CN209937692U

CN209937692U - Down-blowing water-cooling film blowing device

Info

Publication number: CN209937692U
Application number: CN201920588717.0U
Authority: CN
Inventors: 张有忱; 宋立健; 石美浓; 谭晶; 焦志伟; 丁玉梅; 杨卫民; 郎增科; 李思奇
Original assignee: BAODING BANGTAI POLYMERIC NEW-MATERIALS Co Ltd; Beijing University of Chemical Technology
Current assignee: BAODING BANGTAI POLYMERIC NEW-MATERIALS Co Ltd; Beijing University of Chemical Technology
Priority date: 2019-04-27
Filing date: 2019-04-27
Publication date: 2020-01-14
Anticipated expiration: 2029-04-27

Abstract

The utility model discloses a blow water-cooling blown film device down mainly includes plastify mechanism, blown film mechanism, frame, cooling body, cutting mechanism, drive mechanism and winding mechanism. The plasticizing mechanism, the cutting mechanism and the winding mechanism are positioned on the ground, the film blowing mechanism is positioned on the rack, and the cooling mechanism and the traction mechanism are positioned in a water tank below the ground. The material is melted and plasticized by the plasticizing mechanism to enter the film blowing mechanism on the left side, and the film blowing mechanism blows the material to be thin and formed into a film and enters the cooling mechanism below for cooling. The cutting mechanism cuts the film as it enters the cooling mechanism. The cooled film is guided by a traction mechanism and finally wound by a winding mechanism. The utility model relates to a down-blowing water-cooling blown film device is applicable to the production of the super wide film of big book footpath. The water in the water tank in the device can be kept in a constant temperature state through the circulation of the water pump. The dead weight break of the film is greatly improved as the film tube is drawn downward. The performance of the shaped film is greatly improved compared with the performance of the film produced by the traditional process.

Description

Down-blowing water-cooling film blowing device

Technical Field

The utility model relates to a blown film shaping field for blow down water-cooling production PVC film.

Background

Blown film is one of the most widely used forming methods in the production of plastic films. The blown film is blown by an upward blowing method in the production, and the actual production has the following problems that (1) the temperature of a workshop is high in summer, the traction direction is the same as the heat flow direction, and the cooling effect is poor. (2) The dead weight of the membrane tube is easily broken due to the frame being too high. (3) After the membrane tube passes through the herringbone plate, the membrane is not strong enough, and the fracture phenomenon can also occur. In order to solve the above problems, a down-blown water-cooled blown film has been proposed. The film self-weight fracture phenomenon caused by upward blow molding is avoided, and the cooling effect is greatly improved compared with an upward blowing method. The cooling system of the traditional down-blowing water cooling method mostly adopts a water ring spraying method or a film tube inner-device method. Through search, the Chinese patent discloses a cooling water ring of a down-blowing type film blowing (application number CN 201610447228.4), which has the advantages that the cooling water is uniformly distributed on film bubbles, the cooling effect is improved, and the film quality is improved. A film blowing machine membrane intraductal circulation water-cooling device (application number CN 201210345991.8) its advantage lies in simple structure, and the refrigeration is fast.

Along with the actual production requirements of people, ultra-wide and large-diameter films are provided. Because the characteristics of the film of super broad width large diameter: the bubble diameter is large and the height is long (the required height of the film with 24m of folded diameter is more than 10 m), and efficient heat dissipation is the first factor to be considered. For the production of films with large folding diameter, the traditional downward blowing water cooling device has the following defects: (1) in the production of the large-folding-diameter film, the distance from the film bubble to the water ring is longer, and in addition, the air flow in a workshop causes cooling water sprayed by the water ring not to be uniformly distributed, so that the quality of the film bubble is greatly reduced; (2) the traditional downward blowing water cooling is mainly focused on the structure optimization of a water ring, a die head and an intramembrane device. The introduction of equipment such as a compressor, a pump and the like leads the device to be more and more complex, and if a traditional production mode is adopted in the production of the large-diameter film, the volume requirement of the mobile equipment is high, and the cost is correspondingly increased; (3) for the film with large folding diameter, the height of the film tube is large, the height of the needed plant is large, and the cost is high; (4) for the traditional downward blowing water cooling device in spring and summer, the membrane tubes are exposed in the air, and the temperature difference of the membrane tubes is large in two seasons, so that the production process is greatly influenced.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a purpose is mainly in the production to the big book footpath film of super broad width, provides a novel blow water cooling down device, solves the problem that above-mentioned background proposed.

