A drawing heat transfer tube device and an operation method

Abstract

The present invention discloses a device and an operation method for drawing heat transfer tubes, which include a tightening device, a limiting sleeve, a tube drawing device, a screw sleeve, a screw mandrel, an adjusting ring, an expansion ring and a locking member; the screw sleeve is sleeved on the screw mandrel; the tube drawing device is threadedly connected to the screw mandrel and is arranged adjacent to the screw sleeve; the limiting sleeve is sleeved on the screw mandrel; the limiting sleeve is provided with an oblong hole, and the tube drawing device passes through the oblong hole; the tightening device is threadedly connected to the screw mandrel and is located at one end of the limiting sleeve; a plurality of adjusting rings and a plurality of expansion rings can be sleeved on the screw mandrel for use in drawing and guiding tubes; the front end of the screw sleeve can abut against the adjusting ring or the expansion ring; the locking member is detachably arranged on the screw mandrel for restricting the adjusting ring or the expansion ring from disengaging from the screw mandrel. The present invention can draw and guide the heat transfer tubes, and can solve the problem that the heat transfer tubes of the current nuclear power steam generator are stuck and cannot be normally inserted into the tube sheet during tube insertion.

Description

Technical Field

[0001] The present invention belongs to the technical field of nuclear power, and particularly relates to a device and an operation method for drawing heat transfer tubes. Background Art

[0002] Refer to the structure of the tube bundle assembly of a typical nuclear power steam generator 8 shown in the appendix Figure 25 As shown, its length exceeds 10 meters, and it is provided with several layers of heat transfer tube support plates 81. The structure of the heat transfer tube 9 is U-shaped, and the main installation process requirements for tube threading are as follows:

[0003] (1) The U-shaped heat transfer tube 9 is inserted through the end of the D-shaped cone cylinder 83 on the second side Figure 25 ;

[0004] (2) The two leg portions 91 of the U-shaped heat transfer tube 9 pass through the support plates 81 layer by layer synchronously, and then enter the tube holes of the tube sheet 82.

[0005] Under normal tube threading conditions, the tube threading operator applies an appropriate thrust to the heat transfer tube 9 at the end of the cone cylinder 83, and the heat transfer tube 9 can reach its installation position smoothly. However, due to certain probability deviations (design accuracy tolerances) in the machining of the tube holes of each support plate 81 and the tube sheet 82, especially when the cumulative deviation of the tube holes at the same position approaches or reaches the upper limit of the tolerance, although the heat transfer tube has a certain flexibility, there is still a situation where the heat transfer tube gets stuck. Just applying a thrust to the heat transfer tube at the bent tube section 92 (located at the end of the cone cylinder 83) cannot make the heat transfer tube reach the predetermined position. For each nuclear power steam generator (some have more than 10,000 tube sheet tube holes), dealing with such a heat transfer tube threading jamming problem is rather troublesome.

[0006] Refer to Figure 25 , the depth K of the tube holes of the tube sheet is 600 mm - 800 mm. The leg portion 91 of the heat transfer tube 9 enters the tube holes of the tube sheet 82. The gap between the heat transfer tube and the tube holes of the tube sheet is small, and the slight deflection generated during the tube threading process of the heat transfer tube easily causes the heat transfer tube to get stuck in the tube holes of the tube sheet. Once the heat transfer tube gets stuck, at this time, it is very difficult to make the heat transfer tube move further by applying a thrust at the bent tube section 92. The staff on the secondary side M of the tube sheet 82 is inaccessible, and only the tube holes on the primary side N of the tube sheet are the only channels. However, the tube holes of the tube sheet have a small diameter and a large depth, and conventional tools cannot reach them. Therefore, at present, it is necessary to develop a special tool to draw and guide the tube from the primary side of the tube sheet.

[0007] As can be seen from the above, at present, there is a lack of a device for drawing heat transfer tubes to draw and guide the tube to solve the problem that the heat transfer tube of the nuclear power steam generator gets stuck and cannot be normally inserted into the tube sheet during tube threading. At present, there is also a lack of an operation method for the device for drawing heat transfer tubes to scientifically guide people to use the new device for drawing heat transfer tubes to draw and guide the stuck heat transfer tube.

[0008] Therefore, a new technology is needed to solve the problem that there is a lack of a drawing heat transfer tube device in the prior art; a new technology is needed to solve the problem that there is a lack of an operation method for a drawing heat transfer tube device in the prior art. Summary of the Invention

[0009] To solve the above problems in the prior art, the present invention provides a drawing heat transfer tube device, which can draw the lead tube and solve the problem that the heat transfer tube of the nuclear power steam generator cannot be inserted into the tube sheet normally due to jamming during tube insertion.

