CN112356361A - Cooling system of biaxial stretching film - Google Patents

Abstract

The invention discloses a cooling system of a biaxial stretching film, which comprises a water tank with an upper opening, a roller body which is rotatably arranged in the water tank, a driving mechanism for driving the roller body to rotate, a spraying mechanism arranged in the inner cavity of the roller body, a first water supply mechanism for supplying cooling water to the spraying mechanism, and a first drainage mechanism for draining away accumulated water in the inner cavity of the roller body, wherein the spraying mechanism is arranged in the inner cavity of the roller body; the spraying mechanism is used for spraying cold water to the inner wall of the roller body to reduce the temperature; and a cooling water spraying device positioned on the periphery of the roller body is arranged in the water tank and used for spraying cooling water to the film. The cooling system of the biaxially oriented film provided by the invention can meet the cooling requirement of the unstretched biaxially oriented film and ensure the quality of the biaxially oriented film.

Description

Cooling system of biaxial stretching film

Technical Field

The invention relates to the technical field of biaxially oriented film production, in particular to a cooling system of a biaxially oriented film.

Background

At present, in a general plastic film production process, plastic in a molten state is extruded and poured onto the surface of a main cold roll from a flat die head lip, and is rapidly cooled to form a film (the thickness of the film is less than 0.2 mm), and then the film is continuously cast and cooled fully by the main cold roll; in the production process of a biaxially oriented film (such as a BOPP film), an unstretched film is thickened by a plurality of times compared with a common film, the thickness of the unstretched film is at least more than 0.8mm, only a main cooling roller of a spiral flow channel type is used for cooling the roll-attaching surface of the film, and the middle part and the non-roll-attaching surface of the film are difficult to be cooled timely and fully, so that the problems of low transparency, poor quality and the like of the film are caused; therefore, the cooling requirement of the unstretched film cannot be met, and the product quality of the biaxially oriented film is influenced.

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 system for a biaxially oriented film, which aims to meet the cooling requirement of an unstretched biaxially oriented film and ensure the quality of the biaxially oriented film.

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

a cooling system of a biaxial stretching film comprises a water tank with an upper opening, a roller body rotatably arranged in the water tank, a driving mechanism for driving the roller body to rotate, a spraying mechanism arranged in an inner cavity of the roller body, a first water supply mechanism for supplying cooling water to the spraying mechanism, and a first drainage mechanism for draining away accumulated water in the inner cavity of the roller body; the spraying mechanism is used for spraying cold water to the inner wall of the roller body to reduce the temperature; and a cooling water spraying device positioned on the periphery of the roller body is arranged in the water tank and used for spraying cooling water to the film.

The spraying mechanism comprises a plurality of main pipes and a plurality of branch pipes connected with the main pipes; a plurality of nozzles are axially arranged on the upper side of each branch pipe; each branch pipe comprises a connecting section and a spraying section, the spraying section extends along the direction of a central shaft of the roller body, and the nozzles are gradually and densely distributed along the center of the spraying section towards the directions of the two ends of the spraying section.

The roller body comprises a shaft head and a roller, the shaft head comprises a first shaft head and a second shaft head, the first shaft head comprises a side plate and a first shaft center, and the second shaft head comprises a side plate and a second shaft center; the first shaft head and the second shaft head are arranged at two ends of the roller; the first axis is in transmission connection with the driving mechanism; the second shaft is arranged in a hollow manner, and the first water supply mechanism and the first water discharge mechanism enter the roller through the second shaft; the water tank is characterized in that a bearing seat is arranged outside the water tank, and the first shaft head and the second shaft head penetrate through the inner wall of the water tank and are connected with the bearing seat.

The first water supply mechanism comprises a water inlet pipe which can penetrate through the second shaft center and extend into the roller body, the outer diameter of the water inlet pipe is smaller than the inner diameter of the second shaft center, a water diversion port is formed in one end of the water inlet pipe, and the spraying mechanism is communicated with the water inlet pipe through the water diversion port; be provided with the first bearing of a plurality of between inlet tube and the second axle center, first bearing cover is established on the outer wall of inlet tube, and the second axle center can rotate relative to the inlet tube.

