A heat exchange roller with a spiral flow channel tending to zero temperature difference for a longitudinal drawing machine

Abstract

The present invention relates to the technical field of biaxially stretched optical film production, specifically to a zero temperature difference spiral flow channel heat exchange roller of a longitudinal stretching machine, comprising a heat transfer cylinder body, a first end cover and a second end cover, wherein the first end cover and the second end cover are distributed at both ends of the heat transfer cylinder body, a flow guide mechanism and a spiral sheet are arranged inside the heat transfer cylinder body, the flow guide mechanism comprises a reflux pipe, a liquid inlet pipe and a partition, the outer surface of the reflux pipe is sleeved with a connecting seat, the outer surface of the connecting seat is sleeved with a ball bearing and a liquid inlet joint, the liquid inlet joint is movably connected to the connecting seat through a ball bearing, the outer surface of the liquid inlet joint is provided with an arc groove, a sealing ring is embedded in the arc groove, the outer surface of the connecting seat is sleeved with an umbrella-shaped sealing hoop, the umbrella-shaped sealing hoop is against the sealing ring, and the outer surface of the umbrella-shaped sealing hoop is sleeved with a fixed cover. The present invention has an umbrella-shaped sealing hoop, which improves dynamic sealing and keeps the roller surface temperature difference close to zero.

Description

Technical Field

[0001] The invention relates to the technical field of biaxially stretched optical film production, in particular to a zero temperature difference spiral flow channel heat exchange roller of a longitudinal stretching machine. Background Art

[0002] The biaxially oriented film industry is a very important branch of the plastics industry. The biaxially oriented film equipment is the main component of the hot drawing machine, and the heat exchange roller is an extremely important component. The heat exchange roller includes the runner heating roller, electromagnetic heating roller, and steam heating roller.

[0003] Different from other roller types, runner rollers can switch freely between heating and cooling, and have always been the mainstream of current biaxially oriented film rollers.

[0004] The main factor affecting the quality of stretched optical film is the heat exchange effect of the biaxially stretched film roller. The more uniform the heat on the roller surface, the better the quality of the stretched optical film. To achieve uniform heat exchange on the roller surface, the best way is to let the roller roll at a constant speed. The biggest problem with existing rolling rollers is the sealing problem at the heat conduction tube, which is easy to cause leakage.

[0005] Therefore, it is urgent to design a zero temperature difference spiral flow channel heat exchange roller of a longitudinal drawing machine to solve the above problems. Summary of the invention

[0006] The object of the present invention is to provide a heat exchange roller with a spiral flow channel tending to zero temperature difference for a longitudinal drawing machine, so as to solve the problem of leakage easily caused at the heat conduction pipe proposed in the above background technology.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a heat exchange roller with a zero temperature difference spiral flow channel of a longitudinal drawing machine, comprising a heat transfer cylinder, a first end cover and a second end cover, wherein the first end cover and the second end cover are distributed at both ends of the heat transfer cylinder, a flow guide mechanism and a spiral sheet are arranged inside the heat transfer cylinder, the flow guide mechanism comprises a return pipe, a liquid inlet pipe and a partition, the return pipe is sleeved on the outside of the liquid inlet pipe, a liquid discharge pipe is evenly distributed on the surface of the return pipe, and the inner cavity of the liquid inlet pipe is connected with the inner cavity of the heat transfer cylinder through the liquid discharge pipe, and the outer surface of the return pipe is evenly distributed. A through hole is evenly provided, and a connecting seat is sleeved on the outer surface of the reflux pipe, and a ball bearing and a liquid inlet joint are sleeved on the outer surface of the connecting seat, and the liquid inlet joint is movably connected to the connecting seat through the ball bearing, and an arc groove is provided on the outer surface of the liquid inlet joint, and a sealing ring is embedded in the arc groove, and an umbrella-shaped sealing hoop is sleeved on the outer surface of the connecting seat, and the umbrella-shaped sealing hoop abuts against the sealing ring, and a fixed cover is sleeved on the outer surface of the umbrella-shaped sealing hoop, one end of the fixed cover abuts against the umbrella-shaped sealing hoop, and the other end of the fixed cover is fixedly connected to the second end cover by bolts.

[0008] Preferably, the side of the first end cover that abuts against the heat transfer cylinder body is in a truncated cone shape, and a conical sealing ring is sandwiched between the first end cover and the heat transfer cylinder body.

[0009] Preferably, one end of the reflux pipe and the liquid inlet pipe abuts against the center of the first end cover, and the other end of the reflux pipe and the liquid inlet pipe passes through the center of the second end cover.

