Device for removing fractured tapered threaded section from heat exchange tube, and operating method

Abstract

A device for removing a fractured tapered threaded section from a heat exchange tube, and an operating method, which relate to the field of heat exchanger maintenance, with a view to solving the technical problem of a tapered threaded section fractured in a heat exchange tube being unable to be effectively removed by using an electric hand drill for drilling or by mounting a wire extractor or by carrying out a reverse strike. A plate electrode (4) of the device is mounted on an electrical discharge machine gun head (1); electric corrosion is carried out on the tapered threaded section by means of the plate electrode (4) to form a notch; and a water output end of a water injection pipe (5) is arranged close to the front end of the plate electrode (4). The method is implemented using the following steps: step 1, fixing the electric discharge machine gun head (1) on a tube plate; step 2, selecting the plate electrode (4) to be made of a brass material; step 3, clamping and fastening the plate electrode (4) onto an electric discharge machine clamp (3); step 4, injecting tap water while starting the electric discharge machine gun head (1), and creating a straight notch on the side of the tapered threaded section close to a tube wall by means of repeated advancing and retreating of the plate electrode (4); and step 5, after the straight notch penetrates the tapered threaded section, unscrewing and removing the tapered threaded section.

Description

Device and operating method for taking out broken conical thread section in heat exchange tube TECHNICAL FIELD

[0001] The present application relates to a device and operating method for taking out a broken conical thread section in a heat exchange tube, in particular to a device and operating method for taking out a broken conical thread section in a heat exchange tube, and belongs to the field of heat exchanger maintenance. BACKGROUND

[0002] During installation, the straight tube heat exchanger often needs to carry out pipe pulling and replacement work on the φ16*1.4BFe30 heat exchange tube. For the pipe pulling work, a special conical thread pull head is used, the conical thread on the pull head is screwed with the heat exchange tube through external force, and then the pull head is pulled out of the heat exchange tube through the action of hydraulic pressure. Due to the influence of factors such as the material of the conical thread pull head, the combination force of the heat exchange tube and the tube plate, and the actual operation, the problem of conical thread pull head fracture occasionally occurs.

[0003] For the case that the conical thread section is broken in the heat exchange tube, the conical thread section is usually drilled by a hand drill, a wire taking device is installed, or the conical thread section is loosened by reverse beating. However, due to the high hardness and strong elasticity of the material of the conical thread section (spring steel 60Si2Mn), there is a large thread engagement force between the conical thread section and the heat exchange tube, and due to the small inner diameter of the heat exchange tube, the deep position of the conical thread section, and the limited operation space, the broken conical thread section in the heat exchange tube cannot be taken out, which affects the subsequent work. SUMMARY

[0004] The purpose of the present application is to solve the problem that the conical thread pull head of the straight tube heat exchanger is broken, and the conical thread section is drilled by a hand drill or a wire taking device is installed, or the conical thread section is loosened by reverse beating, which cannot effectively take out the broken conical thread section in the heat exchange tube, and affects the normal progress of the subsequent work, and to provide a device and operating method for taking out a broken conical thread section in a heat exchange tube.

[0005] The technical solution adopted by the present application to solve the above problems is:

[0006] A device for taking out a broken conical thread section in a heat exchange tube, comprising a cutting device and a water injection pipe; the cutting device comprises an electric spark gun head and a plate-shaped electrode; the plate-shaped electrode is installed on the electric spark gun head, and the electric spark gun head is used to electrically etch a notch on the conical thread section; the water outlet end of the water injection pipe is arranged close to the front end of the plate-shaped electrode.

[0007] Further, the cutting device further comprises a magnetic support for the head and an electric spark gun clamp; the electric spark gun head is installed on the tube plate through the magnetic support for the head, the electric spark gun clamp is installed at the front end of the electric spark gun head, and the plate-shaped electrode is installed on the electric spark gun clamp.

[0008] Further, the plate-shaped electrode is made of brass material, and the thickness of the plate-shaped electrode is 2 mm.

