Drawing heat transfer tube device and operation method

Abstract

The invention discloses a heat transfer tube drawing device and an operation method. The heat transfer tube drawing device comprises 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 piece. The screw mandrel is sleeved with the screw sleeve. The pipe drawing device is in threaded connection with the screw mandrel and is arranged adjacent to the screw sleeve; the limiting sleeve is arranged on the screw mandrel in a sleeving manner; the limiting sleeve is provided with an oblong hole, and the pipe drawing device penetrates through the oblong hole. The tightening device is in threaded connection with the screw mandrel and is positioned at one end of the limiting sleeve; the adjusting rings and the expansion rings can be arranged on the screw mandrel in a sleeving manner and are used for drawing the guide pipe; 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 used for limiting the adjusting ring or the expansion ring from being separated from the screw mandrel. According to the invention, the heat transfer tube can be drawn and led, and the problem that the heat transfer tube of the nuclear power steam generator cannot be normally penetrated when being jammed when being penetrated into a tube plate at present can be solved.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear power, and in particular relates to a heat transfer tube drawing device and an operating method. Background Art

[0002] The structure of a typical nuclear power steam generator 8-tube bundle assembly is shown in the attached Figure 25 As shown, its length exceeds 10 meters, and it is provided with several layers of heat transfer tube support plates 81. The heat transfer tube 9 has a U-shaped structure. The main installation process requirements for its tube threading are as follows: (1) U-shaped heat transfer tube 9 Figure 25 The end of the tapered cylinder 83 on the second side D is penetrated by a tube; (2) The two legs 91 of the U-shaped heat transfer tube 9 pass through the support plate 81 layer by layer synchronously and then enter the tube holes of the tube plate 82.

[0003] Under normal pipe threading conditions, pipe threading operators apply appropriate thrust to the heat transfer tube 9 at the end of the tapered cylinder 83, allowing it to smoothly reach its installation location. However, due to a certain probability of deviation (design accuracy tolerance) in the machining of the tube holes in the support plate 81 and the tube sheet 82, especially when the cumulative deviation of tube holes in the same position approaches or reaches the upper tolerance limit, the heat transfer tube may become stuck despite its certain flexibility. Simply applying thrust to the heat transfer tube at the bend 92 (located at the end of the tapered cylinder 83) will not allow the heat transfer tube to reach the intended location. For every nuclear power steam generator (some with over 10,000 tube sheet holes), encountering such a stuck heat transfer tube during threading is a complex problem to resolve.

[0004] Reference Figure 25 The tube hole depth K of the tube sheet is between 600mm and 800mm. The branch leg 91 of the heat transfer tube 9 enters the tube hole of the tube sheet 82. The gap between the heat transfer tube and the tube hole of the tube sheet is small. The slight deflection generated during the insertion of the heat transfer tube can easily cause the heat transfer tube to be stuck in the tube hole of the tube sheet. Once the heat transfer tube is stuck, it is difficult to push the heat transfer tube further by applying a thrust at the bend section 92. The secondary side M of the tube sheet 82 is inaccessible to the staff. The tube hole of the primary side N is the only access. However, the tube hole of the tube sheet has a small diameter and a large depth, and is inaccessible to conventional tools. Therefore, it is currently necessary to develop a special tool to pull and guide the tube from the primary side of the tube sheet. As can be seen from the above, there is currently a lack of a heat transfer tube pulling and guiding device to solve the problem of nuclear power steam generator heat transfer tubes becoming stuck and unable to be properly inserted into the tube sheet. Currently, there is also a lack of a heat transfer tube pulling and guiding device operation method to scientifically guide people to use the new heat transfer tube pulling and guiding device to pull and guide stuck heat transfer tubes.

[0005] Therefore, a new technology is needed to solve the problem that the existing technology lacks a device for drawing a heat transfer tube; a new technology is needed to solve the problem that the existing technology lacks an operating method for drawing a heat transfer tube. Summary of the Invention

[0006] In order to solve the above problems in the prior art, the present invention provides a heat transfer tube pulling device, which can pull the guide tube and solve the problem that the heat transfer tube of the nuclear power steam generator cannot be normally inserted into the tube plate due to jamming.

