Roller kiln heat preservation structure

Abstract

The utility model belongs to the technical field of glass manufacturing and forming in chemistry and metallurgy, and particularly relates to a roller kiln heat preservation structure which comprises a kiln body defined by a kiln top cover, a kiln bottom plate and two kiln side walls, and a material heating space used for heat treatment of workpieces is arranged in the kiln body. The two sides of the material heating space are each provided with an active heat preservation layer with a heating device. A feeding unit extending in the longitudinal direction of the kiln body is arranged in the material heating space, heating units are arranged between the feeding unit and the kiln top cover and between the feeding unit and the kiln bottom plate respectively, and the feeding unit and the heating units are located between the two active heat preservation layers. According to the structure, the temperature of the active heat preservation layers on the two sides can be increased through the heating device, the temperature gradient from the material heating space to the external environment space is slowed down, and therefore the speed that heat on the two sides in the hearth is conducted outwards to be lost along the kiln side wall can be reduced, and the temperature difference between the heat and the middle is reduced; and the effects of improving the temperature consistency in the hearth and enabling the glass quality to be more stable are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of glass manufacturing and forming in chemistry and metallurgy, and specifically relates to a roller kiln insulation structure. Background Art

[0002] Glass-ceramics is a kind of dense microcrystalline phase and glass phase multiphase complex formed by crystallization heat treatment of basic glass with specific components under a certain temperature system, so that a large number of tiny crystals are uniformly precipitated in the glass. The treatment process will release a lot of heat, which is called crystallization exotherm. By controlling the type, quantity and size of microcrystals, transparent glass-ceramics, low expansion coefficient glass-ceramics, high strength and high hardness glass-ceramics, etc. can be obtained. They are widely used in aerospace, electronic equipment, architectural decoration and other industries.

[0003] In the production process of microcrystalline glass, kiln heating equipment is required, and roller kiln is one of the common heat treatment equipment. The traditional roller kiln includes a furnace formed by the wall of the kiln, with material inlet and outlet ends at both ends of the furnace in the longitudinal direction, and a number of rollers are arranged in the furnace along the longitudinal interval. The rollers are arranged horizontally and the ends can rotate to pass through the side wall of the kiln, and are connected to the sprocket or pulley outside the side wall of the kiln. The motor outside the furnace drives all rollers to rotate synchronously through the chain or belt, so that all rollers form a roller that can transport materials in the longitudinal direction; in the furnace, heating mechanisms are respectively arranged above and below the rollers, some of which adopt combustion heating, such as the roller kiln disclosed in Chinese Patent 95224123.4, and some adopt electric heating wires, such as the roller kilns disclosed in CN215162140U and CN208327806U.

[0004] The basic glass crystallizes to form crystals at a certain crystallization temperature. The type, quantity, and crystallization speed of the glass crystals will vary with the temperature. Due to the distribution characteristics of the heating mechanism and the structure of the kiln, the existing roller kiln has a temperature difference in the horizontal direction of the roller inside the furnace. This is mainly because the two sides of the furnace are close to the side walls of the kiln. The temperature difference between the inside and outside of the side walls of the kiln is large, and it is easy to dissipate heat to the outside space, resulting in lower temperatures on both sides of the furnace. The microcrystalline glass passing through the roller kiln has different crystallization processes due to the temperature difference, which will affect the product quality.

[0005] The roller kiln disclosed in CN208327806U uses temperature sensors and controllers to accurately control the temperature at different positions in the heating chamber, and uses two sets of conveying rollers to balance the heating temperature; the roller kiln disclosed in CN211147286U adds an infrared reflective coating layer on the inner wall to improve the heat utilization rate. However, the problem of heat dissipation along the side walls of the kiln on both sides has not been improved, and the temperature difference in the lateral direction of the roller still exists. Summary of the invention

[0006] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the utility model is to provide a roller kiln insulation structure to avoid the problem that heat on both sides of the furnace is easily conducted outward along the side walls of the kiln and lost, thereby achieving the effect of reducing heat loss on both sides and reducing the temperature difference with the middle.

[0007] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0008] The roller kiln insulation structure includes a kiln body formed by a kiln top cover, a kiln bottom plate and two kiln side walls. A material heating space for heat treating workpieces is provided in the kiln body, and active insulation layers with heating devices are provided on both sides of the material heating space.