[0010] The present invention adopts the following technical solutions:

[0011] A drawing heat transfer tube device includes a tightening device, a limit sleeve, a drawing tube device, a screw sleeve, a screw mandrel, a plurality of adjusting rings, a plurality of expansion rings and a locking member; the screw sleeve is sleeved on the screw mandrel; the drawing tube device is threadedly connected to the screw mandrel and is disposed adjacent to the screw sleeve; the limit sleeve is sleeved on the screw mandrel; the limit sleeve is provided with an oblong hole, and the drawing tube device passes through the oblong hole; the tightening device is threadedly connected to the screw mandrel and is located at one end of the limit sleeve; a plurality of the adjusting rings and a plurality of the expansion rings can be sleeved on the screw mandrel for drawing the lead tube; the front end of the screw sleeve can abut against the adjusting ring or the expansion ring; the locking member is detachably disposed on the screw mandrel for restricting the adjusting ring or the expansion ring from detaching from the screw mandrel.

[0012] Further, the tightening device includes a tightening body and a first handle; the tightening body has a first threaded hole, and the tightening body is connected to the screw mandrel through the first threaded hole; the tightening body has a second threaded hole, and the tightening body is connected to the first handle through the second threaded hole.

[0013] Further, the drawing tube device includes a drawing body and a second handle; the drawing body has a third threaded hole, and the drawing body is connected to the screw mandrel through the third threaded hole; the drawing body has a fourth threaded hole, and the drawing body is threadedly connected and fixed to the second handle through the fourth threaded hole, and the second handle passes through the oblong hole.

[0014] Further, the screw sleeve has a first sleeve and a second sleeve; the first sleeve and the second sleeve are integrally connected, and the outer diameter of the first sleeve is smaller than the outer diameter of the second sleeve; the front end of the first sleeve can abut against the adjusting ring or the expansion ring.

[0015] Further, it further includes a first isolation washer, a second isolation washer and a third isolation washer; the first isolation washer is sleeved on the screw mandrel and is located between the tightening device and the limit sleeve; the second isolation washer is sleeved on the screw mandrel and is located between the drawing tube device and the screw sleeve; the third isolation washer is sleeved on the screw sleeve and is located at the front end of the limit sleeve.

[0016] Further, the screw mandrel includes a threaded section, a first smooth shaft section, a second smooth shaft section and a tail section; the threaded section, the first smooth shaft section, the second smooth shaft section and the tail section are connected in sequence; the tightening device and the drawing tube device are respectively threadedly connected to the threaded section; a ring piece is provided between the threaded section and the first smooth shaft section, and the diameter of the first smooth shaft section is adapted to the inner diameter of the first sleeve of the screw sleeve; the diameter of the first smooth shaft section is larger than the diameter of the second smooth shaft section; the adjusting ring and the expansion ring can be sleeved on the second smooth shaft section; the diameter of the second smooth shaft section is larger than the diameter of the tail section; the tail section is provided with threads, and the locking member can be threadedly connected to the tail section.

[0017] Further, the locking member includes a first circular shaft section and a second circular shaft section, the first circular shaft section and the second circular shaft section are connected together, and the outer diameter of the first circular shaft section is larger than the outer diameter of the second circular shaft section; the locking member has a threaded through hole, the threaded through hole penetrates through the first circular shaft section and the second circular shaft section, and the threaded through hole can be threadedly connected to the screw mandrel.

[0018] Further, it further includes a positioning device, and the positioning device includes an ear plate and a positioning screw; a notch is opened at a set position of the limit sleeve, and the ear plate is fixed on the screw sleeve through the notch; the positioning screw is detachably arranged on the ear plate, and the positioning screw is used for penetrating into the tube plate tube hole for positioning.

[0019] Further, the positioning device further includes a silica gel ring, and the silica gel ring is sleeved on the positioning screw.

[0020] Another object of the present invention is to provide an operation method for a drawing heat transfer tube device to scientifically guide people to use the new drawing heat transfer tube device to draw and guide the stuck heat transfer tubes.

[0021] An operation method for a drawing heat transfer tube device, which is carried out based on the drawing heat transfer tube device, includes the following steps:

[0022] S1. Determine the sticking depth of the heat transfer tube;

[0023] S2. According to the sticking depth of the heat transfer tube, determine the required quantities of the adjusting ring and the expansion ring;

[0024] S3. Adjust the positions of the adjusting ring and the expansion ring sleeve on the screw mandrel. After adjustment, install the locking member on the screw mandrel.

[0025] S4. Adjust the position of the drawing tube device so that the drawing tube device abuts against the first end of the long circular hole.

[0026] S5. Insert the screw mandrel with the expansion ring into the target tube hole.

[0027] S6. Rotate the tightening device so that the expansion ring expands under the extrusion pressure and expands and tightens in the tube hole of the heat transfer tube.

[0028] S7. Slowly draw the drawing tube device towards the first side to pull the heat transfer tube towards the primary side of the tube sheet.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0030] In a heat transfer tube drawing device of the present invention, an expansion ring on the screw mandrel expands under force and tightens in the tube hole of the heat transfer tube, establishing a connection relationship between the screw mandrel and the heat transfer tube, enabling the screw mandrel to drive the heat transfer tube and realizing drawing and guiding of the tube. The present invention can solve the problem that the heat transfer tube gets stuck and cannot be normally inserted into the tube sheet in the current nuclear power steam generator.