The first drainage mechanism comprises a water outlet pipe and a water suction pipe arranged at one end part of the water outlet pipe; the water inlet pipe is sleeved outside the water outlet pipe in a sealing manner; the water suction pipe extends downwards, so that a water suction port of the water suction pipe is close to the bottom of the roller.

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 spraying pipe extends along the axial direction of the roller body, a plurality of water spraying holes are uniformly arranged on the water spraying pipe along the axial direction, and each water spraying hole faces the film; the distribution pipe is connected with a high-pressure water pump.

The cooling system of the biaxially oriented film further comprises a film blowing device, wherein 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 attached to the roll surface of the roll body.

The cooling system of the biaxially oriented film further comprises an air knife dewatering device, 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 is inclined towards the roller body and towards the upstream direction of the roller body.

A compression roller device is arranged at the upstream of the air knife water removal device, and comprises a swing plate, a first air cylinder support arranged on the swing plate, a first driving air cylinder arranged on the first air cylinder support, 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 roller body.

A guide roller assembly is arranged at the upstream of the compression roller device, and 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 roller body, 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.

Has the advantages that:

compared with the existing film cooling mode, the cooling system of the biaxial stretching film provided by the invention has the following advantages:

1. the heat exchange mode that the spray mechanism sprays the roll surface in the roll body is adopted, the roll surfaces at different positions of the roll are sprayed by cold water with the same temperature, the temperature difference of all parts on the roll is reduced, the heat exchange effect is good, a film is better cooled, the heat exchange method is essentially different from the heat exchange mode of a spiral flow channel, and the problem that the temperature difference of two ends of the roll is larger is fundamentally solved;

2. the sprayed cold water flows back to the bottom of the roller body to form a certain amount of accumulated water, so that the roller surface at the bottom of the roller body is cooled, the roller can more fully cool the film, cooling water resources are fully utilized, and the overall temperature of the roller body 2 is reduced;

3. the circumference of the roller body is long enough, the casting path of the film is increased, and the cooling is more timely and sufficient;

4. after the film is cooled and formed, the casting enters a water tank to realize further cooling, and the non-roller-sticking surface of the film is immersed in cooling water to realize heat transfer, so that the middle part and the non-roller-sticking surface of the film are effectively cooled;

5. 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.

Drawings

Fig. 1 is a first structural schematic diagram of a cooling system for a biaxially oriented film according to the present invention.

Fig. 2 is a schematic structural diagram of a cooling system for a biaxially oriented film according to the present invention.

Fig. 3 is a cross-sectional view a-a of fig. 2.

Fig. 4 is a partial enlarged view of the region L1 in fig. 2.

Fig. 5 is a partial enlarged view of the region L2 in fig. 1.

Fig. 6 is a partial enlarged view of the region L3 in fig. 1.

Fig. 7 is a schematic structural diagram of a water spray pipe in the cooling system of the biaxially oriented film according to the present invention.