[0009] To further improve the above technical solution, the active insulation layer includes an insulation wall opposite to the side wall of the kiln, an active insulation space is formed between the side wall of the kiln and the insulation wall, and the heating device is arranged in the active insulation space.

[0010] Furthermore, it also includes a thermal control device, which includes a thermocouple, and the thermocouple signal is connected to a temperature controller, and the temperature controller controls the connection to the heating device.

[0011] Furthermore, the heating device comprises a heating element, the number of the heating elements is plural and the heating elements are arranged at intervals along the longitudinal direction of the kiln body, and the thermocouples and the heating elements are arranged one to one.

[0012] Furthermore, the heating element adopts a heating silicon carbon rod, and the heating silicon carbon rod is U-shaped.

[0013] Furthermore, the heating silicon carbon rod and the thermocouple are both connected to the kiln top cover, the two free ends of the heating silicon carbon rod extend upward out of the kiln top cover, the upper end of the thermocouple extends upward out of the kiln top cover, and the lower ends of the heating silicon carbon rod and the thermocouple extend downward into the active insulation space; the temperature controller is located outside the kiln body and is connected to the two free ends of the heating silicon carbon rod and the upper end of the thermocouple.

[0014] Furthermore, the insulation wall is built with lightweight mullite insulation bricks.

[0015] Furthermore, a feeding unit extending longitudinally along the kiln body is provided in the material heating space, and heating units are respectively provided between the feeding unit and the kiln top cover and the kiln bottom plate, and the feeding unit and the heating unit are located between two active insulation layers.

[0016] Optionally, the feeding unit is a roller conveyor composed of a plurality of rollers arranged at intervals; the ends of the rollers rotate through the active insulation layer at the corresponding ends and the side wall of the kiln, and are externally connected to a rotation drive source.

[0017] Optionally, the feeding unit is a roller conveyor composed of a plurality of rollers arranged at intervals; an inlet and an outlet are respectively provided at the longitudinal ends of the kiln body, a roller conveyor bracket extending along the longitudinal direction of the kiln body is provided in the kiln body, the inlet and the outlet are respectively extended at the two ends of the roller conveyor bracket, the two ends of the roller are rotatably connected to the roller conveyor bracket, a rotation driving source is provided on the end of the roller conveyor bracket located outside the inlet or outlet, and the rotation driving source drives and connects the rollers through a transmission mechanism.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] 1. The roller kiln insulation structure of the utility model is provided with active insulation layers with heating devices on both sides of the material heating space; according to Fourier's law, the speed of heat conduction from the hot space to the external environment space is proportional to the temperature gradient in the conduction direction. After the active insulation layer with the heating device is provided, the temperature of the active insulation layer can be increased by the heating device to slow down the temperature gradient from the material heating space to the external environment space, thereby reducing the speed of heat conduction and loss from both sides of the furnace along the side walls of the kiln to the outside, and reducing the temperature difference with the middle; so as to achieve the effect of improving the temperature consistency in the furnace and making the glass quality more stable.

[0020] 2. The roller kiln insulation structure of the utility model does not change the overall area of ​​the original kiln much, is easy to build, and can be modified on existing equipment; it is automatically controlled by a thermal control device and is convenient and reliable to use; through the insulation wall, heating device, active insulation space, and kiln side wall, a more stable temperature change gradient structure is formed to further improve the insulation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a roller kiln insulation structure of a specific embodiment;

[0022] Figure 2 for Figure 1 A top view of

[0023] Among them, there are a kiln main body 1, a kiln bottom plate 11, a kiln side wall 12, a kiln top cover 13, a material heating space 2, an active insulation layer 3, an insulation wall 31, a heating device 32, an active insulation space 33, a heating silicon carbon rod 34, a thermocouple 4, and a temperature controller 5. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiments of the present utility model clearer, the technical solution in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model.

[0025] See also Figure 1 , Figure 2The roller kiln insulation structure of the embodiment of the utility model includes a kiln body 1 surrounded by a kiln top cover 13, a kiln bottom plate 11 and two kiln side walls 12. A material heating space 2 for heat treating workpieces is provided in the kiln body 1, and active insulation layers 3 with heating devices 32 are respectively provided on both sides of the material heating space 2.