[0031] For the manufacturing of tube bundles of heat exchangers such as nuclear power steam generators, when the heat transfer tube gets stuck and cannot reach the set insertion position, tube withdrawal treatment is often required. There are two major drawbacks in tube withdrawal treatment: one is that the withdrawn heat transfer tube probably has visible scratches on the surface and cannot be reused and is scrapped; the other is that there is a high risk that large foreign objects will fall into the inaccessible area inside the tube bundle during tube withdrawal operation. The appearance of the present invention effectively avoids the tube withdrawal treatment of the heat transfer tube. The heat transfer tube drawing device of the present invention can handle the "heat transfer tube that gets stuck and cannot be normally inserted" at the primary side of the tube sheet, avoiding the problems of tube withdrawal and scrapping of the heat transfer tube and the corresponding tube withdrawal risks, reducing the manufacturing cost of the nuclear power steam generator, and improving the manufacturing efficiency of the nuclear power steam generator.

[0032] A method for operating a heat transfer tube drawing device of the present invention is specially designed for the new heat transfer tube drawing device, and can scientifically guide people to use the new heat transfer tube drawing device to draw and guide the stuck heat transfer tube, effectively avoiding mechanical component damage caused by incorrect operation due to insufficient understanding of the new heat transfer tube drawing device by people. Description of the Drawings

[0033] The following further elaborates in detail on the technology of the present invention in conjunction with the drawings and specific embodiments:

[0034] Figure 1It is the front view of the drawing heat transfer tube device of the present invention;

[0035] Figure 2 It is the three-dimensional schematic diagram of the drawing heat transfer tube device of the present invention;

[0036] Figure 3 It is the schematic diagram of the drawing heat transfer tube device of the present invention being introduced into the tube holes of the tube sheet for drawing and guiding the heat transfer tube;

[0037] Figure 4 It is Figure 3 The partial enlarged view at Q;

[0038] Figure 5 It is the three-dimensional schematic diagram of the tightening body of the present invention;

[0039] Figure 6 It is the three-dimensional schematic diagram of the first handle of the present invention;

[0040] Figure 7 It is the three-dimensional schematic diagram of the first isolation washer of the present invention;

[0041] Figure 8 It is the three-dimensional schematic diagram of the first perspective of the limit sleeve of the present invention;

[0042] Figure 9 It is the three-dimensional schematic diagram of the second perspective of the limit sleeve of the present invention;

[0043] Figure 10 It is the three-dimensional schematic diagram of the drawing body of the present invention;

[0044] Figure 11 It is the three-dimensional schematic diagram of the second handle of the present invention;

[0045] Figure 12 It is the three-dimensional schematic diagram of the second isolation washer of the present invention;

[0046] Figure 13 It is the three-dimensional schematic diagram of the first perspective of the screw sleeve of the present invention;

[0047] Figure 14 It is the three-dimensional schematic diagram of the second perspective of the screw sleeve of the present invention;

[0048] Figure 15 It is the three-dimensional schematic diagram of the third isolation washer of the present invention;

[0049] Figure 16 It is the three-dimensional schematic diagram of the screw mandrel of the present invention;

[0050] Figure 16a It is the partial enlarged view of the screw mandrel of the present invention (showing the threaded section, ring piece, first optical axis section, second optical axis section);

[0051] Figure 16bIt is a partial enlarged view of the screw mandrel of the present invention (showing the second optical axis section and the tail section);

[0052] Figure 17 It is a three-dimensional schematic diagram of the adjusting ring of the present invention;

[0053] Figure 18 It is a three-dimensional schematic diagram of the expansion ring of the present invention;

[0054] Figure 19 It is a three-dimensional schematic diagram of the locking member from the first perspective of the present invention;

[0055] Figure 20 It is a three-dimensional schematic diagram of the locking member from the second perspective of the present invention;

[0056] Figure 21 It is a three-dimensional schematic diagram of the positioning device of the present invention;

[0057] Figure 22 It is Figure 21 A three-dimensional schematic diagram of the middle ear plate;

[0058] Figure 23 It is Figure 21 A three-dimensional schematic diagram of the middle positioning screw;

[0059] Figure 24 It is Figure 21 A three-dimensional schematic diagram of the middle silica gel ring;

[0060] Figure 25 It is a plan view of the nuclear power steam generator of the present invention.

