Non-woven fabric hot roller capable of accurately adjusting regional temperature

Abstract

The invention discloses a non-woven fabric hot roller capable of accurately adjusting the area temperature, and relates to the technical field of non-woven fabric processing, the non-woven fabric hot roller comprises two fixing frames which are symmetrically fixed on hot processing equipment; the circulating port is formed in one of the fixing frames and is communicated with an external mold temperature controller through an oil pipe; the sealing end cover is fixed to the sides, close to each other, of the two fixing frames; the roller body is rotationally arranged between the two sealing end covers; the pressurization ports and the adsorption ports are evenly formed in the sealing end cover in a circumferential mode and distributed in a staggered mode, the pressurization ports are communicated with external pressurization equipment, and the adsorption ports are communicated with external extraction equipment; the adjusting assembly is installed in the roller body and communicates with the pressurizing opening and the adsorption opening.

Description

Technical Field

[0001] This invention relates to the field of nonwoven fabric processing technology, specifically a nonwoven fabric hot rolling roll with precisely adjustable zone temperature. Background Technology

[0002] Hot rolling mills are key equipment in nonwoven fabric production. They use high temperature and high pressure to thermally fuse and bond the fiber web, thereby giving the nonwoven fabric a certain strength and feel. Traditional heating methods for hot rolling mills mainly include electric heating and heat transfer oil heating. Among them, heat transfer oil heating is widely used because of its uniform and stable temperature and high safety.

[0003] However, existing heat transfer oil heated rollers have a significant drawback: their roller bodies are usually a single hollow cavity, with the heat transfer oil circulating inside. This results in the roller surface temperature at the oil inlet being higher than that at the oil outlet. Furthermore, the overall roller surface temperature is not synchronously regulated. In actual production, due to edge effects, uneven fiber distribution, or product structure requirements (such as the need to create a high-strength area in the center of the width and a soft area on both sides), it is often necessary to differentiate the temperature control of different areas of the roller surface. Traditional one-piece roller bodies cannot achieve this precise regional temperature control, leading to lower product quality.

[0004] To address the above problems, this invention provides a nonwoven fabric hot rolling roll with precisely adjustable zone temperature to solve the aforementioned issues. Summary of the Invention

[0005] To achieve the above objectives, the present invention provides the following technical solution: a nonwoven fabric hot rolling roll with precisely adjustable zone temperature, comprising:

[0006] The mounting brackets are configured as two, symmetrically fixed on the heat processing equipment;

[0007] The circulation port is located on one of the fixed brackets and is connected to an external mold temperature controller via an oil pipe;

[0008] A sealing end cap is fixed to one side of the two fixing brackets that are close to each other;

[0009] The roller body is rotatably disposed between the two sealing end caps;

[0010] The pressurization port and the adsorption port are evenly distributed around the circumference of the sealing end cover and are staggered. The pressurization port is connected to an external pressurization device, and the adsorption port is connected to an external extraction device.

[0011] An adjustment component is installed inside the roller body and is connected to the pressure inlet and the adsorption inlet.

[0012] Furthermore, preferably, a main channel is provided at the axial center of the roller body, one end of which is connected to the circulation port. Multiple oil inlets are arranged circumferentially at one end of the main channel away from the circulation port, and multiple oil outlets are arranged circumferentially at the other end. A heating chamber is provided near the outer wall of the roller body, with both ends of the heating chamber connected to the oil inlets and outlets respectively. Guide fins are fixed inside the heating chamber. A sealing element is fixed in the middle of the main channel, and an oil inlet pipe is fixed inside the sealing element. The oil inlet pipe is connected to the circulation port by a rotary joint.

[0013] Furthermore, preferably, the guide fins are spiral-shaped, and their pitch forms a spiral heating channel, wherein the flow area of ​​the heating channel decreases sequentially from the oil inlet to the oil outlet.

[0014] Further, preferably, the adjustment component includes:

[0015] A heat-conducting sleeve is sealed and fixed inside the heating chamber and is fixedly connected to the flow-guiding fins;

[0016] A heat-conducting layer is fixed between the heat-conducting sleeve and the heating chamber, and is located in the middle of the roller body;

[0017] Two elastic layers are configured, both fixed to the outer wall of the heat-conducting sleeve, and symmetrically arranged on both sides of the heat-conducting layer.

