CN112026086A

CN112026086A - Cooling water tank device matched with main cold roller

Info

Publication number: CN112026086A
Application number: CN202010849742.7A
Authority: CN
Inventors: 张春华; 秦志红; 白汝佳; 杨丁卯; 陈诚发
Original assignee: Guangdong Simcheng Plastics Machinery Co Ltd
Current assignee: Guangdong Simcheng Plastics Machinery Co Ltd
Priority date: 2020-08-21
Filing date: 2020-08-21
Publication date: 2020-12-04

Abstract

The invention discloses a cooling water tank device matched with a main cold roll, which comprises a water tank with an upper opening, a cooling water spraying device arranged on the periphery of the main cold roll, a guide roller assembly for changing the winding direction of a film, a compression roller device arranged on the upper side of the main cold roll and an air knife water removing device arranged on the downstream of the compression roller device, wherein the guide roller assembly is arranged on the upper side of the main cold roll; the cooling water spraying device is used for spraying cooling water to the film; the compression roller device is used for pressing and removing water drops attached to the main cold roller; the air knife dewatering device is used for blowing off moisture on the main cold roll. After the film is cooled and formed, the casting enters a water tank for further cooling, so that the thicker unstretched film is timely and fully cooled under the combined action of cooling water and a main cooling roller, and the film cooling effect is enhanced.

Description

Cooling water tank device matched with main cold roller

Technical Field

The invention relates to the technical field of biaxially oriented film production, in particular to a cooling water tank device matched with a main cooling roller.

Background

At present, in the production process of plastic films, plastic in a molten state is extruded and poured onto the surface of a main cold roller from a flat die head lip, the plastic is rapidly cooled to form a film, then the film is sufficiently cooled along with the rotation and the conveying of the main cold roller, but the film is thicker when an unstretched biaxially oriented film (such as a BOPP film) is at least more than 0.8mm and is only pressed on the main cold roller by one side of the film for cooling, so that the cooling requirement on the unstretched film cannot be met, and the problems of low transparency, poor quality and the like of the film are caused.

It is seen that improvements and enhancements to the prior art are needed.

Disclosure of Invention

In view of the defects of the prior art, the invention aims to provide a cooling water tank device matched with a main cold roller, which aims to ensure that an unstretched film is fully cooled under the combined action of the main cold roller and a water tank and the quality of the film is ensured.

In order to achieve the purpose, the invention adopts the following technical scheme:

a cooling water tank device matched with a main cold roller comprises a water tank with an upper opening, a cooling water spraying device arranged on the periphery of the main cold roller, a guide roller assembly for changing the winding direction of a film, a compression roller device arranged on the upper side of the main cold roller, and an air knife water removing device arranged on the downstream of the compression roller device; the cooling water spraying device is used for spraying cooling water to the film; the compression roller device is used for pressing and removing water drops attached to the main cold roller; the air knife dewatering device is used for blowing off moisture on the main cold roll.

The cooling water spraying device comprises a distribution pipe and a plurality of water spraying pipes; each water spraying pipe is connected with the distribution pipe through a connecting pipe; the water spray pipe extends along the axial direction of the main cold roll, a plurality of water spray holes are uniformly arranged on the water spray pipe along the axial direction, and each water spray hole faces the film; the distribution pipe is connected with a high-pressure water pump.

The cooling water tank device matched with the main cold roll further comprises a film blowing device, the film blowing device comprises a first air knife positioned on the lower side of the die head, and the first air knife is used for blowing an air curtain to enable the film to be tightly attached to the roll surface of the main cold roll.

The film blowing device also comprises an air knife support and two sliding rails extending along the direction of the water tank, and the air knife support is connected with the sliding rails in a sliding manner through sliding blocks; the first air knife is arranged on the air knife support; and the air knife support is provided with a locking screw for fixing the position of the air knife support.

The compression roller device comprises a first air cylinder bracket, a first driving air cylinder arranged on the first air cylinder bracket, a first mounting block arranged on the output end of the first driving air cylinder, and a compression roller arranged on the first mounting block; the first driving cylinder is used for driving the compression roller on the first mounting block to be pressed on the main cooling roller.

The first cylinder support is arranged on a swing plate, the swing plate can swing around the axis of the main cold roll, and the axis of the first driving cylinder is intersected with the axis of the main cold roll.

The air knife dewatering device comprises a second air knife and a baffle arranged on the upper side of the second air knife, and an air outlet of the second air knife inclines towards the main cold roll and the compression roller device.

