired power plant boiler fuel combustion are smoke and ash. A small amount of ash falls directly into the cold ash hopper, and a large amount of ash is carried away by the flue gas and flows through the heating surfaces at all levels. The high-temperature flue gas carrying a large amount of ash will inevitably wear the heating surface and reduce the wall thickness. When the wall thickness of the heating surface is reduced to a certain extent, the heating surface will burst and leak under the action of the internal high-temperature and high-pressure steam, causing the unit to leak and shut down. Wear is a common defect of the heating surface and one of the main risks threatening the safety of the unit.

[0005] The main factor causing the aggravated wear is the removal of the heating surface tube. After the removal, the heating surface is directly subjected to the ash particles carried by the high-speed flue gas, which causes rapid thinning. The main reasons for the removal of the heating surface tube are the improper manufacturing and installation of the boiler heating surface, the deformation of the tube due to the limited expansion during the long-term operation of the boiler, the shaking of the tube row, the lack of the fixing device resulting in the unconstrained tube, the large gap between the clamped screen tube and the tube row during operation, and the lack of fixing of the tube row.

[0006] The windward side of the first tube of the tube screen that is subject to wear is equipped with anti-wear devices, such as anti-wear tiles and wear-resistant spray coatings for protection. However, if the lower tube is out of the line, the tube has no anti-wear device and will be directly subjected to the impact of dust particles, and the wall thickness will quickly decrease. Figure 1 Taking the angle shown as an example, the arrow pointing downward from top to bottom in the figure represents the high-speed flue gas carrying ash particles. In the figure, 5 tubes are distributed from top to bottom, and the middle tube is the output tube 5. The position on the right side of the output tube 5 that contacts the high-speed flue gas is prone to wear.

[0007] In summary, how to prevent ash particles from causing wear on the heating surface is an urgent problem to be solved by technical personnel in this field. Summary of the invention

[0008] In view of this, the purpose of the present application is to provide a pipe clamp for controlling the resetting and positioning of the out-of-line pipes of the boiler heating surface tube panel, which can reset the out-of-line pipes and limit the out-of-line pipes after reset to prevent them from being out-of-line again, thereby preventing ash particles from causing wear to the heating surface.

[0009] In order to achieve the above objectives, this application provides the following technical solutions:

[0010] A pipe clamp for controlling the reset and positioning of the tube panels of a boiler heating surface, comprising:

[0011] A clamping plate, the clamping plate comprising a middle plate, a left plate arranged at the left end of the middle plate, and a right plate arranged at the right end of the middle plate and opposite to the left plate, wherein the left plate and the right plate are respectively provided with shaft holes;

[0012] A rotating shaft, the left end and the right end of the rotating shaft are respectively arranged in the shaft hole of the left plate and the shaft hole of the right plate, and the side wall of the rotating shaft includes an eccentric profile for abutting against the out-of-column tube so as to push the out-of-column tube to move when the rotating shaft rotates.

[0013] Optionally, a junction area between the middle plate and the left plate is arc-shaped, and a junction area between the middle plate and the right plate is arc-shaped.

[0014] Optionally, the eccentric profile includes an arcuate curved surface and an axial plane, and a cross section of the eccentric profile perpendicular to the axial direction of the rotating shaft is semicircular.

[0015] Optionally, a radially protruding limit seat is provided at the right end of the rotating shaft.

[0016] Optionally, a truncated cone with a circular cross-section and matched with the axial hole of the right plate is provided between the eccentric contour and the limiting seat, and the eccentric contour extends from the left end face of the rotating shaft to the left end face of the truncated cone.

[0017] Optionally, a first wrench for controlling the rotation of the rotating shaft is further included, wherein the first wrench includes a handle, and the handle is provided with a semicircular contoured hole for matching with the eccentric profile.

[0018] Optionally, a protruding structure for convenient twisting is provided on a side of the limiting seat away from the eccentric contour.

[0019] Optionally, a second wrench for controlling the rotation of the rotating shaft is further included, the second wrench including a first rod body and a second rod body distributed in an L shape, the length of the first rod body is different from the length of the second rod body, and both ends of the second wrench are respectively provided with groove structures for cooperating with the protruding structure.