[0007] The present invention adopts the following technical solutions: A heat transfer tube pulling device, comprising a tightening device, a limiting sleeve, a tube pulling device, a screw sleeve, a screw core shaft, several adjusting rings, several expansion rings and a locking piece; the screw sleeve is sleeved on the screw core shaft; the tube pulling device is threadedly connected to the screw core shaft and is arranged adjacent to the screw sleeve; the limiting sleeve is sleeved on the screw core shaft; 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 core shaft and is located at one end of the limiting sleeve; several adjusting rings and several expansion rings can be sleeved on the screw core shaft 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 provided on the screw core shaft, for limiting the adjustment ring or the expansion ring from detaching from the screw core shaft.

[0008] Furthermore, 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.

[0009] Furthermore, the tube drawing 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 core shaft 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.

[0010] Furthermore, the screw sleeve has a first sleeve and a second sleeve; the first sleeve is integrally connected to 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 adjustment ring or the expansion ring.

[0011] Furthermore, 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.

[0012] Furthermore, 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 respectively threadedly connected to the threaded section; 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.

[0013] Furthermore, 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.

[0014] Furthermore, 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.

[0015] Furthermore, the positioning device also includes a silicone ring, and the silicone ring is sleeved on the positioning screw.

[0016] Another object of the present invention is to provide an operating method for a heat transfer tube pulling device to scientifically guide people to use the new heat transfer tube pulling device to pull and guide stuck heat transfer tubes.

[0017] A method for operating a heat transfer tube drawing device is provided, which is based on the heat transfer tube drawing device and comprises the following steps: S1. Determine the jamming depth of the heat transfer tube; S2. Determine the required number of the adjustment rings and the expansion rings 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 core shaft, and after the adjustments are completed, installing the locking member on the screw core shaft; S4. Adjust 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 core shaft with the expansion ring into the target pipe hole; S6. Rotate the tightening device to expand the expansion ring due to the extrusion force and tighten it in the tube hole of the heat transfer tube; S7. Slowly pull the tube drawing device toward the first side, pulling the heat transfer tube toward the primary side of the tube sheet.

[0018] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a heat transfer tube drawing device. The expansion ring on the screw mandrel is forced to expand and tighten within the tube hole of the heat transfer tube, establishing a connection between the screw mandrel and the heat transfer tube. This allows the screw mandrel to pull the heat transfer tube, achieving tube drawing and guiding. This device can address the current problem of heat transfer tubes in nuclear power steam generators becoming stuck when entering the tube sheet.

[0019] In the manufacture of tube bundles for heat exchangers such as nuclear steam generators, when a heat transfer tube is stuck and cannot reach the set tube threading position, it is often required to withdraw the tube. There are two major disadvantages to withdrawing the tube: first, there is a high probability that the withdrawn heat transfer tube will have visible scratches on its surface, which will not allow it to be reused and will be scrapped; second, there is a risk that large foreign matter will fall into the inaccessible area inside the tube bundle during the withdrawal operation. The emergence of the present invention effectively avoids the withdrawal of heat transfer tubes. The heat transfer tube drawing device of the present invention can handle "heat transfer tubes that are stuck and cannot be threaded normally" at the primary side of the tube plate, avoiding the scrapping of heat transfer tubes and the corresponding withdrawal risks, reducing the manufacturing cost of nuclear steam generators, and improving the manufacturing efficiency of nuclear steam generators.

