Low temperature heating zone structure for an electrically heated roller hearth kiln

Abstract

This utility model discloses a low-temperature heating zone structure for an electrically heated roller kiln, including multiple low-temperature heating sections, a fan, heating rods for heating the billets, and rollers for conveying the billets. The heating rods and rollers are placed within their respective low-temperature heating sections and arranged along the conveying direction of the billets. The heating rods are positioned above and below their respective rollers. A circulating air duct is provided above the rollers, and this circulating air duct has a turning section. The fan is located within the turning section of the circulating air duct. This utility model provides a circulating air duct above the rollers conveying the billets in the low-temperature heating zone of the electrically heated roller kiln, generating circulating airflow in this area. This enhances the convective heat transfer between the airflow and the billets, improves the heating efficiency of the billets, and results in more uniform heating of the billets, thus improving product quality.

Description

Technical Field

[0001] This utility model relates to the technical field of electrically heated roller kilns, and in particular to a low-temperature heating zone structure for an electrically heated roller kiln. Background Technology

[0002] Electrically heated roller kilns are widely used in the firing processes of materials such as ceramics and glass. They primarily heat the blanks on the rollers through thermal radiation generated by electric heating rods. However, existing electrically heated roller kilns have the following problems in the low-temperature heating zone.

[0003] In the low-temperature heating zone, the thermal radiation heating efficiency of the heating rods is relatively low. This is mainly because the intensity and transfer efficiency of thermal radiation are not as good at low temperatures as at high temperatures, resulting in a slower heating rate of the billet. This slow heating process not only prolongs the preheating time and reduces production efficiency, but may also affect the preheating quality of the billet, thus adversely affecting the subsequent firing process.

[0004] Furthermore, it is difficult to achieve perfect uniformity in the manufacturing process of heating rods, resulting in some resistance unevenness. This resistance unevenness leads to inconsistent heat generation at different locations when the heating rod is energized, causing uneven heating of the billet. Unevenly heated billets are prone to defects such as deformation and cracking during subsequent firing, severely affecting product quality and yield.

[0005] Therefore, existing electric heating roller kilns have pressing problems in terms of heating efficiency and uniformity in the low-temperature heating zone. An improved low-temperature heating zone structure is needed to improve the heating efficiency and heating uniformity of the green body in order to meet the requirements of high-quality firing production. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a low-temperature heating zone structure for an electrically heated roller kiln, which can improve the heating efficiency of the low-temperature heating zone and the heating uniformity of the billet.

[0007] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0008] A low-temperature heating zone structure for an electrically heated roller kiln includes multiple low-temperature heating sections, a fan, electric heating rods for heating the billets, and rollers for conveying the billets.

[0009] The heating rods and rollers are both placed in the corresponding low-temperature heating sections and are arranged along the conveying direction of the billet.

[0010] The heating rods are respectively placed above and below the corresponding rollers;

[0011] The area above the roller is provided with a circulating air duct, and the circulating air duct has a turning section;

[0012] The fan is located in the turning section of the circulating air duct.

[0013] This technical solution involves setting up a circulating air duct above the rollers that transport the billet in the low-temperature heating zone of the electric heating roller kiln. This generates a circulating airflow in the area, enhancing the convective heat exchange between the airflow and the billet, improving the heating efficiency of the billet, and making the billet heat-dissipated more evenly, thereby improving product quality.

[0014] Furthermore, a fire-blocking component is provided at the connection between adjacent low-temperature heating sections;

[0015] The upper region of the roller is provided with a partition plate and a turning structure forming a turning segment;

[0016] The partition plate divides the area above the roller into upper and lower air ducts, and the two ends of the partition plate form a connecting channel between the upper and lower air ducts and the adjacent fire baffle components.

[0017] The upper and lower air ducts, connecting channels, and turning structures work together to form a circulating air duct.

[0018] Furthermore, the fire-blocking assembly includes a fire-blocking plate and a fire-blocking wall;

[0019] The fire baffle is located in the area above the roller;

[0020] The two ends of the partition plate form a connecting channel between the upper and lower air ducts and the adjacent fire baffle plate, respectively.

[0021] The fire barrier is located in the area below the roller.

[0022] Furthermore, the transition structure is an arched transition structure;

[0023] The fan is located in the turning section of the arched turning structure and blows air into the upper air duct.

[0024] Furthermore, the fan is a cross-flow fan, located at the turning point of the transition section, drawing air horizontally from within the transition section and blowing it vertically to the upper air duct.