[0010] Preferably, spiral blades are evenly fixed on the outer surface of the reflux pipe, the spiral blades are arranged in a spiral, a heat exchange cavity is formed between two adjacent spiral blades and the heat transfer cylinder body, and the surface thickness of the spiral blades increases clockwise from the discharge pipe toward the through hole.

[0011] Preferably, the partition is arranged between the drain pipe and the through hole, and two sides of the partition are fixedly connected to the spiral sheet, and the outer surface of the spiral sheet is wrapped with a heat-conducting tube.

[0012] Preferably, the thickness of the heat-conducting tube decreases clockwise from the drain pipe toward the through hole, and the two ends of the partition are fixedly connected to the return pipe and the heat-conducting tube respectively.

[0013] Preferably, the outer surface of the connecting seat is conical, and the shape of the inner wall of the liquid inlet joint is consistent with the shape of the outer surface of the connecting seat.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: the zero temperature difference spiral flow channel heat exchange roller of the longitudinal drawing machine has an umbrella-shaped sealing hoop, which improves the dynamic sealing performance and maintains the zero temperature difference of the roller surface.

[0015] (1) A connecting seat is fixed on the outer surface of the reflux pipe, and a liquid inlet joint is movably connected to the outer surface of the connecting seat. A sealing ring is embedded in the joint between the liquid inlet joint and the connecting seat. The sealing ring is abutted by an umbrella-shaped sealing hoop fixed on the connecting seat to ensure the movable sealing between the liquid inlet joint and the connecting seat. The sealing ring can always be tightly abutted between the liquid inlet joint and the connecting seat through the abutment of the umbrella-shaped sealing hoop, so as to avoid affecting the sealing between the liquid inlet joint and the connecting seat after the sealing ring is worn, thereby improving the dynamic sealing.

[0016] (2) By evenly fixing spiral blades on the return pipe and increasing the thickness of the spiral blades from the discharge pipe to the through hole, the water flow toward the through hole becomes more aggressive. Increasing the flow rate can take away more heat. The heat loss during the water flow makes the roller surface temperature approach zero. Combined with the insulation of the heat transfer tube, the uniformity of heat exchange is further improved. At the same time, the thickest part of the heat transfer tube is exactly opposite to the thickest part of the spiral blade, which just makes up for the weight difference between the upper and lower ends of the exchange roller and ensures the dynamic balance of the exchange roller. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic front view of the structure of the present invention;

[0018] Figure 2 It is a schematic cross-sectional front view of the structure of the present invention;

[0019] Figure 3 It is a schematic cross-sectional side view of the structure of the present invention;

[0020] Figure 4 For the present invention Figure 1 Schematic diagram of the overall structure of the heat transfer cylinder and the flow guide mechanism;

[0021] Figure 5 For the present invention Figure 2 A schematic diagram of the structure enlargement in the middle;

[0022] Figure 6 For the present invention Figure 2 A magnified schematic diagram of the structure at B in the middle;

[0023] Figure 7 For the present invention Figure 2 Schematic diagram of the structural side view of the middle umbrella-shaped sealing hoop.

[0024] In the figure: 1, heat transfer cylinder body; 2, first end cover; 3, second end cover; 4, heat transfer cylinder; 5, flow guide mechanism; 51, reflux pipe; 52, liquid inlet pipe; 53, liquid discharge pipe; 54, partition; 55, through hole; 6, spiral sheet; 7, liquid inlet joint; 8, fixing cover; 9, connecting seat; 10, ball bearing; 11, sealing ring; 12, umbrella-shaped sealing hoop. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] See also Figure 1-7 , the embodiment provided by the present invention:

[0027] A heat exchange roller with a zero temperature difference spiral flow channel of a longitudinal drawing machine comprises a heat transfer barrel 1, a first end cover 2 and a second end cover 3, wherein the first end cover 2 and the second end cover 3 are distributed at both ends of the heat transfer barrel 1, a flow guiding mechanism 5 and a spiral sheet 6 are arranged inside the heat transfer barrel 1, and the flow guiding mechanism 5 comprises a return pipe 51, a liquid inlet pipe 52 and a partition 54, the return pipe 51 is sleeved on the outside of the liquid inlet pipe 52, a liquid discharge pipe 53 is evenly distributed on the surface of the return pipe 51, and the inner cavity of the liquid inlet pipe 52 is connected with the inner cavity of the heat transfer barrel 1 through the liquid discharge pipe 53, and through holes 55 are evenly opened on the outer surface of the return pipe 51, and the inner cavity of the heat transfer barrel 1 is connected with the inner cavity of the return pipe 51 through the through holes 55, the heat exchange medium enters through the liquid inlet pipe 52, and is discharged into the heat transfer barrel 1 through the liquid discharge pipe 53 for heat exchange, and is discharged into the return pipe 51 through the through holes 55 after heat exchange, and is discharged through the return pipe 51 to form a cycle.

