A cooling device applied to a roller kiln

Abstract

This utility model discloses a cooling device for a roller kiln, including a bearing housing, an outer bearing component, and an inner bearing component. The bearing housing has a fixed cavity formed for the end of a pre-set kiln roller shaft to pass through, and the fixed cavity is coaxially divided into a first receiving cavity, a hollow cavity, and a second receiving cavity. The outer bearing component is sleeved on the end of the kiln roller shaft and fixedly placed in the first receiving cavity. The inner bearing component is sleeved on the end of the kiln roller shaft and fixedly placed in the second receiving cavity. The hollow cavity and the outer circumferential surface of the kiln roller shaft end form a cooling cavity that unidirectionally communicates with the inner bearing component. An air guide channel is provided inside the bearing housing, with one end extending into the hollow cavity and the other end extending through to the outside of the bearing housing, allowing pre-set cooling air to sequentially enter the cooling cavity through the air guide channel and then blow towards the inner bearing component. This utility model achieves cooling of the inner bearing component by guiding the cooling air to the high-temperature side, thus extending its service life.

Description

Technical Field

[0001] This utility model relates to the technical field of kiln roller fixing structure, and in particular to a cooling device applied to roller kilns. Background Technology

[0002] Currently, most heat treatment kilns are fully automated sintering roller kilns, heating raw materials continuously 24 hours a day. The sintering temperature inside these kilns commonly reaches as high as 950℃, and the conveyor shafts for transporting the sintering materials are typically made of ceramic rollers. To maintain the temperature of the heating environment inside the roller kiln, high-temperature resistant insulation materials are required. However, the ceramic rollers, acting as conveyor shafts, need to traverse the kiln to transmit power. Some of the heat inside the kiln is transferred to the external deep groove ball bearings (internal bearing components) via the ceramic rollers. These transmission bearings in the high-temperature zone need to withstand temperatures up to 250℃. High temperatures directly affect the materials and lubricants inside the deep groove ball bearings, necessitating the development of high-temperature bearing materials and manufacturing processes. Domestic demand for high-temperature bearings is relatively low, and there are few bearing manufacturers that can meet the material and temperature resistance requirements of heat treatment roller kilns, and their operating costs are very high. Therefore, developing a device for cooling the bearings is crucial.

[0003] Therefore, based on the aforementioned technical problems, this application proposes a cooling device for roller kilns. When the roller kiln is in normal high-temperature heat treatment production, simply blowing room-temperature gas or a protective gas capable of cooling into the air guide channel of the bearing housing can cool the deep groove ball bearing (inner bearing component) inside the bearing housing, thereby ensuring that the inner bearing component can be at its normal operating temperature, reducing operating costs, and extending service life. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a cooling device for roller kilns that reduces usage costs and extends service life.

[0005] To achieve the above objectives, this utility model provides a cooling device for a roller kiln, comprising a bearing housing, an outer bearing component, and an inner bearing component. The bearing housing has a fixed cavity formed therethrough for the shaft end of a pre-set kiln roller to pass through. The fixed cavity is coaxially divided into a first accommodating cavity, a hollow cavity, and a second accommodating cavity from the outside to the inside. The outer bearing component is sleeved on the shaft end of the kiln roller and fixedly placed in the first accommodating cavity. The inner bearing component is sleeved on the shaft end of the kiln roller and fixedly placed in the second accommodating cavity. The hollow cavity and the outer circumferential surface of the shaft end of the kiln roller form a cooling cavity that unidirectionally communicates with the inner bearing component. An air guide channel is provided inside the bearing housing. One end of the air guide channel extends into the hollow cavity and the other end extends through to the outside of the bearing housing, allowing pre-set cooling air to enter the cooling cavity through the air guide channel and then blow towards the inner bearing component.

[0006] Furthermore, the inner diameter of both the first and second accommodating cavities is larger than the inner diameter of the hollow cavity.

[0007] Furthermore, the air guide channel is composed of an air inlet and an air guide hole, wherein one end of the air guide hole extends to the top surface of the bearing housing and the other end extends through the hollow cavity, and one end of the air inlet extends to the outer end surface of the bearing housing and the other end extends through the air guide hole.

[0008] Furthermore, a bushing is fitted on the outer circumferential surface of the shaft end of the kiln roller, wherein the two ends of the bushing abut against the end face of the inner bearing component and the end face of the outer bearing component, respectively; an oil seal is also fitted on the outer circumferential surface of the bushing, wherein the oil seal is fixedly placed at the junction of the first accommodating cavity and the hollow cavity, and the oil seal is used to cooperate with the bushing to block the cooling airflow in the hollow cavity from flowing to the first accommodating cavity.