[0020] Through the above scheme, the beneficial effects of the pipe clamp for controlling the resetting and positioning of the tube panels of the heating surface of the boiler provided by the present application are:

[0021] The pipe clamp provided by the present application includes a clamp and a rotating shaft. The clamp includes a middle plate, a left plate, and a right plate. The left plate and the right plate are opposite to each other and are respectively provided with shaft holes. The two ends of the rotating shaft are located in the two shaft holes, and the side wall of the rotating shaft includes an eccentric profile. When in use, there is a receiving space between the clamp and the rotating shaft for accommodating multiple pipes. When multiple pipes are placed in the receiving space, the rotating shaft is controlled to rotate in the shaft hole so that the eccentric profile of the rotating shaft abuts against the out-of-line pipe, thereby pushing the out-of-line pipe to move, and finally making the out-of-line pipe and other pipes in the same plane.

[0022] The pipe clamp provided in the present application can reset the out-of-line pipe, and after the shaft is rotated into place, it can be fixed to the clamp by welding or other means, thereby playing a positioning role and preventing it from being out of line again. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application 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 embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0024] Figure 1 It is a schematic diagram of the principle of heating surface tube panel wear in the prior art;

[0025] Figure 2 A top view of a vertical heating surface tube panel after a tube clamp is installed and before the out-of-line tubes are reset;

[0026] Figure 3 for Figure 2 The front view of the vertical heating surface tube panel and the tube clamp shown;

[0027] Figure 4 for Figure 2 The vertical heating surface tube panel shown in the figure cooperates with the tube clamp to reset the out-of-line tubes;

[0028] Figure 5 for Figure 4 The front view of the vertical heating surface tube panel and the tube clamp shown;

[0029] Figure 6 A top view of a vertical heating surface tube panel after a tube clamp is installed and before the out-of-line tubes are reset;

[0030] Figure 7 for Figure 6 The front view of the vertical heating surface tube panel and the tube clamp shown;

[0031] Figure 8 for Figure 6 The vertical heating surface tube panel shown in the figure cooperates with the tube clamp to reset the out-of-line tubes;

[0032] Fig. 9 for Figure 6 The front view of the vertical heating surface tube panel and the tube clamp shown;

[0033] Fig.10 A side view of a horizontal heating surface tube panel after a tube clamp is installed and before the out-of-line tubes are reset;

[0034] Fig.11 for Fig.10 Side view of the middle horizontal heating surface tube panel and tube clamps after the out-of-row tubes are reset;

[0035] Fig.12 is a structural schematic diagram of a rotating shaft;

[0036] Fig.13 for Fig.12 A front view of the rotating shaft shown;

[0037] Fig.14 for Fig.12 a side view of the shaft shown;

[0038] Fig.15 is a schematic diagram of the structure of another rotating shaft;

[0039] Fig.16 for Fig.15 A front view of the rotating shaft shown;

[0040] Fig.17 for Fig.15 a side view of the shaft shown;

[0041] Fig.18 It is a schematic diagram of the structure of a splint;

[0042] Fig.19 for Fig.18 A front view of the splint shown;

[0043] Fig. 20 for Fig.18 a side view of the splint shown;

[0044] Fig.21 is a structural schematic diagram of a first wrench;

[0045] Fig. 22 for Fig.21 A front view of the first wrench shown;

[0046] Fig.23 is a top view of a first wrench;

[0047] Fig.24 is the front view of the second wrench;

[0048] Fig.25 is Fig.24 the side view of the second wrench shown in;

[0049] Fig.26 is a schematic structural diagram of a second wrench operating in a horizontal heating surface tube panel;

[0050] Fig. 27 is a schematic structural diagram of a second wrench operating in a heating surface tube panel;

[0051] Fig.28 is a schematic structural diagram of a second wrench operating in a heating surface tube panel.