[0018] Furthermore, preferably, the inner and outer walls of the heat-conducting layer are respectively attached to the outer wall of the heat-conducting sleeve and the outer wall of the heating chamber, and the inner and outer walls of the elastic layer are respectively attached to the outer wall of the heat-conducting sleeve and the outer wall of the heating chamber under negative pressure, and the heat-conducting sleeve, the heat-conducting layer and the elastic layer have the same heat conduction efficiency.

[0019] Furthermore, preferably, the end of the elastic layer away from the heat-conducting layer has a beveled cut, and the beveled cut forms an adjustment port between the heating chamber and the adjustment port. Multiple connecting holes are formed around the circumference of the adjustment port, and the connecting holes are connected to an annular groove. The annular groove is formed on the end face of the roller body and is connected to the pressurization port and the adsorption port.

[0020] Furthermore, preferably, both the pressurization port and the adsorption port are equipped with control valves, and the pressurization port and the adsorption port are started independently in sequence.

[0021] Furthermore, preferably, the elastic layer is controlled and adjusted through the pressurization port and the adsorption port, and is divided into two adjustment modes;

[0022] Mode 1: When the nonwoven fabric has high precision requirements for the edge low temperature area, pressure is increased into the adjustment port through the pressure inlet, and the elastic layer gradually moves away from the heating chamber from the adjustment port towards the heat-guiding layer, thus forming precise length control of the edge low temperature area;

[0023] Mode 2: Based on Mode 1, pressurize the regulating port and adjust the gap between the elastic layer and the heating chamber to form precise temperature control in the edge low-temperature zone.

[0024] Compared with the prior art, the present invention provides a nonwoven fabric hot rolling roll with precisely adjustable zone temperature, which has the following beneficial effects:

[0025] In this invention, by alternately applying positive and negative pressure through the adjustment port, the contact state between the elastic layer and the inner wall of the heating chamber (tight fit or gap formation) can be independently controlled. This allows for the creation of different temperature zones along the axial direction of the roller surface. For example, the middle area of ​​the roller can be kept at a high temperature to provide the main hot rolling function, while the two edge areas can form controllable low-temperature zones. This achieves precise axial zoning and gradient control of the roller surface temperature. Furthermore, the length of the deformation zone can be controlled through mode one, and the width of the low-temperature zone can be precisely controlled to adapt to the process requirements of different widths of nonwoven fabric edge structures. Through mode two, the gap size of the deformation zone can be controlled, and the temperature value of the low-temperature zone can be adjusted. Attached Figure Description

[0026] Figure 1 A schematic diagram of the overall structure of a nonwoven fabric hot rolling roll with precisely adjustable zone temperature;

[0027] Figure 2 This is a schematic diagram of the internal structure of a nonwoven fabric hot rolling roll with precisely adjustable zone temperature.

[0028] Figure 3 This is a schematic diagram of the guide fin structure of a nonwoven hot rolling roll with precisely adjustable zone temperature.

[0029] Figure 4 A cross-sectional schematic diagram of the internal structure of a nonwoven fabric hot rolling roll with precisely adjustable zone temperature;

[0030] Figure 5 for Figure 4 Enlarged structural diagram at point A in the middle;

[0031] In the diagram: 1. Fixed frame; 2. Circulation port; 3. Sealing end cap; 4. Roller body; 5. Pressure boosting port; 6. Adsorption port; 7. Adjustment component; 41. Main channel; 42. Oil inlet; 43. Heating chamber; 44. Oil outlet; 45. Oil inlet pipe; 46. Seal; 47. Guide fins; 471. Heating channel; 71. Heat-conducting sleeve; 72. Heat-conducting layer; 73. Elastic layer; 74. Beveled cut; 75. Annular groove; 76. Connecting hole. Detailed Implementation

[0032] Reference Figures 1-5 This invention provides a technical solution: a nonwoven fabric hot rolling roll with precisely adjustable zone temperature, comprising:

[0033] The mounting bracket 1 is configured as two, symmetrically fixed on the heat processing equipment;

[0034] The circulation port 2 is located on one of the fixed frames 1 and is connected to an external mold temperature controller via an oil pipe;

[0035] The sealing end cap 3 is fixed on one side of the two fixing brackets 1 that are close to each other;

[0036] Roller 4 is rotatably disposed between the two sealing end caps 3;

[0037] The pressurization port 5 and the adsorption port 6 are evenly distributed around the circumference of the sealing end cover 3 and are staggered. The pressurization port 5 is connected to an external pressurization device, and the adsorption port 6 is connected to an external extraction device.

