Blast furnace shell vertical welding seam heat treatment device and use method thereof

Abstract

A blast furnace shell vertical weld seam heat treatment device and its use method include a weld seam heat treatment inner mold, a weld seam heat treatment outer mold and a connecting and fixing member. The weld seam heat treatment inner mold is a vertically used long strip open box, and the weld seam heat treatment outer mold is a long strip open box corresponding to the weld seam heat treatment inner mold. The connecting and fixing member is arranged on the upper and lower sides of the inner mold end plate and the outer mold end plate, and is used to fix the weld seam heat treatment inner mold and the weld seam heat treatment outer mold on the vertical weld seam of the steel ring belt. The present invention can perform heat treatment operations on the blast furnace shell vertical weld seam by laying insulation cotton and heating plates in the weld seam heat treatment inner mold and the weld seam heat treatment outer mold and installing a connecting thermocouple on the heating plate. It can effectively solve the problem of fixing and clamping the heating block and insulation cotton during the heat treatment of the vertical weld seam at the blast furnace shell construction site, improve work efficiency, have a good insulation effect, and reduce heat loss. It has a good heat treatment effect on the weld seam, heat-affected zone, parent material, etc.

Description

Technical Field

[0001] The present invention relates to a weld heat treatment fixture and a use method thereof, and in particular to a blast furnace shell vertical welding weld heat treatment device and a use method thereof, belonging to the field of weld heat treatment equipment and weld heat treatment technology. Background Art

[0002] The construction of a blast furnace first requires the production of the blast furnace shell, which is usually composed of a shell ring composed of multiple steel plates stacked together.

[0003] The steel plates used to make blast furnace shells are very thick, generally reaching 45 to 70 mm.

[0004] Modern blast furnace shells are usually very large. If they are manufactured in the manufacturer's production workshop, they cannot be safely transported to the construction site under current conditions after they are completed. Therefore, in the existing technology, the blast furnace shell is generally partially rolled out of steel plates in the manufacturer's production workshop, and then transported to the blast furnace construction site for welding and assembly to complete the construction of the blast furnace shell.

[0005] Since the blast furnace shell is an extremely important part of the blast furnace and the steel plate of the blast furnace shell is very thick, the welding and assembly of the blast furnace shell is usually very difficult and the welding quality requirements are very high. In particular, when the rolled steel plates are vertically welded to form a ring belt, the operation is even more difficult and the quality of the vertical welding is even more demanding. Generally speaking, after the vertical welding of the steel plates is completed on site, all vertical welds must be heat treated to meet the quality requirements of the blast furnace shell.

[0006] Usually, the heat treatment of the vertical weld of the blast furnace shell adopts the method of thermocouple heating and insulation cotton insulation.

[0007] Since the construction environment at the blast furnace shell construction site is usually poor, thermocouples and insulation cotton cannot generally be fixed on the vertical welds easily, quickly and stably. Therefore, the heat treatment of the vertical welds of the blast furnace shell is very difficult.

[0008] In addition, as the construction of the blast furnace shell progresses, the blast furnace shell is built higher and higher, and the corresponding vertical welding and vertical weld heat treatment operations become more and more difficult, and the quality becomes more and more difficult to guarantee.

[0009] In the prior art, some relevant technical solutions and technical literature can be retrieved for issues such as weld heat treatment, such as:

[0010] The utility model patent (application number: 201721869343.7) provides a "device for heat treatment and internal insulation reinforcement of pipeline welds", which includes: a pressure plate, a connecting clamp, a pressure piece, a connecting sleeve and a shorting rod. The pressure plate expands outward to compact the internal insulation cotton of the pipeline. The connecting clamp connects the pressure plate joints. The shorting rod is connected through the connecting sleeve and is used in conjunction with the pressure piece to squeeze and fix the pressure plate. The raw materials used in this utility model are easy to obtain, the structure is simple, and the operation is convenient. It is suitable for heat treatment and insulation reinforcement of thick-walled pipelines of various specifications on construction sites.