[0052] Figures 1 to 28 The reference numerals in are: clamping plate 1, left plate 11, middle plate 12, right plate 13, shaft hole 14; rotating shaft 2, eccentric profile 21, frustum 22, limiting seat 23, protruding structure 24; first wrench 3, profiling hole 31; second wrench 4, groove structure 41; out-of-line tube 5. Detailed implementation manners

[0053] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0054] Please refer to Figures 2 to 28 , the pipe clamp for controlling the reset and positioning of the out-of-line tube of the boiler heating surface tube panel provided by the present application may include: a clamping plate 1, a rotating shaft 2, and a wrench.

[0055] The clamping plate 1 includes a left plate 11, a middle plate 12, and a right plate 13, which are distributed in a "C" shape, that is, the left plate 11 is arranged at the left end of the middle plate 12, the right plate 13 is arranged at the right end of the middle plate 12, and the left plate 11 and the right plate 13 are oppositely distributed. The left plate 11 and the right plate 13 are respectively provided with shaft holes 14, and the shaft holes 14 of the two are opposite to install the rotating shaft 2. During actual processing, the clamping plate 1 can be made by bending a single plate. In addition, in order to increase the contact area between the clamping plate 1 and the pipe, the junction area between the middle plate 12 and the left plate 11 can be set as an arc transition, and the junction area between the middle plate 12 and the right plate 13 can be set as an arc transition.

[0056] The left end and the right end of the rotating shaft 2 are respectively arranged in the shaft hole 14 of the left plate 11 and the shaft hole 14 of the right plate 13, and the rotating shaft 2 can rotate in the shaft hole 14. The side wall of the rotating shaft 2 includes an eccentric profile 21, and the eccentric profile 21 abuts against the out-of-column pipe 5 when the rotating shaft 2 rotates, thereby pushing the out-of-column pipe 5 to move.

[0057] There are many options for the specific structure of the rotating shaft 2:

[0058] In an embodiment of a specific structure of the rotating shaft 2, the cross-sections at both ends of the rotating shaft 2 are circular to cooperate with the axial holes 14 of the left plate 11 and the right plate 13; and the eccentric profile 21 is located in the middle of the rotating shaft 2, and the cross-section of the eccentric profile 21 is cam-shaped, thereby pushing the out-of-column tube 5 to move when the rotating shaft 2 rotates.

[0059] In another embodiment of the specific structure of the rotating shaft 2, the cross section of the eccentric profile 21 is semicircular, and the cross section refers to the cross section perpendicular to the axial direction of the rotating shaft 2. The semicircle here not only specifically refers to half of a circle, that is, not only specifically refers to the case where the thickness H of the eccentric profile 21 is the same as the radius of the arc surface, but also includes the case of a large semicircle or a small semicircle. At this time, the eccentric profile 21 includes an arc surface and an axial plane, wherein the edge of the arc surface has a relatively distributed arc left end and an arc right end, and also has two relatively distributed straight side edges. The axial plane is rectangular, and its edge has a relatively distributed left end and a relatively distributed right end, and also has two relatively distributed side edges, and the two side edges, the left end, and the right end are connected end to end to form a rectangular structure. And the side edge of the arc surface contacts the side edge of the axial plane.

[0060] When this type of shaft 2 is used, during the rotation of the shaft 2, the side and / or eccentric profile 21 where the arc surface contacts the axial plane will push the out-of-line tube 5 to move. In addition, during actual processing, the columnar structure can be cut along its axial direction to obtain the shaft 2, thereby making the processing of the shaft 2 more convenient.

[0061] In another embodiment of the specific structure of the rotating shaft 2, a radially protruding limit seat 23 is provided at the right end of the rotating shaft 2. The limit seat 23 can be attached to the plate surface of the left plate 11 or the right plate 13, thereby limiting the axial position of the rotating shaft 2 after installation.

