Heating device for inner hole welding

Abstract

The utility model discloses a heating device for inner hole welding, which comprises an induction coil sleeved on the excircle surface of a tube plate and a heating rod extending into the inner hole of the tube plate and the inner hole of a heat exchange tube, a temperature sensor for detecting the temperature of a target welding seam is fixedly connected onto the heating rod, and the heating rod and the temperature sensor are electrically connected with a controller. According to the utility model, the induction coil can heat the whole tube plate, the heating rod can extend into the inner hole of the tube plate and the inner hole of the heat exchange tube so as to heat the target welding seam, and the heating rod can be matched with the temperature sensor to accurately heat the target welding seam, so that accurate preheating and accurate post-heating are facilitated; and the welding seam quality of the pipe and the pipe plate is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to pipe tube plate welding technical field, especially relate to a heating device for inner hole welding. BACKGROUND

[0002] The pipe tube plate structure of the shell-and-tube heat exchanger is mostly end face welding structure, and the welding seam of the structure bears shearing force, and the stress condition is not good. Therefore, the pipe tube plate welding seam of many important devices currently adopts inner hole welding butt joint structure, but the pipe tube plate welding seam is located at the back of the tube plate, and it is difficult to adopt the conventional flame preheating mode, and the multi-layer heat exchange pipes are shielded from each other, and it is difficult to accurately preheat and measure the temperature, which can result in poor quality of the pipe tube plate welding seam of the device, and the pipe tube plate welding seam of the device often fails under the harsh working conditions. SUMMARY

[0003] The utility model discloses to overcome prior art defects, provide a kind of heating device for inner hole welding, can improve pipe tube plate welding seam quality.

[0004] The utility model discloses the purpose is realized by the following technical scheme:

[0005] A kind of heating device for inner hole welding, it includes the induction coil for being set on the outer circular face of tube plate and the heating rod for being inserted into the inner hole of tube plate and the inner hole of heat exchange pipe, heating rod is fixedly connected with the temperature sensor for detecting the temperature at target welding seam, heating rod and temperature sensor are electrically connected with controller.

[0006] The beneficial effects of the above technical scheme are: induction coil can heat the whole tube plate, heating rod can be inserted into the inner hole of tube plate and the inner hole of heat exchange pipe to heat target welding seam, and heating rod can cooperate with temperature sensor to accurately heat target welding seam, so as to facilitate accurate preheating and accurate post-heating, and then facilitate to improve the quality of pipe tube plate welding seam.

[0007] In one embodiment, one end of the heating rod is a heating portion for being inserted into the inner hole of tube plate and the inner hole of heat exchange pipe.

[0008] The beneficial effects of the above technical scheme are: by inserting the heating portion of heating rod into the inner hole of tube plate and the inner hole of heat exchange pipe, the heating portion is used to heat around target welding seam.

[0009] In one embodiment, the other end of the heating rod is a hand-held portion.

[0010] The beneficial effects of the above technical scheme are: the hand-held portion can provide a hand-held position, and this place is not heated, and the temperature of the hand-held portion is lower, so that the operator can hold it conveniently.

[0011] In one embodiment, the heating rod is provided with a positioning portion between the heating portion and the handheld portion.

[0012] The positioning portion can separate the heating portion and the handheld portion, so as to provide a handheld portion with lower temperature, and facilitate determination of the insertion depth of the heating rod, thereby facilitating positioning and installation of the heating rod.

[0013] In one embodiment, the axial distance between the positioning portion and the temperature sensor matches the axial distance between the front surface of the tube sheet and the target weld.

[0014] The axial position of the temperature sensor matches the axial position of the target weld, so as to facilitate accurate detection of the temperature at the target weld by the temperature sensor.

[0015] In one embodiment, the heating device for inner hole welding comprises a plurality of heating rods, and each of the heating rods is electrically connected to the controller.

[0016] The controller is used to heat the plurality of heating rods, so as to facilitate simultaneous heating of an entire layer of target welds.

[0017] In one embodiment, the induction coil is electrically connected to the controller.

[0018] The controller is used to control the induction coil to heat the tube sheet.

[0019] In one embodiment, the induction coil is a medium-frequency induction coil.

[0020] The medium-frequency induction coil is used to perform auxiliary heating on the outer cylindrical surface of the tube sheet, because the mass and heat capacity of the tube sheet are large, and the heating input of the heating rods is insufficient.

[0021] In one embodiment, the heating rod is a finned heating rod.

[0022] In one embodiment, the temperature sensor is a temperature-sensitive thermocouple.