[0025] Furthermore, the cross-flow fan is located at the turning point of the latter half of the turning section.

[0026] In this technical solution, the cross-flow fan draws air horizontally from the turning section and blows it vertically, directing the airflow to the upper air duct. This makes the airflow direction in the upper air duct the same as the forward direction of the billet, while the airflow direction in the lower air duct is opposite to the forward direction of the billet, thus enhancing the convective heat transfer between the airflow and the billet.

[0027] Furthermore, a support beam is also provided in the upper region of the roller;

[0028] The partition plate is fixed to the area above the roller by a support beam;

[0029] The heating rods located in the area above the rollers are placed below the partition plate and between the support beams.

[0030] Furthermore, the partition plate is a silicon carbide partition plate;

[0031] The support beam is a silicon carbide support beam.

[0032] In this technical solution, both the partition plate and the support beam are made of silicon carbide. Since silicon carbide has high thermal conductivity, it can quickly diffuse local heat outward, making the heating of the area above the roller more uniform.

[0033] Furthermore, each of the multiple low-temperature heating sections is surrounded by an insulation layer.

[0034] Compared with existing technologies, the principles and advantages of this technical solution are as follows:

[0035] 1. A circulating air duct is set up above the rollers that convey the billet in the low-temperature heating zone of the electric heating roller kiln. This generates a circulating airflow in the area, enhances the convective heat exchange between the airflow and the billet, improves the heating efficiency of the billet, and makes the billet heat more uniform, thereby improving product quality.

[0036] 2. The fan is a cross-flow fan, which is located at the turning point of the second half of the turning section. It draws air horizontally from the turning section and blows it vertically, so that the airflow direction of the upper air duct is the same as the forward direction of the billet, while the airflow direction of the lower air duct is opposite to the forward direction of the billet, thus enhancing the convective heat transfer effect between the airflow and the billet. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the services required in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the low-temperature heating zone structure of an electrically heated roller kiln according to an embodiment of the present invention (the arrow at point a points in the direction of the billet conveying).

[0039] Figure label:

[0040] 1-Low-temperature heating section; 2-Fan; 3-Heating rod; 4-Roller; 5-Partition plate; 6-Upper air duct; 7-Lower air duct; 8-Connecting channel; 9-Turn structure; 10-Support beam; 11-Insulation layer; 12-Fireproof plate; 13-Firewall. Detailed Implementation

[0041] The present invention will be further described below with reference to specific embodiments:

[0042] like Figure 1 As shown in the figure, the low-temperature heating zone structure of an electric heating roller kiln described in this embodiment includes multiple low-temperature heating sections 1, a fan 2, an electric heating rod 3 for heating the billet A, and a roller 4 for conveying the billet A.

[0043] The heating rods 3 and rollers 4 are both placed in the corresponding low-temperature heating section 1 and are arranged along the conveying direction of the billet A. The heating rods 3 are respectively placed above and below the corresponding rollers 4. A circulating air duct is provided in the area above the rollers 4, and the circulating air duct has a turning section. The fan 2 is set in the turning section of the circulating air duct.

[0044] Specifically, in this embodiment, a fire baffle assembly is provided at the connection of adjacent low-temperature heating sections 1; a partition plate 5 and a turning structure 9 forming a turning section are provided in the upper area of ​​the roller 4; the partition plate 5 divides the upper area of ​​the roller 4 into upper and lower air ducts, and the two ends of the partition plate 5 form a connecting channel 8 between the adjacent fire baffle assembly and the upper and lower air ducts; the upper and lower air ducts, the connecting channel 8 and the turning structure 9 cooperate to form a circulating air duct.

[0045] Specifically, in this embodiment, the fire baffle assembly includes a fire baffle plate 12 and a fire baffle wall 13; the fire baffle plate 12 is located in the upper region of the roller 4; the two ends of the partition plate 5 form a connecting channel 8 between the adjacent fire baffle plate 12 and the upper and lower air ducts; the fire baffle wall 13 is located in the lower region of the roller 4.

[0046] Specifically, in this embodiment, the turning structure 9 is an arched turning structure 9; the fan 2 is a cross-flow fan, which is set at the turning point of the second half of the turning section of the arched turning structure 9 (the air inlet section of the turning section is the first half, and the air outlet section of the turning section is the second half), draws air horizontally from the turning section and blows it vertically, blowing the air to the upper air duct 6.

