Extrusion processing liquid nitrogen cooling device

Abstract

The utility model relates to extrusion processing cooling technical field especially extrusion processing's liquid nitrogen cooling device, including support pad seat, the upper end of support pad seat is provided with round groove, the lower extreme of support pad seat is provided with the mounting groove of linkage with round groove, the inner chamber of mounting groove is installed with lead out mechanism, the inner chamber integration of round groove is installed with first annular strip and second annular strip, the outside of second annular strip is provided with the flow groove of equidistance, the inner chamber bottom of round groove is provided with liquid nitrogen hole, the inner chamber bottom of round groove is provided with flow hole with equidistance, compared with prior art, the utility model discloses the support pad seat of liquid nitrogen cooling under the premise of not increasing production cost, realized the substantial promotion of cooling performance, effectively avoided the product deformation problem, significantly improved the production quality stability of product, effectively improved the cooling use effect.

Description

Technical Field

[0001] This utility model relates to the field of extrusion processing technology, and in particular to a liquid nitrogen cooling device for extrusion processing. Background Technology

[0002] Extrusion processing refers to placing a pre-prepared billet into an extrusion cylinder, applying pressure, and forcing the material to be extruded from the opening of the container. During extrusion, the material is under unequal triaxial compressive stress and its strain is axial elongation. During the extrusion process, the temperature of both the extruded aluminum alloy workpiece and the die will rise. Since the high-temperature extruded workpiece and the die are exposed to the air, hard alumina particles are generated on the surface of the aluminum alloy workpiece, and some of them adhere to the die exit, causing scratches on the surface of subsequent workpieces and scratches on the die surface. This results in uneven and defective product surfaces. Therefore, the cooling process for extruded alloy workpieces is crucial.

[0003] Current extrusion cooling methods have many problems. Some methods require large-scale modifications to the extrusion machine, which takes a long time. Moreover, each product requires a separate mold design, which seriously affects the normal extrusion processing production schedule, resulting in high investment costs and wasted time. At the same time, the cooling effect of some cooling devices is not ideal, which leads to product deformation and seriously affects product quality. To address this issue, we provide a liquid nitrogen cooling device for extrusion processing. Utility Model Content

[0004] The purpose of this invention is to overcome the defects in the existing technology and provide a liquid nitrogen cooling device for extrusion processing.

[0005] To achieve the above objectives, the technical solution of this utility model is to design a liquid nitrogen cooling device for extrusion processing, including a support pad, a circular groove at the upper end of the support pad, an installation groove communicating with the circular groove at the lower end of the support pad, an outlet mechanism installed in the inner cavity of the installation groove, a first annular bar and a second annular bar integrally installed in the inner cavity of the circular groove, flow grooves equidistantly arranged on the outer side of the second annular bar, a liquid nitrogen inlet hole at the bottom end of the inner cavity of the circular groove, and flow holes equidistantly arranged at the bottom end of the inner cavity of the circular groove.

[0006] The discharge mechanism includes a base disposed in the inner cavity of the mounting groove, a discharge hole is provided in the middle of the base, and L-shaped holes communicating with the inner wall of the discharge hole are provided at equal intervals on the upper surface of the base, with each L-shaped hole corresponding to the position of the flow hole.

[0007] In a further preferred embodiment, a sealing gasket is bonded to the inner cavity of the circular groove. The sealing gasket is located between the outer side of the first annular strip and the inner wall of the circular groove. The height of the sealing gasket is flush with the height of the support pad. The first annular strip and the second annular strip have the same height, and the height of the first annular strip is lower than the height of the sealing gasket.

[0008] In a further preferred embodiment, the inner cavity of the mounting groove is provided with threaded holes at equal intervals, and the base is screwed to the threaded holes by a number of bolts.

[0009] In a further preferred embodiment, the upper surface of the base is integrally connected with inserts that match the positions of the L-shaped holes at equal intervals. A washer is provided on the upper surface of the base. The inserts are inserted into the flow holes. The outer diameter of the inserts matches the inner diameter of the flow holes. The washer is located between the upper surface of the base and the lower end of the flow holes.

[0010] In a further preferred embodiment, a connecting pipe is provided on the outer side of the support pad, and the connecting pipe is screwed into the inner cavity of the liquid nitrogen inlet.

[0011] A further preferred technical solution is that the outer side of the support pad is provided with a groove.

[0012] The advantages and beneficial effects of this utility model are as follows: 1. With the design of the support pad, there is no need to modify the original extruder. Only the support pad needs to be replaced, which greatly reduces the cost of equipment modification. Moreover, the replacement process is short and can be quickly put into normal production, reducing the production downtime cost caused by equipment modification. In addition, the base of the support pad can be disassembled and replaced. The guide hole in the middle of the base is designed with different sizes according to the size of the tubular workpiece, which effectively reduces the production cost and improves the use effect.

