A long bar hot shear furnace for guide rail shearing

Abstract

This disclosure relates to the technical field of machining equipment. One embodiment of this disclosure provides a hot shearing furnace for long bars used in guide rail shearing, comprising: an outer shell and an outer frame, the outer frame being fixed to the outside of the outer shell, a cutting assembly being disposed on the outer frame, inlets and outlets being respectively opened on both sides of the outer shell, and a conveying and heating assembly being disposed inside the outer shell. The conveying and heating assembly includes an inner frame, which is fixed inside the outer shell. Several conveying rollers are rotatably connected to both the inner and outer frames, some of which are electrically driven to rotate. Several annular heating tubes are installed inside the inner frame. This technical solution solves the technical problem of poor heating uniformity in existing hot shearing furnaces, which leads to temperature differences in the heated bars.

Description

Technical Field

[0001] The embodiments disclosed herein relate to the technical field of machining equipment, and more specifically, to a long bar hot shearing furnace for guide rail shearing. Background Technology

[0002] In the production process of guide rails (such as elevator guide rails and machine tool guide rails), the long bar hot shearing furnace is the core equipment for pre-treatment of long metal bars. The long bars need to be heated to a specific temperature (to facilitate subsequent shearing and shaping), and then cut into shorter pieces suitable for processing by a shearing mechanism. The heating effect and shearing quality directly determine the structural accuracy of the finished guide rail. With increasing requirements for material uniformity and cross-sectional regularity in guide rails, the shortcomings of traditional long bar hot shearing furnaces used for guide rail shearing are becoming increasingly apparent: existing hot shearing furnaces generally suffer from poor heating uniformity and lack of support at the cut point during hot shearing, seriously affecting the quality of guide rail processing and increasing the cost of subsequent processes. Traditional hot shearing furnaces for long bars often employ single-sided or localized heating structures, making it difficult to conduct heat evenly within the long bar stock. During heating, significant temperature differences easily form between the bar surface and core, and between the ends and the middle region, resulting in uneven heating. This not only affects the consistency of material plasticity during subsequent shearing but may also cause bending deformation due to thermal stress, requiring additional straightening processes. Although some hot shearing furnaces have attempted to optimize the layout of heating elements, the lack of a dynamic temperature control mechanism still makes it difficult to ensure uniform heating of bars of different specifications.

[0003] Therefore, the development of a long bar hot shearing furnace with uniform heating and cutting support function has become an urgent need to improve the quality and efficiency of guide rail processing. Utility Model Content

[0004] To overcome the above-mentioned defects, the embodiments of this disclosure provide a long bar hot shearing furnace for guide rail shearing, which solves the technical problem that existing hot shearing furnaces generally have poor heating uniformity, resulting in temperature differences in the bar stock after heating.

[0005] According to one aspect, at least one embodiment of this disclosure provides a long bar hot shear furnace for guide rail shearing, comprising: The outer casing and the outer frame, wherein the outer frame is fixed to the outside of the outer casing; A cutting assembly, which is mounted on the outer frame; A pair of inlets and outlets and a conveying heating component, wherein the inlets and outlets are respectively opened on both sides of the housing, and the conveying heating component is disposed inside the housing; The conveying and heating assembly includes an inner frame, which is fixed inside the outer shell. Several conveying rollers are rotatably connected to both the inner frame and the outer frame, and some of the conveying rollers are driven to rotate by electricity. Several annular heating tubes are installed inside the inner frame.

[0006] As a further technical solution, the annular heating tubes are all located at the center of the interval between the conveying rollers, and several pairs of through holes are opened at both ends of the bottom of the inner frame. A pair of telescopic cylinders are horizontally arranged at the lower ends of both sides of the inner frame.

[0007] As a further technical solution, the output end of the telescopic cylinder is connected to a base frame, which is located on both sides of the bottom of the inner frame. Several stabilizing clamps are rotatably connected to the base frame through the through hole.

[0008] According to another aspect, in at least one embodiment of the present invention, the cutting assembly includes a gantry frame fixed to the top of the housing, a telescopic hydraulic cylinder is provided on the top of the gantry frame, and a hot cutting blade holder is provided at the output end of the telescopic hydraulic cylinder.

[0009] As a further technical solution, the hot cutting tool holder is provided with stabilizing rods at both ends of the top. The upper end of the stabilizing rod is movably fitted into the gantry frame. The gantry frame is horizontally installed on both sides. The output end of the second cylinder is provided with a clamping frame. The top of the clamping frame has a downward-facing slit.