[0026] According to Fourier's law, the speed of heat conduction from the hot space to the external environment space is proportional to the temperature gradient in the conduction direction. Different from the traditional scheme of laying heat-insulating refractory materials on the inner wall of the kiln for passive heat insulation, the structure of this invention can actively increase the temperature of the active heat-insulating layer 3 with heating devices 32 on both sides of the material heating space 2 through the heating device 32, so as to slow down the temperature gradient from the material heating space 2 to the external environment space, thereby reducing the speed of heat conduction and loss from both sides of the furnace along the side wall 12 of the kiln, reducing the temperature difference with the middle part, and ensuring the uniformity and stability of the temperature of the material heating space 2. In addition, it is ensured that the microcrystalline glass processed by the material heating space 2 forms crystals with uniform types, quantities and sizes, and ensures the stability and yield of the product.

[0027] During implementation, the active insulation layer 3 can be the kiln side wall 12 itself, and a heating device 32 for heating the kiln side wall 12 is installed inside it; the active insulation layer 3 can also be an independently added insulation part, located on the inner side or outer side of the kiln side wall 12, both of which can play the role of slowing down the temperature gradient from the material heating space 2 to the external space, thereby reducing the speed of heat conduction and loss to the outside on both sides.

[0028] Please continue to see Figure 1 In this embodiment, the active thermal insulation layer 3 includes a thermal insulation wall 31 opposite to the kiln side wall 12, an active thermal insulation space 33 is formed between the kiln side wall 12 and the thermal insulation wall 31, and the heating device 32 is arranged in the active thermal insulation space 33. In one embodiment, the thermal insulation wall 31 can be specifically built with lightweight mullite thermal insulation bricks.

[0029] In this way, the original kiln has little change in overall area, is easy to build, can be modified on existing equipment, and the kiln side wall 12 can still ensure the lateral stability of the kiln body 1. The heat insulation wall 31, the heating device 32, the active heat insulation space 33, and the kiln side wall 12 work together to reduce the loss rate of heat conduction from both sides of the kiln to the outside, forming a more stable temperature change gradient structure, and further improving the heat preservation effect.

[0030] For the heating and temperature maintenance control of the heating device 32, manual temperature measurement and real-time adjustment can be performed. In order to reduce manpower consumption and reduce management and control costs, the present structure also includes a thermal control device, which includes a thermocouple 4, and the signal of the thermocouple 4 is connected to the temperature controller 5, and the temperature controller 5 controls the connection of the heating device 32. The heating device 32 includes a heating element, and the number of the heating elements is multiple and is arranged at intervals along the longitudinal direction of the kiln body 1. The thermocouple 4 is arranged one-to-one with the heating element. According to the preset temperature threshold, the thermocouple 4 detects the temperature and transmits the signal to the temperature controller 5, and the temperature controller 5 automatically controls the heating of the heating device 32 and the temperature maintenance in the active insulation space 33.

[0031] Please continue to see Figure 1 , Figure 2 , the heating element specifically adopts a heating silicon carbon rod 34, and the heating silicon carbon rod 34 is U-shaped. The heating silicon carbon rod 34 and the thermocouple 4 are both connected to the kiln top cover 13, the two free ends of the heating silicon carbon rod 34 extend upward out of the kiln top cover 13, the upper end of the thermocouple 4 extends upward out of the kiln top cover 13, and the lower ends of the heating silicon carbon rod 34 and the thermocouple 4 extend downward into the active insulation space 33; the temperature controller 5 is located outside the kiln body 1 and is connected to the two free ends of the heating silicon carbon rod 34 and the upper end of the thermocouple 4. During implementation, the heating silicon carbon rod 34 and the thermocouple 4 can be installed by drilling holes on the kiln top cover 13; or a reserved installation port can be used, and the heating silicon carbon rod 34 and the thermocouple 4 are connected to the structural cover body adapted to the installation port, and then the cover is buckled and connected to the kiln top cover 13; the temperature controller 5 can be set one-to-one with the thermocouple 4 and the heating element, or one temperature controller 5 can be connected to multiple groups of thermocouples 4 and heating elements, and there is no specific limitation.

