Air-cooled grinding rollers for roller mills

Abstract

The present invention relates to an air-cooled grinding roller for a roller mill, comprising a roller body, a roller shaft and a heat dissipation device. The roller body is a hollow cylindrical structure with openings at both ends. The roller shaft is arranged at both ends of the roller body, and the roller shaft is inserted into the inner cavity of the roller body from both ends of the roller body. The roller shaft is provided with an air vent that communicates with the inner cavity of the roller body. The heat dissipation device is provided in the inner cavity of the roller body. The heat dissipation device comprises a heat-conducting tube and spiral heat dissipation fins. The heat-conducting tube is a hollow cylindrical structure. The outer wall of the heat-conducting tube is tightly fitted with the inner wall of the roller body. The spiral heat dissipation fins are fixedly connected to the inner wall of the heat-conducting tube. The spiral gap of the spiral heat dissipation fins and the inner hole of the spiral heat dissipation fins form a heat dissipation air duct. The present invention has a simple structure and low cost. By arranging a fin heat dissipation device in the roller body of the grinding roller to improve the heat dissipation and cooling effect of air cooling, the cooling effect of the grinding roller can be effectively improved, and the cooling requirement of the grinding roller can be met.

Description

Technical field:

[0002] The invention belongs to the technical field of grain processing machinery and equipment, and particularly relates to an air-cooled grinding roller used on a roller grinding mill. Background technology:

[0004] Roller mills are essential processing equipment in the grain milling industry, and the rollers are their core components. The rollers squeeze and scrape grain particles, thereby crushing and grinding them. During the crushing and grinding process, the compression and friction between the rollers and the grain generate a significant amount of heat. Although some of this heat is dissipated by the grain, prolonged operation causes a significant amount of heat to accumulate within the rollers, raising roller temperatures. Under stable thermal equilibrium, roller temperatures can reach 60-70°C or even higher. If the rollers are not cooled promptly during processing, their heat is transferred to the grain, denaturing proteins and heat-sensitive vitamins, significantly reducing the quality of the milled grain. Furthermore, elevated grain temperatures cause moisture to evaporate from the grain particles, making them brittle and susceptible to inclusion of bran into the product. In severe cases, the high temperatures can cause the grains to burn, impacting product quality. Furthermore, the evaporated moisture condenses upon cooling, causing the material to clump and mold. Therefore, it is crucial to take measures to reduce the roller temperature.

[0005] In order to solve the heat dissipation problem of the grinding roller, the existing technical solutions include water cooling and air cooling. Water cooling sets a cooling channel inside the grinding roller, passes cooling water into the cooling channel, and uses the cooling water to cool the grinding roller. However, the grinding roller with water cooling needs to ensure the sealing between the rotating grinding roller and the stationary inlet and outlet water pipes, and also needs to set up a water circulation system, which is prone to cooling water leakage. If the leaked cooling water enters the grain material, it is easy to seriously affect the quality of the material. Air cooling is to convey cold air into the grinding roller, and use the cold air to take away the heat generated by the grinding roller, thereby achieving the purpose of cooling the grinding roller. However, the existing air-cooled cooling grinding rollers are usually designed with a hollow structure. This structure has a poor cooling effect and the grinding roller cooling effect is not obvious. Summary of the invention:

[0007] In summary, in order to overcome the shortcomings of the existing technical problems, the present invention provides an air-cooled grinding roller for a roller mill, which is equipped with a fin heat dissipation device in the inner cavity of the hollow grinding roller. The heat accumulated in the grinding roller is transferred to the fins for heat dissipation. The fins increase the heat dissipation area. The cold air passes through the fins to take away the heat emitted by the fins, thereby improving the cooling effect of the grinding roller and meeting the cooling requirements of the grinding roller.

[0008] In order to solve the above technical problems, the technical solution of the present invention is achieved as follows:

[0009] The roller mill has a plurality of heat dissipating fins, and the heat dissipating fins are connected to the roller mill through the heat dissipation mechanism.

[0010] The technical solution of the present invention can also be implemented as follows: the heat-conducting tube is a copper heat-conducting tube, and the spiral heat-dissipating fins are aluminum heat-dissipating fins.

[0011] The technical solution of the present invention can also be implemented as follows: the roller shaft is connected to the inner cavity of the roller body by threads, or the roller shaft is connected to the inner cavity of the roller body by interference fit.

[0012] The technical solution of the present invention can also be implemented as follows: the heat-conducting tube is connected to the inner cavity of the roller body by interference fit.

[0013] The technical solution of the present invention can also be implemented as follows: a sealing head is provided in the roller body, and the sealing head is arranged between the roller shaft and the heat-conducting cylinder.