[0013] 2. Pressurized liquid nitrogen rapidly fills the space between the first and second annular bars, cooling one end of the extrusion die. Then, liquid nitrogen flows evenly from multiple equidistant channels between the second annular bar and the outer side of the base, cooling the area near the extrusion exit of the die. As the die cools, the heat from the tubular workpiece being extruded inside is gradually transferred to the die. This cycle continues, with liquid nitrogen continuously sprayed into the inner cavity of the circular channels, effectively cooling both the die and the extruded tubular workpiece. This effectively prevents the workpiece temperature at the die exit from becoming too high, providing sealed cooling to prevent high-temperature exposure to air and the formation of alumina particles adhering to the die exit, which would affect the quality of subsequent product processing. This increases the die's service life and improves the cooling and protection effect on the workpiece.

[0014] 3. Liquid nitrogen then enters the L-shaped hole through the flow orifice and insertion tube, and finally is stably and evenly sprayed onto the surface of the tubular workpiece through multiple sets of L-shaped holes, effectively cooling the tubular workpiece. The evaporated nitrogen gas eventually fills the inner cavity of the outlet hole, thus protecting the tubular workpiece with nitrogen gas and preventing the surface of the tubular workpiece from oxidation caused by direct contact with air. This effectively improves the compression cooling protection effect of the tubular workpiece. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall three-dimensional structure proposed in this utility model;

[0016] Figure 2 This is a partial, sectional, three-dimensional structural diagram of the present invention.

[0017] Figure 3 This is a half-sectional perspective view of the three-dimensional structure of the support pad proposed in this utility model;

[0018] Figure 4 This is a schematic diagram of the disassembled three-dimensional structure of the export mechanism proposed in this utility model;

[0019] Figure 5 This is a half-sectional three-dimensional structural diagram of the support pad and the guide mechanism proposed in this utility model;

[0020] Figure 6 This is a three-dimensional structural diagram of the support pad proposed in this utility model.

[0021] In the diagram: 1. Support pad; 2. Circular groove; 3. First annular bar; 4. Second annular bar; 5. Flow channel; 6. Flow hole; 7. Mounting groove; 8. Outlet mechanism; 81. Base; 82. Bolt; 83. Washer; 84. Outlet hole; 85. L-shaped hole; 86. Insert tube; 9. Sealing gasket; 10. Liquid nitrogen inlet; 11. Connecting tube; 12. Embedded groove; 13. Threaded hole. Detailed Implementation

[0022] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0023] Reference Figure 1-3 As shown in Figure 5, a liquid nitrogen cooling device for extrusion processing includes a support pad 1. The outer side of the support pad 1 is provided with a groove 12. The entire support pad 1 is inserted and installed in the extrusion equipment through the groove 12. This is the prior art and will not be described in detail here. Its main purpose is to ensure that the entire support pad 1 can stably fit with the extrusion die, so that the support pad 1 can perform normal cooling operations on the die and the workpiece.

[0024] The upper end of the support pad 1 is provided with a circular groove 2, and the lower end of the support pad 1 is provided with an installation groove 7 that communicates with the circular groove 2. The inner cavity of the circular groove 2 is integrally installed with a first annular strip 3 and a second annular strip 4. A sealing gasket 9 is bonded to the inner cavity of the circular groove 2. The sealing gasket 9 is located between the outer side of the first annular strip 3 and the inner wall of the circular groove 2. The height of the sealing gasket 9 is flush with the height of the support pad 1. The heights of the first annular strip 3 and the second annular strip 4 are the same, and the height of the first annular strip 3 is lower than the height of the sealing gasket 9.

[0025] When the end of the extrusion die that is in contact with the inner cavity of the circular groove 2 is accurately embedded, it first contacts the sealing gasket 9 and then continues to penetrate into the inner cavity of the circular groove 2. At this time, the end of the extrusion die pushes the sealing gasket 9 until the compression height of the sealing gasket 9 is flush with the first annular strip 3. At this time, the end of the extrusion die completes the purpose of fitting with the support pad 1. Through the design of the sealing gasket 9, after being compressed, its rubber material has the rebound performance, so that the sealing gasket 9 has the elastic force of reverse reset. Thus, the sealing gasket 9 and the end of the extrusion die can fit tightly together, avoiding the problem that the poor sealing between the support pad 1 and the extrusion die during liquid nitrogen cooling will cause insufficient pressure of the sprayed liquid nitrogen, thus affecting its cooling effect.