[0010] As a further technical solution, the front end of the clamping frame is C-shaped, and the width of the slit opening matches the thickness of the hot cutting blade holder.

[0011] As a further technical solution, a feeding support roller is provided on the outer side of the outer shell, and the surfaces of the feeding support roller and the conveying roller are both structural surfaces inclined towards the center.

[0012] As a further technical solution, the hot cutting tool holder is fixedly connected to the output end of the telescopic hydraulic cylinder and the stabilizer bar by bolts.

[0013] The beneficial effects of the embodiments disclosed herein are as follows: In this disclosure, the conveying heating assembly solves the problems of uneven heating and bar stock displacement in traditional hot shearing furnaces through annular heating and multi-directional material stabilization design. The annular heating tube surrounds the bar stock 360° for heating, and the progressive layout ensures consistent temperature throughout the bar stock, preventing thermal stress deformation. The inclined surfaces of the conveying rollers and feed support rollers automatically center the bar stock, while stabilizing clamps from both sides provide omnidirectional limiting, preventing displacement during heating and conveying. This structure eliminates the need for manual adjustment of the bar stock position, significantly improving heating uniformity, providing uniform raw materials for subsequent shearing, reducing subsequent straightening processes, and meeting the high precision requirements of guide rail processing. Furthermore, continuous conveying and heating seamlessly integrate, improving overall production efficiency. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments of this disclosure will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this disclosure and these drawings without any creative effort.

[0015] Figure 1 This is a schematic diagram of a structure in one embodiment of the present disclosure; Figure 2 This is an isometric drawing of the present disclosure; Figure 3 This is another isometric view of the present disclosure; Figure 4 This is an isometric sectional view of the present disclosure; In the diagram: 1. Outer shell; 2. Outer frame; 3. Inlet / outlet; 4. Conveying and heating assembly; 4-1. Inner frame; 4-2. Conveying roller; 4-3. Heating tube; 4-4. Through hole; 4-5. Telescopic cylinder; 4-6. Base frame; 4-7. Stabilizing clamp; 5. Cutting assembly; 5-1. Gantry frame; 5-2. Telescopic hydraulic cylinder; 5-3. Hot cutting blade holder; 5-4. Stabilizing bar; 5-5. Second cylinder; 5-6. Clamping frame; 5-7. Cutting notch; 6. Feed support roller. Detailed Implementation

[0016] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present disclosure and are not intended to limit the scope of the disclosure.

[0017] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0018] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0019] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0020] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0021] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0022] like Figures 1-4 As shown, it illustrates a long bar hot shearing furnace for guide rail shearing according to an embodiment of the present disclosure, comprising: The outer casing 1 and the outer frame 2 are fixed to the outside of the outer casing 1; Cutting assembly 5, which is disposed on the outer frame 2; A pair of inlets and outlets 3 and a conveying heating component 4 are provided. The inlets and outlets 3 are respectively opened on both sides of the outer shell 1, and the conveying heating component 4 is disposed inside the outer shell 1. The conveying heating assembly 4 includes an inner frame 4-1, which is fixed inside the outer shell 1. Several conveying rollers 4-2 are rotatably connected to both the inner frame 4-1 and the outer frame 2. Some of the conveying rollers 4-2 are electrically driven to rotate. Several annular heating tubes 4-3 are installed inside the inner frame 4-1. The annular heating tubes 4-3 are all located at the center of the interval between the conveying rollers 4-2. Several pairs of through holes 4-4 are opened at both ends of the bottom of the inner frame 4-1. A pair of telescopic cylinders 4-5 are horizontally arranged at the lower ends of both sides of the inner frame 4-1. The output end of the telescopic cylinders 4-5 is connected to a base frame 4-6. The base frame 4-6 is located on both sides of the bottom of the inner frame 4-1. Several stabilizing clamps 4-7 are rotatably connected to the base frame 4-6 through the through holes 4-4.

[0023] In some examples, to achieve stable conveying and uniform heating of long bars for the guide rail, and to avoid uneven heating or insufficient heating due to bar conveying deviation, which would affect the subsequent shearing quality, a conveying heating assembly 4 is designed. This assembly includes an inner frame 4-1 fixed inside the outer shell 1 and several conveying rollers 4-2 rotatably connected to the outer frame 2, forming a continuous conveying channel. Individual electrically driven conveying rollers 4-2 drive the other conveying rollers 4-2 to operate synchronously through friction. After the bar is placed on the conveying rollers 4-2, it is smoothly conveyed to the heating area inside the outer shell 1. The spacing of the conveying rollers 4-2 is adapted to the diameter of the bar, providing multi-point support for the bar from below, preventing the bar from sagging or deviating due to its own weight during conveying, and ensuring that the bar moves accurately along the axial direction.