[0061] Reference numerals:

[0062] 1 - Drawing heat transfer tube device; 11 - Adjusting ring; 12 - Expansion ring; 13 - Locking member; 131 - First circular shaft section; 132 - Second circular shaft section; 133 - Threaded through hole; 14 - First isolation washer; 15 - Second isolation washer; 16 - Third isolation washer; C - First side; D - Second side;

[0063] 2 - Tightening device; 21 - Tightening body; B - First central axis; 211 - First threaded hole; 212 - Second threaded hole; 213 - Chamfered surface; 22 - First handle; 221 - First threaded portion; A - Second central axis; P - Included angle;

[0064] 3 - Limit sleeve; 31 - Long circular hole; G - First end; H - Second end; 32 - Notch;

[0065] 4 - Drawing tube device; 41 - Drawing body; F - Third central axis; 411 - Third threaded hole; 412 - Fourth threaded hole; 42 - Second handle; 421 - Second threaded portion; E - Fourth central axis;

[0066] 5 - Screw sleeve; 51 - First sleeve; 511 - First inner cavity; 52 - Second sleeve; 521 - Second inner cavity;

[0067] 6 - Screw mandrel; 61 - Threaded section; 611 - Ring piece; 62 - First optical axis section; 63 - Second optical axis section; 64 - Tail section;

[0068] 7 - Positioning device; 71 - Ear plate; 711 - Fifth threaded hole; 72 - Positioning screw; 721 - Third threaded part; 722 - Limiting ring; 73 - Silicone rubber ring;

[0069] 8 - Nuclear power steam generator; 81 - Support plate; 82 - Tube sheet; 821 - Tube holes in the tube sheet; 83 - Conical cylinder; K - Depth; M - Secondary side; N - Primary side; Q - Local enlarged drawing label;

[0070] 9 - Heat transfer tube; 91 - Branch pipe leg; 92 - Bent pipe section; 93 - Tube hole. Detailed implementation manners

[0071] The concept, specific structure and technical effects of the present invention will be clearly and completely described below in conjunction with embodiments and drawings, so as to fully understand the purpose, scheme and effects of the present invention. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The same reference numerals used throughout the drawings indicate the same or similar parts.

[0072] It should be noted that, unless otherwise specified, when a feature is referred to as "fixed" or "connected" to another feature, it can be directly fixed or connected to the other feature, or indirectly fixed or connected to the other feature. In addition, the up, down, left, right, etc. descriptions used in the present invention are only relative to the mutual positional relationship of the components of the present invention in the drawings.

[0073] Refer to Figures 1 to 24, A drawing heat transfer tube device 1, comprising a tightening device 2, a limiting sleeve 3, a drawing tube device 4, a screw sleeve 5, a screw mandrel 6, a plurality of adjusting rings 11, a plurality of expansion rings 12 and a locking member 13; the screw sleeve 5 is sleeved on the screw mandrel 6; the drawing tube device 4 is threadedly connected to the screw mandrel 6 and is disposed adjacent to the screw sleeve 5; the limiting sleeve 3 is sleeved on the screw mandrel 6; the limiting sleeve 3 is provided with a long circular hole 31, and the drawing tube device 4 passes through the long circular hole 31; the tightening device 2 is threadedly connected to the screw mandrel 6 and is located at one end of the limiting sleeve 3; a plurality of the adjusting rings 11 and a plurality of the expansion rings 12 can be sleeved on the screw mandrel 6 for use in drawing the guide tube; the front end of the screw sleeve 5 can abut against the adjusting ring 11 or the expansion ring 12; the locking member 13 is detachably provided on the screw mandrel 6 for restricting the adjusting ring 11 or the expansion ring 12 from disengaging from the screw mandrel 6.

[0074] Referring to Figures 1 to 24 , In one embodiment, the adjusting ring 11 is a rigid adjusting ring, the material of the adjusting ring 11 is stainless steel 0Cr18Ni9, and the adjusting ring 11 can be used to extrude the expansion ring 12. According to the different depth positions where the heat transfer tube 9 is stuck in the tube plate tube hole 821, an appropriate number of adjusting rings 11 can be sleeved on the screw mandrel 6. By adjusting the number of the adjusting rings 11, the expansion ring 12 can be forced to expand within the tube plate tube hole 821 at a set depth, establishing a connection between the screw mandrel 6 and the heat transfer tube 9, so that the heat transfer tube 9 "stuck at different depth positions in the tube plate tube hole" can be effectively drawn.

[0075] Referring to Figures 1 to 24 , In one embodiment, the material of the expansion ring 12 is silica gel, and its Shore hardness is 65-75. A plurality of the expansion rings 12 can be sleeved on the screw mandrel 6. Therefore, according to the different depth positions where the heat transfer tube 9 is stuck in the tube plate tube hole 821, an appropriate number of expansion rings 12 can be selected and used in combination with the number of the adjusting rings 11, so that all the expansion rings 12 can enter the tube holes 93 of the branch legs 91 of the heat transfer tube 9. Then, by rotating (such as tightening) the tightening device 2, the screw mandrel 6 moves towards " Figure 3 the first side C", so that the screw mandrel 6 drives the locking member 13 to squeeze the adjusting ring 11, so that the adjusting ring 11 can squeeze the axial length of the expansion ring 12, so that the expansion ring 12 can expand radially to achieve the purpose of tightly connecting the heat transfer tube 9. At the same time, during the process of tightly connecting the heat transfer tube 9, the expansion ring 12 can effectively improve the deflection of the heat transfer tube 9 and improve the stuck condition of the heat transfer tube 9.