[0011] The invention patent (application number: 201410016677.4) provides a "Nuclear Power Plant Steel Containment Installation Weld Heat Treatment Device and Heat Treatment Method", which mainly consists of a main frame (Z-1), a heating and heat preservation device (Z-2), a walking mechanism (Z-3), a temperature sensor (Z-4), and an automatic temperature controller (Z-5). During heat treatment, the walking mechanism of the heat treatment device is supported on the upper edge of the containment wall plate and moved along the walking mechanism so that the heating and heat preservation devices on both sides of the containment wall plate are in a position to clamp the weld to be heat treated. The temperature sensor is then placed at the weld to be heat treated. After the electric heating device is connected, the weld is heated to a predetermined temperature under the closed-loop control of the automatic temperature controller. The invention can ensure a close fit between the insulation cotton, the electric heating device, and the weld, significantly improve the weld quality and shorten the welding period by ensuring the quality and efficiency of the heat treatment.

[0012] The invention patent (application number: 201610446991.5) provides a method for heat treatment of girth welds of steel containment vessels in nuclear power plants. The method includes dividing the girth weld into several sections, cleaning the surface of the girth weld, arranging temperature measuring thermocouples in the heat treatment area, arranging temperature controlling thermocouples on the heating plate, fixing the heating plate in the heat treatment area, and then covering the heating plate with insulation cotton. The temperature of the heating plate is raised to below the lower limit of the heat treatment temperature range, so that the temperature values ​​detected by all temperature measuring thermocouples are the same and below the lower limit of the heat treatment temperature range, and the temperature values ​​detected by all temperature measuring thermocouples are successively raised to within the heat treatment temperature range, and the temperature is kept warm. After the heat preservation is completed, the temperature is cooled. This method can reduce the power load of the heat treatment and improve the effect of the heat treatment.

[0013] The invention patent application (application number: 201810722902.4) provides a "Method for Ensuring Uniformity of Heat Treatment of Large Diameter Thick-Walled Pipe Welds", which includes: heating the outer wall of the pipe at the weld position while heating the pipe cavity of the pipe at the weld position, and then heating the inner wall of the pipe. The present invention uses a heat treatment process in which the inner and outer walls are heated simultaneously to reduce the temperature difference between the inner and outer walls of the large diameter thick-walled pipe weld, thereby achieving the purpose of eliminating welding residual stress and improving the performance of the weld joint through heat treatment.

[0014] Although the above-mentioned patent technologies or patent application documents have proposed corresponding solutions to the problems they are trying to solve, for the heat treatment of vertical welds of ultra-large and ultra-thick steel plate equipment such as blast furnace shells, during the process of heat treatment of vertical welds of blast furnace shells construction site, there is no effective technical solution or direct technical inspiration for the basic problem of how to conveniently, quickly and effectively clamp and fix the heating blocks and insulation cotton for heat treatment of vertical welds, which cannot meet the needs of heat treatment of vertical welds of relevant blast furnace shells. Summary of the Invention

[0015] In order to overcome the shortcomings of the existing technology, the embodiment of the present invention provides a blast furnace shell vertical welding seam heat treatment device and its use method, the purpose of which is to quickly and effectively solve the problem of clamping and fixing the heating block and its insulation cotton during the heat treatment process of the blast furnace shell vertical welding seam at the blast furnace shell construction site, provide prerequisite and basic conditions for the heat treatment work of the blast furnace shell vertical welding seam at the construction site, ensure the construction quality of the blast furnace shell, and improve construction efficiency.

[0016] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0017] A heat treatment device for vertical welding seams of a blast furnace shell, wherein the blast furnace shell is formed by stacking steel rings, wherein the steel rings have curved steel plates spliced ​​together by vertical welding, and is characterized by comprising:

[0018] A weld heat treatment inner mold, a weld heat treatment outer mold set up opposite to the weld heat treatment inner mold, and a connecting and fixing member;

[0019] The weld heat treatment inner mold is a vertically used long open box body, including inner mold end plates provided at the upper and lower ends of the box body, inner mold side plates connecting the two inner mold end plates, and an inner mold cover plate or an inner mold circular arc cover plate. The inner mold end plates are provided with through holes, and the edge of the opening side of the inner mold end plates is an outward convex arc shape.