[0009] An operating method of a device for taking out a broken conical thread segment in a heat exchange pipe, the method is realized according to the following steps:

[0010] Step one: the electric spark gun head is fixed on the tube plate through the magnetic support of the machine head;

[0011] Step two: select a 2mm thick plate-shaped electrode made of brass material as the electrode material for opening a slit-shaped notch;

[0012] Step three: clamp the plate-shaped electrode to the electric spark machine clamp mouth and tighten, adjust the position of the electric spark gun head to confirm the position of the plate-shaped electrode, and make the plate-shaped electrode located in the center of the pipe;

[0013] Step four: inject tap water into the water injection pipe and start the electric spark gun head at the same time, and repeatedly advance and retreat through the plate-shaped electrode to punch out a slit-shaped notch on the side close to the pipe wall, and the eroded powder is taken out of the pipe by the flowing water to avoid accumulation and affect the normal work of the plate-shaped brass electrode;

[0014] Step five: when the slit-shaped notch penetrates the conical thread segment, the engagement force between the conical thread segment and the BFe30 heat exchange pipe is released, and the loosened conical thread segment is loosened and taken out.

[0015] Further, after the slit-shaped notch penetrates the conical thread segment in step five, the loosened conical thread segment is loosened and taken out by using a flat head screwdriver with a wrench.

[0016] The beneficial effects of the present application are:

[0017] First, the present application opens a slit-shaped notch on the conical thread segment by means of electric spark high-temperature melting and erosion, releases the engagement force between the conical thread segment and the inner wall of the heat exchange pipe, and then uses a flat head screwdriver with a wrench to loosen and take out the loosened conical thread segment, which ensures the orderly progress of subsequent work and reduces the damage to the hole in the tube plate bottom.

[0018] Second, by using the process method of electric spark erosion, a slit-shaped notch is punched on the conical thread segment, and when the thread engagement depth is exceeded, the binding force between the conical thread segment and the heat exchange pipe is released, and then other simple flat tools such as screwdrivers are used to rotate and loosen until the conical thread segment is taken out. This method solves the problem that the conventional method cannot take out the conical thread segment which is left in the small diameter heat exchange pipe and is located deep, and the practical effect is good. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 is a schematic diagram of a straight pipe type double tube plate heat exchanger.

[0020] Figure 2 is a schematic diagram of the tapered thread segment before breaking.

[0021] Figure 3 is a schematic diagram of the tapered thread segment after breaking.

[0022] Figure 4 is a physical diagram of the end face of the deep hole threaded tapered segment.

[0023] Figure 5 is a physical diagram of the deep hole threaded tapered segment with the notch removed.

[0024] Figure 6 is a physical diagram of the removed deep hole threaded tapered segment.

[0025] Figure 7 is a schematic diagram of the installation of the present application on a tube plate.

[0026] Figure 8 is a schematic diagram of the overall structure of the present application.

[0027] Figure 9 is a structural diagram of the plate-shaped electrode 4.

[0028] Figure 10 is a physical diagram of the tool for preparing the opening by removing the tapered thread segment. DETAILED DESCRIPTION

[0029] Specific embodiment one: in combination with Figures 7-9, the present embodiment describes a device for removing a broken tapered thread segment in a heat exchange tube, which includes cutting equipment and a water injection pipe 5; the cutting equipment includes an electric spark machine gun head 1 and a plate-shaped electrode 4; the plate-shaped electrode 4 is installed on the electric spark machine gun head 1, and an electric erosion notch is made on the tapered thread segment through the plate-shaped electrode 4; the water outlet end of the water injection pipe 5 is arranged close to the front end of the plate-shaped electrode 4.

[0030] Electric spark machining is based on the high-temperature melting of the workpiece surface material generated by the transient spark discharge between the tool electrode and the workpiece electrode to achieve machining. This processing method utilizes the conversion of electrical energy to thermal energy, and through pulse discharge, local high temperature is generated on the workpiece surface, so that the material on the workpiece surface is melted or even vaporized, thereby being removed. The material of the tapered thread segment is spring steel, which belongs to iron-based material and has conductivity, and it engages with the BFe30 heat exchange tube, and forms a conductive circuit with the tool electrode clamped on the electric spark machine gun head 1, which has the condition to implement electric spark removal of materials, and a character-shaped notch can be made on the tapered thread segment to release the engagement force between the tapered thread segment and the inner wall of the heat exchange tube, and then other tools such as a screwdriver are used to remove the remaining material.

[0031] Specific embodiment two: in combination with Figures 7-9, the present embodiment describes a device for removing a broken tapered thread segment in a heat exchange tube, which is characterized in that: the cutting equipment further includes a magnetic support 2 for the head and an electric spark machine clamp 3; the electric spark machine gun head 1 is installed on the tube plate through the magnetic support 2 for the head, the electric spark machine clamp 3 is installed at the front end of the electric spark machine gun head 1, and the plate-shaped electrode 4 is installed on the electric spark machine clamp 3. The other methods are the same as those of specific embodiment one.