Description of the main element symbols: 11-bearing seat, 12-roller body, 13-driving mechanism, 14-spraying mechanism, 15-first water supply mechanism, 16-first water discharge mechanism, 141-main pipe, 142-branch pipe, 143-nozzle, 1411-water inlet section, 1412-water outlet section, 1421-connecting section, 1422-spraying section, 121-roller, 122-first spindle head, 123-second spindle head, 124-side plate, 1221-first spindle head, 1231-second spindle head, 125-ribbed plate, 126-water permeable hole, 151-water inlet pipe, 152-water diversion port, 153-first flange, 154-first bearing, 155-oil seal, 161-water outlet pipe, 162-water suction pipe, 163-second flange, 111-support column, 112-bearing seat, 113-third bearing, 171-a second bearing, 172-a bearing hole, 173-a fulcrum shaft, 131-a driving motor, 132-a motor bracket, 21-a water tank, 22-a cooling water spraying device, 23-a press roller device, 24-an air knife water removing device, 30-a die head, 221-a distribution pipe, 222-a water spraying pipe, 223-a water spraying hole, 224-a flow regulating valve, 27-a film blowing device, 271-a first air knife, 272-an air knife support, 273-a slide rail, 274-a locking screw, 231-a first air cylinder bracket, 232-a first driving air cylinder, 233-a first mounting block, 234-a press roller, 235-a swinging plate, 241-a second air knife, 242-a baffle, 296-a second air cylinder bracket, 297-a second driving air cylinder, 298-a second mounting block, 29-guide roller assembly, 291-first guide roller, 292-second guide roller, 293-first support sheet, 294-second support sheet, 295-spring, 28-second drainage mechanism, 281-first drainage pipe, 282-industrial cooling water unit, 283-second drainage pipe and 284-valve.

Detailed Description

The present invention provides a cooling system for biaxially oriented films, which will be described in further detail below with reference to the accompanying drawings and examples in order to make the objects, technical solutions and effects of the present invention clearer and clearer. 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 direction of rotation of the roller body 12 is indicated by the solid arrows in fig. 1, the direction indicated by the solid arrows is downstream, and the direction opposite thereto is upstream, and the direction of drawing the film is indicated by the hollow arrows in fig. 1, and the directions indicated by the hollow arrows are "rear", "front" and "rear" opposite to each other.

Referring to fig. 1-7, the present invention provides a cooling system for biaxially oriented films, which includes a water tank 21 having an upper opening, a roller 12 rotatably disposed in the water tank 21, a driving mechanism 13 for driving the roller 12 to rotate, a spraying mechanism 14 disposed in an inner cavity of the roller 12, a first water supply mechanism 15 for supplying cooling water to the spraying mechanism 14, and a first water drainage mechanism 16 for draining away water accumulated in the inner cavity of the roller 12; the spraying mechanism 14 is used for spraying cold water to the inner wall of the roller body 12 to reduce the temperature; the water tank 21 is provided with a cooling water spray device 22 located on the outer periphery of the roll body 12, and the cooling water spray device 22 sprays cooling water toward the thin film 5. The upper portion of the roller body 12 is exposed out of the water tank 21, that is, a part of the roll surface of the roller body 12 can be immersed in the water tank 21. In order to save water resources, the water of the cooling system is recycled, the cooling water is stored in a water storage tank and then is sent to different equipment through a water supply mechanism, and then the water is discharged through heat exchange with the film 5 and is cooled by an industrial cooling water unit and flows back to the water storage tank for recycling.

When the cooling device works, the driving mechanism 13 drives the roller body 12 to rotate, the first water supply mechanism 15 sends cooling water to the spraying mechanism 14, and the spraying mechanism 14 continuously sprays cold water to the inner wall of the upper part of the roller 121, so that the roller surface passing through the die head 30 and the roller surface facing the die head are subjected to effective heat exchange, the temperature of the roller surface of the part is ensured to be enough to cool the plastic extruded from the die head, the plastic is rapidly cooled to form the film 5, and then the film 5 is attached to the surface of the roller body 12 for further cooling; and the sprayed cold water can flow back to the bottom of the roller 121, so that a certain amount of accumulated water exists at the bottom of the roller 121, the roller surface in contact with the accumulated water can also exchange heat with the accumulated water, and the roller surface of the roller is cooled, so that the cooling water is utilized more fully and reasonably, the overall temperature of the roller body 12 is reduced, and the cooling effect of the film is improved. Meanwhile, the film 5 enters the water tank 1 along with the rotation of the roller body 12, the roll-close surface of the film 5 is attached to the roller body 12 to realize cooling, and the non-roll-close surface of the film is immersed in the cooling water to realize heat transfer; in addition, the cooling water spraying device 22 also sprays cooling water to the non-roll-sticking surface of the film 5, so that on one hand, the water around the film can form turbulent flow, the film 5 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 22 forms a certain water pressure, so that the film 5 can still be tightly attached to the roller body 12 in water, the cooling effect of the roller surface of the film is improved, and the thicker unstretched film is timely and fully cooled under the combined action of the cooling water and the roller body.