[0009] Furthermore, the first accommodating cavity is provided with an annular primary sealing groove, which is used to cooperate with a pre-set sealing ring to prevent cooling airflow from flowing to the gap between the inner surface of the first accommodating cavity and the outer ring of the outer bearing component. The second accommodating cavity is provided with an annular secondary sealing groove, which is used to cooperate with a pre-set sealing ring to prevent cooling airflow from flowing to the gap between the inner surface of the second accommodating cavity and the outer ring of the inner bearing component.

[0010] Furthermore, a primary temperature sensor is provided on the first accommodating cavity to detect the temperature of the outer bearing component, and a secondary temperature sensor is provided on the second accommodating cavity to detect the temperature of the inner bearing component.

[0011] Furthermore, the air guide hole can be positioned at an angle.

[0012] Furthermore, one end of the air inlet extends to the outer end face of the bearing housing and is connected to a pre-set gas input device, which is used to produce or transport cooling air.

[0013] Furthermore, the cooling device also includes a fixing component and a positioning component. The fixing component is used to position and fix the outer bearing component, and the positioning component is used to position and fix the inner bearing component. Preferably, both the fixing component and the positioning component are made of heat-resistant material.

[0014] Furthermore, the outer bearing component and the inner bearing component are preferably deep groove ball bearing components without a sealing structure.

[0015] The present invention adopts the above-described solution, and its beneficial effects are as follows: As a conveyor shaft, the kiln roller needs to traverse the kiln to transmit power as required by production. Some of the heat inside the kiln is transferred through the kiln roller to the bearings in contact with it, placing the bearings in a high-temperature environment during operation and potentially reducing their lifespan. The traditional solution is to use high-temperature resistant bearings to ensure stable operation of the kiln roller in high-temperature conditions. However, the current manufacturing process for high-temperature resistant bearings is demanding, resulting in high procurement costs. Therefore, unlike traditional solutions, this embodiment optimizes the bearing housing design by implementing a coaxial arrangement. The first accommodating cavity, the hollow cavity, and the second accommodating cavity, along with an air guide channel connecting the outside of the bearing housing to the hollow cavity, allow the air guide channel to deliver cooling air to the second accommodating cavity and direct the cooling air to the inner bearing component under normal operating conditions. This cools the inner bearing component, enabling it to operate in high-temperature environments and extending its service life. Furthermore, compared to purchasing high-temperature resistant bearings, the inner bearing component used in this embodiment has a relatively simple manufacturing process and lower procurement costs, making it easier for large-scale applications and thus reducing both initial investment and subsequent operating costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the cooling device in this embodiment.

[0017] Figure 2 This is a bottom view schematic diagram of the cooling device applied to the kiln rollers in this embodiment.

[0018] Figure 3 for Figure 2 A schematic diagram of the cross-section at point AA.

[0019] Figure 4 for Figure 3 Enlarged diagram of part B in the diagram Figure 5 for Figure 4 A schematic diagram of a separate cross-section of the bearing housing.

[0020] Figure 6 for Figure 2 A cross-sectional view at point CC.

[0021] Among them, 1-bearing housing, 11-first accommodating cavity, 111-first-level sealing groove, 12-hollow cavity, 13-second accommodating cavity, 131-second-level sealing groove, 132-positioning groove, 14-air guide channel, 141-air inlet, 142-air guide hole, 15-cooling cavity, 2-outer bearing component, 3-inner bearing component, 4-shaft sleeve, 5-oil seal component, 6-kiln roller, 7-shaft body, 8-positioning component. Detailed Implementation