[0020] The weld heat treatment outer mold is a vertically used long open box body, including outer mold end plates arranged at the upper and lower ends of the box body, outer mold side plates connecting the two outer mold end plates, and an outer mold cover plate or an outer mold circular arc cover plate. The outer mold end plates are provided with through holes, and the edge of the opening side of the outer mold end plates is an inwardly concave arc;

[0021] The connecting and fixing components are respectively arranged on the upper and lower sides of the inner mold end plate and the outer mold end plate, and are used to fix the weld heat treatment inner mold and the weld heat treatment outer mold on the steel ring belt.

[0022] Furthermore, the interior of the weld heat treatment inner mold and the weld heat treatment outer mold are respectively provided with a plurality of rib partitions, and the rib partitions are used to enhance the strength of the inner mold cover plate, the outer mold cover plate or the inner mold arc-shaped cover plate, and the outer mold arc-shaped cover plate and to divide the internal space of the weld heat treatment inner mold and the weld heat treatment outer mold.

[0023] Furthermore, the length of the weld heat treatment inner mold and the weld heat treatment outer mold is equal to the length of the steel ring belt vertical weld, the width of the weld heat treatment inner mold and the weld heat treatment outer mold is 0.45~0.55m, and the thickness of the weld heat treatment inner mold and the weld heat treatment outer mold is 85~90% of the thickness of the insulation cotton required for heat treatment of the blast furnace shell vertical weld.

[0024] Furthermore, the connecting and fixing component includes a hanger and bolts and nuts, the hanger is provided with a screw hole, the bolt is inserted into the screw hole and the nut is used to connect and fix the weld heat treatment inner mold and the weld heat treatment outer mold between the inner and outer sides of the steel ring belt.

[0025] Furthermore, the pendant is made of angle steel.

[0026] Furthermore, the weld heat treatment inner mold and the weld heat treatment outer mold are made of 5mm steel plates.

[0027] Furthermore, a method for using the above-mentioned blast furnace shell vertical welding weld heat treatment device is characterized by comprising the following steps:

[0028] S10) laying thermal insulation cotton in the weld heat treatment inner mold and the weld heat treatment outer mold respectively;

[0029] S20) laying heating plates on the insulation cotton of the weld heat treatment inner mold and the weld heat treatment outer mold respectively, and installing thermocouples on the heating plates, and connecting cables to the thermocouples through through holes on the inner mold end plate and the outer mold end plate respectively to connect to an external power supply;

[0030] S30) attaching the weld heat treatment inner mold and the weld heat treatment outer mold to the inner and outer sides of the vertical weld of the steel ring belt respectively;

[0031] S40) The weld heat treatment inner mold and the weld heat treatment outer mold are respectively connected and fixed between the inner and outer sides of the steel ring belt by the connecting and fixing components, so that the vertical weld of the blast furnace shell can be heat treated.

[0032] Furthermore, the thermal insulation cotton is aluminum silicate cotton.

[0033] Compared with the prior art, the beneficial effects and significant improvements of the embodiments of the present invention are:

[0034] 1) An embodiment of the present invention provides a heat treatment device for a vertical weld seam of a blast furnace shell and a method for using the device. The device comprises a vertically arranged long strip weld seam heat treatment inner mold, an outer weld seam heat treatment mold positioned opposite the inner mold, and a connecting and fixing member. The device is connected and fixed between the inner and outer sides of a steel ring band of the blast furnace shell. Furthermore, by laying insulation cotton and heating plates within the inner and outer molds and installing and connecting thermocouples on the heating plates, the heat treatment operation can be performed on the vertical weld seam of the blast furnace shell.