[0023] The utility model discloses the beneficial effect lies in:

[0024] The induction coil can heat the entire tube sheet, the heating rod can extend into the inner hole of the tube sheet and the inner hole of the heat exchange pipe to heat the target weld, and the heating rod can cooperate with the temperature sensor to accurately heat the target weld, thereby facilitating accurate preheating and accurate post-heating, and further facilitating improvement of the quality of the tube sheet weld. BRIEF DESCRIPTION OF DRAWINGS

[0025] The utility model will be described in further detail below based on the embodiments and with reference to the drawings.

[0026] Wherein:

[0027] Figure 1 A structure diagram of the inner hole welding butt joint structure is shown;

[0028] Figure 2 A local enlarged view of position A in the figure is shown; Figure 1

[0029] Figure 3 An installation diagram of the utility model is shown;

[0030] Figure 4 A local enlarged view of position B in the figure is shown; Figure 3

[0031] Figure 5 An installation diagram of the temperature sensor in the utility model is shown;

[0032] In the drawings, the same components use the same reference numerals. The drawings are not in actual proportion.

[0033] Reference numerals:

[0034] 1 - tube sheet, 2 - heat exchange tube, 3 - heating rod, 301 - heating part, 302 - handheld part, 303 - positioning part, 4 - induction coil, 5 - temperature control cabinet, 6 - temperature sensor. DETAILED DESCRIPTION

[0035] The utility model will be described in further detail below based on the embodiments and with reference to the drawings.

[0036] At present, the pipe tube sheet weld of many important equipment adopts the inner hole welding butt joint structure as shown in Figure 1 and Figure 2 The pipe tube sheet weld is located at the back of the tube sheet 1, and it is difficult to use the conventional flame preheating method, and the multi-layer heat exchange tube 2 will shield each other, so it is difficult to accurately preheat and measure the temperature, which will lead to poor quality of the pipe tube sheet weld of the equipment, and the working condition of the equipment is harsh, and the pipe tube sheet weld of the equipment often fails.

[0037] The utility model provides a kind of heating device for inner hole welding, as shown in Figures 3-5 It includes induction coil 4 for being set on the outer circumferential surface of tube sheet 1 and heating rod 3 for being inserted into the inner hole of tube sheet 1 and the inner hole of heat exchange tube 2, temperature sensor 6 for detecting the temperature of target weld is fixedly connected on heating rod 3, heating rod 3 and temperature sensor 6 are electrically connected with controller;Wherein, target weld is the to-be-processed weld at the junction of the inner hole of tube sheet 1 and the inner hole of heat exchange tube 2, heating rod 3 is finned heating rod, and temperature sensor 6 is temperature-sensitive thermocouple.​​

[0038] It can be understood that the induction coil 4 can preheat and keep warm the tube plate 1 as a whole, the heating rod 3 can extend into the hole of the tube plate 1 and the hole of the heat exchange pipe 2 to preheat and post-heat the target weld, and the heating rod 3 can cooperate with the temperature sensor 6 to accurately heat the target weld, thereby facilitating accurate preheating and accurate post-heating, and further facilitating improvement of the quality of the tube plate weld.

[0039] It should be noted that the controller can be a PCB board loaded with a C51 single-chip microcomputer, and the controller is arranged in the temperature control cabinet 5.

[0040] In one embodiment, as shown in Figure 4 and Figure 5 , one end of the heating rod 3 is a heating portion 301 for extending into the hole of the tube plate 1 and the hole of the heat exchange pipe 2; wherein the heating portion 301 is a hot end.

[0041] It can be understood that by extending the heating portion 301 of the heating rod 3 into the hole of the tube plate 1 and the hole of the heat exchange pipe 2, the heating portion 301 is used to heat the surrounding of the target weld.

[0042] In one embodiment, the other end of the heating rod 3 is a hand-held portion 302; wherein the hand-held portion 302 is a cold end.

[0043] It can be understood that the hand-held portion 302 can provide a hand-held position, and there is no heating here, and the temperature of the hand-held portion 302 is relatively low, which can facilitate the operator to hold it by hand.

[0044] In one embodiment, the heating rod 3 is provided with a positioning portion 303 between the heating portion 301 and the hand-held portion 302.

[0045] It can be understood that the positioning portion 303 can separate the heating portion 301 and the hand-held portion 302 in order to provide the hand-held portion 302 with a relatively low temperature, and facilitate determination of the insertion depth of the heating rod 3, thereby facilitating positioning and installation of the heating rod 3, and further controlling the heating range.