The utility model discloses a following technical scheme realizes: a down-blowing water-cooling film blowing device: the film blowing machine mainly comprises a plasticizing mechanism, a film blowing mechanism, a rack, a cooling mechanism, a cutting mechanism, a traction mechanism and a winding mechanism. The plasticizing mechanism, the cutting mechanism and the winding mechanism are positioned on the ground, the film blowing mechanism is positioned on the rack, and the cooling mechanism and the traction mechanism are positioned in a water tank below the ground. The material is melted and plasticized by the plasticizing mechanism to enter the film blowing mechanism on the left side, and the film blowing mechanism blows the material to be thin and formed into a film and enters the cooling mechanism below for cooling. The cutting mechanism cuts the film as it enters the cooling mechanism. The cooled film is guided by a traction mechanism and finally wound by a winding mechanism. The plasticizing mechanism comprises a twin-screw extruder. The extruder melts and plasticizes the materials, and the melted materials are extruded out through the annular mouth die gap of the machine head. And a film blowing mechanism is arranged on one side of the plasticizing mechanism. The film blowing mechanism comprises a machine head, a wind ring and a pressure sensor. The film blowing mechanism blows the extruded film tube to a high elastic state and vertically guides the film tube to the cooling mechanism below. The frame is located the below ground, and its characterized in that frame top flat board is installed the aircraft nose and the wind ring of blown film. The cooling mechanism comprises a constant-temperature water tank and cooling water. The constant-temperature water tank is positioned below the horizontal ground and can control the height of the water level and the temperature of cooling water. And the film blown out by the film blowing mechanism is cooled by a constant-temperature water tank. The cutting mechanism comprises a hydraulic device, a cutting knife and a knife groove, and is characterized in that the hydraulic device pushes a transmission element to move back and forth through a hydraulic cylinder execution element, the transmission element drives the knife groove to rotate, and the cutting knife can move in the knife groove. Because the water pressure grow gradually in the basin at the membrane tube through the basin in-process, the membrane tube in the basin can be flattened because of inboard gaseous and outside hydraulic pressure difference, drives the cutting knife motion through hydraulic means this moment, and the film in the cutting knife cutting basin, the pressure of cooling water is greater than the atmospheric pressure in the membrane tube to make the cooling water get into the membrane tube, guaranteed the internal and external pressure balance of membrane tube. The film traction mechanism comprises a winding roller and a traction roller, and the winding roller and the traction roller are fixed inside the constant-temperature water tank. The winding roller flattens the cylindrical film tube, and the formed film is wound by the traction roller and is drawn to a winding mechanism above the ground. The winding mechanism is positioned on the left side of the ground. The blown film tube is rolled up by a traction device, is drawn to the ground and is automatically rolled up by a rolling device.

The utility model relates to a blow down water-cooling blown film device's work flow: and (3) placing the material into a feed inlet of an extruder, melting and plasticizing the material, and extruding and molding under the action of a head die. The film blowing mechanism blows the extruded material into a film tube, and the film tube vertically downwards reaches a balanced state under the action of gravity and compressed air in the machine head. The membrane pipe gets into the constant temperature basin and is cooled by the cooling water, because the inside and outside differential pressure of membrane pipe is uneven, and the membrane pipe in the basin can inwards be sunken, and hydraulic means drives the membrane pipe of cutter cutting surface of water below this moment, and the water in the membrane pipe outside can get into in the membrane pipe, keeps inside and outside pressure balance, and sunken membrane pipe resumes initial state. The film tube is extruded into a film by a winding roller, and is wound by a winding device which is wound by a traction roller and is drawn to the ground.