[0062] During the on-site trial installation of the sample produced by the structure of the rotating shaft 2 without the limit seat 23, it was found that when the horizontally arranged heating surface tubes were removed from the row, if the rotating shaft 2 was inserted into the pipe clamp from top to bottom, the rotatable end of the rotating shaft 2 (i.e., the end without the limit seat 23) was at the bottom. Because the horizontal pipe row is generally arranged very densely, the construction workers could not rotate the rotating shaft 2 during construction; if the rotating shaft 2 was inserted into the pipe clamp from bottom to top, the rotating shaft 2 would easily fall down, making installation more difficult. When the vertical heating surface tubes were removed from the row, the pipe clamps were arranged horizontally, and the above problems did not exist when using this type of rotating shaft 2. Therefore, this type of rotating shaft 2 is suitable for the removal of the vertically arranged heating surface tube screen. In addition, a single-sided shaft shoulder is formed at the limit seat 23. When the shaft shoulder cooperates with the shaft hole 14 of the clamp 1, the stability of the rotating shaft 2 is better when it rotates.

[0063] In another embodiment of the specific structure of the rotating shaft 2, a truncated cone 22 with a circular cross section is provided between the eccentric profile 21 and the limiting seat 23, and the eccentric profile 21 extends from the left end face of the rotating shaft 2 to the left end face of the truncated cone 22. The rotating shaft 2 cooperates with the shaft hole 14 through the truncated cone 22, further improving the stability of the rotating shaft 2 during rotation.

[0064] In another embodiment of the specific structure of the rotating shaft 2, a protruding structure 24 for convenient twisting is provided on the side of the limiting seat 23 away from the eccentric profile 21. When processing the removal of the horizontally arranged heating surface tubes, the rotating shaft 2 is inserted into the axial hole 14 of the clamping plate 1 from top to bottom, and the protruding structure 24 on the rotating shaft 2 is rotated using the L-shaped second wrench to rotate the rotating shaft 2. The L-shaped second wrench can solve the problem that the rotating shaft 2 cannot rotate during construction due to the dense arrangement of the horizontal tube screen. Moreover, this type of rotating shaft 2 is also suitable for processing the removal of the vertically arranged heating surface tubes, but the processing cost is slightly increased compared to the cost of the rotating shaft 2 without the protruding structure 24. When processing the removal of the heating surface tubes, the rotating shaft 2 with different structures can be selected according to the different processing positions to help reduce costs.

[0065] The wrench is used to assist the user in controlling the rotation of the shaft 2. If the user can manually rotate the shaft 2 without the aid of a tool, the wrench can be omitted. There are many options for the structure of the wrench. In the present application, the wrench can include a first wrench 3 and / or a second wrench 4.

[0066] The first wrench 3 is suitable for the case where the end of the rotating shaft 2 has an eccentric profile 21. The first wrench 3 comprises a handle, and the handle is provided with a semicircular profiling hole 31 for matching with the eccentric profile 21.

[0067] The second wrench 4 is suitable for the case where the rotating shaft 2 is provided with a protruding structure 24. The second wrench 4 includes a first rod body and a second rod body distributed in an L shape, the length L3 of the first rod body and the length L4 of the second rod body are different, and both ends of the second wrench 4 are respectively provided with a groove structure 41 for matching with the protruding structure 24, so that the second wrench 4 is suitable for the occasion where the pipe clamp is installed in the horizontal arrangement of the heating surface tube panel and the depth of the out-row tubes 5 is different.

[0068] The usage of the pipe clamps provided in this application is as follows:

[0069] When the number of pipes out of the queue is small, the pipe clamp is directly installed, inserted into the rotating shaft 2 and rotated, and the out-of-queue pipe 5 is reset through the rotating shaft 2; when the number of pipes out of the queue is serious, auxiliary means such as a crowbar or a hand winch can be used to reset the out-of-queue pipe 5 as much as possible, and then the pipe clamp is installed. The pipe clamp relies on the nearby unout-of-queue pipe 5, and controls the rotation of the rotating shaft 2. The eccentric profile 21 of the rotating shaft 2 acts on the out-of-queue pipe 5 to reset the out-of-queue pipe 5; the rotating shaft 2 is rotated and welded to the clamp 1. The pipe clamp can not only reset the out-of-queue pipe 5, but also position the out-of-queue pipe 5 to prevent the pipe from being out of the queue again.