[0020] The present invention provides an operating method for a drawing heat transfer tube device, which is specially designed for a new drawing heat transfer tube device. It can scientifically guide people to use the new drawing heat transfer tube device to draw and guide stuck heat transfer tubes, effectively avoiding damage to mechanical components caused by incorrect operation due to insufficient knowledge of the new drawing heat transfer tube device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The technology of the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments: Figure 1 This is a front view of the heat transfer tube drawing device of the present invention; Figure 2 It is a three-dimensional schematic diagram of the heat transfer tube drawing device of the present invention; Figure 3Schematic diagram of the heat transfer tube drawing device of the present invention being introduced into the tube hole of the tube sheet for drawing and guiding the heat transfer tube; Figure 4 yes Figure 3 A local enlarged view at Q; Figure 5 It is a three-dimensional schematic diagram of the tightening body of the present invention; Figure 6 It is a three-dimensional schematic diagram of the first handle of the present invention; Figure 7 is a perspective schematic diagram of a first isolation gasket of the present invention; Figure 8 is a three-dimensional schematic diagram of the limiting sleeve of the present invention from a first viewing angle; Figure 9 is a perspective schematic diagram of the limiting sleeve of the present invention from a second viewing angle; Figure 10 It is a three-dimensional schematic diagram of the drawn body of the present invention; Figure 11 is a perspective schematic diagram of the second handle of the present invention; Figure 12 is a perspective schematic diagram of a second isolation gasket of the present invention; Figure 13 It is a three-dimensional schematic diagram of the screw sleeve of the present invention from a first viewing angle; Figure 14 is a perspective schematic diagram of the screw sleeve of the present invention from a second viewing angle; Figure 15 is a perspective schematic diagram of a third isolation gasket of the present invention; Figure 16 It is a three-dimensional schematic diagram of the screw core shaft of the present invention; Figure 16a It is a partial enlarged view of the screw core shaft of the present invention (showing the thread segment, ring segment, first optical axis segment, and second optical axis segment); Figure 16b It is a partial enlarged view of the screw core shaft of the present invention (showing the second optical axis section and the tail section); Figure 17 It is a three-dimensional schematic diagram of the adjustment ring of the present invention; Figure 18 It is a three-dimensional schematic diagram of the expansion ring of the present invention; Figure 19 is a perspective schematic diagram of the locking member of the present invention from a first viewing angle; Figure 20 is a perspective schematic diagram of the locking member of the present invention from a second viewing angle; Figure 21 It is a three-dimensional schematic diagram of the positioning device of the present invention; Figure 22 yes Figure 21 Schematic diagram of the middle ear plate; Figure 23 yes Figure 21 A three-dimensional schematic diagram of the positioning screw; Figure 24 yes Figure 21 Schematic diagram of the middle silicone ring; Figure 25 It is a plan view of the nuclear power steam generator of the present invention.

[0022] Reference numerals: 1-heat transfer tube pulling device; 11-adjusting ring; 12-expansion ring; 13-locking member; 131-first circular shaft segment; 132-second circular shaft segment; 133-threaded through hole; 14-first isolation washer; 15-second isolation washer; 16-third isolation washer; C-first side; D-second side; 2-tightening device; 21-tightening body; B-first central axis; 211-first threaded hole; 212-second threaded hole; 213-beveled surface; 22-first handle; 221-first threaded portion; A-second central axis; P-included angle; 3-limiting sleeve; 31-long round hole; G-first end; H-second end; 32-notch; 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; 5-screw sleeve; 51-first sleeve; 511-first inner cavity; 52-second sleeve; 521-second inner cavity; 6-screw core shaft; 61-thread segment; 611-ring piece; 62-first optical axis segment; 63-second optical axis segment; 64-tail segment; 7-positioning device; 71-ear plate; 711-fifth threaded hole; 72-positioning screw; 721-third threaded portion; 722-limiting ring; 73-silicone ring; 8-nuclear steam generator; 81-support plate; 82-tube sheet; 821-tube sheet hole; 83-conical cylinder; K-depth; M-secondary side; N-primary side; Q-partial enlarged drawing number; 9-heat transfer tube; 91-branch leg; 92-elbow section; 93-tube hole. DETAILED DESCRIPTION

[0023] The following will be combined with the embodiments and drawings to clearly and completely describe the concept, specific structure and technical effects of the present invention so as to fully understand the purpose, scheme and effect of the present invention. It should be noted that the embodiments and features in the embodiments of this application can be combined with each other unless there is a conflict. The same reference numerals used throughout the drawings indicate the same or similar parts.

