Technical Field
The utility model discloses an air knife type high-efficiency cooling device for corrugated plastic sheets, belonging to the field of plastic machinery. It is mainly used for cooling corrugated plastic sheets after shaping and tempering during production.
Background Art
At present, ordinary electric fans are adopted to blow air directly for cooling sheets after shaping and tempering in the production of corrugated plastic sheets. Due to the large contact area and substantial wind energy loss, the cooling effect is unsatisfactory.In view of the current development of corrugated plastic sheet manufacturing machinery, there is an urgent demand for an air knife type high-efficiency cooling device featuring high wind speed, small contact area with sheets and excellent cooling performance.
Contents of the Utility Model
The objective of the utility model is to provide an air knife type high-efficiency cooling device for corrugated plastic sheets to overcome the deficiencies of existing corrugated plastic sheet manufacturing equipment. The device realizes small contact area with sheets, concentrated wind energy and superior cooling effect.
The technical solution is described as follows. The device comprises a frame, air knife assemblies and protective housings.
The frame includes a frame body, large guard plates, small guard plates, ventilation plates and supports. The frame body consists of a main frame structure, air knife supports, cross beams and lugs.Two planar rectangular air knife supports are fixed on the inner side of one frame plane of the spatial rectangular main frame structure, where the frame plane is defined by the longest edge and the shortest edge of the main frame. The frame plane of each air knife support is perpendicular to the corresponding frame plane of the main frame.Two cross beams are fixed at the middle between the two longest edges of the opposite frame plane parallel to the frame plane equipped with air knife supports.Two cross beams are respectively fixed at the middle between the two medium-length edges on each of the two frame planes defined by medium-length edges and shortest edges of the main frame, and the four cross beams are offset toward the side away from the air knife supports.Two lugs are fixed on each of the four cross beams mounted between medium-length edges. All eight lugs extend toward the other cross beam located on the same frame plane of the main frame.A large guard plate is mounted on the outer side close to the air knife supports, and a small guard plate is mounted on the outer side at the opposite end of each of the two frame planes fitted with cross beams and lugs. One ventilation plate with multiple ventilation holes is installed on the outer middle part of each frame plane.Supports are arranged at four outer corners of the frame plane equipped with air knife supports, and the whole frame is placed on the ground via the four supports.
Each air knife assembly includes an air knife unit, fans and support pins. Each air knife unit comprises No.Ⅰ air knife plate, No.Ⅱ air knife plate, mounting plate, connecting flanges, blade end plates and flow guide plates.The longer base edge of the isosceles trapezoidal No.Ⅰ air knife plate is bent to form No.Ⅰ air knife blade. The included angle between the plate surface of No.Ⅰ air knife blade and the plate surface of No.Ⅰ air knife plate is an obtuse angle. The long edge of No.Ⅰ air knife blade away from No.Ⅰ air knife plate is continuously bent twice to form No.Ⅰ stiffening and scratch-proof lip. The two bending directions are consistent with the bending direction forming No.Ⅰ air knife blade, and each bending angle equals π/2.The longer base edge of the isosceles trapezoidal No.Ⅱ air knife plate is bent to form No.Ⅱ air knife blade. The included angle between the plate surface of No.Ⅱ air knife blade and the plate surface of No.Ⅱ air knife plate is an obtuse angle. The long edge of No.Ⅱ air knife blade away from No.Ⅱ air knife plate is continuously bent twice to form No.Ⅱ stiffening and scratch-proof lip. The two bending directions are consistent with the bending direction forming No.Ⅱ air knife blade, and each bending angle equals π/2.A plurality of rectangular holes are evenly arranged along the length direction of the strip-shaped mounting plate, and one connecting flange is fitted corresponding to each rectangular hole.The shorter base edges of the isosceles trapezoidal No.Ⅰ air knife plate and No.Ⅱ air knife plate are fixed to two long edge sides of the mounting plate respectively. The quantity of outward-facing connecting flanges on the mounting plate satisfies nfl=njk.No.Ⅰ stiffening and scratch-proof lip and No.Ⅱ stiffening and scratch-proof lip face outward. The plate surface of No.Ⅰ air knife blade is parallel to the plate surface of No.Ⅱ air knife blade. Two ends of No.Ⅰ air knife blade and No.Ⅱ air knife blade are fixedly connected via blade end plates respectively.Two triangular flow guide plates are installed between two waists of the isosceles trapezoid at the same end of No.Ⅰ air knife plate and No.Ⅱ air knife plate. Another (2nfl−2) flow guide plates are installed in the wedge-shaped gap formed between No.Ⅰ air knife plate and No.Ⅱ air knife plate.The two flow guide plates close to both ends of the mounting plate are arranged symmetrically relative to the connecting flanges at both ends of the mounting plate together with the two flow guide plates between the isosceles trapezoidal waists at both ends of the air knife plates. Every two remaining flow guide plates are arranged symmetrically relative to one connecting flange.A quantity of fans satisfying nfj=nfl are installed on the nfl connecting flanges respectively. Two support pins are mounted on the two blade end plates respectively.