[0046] In one embodiment, the axial distance between the positioning portion 303 and the temperature sensor 6 matches the axial distance between the front surface of the tube plate 1 and the target weld.

[0047] It can be understood that in this way, the axial position of the temperature sensor 6 matches the axial position of the target weld, thereby facilitating accurate detection of the temperature at the target weld by the temperature sensor 6.

[0048] In one embodiment, the hole welding heating device includes a plurality of heating rods 3, and each of the plurality of heating rods 3 is electrically connected to the controller.

[0049] It can be understood that the controller is arranged to heat the plurality of heating rods 3, so as to facilitate heating of a whole layer of target welds at the same time.

[0050] It should be noted that each heating rod 3 can be individually temperature-controlled, and the temperature display of each heating rod 3 can be accurately observed, so that a display screen electrically connected with the controller can be arranged in the temperature control cabinet 5 to display the temperature of each heating rod 3.

[0051] In an embodiment, the induction coil 4 is electrically connected with the controller, so as to control the induction coil 4 to heat the tube plate 1 by using the controller.

[0052] In an embodiment, the induction coil 4 is a medium-frequency induction coil.

[0053] It can be understood that, since the tube plate 1 has large mass and large heat capacity, the heating input of the heating rod 3 is insufficient, and therefore the medium-frequency induction coil is used to assist in heating the outer circumferential surface of the tube plate 1.

[0054] The use process of the utility model is as follows:

[0055] The heat exchange pipe 2 is butted against the tube plate 1, and 5-6 turns of the induction coil 4 are wrapped around the outer circumferential surface of the tube plate 1, so as to preheat and keep warm the tube plate 1 as a whole;

[0056] The heating rod 3 is inserted into the inner hole of the tube plate 1 and the inner hole of the heat exchange pipe 2, and the temperature sensor 6 can detect the temperature of the target weld;

[0057] The heating rod 3 is powered on and cooperates with the temperature sensor 6 to precisely preheat the target weld, and keeps warm after being heated to a weldable temperature;

[0058] After the heating rod 3 is pulled out, the inner hole is welded;

[0059] After the welding is completed, the heating rod 3 is inserted into the position during preheating, and the heating rod 3 is powered on and cooperates with the temperature sensor 6 to precisely post-heat the target weld.

[0060] In the description of the utility model, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", "right" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0061] While the application has been described with reference to particular embodiments thereof, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present application. It will thus be appreciated that numerous modifications can be made to the illustrative embodiments and that other arrangements can be devised without departing from the spirit and scope of the present application as defined by the appended claims. It will be understood that the features described in relation to one embodiment can be used in combination with features described in relation to another embodiment.

Claims

1. A heating device for welding an internal bore, characterized in that, The utility model relates to a heat -detecting device for heat -exchange tube, including the inductive coil (4) for setting on the outer circular surface of tube sheet (1) and the heating stick (3) for extending into the hole of tube sheet (1) with the hole of heat exchange pipe (2), temperature sensor (6) for detecting the temperature of target weld is fixedly connected on the heating stick (3), the heating stick (3) and temperature sensor (6) are all electrically connected with controller.

2. The heating device for welding of internal cavities according to claim 1, characterized in that, One end of the heating stick (3) is a heating part (301) for extending into the hole of the tube sheet (1) and the hole of the heat exchange pipe (2).

3. A heating device for welding the interior hole according to claim 2, wherein The other end of the heating stick (3) is a hand-held part (302).

4. A heating device for welding the interior hole according to claim 3, wherein The heating stick (3) is provided with a positioning part (303) between the heating part (301) and the hand-held part (302).

5. A heating device for welding the interior hole according to claim 4, wherein The axial distance between the positioning part (303) and the temperature sensor (6) matches the axial distance between the front surface of the tube sheet (1) and the target weld.

6. The heating device for welding of internal cavities according to claim 1, characterized in that, A plurality of heating sticks (3) are electrically connected to the controller.

7. The heating device for welding of internal cavities according to claim 1, characterized in that, The inductive coil (4) is electrically connected to the controller.

8. The heating device for welding of internal cavities according to claim 1, characterized in that, The inductive coil (4) is a medium-frequency inductive coil.

9. The heating device for welding of internal cavities according to claim 1, characterized in that, The heating stick (3) is a finned heating stick.

10. The heating device for welding of internal cavities according to claim 1, characterized in that, The temperature sensor (6) is a temperature-sensitive thermocouple.

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