[0035] 2) The embodiments of the present invention provide a heat treatment device for vertical weld seams of blast furnace shells and a method for using the device. This device can effectively solve the problem of the inability to effectively fix and clamp heating blocks and insulation cotton using conventional methods during heat treatment of vertical weld seams at blast furnace shell construction sites. This device can improve work efficiency, save a large amount of preparation time for heat treatment operations and loss of insulation materials, and has good insulation effect, low heat loss, and good heat treatment effect on welds, heat-affected zones, parent materials, etc.

[0036] 3) The embodiment of the present invention provides a heat treatment device for the vertical welding seams of the blast furnace shell. It is simple and convenient to manufacture, inexpensive, highly applicable, and can be reused many times. It is easy to use and has reliable effects. It provides the prerequisite and basic conditions for the heat treatment of the vertical welding seams of the blast furnace shell at the construction site, improves work efficiency, ensures the construction quality of the blast furnace shell, and has a very broad market application prospect. Therefore, it is of great value for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for the embodiments of the present invention.

[0038] Obviously:

[0039] The drawings described below are only drawings of some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work, but these other drawings also belong to the drawings required for use in the embodiments of the present invention.

[0040] Figure 1 A schematic diagram of the blast furnace shell structure for which a device for heat treating a vertical weld seam of a blast furnace shell and a method for using the device are provided in an embodiment of the present invention;

[0041] Figure 2 A schematic diagram of the three-dimensional structure of a blast furnace shell vertical welding seam heat treatment device including side plates and cover plates provided in an embodiment of the present invention;

[0042] Figure 3 A schematic diagram of the three-dimensional structure of a blast furnace shell vertical welding weld heat treatment device including an arc-shaped cover plate provided by an embodiment of the present invention;

[0043] Figure 4 A schematic block diagram of the use process of a blast furnace shell vertical welding weld heat treatment device provided by an embodiment of the present invention;

[0044] Figure 5 The present invention provides a schematic top view of the structure of a blast furnace shell vertical welding seam heat treatment device during use.

[0045] In the picture:

[0046] 10-steel ring belt, 11-steel plate, 12-vertical weld;

[0047] 20-weld heat treatment inner mold, 21-inner mold end plate, 22-inner mold side plate, 23-inner mold cover plate, 24-inner mold arc cover plate;

[0048] 30-weld heat treatment outer mold, 31-outer mold end plate, 32-outer mold side plate, 33-outer mold cover plate, 34-outer mold arc cover plate;

[0049] 40-connecting and fixing components;

[0050] 50-ribbed partition;

[0051] 61- thermal insulation cotton, 62- heating plate, 63- thermocouple. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solutions, beneficial effects and significant improvements of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the drawings provided in the embodiments of the present invention. Obviously, all the described embodiments are only partial embodiments of the present invention, rather than all embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0053] It should be noted that:

[0054] The terms "first", "second", etc. in the specification and claims of the present invention and the drawings of the embodiments of the present invention are only used to distinguish different objects, rather than to describe a specific order; in addition, the term "comprise" and any variations thereof are intended to cover non-exclusive inclusions; for example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices.

[0055] What needs to be understood is:

[0056] In the description of the embodiments of the present invention, some indicative orientation or position words used are only based on the orientation or position relationship shown in the drawings of the embodiments of the present invention. They are for the convenience of describing the embodiments of the present invention and simplifying the explanation, rather than indicating or implying that the described device or element must have a specific orientation, specific orientation structure and operation. Therefore, they should not be understood as limiting the present invention.

[0057] In the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, a movable connection, or an integrated connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly specified and limited.

[0058] For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] It should also be noted that:

[0060] The following specific embodiments may be combined with each other, and the same or similar concepts or processes therein may not be described in detail in some embodiments.

[0061] The technical solution of the present invention is described in detail below with reference to specific embodiments.