[0024] It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it may be directly fixed or connected to the other feature or indirectly fixed or connected to the other feature. Furthermore, terms such as "upper," "lower," "left," and "right" used in this disclosure are intended solely to describe the relative positions of the components of the disclosure as shown in the accompanying drawings.

[0025] Reference Figures 1 to 24 A heat transfer tube drawing device 1 includes a tightening device 2, a limiting sleeve 3, a tube drawing device 4, a screw sleeve 5, a screw core shaft 6, a plurality of adjustment rings 11, a plurality of expansion rings 12 and a locking member 13; the screw sleeve 5 is sleeved on the screw core shaft 6; the tube drawing device 4 is threadedly connected to the screw core shaft 6 and is arranged adjacent to the screw sleeve 5; the limiting sleeve 3 is sleeved on the screw core shaft 6; the limiting sleeve 3 is provided with an oblong hole 31, and the tube drawing device 4 passes through The oblong hole 31 is provided; the tightening device 2 is threadedly connected to the screw core shaft 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 core shaft 6 for pulling 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 core shaft 6 for limiting the adjustment ring 11 or the expansion ring 12 from detaching from the screw core shaft 6.

[0026] Reference Figures 1 to 24 In one embodiment, the adjustment ring 11 is a rigid adjustment ring made of stainless steel 0Cr18Ni9. It can be used to squeeze the expansion ring 12. Depending on the depth at which the heat transfer tube 9 is stuck in the tube sheet hole 821, an appropriate number of adjustment rings 11 can be selected and placed on the screw mandrel 6. By adjusting the number of adjustment rings 11, the expansion ring 12 is squeezed and expanded within the tube sheet hole 821 at a set depth, establishing a connection between the screw mandrel 6 and the heat transfer tube 9. This allows the heat transfer tube 9 stuck at different depths in the tube sheet hole to be effectively pulled out.

[0027] Reference Figures 1 to 24 In one embodiment, the expansion ring 12 is made of silicone with a Shore hardness of 65 to 75. A plurality of expansion rings 12 can be mounted on the screw core shaft 6. Therefore, a suitable number of expansion rings 12 can be selected based on the different depths of the heat transfer tube 9 stuck in the tube hole 821 of the tube sheet, and combined with the number of adjustment rings 11, so that all expansion rings 12 can enter the tube hole 93 of the leg 91 of the heat transfer tube 9. Thereafter, by rotating (e.g., tightening) the tightening device 2, the screw core shaft 6 is moved " Figure 3The screw core shaft 6 moves along the first side C", so that the screw core shaft 6 and the locking member 13 squeeze the adjusting ring 11, thereby allowing the adjusting ring 11 to compress the axial length of the expansion ring 12, allowing the expansion ring 12 to expand radially, thereby achieving the purpose of expanding and connecting the heat transfer tube 9. At the same time, the expansion ring 12 can effectively improve the deflection of the heat transfer tube 9 during the process of expanding and tightening the heat transfer tube 9, thereby improving the jamming condition of the heat transfer tube 9.

[0028] Reference Figures 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.

[0029] Reference Figures 1 to 24 In one embodiment, the tightening body 21 and the first handle 22 are both made of stainless steel 0Cr18Ni9; the tightening body 21 is provided with a plurality of evenly arranged first handles 22, preferably, the tightening body 21 is provided with two first handles 22, the two first handles 22 are arranged on the tightening body 21 at an inclined setting angle, and the second center axis A of each first handle 22 forms a plane angle P of 60° with the first center axis B of the tightening body 21; with the first center axis B of the tightening body 21 as the center line of symmetry, the two first handles 22 are symmetrically arranged on the tightening body 21. The tightening body 21 can be rotated (e.g., tightened) by the first handle 22, so that the screw core shaft 6 can be moved " Figure 3 As shown, the first side C" moves, reducing the length of the screw core shaft 6 on the second side D, thereby driving the locking member 13. The locking member 13 squeezes the adjusting ring 11, and the adjusting ring 11 squeezes 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 expansion and connection of the heat transfer tube 9, thereby establishing the connection between the screw core shaft 6 and the heat transfer tube 9, and then pulling the tube drawing device 4 to achieve the drawing and guiding of the heat transfer tube 9.