[0022] To facilitate understanding of this utility model, a more complete description of it is provided below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of the utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0023] See appendix Figure 1 , 2 As shown in Figure 5, in this embodiment, a cooling device applied to a roller kiln includes a bearing seat 1, an outer bearing component 2, and an inner bearing component 3. The bearing seat 1 has a fixed cavity formed on it for the end of a shaft 7 pre-installed with a kiln roller 6 to pass through. The fixed cavity is coaxially divided into a first accommodating cavity 11, a hollow cavity 12, and a second accommodating cavity 13 from the outside in. The inner diameter of both the first accommodating cavity 11 and the second accommodating cavity 13 is larger than the inner diameter of the hollow cavity 12. This dimensional setting of the first accommodating cavity 11, the hollow cavity 12, and the second accommodating cavity 13 facilitates the subsequent positioning and installation of the oil seal component 5 and the inner bearing component 3 (i.e., the oil seal component 5 and the inner bearing component 3 can be directly placed on both sides of the hollow cavity 12, see Appendix). Figure 4As shown in the figure), the outer bearing component 2 is sleeved on the end of the shaft 7 of the kiln roller 6 and fixedly placed in the first accommodating cavity 11, and the inner bearing component 3 is sleeved on the end of the shaft 7 of the kiln roller 6 and fixedly placed in the second accommodating cavity 13. The cooling device also includes a fixing component and a positioning component 8, which are preferably made of heat-resistant material. When the outer bearing component 2 is placed in the first accommodating cavity 11, the fixing component is installed in the first accommodating cavity 11 (not shown in the figure) to position and fix the outer bearing component 2, so as to avoid the outer bearing component 2 from shifting due to vibration or heat during overall assembly or subsequent use. Similarly, the second accommodating cavity 13 is also provided with a positioning component 8 for fixing the inner bearing component 3. Correspondingly, the second accommodating cavity 13 is formed with a positioning groove 132 for the positioning component 8 to be installed. When the inner bearing component 3 is placed in the second accommodating cavity... After step 13, by installing the positioning component 8 in the second accommodating cavity 13 to position and fix the inner bearing component 3, it is possible to avoid the inner bearing component 3 shifting due to vibration or heat during overall assembly or subsequent use. Based on the positioning and fixing of the outer bearing component 2 by the fixing component and the positioning and fixing of the inner bearing component 3 by the positioning component 8, the outer bearing component 2 can operate stably in a relatively fixed position (first accommodating cavity 11), and the inner bearing component 3 can operate stably in a relatively fixed position (second accommodating cavity 13), ensuring the normal operation of the kiln roller 6 and improving the overall stability. Furthermore, by setting two bearings, the outer bearing component 2 and the inner bearing component 3, this embodiment can avoid the disadvantage of using a single bearing when the kiln roller 6 is too heavy, which would cause a large bearing load, resulting in a relatively reduced service life and increased replacement costs.

[0024] In this embodiment, the hollow cavity 12 and the outer peripheral surface of the shaft 7 of the kiln roller 6 form a cooling cavity 15 that flows unidirectionally toward the inner bearing component 3. An air guide channel 14 is provided inside the bearing seat 1. One end of the air guide channel 14 extends into the hollow cavity 12, and the other end extends through to the outside of the bearing seat 1, allowing pre-set cooling air to sequentially enter the cooling cavity 15 through the air guide channel 14 and then blow towards the inner bearing component 3. Specifically, as cooling air continuously enters the cooling cavity 15 from the air guide channel 14, the pressure inside the cooling cavity 15 gradually increases. The cooling air flows from the high-pressure area to the low-pressure area. Based on the cooperation of the bushing 4 and the oil seal 5, a sealed state is formed at the junction of the first accommodating cavity 11 and the hollow cavity 12, allowing the cooling air to flow unidirectionally only toward the inner bearing component 3 (inner direction). (For the specific flow direction of the cooling air, refer to...) Figure 4 (As shown by the solid arrow), the inner bearing component 3 is cooled down, allowing it to operate in a normal temperature environment, which relatively extends the service life of the inner bearing component 3 and reduces the cost of use.

[0025] Secondly, see appendix Figure 1As shown, in this embodiment, the outer bearing component 2 is located on the outside of the bearing housing 1, making it easier for the operator to directly contact the outer bearing component 2. Other types of cooling equipment can be arranged to directly cool the outer bearing component 2. Furthermore, when the cooling air directly cools the inner bearing component 3, it will also relatively reduce the temperature of the shaft body 7, thereby allowing the outer bearing component 2 to operate in a more normal temperature environment, thus ensuring the normal use of the outer bearing component 2 and relatively extending its service life.

[0026] In addition, the inner bearing component 3 and the outer bearing component 2 used in this embodiment are preferably deep groove ball bearings without a sealing structure. Common deep groove ball bearings generally consist of an outer ring, an inner ring, a cage and several balls disposed between the outer ring and the inner ring (some bearings are also equipped with a sealing ring, but the bearings used in this embodiment are preferably not equipped with a sealing ring). There is bearing clearance between the balls and the outer ring (by adjusting the bearing clearance, the normal use of the deep groove ball bearing is ensured). Therefore, the cooling air can come into contact with the internal structure of the inner bearing component 3 through the bearing clearance, thereby achieving the cooling function of the inner bearing component 3 and relatively extending the service life of the inner bearing component 3.