The guide roller assembly comprises a second air cylinder bracket, a second driving air cylinder arranged on the second air cylinder bracket, a second mounting block arranged on the output end of the second driving air cylinder, and a first guide roller arranged on the second mounting block; the first guide roller is used for changing the conveying direction of the film; the second driving cylinder is used for adjusting the tension of the first guide roller on the second mounting block to the film; the second cylinder bracket is arranged on the swing plate, the axis of the second driving cylinder is intersected with the axis of the main cold roll, the second mounting block is provided with a swing arm connected with a pivot, and a second guide roller is arranged at the free end of the swing arm; the swing plate is provided with a first support piece, the swing arm is provided with a second support piece, and a spring is arranged between the first support piece and the second support piece.

The cooling water tank device matched with the main cold roller further comprises a drainage device, and the drainage device comprises a first drainage pipe, an industrial cooling water unit and a second drainage pipe; the water tank is connected with the water inlet end of the industrial cooling water unit through a first water discharge pipe, and the second water discharge pipe is connected with the water outlet end of the industrial cooling water unit.

The water tank is characterized in that a guide rail extending along the length direction of the water tank is arranged below the water tank, roller assemblies for driving the water tank to move transversely are arranged on two sides of the water tank, and rollers in the roller assemblies are in rolling connection with the guide rail.

Has the advantages that:

compared with the prior art, the cooling water tank device matched with the main cold roller provided by the invention has the advantages that after the film is cooled and formed, the casting enters the water tank to realize further cooling, so that the thicker unstretched film is timely and fully cooled under the combined action of the cooling water and the main cold roller, and the film cooling effect is enhanced; in addition, the cooling water spraying device can also spray cooling water to the non-roll-sticking surface of the film, so that on one hand, the water around the film can form turbulent flow, the film can better exchange heat with the cooling water, and the cooling effect is prevented from being influenced by overhigh water temperature around the film; on the other hand, the cooling water spraying device can form certain water pressure, so that the film can still be tightly attached to the main cold roll in water, and the cooling effect of the roll attaching surface of the film is improved. And finally, the film leaves the water tank along with the rotation of the main cold roller, and then is separated from the main cold roller through the guide roller assembly, and the roller surface of the main cold roller, which is positioned between the guide roller assembly and the die head, can be subjected to dewatering and drying through the compression roller device and the air knife dewatering device in sequence, so that the influence of moisture on the film pouring effect on the roller surface is avoided.

Drawings

Fig. 1 is a schematic structural view of a cooling water tank device according to the present invention.

Fig. 2 is a partial enlarged view of the region L1 in fig. 1.

Fig. 3 is a partial enlarged view of the region L2 in fig. 1.

Fig. 4 is a schematic structural view of a spray pipe in the cooling water tank device according to the present invention.

Description of the main element symbols: 1-water tank, 2-cooling water spraying device, 3-press roll device, 4-air knife water removing device, 5-main cold roll, 6-die head, 21-distribution pipe, 22-water spraying pipe, 23-water spraying hole, 24-flow regulating valve, 7-film blowing device, 71-first air knife, 72-air knife support, 73-slide rail, 74-locking screw, 31-first air cylinder support, 32-first driving air cylinder, 33-first mounting block, 34-press roll, 35-swing plate, 41-second air knife, 42-baffle, 96-second air cylinder support, 97-second driving air cylinder, 98-second mounting block, 9 guide block, 91-first guide roll, 92-second guide roll, 93-first support piece, 94-a second support, 95-a spring, 8-a drainage device, 81-a first drainage pipe, 82-an industrial cooling water unit, 83-a second drainage pipe, 84-a valve and 10-a guide rail.

Detailed Description

The present invention provides a cooling water tank device cooperating with a main cooling roller, and in order to make the purpose, technical scheme and effect of the present invention clearer and clearer, the present invention will be further described in detail below by referring to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the scope of the invention.

Herein, the rotation direction of the main cooling roll 5 is the direction of the solid arrow in fig. 1, the direction indicated by the solid arrow is the downstream direction, the reverse direction is the upstream direction, the drawing direction of the film is the direction of the hollow arrow in fig. 1, and the directions indicated by the hollow arrow are the directions of "rear", "front" and "rear".