[0014] The technical solution of the present invention can also be implemented as follows: the heat dissipation device includes multiple heat conducting plates and multiple heat sinks, the heat conducting plates and heat sinks are both annular thin plates, and the inner hole diameter of the heat conducting plates is larger than the inner hole diameter of the heat sink, the heat conducting plates and the heat sink are alternately arranged and fixed to each other to form a heat dissipation device with a tubular structure, multiple heat sinks form heat dissipation fins in the inner cavity of the tubular structure heat dissipation device, and the inner holes of the multiple heat sinks are interconnected to form a heat dissipation air duct, and the outer wall of the tubular structure heat dissipation device is tightly fitted with the inner wall of the roller body.

[0015] The technical solution of the present invention can also be implemented as follows: the thermal conductive sheet is a copper thermal conductive sheet, and the heat sink is an aluminum heat sink.

[0016] The technical solution of the present invention can also be implemented as follows: end heads are provided in the roller body, and the end heads are fixedly connected to the two ends of the heat dissipation device with a cylindrical structure.

[0017] The beneficial effects of the present invention are:

[0018] 1. The present invention provides a fin heat sink in the inner cavity of the hollow grinding roller. The heat accumulated in the grinding roller is transferred to the fins for heat dissipation. The fins increase the heat dissipation area. The cold air passes through the fins to take away the heat emitted by the fins, thereby improving the cooling effect of the grinding roller and meeting the cooling requirements of the grinding roller.

[0019] 2. The heat dissipation device of the present invention includes a copper heat-conducting tube and spiral aluminum heat-dissipating fins fixed on the inner wall of the heat-conducting tube. The copper heat-conducting tube has good thermal conductivity and can quickly transfer the heat generated by the roller body to the aluminum heat-dissipating fins. The aluminum heat-dissipating fins have a good heat dissipation effect. The dissipated heat is carried away by the cold air with a certain pressure entering from the vents of the roller shaft. The spiral aluminum heat-dissipating fins can make the cold air entering the roller body flow in a spiral shape, thereby increasing the contact area and contact time between the cold air and the heat-dissipating fins and improving the cooling effect.

[0020] 3. The heat dissipation device of the present invention comprises annular copper heat conducting fins and aluminum heat sinks that are alternately arranged and fixed to each other. The copper heat conducting fins are used to transfer the heat of the roller body to the aluminum heat sinks. Multiple aluminum heat sinks form heat dissipation fins for heat dissipation. This structure increases the contact area between the copper heat conducting fins and the aluminum heat sinks, further improving the heat transfer effect, thereby improving the cooling effect of the roller body.

[0021] 4. The present invention has a simple structure and low cost. By arranging a fin heat dissipation device in the roller body of the grinding roller to enhance the heat dissipation and cooling effect of air cooling, the cooling effect of the grinding roller can be effectively improved to meet the cooling requirements of the grinding roller. Description of the drawings:

[0023] Figure 1 A structural schematic diagram of the present invention;

[0024] Figure 2 This is another structural diagram of the present invention. Specific implementation method:

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0027] Example 1

[0028] like Figure 1As shown, an air-cooled grinding roller for a roller mill comprises a roller body 1, a roller shaft 2, and a heat sink. The roller body 1 is a hollow cylindrical structure with openings at both ends. The roller shaft 2 is disposed at both ends of the roller body 1 and is inserted into the inner cavity of the roller body 1 from both ends. The roller shaft 2 is threadedly connected to the inner cavity of the roller body 1. The roller shaft 2 is provided with a vent 3 that communicates with the inner cavity of the roller body 1. The inner cavity of the roller body 1 is provided with a heat sink. The heat sink is a fin heat sink, through which heat from the roller body 1 is dissipated. The heat sink comprises a heat-conducting tube 4 and spiral heat-conducting fins 5. The heat-conducting tube 4 is made of copper, and the spiral heat-conducting fins 5 are made of aluminum. The heat-conducting tube 4 is a hollow cylindrical structure, and its outer wall is tightly fitted with the inner wall of the roller body 1. The heat-conducting tube 4 is connected to the inner cavity of the roller body 1 by an interference fit. The spiral heat sink fins 5 are fixedly connected to the inner wall of the heat-conducting cylinder 4. The spiral gaps between the spiral heat sink fins 5 and the inner holes of the spiral heat sink fins 5 form a heat dissipation duct. The roller body 1 is provided with a sealing head 6, which is arranged between the roller shaft 2 and the heat-conducting cylinder 4. Cold air with a certain pressure enters the roller body 1 through the vents 3 of the roller shaft 2 at one end of the roller body 1 and flows out through the vents 3 of the roller shaft 2 at the other end of the roller body 1, removing heat from the heat sink during the flow.

