Trolley for heat treatment furnace, installation method thereof, and heat treatment furnace

Abstract

The present invention provides a trolley for a heat treatment furnace, an installation method thereof, and a heat treatment furnace. The heat treatment furnace includes a flame spray nozzle, and the trolley includes a moving mechanism, a refractory layer, and a shim mechanism, wherein the moving mechanism includes a moving body and a wheel group connected to the moving body; the refractory layer is arranged on the moving body; the shim mechanism is arranged on the refractory layer, and the shim mechanism is used to place the workpiece to be heat treated, and the shim mechanism includes a plurality of mutually parallel and equal-height support gaskets arranged perpendicular to the direction in which the trolley enters the furnace, and a plurality of support bars arranged on the support gaskets along the direction in which the trolley enters the furnace, the support gaskets have a predetermined thickness along the direction in which the trolley enters the furnace, the plane in which the upper surfaces of the plurality of support gaskets are located is the same plane as the plane in which the upper surfaces of the plurality of support bars are located, and the same plane is parallel to the ground, and the shim mechanism is a hollow structure. The trolley of the present invention can avoid overburning of the workpiece at the fire mouth, and the heat treatment temperature is uniform and the heat treatment quality of the workpiece is good.

Description

Technical Field

[0001] The present invention belongs to the technical field of petroleum and natural gas mechanical processing, and more particularly relates to a trolley for a heat treatment furnace, an installation method thereof, and a heat treatment furnace, and is particularly suitable for heat treatment of bent pipes. Background Art

[0002] After years of use, the refractory brick layer of the traditional heat treatment furnace trolley will be seriously damaged, and the fire-blocking method is outdated. The fire-blocking plate is still used, which will lead to uneven furnace temperature and easily cause the burner elbow to overburn, affecting the heat treatment quality of the elbow. Summary of the Invention

[0003] In view of the shortcomings of the prior art, one of the objectives of the present invention is to solve one or more problems existing in the prior art. For example, one of the objectives of the present invention is to provide a trolley for a heat treatment furnace that conducts heat more evenly during the heat treatment of a workpiece.

[0004] In order to achieve the above-mentioned objectives, the present invention provides a trolley for a treatment furnace on the one hand, wherein the heat treatment furnace may include a flame nozzle, and the trolley may include a moving mechanism, a refractory layer and a pad mechanism, wherein the moving mechanism includes a moving body and a wheel group connected to the moving body; the refractory layer is arranged on the moving body; the pad mechanism is arranged on the refractory layer, and the pad mechanism includes a plurality of support gaskets that are parallel to each other and of the same height and arranged perpendicular to the direction in which the trolley enters the furnace, and a plurality of support bars arranged on the support gaskets, the support gaskets having a certain thickness in the direction in which the trolley enters the furnace, the plane where the upper surfaces of the plurality of support gaskets are located and the plane where the upper surfaces of the plurality of support bars are located are the same plane, and the same plane is parallel to the ground, and the pad mechanism is a hollow structure.

[0005] In an exemplary embodiment of the heat treatment trolley of the present invention, the refractory layer may include a first refractory sub-layer, a second refractory sub-layer, and a third refractory sub-layer, arranged sequentially from top to bottom. The first refractory sub-layer is composed of at least three layers of clay bricks, the second refractory sub-layer is paved with lightweight insulation bricks, and the third refractory sub-layer is an asbestos layer. Furthermore, the refractory layer also includes a fiber blanket and edge protection castable disposed on the second refractory sub-layer and located on both sides of the first refractory sub-layer along the direction of the trolley entering the furnace.

[0006] In an exemplary embodiment of the heat treatment trolley of the present invention, the vertical distance between the same plane and the upper surface of the refractory layer may be greater than 500 mm.

[0007] In an exemplary embodiment of the heat treatment trolley of the present invention, the flame spray nozzles may be arranged on both sides of the shim bracket and the flame spraying direction of the flame spray nozzles is located between adjacent support pads.

[0008] In an exemplary embodiment of the heat treatment trolley of the present invention, the upper part of the support gasket may be provided with a concave opening, the concave opening is used to place the support bar, and the lower part of the support gasket may be provided with a boss opening, and the concave opening and the boss opening are arranged alternately.

[0009] In an exemplary embodiment of the heat treatment trolley of the present invention, the height difference between the flame nozzle and the workpiece to be heat treated may be greater than 300 mm.

