Furnace bottom roller with heating function

Abstract

The utility model provides a furnace bottom roller with a heating function, which comprises a roller body, an electric heating element is arranged in an inner cavity of the roller body, one side of the roller body is connected with a fixed roller neck, the other side of the roller body is connected with a detachable roller neck, the outer side end of the fixed roller neck is connected with a solid shaft head, and the outer side end of the detachable roller neck is connected with a hollow shaft head. According to the utility model, the heating of a workpiece can be realized through the built-in electric heating element, the heating rate and uniformity are ensured, and the low-temperature and atmosphere heating requirements are met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel plate heat treatment, in particular to a furnace bottom roller with heating function. BACKGROUND

[0002] The roller bottom type heat treatment furnace adopts high-temperature resistant furnace roller to convey workpieces for heating, holding and continuous heat treatment. The common type is straight-through structure, which is commonly used for normalizing, quenching, tempering, annealing and other heat treatment of workpieces. At present, the main heating methods include gas open flame heating, resistance band heating, gas radiation pipe heating and electric radiation pipe heating. The workpieces are supported and conveyed by the furnace bottom roller, and the heating device is arranged above and below the workpieces to realize the heat treatment heating of the workpieces through convection and thermal radiation.

[0003] Analysis of heat transfer characteristics in the furnace: there is no any shielding between the upper heating device and the steel plate, and the upper heating device can directly heat the steel plate through convection and radiation. The lower heating device is installed below the furnace bottom roller, and only the area between the furnace rollers can be directly heated by the heating device through convection and radiation, and the furnace roller shielding area can only heat the furnace roller through the lower heating device, and then indirectly heat the steel plate through the furnace roller by heat conduction or radiation. Due to the different heating principles of the upper and lower surfaces of the steel plate, the heating rate of the upper surface of the steel plate is higher than that of the lower surface under the same furnace temperature condition, and the heating rate and uniformity of the steel plate are very poor under low temperature and indirect heating conditions.

[0004] In order to ensure the heat treatment heating quality, for some medium and low temperature heating scenes, electric heating or gas indirect heating method needs to be adopted, and nitrogen and the like needs to be filled as protective atmosphere. For example, the newly built medium and low temperature roller bottom type tempering furnace in recent years, the heat treatment temperature is generally 150-450℃, which is used for low temperature and medium temperature tempering treatment of high strength steel and wear-resistant plate for engineering machinery. The conventional heating and arrangement method cannot meet the needs of low temperature and atmosphere heating.

[0005] Therefore, it is necessary to provide a furnace bottom roller with heating function to solve the above problems. SUMMARY

[0006] The technical problem to be solved by the utility model lies in providing a furnace bottom roller with heating function in view of the above problems.

[0007] The embodiment of the present application is implemented as follows:

[0008] The embodiment of the present application provides a furnace bottom roller with a heating function, characterized by comprising a roller body, an electric heating element arranged in the internal cavity of the roller body, a fixed roller neck connected to one side of the roller body, and a detachable roller neck connected to the other side of the roller body, wherein the external end of the fixed roller neck is connected to a solid shaft head, the external end of the detachable roller neck is connected to a hollow shaft head, and the heating lead wire of the electric heating element is led out from the hollow shaft head.

[0009] In some optional embodiments, the roller body is provided with a roller ring on the outer wall of the side close to the detachable roller neck, and the roller ring and the detachable roller neck are connected and fastened through a connecting piece.

[0010] In some optional embodiments, the detachable roller neck and the fixed roller neck are both conical shell structures with pointed ends outward, and the inner cavities are filled with heat insulation materials.

[0011] In some optional embodiments, the detachable roller neck and the fixed roller neck are both provided with a stepped portion matched with the end head of the roller body.

[0012] In some optional embodiments, a temperature measuring instrument is arranged on the electric heating element, and the temperature measuring lead wire of the temperature measuring instrument is led out from the hollow shaft head.

[0013] In some optional embodiments, the electric heating element is an axial wave-shaped cage type electric heating core.

[0014] In some optional embodiments, the hollow shaft head is a cylindrical barrel structure filled with insulating materials, and the heating lead wire and the temperature measuring lead wire are both led out from the insulating materials.

[0015] In some optional embodiments, the heating lead wire is provided with an insulating tube.

[0016] In some optional embodiments, the gap between the support disc of the axial wave-shaped cage type electric heating core and the roller body is filled with a heat-resistant fiber blanket.

[0017] In some optional embodiments, one end of the roller body is welded to the fixed roller neck, the fixed roller neck is welded to the solid shaft head, and the detachable roller neck is welded to the hollow shaft head.