[0029] When in use, the roller shaft 2 of the present invention is connected to the shell of the roller mill through a bearing assembly, and after being connected to the transmission device, the roller shaft 2 at one end of the roller body 1 is connected to the air inlet pipe through a rotating joint, and the roller shaft 2 at the other end of the roller body 1 is connected to the air outlet pipe through a rotating joint. The air inlet pipe is connected to a pressure cold air source, and the cold air with a certain pressure enters the inner cavity of the roller body 1 along the air inlet pipe and the air vent 3 of the roller shaft 2 at one end of the roller body 1, and then flows along the spiral gap of the spiral heat dissipating fins 5 and the inner hole of the spiral heat dissipating fins 5, flows out from the air vent 3 of the roller shaft 2 at the other end of the roller body 1, and then flows out from the air outlet pipe. The heat generated by the grinding roller of the roller mill is transferred to the spiral heat dissipating fins 5 through the copper heat conducting tube 4, and the heat emitted by the spiral heat dissipating fins 5 is taken away by the cold air flowing along the spiral gap and the inner hole of the spiral heat dissipating fins 5, thereby achieving the purpose of cooling the roller body 1.

[0030] Example 2

[0031] like Figure 2As shown, Example 1 is repeated with the following differences: the heat dissipation device includes multiple heat conducting fins 7 and multiple heat sinks 8. Both the heat conducting fins 7 and the heat sink 8 are annular thin sheets, and the inner diameter of the heat conducting fins 7 is larger than the inner diameter of the heat sink 8. The heat conducting fins 7 are copper heat conducting fins 7, and the heat sink fins 8 are aluminum heat sinks 8. The heat conducting fins 7 and the heat sink fins 8 are alternately arranged and fixed to each other, forming a cylindrical heat dissipation device. The multiple heat sinks 8 form heat dissipation fins within the inner cavity of the cylindrical heat dissipation device, and the inner holes of the multiple heat sinks 8 are interconnected to form a heat dissipation duct. The outer wall of the cylindrical heat dissipation device is tightly fitted to the inner wall of the roller body 1. The roller body 1 is provided with end caps 9, which are fixedly connected to both ends of the cylindrical heat dissipation device. The heat generated by the roller body 1 is quickly transferred to the aluminum heat sink 8 by the copper heat conducting sheet 7 for dissipation, and the dissipated heat is carried away by the cold air flowing along the heat dissipation air duct, thereby achieving the purpose of cooling the roller body 1. In this embodiment, multiple annular copper heat conducting sheets 7 and multiple aluminum heat sinks 8 are alternately arranged and fixed to each other. This structure increases the contact area between the copper heat conducting sheets 7 and the aluminum heat sink 8, further improves the heat transfer effect, and thus improves the cooling effect of the roller body 1.

[0032] It should be noted that the above-described embodiments are illustrative of the technical solutions of the present invention rather than limiting. Equivalent substitutions or other modifications made by ordinary technicians in the relevant technical field based on the existing technology should be included in the scope of rights required by the present invention as long as they do not exceed the concept and scope of the technical solutions of the present invention.

Claims

1. An air-cooled grinding roller for a roller mill, characterized in that: The roller body (1) comprises a roller body (1), a roller shaft (2) and a heat dissipation device. The roller body (1) is a hollow cylindrical structure with two ends open. The roller shaft (2) is arranged at both ends of the roller body (1), and the roller shaft (2) is inserted into the inner cavity of the roller body (1) from both ends of the roller body (1). The roller shaft (2) is provided with a vent (3) communicating with the inner cavity of the roller body (1). The inner cavity of the roller body (1) is provided with a heat dissipation device. The heat dissipation device is a fin heat dissipation device. The heat of the roller body (1) is dissipated through the heat dissipation device. The heat dissipation device comprises a heat-conducting tube (4) and spiral heat dissipating fins (5). The heat-conducting tube (4) It is a hollow cylindrical structure. The heat-conducting tube (4) is connected to the inner cavity of the roller body (1) by interference fit. The outer wall of the heat-conducting tube (4) is tightly fitted with the inner wall of the roller body (1). The spiral heat-dissipating fins (5) are fixedly connected to the inner wall of the heat-conducting tube (4). The spiral gaps of the spiral heat-dissipating fins (5) and the inner holes of the spiral heat-dissipating fins (5) form a heat-dissipating air duct. Cold air with a certain pressure enters the roller body (1) from the air vent (3) of the roller shaft (2) at one end of the roller body (1) and flows out from the air vent (3) of the roller shaft (2) at the other end of the roller body (1), taking away the heat emitted by the heat dissipation device during the flow.

2. The air-cooled grinding roller for a roller mill according to claim 1, wherein: The heat-conducting tube (4) is a copper heat-conducting tube, and the spiral heat-dissipating fins (5) are aluminum heat-dissipating fins.

3. The air-cooled grinding roller for a roller mill according to claim 1, wherein: The roller shaft (2) is connected to the inner cavity of the roller body (1) by threaded connection, or the roller shaft (2) is connected to the inner cavity of the roller body (1) by interference fit.

4. The air-cooled grinding roller for a roller mill according to claim 1, wherein: A sealing head (6) is provided in the roller body (1), and the sealing head (6) is arranged between the roller shaft (2) and the heat-conducting cylinder (4).

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