[0024] Several annular heating tubes 4-3 installed inside the inner frame 4-1 are located at the center of the interval between the conveying rollers 4-2. The annular structure can heat the bar from the outer periphery in 360°, avoiding the excessive temperature difference between the inside and outside of the bar caused by traditional unidirectional heating, ensuring that the overall temperature of the bar is uniform and consistent, and meeting the temperature requirements of the guide rail processing for material heat treatment.

[0025] Multiple annular heating tubes 4-3 are evenly distributed along the conveying direction, which can realize segmented progressive heating of the bar stock, so that the bar stock is gradually heated from room temperature to the target shear temperature, reducing the internal stress caused by sudden heating and avoiding bar stock deformation.

[0026] Telescopic cylinders 4-5 at both ends of the bottom of the inner frame 4-1 drive the base frame 4-6 to rise and fall. The stabilizing clamping rod 4-7, which passes through the through hole 4-4 on the base frame 4-6, moves with the base frame 4-6. When the bar stock is being conveyed, the telescopic cylinders 4-5 push the base frame 4-6 to rise, and the stabilizing clamping rod 4-7 comes into contact with the surface of the bar stock from both sides. Together with the conveying roller 4-2, it forms upper and lower and lateral limiting support, forming an all-round material stabilization structure to prevent the bar stock from shifting due to thermal expansion or vibration during the heating process. After heating is completed, the stabilizing clamping rod 4-7 returns to its original position as the base frame 4-6 falls, without affecting the conveying of the bar stock to the cutting area. The through hole 4-4 provides a lifting guide for the stabilizing clamping rod 4-7, ensuring that the clamping rod is always aligned with both sides of the bar stock when it moves, thus improving the accuracy of material stabilization.

[0027] During operation, the conveying roller 4-2 carries the bar stock into the heating zone, the annular heating tube 4-3 heats it evenly, and the stabilizing clamp 4-7 clamps the bar stock to prevent deviation. After heating, the clamp returns to its original position, and the bar stock is conveyed to the cutting assembly 5. The roller conveyor ensures stable operation, the annular heating ensures uniform heating, and the clamp stabilizes the material to prevent deviation. All components work together to achieve stable conveying and uniform heating of the bar stock, meeting the requirements of hot shearing pretreatment.

[0028] like Figures 1-4As shown, this embodiment proposes that the cutting assembly 5 includes a gantry frame 5-1, which is fixed to the top of the outer shell 1. A telescopic hydraulic cylinder 5-2 is provided on the top of the gantry frame 5-1, and a hot cutting blade holder 5-3 is provided at the output end of the telescopic hydraulic cylinder 5-2. Stabilizing rods 5-4 are provided at both ends of the top of the hot cutting blade holder 5-3. The upper end of the stabilizing rod 5-4 is movably fitted inside the gantry frame 5-1. Second cylinders 5-5 are horizontally installed on both sides of the gantry frame 5-1. A clamping frame 5-6 is provided at the output end of the second cylinder 5-5. A cutting slit 5-7 is opened downward at the top of the clamping frame 5-6.

[0029] In some examples, in order to achieve clamping and flat cutting of the heated bar stock, and to prevent the bar stock from shaking during cutting, causing the cut 5-7 to be skewed, or the cutter to deviate and affect the quality of the cut surface, a cutting assembly 5 is designed. This assembly includes a gantry frame 5-1 fixed to the top of the housing 1 to provide installation support for the cutting structure. Second cylinders 5-5, which are horizontally installed on both sides of the gantry frame 5-1, drive the clamping frame 5-6 to move relative to each other. After the bar stock is heated, it is transported to the cutting position. The second cylinders 5-5 push the clamping frame 5-6 to fit against both sides of the bar stock at the cutting point, firmly clamping the bar stock laterally, preventing the bar stock from shifting or rotating due to force during the cutting process, and providing a stable foundation for flat cutting.

[0030] The downward-facing cut 5-7 at the top of the clamping frame 5-6 provides a moving channel for the hot cutting blade holder 5-3, ensuring that the cutting blade holder can be accurately aligned with the cutting position.