Referring to fig. 1-4, the present invention provides a cooling water tank device cooperating with a main cold roll, which includes a water tank 1 with an upper opening, a cooling water spraying device 2 disposed on the outer circumference of the main cold roll 5, a guide roller assembly 9 for changing the film winding direction, a pressing roller device 3 disposed on the upper side of the main cold roll 5, and an air knife dewatering device 4 disposed on the downstream of the pressing roller device 3; the cooling water spraying device 2 is used for spraying cooling water to the film; the compression roller device 3 is used for pressing and removing water drops attached to the main cold roller 5; the air knife water removal device 4 is used for blowing off water on the main cold roll 5. The main cooling roller 5 is provided in the water tub 1, and the upper part thereof is exposed out of the water tub 1, that is, a part of the roller surface of the main cooling roller 5 can be immersed in the water tub 1.

When the cooling device works, plastic in a molten state is extruded and poured onto the surface of the main cold roller 5 from the lip of the flat die head 6 and is rapidly cooled to form a film, the film 11 enters the water tank 1 along with the rotation of the main cold roller 5, the roll attaching surface of the film is attached to the main cold roller 5 to realize cooling, and the non-roll attaching surface of the film is immersed in cooling water to realize heat transfer; in addition, the cooling water spraying device 2 can also spray cooling water to the non-roll-sticking surface of the film, so that on one hand, the water around the film can form turbulent flow, the film can better exchange heat with the cooling water, and the cooling effect is prevented from being influenced by overhigh water temperature around the film; on the other hand, the cooling water injection device 2 can form a certain water pressure, so that the film can still be tightly attached to the main cold roll 5 in water, the cooling effect of the roller-attached surface of the film is improved, and the thicker unstretched film can be timely and fully cooled under the combined action of the cooling water and the main cold roll 5. Finally, the film leaves the water tank along with the rotation of the main cold roller, and then is separated from the main cold roller through the guide roller assembly, and the 5 roller surface of the main cold roller, which is positioned between the guide roller assembly 9 and the die head 6, can be subjected to dewatering and drying through the compression roller device 3 and the air knife dewatering device 4 in sequence, so that the effect of film casting is prevented from being influenced by the moisture attached to the roller surface.

Specifically, referring to fig. 1, the cooling water spraying device 2 includes a distribution pipe 21 and a plurality of water spraying pipes 22; each spray pipe 22 is connected with the distribution pipe 21 through a connecting pipe 25; the water spraying pipe 22 extends along the axial direction of the main cold roll 5, a plurality of water spraying holes 23 are uniformly arranged on the water spraying pipe 22 along the axial direction, and each water spraying hole 23 faces the main cold roll 5; the dispensing line 21 is connected to a high pressure water pump (not shown). Each of the connection pipes 25 is provided with a flow control valve 24, and the total flow of water sprayed from the water spraying holes 23 by the corresponding water spraying pipe 22 can be adjusted by adjusting the flow control valve 24, so that the impact force can be adjusted. In addition, the plurality of water spray pipes 22 are uniformly arranged at equal angles with the axis of the main cooling roller 5, the arrangement is reasonable, and the film cooling is sufficient.

In this embodiment, referring to fig. 1, three sets of water spraying pipes 22 in the cooling water spraying device 2 are correspondingly arranged according to the passing area of the film, the water spraying holes 23 of the first set of water spraying pipes 27 face the front end of the main cold roll 5, and the water spraying holes 23 of the second set of water spraying pipes 28 face the rear end of the main cold roll 5; a third set of water jets 29 is directed towards the film exiting the main cold roll 5. Under the spraying action of the three groups of water spraying pipes 22, the whole film can be cooled more fully, and the film quality is ensured. The injection pipe is arranged close to the film, cooling water is injected to the non-roller-sticking surface of the film, and the flow of the water around the film is enhanced by the injection water flow, so that the film can exchange heat with the cooling water better, and the cooling effect is prevented from being influenced by overhigh water temperature around the film.

Preferably, referring to fig. 1 and 3, the cooling water tank device further includes a film blowing device 7 disposed at the top of the water tank 1, the film blowing device 7 includes a first air knife 71 located at the lower side of the die head 6, the first air knife 71 blows out an air curtain, and the film just formed is attached to the roll surface of the main cold roll 5 in time by using air pressure, so as to achieve the purpose of reducing or eliminating the gap between the film and the main cold roll 5, thereby improving the cooling effect of the main cold roll 5 on the film, and on the other hand, the water in the water tank 1 can be reduced from permeating into the film 11 and the main cold roll 5, and affecting the heat exchange effect of the film 11 and the main cold roll 5.

Preferably, referring to fig. 3, the film blowing device 7 further includes an air knife support 72 and two slide rails 73 extending along the direction of the water tank 1, and the air knife support 72 is connected with the slide rails 73 in a sliding manner through a slider; the first air knife 71 is arranged on the air knife support 72; the air knife support 72 is provided with a locking screw 74 for fixing the position of the air knife support 72. When the position of the first air knife 71 needs to be adjusted, the locking screw 74 is loosened, the air knife support 72 is pushed, the distance between the first air knife 71 and the main cold roll 5 is adjusted, and then the locking screw 74 is tightened to complete the adjustment.