[0026] The outer side of the second annular strip 4 is provided with equidistant flow channels 5, the bottom of the inner cavity of the circular groove 2 is provided with a liquid nitrogen inlet 10, and the outer side of the support pad 1 is provided with a connecting pipe 11, which is screwed to the inner cavity of the liquid nitrogen inlet 10.

[0027] After being connected to the connecting pipe 11 via an external liquid nitrogen pressurization and spraying device, pressurized liquid nitrogen is sprayed into the liquid nitrogen inlet 10 through the connecting pipe 11. The liquid nitrogen instantly fills the space between the first annular bar 3 and the second annular bar 4, thereby cooling one end of the extrusion die. Subsequently, the liquid nitrogen flows evenly from multiple sets of equidistantly designed flow channels 5 into the space between the second annular bar 4 and the outer side of the base 81, thereby cooling the area near the extrusion exit of the extrusion die. After the extrusion die is cooled, the heat from the tubular workpiece being extruded inside is gradually conducted to the extrusion die. This cycle continues, and the liquid nitrogen is continuously sprayed into the inner cavity of the circular groove 2, thereby continuously and effectively cooling the extrusion die and the extruded tubular workpiece. This effectively prevents the workpiece temperature at the die exit from becoming too high, and provides sealed cooling to prevent high temperature exposure to air, which would cause aluminum oxide particles to adhere to the die exit and affect the quality of subsequent product processing. This increases the service life and improves the cooling protection effect of the workpiece.

[0028] Reference Figure 2 , 4As shown in Figure 6, flow holes 6 are equidistantly arranged at the bottom of the inner cavity of the circular groove 2. An outlet mechanism 8 is installed in the inner cavity of the mounting groove 7. The outlet mechanism 8 includes a base 81 disposed in the inner cavity of the mounting groove 7. An outlet hole 84 is provided in the middle of the base 81. L-shaped holes 85 that communicate with the inner wall of the outlet hole 84 are equidistantly arranged on the upper surface of the base 81. Each L-shaped hole 85 corresponds to the position of the flow hole 6. Threaded holes 13 are equidistantly arranged in the inner cavity of the mounting groove 7. The base 81 is screwed to the threaded holes 13 by a number of bolts 82.

[0029] The upper surface of the base 81 is integrally connected with insert tubes 86 that match the position of L-shaped holes 85. A washer 83 is provided on the upper surface of the base 81. The insert tube 86 is inserted into the flow hole 6. The outer diameter of the insert tube 86 matches the inner diameter of the flow hole 6. The washer 83 is located between the upper surface of the base 81 and the lower end of the flow hole 6.

[0030] The base 81 is screwed and fixed to the inner cavity of the mounting groove 7 by bolts 82. The designed washers 83 further improve the airtightness of the connection between the insertion tube 86 and the flow hole 6, ensuring the pressure of the liquid nitrogen jet and preventing any impact on its cooling effect. Thus, after the liquid nitrogen enters between the second annular strip 4 and the outer side of the base 81, it quickly passes through the flow hole 6 into the insertion tube 86, then through the insertion tube 86 into the L-shaped hole 85, and finally sprays out through multiple sets of equidistant L-shaped holes 85. The outlet hole 84 in the middle of the base 81 can be customized according to different tubular shapes. The size of the workpiece is designed to control the distance between the inner wall of the outlet hole 84 and the outer side of the tubular workpiece. This allows liquid nitrogen to be sprayed stably and evenly from the L-shaped hole 85 onto the surface of the tubular workpiece, effectively cooling it. During the cooling process, the liquid nitrogen comes into contact with the high temperature, causing it to vaporize and release nitrogen gas. This nitrogen gas fills the inner cavity of the outlet hole 84, thus providing nitrogen-filled protection for the just-cooled tubular workpiece. This prevents the tubular workpiece from oxidizing due to direct contact with air, effectively improving the compression cooling protection effect of the tubular workpiece.