Compared with the existing film cooling mode, the cooling system of the biaxial stretching film provided by the invention has the following advantages:

1. the heat exchange mode that the spraying mechanism 14 sprays the roller surface in the roller body is adopted, the roller surfaces at different positions of the roller 121 are sprayed by cold water with the same temperature, the temperature difference of all parts on the roller is reduced, the heat exchange effect is good, a film is better cooled, the heat exchange mode is essentially different from the heat exchange mode of a spiral flow channel, and the problem that the temperature difference of two ends of the roller is larger is fundamentally solved; 2. the sprayed cold water flows back to the bottom of the roller body to form a certain amount of accumulated water, so that the roller surface at the bottom of the roller body is cooled, the roller can more fully cool the film, cooling water resources are fully utilized, and the overall temperature of the roller body 2 is reduced; 3. the circumference of the roller body is long enough, the casting path of the film is increased, and the cooling is more timely and sufficient; 4. after the film is cooled and formed, the casting enters a water tank to realize further cooling, and the non-roller-sticking surface of the film is immersed in cooling water to realize heat transfer, so that the middle part and the non-roller-sticking surface of the film are effectively cooled; 5. 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.

Specifically, referring to fig. 2 and fig. 3, the spraying mechanism 14 includes a plurality of main pipes 141, and a plurality of branch pipes 142 connected to the main pipes 141; the upper side of each branch pipe 142 is provided with a plurality of nozzles 143 in the axial direction. In practical use, the main pipe 141 is a Y-pipe, the Y-pipe comprises a water inlet section 1411 and two water outlet sections 1412, the water inlet section 1411 of the Y-pipe is in flange connection with the water inlet pipe 151, and the water outlet section 1412 of the Y-pipe is in flange connection with the branch pipe 142. Set up like this for the interior roll surface of roller 121 rotates the in-process and passes through a plurality of branch pipes 142 one by one, thereby makes the roll surface can heat exchange many times and cool down, reduces roll body 12 temperature, guarantees the film cooling effect. In this embodiment, there are two main pipes 141, and the two main pipes 141 are symmetrically arranged, that is, there are 4 branch pipes 142, and each branch pipe 142 is responsible for spraying a part of the inner roll surface, so that the spray nozzles 143 on the branch pipes 142 uniformly spray and cool the upper part of the roll cylinder 121.

Further, referring to fig. 2 and 3, each of the branch pipes 142 includes a connecting section 1421 and a spraying section 1422, the spraying section 1422 extends along the central axis direction of the roller body 12, since the edge portion of the plastic in the molten state is necked after coming out of the mold, the edge portion is thicker, and if the edge portion is not cooled sufficiently, edge warping is easily caused, so that the roller attaching effect of the film 5 is not good, and the cooling is not uniform, the nozzles 143 are gradually and densely arranged along the center of the spraying section 1422 towards the two ends thereof, it can be understood that the two end portions of the spraying section 1422 correspond to the two end portions of the roller body 12, so that the number of the nozzles 143 is more and dense, and the edge portion of the film 5 can be sufficiently cooled; and the nozzles 143 arranged in the middle of the spray section 1422 are sparse to ensure sufficient water pressure.