[0018] The present application has the following beneficial effects: the furnace bottom roller with a heating function provided by the present application is internally provided with an electric heating element, which can not only be used for workpiece conveying, but also can realize workpiece heating, realize medium and low temperature and atmosphere heating, and realize temperature control through an internal temperature measuring instrument, control steel plate heating rate and heating uniformity, and ensure heat treatment heating quality. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as limiting the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0020] Fig. 1 A sectional view of the furnace bottom roller of the embodiments of the present application;

[0021] Fig. 2 A side view of the hollow shaft head of the embodiments of the present application. DETAILED DESCRIPTION

[0022] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0024] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0025] In the description of the present application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set", "mount", "connect", "connect" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0026] The features and performances of the present application will be further described in the following embodiments.

[0027] As Figs. 1-2As shown, the furnace bottom roller with heating function in the embodiment comprises a roller body 1, an electric heating element 2 arranged in the internal cavity of the roller body, a fixed roller neck 3 connected to one side of the roller body, a detachable roller neck 4 connected to the other side of the roller body, a solid shaft head 5 connected to the outer side end of the fixed roller neck, a hollow shaft head 6 connected to the outer side end of the detachable roller neck, and a heating lead wire 7 of the electric heating element passing out of the hollow shaft head.

[0028] An outer wall of the roller body near the detachable roller neck is provided with a roller ring 8, and the roller ring is connected and fastened with the detachable roller neck through a connecting piece.

[0029] The roller body is a thick-walled pipe structure of heat-resistant steel processed by centrifugal casting, and is connected as a whole with the roller ring and the fixed roller neck by welding, and has strong mechanical properties and anti-creep properties at high temperature.

[0030] The detachable roller neck and the fixed roller neck are both conical shell structures with pointed ends outward, and the inner cavities are filled with heat insulation material 9. The fixed roller neck is connected with the solid shaft head by welding, and the detachable roller neck is connected with the hollow shaft head by welding.

[0031] The detachable roller neck and the fixed roller neck are both provided with a stepped portion, which cooperates with the two end heads of the roller body to improve the installation stability of the overall structure.

[0032] A temperature measuring instrument 10 is arranged on the electric heating element, and a temperature measuring lead wire 11 of the temperature measuring instrument passes out of the hollow shaft head. The temperature measuring instrument is used for temperature control and necessary safety interlocking to ensure heating quality and safety.

[0033] The hollow shaft head is a cylindrical body structure, the inside is filled with insulation material 12, and the heating lead wire and the temperature measuring lead wire both pass out of the insulation material, and the heating lead wire is sleeved with an insulation tube 13.

[0034] Embodiment 1

[0035] The electric heating element in the embodiment is an axial wave-shaped cage type electric heating core, which is obtained by bending an electric resistance wire (strip) into a "U" shape and inserting it into a plurality of high-temperature-resistant ceramic support plates, and a heat-resistant rod is used for fixation. The gap between the ceramic support plates and the roller body is tightly filled with heat-resistant fiber blanket, which has the functions of fixation and shock absorption.

Claims

1. A furnace bottom roller with heating function, characterized in that, The roller body includes an electric heating element installed in the internal cavity of the roller body. A fixed roller neck is connected to one side of the roller body, and a detachable roller neck is connected to the other side. A solid shaft head is connected to the outer end of the fixed roller neck, and a hollow shaft head is connected to the outer end of the detachable roller neck. The heating lead wire of the electric heating element passes through the hollow shaft head.

2. A furnace bottom roller with heating function according to claim 1, characterized in that, The outer wall of the roller body near the detachable roller neck is provided with a roller ring, and the roller ring is connected and fastened to the detachable roller neck by a connector.

3. A furnace bottom roller with heating function according to claim 1 or 2, characterized in that, Both the detachable and fixed roller necks are conical shell structures with the pointed end facing outwards, and the inner cavity is filled with heat insulation material.

4. A furnace bottom roller with heating function according to claim 3, characterized in that, Both the detachable and fixed roller necks are provided with stepped portions, which cooperate with the two ends of the roller body.

5. A furnace bottom roller with heating function according to claim 4, characterized in that, A temperature measuring instrument is installed on the electric heating element, and the temperature measuring lead wire of the temperature measuring instrument passes through the hollow shaft head.

6. A furnace bottom roller with heating function according to claim 5, characterized in that, The electric heating element is an axially corrugated cage-type electric heating core.

7. A furnace bottom roller with heating function according to claim 5 or 6, characterized in that, The hollow shaft head has a cylindrical structure filled with insulating material, and the heating lead wire and the temperature measuring lead wire both pass through the insulating material.

8. A furnace bottom roller with heating function according to claim 7, characterized in that, The heating lead wire is fitted with an insulating tube.

9. A furnace bottom roller with heating function according to claim 6, characterized in that, The gap between the support plate of the axial corrugated cage-type electric heating core and the roller body is filled with a heat-resistant fiber blanket.

10. A furnace bottom roller with heating function according to claim 8, characterized in that, One end of the roller body is welded to the fixed roller neck, the fixed roller neck is welded to the solid shaft head, and the detachable roller neck is welded to the hollow shaft head.

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