[0062] Example

[0063] like Figure 1 A blast furnace shell vertical welding seam heat treatment device and its use method provided by an embodiment of the present invention is shown in a schematic diagram of the blast furnace shell structure:

[0064] The blast furnace shell provided in this embodiment is targeted at a vertical welding seam heat treatment device and a method of use thereof, which is composed of stacked steel ring belts 10. The steel ring belts 10 are composed of curved steel plates 11 spliced ​​together by vertical welding. The vertical welding seam 12 is between the two curved steel plates 11 and is usually double-sided welded.

[0065] like Figure 2 A heat treatment device for vertical welding seams of a blast furnace shell provided by an embodiment of the present invention includes a schematic diagram of a three-dimensional structure of a side plate and a cover plate, Figure 3 A blast furnace shell vertical welding seam heat treatment device provided by an embodiment of the present invention includes a three-dimensional structural schematic diagram of an arc-shaped cover plate:

[0066] A blast furnace shell vertical welding seam heat treatment device, comprising:

[0067] A weld heat treatment inner mold 20, a weld heat treatment outer mold 30 set opposite to the weld heat treatment inner mold 20, and a connecting and fixing member 40;

[0068] The weld heat treatment inner mold 20 is a vertically used long open box body, comprising inner mold end plates 21 provided at the upper and lower ends of the box body, inner mold side plates 22 connecting the two inner mold end plates 21, and an inner mold cover plate 23 or an inner mold circular arc cover plate 24. The inner mold end plates 21 are provided with through holes, and the edge of the opening side of the inner mold end plates 21 is convex arc-shaped.

[0069] The weld heat treatment outer mold 30 is a vertically-mounted, long, open box body, comprising outer mold end plates 31 disposed at the upper and lower ends of the box body, outer mold side plates 32 connecting the two outer mold end plates, and an outer mold cover plate 33 or an outer mold circular arc cover plate 34. A through hole is formed on the outer mold end plate 31, and the edge of the opening of the outer mold end plate 31 is inwardly concave.

[0070] The connecting and fixing members 40 are respectively disposed on the upper and lower sides of the inner die end plate 21 and the outer die end plate 31 to fix the weld heat treatment inner die 20 and the weld heat treatment outer die 30 on the steel endless belt 10 .

[0071] Furthermore, as a preferred technical solution, a plurality of rib partitions 50 are respectively provided inside the weld heat treatment inner mold 20 and the weld heat treatment outer mold 30. The rib partitions 50 are used to enhance the strength of the inner mold cover plate 23 and the outer mold cover plate 33, or the inner mold arc-shaped cover plate 24 and the outer mold arc-shaped cover plate 34, and to divide the internal space of the weld heat treatment inner mold 20 and the weld heat treatment outer mold 30.

[0072] Furthermore, the length of the weld heat treatment inner mold 20 and the weld heat treatment outer mold 30 is equal to the length of the vertical weld 12 of the steel ring belt 10, the width of the weld heat treatment inner mold 20 and the weld heat treatment outer mold 30 is 0.45~0.55m, and the thickness of the weld heat treatment inner mold 20 and the weld heat treatment outer mold 30 is 85~90% of the thickness of the insulation cotton required for heat treatment of the vertical weld of the blast furnace shell.

[0073] Furthermore, in this embodiment, the connecting and fixing component 40 may include a hanger and bolts and nuts. The hanger is provided with a screw hole, the bolt is inserted into the screw hole and the nut is used to connect and fix the weld heat treatment inner mold and the weld heat treatment outer mold between the inner and outer sides of the steel ring belt.

[0074] Furthermore, in this embodiment, the hanger can be made of angle steel.

[0075] Furthermore, in this embodiment, the weld heat treatment inner mold 20 and the weld heat treatment outer mold 30 can be made of 5 mm steel plates.