Specifically, referring to fig. 2, the roller body 12 includes a shaft head and a roller 121, the shaft head includes a first shaft head 122 and a second shaft head 123, the first shaft head 122 includes a side plate 124 and a first shaft center 1221, and the second shaft head 123 includes a side plate 124 and a second shaft center 1231; the first shaft head 122 and the second shaft head 123 are installed at both ends of the roller 121; the first axis 1221 is in transmission connection with the driving mechanism 13; the second shaft center 1231 is arranged in a hollow manner, and the first water supply mechanism and the first water discharge mechanism enter the roller 121 through the second shaft center 1231; the water tank 21 is provided with a bearing seat 11 on the outside, and the first shaft head 122 and the second shaft head 123 penetrate through the inner wall of the water tank 21 and are connected with the bearing seat 11. In this embodiment, the wall thickness of the roller 121 is set to be 8-17 mm, so that the roller 121 can exchange heat rapidly and the film cooling is accelerated.

Further, referring to fig. 2, the first shaft 1221 and the second shaft 1231 are connected to the corresponding side plate 124 by welding, in order to improve the connection strength between the side plate 124 and the shaft, the first shaft 122 and the second shaft 123 further include a rib 125, the rib 125 is welded to the side plate 124 and the shaft, the rib 125 is disposed in the roller 12, the rib 125 is provided with a plurality of water permeable holes 126, and the movement resistance of the accumulated water to the rib 125 can be reduced by disposing the water permeable holes 126.

Preferably, referring to fig. 2 and 4, the first water supply mechanism 15 includes a water inlet pipe 151 capable of penetrating through the second axis 1231 and extending into the roller body 12, an outer diameter of the water inlet pipe 151 is smaller than an inner diameter of the second axis 1231, a water diversion port 152 is disposed at one end of the water inlet pipe 151, and the spraying mechanism 14 is communicated with the water inlet pipe 151 through the water diversion port 152; a first flange 153 is arranged at the other end of the water inlet pipe 151, and the water inlet pipe 151 is connected with a high-pressure water pump through the first flange 153; the high pressure water pump sends the water in the water storage tank to the spraying mechanism 14.

Further, referring to fig. 4, a plurality of first bearings 154 are disposed between the water inlet pipe 151 and the second axis 1231, the first bearings 154 are sleeved on the outer wall of the water inlet pipe 151, and the second axis 1231 can rotate relative to the water inlet pipe 151. The first bearing 154 is a self-lubricating bearing which can be lubricated without oil or with less oil, and an oil seal 155 is arranged between the second shaft center 1231 and the water inlet pipe 151.

Specifically, referring to fig. 2 and 4, the first drainage mechanism 16 includes a water outlet pipe 161, and a water suction pipe 162 disposed at one end of the water outlet pipe 161; the water inlet pipe 151 is hermetically sealed outside the water outlet pipe 161; the suction pipe 162 extends downward such that its suction opening 165 is near the bottom of the drum 121. The water outlet end of the water outlet pipe 161 is provided with a second flange 163, the water outlet pipe 161 is connected with a water suction pump through the second flange 163, and the water suction pump generates negative pressure to enable the water suction pipe 162 to suck accumulated water in the roller body 12 out and convey the accumulated water to an industrial water chilling unit for cooling, and then the accumulated water flows back to the water storage pool.

Preferably, referring to fig. 2, the bearing seat 11 includes two sets of symmetrically disposed pillars 111, and a bearing seat 112 disposed on the tops of the pillars 111; the first shaft center 1221 and the second shaft center 1231 are connected with the corresponding bearing seats 112 through third bearings 113; in order to reduce the bearing load of the roller body 12 on the water inlet pipe 151 and the water outlet pipe 161, a support is arranged on the pillar 111 close to the second axis 1231, and supports one end parts of the water inlet pipe 151 and the water outlet pipe 161; in addition, in order to effectively support one end portions of the water inlet pipe 151 and the water outlet pipe 161, and to maintain good stability of the spraying mechanism 14, the water inlet pipe 151, and the water outlet pipe 161 during operation, a bearing hole 172 is formed on an end surface of the water outlet pipe 161 close to the first axis 1221, a supporting shaft 173 is fixedly arranged on an end surface of the first axis 1221 facing the water outlet pipe 161, and the supporting shaft 173 is rotatably connected with the bearing hole 172 through a second bearing 171, so that the first axis 1221 can rotate relative to the water outlet pipe 161.