Preferably, referring to fig. 2, the pressing roller device 3 includes a first cylinder support 31, a first driving cylinder 32 disposed on the first cylinder support 31, a first mounting block 33 disposed on an output end of the first driving cylinder 32, and a pressing roller 34 disposed on the first mounting block 33; during operation, the first pressure roller 34 that drives on the first installation piece 33 of actuating cylinder 32 drive compresses tightly on main cold roll 5, and pressure roller 34 removes attached to the drop on main cold roll 5, can assemble after a plurality of drops become water and form rivers along the roll surface landing to carry out the primary drying to the roll surface of route pressure roller 34. Preferably, the number of the press rolls 34 is two, so as to further ensure the drying effect.

Preferably, referring to fig. 2, the first cylinder bracket 31 is arranged on a swing plate 35, the swing plate 35 can swing around the axis of the main cold roll 5, and the axis of the first driving cylinder 32 intersects with the axis of the main cold roll 5. The circumferential position of the press roll device 3 relative to the axial center of the main cold roll 5 can be adjusted by rotating the swinging plate 35.

Preferably, referring to fig. 2, the air knife water removing device 4 includes a second air knife 41 and a baffle 42 disposed on the upper side of the second air knife 41, and an air outlet of the second air knife 41 is inclined toward the main cooling roller 5 and toward the pressing roller device 3. The second air knife 41 blows away the moisture attached to the main cold roll 5 completely, ensures that the roller surface of the main cold roll 5 is dried thoroughly after passing through the air knife dewatering device 4, ensures that the roller surface of the main cold roll 5 is smooth and tidy, and avoids influencing the film casting effect, and in addition, the baffle 42 prevents water from splashing to the roller surface positioned at the downstream of the air knife dewatering device 4 when being blown off.

Preferably, referring to fig. 1 and 2, the guide roller assembly 9 includes a second cylinder frame 96, a second driving air 97 disposed on the second cylinder frame 96, a second mounting block 98 disposed on the output end of the second driving air 97, and a first guide roller 91 disposed on the second mounting block 98; the first guide roller 91 is used for changing the conveying direction of the film; the second driving cylinder 97 is used for adjusting the tension of the first guide roller 91 on the second mounting block 98 to the film; the second cylinder bracket 96 is arranged on the swing plate 35, the axis of the second driving cylinder 97 is intersected with the axis of the main cold roll 5, the second mounting block 98 is provided with a swing arm 99 which is in pivot connection, and the free end of the swing arm 99 is provided with a second guide roller 92; the swing plate 35 is provided with a first support piece 93, the swing arm is provided with a second support piece 94, and a spring 95 is arranged between the first support piece 93 and the second support piece 94. The film sequentially passes through a second guide roller 92 and a first guide roller 91, a spring 95 pulls a swing arm 99, the second guide roller 92 is pressed on the film, a film pressing line is formed between the second guide roller 92 and the film, the film is guided and pulled by the first guide roller 91 after passing through the film pressing line, so that the film is separated from the main cold roller 5, and then the film is pulled by a third guide roller 90 to enter the water tank 1 again for cooling.

Preferably, referring to fig. 1, the cooling water tank device further includes a drainage device 8, and the drainage device 8 includes a first drainage pipe 81, an industrial cooling water unit 82, and a second drainage pipe 83; the water tank 1 is connected with a water inlet end of an industrial cooling water unit 82 through a first water discharge pipe 81, a second water discharge pipe 83 is connected with a water outlet end of the industrial cooling water unit 82, a valve 84 is arranged on the first water discharge pipe 81 to control the amount of water entering the industrial cooling water unit 82, water in the water tank 1 flows back to a water storage tank through the second water discharge pipe 83 after being cooled by the industrial cooling water unit 82, then cooling water in the water storage tank is pumped by a high-pressure water pump and sent to a cooling water injection device 2, and the cooling water injection device 2 cools a film and can supplement water for the water tank 1. Of course, the reservoir is connected to the water tank 1 via a water inlet pipe 13, and the reservoir also sends water into the water tank 1 via a high pressure water pump. It should be noted that the industrial cooling water unit 82 is commercially available and will not be described herein.