[0028] The outer surface of the reflux pipe 51 is sleeved with a connecting seat 9, and the outer surface of the connecting seat 9 is sleeved with a ball bearing 10 and a liquid inlet joint 7. The liquid inlet joint 7 is movably connected to the connecting seat 9 through the ball bearing 10. The outer surface of the liquid inlet joint 7 is provided with an arc groove, and a sealing ring 11 is embedded in the arc groove. The sealing ring 11 is abutted between the liquid inlet joint 7 and the connecting seat 9 to ensure the sealing between the liquid inlet joint 7 and the connecting seat 9. The outer surface of the connecting seat 9 is sleeved with an umbrella-shaped sealing hoop 12, and the sealing ring 11 is abutted by the umbrella-shaped sealing hoop 12 fixed on the connecting seat 9 to ensure the sealing between the liquid inlet joint 7 and the connecting seat 9. The movable sealing performance is achieved through the resistance of the umbrella-shaped sealing hoop 12, so that the sealing ring 11 can always be tightly pressed against the liquid inlet joint 7 and the connecting seat 9, to avoid the sealing ring 11 being worn and affecting the sealing performance between the liquid inlet joint 7 and the connecting seat 9. The umbrella-shaped sealing hoop 12 is pressed against the sealing ring 11, and a fixed cover 8 is provided on the outer surface of the umbrella-shaped sealing hoop 12. One end of the fixed cover 8 is pressed against the umbrella-shaped sealing hoop 12, and the other end of the fixed cover 8 is fixedly connected to the second end cover 3 by bolts. The fixed cover 8 limits the umbrella-shaped sealing hoop 12 and protects the sealing ring 11 and the umbrella-shaped sealing hoop 12 at the same time.

[0029] Further, such as Figure 5 As shown, the side of the first end cover 2 that abuts against the heat transfer cylinder body 1 is in a truncated cone shape, and a conical sealing ring is sandwiched between the first end cover 2 and the heat transfer cylinder body 1 to improve the sealing between the first end cover 2 and the heat transfer cylinder body 1.

[0030] Further, such as Figure 2 As shown, one end of the reflux pipe 51 and the liquid inlet pipe 52 abuts against the center of the first end cover 2, and a positioning groove (not shown) is opened in the center of the first end cover 2 to facilitate the fixed connection of the reflux pipe 51 and the liquid inlet pipe 52 with the first end cover 2, and the other end of the reflux pipe 51 and the liquid inlet pipe 52 passes through the center of the second end cover 3, so as to facilitate the connection with the external pipeline.

[0031] Further, such as Figure 2 As shown, spiral blades 6 are evenly fixed on the outer surface of the return pipe 51, and the spiral blades 6 are arranged in a spiral. A heat exchange cavity is formed between two adjacent spiral blades 6 and the heat transfer cylinder body 1. The surface thickness of the spiral blades 6 increases clockwise from the drain pipe 53 toward the through hole 55, so that the water flow state toward the through hole 55 is more radical. Taking the heat exchange roller that plays a cooling role as an example, increasing the flow rate can take away more heat, and the heat loss in the water flow makes the roller surface temperature approach zero.

[0032] Further, such as Figure 2-3 As shown, the partition 54 is arranged between the drain pipe 53 and the through hole 55, and the two sides of the partition 54 are fixedly connected to the spiral sheet 6. The outer surface of the spiral sheet 6 is wrapped with a heat-conducting tube 4. The thickest part of the heat-conducting tube 4 is just opposite to the thickest part of the spiral sheet 6, which just makes up for the weight difference between the upper and lower ends of the exchange roller and ensures the dynamic balance of the exchange roller.

[0033] Further, such as Figure 2-3 As shown, the thickness of the heat-conducting tube 4 decreases clockwise from the drain pipe 53 toward the through hole 55 , and the two ends of the partition plate 54 are fixedly connected to the return pipe 51 and the heat-conducting tube 4 respectively.

[0034] Further, such as Figure 2 As shown, the outer surface of the connecting seat 9 is conical, and the inner wall shape of the liquid inlet joint 7 is consistent with the outer surface shape of the connecting seat 9. The conical contact surface utilizes the characteristic of water flowing to lower places to reduce the occurrence of liquid leakage, and cooperates with the sealing ring 11 to achieve a better sealing effect.