[0032] It can be understood that, for conventional use, the two ends of the kiln body 1 in the longitudinal direction respectively have an inlet and an outlet, a feeding unit extending along the longitudinal direction of the kiln body 1 will be provided in the material heating space 2, and heating units are respectively provided between the feeding unit and the kiln top cover 13 and the kiln bottom plate 11. In the case of this structure, the feeding unit and the heating unit (not shown in the figure) are located between the two active insulation layers 3.

[0033] The feeding unit is a roller table composed of a number of rollers arranged at intervals, and the heating unit is a number of heating wires arranged at intervals; the ends of the rollers can be rotated through the active insulation layer 3 (avoiding the heating silicon carbon rod 34 and the thermocouple 4) at the corresponding ends and the kiln side wall 12, and an external rotation drive source is connected; or a roller table bracket extending longitudinally along the kiln body 1 is provided in the kiln body 1, and the two ends of the roller table bracket extend out of the inlet and the outlet respectively, and the two ends of the roller are rotatably connected to the roller table bracket, and a rotation drive source is provided on the end of the roller table bracket outside the inlet or outlet, and the rotation drive source is driven to connect each roller through a transmission mechanism, which is a common way to drive the roller, and the details are not repeated here.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. Roller kiln insulation structure, characterized by: The invention comprises a kiln main body formed by a kiln top cover, a kiln bottom plate and two kiln side walls, wherein a material heating space for heat treating workpieces is arranged in the kiln main body, and active thermal insulation layers with heating devices are arranged on both sides of the material heating space; the active thermal insulation layer comprises an insulation wall body opposite to the kiln side wall, an active thermal insulation space is formed between the kiln side wall and the insulation wall, and the heating device is arranged in the active thermal insulation space; It also includes a thermal control device, which includes a thermocouple, and the thermocouple signal is connected to a temperature controller, and the temperature controller controls the connection to the heating device; the heating device includes a heating element, and the number of the heating elements is multiple and arranged at intervals along the longitudinal direction of the kiln body, and the thermocouples and the heating elements are arranged one to one.

2. The roller kiln insulation structure according to claim 1, characterized in that: The heating element adopts a heating silicon carbon rod, and the heating silicon carbon rod is U-shaped.

3. The roller kiln insulation structure according to claim 2 is characterized in that: The heating silicon carbon rod and the thermocouple are both connected to the kiln top cover, the two free ends of the heating silicon carbon rod extend upward out of the kiln top cover, the upper end of the thermocouple extends upward out of the kiln top cover, and the lower ends of the heating silicon carbon rod and the thermocouple extend downward into the active insulation space; the temperature controller is located outside the kiln body and is connected to the two free ends of the heating silicon carbon rod and the upper end of the thermocouple.

4. The roller kiln insulation structure according to any one of claims 1 to 3, characterized in that: The insulation wall is built with lightweight mullite insulation bricks.

5. The roller kiln insulation structure according to claim 1 is characterized in that: A feeding unit extending longitudinally along the kiln body is arranged in the material heating space, and heating units are respectively arranged between the feeding unit and the kiln top cover and the kiln bottom plate. The feeding unit and the heating unit are located between two active insulation layers.

6. The roller kiln insulation structure according to claim 5, characterized in that: The feeding unit is a roller conveyor composed of a plurality of rollers arranged at intervals; the ends of the rollers rotate through the active insulation layer at the corresponding ends and the side wall of the kiln, and are externally connected to a rotation driving source.

7. The roller kiln insulation structure according to claim 5, characterized in that: The feeding unit is a roller conveyor composed of a number of rollers arranged at intervals; an inlet and an outlet are respectively provided at the two longitudinal ends of the kiln body, a roller conveyor bracket extending along the longitudinal direction of the kiln body is provided in the kiln body, and the inlet and the outlet are respectively extended at the two ends of the roller conveyor bracket, and the two ends of the roller are rotatably connected to the roller conveyor bracket, and a rotation driving source is provided on the end of the roller conveyor bracket located outside the inlet or outlet, and the rotation driving source drives and connects each roller through a transmission mechanism.

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