[0076] like Figure 4 A schematic block diagram of the use process of a blast furnace shell vertical welding weld heat treatment device provided by an embodiment of the present invention, Figure 5 A schematic diagram of a top view of a heat treatment device for vertical welding of a blast furnace shell according to an embodiment of the invention is shown in the following figure:

[0077] A method for using the above-mentioned blast furnace shell vertical welding weld heat treatment device includes the following steps:

[0078] S10) laying thermal insulation cotton 60 in the weld heat treatment inner mold 20 and the weld heat treatment outer mold 30 respectively;

[0079] S20) A heating plate 70 is laid on the insulation cotton 60 of the weld heat treatment inner mold 20 and the weld heat treatment outer mold 30, respectively. A thermocouple 80 is installed on the heating plate 70. A cable (not shown) connecting the thermocouple 80 passes through a through hole on the inner mold end plate 21 and the outer mold end plate 31, respectively, and is connected to an external power source.

[0080] S30) attaching the weld heat treatment inner mold 20 and the weld heat treatment outer mold 30 to the inner and outer sides of the vertical weld 12 of the steel ring belt 10 respectively;

[0081] S40) The weld heat treatment inner mold 20 and the weld heat treatment outer mold 30 are respectively connected and fixed between the inner and outer sides of the steel ring belt 10 by connecting and fixing components 40, so that the vertical weld of the blast furnace shell can be heat treated.

[0082] Furthermore, in this embodiment, the thermal insulation cotton 60 can be made of aluminum silicate cotton.

[0083] From the above description, we can see that:

[0084] First, this embodiment provides a blast furnace shell vertical weld seam heat treatment device and its use method. The blast furnace shell vertical weld seam heat treatment device is constructed by using a vertically used long strip weld seam heat treatment inner mold, a weld seam heat treatment outer mold set opposite to the weld seam heat treatment inner mold, and a connecting and fixing member. The device is connected and fixed between the inner and outer sides of the blast furnace shell steel ring band. By laying insulation cotton and heating plates in the weld seam heat treatment inner mold and the weld seam heat treatment outer mold, and installing and connecting thermocouples on the heating plates, the blast furnace shell vertical weld seam can be heat treated.

[0085] Secondly, the present embodiment provides a blast furnace shell vertical welding weld heat treatment device and its use method, which can effectively solve the problem that the usual method cannot effectively fix the clamping heating block and the insulation cotton during the heat treatment of the vertical welding weld at the blast furnace shell construction site. It can improve work efficiency, save a lot of preparation time for heat treatment operations and the loss of insulation materials, has good insulation effect and small heat loss, and has a good heat treatment effect on welds, heat-affected zones, parent materials, etc.

[0086] In summary, we can see that:

[0087] The embodiment of the present invention provides a heat treatment device for the vertical welding seams of blast furnace shells. The device is simple and convenient to manufacture, inexpensive, highly applicable, and can be reused multiple times. The method of use is simple and the effect is reliable. It provides the prerequisite and basic conditions for the heat treatment of the vertical welding seams of blast furnace shells at the construction site, improves work efficiency, ensures the construction quality of the blast furnace shell, and has a very broad market application prospect. Therefore, it has great promotion and application value.

[0088] In the description of the above manual:

[0089] The terms "this embodiment", "an embodiment of the present invention", "as shown in", "further", etc., mean that the specific features, structures, materials or characteristics described in the embodiment or example are included in at least one embodiment or example of the present invention;

[0090] In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example, and the specific features, structures, materials or characteristics described can be combined or combined in a suitable manner in any one or more embodiments or examples; in addition, under the premise that no contradiction arises, ordinary technicians in this field can combine or combine different embodiments or examples described in this specification and the features of different embodiments or examples.

[0091] Finally, it should be noted that:

[0092] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents, and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention. Non-essential improvements, adjustments or replacements made by those skilled in the art based on the contents of this specification are all within the scope of protection required by the present invention.

