Raw material annealing furnace for screw production

Abstract

The utility model discloses a raw material annealing furnace for screw production, including outer furnace body, furnace cover and rotation hoisting device, be equipped with inner furnace body in the outer furnace body, and form annular air channel between the outer furnace body inner side wall and the outer side wall of inner furnace body, the inner bottom portion of outer furnace body is installed with heating coil, and the inner side wall of outer furnace body is installed with several heating resistance bands, the inner top of furnace cover is fixed with installation cylinder, and installation cylinder is connected with circulating fan and fairing in proper order under, this fairing stretches into inner furnace body, install motor on the furnace cover, and the motor is connected with the impeller of circulating fan through the transmission shaft, the inner wall of inner furnace body is evenly distributed with several guide vanes that lean to the axis, and the bottom of inner furnace body is equipped with the flow -equalizing plate of open -work. The utility model discloses through the circulating fan of furnace top and conical fairing, cooperate the flow guide plate of furnace wall and the flow -equalizing plate of furnace bottom, form forced convection heat cycle in the furnace, solved the problem of traditional annealing furnace temperature distribution uneven.

Description

Technical Field

[0001] This utility model relates to the field of screw manufacturing technology, and in particular to a raw material annealing furnace for screw manufacturing. Background Technology

[0002] Before production, screws require heat treatment of the steel in a spheroidizing annealing furnace to improve the processing performance of the raw materials, enhance the mechanical properties of the screws, reduce the risk of cracking during processing, and ensure the stability of product quality.

[0003] Currently, traditional spheroidizing annealing furnaces have a simple heating element layout, a large temperature difference between the furnace edge and center, and natural convection of hot air flow leading to temperature stratification, with the lower layer having a lower temperature. Uneven material density can also cause local overheating or underheating. All of these problems can lead to uneven temperature distribution during heat treatment, thus affecting the processing quality.

[0004] To address these issues, we propose a raw material annealing furnace for screw production. Utility Model Content

[0005] The purpose of this invention is to provide a raw material annealing furnace for screw production, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An annealing furnace for raw materials used in screw production includes an outer furnace body, a furnace cover, and a rotating lifting device. An inner furnace body is located within the outer furnace body, and an annular air passage is formed between the inner sidewall of the outer furnace body and the outer sidewall of the inner furnace body. A heating coil is installed at the inner bottom of the outer furnace body, and several heating resistance strips are installed on the inner sidewall of the outer furnace body. An installation cylinder is fixed to the inner top surface of the furnace cover, and a circulating fan and a flow guide are sequentially connected below the installation cylinder. The flow guide extends into the inner furnace body. A motor is installed on the furnace cover, and the motor is connected to the impeller of the circulating fan via a drive shaft. Several flow guide plates inclined towards the axis are evenly distributed on the inner wall of the inner furnace body, and a perforated flow equalization plate is provided at the bottom of the inner furnace body.

[0008] In a further embodiment, thermocouples are installed at the four corners of the bottom, the four corners of the middle inner wall, and the four corners of the upper inner wall of the inner furnace body.

[0009] In a further embodiment, the mounting cylinder and the circulating fan, as well as the circulating fan and the guide shroud, are connected by flanges.

[0010] In a further embodiment, the fairing adopts a conical structure that is narrower at the top and wider at the bottom.

[0011] In a further embodiment, the tilt angle of the deflector is 15-45°.

[0012] In a further embodiment, the flow equalization plate is supported by several support columns between itself and the bottom of the outer furnace body, and the support columns and the through holes on the surface of the flow equalization plate are distributed alternately.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This invention, by setting up a circulating fan and a conical guide hood on the furnace top, along with guide plates on the furnace wall and flow equalization plates at the furnace bottom, allows hot air to be blown into the furnace by the circulating fan, and guided by the guide plates to the central area of ​​the furnace. Finally, it flows through the flow equalization plates into the annular air passage and is evenly drawn into the air inlet by the circulating fan, thus forming a forced convection heat circulation in the furnace, solving the problem of uneven temperature distribution in traditional annealing furnaces. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the half-section structure of the furnace body of this utility model;

[0017] Figure 3 This is a schematic diagram of the internal structure of the furnace cover of this utility model.

[0018] In the diagram: 1. Outer furnace body; 2. Furnace cover; 3. Rotary lifting device; 4. Inner furnace body; 5. Heating coil; 6. Heating resistance strip; 7. Mounting cylinder; 8. Circulating fan; 9. Motor; 10. Drive shaft; 11. Flow guide shroud; 12. Flow guide plate; 13. Flow equalization plate; 14. Support column. Detailed Implementation

[0019] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1-3 An annealing furnace for raw materials used in screw production includes an outer furnace body 1, a furnace cover 2, a rotary lifting device 3, and an inner furnace body 4. The outer furnace body 1 is a cylindrical structure made of Q345R steel plate and lined with ceramic fiber modules. The inner furnace body 4 is coaxially nested inside the outer furnace body 1 and is made of 310S stainless steel. The gap between the two forms an annular air passage. The furnace cover 2 covers the outer furnace body 1 and moves by lifting and rotating through the rotary lifting device 3. The rotary lifting device 3 is consistent with the prior art and mainly includes a hydraulic lifting structure, a rotating structure, and a chain lifting structure.