[0070] In practical applications, the number of additional pipe clamps can be selected according to the length of the out-of-line pipe 5. When the out-of-line length is short, one set of pipe clamps can be installed. When the out-of-line length is long, two or more sets of pipe clamps can be installed. When out-of-line, first install a set of pipe clamps at the most serious part of the out-of-line. If all the out-of-line pipes 5 can be reset, one set of pipe clamps is enough; if one set of pipe clamps cannot reset all the out-of-line pipes 5, one or more sets of pipe clamps can be added. The pipe clamp can be installed horizontally to handle the out-of-line of vertical heating surface tube panels, or it can be installed vertically to handle the out-of-line of horizontal heating surface tube panels.

[0071] It can be seen from the above embodiments that the beneficial effects of the pipe clamp for controlling the resetting and positioning of the tube panels of the heating surface of the boiler provided by the present application are:

[0072] The pipe clamp provided in the present application can be applied to the hanging of the tube panel of the heating surface of the boiler. First, after the pipe clamp provided in the present application is installed on the pipe, the eccentric profile 21 of the shaft 2 acts on the out-of-line tube 5 by rotating the rotating shaft 2, thereby resetting the out-of-line tube 5; at the same time, the rotating shaft 2 after rotation can be fixed with the clamp 1 by welding or other means, and can also play a positioning role to prevent it from being out of line again. Second, since there is no need to modify the heating surface tube, it will not affect the safety of the heating surface of the boiler. Third, the pipe clamp can handle multiple tube rows that are out of line at the same time by modifying the length L2 of the clamp 1 and the length L of the eccentric profile 21. Or the pipe clamp can be adapted to different heating surface tube panels by adjusting the length L2 of the clamp 1, the bending radius R of the clamp 1, and the length L of the eccentric profile 21, so as to handle the problem of tube panel out-of-line with different heating surface pipe diameters and different heating surface tube spacings, and has a wide range of applications.

[0073] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0074] The above is a detailed introduction to the pipe clamps provided by the present application for controlling the resetting and positioning of the tubes out of the tube screen of the boiler heating surface. This article uses specific examples to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A pipe clamp for controlling the reset and positioning of the tube panels of the heating surface of a boiler, characterized in that: include: A clamping plate (1), the clamping plate (1) comprising a middle plate (12), a left plate (11) arranged at the left end of the middle plate (12), and a right plate (13) arranged at the right end of the middle plate (12) and arranged opposite to the left plate (11), the left plate (11) and the right plate (13) respectively being provided with an axis hole (14); A rotating shaft (2), the left end and the right end of the rotating shaft (2) being respectively arranged in the shaft hole (14) of the left plate (11) and the shaft hole (14) of the right plate (13), and the side wall of the rotating shaft (2) comprising an eccentric profile (21) for abutting against the out-of-column tube (5) so as to push the out-of-column tube (5) to move when the rotating shaft (2) rotates; The eccentric profile (21) comprises an arcuate curved surface and an axial plane, and a cross section of the eccentric profile (21) perpendicular to the axial direction of the rotating shaft (2) is semicircular; The right end of the rotating shaft (2) is provided with a radially protruding limiting seat (23); A truncated cone (22) having a circular cross-section and cooperating with the shaft hole (14) of the right plate (13) is provided between the eccentric contour (21) and the limiting seat (23); the eccentric contour (21) extends from the left end surface of the rotating shaft (2) to the left end surface of the truncated cone (22); It also includes a first wrench (3) for controlling the rotation of the rotating shaft (2), the first wrench (3) comprising a handle, the handle being provided with a semicircular contoured hole (31) for cooperating with the eccentric profile (21); A protruding structure (24) for convenient twisting is provided on a side of the limiting seat (23) away from the eccentric profile (21); It also includes a second wrench (4) for controlling the rotation of the rotating shaft (2), the second wrench (4) comprising a first rod body and a second rod body arranged in an L shape, the length of the first rod body and the length of the second rod body being different, and groove structures (41) for cooperating with the protrusion structure (24) are respectively provided at both ends of the second wrench (4); The junction area between the middle plate (12) and the left plate (11) is arc-shaped, and the junction area between the middle plate (12) and the right plate (13) is arc-shaped.

Images