[0047] Specifically, in this embodiment, a support beam 10 is also provided in the upper region of the roller 4; the partition plate 5 is fixed to the upper region of the roller 4 by the support beam 10; the electric heating rod 3 located in the upper region of the roller 4 is placed below the partition plate 5 and between the support beams 10.

[0048] Specifically, in this embodiment, the partition plate 5 is a silicon carbide partition plate 5; the support beam 10 is a silicon carbide support beam 10. A heat insulation layer 11 is provided around each of the multiple low-temperature heating sections 1 to improve the heat insulation performance of the low-temperature heating section 1.

[0049] The working principle of this embodiment is as follows:

[0050] A circulating air duct is set above the roller 4 that conveys billet A in the low-temperature heating zone of the electric heating roller kiln, so that circulating airflow is generated in this area, which enhances the convective heat exchange between the airflow and billet A, improves the heating efficiency of billet A, and makes the billet A more uniformly heated, thus improving product quality.

[0051] Furthermore, the fan 2 is a cross-flow fan, which is located at the turning point of the latter half of the turning section. It draws air horizontally from the turning section and blows it vertically, directing the air to the upper air duct 6. This makes the airflow direction of the upper air duct 6 the same as the forward direction of the billet A, while the airflow direction of the lower air duct 7 is opposite to the forward direction of the billet A, thus enhancing the convective heat transfer effect between the airflow and the billet A.

[0052] Both the partition plate 5 and the support beam 10 are made of silicon carbide. Silicon carbide has high thermal conductivity, which can quickly diffuse local heat outward, making the heating of the area above the roller 4 more uniform.

[0053] The above-described embodiments are merely preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all changes made in accordance with the shape and principle of this utility model should be covered within the protection scope of this utility model.

Claims

1. A low-temperature heating zone structure for an electrically heated roller kiln, characterized in that, It includes multiple low-temperature heating sections, a fan, heating rods for heating the billet, and rollers for conveying the billet; The heating rods and rollers are both placed in the corresponding low-temperature heating sections and are arranged along the conveying direction of the billet. The heating rods are respectively placed above and below the corresponding rollers; The area above the roller is provided with a circulating air duct, and the circulating air duct has a turning section; The fan is located in the turning section of the circulating air duct.

2. The low-temperature heating zone structure of an electrically heated roller kiln according to claim 1, characterized in that, Fire baffles are installed at the connection between adjacent low-temperature heating sections; The upper region of the roller is provided with a partition plate and a turning structure forming a turning segment; The partition plate divides the area above the roller into upper and lower air ducts, and the two ends of the partition plate form a connecting channel between the upper and lower air ducts and the adjacent fire baffle components. The upper and lower air ducts, connecting channels, and turning structures work together to form a circulating air duct.

3. The low-temperature heating zone structure of an electrically heated roller kiln according to claim 2, characterized in that, The fire-blocking assembly includes a fire-blocking plate and a fire-blocking wall; The fire baffle is located in the area above the roller; The two ends of the partition plate form a connecting channel between the upper and lower air ducts and the adjacent fire baffle plate, respectively. The fire barrier is located in the area below the roller.

4. The low-temperature heating zone structure of an electrically heated roller kiln according to claim 2, characterized in that, The transition structure is an arched transition structure; The fan is located in the turning section of the arched turning structure and blows air into the upper air duct.

5. The low-temperature heating zone structure of an electrically heated roller kiln according to claim 4, characterized in that, The fan is a cross-flow fan, located at the turning point of the transition section. It draws air horizontally from within the transition section and blows it vertically to the upper air duct.

6. The low-temperature heating zone structure of an electrically heated roller kiln according to claim 5, characterized in that, The cross-flow fan is located at the turning point of the latter half of the turning section.

7. The low-temperature heating zone structure of an electrically heated roller kiln according to claim 2, characterized in that, The area above the roller is also provided with a support beam; The partition plate is fixed to the area above the roller by a support beam; The heating rods located in the area above the rollers are placed below the partition plate and between the support beams.

8. The low-temperature heating zone structure of an electrically heated roller kiln according to claim 7, characterized in that, The partition plate is a silicon carbide partition plate; The support beam is a silicon carbide support beam.

9. The low-temperature heating zone structure of an electrically heated roller kiln according to claim 1, characterized in that, Each of the multiple low-temperature heating sections is surrounded by an insulation layer.

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