[0010] In an exemplary embodiment of the heat treatment trolley of the present invention, the material of the shim mechanism can be medium silicon heat-resistant ductile iron.

[0011] Another aspect of the present invention provides a method for installing a trolley for a heat treatment furnace, which may include the following steps: cleaning the surface of a moving mechanism for placing a refractory layer; installing the refractory layer; leveling the surface of the refractory layer; installing support gaskets, and then installing support strips and setting the fire port position between adjacent support gaskets during the installation process.

[0012] In an exemplary embodiment of the method for installing a trolley for a heat treatment furnace of the present invention, the leveling of the refractory layer may include a flatness within ±5 mm.

[0013] Another aspect of the present invention provides a heat treatment furnace, which includes the above-mentioned trolley for the heat treatment furnace.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] (1) The trolley of the present invention avoids the traditional use of fire baffles, thereby preventing the workpiece at the fire port from being overburned;

[0016] (2) The arrangement and position of the shim mechanism and the flame nozzle of the present invention enable the flame to pass through the bottom of the workpiece and the pore space in the shim mechanism, forming a convection swirling flame, making heat conduction more uniform, and ensuring that the heat treatment temperature of the workpiece remains consistent;

[0017] (3) The shim mechanism of the present invention can prevent the workpiece to be heat-treated from directly contacting the refractory layer, thereby preventing the workpiece to be heat-treated from damaging the refractory layer and preventing the refractory layer from being frequently repaired and replaced, thereby saving costs;

[0018] (4) The furnace temperature of the heat treatment furnace of the present invention is uniform, and the heat treatment quality of the workpiece is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and other objects and features of the present invention will become more apparent from the following description in conjunction with the accompanying drawings, in which:

[0020] Figure 1 A front view and a top view of a trolley for a heat treatment furnace according to an exemplary embodiment of the present invention are shown;

[0021] Figure 2 A schematic diagram of a support pad according to an exemplary embodiment of the present invention is shown;

[0022] Figure 3 A schematic diagram of a fire-resistant layer according to an exemplary embodiment of the present invention is shown. DETAILED DESCRIPTION

[0023] Hereinafter, a trolley for a heat treatment furnace, an installation method thereof, and a heat treatment furnace according to the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments.

[0024] Figure 1 A front view and a top view of a trolley for a heat treatment furnace according to an exemplary embodiment of the present invention are shown, wherein: Figure 1 (a) is the front view of the trolley. Figure 1 (b) is a top view of the trolley. Figure 2 A schematic diagram of a support pad according to an exemplary embodiment of the present invention is shown; Figure 3 A schematic diagram of a fire-resistant layer according to an exemplary embodiment of the present invention is shown.

[0025] One aspect of the present invention provides a trolley for a heat treatment furnace. In an exemplary embodiment of the trolley for a heat treatment furnace of the present invention, as Figure 1 As shown, the heat treatment furnace may include several flame nozzles 11. The trolley may include a moving mechanism 12 (such as Figure 1 (a) shows), refractory layer 13 and pad iron mechanism 14.

[0026] The moving mechanism 12 can be used to move the trolley. The moving mechanism 12 can include a moving body and a wheel set arranged on the lower surface of the moving body and connected to the moving body. The moving body can be made of metal material. The wheel set can be set as one or more sets. For example, Figure 1 As shown in (a), the wheel set can be set in the middle of the mobile body and can include two sets of wheel sets.

[0027] The fire-resistant layer 13 can be laid on the upper surface of the moving body.

[0028] The shim mechanism 14 is arranged on the upper surface of the refractory layer 13. The shim mechanism 14 is used to place the workpiece to be heat treated. The shim mechanism 14 can be set as an integral hollow structure. The workpiece to be heat treated is arranged on the shim mechanism, and the workpiece can be hoisted as a whole, so that the workpiece is at a certain distance from the surface of the trolley, and a flame nozzle with a certain height difference from the workpiece is arranged. The flame ejected by the flame nozzle can pass through the bottom of the workpiece and the hollow space of the shim mechanism, forming a convective swirling flame, which can make the heat conduction more uniform, thereby ensuring that the heat treatment temperature of the workpiece remains consistent. Figure 1 As shown, the shim mechanism 14 may include a plurality of support pads 14a arranged perpendicular to the direction in which the trolley enters the furnace and a support bar 14b arranged along the direction in which the trolley enters the furnace. The plurality of support pads 14a are arranged parallel to each other and are arranged at the same height. The support pads 14a are arranged with a certain thickness along the direction in which the trolley enters the furnace. Since each support pad is arranged at the same height, the upper surface of each support pad is on the same plane. The support bar 14b is arranged on the upper surface of the support pad 14a. The upper surfaces of the plurality of support bars are also on the same plane. The plane formed by the upper surfaces of the plurality of support pads and the plane formed by the upper surfaces of the plurality of support bars are on the same plane and are parallel to the ground. The upper plane of the support mechanism is parallel to the ground. The above arrangement can ensure that the workpiece to be heat treated is heated evenly during the heat treatment process, and can further ensure that the heat treatment temperature of the workpiece is consistent.