[0030] Reference Figures 1 to 24 Preferably, in order to better achieve the installation of the first handle 22, the tightening body 21 is provided with a bevel surface 213, and the bevel surface 213 forms a set angle with the first center axis B of the tightening body 21. Specifically, if the direction in which the first center axis B of the tightening body extends toward the second side D is defined as the positive direction, the bevel surface 213 forms an angle of 30° with the positive direction of the first center axis B of the tightening body 21.

[0031] Reference Figures 1 to 24 In one embodiment, the tube drawing 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 core shaft 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 is arranged through the oblong hole 31.

[0032] Reference Figures 1 to 24 In one embodiment, the drawn body 41 and the second handle 42 are both made of stainless steel 0Cr18Ni9. Two second handles 42 are provided on the drawn body 41, each second handle 42 being positioned at a predetermined angle. Preferably, the fourth central axis E of each second handle 42 is perpendicular to the third central axis F of the drawn body 41, and the two second handles 42 are symmetrically positioned on the drawn body 41, with the third central axis F of the drawn body 41 serving as the centerline of symmetry.

[0033] Reference Figures 1 to 24 In one embodiment, the first handle 22 and the second handle 42 are both handles with variable cross-sections.

[0034] Reference Figures 1 to 24 In one embodiment, the screw sleeve 5 comprises 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 that of the second sleeve 52. The front end of the first sleeve 51 can abut against the adjustment ring 11 or the expansion ring 12. The outer diameter of the first sleeve 51 matches the tube sheet hole 821, so the first sleeve 51 can be inserted into the tube sheet hole 821 for connection and positioning. The screw core shaft 6 passes through the screw sleeve 5, which serves as an axial guide for the screw core shaft 6.

[0035] Preferably, the outer diameter of the second sleeve 52 is adapted to the inner diameter of the limiting sleeve 3 .

[0036] Reference Figures 1 to 24 In one embodiment, the material of the screw sleeve 5 is stainless steel 0Cr18Ni9.

[0037] Reference Figures 1 to 24In one embodiment, it also 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 core shaft 6 and is located between the tightening device 2 and the limiting sleeve 3; the second isolation washer 15 is sleeved on the screw core shaft 6 and is located between the tube drawing 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 limiting 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 is located at the front end of the limiting sleeve 3.

[0038] Reference Figures 1 to 24 In one embodiment, the first isolation washer 14 is made of epoxy resin and is used to isolate the tightening body 21 of the tightening device from the limiting sleeve 3, reducing wear between the two during operation. The second isolation washer 15 is made of epoxy resin and is used to isolate the drawing body 41 of the tube drawing device from the screw sleeve 5, reducing wear between the two during operation. The third isolation washer 16 is made of nylon PA66 and is used to isolate the limiting sleeve 3, the second sleeve 52 and the tube sheet 82, preventing the limiting sleeve 3 and the second sleeve 52 from damaging the tube sheet 82 during operation.

[0039] Reference Figures 1 to 24 In one embodiment, the screw core shaft 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 combined Figure 16 、 Figure 16a and Figure 16b The threaded segment 61, the first optical axis segment 62, the second optical axis segment 63, and the tail segment 64 are connected in sequence; the tightening device 2 and the tube drawing device 4 are respectively threadedly connected to the threaded segment 61; a ring piece 611 is provided between the threaded segment 61 and the first optical axis segment 62; the diameter of the first optical axis segment 62 is adapted to the inner diameter of the first sleeve 51 of the screw sleeve; the diameter of the first optical axis segment 62 is larger than the diameter of the second optical axis segment 63; the adjustment ring 11 and the expansion ring 12 can be sleeved on the second optical axis segment 63; the diameter of the second optical axis segment 63 is larger than the diameter of the tail segment 64; the tail segment 64 is provided with threads, and the locking member 13 can be threadedly connected to the tail segment 64. Preferably, the thread specification of the threaded segment 61 is M14.