[0035] Working principle: When in use, the pipe for providing heat transfer medium from the outside is fixedly connected to the liquid inlet joint 7, the heat exchange medium enters from the liquid inlet pipe 52, and the heat exchange medium flows into the heat exchange cavity through the liquid discharge pipe 53, and flows clockwise to the through hole 55 in the heat exchange cavity to exchange heat with the heat transfer cylinder body 1. The temperature of the heat exchange medium determines the temperature of the surface of the heat transfer cylinder body 1. By evenly fixing the spiral sheet 6 on the return pipe 51, and increasing the thickness of the spiral sheet 6 from the liquid discharge pipe 53 to the through hole 55, the water flow state flowing toward the through hole 55 is more radical, and increasing the flow rate can take away more heat. The heat loss in the water flow makes the roller surface temperature approach zero, and combined with the heat insulation of the heat transfer cylinder 4, the uniformity of heat exchange is further improved. At the same time, the thickest part of the heat transfer cylinder 4 is just opposite to the thickest part of the spiral sheet 6, which just makes up for the weight difference between the upper and lower ends of the exchange roller and ensures the dynamic balance of the exchange roller.

[0036] A sealing ring 11 is embedded at the joint between the liquid inlet connector 7 and the connecting seat 9 , and the sealing ring 11 is abutted by an umbrella-shaped sealing hoop 12 fixed on the connecting seat 9 to ensure the sealing performance of the movement between the liquid inlet connector 7 and the connecting seat 9 .

[0037] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and all variations falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A heat exchange roller with a zero temperature difference spiral flow channel of a longitudinal drawing machine, comprising a heat transfer cylinder (1), a first end cover (2) and a second end cover (3), wherein the first end cover (2) and the second end cover (3) are distributed at both ends of the heat transfer cylinder (1), and characterized in that: The heat transfer cylinder (1) is provided with a flow guiding mechanism (5) and spiral sheets (6) inside. The flow guiding mechanism (5) comprises a return pipe (51), a liquid inlet pipe (52) and a partition (54). The return pipe (51) is sleeved on the outside of the liquid inlet pipe (52). Liquid discharge pipes (53) are evenly distributed on the surface of the return pipe (51). The inner cavity of the liquid inlet pipe (52) is connected to the inner cavity of the heat transfer cylinder (1) through the liquid discharge pipe (53). Through holes (55) are evenly opened on the outer surface of the return pipe (51). A connecting seat (9) is sleeved on the outer surface of the connecting seat (9). A ball bearing (10) and a liquid inlet joint (7) are provided, wherein the liquid inlet joint (7) is movably connected to a connecting seat (9) via the ball bearing (10), an arc groove is provided on the outer surface of the liquid inlet joint (7), a sealing ring (11) is embedded in the arc groove, an umbrella-shaped sealing hoop (12) is sleeved on the outer surface of the connecting seat (9), the umbrella-shaped sealing hoop (12) abuts against the sealing ring (11), a fixing cover (8) is sleeved on the outer surface of the umbrella-shaped sealing hoop (12), one end of the fixing cover (8) abuts against the umbrella-shaped sealing hoop (12), and the other end of the fixing cover (8) is fixedly connected to a second end cover (3) via a bolt; One end of the reflux pipe (51) and the liquid inlet pipe (52) abuts against the center of the first end cover (2), and the other end of the reflux pipe (51) and the liquid inlet pipe (52) penetrates the center of the second end cover (3); The outer surface of the return pipe (51) is evenly fixed with spiral blades (6), the spiral blades (6) are arranged in a spiral shape, and a heat exchange cavity is formed between two adjacent spiral blades (6) and the heat transfer cylinder (1), and the surface thickness of the spiral blades (6) increases clockwise from the discharge pipe (53) toward the through hole (55); The partition plate (54) is arranged between the drain pipe (53) and the through hole (55), and two sides of the partition plate (54) are fixedly connected to the spiral sheet (6), and the outer surface of the spiral sheet (6) is wrapped with a heat-conducting tube (4); The thickness of the heat-conducting tube (4) decreases clockwise from the drain pipe (53) toward the through hole (55), and the two ends of the partition plate (54) are fixedly connected to the return pipe (51) and the heat-conducting tube (4) respectively.

2. The zero temperature difference spiral flow channel heat exchange roller of the longitudinal drawing machine according to claim 1, characterized in that: The side of the first end cover (2) that abuts against the heat transfer cylinder (1) is in the shape of a truncated cone, and a conical sealing ring is sandwiched between the first end cover (2) and the heat transfer cylinder (1).

3. The zero temperature difference spiral flow channel heat exchange roller of the longitudinal drawing machine according to claim 1, characterized in that: The outer surface of the connecting seat (9) is conical, and the shape of the inner wall of the liquid inlet joint (7) matches the shape of the outer surface of the connecting seat (9).

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