A water-cooling spray device can be additionally arranged near the machine head.

The utility model relates to a blow down water-cooling blown film device can add appropriate amount ethylene glycol in the aquatic in winter, and the temperature can be lower, and can prevent frostbite. In addition, a cooling pipe (with a compressor) and a heating pipe may be provided outside the water tank for controlling the temperature of the cooling water.

The utility model relates to a down-blowing water-cooling blown film device is applicable to the production of the super wide film of big book footpath. The water tank has the beneficial effects that (1) the water in the water tank can be kept in a constant temperature state through the circulation of the water pump. After the film pipe extruded by the extruder is cooled by cooling water of a water tank, the surface temperature of the film can be constantly kept at a lower temperature. (2) The dead weight break of the film is greatly improved as the film tube is drawn downward. The performance of the shaped film is greatly improved compared with the performance of the film produced by the traditional process. (3) The film blowing device is positioned below the ground, the construction cost of a factory building can be greatly reduced, and (4) the temperature difference of the film tube in four seasons is small, so that the influence on the production process is small.

Drawings

Fig. 1 is a schematic view of the down-blowing water-cooling film blowing device of the present invention.

Fig. 2 is a schematic diagram of the hydraulic device and the cutting device of the down-blowing water-cooling film blowing device of the present invention.

Fig. 3 is a schematic diagram of the film state before and after cutting in the water tank of the bottom blowing water-cooling film blowing device of the present invention.

In the figure: 1-extruder, 2-head, 3-frame, 4-wind ring, 5-coiling device, 6-film, 7-drawing roller, 8-constant temperature water tank, 9-coiling roller, 10-cutting knife, 11-knife slot, 12-hydraulic device, 13-transmission element.

Detailed Description

The utility model discloses a blow down water-cooling blown film device, as shown in figure 1: the film blowing machine mainly comprises a plasticizing mechanism, a film blowing mechanism, a rack, a cooling mechanism, a cutting mechanism, a traction mechanism and a winding mechanism. The plasticizing mechanism, the cutting mechanism and the winding mechanism are positioned on the ground, the film blowing mechanism is positioned on the rack, and the cooling mechanism and the traction mechanism are positioned in a water tank below the ground. The material is melted and plasticized by the plasticizing mechanism to enter the film blowing mechanism on the left side, and the film blowing mechanism blows the material to be thin and formed into a film and enters the cooling mechanism below for cooling. The cutting mechanism cuts the film as it enters the cooling mechanism. The cooled film is guided by a traction mechanism and finally wound by a winding mechanism. The plasticizing mechanism comprises a twin-screw extruder 1. The extruder 1 melts and plasticizes the materials, and the melted materials are extruded out through the annular neck ring gap of the machine head 2. And a film blowing mechanism is arranged on one side of the plasticizing mechanism. The film blowing mechanism comprises a machine head 2, a wind ring 4 and a pressure sensor. The film blowing mechanism blows the extruded film tube to a high elastic state and vertically guides the film tube to the cooling mechanism below. The frame 3 is positioned below the ground and is characterized in that a flat plate above the frame 3 is provided with a film blowing machine head 2 and an air ring 4. The cooling mechanism comprises a constant-temperature water tank 8 and cooling water. The constant-temperature water tank is characterized in that the constant-temperature water tank 8 is positioned below the horizontal ground and can control the height of the water level and the temperature of cooling water. The film 6 blown out by the film blowing mechanism is cooled by a constant temperature water tank 8. As shown in fig. 3(1), the film in the cooling water is sunken due to the unbalanced internal and external pressures, and the film tube 6 in the water tank 8 is flattened due to the gradually increased water pressure in the water tank 8 when the film tube 6 passes through the water tank 8, as shown in fig. 3(2), the cutting knife 10 is driven by the hydraulic device 12 to move, the cutting knife 10 cuts the film 6 in the water tank 8, and the pressure of the cooling water is greater than the air pressure in the film tube 6, so that the cooling water enters the film tube 6, and the internal and external pressures of the film tube 6 are balanced. As shown in fig. 2, the cutting mechanism comprises a cutting knife 10, a knife slot 11 and a hydraulic device 12, and is characterized in that the hydraulic device 12 pushes a transmission element 13 to move back and forth through a hydraulic cylinder actuator, the transmission element 13 drives the knife slot 11 to rotate, and the cutting knife 10 can move in the knife slot 11. The traction mechanism comprises a traction roller 7 and a winding roller 9, and the traction roller 7 and the winding roller 9 are fixed inside a constant-temperature water tank 8. The winding roller 9 flattens the cylindrical film tube 6, and the formed film 6 is wound by the traction roller 7 and is drawn to the winding device 5 above the ground. The winding device 5 is positioned on the left side of the ground. The blown film tube 6 is rolled up and drawn to the ground by the traction device 5 and then automatically rolled up by the rolling device 5.