[0027] See appendix Figure 4 As shown, furthermore, a bushing 4 is fitted on the outer circumferential surface of the shaft body 7 of the kiln roller 6, wherein the two ends of the bushing 4 abut against the end face of the inner bearing component 3 and the end face of the outer bearing component 2, respectively; an oil seal 5 is also fitted on the outer circumferential surface of the bushing 4, wherein the oil seal 5 is fixedly placed at the junction of the first accommodating cavity 11 and the hollow cavity 12, and the oil seal 5 is used to cooperate with the bushing 4 to block the cooling airflow in the hollow cavity 12 from flowing to the first accommodating cavity 11. Specifically, to ensure that the cooling air, after entering the cooling cavity 15, only flows towards the inner bearing component 3. For unidirectional flow, the junction of the first accommodating cavity 11 and the hollow cavity 12 needs to be sealed. This is achieved by using an oil seal 5, whose outer circumferential surface is tightly fitted to the inner wall of the first accommodating cavity 11. However, considering that the end of the shaft 7 of the kiln roller 6 passes through the first accommodating cavity 11 and the hollow cavity 12 and is in a rotating state, the oil seal 5 is fitted onto the outer circumferential surface of the bushing 4. This avoids direct contact between the kiln roller 6 and the oil seal 5, thereby achieving the purpose of sealing the junction of the first accommodating cavity 11 and the hollow cavity 12.

[0028] See appendix Figure 4 , 5As shown, the air guide channel 14 is further composed of an air inlet 141 and an air guide 142. One end of the air guide 142 extends to the top surface of the bearing housing 1 and the other end extends through the hollow cavity 12. One end of the air inlet 141 extends to the outer end surface of the bearing housing 1 and the other end extends through the air guide 142. The operator can connect the air inlet 141 to a pre-set gas input device (the gas input device is used to produce or transport cooling air), so that the gas input device inputs cooling air into the air inlet 141, thereby achieving the function of cooling the inner bearing component 3. The cooling air can be room temperature gas or a protective gas with cooling function. For the cooling method of the outer bearing component 2, the operator can directly spray cooling onto the outer bearing component 2 through other cooling equipment (such as a jet device). Secondly, refer to Figure 6 As shown, the air vent 142 can be positioned at an angle (for easier observation). Figure 4 (The air inlet 141 and the air outlet 142 are shown), thus avoiding some of the holes, see reference. Figure 1 As shown, by setting the air inlet 141 to connect the outer end face of the bearing housing 1 with the air guide hole 142, it is easier for the operator to input the preset cooling air from the outer end face of the bearing housing 1 to the inner bearing component 3 without affecting the normal operation of other working components (such as gears, transmission belts, protective housings, etc.), thus reducing the difficulty of conveying cooling air.

[0029] See appendix Figure 4 , 5 As shown, the first accommodating cavity 11 is further provided with an annular primary sealing groove 111. The primary sealing groove 111 is used to cooperate with the preset sealing ring to prevent the cooling air from flowing to the gap between the inner surface of the first accommodating cavity 11 and the outer ring of the outer bearing component 2. The second accommodating cavity 13 is provided with an annular secondary sealing groove 131, thereby ensuring that the cooling air (the cooling air input by the operator from the outside of the bearing housing using the jet device) only passes through the inside of the outer bearing component 2 (bearing clearance), so that the outer bearing component 2 can achieve the purpose of rapid cooling from the inside. The secondary sealing groove 131 is used to cooperate with the preset sealing ring to prevent the cooling air from flowing to the gap between the inner surface of the second accommodating cavity 13 and the outer ring of the inner bearing component 3, thereby ensuring that the cooling air only passes through the inside of the inner bearing component 3 (bearing clearance), so that the inner bearing component 3 can achieve the purpose of rapid cooling from the inside.

[0030] In this embodiment, a primary temperature sensor is also provided on the first accommodating cavity 11 to detect the temperature of the outer bearing component 2. A secondary temperature sensor (not shown in the figure) is provided on the second accommodating cavity 13 to detect the temperature of the inner bearing component 3 (not shown in the figure). By using the primary temperature sensor to detect the temperature of the outer bearing component 2 in the first accommodating cavity 11 and the inner bearing component 3 in the second accommodating cavity 13 in real time, the operator can promptly understand the temperature of the outer bearing component 2 and the inner bearing component 3. When the temperature of both is at a high level, the cooling air supply for rapid cooling can be adjusted in time (increasing the output air volume or reducing the temperature of the output cooling air) to ensure that the temperature of the outer bearing component 2 and the inner bearing component 3 drops back to the normal operating temperature range of the bearing components, thereby relatively extending the service life of the bearing components and reducing the cost of subsequent maintenance or replacement of the bearing components.