[0032] Specific implementation three: in combination with figure 7-9, the device for taking out the broken conical thread section in the heat exchange pipe, the thickness of the plate-shaped electrode 4 is 2mm. The other methods are the same as specific implementation two.

[0033] Specific implementation four: in combination with 1-10, the operation method of the device for taking out the broken conical thread section in the heat exchange pipe, the method is realized according to the following steps:

[0034] Step one: the electric spark gun head 1 is fixed on the tube plate through the magnetic support 2 of the head;

[0035] Step two: select 2mm thick copper material plate-shaped electrode 4 as the electrode material for opening a slit;

[0036] Step three: clamp the plate-shaped electrode 4 to the electric spark machine clamp mouth 3 and tighten, adjust the position of the electric spark gun head 1 to confirm the position of the plate-shaped electrode 4, so that the plate-shaped electrode 4 is located in the center of the pipe;

[0037] Step four: inject tap water into the water injection pipe 5 and start the electric spark gun head 1 at the same time, and the repeated advance and retreat of the plate-shaped electrode 4 will make a slit on the side close to the pipe wall, and the eroded powder will be taken out of the pipe by the flowing water, so as to avoid the accumulation affecting the normal work of the plate-shaped copper electrode;

[0038] Step five: when the slit penetrates the conical thread section, the engagement force between the conical thread section and the BFe30 heat exchange pipe will be released, and the loosened conical thread section will be loosened and taken out.

[0039] Specific implementation five: in combination with 1-10, the operation method of the device for taking out the broken conical thread section in the heat exchange pipe, the method is realized according to the following steps:

[0040] The above specific implementation can be adjusted in different ways by those skilled in the art without departing from the principles and purposes of the present application, the protection scope of the present application is subject to the claims and is not limited by the above specific implementation, each implementation scheme within the scope is subject to the constraints of the present application.

Claims

1. A device for removing a broken tapered threaded section from inside a heat exchanger tube, characterized in that: It includes cutting device and water injection pipe (5); cutting device includes electric spark machine gun head (1) and plate electrode (4); plate electrode (4) is installed on electric spark machine gun head (1), and the electric spark machine gun head (1) is installed on the pipe plate through the plate electrode (4) electric erosion cutting of the conical thread segment, and the water outlet end of the water injection pipe (5) is arranged close to the front end of the plate electrode (4).

2. A device for removing a fractured tapered threaded section within a heat exchange tube according to claim 1, wherein: The cutting device further comprises a magnetic support (2) for the head and an electric spark machine clamp (3); the electric spark machine gun head (1) is installed on the pipe plate through the magnetic support (2) for the head, and the electric spark machine clamp (3) is installed on the front end of the electric spark machine gun head (1), and the plate electrode (4) is installed on the electric spark machine clamp (3).

3. The device of claim 2, wherein: The plate electrode (4) is a plate electrode (4) made of brass material, and the thickness of the plate electrode (4) is 2mm.

4. The method of claim 1-3, wherein the method comprises the steps of: The method is realized according to the following steps: Step one: the electric spark machine gun head (1) is fixed on the pipe plate through the magnetic support (2) for the head; Step two: select 2mm thick plate electrode (4) of brass material as electrode material for opening a one-way notch; Step three: clamp the plate electrode (4) to the electric spark machine clamp (3) and tighten, and confirm the position of the plate electrode (4) by adjusting the position of the electric spark machine gun head (1), so that the plate electrode (4) is located in the center of the pipe; Step four: inject the water injection pipe (5) with tap water and start the electric spark machine gun head (1) at the same time, and the repeated advance and retreat of the plate electrode (4) will make a one-way notch on the conical thread segment near the pipe wall side, and the eroded powder will be taken out of the pipe by the flowing water, so as to avoid the accumulation affecting the normal work of the plate brass electrode; Step five: when the one-way notch penetrates the conical thread segment, the engagement force between the conical thread segment and the BFe30 heat exchange pipe will be released, and the loosened conical thread segment will be loosened and taken out.

5. The method of claim 4, wherein: In step five, after the one-way notch penetrates the conical thread segment, the loosened conical thread segment is loosened and taken out by using a one-way flat mouth screwdriver with a wrench.

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