[0038] Adjustment component 7 is installed inside the roller body 4 and is connected to the pressure inlet 5 and the adsorption inlet 6.

[0039] In this embodiment, a main channel 41 is provided at the axial position of the roller body 4. One end of the main channel 41 is connected to the circulation port 2. Multiple oil inlets 42 are arranged circumferentially at one end of the main channel 41 away from the circulation port 2, and multiple oil outlets 44 are arranged circumferentially at the other end. A heating chamber 43 is provided near the outer wall of the roller body 4. The two ends of the heating chamber 43 are connected to the oil inlets 42 and the oil outlets 44, respectively. A guide fin 47 is fixed inside the heating chamber 43. A sealing element 46 is fixed at the middle position of the main channel 41. An oil inlet pipe 45 is fixed inside the sealing element 46. The oil inlet pipe 45 is connected to the circulation port 2 by a rotary joint.

[0040] In other words, by adding guide fins 47 to the heating chamber 43, the heat exchange efficiency with the heat transfer oil can be improved, and the oil flow dead zone can be avoided.

[0041] Preferably, the guide fins 47 are spiral-shaped, and their pitch forms a spiral heating channel 471, the flow area of ​​which decreases sequentially from the oil inlet 42 to the oil outlet 44.

[0042] Among them, the spiral guide fins 47 form a spiral heating channel 471, which can force the heat transfer oil to spiral forward along the roller body 4, greatly enhance the heat exchange efficiency, avoid oil flow dead zone, and more importantly, the flow area decreases sequentially from the oil inlet 42 to the oil outlet 44, which can automatically compensate for the temperature loss caused by the process length, and ensure the uniformity of heat transfer oil flow rate and heat transfer coefficient along the entire flow channel length, thereby providing a uniform axial basic temperature field for the roller body 4.

[0043] In a preferred embodiment, the adjustment component 7 includes:

[0044] The heat-conducting sleeve 71 is sealed and fixed inside the heating chamber 43 and is fixedly connected to the flow guide fins 47;

[0045] The heat-conducting layer 72 is fixed between the heat-conducting sleeve 71 and the heating chamber 43, and is located in the middle of the roller body 4;

[0046] Two elastic layers 73 are configured, both fixed to the outer wall of the heat-conducting sleeve 71, and symmetrically arranged on both sides of the heat-conducting layer 72.

[0047] It should be noted that the heat-conducting sleeve 71 and the heat-conducting layer 72 constitute an efficient reference heat conduction path, while the physical state (adhesion or separation) of the symmetrically arranged elastic layer 73 can be controlled, thereby achieving local and dynamic adjustment of the thermal resistance of a specific area without changing the overall heat transfer oil temperature and flow rate.

[0048] In addition, the inner and outer walls of the heat-conducting layer 72 are respectively attached to the outer wall of the heat-conducting sleeve 71 and the outer wall of the heating chamber 43. Under negative pressure, the inner and outer walls of the elastic layer 73 are respectively attached to the outer wall of the heat-conducting sleeve 71 and the outer wall of the heating chamber 43. The heat-conducting sleeve 71, the heat-conducting layer 72 and the elastic layer 73 have the same heat conduction efficiency.

[0049] It should be noted that the heat-conducting layer 72 is always in a state of high-efficiency heat conduction, providing a stable high-temperature reference for the roller body 4. At the same time, the elastic layer 73 is also in a state of high-efficiency heat conduction under negative pressure. In other words, by changing the state of the elastic layer 73, it is possible to switch between high-efficiency heat conduction and variable thermal resistance, and the heat transfer efficiency of the reference area is not affected before and after the switch, thus ensuring the accuracy of control.