[0076] Referring toFigures 1 to 24 , in one embodiment, the tightening device 2 includes a tightening body 21 and a first handle 22; the tightening body 21 has a first threaded hole 211, and the tightening body 21 is connected to the screw core shaft 6 through the first threaded hole 211; the tightening body 21 has a second threaded hole 212, and the tightening body 21 is connected to the first threaded portion 221 of the first handle 22 through the second threaded hole 212.

[0077] Refer to Figures 1 to 24 , in one embodiment, the materials of the tightening body 21 and the first handle 22 are both stainless steel 0Cr18Ni9; a plurality of first handles 22 are evenly arranged on the tightening body 21. Preferably, two first handles 22 are provided on the tightening body 21, and the two first handles 22 are arranged on the tightening body 21 at an inclined set angle. The second central axis A of each first handle 22 forms a plane angle P of 60° with the first central axis B of the tightening body 21; with the first central axis B of the tightening body 21 as the symmetry center line, the two first handles 22 are symmetrically arranged on the tightening body 21. By rotating (such as tightening) the tightening body 21 through the first handle 22, the screw core shaft 6 can move towards the " Figure 3 first side C shown", reducing the length of the screw core shaft 6 on the second side D, and then driving the locking member 13. The locking member 13 presses the adjusting ring 11, and the adjusting ring 11 then presses the expansion ring 12, thereby compressing the axial length of the expansion ring 12, causing the expansion ring 12 to expand radially, achieving the purpose of tightly connecting the heat transfer tube 9, thus establishing the connection between the screw core shaft 6 and the heat transfer tube 9, and then realizing the drawing of the heat transfer tube 9 by pulling the drawing tube device 4.

[0078] Refer to Figures 1 to 24 , preferably, to better realize the installation of the first handle 22, a chamfered surface 213 is provided on the tightening body 21. The chamfered surface 213 forms a set angle with the first central axis B of the tightening body 21. Specifically, if the direction of the first central axis B of the tightening body extending towards the second side D is defined as the positive direction, the chamfered surface 213 forms an angle of 30° with the positive direction of the first central axis B of the tightening body 21.

[0079] Refer to Figures 1 to 24, in one embodiment, the drawing tube device 4 includes a drawing body 41 and a second handle 42; the drawing body 41 has a third threaded hole 411, and the drawing body 41 is connected to the screw mandrel 6 through the third threaded hole 411; the drawing body 41 has a fourth threaded hole 412, and the drawing body 41 is threadedly connected and fixed to the second threaded portion 421 of the second handle 42 through the fourth threaded hole 412, and the second handle 42 passes through the oblong hole 31.

[0080] Refer to Figures 1 to 24 , in one embodiment, the materials of the drawing body 41 and the second handle 42 are both stainless steel 0Cr18Ni9. Two second handles 42 are provided on the drawing body 41, and each second handle 42 is arranged on the drawing body 41 at a set angle; preferably, the fourth central axis E of each second handle 42 is perpendicular to the third central axis F of the drawing body 41, and with the third central axis F of the drawing body 41 as the symmetric center line, the two second handles 42 are symmetrically arranged on the drawing body 41.

[0081] Refer to Figures 1 to 24 , in one embodiment, the first handle 22 and the second handle 42 are both handles with variable cross-sections.

[0082] Refer to Figures 1 to 24 , in one embodiment, the screw sleeve 5 has a first sleeve 51 and a second sleeve 52; the first sleeve 51 and the second sleeve 52 are integrally connected, and the outer diameter of the first sleeve 51 is smaller than the outer diameter of the second sleeve 52; the front end of the first sleeve 51 can abut against the adjusting ring 11 or the expansion ring 12. The outer diameter of the first sleeve 51 is adapted to the tube plate tube hole 821, so the first sleeve 51 can be introduced into the tube plate tube hole 821 for connection and positioning. The screw mandrel 6 passes through the screw sleeve 5, and the screw sleeve 5 has an axial guiding effect on the screw mandrel 6.

[0083] Preferably, the outer diameter of the second sleeve 52 is adapted to the inner diameter of the limit sleeve 3.

[0084] Refer to Figures 1 to 24 , in one embodiment, the material of the screw sleeve 5 is stainless steel 0Cr18Ni9.

[0085] Refer to Figures 1 to 24, in one embodiment, it further includes a first isolation washer 14, a second isolation washer 15 and a third isolation washer 16; the first isolation washer 14 is sleeved on the screw mandrel 6 and is located between the tightening device 2 and the limit sleeve 3; the second isolation washer 15 is sleeved on the screw mandrel 6 and is located between the drawing tube device 4 and the screw sleeve 5; the third isolation washer 16 is sleeved on the screw sleeve 5 and is located at the front end of the limit sleeve 3; specifically, the third isolation washer 16 is sleeved on the first sleeve 51 and is located at the front end of the second sleeve 52 and at the front end of the limit sleeve 3.