Preferably, referring to fig. 2, the driving mechanism 13 includes a motor bracket 132 disposed on the pillar 111 and a driving motor 131 disposed on the motor bracket 132, and the driving motor 131 is in transmission connection with the first axis 1221. The bottom of the pillar 111 is fixed to the ground, the driving motor 131 drives the roller 12 to rotate smoothly through the first axis 1221, and the driving motor 131 is preferably a servo motor.

Specifically, referring to fig. 1, the cooling water spraying device 22 includes a distribution pipe 221 and a plurality of water spraying pipes 222; each water spraying pipe 222 is connected with the distribution pipe 221 through a connection pipe; the water spraying pipe 222 extends along the axial direction of the roller body 12, a plurality of water spraying holes 223 are uniformly arranged on the water spraying pipe 222 along the axial direction, and each water spraying hole 223 faces the film; the distribution pipe 221 is connected to a high pressure water pump which draws the cooling water from the reservoir and then feeds the cooling water to the individual spray pipes 222. Each connecting pipe is provided with a flow regulating valve 224, and the total flow of water sprayed from the water spraying holes 223 by the corresponding water spraying pipe 222 can be regulated by regulating the flow regulating valve 224, so that the impact force can be regulated. In addition, the plurality of water spray pipes 222 are uniformly arranged at equal angles with the axis of the roller body 12, the arrangement is reasonable, and the film cooling is sufficient.

In this embodiment, referring to fig. 1, three sets of water spraying pipes 222 are correspondingly arranged in the cooling water spraying device 22 according to the winding area of the film, the water spraying holes 223 of the first set of water spraying pipes 227 face the front end of the roller body 12, and the water spraying holes 223 of the second set of water spraying pipes 228 face the rear end of the roller body 12; the third set of jets 229 is directed towards the film exiting the roll body 12. Under the jetting effect of the three groups of water spraying pipes, 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, please refer to fig. 1 and 5, the cooling system further includes a film blowing device 27 disposed at the top of the water tank 21, the film blowing device 27 includes a first air knife 271 located at the lower side of the die head 30, the first air knife 271 blows out an air curtain, and the film just formed is attached to the roll surface of the roll body 12 in time by using air pressure, so as to achieve the purpose of reducing or eliminating the gap between the film and the roll body 12, thereby improving the cooling effect of the roll body 12 on the film, and on the other hand, the water in the water tank 21 can be reduced from permeating into the film and the roll body 12 to affect the heat exchange effect of the film and the roll body 12.

Preferably, referring to fig. 5, the film blowing device 27 further includes an air knife support 272 and two sliding rails 273 extending along the direction of the water tank 21, and the air knife support 272 is slidably connected to the sliding rails 273 through a sliding block; the first air knife 271 is arranged on the air knife support 272; the air knife support 272 is provided with a locking screw 274 for fixing the position of the air knife support 272. When the position of the first air knife 271 needs to be adjusted, the locking screw 274 is loosened to push the air knife support 272, the distance between the first air knife 271 and the roller body 12 is adjusted, and then the locking screw 274 is tightened to complete the adjustment.

Preferably, the cooling system further includes an air knife water removing device 24, the air knife water removing device 24 includes a second air knife 241 and a baffle 242 disposed on the upper side of the second air knife 241, and the air outlet of the second air knife 241 is inclined toward the roller body 12 and toward the upstream direction of the roller body. The second air knife 241 blows off the moisture attached to the roller body 12 completely, ensures that the roller surface of the roller body 12 is dried thoroughly after passing through the air knife water removal device 24, ensures that the roller surface of the roller body 12 is smooth and tidy, and avoids influencing the film casting effect, and in addition, the baffle 242 prevents water from splashing on the roller surface located at the downstream of the air knife water removal device 24 when blowing off.