[0029] In this embodiment, the support pad 20 can be as follows Figure 2 As shown. The upper portion of the support gasket may be provided with a plurality of concave openings 21. The plurality of concave openings 21 may be used to place support bars. The lower portion of the support gasket 20 may be provided with a plurality of boss openings 22. The boss openings 22 and the concave openings 21 are arranged alternately. The support gasket arranged as described above can greatly reduce the weight of the support gasket, and the concave shape provided on the upper portion can well install the support bar and facilitate the removal and installation of the support bar.

[0030] The dimensions of the concave openings and the boss openings can be adjusted based on the actual size of the trolley required on site and the size of the workpiece to be heat treated. For example, the distance between adjacent concave openings can be 550 mm to 650 mm (the distance between the centerlines of two adjacent concave openings). The distance between two adjacent boss openings can be 500 mm to 600 mm (the distance between the centerlines of two adjacent boss openings). The distance between the parallel support pads can be set to 1600 mm to 1800 mm.

[0031] In this embodiment, if Figure 3As shown, the refractory layer may include a first refractory sub-layer 1, a second refractory sub-layer 2 and a third refractory sub-layer 3 arranged in sequence from top to bottom. The first refractory sub-layer 1 may be provided with more than 3 layers, for example, it may be 4 layers. The first refractory sub-layer may be composed of clay bricks. The first refractory sub-layer 1 may be built using refractory slurry 4. The second refractory sub-layer 2 may be paved with lightweight insulation bricks. The lightweight insulation bricks may be laid in 2 layers or more. The third refractory layer may be composed of an asbestos layer. Furthermore, the refractory layer may further include a fiber blanket and edge protection castables arranged on the second refractory sub-layer and located on both sides of the first refractory sub-layer along the direction in which the trolley enters the furnace, such as Figure 3 5 and 6 shown in FIG. Figure 3 The wheel drive and installation components are symmetrically arranged at the lower part of the fire-resistant layer.

[0032] In this embodiment, the vertical distance between the upper surface of the support mechanism and the upper surface of the refractory layer can be greater than 500mm, and the height difference between the installed burner nozzle and the workpiece can be greater than 300mm. The coordination of these two heights can ensure that the workpiece has a sufficient heat treatment temperature while it is suspended. Furthermore, the coordination of these heights with the hollow structure of the support mechanism allows the flame to pass through the bottom of the workpiece and the hollow interior of the support mechanism, forming a convection swirling flame that makes heat conduction more uniform, thereby ensuring that the heat treatment temperature of the workpiece remains consistent. Furthermore, the vertical distance between the upper surface of the support mechanism and the upper surface of the refractory layer can be 600mm, and the height difference between the installed burner nozzle and the workpiece can be 350mm.

[0033] In this embodiment, if Figure 1 As shown in Figure (b), the flame nozzle 11 can be installed on both sides of the support structure and between two adjacent support pads. The flame ejected from the flame nozzle is ejected from the space between the support pads, avoiding the need for a traditional flame baffle and preventing the workpiece from overburning at the flame mouth, which would affect the heat treatment quality of the workpiece.

[0034] In this embodiment, the support gasket and the support bar can be made of medium silicon heat-resistant ductile iron (RQTSi5).

[0035] Another aspect of the present invention provides a method for installing a trolley for a heat treatment furnace. In an exemplary embodiment of the method for installing a trolley for a heat treatment furnace of the present invention, the installation method may include:

[0036] S01, clean the surface of the trolley. If the original old trolley is being improved, the refractory brick powder and damaged refractory bricks on the original trolley surface need to be cleaned. If the trolley is newly prepared, no cleaning is required.