[0086] Refer to Figures 1 to 24 , in one embodiment, the material of the first isolation washer 14 is epoxy resin, which is used to isolate the tightening body 21 of the tightening device from the limit sleeve 3 and reduce the wear between the two during operation. The material of the second isolation washer 15 is epoxy resin, which is used to isolate the drawing body 41 of the drawing tube device from the screw sleeve 5 and reduce the wear between the two during operation. The material of the third isolation washer 16 is nylon PA66, which is used to isolate the "limit sleeve 3, the second sleeve 52" from the tube sheet 82 to avoid damaging the tube sheet 82 by the "limit sleeve 3, the second sleeve 52" during operation.

[0087] Refer to Figures 1 to 24 , in one embodiment, the screw mandrel 6 includes a threaded section 61, a first optical axis section 62, a second optical axis section 63 and a tail section 64 (which can be understood in combination with Figure 16 , Figure 16a and Figure 16b ); the threaded section 61, the first optical axis section 62, the second optical axis section 63 and the tail section 64 are connected in sequence; the tightening device 2 and the drawing tube device 4 are respectively threadedly connected to the threaded section 61; a ring piece 611 is provided between the threaded section 61 and the first optical axis section 62, and the diameter of the first optical axis section 62 is adapted to the inner diameter of the first sleeve 51 of the screw sleeve; the diameter of the first optical axis section 62 is greater than the diameter of the second optical axis section 63; the adjusting ring 11 and the expansion ring 12 can be sleeved on the second optical axis section 63; the diameter of the second optical axis section 63 is greater than the diameter of the tail section 64; the tail section 64 is provided with threads, and the locking member 13 can be threadedly connected to the tail section 64. Preferably, the thread specification of the threaded section 61 is M14.

[0088] Refer to Figures 1 to 24 , in one embodiment, the material of the screw mandrel 6 is stainless steel 0Cr18Ni9.

[0089] Refer to Figures 1 to 24, in one embodiment, the inner diameter of the first sleeve 51 is smaller than the inner diameter of the second sleeve 52. The threaded section 61 and the ring piece 611 can axially move in the second inner cavity 521 of the second sleeve 52. The outer diameter of the ring piece 611 is larger than the inner diameter of the first sleeve 51, so that the ring piece 611 functions to limit the threaded section 61 from entering the first inner cavity 511 of the first sleeve 51.

[0090] Refer to Figures 1 to 24 , in one embodiment, the adjusting ring 11 and the expansion ring 12 can be sleeved on the second optical axis section 63. The outer diameter of the adjusting ring 11 is the same as the outer diameter of the unexpanded expansion ring 12. Preferably, "the outer diameter of the adjusting ring 11 and the outer diameter of the unexpanded expansion ring 12" are the same as the outer diameter of the first sleeve 51 of the screw sleeve. These designs enable the expansion ring 12 to be subjected to extrusion force. Among them, the presence of the first sleeve 51 helps with the "extrusion" of the expansion ring 12. When compressing the expansion ring 12 for tightening, the first sleeve 51 functions to limit the adjusting ring 11 or the expansion ring 12 from moving toward the first side C (here, the adjusting ring and the expansion ring refer to the adjusting ring 11 or the expansion ring 12 that directly abuts against the first sleeve).

[0091] Refer to Figures 1 to 24 , in one embodiment, under the screwing action of the screwing body 21 and with the presence of the threaded section 61, the screw mandrel 6 can axially move along its own axis in sequence through "the screw sleeve 5, the second spacer washer 15, the pulling body 41, the limiting sleeve 3, the first spacer washer 14, the screwing body 21", (note: axially move (i.e., retreat) toward the " Figure 3 first side C shown"), thereby driving the locking member 13 to squeeze the adjusting ring 11, and the adjusting ring 11 then squeezes the expansion ring 12, causing the expansion ring 12 to expand radially.

[0092] Preferably, the limiting sleeve 3 and the screw sleeve 5 are tightly sleeved together.

[0093] Refer to Figures 1 to 24 , in one embodiment, the pulling body 41 is threadedly connected to the threaded section 61. The limiting sleeve 3 is sleeved on the threaded section 61. The second handle 42 is disposed on the pulling body 41 through the long circular hole 31 of the limiting sleeve. The long circular hole 31 of the limiting sleeve can limit the axial pulling displacement of the pulling tube device 4 and limit the circumferential rotation of the pulling tube device 4. The screwing body 21 is threadedly connected to the threaded section 61. During operation, rotate (such as tighten) the screwing device 2 to make the screw mandrel 6 move toward " Figure 3It moves along the first side C shown. At this time, the threaded section 61 of the screw mandrel rotates through the drawing body 41 in a threaded manner. Therefore, the drawing body 41 remains relatively stationary. At this time, the first optical axis section 62, the second optical axis section 63, and the tail section 64 of the screw mandrel will all move towards " Figure 3 the first side C shown. The tail section 64 will drive the locking member 13 to press against the adjusting ring 11 or the expansion ring 12, so that the axial length of the expansion ring 12 is compressed, and radial expansion is generated, so that the expansion ring 12 can be tightened in the tube hole 93 of the heat transfer tube 9. Then, along the axial direction of the screw mandrel 6, (towards " Figure 3 the first side C shown) pull the second handle 42. The second handle 42 drives the drawing body 41, the drawing body 41 drives the screw mandrel 6, and the screw mandrel 6 drives the heat transfer tube 9, thereby realizing drawing and guiding the tube.