[0031] The embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the utility model in any way. Any modifications or alterations made by those skilled in the art to the technical solution of this utility model without departing from its scope are equivalent embodiments of this utility model. Therefore, all equivalent changes made based on the concept of this utility model without departing from its scope should be covered within the protection scope of this utility model.

Claims

1. Cooling device for application to a roller kiln, characterized in that: The assembly includes a bearing housing (1), an outer bearing component (2), and an inner bearing component (3). The bearing housing (1) has a fixed cavity formed on it for the end of the shaft (7) on which the kiln roller (6) is pre-set to pass. The fixed cavity is coaxially divided into a first accommodating cavity (11), a hollow cavity (12), and a second accommodating cavity (13) from the outside to the inside. The outer bearing component (2) is sleeved on the end of the shaft (7) of the kiln roller (6) and fixedly placed in the first accommodating cavity (11). The inner bearing component (3) is sleeved on the end of the shaft (7) of the kiln roller (6). The upper part is fixedly placed in the second accommodating cavity (13). The hollow cavity (12) and the outer peripheral surface of the shaft (7) end of the kiln roller (6) form a cooling cavity (15) that is unidirectionally connected to the inner bearing component (3). The bearing seat (1) is provided with an air guide channel (14). One end of the air guide channel (14) extends to the hollow cavity (12) and the other end extends through to the outside of the bearing seat (1), so that the preset cooling air can enter the cooling cavity (15) through the air guide channel (14) and blow towards the inner bearing component (3).

2. The cooling device for a roller kiln according to claim 1, characterized in that: The inner diameter of the first accommodating cavity (11) and the second accommodating cavity (13) is larger than the inner diameter of the hollow cavity (12).

3. Cooling device for a roller kiln according to claim 1, characterized in that: The air guide channel (14) is composed of an air inlet (141) and an air guide (142). One end of the air guide (142) extends to the top surface of the bearing seat (1) and the other end extends through to the hollow cavity (12). One end of the air inlet (141) extends to the outer end surface of the bearing seat (1) and the other end extends through to the air guide (142).

4. A cooling device for a roller kiln according to claim 1, characterized in that: A bushing (4) is also fitted on the outer circumferential surface of the shaft (7) of the kiln roller (6). The two ends of the bushing (4) abut against the end face of the inner bearing (3) and the end face of the outer bearing (2), respectively. An oil seal (5) is also fitted on the outer circumferential surface of the bushing (4). The oil seal (5) is fixedly placed at the junction of the first accommodating cavity (11) and the hollow cavity (12). The oil seal (5) is used to cooperate with the bushing (4) to block the cooling airflow in the hollow cavity (12) from flowing to the first accommodating cavity (11).

5. A cooling device for a roller kiln according to claim 1, characterized in that: The first accommodating cavity (11) is provided with an annular primary sealing groove (111), which is used to cooperate with a pre-set sealing ring to prevent cooling airflow from flowing to the gap between the inner surface of the first accommodating cavity (11) and the outer ring of the outer bearing component (2). The second accommodating cavity (13) is provided with an annular secondary sealing groove (131), which is used to cooperate with a pre-set sealing ring to prevent cooling airflow from flowing to the gap between the inner surface of the second accommodating cavity (13) and the outer ring of the inner bearing component (3).

6. A cooling device for a roller kiln according to claim 1, characterized in that: The first accommodating cavity (11) is also provided with a primary temperature sensor, which is used to detect the temperature of the outer bearing component (2). The second accommodating cavity (13) is provided with a secondary temperature sensor, which is used to detect the temperature of the inner bearing component (3).

7. A cooling device for a roller kiln according to claim 3, characterized in that: The air guide hole (142) can be positioned at an angle.

8. A cooling device for a roller kiln according to claim 3, characterized in that: One end of the air inlet (141) extends to the outer end face of the bearing housing (1) and is connected to a pre-set gas input device, which is used to produce or transport cooling air.

9. A cooling device for a roller kiln according to claim 1, characterized in that: The cooling device also includes a fixing component and a positioning component (8). The fixing component is used to position and fix the outer bearing component (2), and the positioning component (8) is used to position and fix the inner bearing component (3). The fixing component and the positioning component (8) are both made of heat-resistant material.

10. A cooling device for a roller kiln according to claim 1, characterized in that: Both the outer bearing component (2) and the inner bearing component (3) are deep groove ball bearing components without a sealing structure.

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