[0023] A heating coil 5 is installed at the bottom inner part of the outer furnace body 1. The heating coil 5 is made of Cr20Ni80 resistance alloy wire and is used for main heating. Several heating resistance strips 6 are installed on the inner sidewall of the outer furnace body 1. The heating resistance strips 6 are distributed along the axial direction of the outer furnace body 1 and are divided into upper, middle and lower zones with independent temperature control for auxiliary heating. Specifically, thermocouples are installed at the four corners of the bottom inner part, the four corners of the middle inner wall, and the four corners of the upper inner wall of the inner furnace body 4. The thermocouples are connected to an external temperature control system. An installation cylinder 7 is welded and fixed to the inner top surface of the furnace cover 2. The circumferential sidewall of the installation cylinder 7 is hollowed out, and a circulating fan 8 is connected to the bottom of the installation cylinder 7 through a flange. A conical guide shroud 11 with a narrow top and wide bottom is connected to the bottom of the circulating fan 8 through a flange. The guide shroud 11 extends into the furnace body. A motor 9 is fixedly installed on the upper port of the inner furnace body 4 and the furnace cover 2. The motor 9 is connected to the impeller of the circulating fan 8 through the transmission shaft 10. The transmission shaft 10 passes through the furnace cover 2 and is sealed with packing. Several guide plates 12 inclined towards the axis are evenly distributed on the inner wall of the inner furnace body 4. The guide plates 12 are welded to the inner wall of the inner furnace body 4 and arranged in five layers along the height direction, with four groups in each layer. The guide plates 12 of adjacent layers are staggered and inclined at 30° towards the axis. The bottom of the inner furnace body 4 is provided with a hollow flow equalization plate 13 with an opening rate of 50% and made of 253MA heat-resistant steel. The flow equalization plate 13 is supported by several support columns 14 between it and the bottom of the outer furnace body 1. The positions of the through holes on the surface of the support columns 14 and the flow equalization plate 13 are staggered to avoid blocking the airflow.

[0024] Work process: Loading: The rotary lifting device 3 lifts and removes the furnace cover 2 from above the outer furnace body 1, puts the wire into the inner furnace body 4, closes the furnace cover 2, the heating coil 5 starts for main heating, the side wall heating resistance band 6 provides auxiliary heating in the middle zone, the circulating fan 8 starts, the airflow blows vertically down along the guide shroud 11, deflects horizontally through the guide plate 12, penetrates the material layer, then flows evenly through the flow equalization plate 13, and then rises through the annular air passage and returns to the fan inlet. Throughout the process, thermocouples provide real-time feedback, and PID adjusts the power of each heating zone.

[0025] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0026] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An annealing furnace for raw materials used in screw production, comprising an outer furnace body (1), a furnace cover (2), and a rotary lifting device (3), characterized in that: The outer furnace body (1) is provided with an inner furnace body (4), and an annular air passage is formed between the inner side wall of the outer furnace body (1) and the outer side wall of the inner furnace body (4). A heating coil (5) is installed at the inner bottom of the outer furnace body (1), and several heating resistance strips (6) are installed on the inner side wall of the outer furnace body (1). An installation cylinder (7) is fixed on the inner top surface of the furnace cover (2), and a circulating fan (8) and a flow guide (11) are connected in sequence below the installation cylinder (7). The flow guide (11) extends into the inner furnace body (4). A motor (9) is installed on the furnace cover (2), and the motor (9) is connected to the impeller of the circulating fan (8) through a transmission shaft (10). Several flow guides (12) inclined towards the axis are evenly distributed on the inner wall of the inner furnace body (4), and a hollow flow equalization plate (13) is provided at the bottom of the inner furnace body (4).

2. The annealing furnace for raw materials in screw production according to claim 1, characterized in that: Thermocouples are installed at the four corners of the bottom, the four corners of the middle section of the inner wall, and the four corners of the upper section of the inner furnace body (4).

3. The annealing furnace for raw materials in screw production according to claim 1, characterized in that: The mounting cylinder (7) and the circulating fan (8) are connected by flanges, as are the circulating fan (8) and the guide shroud (11).

4. The annealing furnace for raw materials in screw production according to claim 1, characterized in that: The air deflector (11) adopts a conical structure that is narrow at the top and wide at the bottom.

5. The annealing furnace for raw materials in screw production according to claim 1, characterized in that: The tilt angle of the guide plate (12) is 15-45°.

6. The annealing furnace for raw materials in screw production according to claim 1, characterized in that: The flow equalization plate (13) is supported by several support columns (14) at the bottom of the outer furnace body (1), and the through holes on the surface of the support columns (14) and the flow equalization plate (13) are staggered.

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