When the device works, materials are firstly placed in a feeding hole of the extruder 1, and the materials are subjected to melting plasticization and extrusion molding under the action of the nose neck mold 2. The film blowing mechanism blows the extruded material into a film tube 6, and the film tube 6 vertically downwards reaches a balanced state under the action of gravity and compressed air in the machine head 2. As shown in fig. 3, the membrane tube enters the constant temperature water tank 8 and is cooled by the cooling water, because the pressure difference inside and outside the membrane tube 6 is unbalanced, the membrane tube 6 in the water tank 8 can be sunken inwards, at the moment, the hydraulic device 12 drives the cutter 10 to cut the membrane tube 6 below the water surface, the water outside the membrane tube 6 can enter the membrane tube 6, the pressure inside and outside is balanced, and the sunken membrane tube 6 is restored to the initial state. The film tube 6 is extruded into a film through a winding roller 8, and is wound by a winding device 5 which is wound by a traction roller 7 and is drawn to the ground.

Claims

1. The utility model provides a blow down water-cooling blown film device, mainly includes plasticizing mechanism, blown film mechanism, frame, cooling body, cutting mechanism, drive mechanism and winding mechanism, its characterized in that: the plasticizing mechanism, the cutting mechanism and the winding mechanism are positioned on the ground, the film blowing mechanism is positioned on the rack, and the cooling mechanism and the traction mechanism are positioned in a water tank below the ground; the material is melted and plasticized by the plasticizing mechanism and enters the film blowing mechanism on the left side, the film blowing mechanism blows the material to be thin and formed into a film, and the film is cooled by the cooling mechanism below the film blowing mechanism; the cutting mechanism cuts the film when the film enters the cooling mechanism; the cooled film is guided by a traction mechanism and is finally wound by a winding mechanism; the film blowing mechanism comprises a machine head, a wind ring and a pressure sensor, and is used for blowing the extruded film tube to a high elastic state and vertically guiding the film tube to a cooling mechanism below; the machine frame is positioned below the ground, a machine head for blowing the film and an air ring are installed on a flat plate above the machine frame, the cooling mechanism comprises a constant-temperature water tank and cooling water, and the constant-temperature water tank is positioned below the horizontal ground and can control the height of the water level and the temperature of the cooling water; the film traction mechanism comprises a winding roller and a traction roller, and the winding roller and the traction roller are fixed in the constant-temperature water tank; the winding mechanism is positioned on the left side of the ground, and the blown film tube is wound and drawn to the ground by the traction device and then automatically wound by the winding device.

2. The down-blowing water-cooling film blowing device according to claim 1, characterized in that: the cutting mechanism comprises a hydraulic device, a cutting knife and a knife groove, the hydraulic device pushes the transmission element to move back and forth through the hydraulic cylinder execution element, the transmission element drives the knife groove to rotate, and the cutting knife can move in the knife groove.

3. The down-blowing water-cooling film blowing device according to claim 1, characterized in that: adding a proper amount of glycol into water, or arranging a cooling pipe and a heating pipe outside the water tank for controlling the temperature of cooling water.