[0037] S02, install fire-resistant layer.

[0038] S03: Leveling the refractory layer. The flatness during the leveling process must be maintained within ±5mm. The heat treatment furnace can be baked at a temperature of 550°C to 650°C for 3.5 to 4.5 hours. For example, the temperature can be 600°C for 4 hours.

[0039] S04, Install the support mechanism. During installation, first install the support pads and determine the distance between adjacent support pads, then install the support bars. During installation, avoid the blast hole.

[0040] Another aspect of the present invention provides a heat treatment furnace, which includes the above-mentioned trolley for the heat treatment furnace.

[0041] To sum up, the trolley of the present invention changes the traditional fire baffle, avoiding overburning of the workpiece at the fire mouth; the setting method and position of the shim mechanism and the flame nozzle of the present invention can make the flame pass through the bottom of the workpiece and the pore space in the shim mechanism, forming a convection vortex flame, making heat conduction more uniform, and ensuring that the heat treatment temperature of the workpiece remains consistent; the shim mechanism of the present invention can prevent the workpiece to be heat treated from directly contacting the refractory layer, prevent the workpiece to be heat treated from damaging the refractory layer, prevent the refractory layer from being frequently repaired and replaced, and save costs; the furnace temperature of the heat treatment furnace of the present invention is uniform, and the workpiece heat treatment quality is good.

[0042] Although the present invention has been described above with reference to the exemplary embodiments, it will be apparent to those skilled in the art that various modifications and variations may be made to the exemplary embodiments of the present invention without departing from the spirit and scope defined in the claims.

Claims

1. A trolley for a heat treatment furnace, characterized in that: For heat treatment of bent pipes, the heat treatment furnace includes a flame nozzle, and the trolley includes a moving mechanism, a refractory layer and a pad iron mechanism, wherein: The mobile mechanism includes a mobile body and a wheel set connected to the mobile body; The fire-resistant layer is arranged on the movable body; The shim mechanism is arranged on the refractory layer, and is used to place the workpiece to be heat treated. The shim mechanism includes a plurality of mutually parallel and equal-height support pads arranged perpendicular to the direction in which the trolley enters the furnace, and a plurality of support bars arranged on the support pads along the direction in which the trolley enters the furnace. The support pads have a predetermined thickness along the direction in which the trolley enters the furnace, and the plane on which the upper surfaces of the support pads and the plane on which the upper surfaces of the support bars lie are the same plane, and the same plane is parallel to the ground. The shim mechanism is a hollow structure; The vertical distance between the same plane and the upper surface of the refractory layer is greater than 500 mm; The height difference between the flame nozzle and the workpiece to be heat treated is more than 300 mm; the flame nozzle is arranged on both sides of the shim mechanism and the flame spraying direction of the flame nozzle is located between adjacent support pads; The upper portion of the support gasket is provided with a concave opening for placing the support bar, and the lower portion of the support gasket is provided with a boss opening, and the concave opening and the boss opening are alternately arranged.

2. The trolley for a heat treatment furnace according to claim 1, wherein: The refractory layer includes a first refractory sub-layer, a second refractory sub-layer and a third refractory sub-layer arranged in sequence from top to bottom. The first refractory sub-layer is composed of no less than 3 layers of clay bricks, the second refractory sub-layer is paved with lightweight insulation bricks, and the third refractory sub-layer is an asbestos layer.

3. The trolley for a heat treatment furnace according to claim 2, wherein: The refractory layer further comprises a fiber blanket and an edge protection castable which are arranged on the second refractory sub-layer and are located on both sides of the first refractory sub-layer along the direction in which the trolley enters the furnace.

4. A method for installing a trolley for a heat treatment furnace according to any one of claims 1 to 3, characterized in that: The installation method comprises the following steps: Installation of fire resistant layers; Leveling the surface of the refractory layer; Installing a shim mechanism, wherein the installing shim mechanism includes determining an installation distance between adjacent support washers to install the support washers, and installing the support bars after the support washers are installed; Set the flame nozzle position and set the flame nozzle position between adjacent parallel support pads.

5. The method for installing a trolley for a heat treatment furnace according to claim 4, wherein: The leveling of the refractory layer includes a flatness within ±5mm.

6. A heat treatment furnace, characterized in that: The heat treatment furnace includes the heat treatment furnace trolley according to any one of claims 1 to 3.

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