[0031] The output end of the telescopic hydraulic cylinder 5-2 at the top of the gantry frame 5-1 is connected to the hot cutting blade holder 5-3. The hydraulic drive can provide a stable and powerful cutting force, which is suitable for the shearing requirements of the heated bar stock and avoids incomplete cutting or rough cut 5-7 due to insufficient power.

[0032] The stabilizing bars 5-4 at both ends of the top of the hot cutting blade holder 5-3 are movably fitted inside the gantry frame 5-1 and rise and fall synchronously with the hot cutting blade holder 5-3. The stabilizing bars 5-4 can limit the movement trajectory of the hot cutting blade holder 5-3, prevent the blade holder from tilting or deviating when it descends to cut, ensure that the cutter acts vertically on the cutting surface of the bar stock, and further improve the flatness of the cut 5-7.

[0033] During cutting, clamping frame 5-6 clamps the bar stock, and telescopic hydraulic cylinder 5-2 drives hot cutting blade holder 5-3 to descend along the guide bar 5-4, passing through the cutting opening 5-7 of clamping frame 5-6 to cut the bar stock; after cutting, hot cutting blade holder 5-3 rises and resets, clamping frame 5-6 is released, facilitating the discharge of the cut bar stock.

[0034] During operation, clamping frame 5-6 clamps the bar stock, and hot cutting blade holder 5-3 descends along stabilizing rod 5-4 to cut it. Cylinder clamping ensures precise positioning, hydraulic cutter provides sufficient power, and guide limit ensures smooth cutting. All components work together to achieve bar stock clamping and flat cutting, meeting the high-quality requirements of guide rail shearing.

[0035] For example, such as Figure 3 As shown, the front ends of the clamping frames 5-6 are all C-shaped structures, and the opening width of the slit 5-7 matches the thickness of the hot cutting blade holder 5-3.

[0036] In some examples, the front end of the clamping frame 5-6 has a C-shaped structure. Its curved inner wall can fit tightly against the outer periphery of the bar stock, increasing the clamping contact area and improving the clamping stability of the bar stock, preventing the bar stock from slipping out of the clamping frame 5-6 during cutting. At the same time, the C-shaped structure can adapt to bars of different diameters, enhancing the versatility of the component. The opening width of the slit 5-7 matches the thickness of the hot cutting blade holder 5-3, ensuring that the hot cutting blade holder 5-3 accurately passes through the slit 5-7, avoiding blade deviation due to excessive gap.

[0037] For example, such as Figure 2 As shown, a feeding support roller 6 is provided on the outer side of the outer shell 1. The surfaces of the feeding support roller 6 and the conveying roller 4-2 are both structural surfaces that are inclined towards the center.

[0038] In some examples, the surfaces of the feed support roller 6 and the conveying roller 4-2 on the outer side of the outer casing 1 are both inclined towards the center. The inclined surface can automatically center and guide the bar stock. When the bar stock is placed on the roller surface, it will automatically adjust to the center position of the roller group under the guidance of the inclined surface, preventing the bar stock from shifting to the sides during conveying. The feed support roller 6 can receive external feeding and form a continuous centering guide channel with the conveying roller 4-2, ensuring that the bar stock moves accurately along the axis from feeding to heating, providing a stable posture for the 360° uniform heating of the annular heating tube 4-3, and ensuring the heating uniformity of the conveying heating component 4.

[0039] For example, such as Figure 3 As shown, the hot cutting tool holder 5-3 is fixedly connected to the output end of the telescopic hydraulic cylinder 5-2 and the stabilizer rod 5-4 by bolts.

[0040] In some examples, the hot-cutting blade holder 5-3 is bolted to the output end of the telescopic hydraulic cylinder 5-2 and the stabilizer bar 5-4. The removability of the bolted connection facilitates the installation, replacement, and maintenance of the hot-cutting blade holder 5-3. When the cutter wears out or needs to be adapted to different specifications of bar stock, the bolts can be quickly removed to replace the blade holder, reducing equipment downtime.