[0040] Reference Figures 1 to 24 In one embodiment, the material of the screw core shaft 6 is stainless steel 0Cr18Ni9.

[0041] Reference Figures 1 to 24In one embodiment, the inner diameter of the first sleeve 51 is smaller than the inner diameter of the second sleeve 52, and the threaded segment 61 and the ring piece 611 can move axially 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 plays a role in limiting the threaded segment 61 from entering the first inner cavity 511 of the first sleeve 51.

[0042] Reference Figures 1 to 24 In one embodiment, the adjustment ring 11 and the expansion ring 12 can be sleeved on the second optical axis segment 63, and the outer diameter of the adjustment ring 11 is the same as the outer diameter of the unexpanded expansion ring 12; preferably, "the outer diameter of the adjustment 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 allow the expansion ring 12 to be subjected to extrusion force. Among them, the presence of the first sleeve 51 helps the expansion ring 12 in "extrusion". When the expansion ring 12 is compressed for tightening, the first sleeve 51 serves to limit the movement of the adjustment ring 11 or the expansion ring 12 toward the first side C (the adjustment ring and expansion ring here refer to the adjustment ring 11 or the expansion ring 12 that is directly in contact with the first sleeve).

[0043] Reference Figures 1 to 24 In one embodiment, under the tightening action of the tightening body 21 and the presence of the threaded segment 61, the screw core shaft 6 can move axially along its own axial direction, sequentially passing through "the screw sleeve 5, the second isolation washer 15, the drawing body 41, the limiting sleeve 3, the first isolation washer 14, and the tightening body 21" (Note: to " Figure 3 The first side C″ shown in the figure moves axially (ie retreats), thereby driving the locking member 13 to squeeze the adjusting ring 11, and the adjusting ring 11 squeezes the expansion ring 12, causing the expansion ring 12 to expand radially.

[0044] Preferably, the limiting sleeve 3 and the screw sleeve 5 are tightly fitted together.

[0045] Reference Figures 1 to 24 In one embodiment, the drawing body 41 is threadedly connected to the threaded segment 61, the limiting sleeve 3 is sleeved on the threaded segment 61, and the second handle 42 is arranged on the drawing body 41 through the oblong hole 31 of the limiting sleeve. The oblong hole 31 of the limiting sleeve can limit the axial pulling displacement and circumferential rotation of the drawing tube device 4, and the tightening body 21 is threadedly connected to the threaded segment 61. During operation, the tightening device 2 is rotated (e.g., tightened) to move the screw core shaft 6 toward the " Figure 3As shown in the first side C", the threaded section 61 of the screw core shaft is "threadedly rotated" through the pulling body 41, so the pulling body 41 remains relatively motionless. At this time, the "first optical axis section 62, the second optical axis section 63 and the tail section 64" of the screw core shaft will all move toward the " Figure 3 As shown in the first side C", the tail section 64 will bring the locking member 13 to squeeze the adjusting ring 11 or the expansion ring 12, so that the axial length of the expansion ring 12 is squeezed and radial expansion occurs, thereby allowing the expansion ring 12 to expand tightly in the tube hole 93 of the heat transfer tube 9. Afterwards, along the axial direction of the screw core shaft 6 (towards the " Figure 3 The first side C") is shown in FIG. 2 ) and the second handle 42 is pulled, the second handle 42 drives the pulling body 41, the pulling body 41 drives the screw core shaft 6, and the screw core shaft 6 drives the heat transfer tube 9, thereby pulling the guide tube.

[0046] Preferably, during the drawing, the screw core shaft 6 moves to the " Figure 3 As shown, the first side C" moves axially (i.e., retreats), and the screw core shaft 6 does not drive the screw sleeve 5 to retreat during the retreat process.