Claims

1. A heat treatment device for vertical welding seams of a blast furnace shell, wherein the blast furnace shell is formed by stacking steel rings, wherein the steel rings have curved steel plates spliced ​​together by vertical welding, characterized in that: include: A weld heat treatment inner mold, a weld heat treatment outer mold set up opposite to the weld heat treatment inner mold, and a connecting and fixing member; The weld heat treatment inner mold is a vertically used long open box body, including inner mold end plates provided at the upper and lower ends of the box body, inner mold side plates connecting the two inner mold end plates, and an inner mold cover plate or an inner mold circular arc cover plate. The inner mold end plates are provided with through holes, and the edge of the opening side of the inner mold end plates is an outward convex arc shape. The weld heat treatment outer mold is a vertically used long open box body, including outer mold end plates arranged at the upper and lower ends of the box body, outer mold side plates connecting the two outer mold end plates, and an outer mold cover plate or an outer mold circular arc cover plate. The outer mold end plates are provided with through holes, and the edge of the opening side of the outer mold end plates is an inwardly concave arc; The connecting and fixing components are respectively arranged on the upper and lower sides of the inner mold end plate and the outer mold end plate, and are used to fix the weld heat treatment inner mold and the weld heat treatment outer mold on the steel ring belt; A plurality of rib partitions are further provided inside the weld heat treatment inner mold and the weld heat treatment outer mold, respectively, and the rib partitions are used to enhance the strength of the inner mold cover plate, the outer mold cover plate or the inner mold arc-shaped cover plate, and the outer mold arc-shaped cover plate and to divide the internal space of the weld heat treatment inner mold and the weld heat treatment outer mold; The connecting and fixing member includes a hanger and a bolt and nut. The hanger is provided with a screw hole. The bolt is inserted into the screw hole and the nut is used to connect and fix the weld heat treatment inner mold and the weld heat treatment outer mold between the inner and outer sides of the steel ring belt. Insulation cotton is laid inside the weld heat treatment inner mold and the weld heat treatment outer mold; a heating plate is laid on the insulation cotton, and a thermocouple is installed on the heating plate. The cables connecting the thermocouples pass through the through holes on the inner mold end plate and the outer mold end plate respectively and are connected to an external power supply.

2. The heat treatment device for vertical welding seams of blast furnace shells according to claim 1, characterized in that: The length of the weld heat treatment inner mold and the weld heat treatment outer mold is equal to the length of the steel ring belt vertical weld, the width of the weld heat treatment inner mold and the weld heat treatment outer mold is 0.45~0.55m, and the thickness of the weld heat treatment inner mold and the weld heat treatment outer mold is 85~90% of the thickness of the insulation cotton required for heat treatment of the blast furnace shell vertical weld.

3. The heat treatment device for vertical welding seams of a blast furnace shell according to claim 1, characterized in that: The pendant is made of angle steel.

4. The heat treatment device for vertical welding seams of blast furnace shells according to claim 1, characterized in that: The weld heat treatment inner mold and the weld heat treatment outer mold are made of 5mm steel plates.

5. A method for using the blast furnace shell vertical welding seam heat treatment device according to any one of claims 1 to 4, characterized in that: The steps include: S10) laying thermal insulation cotton in the weld heat treatment inner mold and the weld heat treatment outer mold respectively; S20) placing heating plates on the insulation cotton of the weld heat treatment inner mold and the weld heat treatment outer mold respectively, and installing thermocouples on the heating plates. Cables connecting the thermocouples pass through through holes in the inner mold end plate and the outer mold end plate respectively and are connected to an external power source. S30) attaching the weld heat treatment inner mold and the weld heat treatment outer mold to the inner and outer sides of the vertical weld of the steel ring belt respectively; S40) The weld heat treatment inner mold and the weld heat treatment outer mold are respectively connected and fixed between the inner and outer sides of the steel ring belt by the connecting and fixing components, thereby performing a heat treatment operation on the vertical weld of the blast furnace shell.

6. The method for using the blast furnace shell vertical welding seam heat treatment device according to claim 5, characterized in that: The thermal insulation cotton is aluminum silicate cotton.

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