In order to improve the drying effect of the roller surface, a compression roller device 23 is arranged upstream of the air knife water removal device 24, as shown in fig. 6, the compression roller device 23 comprises a swing plate 235, a first air cylinder bracket 231 arranged on the swing plate 235, a first driving air cylinder 232 arranged on the first air cylinder bracket 231, a first mounting block 233 arranged on the output end of the first driving air cylinder 232, and a compression roller 234 arranged on the first mounting block 233; the first driving cylinder 232 is used for driving the pressing roller 234 on the first mounting block 233 to press on the roller body 12; during operation, the first driving cylinder 232 drives the pressing roller 234 on the first mounting block 233 to press against the roller body 12, the pressing roller 234 presses and removes water drops attached to the roller body 12, and the water drops can be converged to form water flow to slide along the roller surface after being changed into water, so that the roller surface of the pressing roller 234 is subjected to primary drying. Preferably, two press rollers 234 are provided to further ensure the drying effect.

Preferably, the swing plate 235 can swing around the axial center of the roller body 12, and the axis of the first driving cylinder 232 intersects with the axis of the roller body 12. The circumferential position of the roller unit 23 with respect to the axial center of the roller body 12 can be adjusted by rotating the swing plate 235.

Preferably, a guide roller assembly 29 is arranged upstream of the press roller device 23, and the guide roller assembly 29 comprises a second cylinder support 296, a second driving cylinder 297 arranged on the second cylinder support 296, a second mounting block 298 arranged on the output end of the second driving cylinder 297, and a first guide roller 291 arranged on the second mounting block 298; the first guide roller 291 is used for changing the conveying direction of the film; the second driving cylinder 297 is used for adjusting the tension of the first guide roller 291 on the second mounting block 298 on the film; a second cylinder bracket 296 is arranged on the swing plate 235, the axis of the second driving cylinder 297 is intersected with the axis of the roller body 12, the second mounting block 298 is provided with a swing arm 299 which is in pivot connection, and the free end of the swing arm 299 is provided with a second guide roller 292; the swing plate 235 is provided with a first support 293, the swing arm 299 is provided with a second support 294, and a spring 295 is arranged between the first support 293 and the second support 294. The film sequentially passes through the second guide roller 292 and the first guide roller 291, the swing arm is pulled by the spring 295, the second guide roller 292 is pressed on the film, a film pressing line is formed between the second guide roller 292 and the film, the film is guided and pulled by the first guide roller 291 after passing through the film pressing line, so that the film is separated from the roller body 12, and then the film is pulled by the third guide roller 290 to enter the water tank 21 again for cooling.

Preferably, the cooling system further includes a second drainage mechanism 28, and the second drainage mechanism 28 includes a first drainage pipe 281, an industrial cooling water unit 282, and a second drainage pipe 283; the water tank 21 is connected with a water inlet end of the industrial cooling water unit 282 through a first water discharge pipe 281, the second water discharge pipe 283 is connected with a water outlet end of the industrial cooling water unit 282, a valve 284 is arranged on the first water discharge pipe 281, the valve 284 controls the amount of water entering the industrial cooling water unit 282, the water in the water tank 21 is cooled by the industrial cooling water unit 282 and then flows back to the water storage tank through the second water discharge pipe 283, then the cooling water in the water storage tank is pumped by a high-pressure water pump and sent to the cooling water injection device 22, and the cooling water injection device 22 cools the film and also can supplement water for the water tank 21. Of course, in order to supply water to the water tank 21, the water tank 21 is connected to the water storage tank through a second water supply mechanism, which includes a water supply pipe 210 and a high pressure water pump, and the water supply pipe supplies water from the water storage tank to the water tank 21 through the high pressure water pump. It should be noted that the industrial cooling water unit 282 is commercially available and will not be described herein.