[0050] Preferably, the elastic layer 73 has a beveled slit 74 at one end away from the heat-conducting layer 72. An adjustment port is formed between the beveled slit 74 and the heating chamber 43. A plurality of connecting holes 76 are formed around the adjustment port. The connecting holes 76 are connected to an annular groove 75. The annular groove 75 is formed on the end face of the roller body 4 and is connected to the pressurization port 5 and the adsorption port 6.

[0051] In a preferred embodiment, both the pressurization port 5 and the adsorption port 6 are equipped with control valves, and the pressurization port 5 and the adsorption port 6 are started independently in sequence.

[0052] The installation of control valves and their independent activation in sequence allows for independent pressure control of the annular groove 75 in different areas. This enables independent and precise control of the temperature in different areas along the axial direction of the roller body 4. For example, the temperature of the low-temperature zone on the left can be adjusted independently without affecting the low-temperature zone on the right, thus achieving independent and precise temperature control in multiple areas.

[0053] In a preferred embodiment, the elastic layer 73 is controlled and adjusted by the pressurization port 5 and the adsorption port 6, and is divided into two adjustment modes;

[0054] Mode 1: When the nonwoven fabric has high precision requirements for the edge low temperature area, pressure is increased into the adjustment port through the pressure inlet 5, and the elastic layer 73 gradually moves away from the heating chamber 43 from the adjustment port towards the heat-guiding layer 72, thus forming precise length control of the edge low temperature area.

[0055] Mode 2: Based on Mode 1, further increase the gap between the elastic layer and the heating chamber 43 inside the adjustment port to form precise temperature control in the edge low-temperature region.

[0056] It should be noted that the pressure is injected slowly into the regulating port to facilitate control of the width of the low-temperature zone, so that the deformation of the elastic layer 73 is a smooth, orderly process that gradually progresses from one end to the other.

[0057] In other words, the pressure slowly increases from zero. When the pressure reaches the initial threshold, the weakest point of the structure, the oblique cut 74, overcomes the adhesion resistance first, and the elastic layer 73 begins to partially peel off from the inner wall of the heating chamber 43, forming a tiny initiation bubble. As the pressure continues to increase slowly, the peeling boundary will stably and uniformly expand from the oblique cut 74 towards the heat-conducting layer 72. When the pressure reaches the target value, the deformation position stops exactly at the corresponding width. At this time, a uniformly thick air gap is formed between the elastic layer 73 and the inner wall of the heating chamber 43, completing the setting of mode one. If it is necessary to adjust the air gap to control the edge temperature, pressure is injected into the air gap to make the entire elastic layer 73 detach from the inner wall of the heating chamber 43. Then, the size of the air gap is controlled by adjusting the pressure value, completing the setting of mode two.

[0058] In addition, when the contact resistance between the elastic layer 73 and the inner wall of the heating chamber 43 gradually increases from the oblique cut 74 to the heat-conducting layer 72, a resistance gradient can be formed, which can be formed by the oblique setting of the outer wall of the heat-conducting sleeve 71.

[0059] At this time, the adjustment method of the elastic layer 73 further includes a cooperative control mode: First, by controlling the first pressure value in the adjustment port, the axial length of the gap between the elastic layer 73 and the inner wall of the heating chamber 43 is precisely controlled to a target value L. Then, while maintaining the axial length L of the gap basically unchanged, the actual pressure in the adjustment port is adjusted within a small pressure range based on the first pressure value to change the average size of the gap, thereby achieving independent and precise temperature control in the region of length L. At this time, because the adhesion resistance of the elastic layer 73 gradually increases, the gap can be adjusted by controlling the pressure to be less than the adhesion resistance, achieving dual precise control of length and temperature, but its temperature adjustment range is limited.