[0047] Reference Figures 1 to 24 In one embodiment, the locking member 13 includes a first circular shaft segment 131 and a second circular shaft segment 132. The first and second circular shaft segments 131 and 132 are connected together, and the outer diameter of the first circular shaft segment 131 is larger than the outer diameter of the second circular shaft segment 132. The locking member 13 has a threaded through-hole 133 that passes through the first and second circular shaft segments 131 and 132 and can be threadedly connected to the tail segment 64 of the screw core shaft 6. Preferably, the outer diameter of the second circular shaft segment 132 is larger than the inner diameter of the adjustment ring 11 or the inner diameter of the expansion ring 12. Preferably, the outer diameter of the first circular shaft segment 131 is smaller than the diameter of the tube hole 93 of the heat transfer tube 9; and the outer diameter of the adjustment ring 11 is smaller than the diameter of the tube hole 93 of the heat transfer tube 9.

[0048] Reference Figures 1 to 24 In one embodiment, the locking member 13 is made of stainless steel 0Cr18Ni9.

[0049] Reference Figures 1 to 24 In one embodiment, it further includes a positioning device 7, which includes an ear plate 71 and a positioning screw 72; a notch 32 is opened at the set position of the limiting sleeve 3, and 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 to penetrate into the tube hole 821 of the tube sheet for positioning.

[0050] Reference Figures 1 to 24 Preferably, the ear plate 71 is welded and fixed to the barrel of the second sleeve 52 of the screw sleeve.

[0051] 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 .

[0052] Reference Figures 1 to 24 In one embodiment, the positioning device 7 further includes a silicone ring 73, which is sleeved onto the positioning screw 72 to prevent the positioning screw 72 from damaging the tube sheet 82 during operation. Preferably, a limiting ring 722 is provided on the positioning screw 72 to prevent the silicone ring 73 from detaching. Preferably, the limiting ring 722 is integrally formed with the positioning screw 72.

[0053] Another object of the present invention is to provide an operating method for a heat transfer tube pulling device to scientifically guide people to use the new heat transfer tube pulling device to pull and guide stuck heat transfer tubes.

[0054] Reference Figures 1 to 25 A method for operating a heat transfer tube drawing device is provided, which is based on the heat transfer tube drawing device 1 and includes the following steps: S1. Determine the jamming depth of the heat transfer tube 9; S2. Determine the required number of the adjustment rings 11 and the expansion rings 12 according to the jamming depth of the heat transfer tube 9; S3, adjusting the position of the adjusting ring 11 and the expansion ring 12 on the screw core shaft 6, and after the adjustment, installing the locking member 13 on the screw core shaft 6; S4, adjust the position of the tube drawing device 4 so that the tube drawing device 4 is close to the first end G of the oblong hole 31 (the second end H of the oblong hole is shown in FIG. Figure 3 and Figure 8 shown); S5. Introducing the screw core shaft 6 with the expansion ring 12 into the target tube hole (e.g., into the tube hole 93 of the heat transfer tube 9); S6. Rotate (e.g., tighten) the tightening device 2 so that the expansion ring 12 expands due to the extrusion force and is tightened in the tube hole 93 of the heat transfer tube 9; S7, slowly pulling the tube drawing device 4 toward the first side C, pulling the heat transfer tube 9 toward the primary side surface N of the tube sheet 82; S8. Remove the heat transfer tube pulling device 1 from the tube hole 821 of the tube sheet, and repeat the operations S1 to S7 until the heat transfer tube 9 is pulled to the set position.

[0055] Preferably, in step S5, the positioning screw 72 of the positioning device 7 is also introduced into the set tube hole 821 of the tube sheet to achieve the positioning effect.

[0056] The other contents of the heat transfer tube drawing device and operation method described in the present invention can be found in the prior art and will not be repeated here.

[0057] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Therefore, any modifications, equivalent changes, and modifications 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 shall 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 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: The tube drawing 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 core shaft 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.

4. The heat transfer tube drawing device according to claim 1, characterized in that: 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 adjustment ring or the expansion ring.

5. 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.

6. 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.

7. The heat transfer tube drawing device according to any one of claims 1 to 6, 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.

8. The heat transfer tube drawing device according to claim 7, characterized in that: The positioning device also includes a silicone ring, and the silicone ring is sleeved on the positioning screw.

9. 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 8, 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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