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 (10)

1. A cooling system of a biaxial stretching film is characterized by comprising a water tank with an upper opening, a roller body which is rotatably arranged in the water tank, a driving mechanism for driving the roller body to rotate, a spraying mechanism arranged in the inner cavity of the roller body, a first water supply mechanism for supplying cooling water to the spraying mechanism, and a first drainage mechanism for draining accumulated water in the inner cavity of the roller body; the spraying mechanism is used for spraying cold water to the inner wall of the roller body to reduce the temperature; and a cooling water spraying device positioned on the periphery of the roller body is arranged in the water tank and used for spraying cooling water to the film.

2. The system for cooling biaxially oriented film of claim 1, wherein the spraying mechanism comprises a plurality of main pipes, a plurality of branch pipes connected to the main pipes; a plurality of nozzles are axially arranged on the upper side of each branch pipe; each branch pipe comprises a connecting section and a spraying section, the spraying section extends along the direction of a central shaft of the roller body, and the nozzles are gradually and densely distributed along the center of the spraying section towards the directions of the two ends of the spraying section.

3. The system of claim 1, wherein the roll body comprises a mandrel head and a roll drum, the mandrel head comprising a first mandrel head comprising a side plate and a first axial center and a second mandrel head comprising a side plate and a second axial center; the first shaft head and the second shaft head are arranged at two ends of the roller; the first axis is in transmission connection with the driving mechanism; the second shaft is arranged in a hollow manner, and the first water supply mechanism and the first water discharge mechanism enter the roller through the second shaft; the water tank is characterized in that a bearing seat is arranged outside the water tank, and the first shaft head and the second shaft head penetrate through the inner wall of the water tank and are connected with the bearing seat.

4. The cooling system for the biaxially oriented film according to claim 3, wherein the first water supply mechanism comprises a water inlet pipe which can penetrate through the second shaft center and extend into the roller body, the outer diameter of the water inlet pipe is smaller than the inner diameter of the second shaft center, a water diversion port is formed in one end of the water inlet pipe, and the spraying mechanism is communicated with the water inlet pipe through the water diversion port; be provided with the first bearing of a plurality of between inlet tube and the second axle center, first bearing cover is established on the outer wall of inlet tube, and the second axle center can rotate relative to the inlet tube.

5. The system for cooling biaxially oriented film of claim 4, wherein the first drainage mechanism comprises a water outlet pipe, a water suction pipe disposed at one end of the water outlet pipe; the water inlet pipe is sleeved outside the water outlet pipe in a sealing manner; the water suction pipe extends downwards, so that a water suction port of the water suction pipe is close to the bottom of the roller.

6. The system for cooling biaxially oriented film of claim 1, wherein the cooling water spraying means 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 spraying pipe extends along the axial direction of the roller body, a plurality of water spraying holes are uniformly arranged on the water spraying pipe along the axial direction, and each water spraying hole faces the film; the distribution pipe is connected with a high-pressure water pump.

7. The system for cooling biaxially oriented film of claim 1, further comprising a film blowing device comprising a first air knife located on the underside of the die head, said first air knife being adapted to blow an air curtain to hold the film against the roll surface of the roll body.

8. The cooling system of a biaxially oriented film according to claim 1, further comprising an air knife water removal device, wherein the air knife water removal device comprises a second air knife and a baffle plate arranged on the upper side of the second air knife, and the air outlet of the second air knife is inclined toward the roller body and toward the upstream direction of the roller body.

9. The cooling system of the biaxial stretching film as claimed in claim 8, wherein a compression roller device is arranged upstream of the air knife water removing device, the compression roller device comprises a swing plate, a first cylinder bracket arranged on the swing plate, a first driving cylinder arranged on the first cylinder bracket, a first mounting block arranged on the output end of the first driving 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 roller body.

10. The system for cooling biaxially oriented film of claim 9, wherein a guide roller assembly is disposed upstream of the roller assembly, the guide roller assembly comprises a second cylinder frame, a second driving cylinder disposed on the second cylinder frame, a second mounting block disposed on the output end of the second driving cylinder, and a first guide roller disposed 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 roller body, 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.

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