[0060] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A nonwoven fabric hot rolling roll with precisely adjustable zone temperature, characterized in that, include: The mounting bracket (1) is configured as two, symmetrically fixed on the heat treatment equipment; The circulation port (2) is located on one of the fixed frames (1) and is connected to an external mold temperature controller via an oil pipe; The sealing end cap (3) is fixed on one side of the two fixing brackets (1) that are close to each other; The roller body (4) is rotatably disposed between the two sealing end caps (3); The pressurization port (5) and the adsorption port (6) are evenly arranged on the sealing end cap (3) and are staggered. The pressurization port (5) is connected to the external pressurization equipment, and the adsorption port (6) is connected to the external extraction. The adjustment component (7) is installed inside the roller body (4) and is connected to the pressurization port (5) and the adsorption port (6).

2. The nonwoven fabric hot rolling roll with precisely adjustable zone temperature according to claim 1, characterized in that, The roller body (4) has a main channel (41) at its axial center. One end of the main channel (41) is connected to the circulation port (2). Multiple oil inlets (42) are arranged around the circumference of the main channel (41) away from the circulation port (2), and multiple oil outlets (44) are arranged around the circumference of the other end. A heating chamber (43) is provided near the outer wall of the roller body (4). The two ends of the heating chamber (43) are connected to the oil inlet (42) and the oil outlet (44) respectively. A guide fin (47) is fixed inside the heating chamber (43). A sealing element (46) is fixed in the middle of the main channel (41). An oil inlet pipe (45) is fixed inside the sealing element (46). The oil inlet pipe (45) is connected to the circulation port (2) by a rotary joint.

3. A nonwoven fabric hot rolling roll with precisely adjustable zone temperature according to claim 2, characterized in that, The guide fins (47) are spiral-shaped, and their pitch forms a spiral heating channel (471). The flow area of ​​the heating channel (471) decreases sequentially from the oil inlet (42) to the oil outlet (44).

4. A nonwoven fabric hot rolling roll with precisely adjustable zone temperature according to claim 3, characterized in that, The adjustment component (7) includes: The heat-conducting sleeve (71) is sealed and fixed inside the heating chamber (43) and is fixedly connected to the flow guide fins (47); The heat-conducting layer (72) is fixed between the heat-conducting sleeve (71) and the heating chamber (43), and is located in the middle of the roller body (4); Two elastic layers (73) are configured, both fixed to the outer wall of the heat-conducting sleeve (71) and symmetrically arranged on both sides of the heat-conducting layer (72).

5. A nonwoven fabric hot rolling roll with precisely adjustable zone temperature according to claim 4, characterized in that, The inner and outer walls of the heat-conducting layer (72) are respectively attached to the outer wall of the heat-conducting sleeve (71) and the outer wall of the heating chamber (43). The inner and outer walls of the elastic layer (73) are respectively attached to the outer wall of the heat-conducting sleeve (71) and the outer wall of the heating chamber (43) under negative pressure. The heat-conducting sleeve (71), the heat-conducting layer (72) and the elastic layer (73) have the same heat conduction efficiency.

6. A nonwoven fabric hot rolling roll with precisely adjustable zone temperature according to claim 4, characterized in that, The elastic layer (73) has a bevel (74) at one end away from the heat-conducting layer (72). An adjustment port is formed between the bevel (74) and the heating chamber (43). A plurality of connecting holes (76) are formed around the adjustment port. The connecting holes (76) are connected to an annular groove (75). The annular groove (75) is formed on the end face of the roller body (4) and is connected to the pressurizing port (5) and the adsorption port (6).

7. A nonwoven fabric hot rolling roll with precisely adjustable zone temperature according to claim 6, characterized in that, Both the pressurization port (5) and the adsorption port (6) are equipped with control valves, and the pressurization port (5) and the adsorption port (6) are started independently in sequence.

8. A nonwoven fabric hot rolling roll with precisely adjustable zone temperature according to claim 7, characterized in that, The elastic layer (73) is controlled and adjusted through the pressurization port (5) and the adsorption port (6), and is divided into two adjustment modes; Mode 1: When the nonwoven fabric has high precision requirements for the edge low temperature area, pressure is increased into the adjustment port through the pressure inlet (5), and the elastic layer (73) gradually moves away from the heating chamber (43) from the adjustment port towards the heat-conducting layer (72), thus forming precise length control of the edge low temperature area; Mode 2: Based on Mode 1, pressurize the regulating port and adjust the gap between the elastic layer and the heating chamber (43) to form precise temperature control of the edge low temperature area.

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