[0094] Preferably, during drawing, the screw mandrel 6 axially moves (i.e., retreats) towards " Figure 3 the first side C shown. During the retreat process of the screw mandrel 6, it will not drive the screw sleeve 5 to retreat.

[0095] Referring to Figures 1 to 24 , in one embodiment, the locking member 13 includes a first circular shaft section 131 and a second circular shaft section 132. The first circular shaft section 131 and the second circular shaft section 132 are connected together. The outer diameter of the first circular shaft section 131 is greater than the outer diameter of the second circular shaft section 132; the locking member 13 has a threaded through hole 133 that penetrates the first circular shaft section 131 and the second circular shaft section 132, and the threaded through hole 133 can be threadedly connected to the tail section 64 of the screw mandrel 6. Preferably, the outer diameter of the second circular shaft section 132 is greater than "the inner diameter of the adjusting ring 11 or the inner diameter of the expansion ring 12"; preferably, the outer diameter of the first circular shaft section 131 is less than the diameter of the tube hole 93 of the heat transfer tube 9; the outer diameter of the adjusting ring 11 is less than the diameter of the tube hole 93 of the heat transfer tube 9.

[0096] Referring to Figures 1 to 24 , in one embodiment, the material of the locking member 13 is stainless steel 0Cr18Ni9.

[0097] Referring to Figures 1 to 24 , in one embodiment, a positioning device 7 is further included. The positioning device 7 includes an ear plate 71 and a positioning screw 72; a notch 32 is provided at a set position of the limit sleeve 3. The ear plate 71 is fixed on the screw sleeve 5 through the notch 32; the positioning screw 72 is detachably arranged on the ear plate 71, and the positioning screw 72 is used for penetrating into the tube plate tube hole 821 for positioning.

[0098] Reference Figures 1 to 24 Preferably, the ear plate 71 is fixedly welded to the barrel of the second sleeve 52 of the screw sleeve.

[0099] Reference Figures 1 to 24 Preferably, the ear plate 71 is provided with a fifth threaded hole 711, the positioning screw 72 has a third threaded portion 721, and the positioning screw 72 is threadedly connected to the fifth threaded hole 711 of the ear plate 71 through the third threaded portion 721.

[0100] Reference Figures 1 to 24 In one embodiment, the positioning device 7 further includes a silica gel ring 73. The silica gel ring 73 is sleeved on the positioning screw 72, which can prevent the positioning screw 72 from damaging the tube sheet 82 during operation. Preferably, a limiting ring 722 for restricting the separation of the silica gel ring 73 is provided on the positioning screw 72. Preferably, the limiting ring 722 is integrally formed with the positioning screw 72.

[0101] Another object of the present invention is to provide an operation method for a drawing heat transfer tube device to scientifically guide people to use the new drawing heat transfer tube device to draw and guide the stuck heat transfer tube.

[0102] Reference Figures 1 to 25 An operation method for a drawing heat transfer tube device, which is carried out based on the drawing heat transfer tube device 1, includes the following steps:

[0103] S1. Determine the sticking depth of the heat transfer tube 9;

[0104] S2. According to the sticking depth of the heat transfer tube 9, determine the required quantities of the adjusting ring 11 and the expansion ring 12;

[0105] S3. Adjust the positions of the adjusting ring 11 and the expansion ring 12 sleeved on the screw mandrel 6. After adjustment, install the locking member 13 on the screw mandrel 6;

[0106] S4. Adjust the position of the drawing tube device 4 so that the drawing tube device 4 abuts against the first end G of the oblong hole 31 (see the second end H of the oblong hole Figure 3 and Figure 8 shown);

[0107] S5. Introduce the screw mandrel 6 with the expansion ring 12 into the target tube hole (such as into the tube hole 93 of the heat transfer tube 9);

[0108] S6. Rotate (such as tighten) the tightening device 2 so that the expansion ring 12 expands under the extrusion pressure and is tightened in the tube hole 93 of the heat transfer tube 9;

[0109] S7. Slowly pull the drawing tube device 4 towards the first side C to move the heat transfer tube 9 towards the primary side N of the tube sheet 82;

[0110] S8. Withdraw the drawing heat transfer tube device 1 from the tube holes 821 of the tube sheet, and repeat the operations of S1 to S7 until the heat transfer tube 9 is pulled to the set position.

[0111] Preferably, in step S5, it further includes introducing the positioning screw 72 of the positioning device 7 into the set tube holes 821 of the tube sheet to achieve the positioning function.