Preferably, referring to fig. 1, a guide rail 10 extending along the length direction of the water tank 1 and a roller assembly for driving the water tank 1 to move transversely are arranged below the water tank 1, a roller in the roller assembly is connected with the guide rail 10 in a rolling manner, the roller assembly further comprises roller supports fixedly arranged on two sides of the water tank 1, the roller is connected with the roller supports in a rotating manner, and the roller can be driven by a motor. When the die head 6 needs to be replaced or maintained, the motor drives the roller to move, so that the water tank 1 and the main cold roller 5 in the water tank 1 move in the direction away from the die head 6, and a worker can replace and maintain the die head 6 conveniently and sufficiently. By moving water bath 1, the position of die head 6 from main cooling roll 5 can also be adjusted.

It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the protective scope of the present invention.

Claims

1. A cooling water tank device matched with a main cold roller is characterized by comprising a water tank with an upper opening, a cooling water spraying device arranged on the periphery of the main cold roller, a guide roller assembly for changing the winding direction of a film, a compression roller device arranged on the upper side of the main cold roller, and an air knife water removing device arranged on the downstream of the compression roller device; the cooling water spraying device is used for spraying cooling water to the film; the compression roller device is used for pressing and removing water drops attached to the main cold roller; the air knife dewatering device is used for blowing off moisture on the main cold roll.

2. The chilled water bath device in cooperation with a main chill roll of claim 1, wherein the chilled water spray device comprises a distribution pipe, and a plurality of spray pipes; each water spraying pipe is connected with the distribution pipe through a connecting pipe; the water spray pipe extends along the axial direction of the main cold roll, a plurality of water spray holes are uniformly arranged on the water spray pipe along the axial direction, and each water spray hole faces the film; the distribution pipe is connected with a high-pressure water pump.

3. The chilled water bath device of claim 1, further comprising a film blowing device comprising a first air knife positioned on the underside of the die head, the first air knife configured to blow a curtain of air against the roll surface of the primary chill roll.

4. The cooling water tank device matched with the main cold roll according to claim 3, wherein the film blowing device further comprises an air knife support and two slide rails extending along the direction of the water tank, and the air knife support is connected with the slide rails in a sliding manner through slide blocks; the first air knife is arranged on the air knife support; and the air knife support is provided with a locking screw for fixing the position of the air knife support.

5. The cooling water tank device matched with the main cold roller as claimed in claim 1, wherein the compression roller device comprises a first air cylinder bracket, a first driving air cylinder arranged on the first air cylinder bracket, a first mounting block arranged on the output end of the first driving air cylinder, and a compression roller arranged on the first mounting block; the first driving cylinder is used for driving the compression roller on the first mounting block to be pressed on the main cooling roller.

6. The cooling water tank device matched with the main cold roller as claimed in claim 5, wherein the first cylinder bracket is arranged on a swing plate, the swing plate can swing around the axis of the main cold roller, and the axis of the first driving cylinder is intersected with the axis of the main cold roller.

7. The cooling water tank device matched with the main cold roll according to claim 1, wherein the air knife water removing device comprises a second air knife and a baffle arranged on the upper side of the second air knife, and the air outlet of the second air knife is inclined towards the main cold roll and towards the compression roller device.

8. The chilled water tank device in cooperation with a main cold roller as claimed in claim 6, wherein the guide roller assembly comprises a second cylinder frame, a second driving cylinder provided on the second cylinder frame, a second mounting block provided on an output end of the second driving cylinder, and a first guide roller provided on the second mounting block; the first guide roller is used for changing the conveying direction of the film; the second driving cylinder is used for adjusting the tension of the first guide roller on the second mounting block to the film; the second cylinder bracket is arranged on the swing plate, the axis of the second driving cylinder is intersected with the axis of the main cold roll, the second mounting block is provided with a swing arm connected with a pivot, and a second guide roller is arranged at the free end of the swing arm; the swing plate is provided with a first support piece, the swing arm is provided with a second support piece, and a spring is arranged between the first support piece and the second support piece.

9. The chilled water bath device in cooperation with a main chill roll of claim 1, further comprising a drain arrangement comprising a first drain, an industrial cooling water train, and a second drain; the water tank is connected with the water inlet end of the industrial cooling water unit through a first water discharge pipe, and the second water discharge pipe is connected with the water outlet end of the industrial cooling water unit.

10. The cooling water tank device matched with the main cold roll as claimed in claim 1, wherein a guide rail extending along the length direction of the water tank is arranged below the water tank, roller assemblies for driving the water tank to move transversely are arranged on two sides of the water tank, and rollers in the roller assemblies are in rolling connection with the guide rail.