[0041] In actual use: The long bar is placed on the feed support roller 6 on the outside of the outer shell 1. The inclined roller surface guides the bar to automatically center. The conveying heating component 4 is activated, and the electrically driven conveying roller 4-2 carries the bar into the interior of the outer shell 1 through the inlet and outlet 3. The telescopic cylinders 4-5 on both sides of the inner frame 4-1 push the base frame 4-6 to rise. The stabilizing clamping rod 4-7 passes through the through hole 4-4 and clamps the bar from both sides to prevent conveying deviation. The annular heating tube 4-3 inside the inner frame 4-1 heats the bar evenly, with multiple heating tubes 4-3 progressively heating along the conveying direction. After heating is completed, the stabilizing clamping rod 4-7 descends and resets with the base frame 4-6, and the conveying roller 4-2 delivers the bar to below the cutting component 5. The second cylinder 5-5 is activated, pushing the C-shaped clamping frame 5-6 to clamp the bar at the cutting point from both sides. The telescopic hydraulic cylinder 5-2 drives the hot cutting blade 5-3 to descend along the guide of the stabilizing rod 5-4, passing through the cutting opening 5-7 of the clamping frame 5-6 to complete the cutting. After shearing, the hot cutting tool holder 5-3 rises, the clamping frame 5-6 loosens, and the cut bar is discharged with the conveying roller 4-2. At the same time, new bar is continuously fed in for heating, realizing continuous processing.

[0042] It should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and are not intended to limit it. Although this disclosure has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this disclosure without departing from the spirit and scope of the technical solutions of this disclosure, and all such modifications and substitutions should be covered within the scope of the claims of this disclosure.

Claims

1. A long bar hot shear furnace for rail shearing, characterized in that, include: The outer shell (1) and the outer frame (2) are fixed to the outside of the outer shell (1); A cutting assembly (5) is disposed on the outer frame (2); A pair of inlets and outlets (3) and a conveying heating assembly (4) are provided, wherein the inlets and outlets (3) are respectively opened on both sides of the outer shell (1), and the conveying heating assembly (4) is disposed inside the outer shell (1); The conveying heating assembly (4) includes an inner frame (4-1), which is fixed inside the outer shell (1). Several conveying rollers (4-2) are rotatably connected to both the inner frame (4-1) and the outer frame (2). Some of the conveying rollers (4-2) are driven to rotate by electricity. Several annular heating tubes (4-3) are installed inside the inner frame (4-1).

2. A long bar hot shear furnace for shear cutting of a guide rail according to claim 1, wherein The annular heating tubes (4-3) are all located at the center of the interval between the conveying rollers (4-2). Several pairs of through holes (4-4) are opened at both ends of the bottom of the inner frame (4-1). A pair of telescopic cylinders (4-5) are horizontally arranged at the lower ends of both sides of the inner frame (4-1).

3. A long bar hot shear for rail shearing as claimed in claim 2 wherein, The output end of the telescopic cylinder (4-5) is connected to a base frame (4-6). The base frame (4-6) is located on both sides of the bottom of the inner frame (4-1). Several stabilizing clamps (4-7) are rotatably connected to the base frame (4-6) through the through hole (4-4).

4. A long bar hot shearing furnace for guide rail shearing according to claim 1, characterized in that, The cutting assembly (5) includes a gantry frame (5-1), which is fixed to the top of the outer shell (1). A telescopic hydraulic cylinder (5-2) is provided on the top of the gantry frame (5-1), and a hot cutting blade holder (5-3) is provided at the output end of the telescopic hydraulic cylinder (5-2).

5. A long bar hot shearing furnace for guide rail shearing according to claim 4, characterized in that, The hot cutting blade holder (5-3) is equipped with stabilizing rods (5-4) at both ends of the top. The upper end of the stabilizing rod (5-4) is movably fitted into the gantry frame (5-1). The gantry frame (5-1) is equipped with second cylinders (5-5) horizontally on both sides. The output end of the second cylinder (5-5) is equipped with a clamping frame (5-6). The top of the clamping frame (5-6) is provided with a downward-facing slit (5-7).

6. A long bar hot shearing furnace for guide rail shearing according to claim 5, characterized in that, The front ends of the clamping frames (5-6) are all C-shaped structures, and the opening width of the slit (5-7) matches the thickness of the hot cutting blade holder (5-3).

7. A long bar hot shearing furnace for guide rail shearing according to claim 1, characterized in that, The outer side of the outer shell (1) is provided with a feeding support roller (6), and the surfaces of the feeding support roller (6) and the conveying roller (4-2) are both structural surfaces inclined towards the center.

8. A long bar hot shearing furnace for guide rail shearing according to claim 5, characterized in that, The hot cutting tool holder (5-3) is fixedly connected to the output end of the telescopic hydraulic cylinder (5-2) and the stabilizer bar (5-4) by bolts.

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