[0112] For other contents of the drawing heat transfer tube device and operation method of the present invention, refer to the prior art and will not be elaborated here.

[0113] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Therefore, any modifications, equivalent changes, and decorations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A heat transfer tube drawing device, characterized in that: It comprises a tightening device, a limiting sleeve, a tube pulling device, a screw sleeve, a screw mandrel, a plurality of adjusting rings, a plurality of expansion rings and a locking piece; the screw sleeve is sleeved on the screw mandrel; the tube pulling device is threadedly connected to the screw mandrel and is arranged adjacent to the screw sleeve; the limiting sleeve is sleeved on the screw mandrel; the limiting sleeve is provided with an oblong hole, and the tube pulling device is arranged through the oblong hole; the tightening device is threadedly connected to the screw mandrel and is located at one end of the limiting sleeve; a plurality of the adjusting rings and a plurality of the expansion rings can be sleeved on the screw mandrel for pulling the guide tube; the front end of the screw sleeve can abut against the adjusting ring or the expansion ring; the locking piece is detachably arranged on the screw mandrel, and is used to limit the adjustment ring or the expansion ring from detaching from the screw mandrel; The tube drawing device comprises a drawing body and a second handle; the drawing body has a third threaded hole, and the drawing body is connected to the screw mandrel through the third threaded hole; the drawing body has a fourth threaded hole, and the drawing body is threadedly connected and fixed to the second handle through the fourth threaded hole, and the second handle is arranged through the oblong hole; The screw sleeve comprises a first sleeve and a second sleeve; the first sleeve is integrally connected with the second sleeve, and the outer diameter of the first sleeve is smaller than the outer diameter of the second sleeve; the front end of the first sleeve can abut against the adjusting ring or the expansion ring; The screw core shaft includes a threaded section, a first optical axis section, a second optical axis section and a tail section; the threaded section, the first optical axis section, the second optical axis section and the tail section are connected in sequence; the tightening device and the tube drawing device are threadedly connected to the threaded section respectively; a ring sheet is provided between the threaded section and the first optical axis section, and the diameter of the first optical axis section is adapted to the inner diameter of the first sleeve of the screw sleeve; the diameter of the first optical axis section is larger than the diameter of the second optical axis section; the adjusting ring and the expansion ring can be sleeved on the second optical axis section; the diameter of the second optical axis section is larger than the diameter of the tail section; the tail section is provided with threads, and the locking piece can be threadedly connected to the tail section.

2. The heat transfer tube drawing device according to claim 1, characterized in that: The tightening device includes a tightening body and a first handle; the tightening body has a first threaded hole, and the tightening body is connected to the screw core shaft through the first threaded hole; the tightening body has a second threaded hole, and the tightening body is connected to the first handle through the second threaded hole.

3. The heat transfer tube drawing device according to claim 1, characterized in that: It also includes a first isolation washer, a second isolation washer and a third isolation washer; the first isolation washer is sleeved on the screw core shaft and is located between the tightening device and the limiting sleeve; the second isolation washer is sleeved on the screw core shaft and is located between the tube drawing device and the screw sleeve; the third isolation washer is sleeved on the screw sleeve and is located at the front end of the limiting sleeve.

4. The heat transfer tube drawing device according to claim 1, characterized in that: The locking member includes a first circular shaft segment and a second circular shaft segment, the first circular shaft segment and the second circular shaft segment are connected together, and the outer diameter of the first circular shaft segment is larger than the outer diameter of the second circular shaft segment; the locking member has a threaded through hole, the threaded through hole passes through the first circular shaft segment and the second circular shaft segment, and the threaded through hole can be threadedly connected to the screw core shaft.

5. The heat transfer tube drawing device according to any one of claims 1 to 4, characterized in that: It also includes a positioning device, which includes an ear plate and a positioning screw; a notch is opened at the setting position of the limit sleeve, and the ear plate is fixed on the screw sleeve through the notch; the positioning screw is detachably arranged on the ear plate, and the positioning screw is used to penetrate into the tube hole of the tube plate for positioning.

6. The heat transfer tube drawing device according to claim 5, characterized in that: The positioning device also includes a silicone ring, and the silicone ring is sleeved on the positioning screw.

7. A method for operating a heat transfer tube drawing device, which is based on the heat transfer tube drawing device according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. Determine the jamming depth of the heat transfer tube; S2. Determine the required number of the adjusting ring and the expansion ring according to the jamming depth of the heat transfer tube; S3, adjusting the positions of the adjusting ring and the expansion ring sleeve on the screw mandrel, and after the adjustments are completed, installing the locking member on the screw mandrel; S4, adjusting the position of the tube-drawing device so that the tube-drawing device is close to the first end of the oblong hole; S5, introducing the screw mandrel with the expansion ring into the target pipe hole; S6, rotating the tightening device to cause the expansion ring to expand due to the extrusion force and be tightened in the tube hole of the heat transfer tube; S7, slowly pulling the tube drawing device toward the first side, pulling the heat transfer tube toward the primary side of the tube sheet.

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