[0031] Working Principle: This utility model, through its designed support pad 1, eliminates the need for equipment modification of the original extruder (the original extruder is an existing technology and will not be elaborated upon here). During normal downtime maintenance of the original extruder, the original extrusion support pad is simply removed, and this support pad 1 is directly installed in the original support pad's mounting position, ensuring a secure installation. It only requires replacing the support pad 1, significantly reducing equipment modification costs. The replacement process is quick, allowing for rapid resumption of normal production and minimizing production downtime costs caused by equipment modifications. Furthermore, the base of the support pad is removable and replaceable. Different sized outlet holes in the center of the base are designed according to the size of the tubular workpiece, effectively reducing production costs and improving performance. During operation, the end of the extrusion die that is in contact with the mold is embedded into the inner cavity of the circular groove 2 and pressed tightly against the sealing gasket 9. This ensures a tight fit between the sealing gasket 9 and the end of the extrusion die, preventing insufficient pressure of the sprayed liquid nitrogen during liquid nitrogen cooling due to poor sealing between the support pad 1 and the extrusion die. Subsequently, an externally equipped independent liquid nitrogen supply system provides a stable supply of liquid nitrogen according to different extrusion process requirements, facilitating precise control of the flow rate and pressure. Then, the external liquid nitrogen booster spray device is connected to the connecting pipe 11 through a pipeline, and the pressurized liquid nitrogen is sprayed into the liquid nitrogen inlet 10 through the connecting pipe 11. The liquid nitrogen instantly fills the space between the first annular bar 3 and the second annular bar 4. The space is designed to cool one end of the extrusion die. Liquid nitrogen then flows evenly from multiple equidistantly designed flow channels 5 into the space between the second annular strip 4 and the outer side of the base 81, thus cooling the area near the extrusion exit of the extrusion die. After the extrusion die cools, the heat from the tubular workpiece being extruded inside is gradually conducted to the extrusion die. This cycle continues, with liquid nitrogen continuously sprayed into the inner cavity of the circular groove 2, effectively cooling both the extrusion die and the extruded tubular workpiece. This effectively prevents the workpiece temperature at the die exit from becoming too high, providing sealed cooling to prevent high-temperature exposure to air from causing alumina particles to adhere to the die exit, affecting the quality of subsequent product processing and thus increasing the risk of defects. This process extends service life and improves the cooling and protection effect of the workpiece. Finally, liquid nitrogen rapidly enters the insertion tube 86 through the flow hole 6, then flows through the insertion tube 86 into the L-shaped hole 85, and finally exits through multiple sets of equidistant L-shaped holes 85. The outlet hole 84 in the middle of the base 81 can be designed according to different sizes of tubular workpieces, making the distance between the inner wall of the outlet hole 84 and the outer side of the tubular workpiece controllable. This effectively allows liquid nitrogen to be stably and evenly sprayed from the L-shaped holes 85 onto the surface of the tubular workpiece, effectively cooling it. During the cooling process, the liquid nitrogen comes into contact with the high temperature, causing it to vaporize and release nitrogen gas. This nitrogen gas fills the inner cavity of the outlet hole 84, thus providing nitrogen-filled protection for the just-cooled tubular workpiece.This design avoids surface oxidation of tubular workpieces caused by direct contact with air, effectively improving the protection against extrusion and cold air.

[0032] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An extrusion processing liquid nitrogen cooling device comprising a support pad, characterized by, The upper end of the support pad is provided with a circular groove, and the lower end of the support pad is provided with an installation groove that communicates with the circular groove. An outlet mechanism is installed in the inner cavity of the installation groove. A first annular bar and a second annular bar are integrally installed in the inner cavity of the circular groove. Flow grooves are provided at equal intervals on the outer side of the second annular bar. A liquid nitrogen inlet hole is provided at the bottom end of the inner cavity of the circular groove, and flow holes are provided at equal intervals at the bottom end of the inner cavity of the circular groove. The discharge mechanism includes a base disposed in the inner cavity of the mounting groove, a discharge hole is provided in the middle of the base, and L-shaped holes communicating with the inner wall of the discharge hole are provided at equal intervals on the upper surface of the base, with each L-shaped hole corresponding to the position of the flow hole.

2. The liquid nitrogen cooling device for extrusion processing according to claim 1, wherein A sealing gasket is bonded to the inner cavity of the circular groove. The sealing gasket is located between the outer side of the first annular strip and the inner wall of the circular groove. The height of the sealing gasket is flush with the height of the support pad. The first annular strip and the second annular strip are at the same height, and the height of the first annular strip is lower than the height of the sealing gasket.

3. The liquid nitrogen cooling device for extrusion processing according to claim 1, wherein The mounting groove has threaded holes spaced at equal intervals in its inner cavity, and the base is screwed into the threaded holes by a number of bolts.

4. The liquid nitrogen cooling device for extrusion processing according to claim 1, wherein The upper surface of the base is integrally connected with inserts that match the positions of the L-shaped holes at equal intervals. A washer is provided on the upper surface of the base. The inserts are inserted into the flow holes. The outer diameter of the inserts matches the inner diameter of the flow holes. The washer is located between the upper surface of the base and the lower end of the flow holes.

5. The liquid nitrogen cooling device for extrusion processing according to claim 1, wherein A connecting pipe is provided on the outer side of the support pad, and the connecting pipe is screwed into the inner cavity of the liquid nitrogen inlet.

6. The liquid nitrogen cooling device for extrusion processing according to claim 1, wherein The outer side of the support pad is provided with a groove.

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