Two air knife assemblies are installed on the air knife supports of the frame body via mounting plates. Two support pins at both ends of each air knife assembly are supported on the lugs of the frame body. The No.Ⅰ air knife plates of the air knife units face outward. The plate surfaces of No.Ⅰ air knife blades and No.Ⅱ air knife blades are perpendicular to the ventilation plates of the frame.Another two air knife assemblies are mounted on the lower plane of two cross beams arranged on the frame plane of the main frame away from the air knife supports via mounting plates. No.Ⅰ air knife blades and No.Ⅱ air knife blades face downward. Two support pins at both ends of each air knife assembly are supported on the lugs of the frame body. The No.Ⅰ air knife plates of the air knife units face outward. The plate surfaces of No.Ⅰ air knife blades and No.Ⅱ air knife blades are perpendicular to the ventilation plates of the frame.
Each protective housing includes housing side plates, housing end plates and a housing base plate. Multiple heat dissipation holes are formed on both housing side plates and housing end plates.The shorter base edges of two isosceles trapezoidal housing side plates are fixed to two long edges of the housing base plate respectively, and the plate surface of each housing side plate is perpendicular to the plate surface of the housing base plate.One short edge of each of the two housing end plates is fixed to two short edges of the housing base plate respectively. Two long edges of each housing end plate are fixed between two waists of the isosceles trapezoid of the two housing side plates. The other short edge of each housing end plate is aligned with the longer base edge of the isosceles trapezoid of the corresponding housing side plate.The protective housing is mounted on the frame plane of the main frame away from the air knife supports via the longer base edges of the isosceles trapezoidal housing side plates and the short edges of housing end plates away from the housing base plate, with the housing base plate facing upward.
On the basis of the prior art, the main frame of the frame adopts a spatial rectangular frame structure. Two planar rectangular air knife supports are fixed on the inner side of one frame plane defined by the longest edge and shortest edge of the main frame, and the plane of each air knife support is perpendicular to the corresponding frame plane of the main frame. Two cross beams are fixed at the middle between the two longest edges of the opposite parallel frame plane.Two cross beams are respectively arranged at the middle between two medium-length edges on each of the two frame planes defined by medium-length edges and shortest edges, and the four cross beams deviate toward the side away from the air knife supports. Two lugs are fixed on each cross beam, and all lugs extend toward the paired cross beam on the same frame plane.A large guard plate and a small guard plate are separately installed on the outer sides at two ends of each frame plane fitted with cross beams and lugs, and a ventilation plate with multiple holes is arranged at the outer middle section. Supports are installed at four outer corners of the frame plane equipped with air knife supports for ground placement.
For the air knife unit of each air knife assembly, the longer base edge of the isosceles trapezoidal No.Ⅰ air knife plate is bent to form No.Ⅰ air knife blade with an obtuse included angle between their surfaces. The long edge of the blade is continuously bent twice outward to form No.Ⅰ stiffening and scratch-proof lip, each bending angle being π/2 and bending direction consistent. The structure of No.Ⅱ air knife plate, No.Ⅱ air knife blade and No.Ⅱ stiffening and scratch-proof lip follows the same design.Multiple rectangular holes are evenly distributed on the strip-shaped mounting plate, with one connecting flange matched for each hole. The shorter trapezoidal base edges of the two air knife plates are fixed on both long edges of the mounting plate, with connecting flanges facing outward. The stiffening and scratch-proof lips face outward, the blade surfaces are parallel, and two ends of the blades are connected by blade end plates.Two triangular flow guide plates are installed at one end between two air knife plates, and another (2nfl−2) flow guide plates are arranged inside the wedge-shaped gap. Flow guide plates are symmetrically arranged relative to connecting flanges. Fans are installed on corresponding connecting flanges, and support pins are fitted on blade end plates.
Two air knife assemblies are mounted on the air knife supports, with support pins supported on the frame lugs. The blade surfaces are perpendicular to ventilation plates and No.Ⅰ air knife plates face outward. Another two air knife assemblies are installed on the lower surfaces of the cross beams on the opposite frame plane, with blades facing downward. Their blade surfaces are also perpendicular to ventilation plates and No.Ⅰ air knife plates face outward.
Heat dissipation holes are arranged on the side plates and end plates of the protective housing. Two isosceles trapezoidal side plates are vertically fixed on the long edges of the base plate. End plates are enclosed between side plates and the base plate. The whole protective housing is mounted on the frame plane away from air knife supports with the base plate facing upward.
Working Principle
Start the air knife type high-efficiency cooling device. Corrugated plastic sheets after shaping and tempering are fed from one side into the gap: between No.Ⅰ air knife blades, No.Ⅰ stiffening and scratch-proof lips, No.Ⅱ air knife blades and No.Ⅱ stiffening and scratch-proof lips of the two air knife assemblies mounted on air knife supports, and the corresponding components of the two air knife assemblies installed below the cross beams on the opposite frame plane.
As the corrugated sheet travels forward, airflow blown by 4nfj fans of the four air knife assemblies passes through the wedge-shaped space formed by No.Ⅰ and No.Ⅱ air knife plates, and enters the narrow slit between No.Ⅰ and No.Ⅱ air knife blades. The airflow velocity rises sharply to form air knives, which blow directly onto the upper and lower surfaces of the corrugated sheet. The cooled corrugated sheet is guided out from the other side.
Compared with existing equipment in the industry, the utility model brings the following benefits:Equipped with air knife assemblies, high-speed concentrated airflow forms air knives blowing directly on the upper and lower surfaces of corrugated sheets, achieving concentrated wind energy and excellent cooling performance.No.Ⅰ stiffening and scratch-proof lips and No.Ⅱ stiffening and scratch-proof lips are arranged at the cutting edges of air knife blades. They improve the rigidity of air knife blades and prevent accidental hand injuries, enhancing the reliability and practicability of the whole equipment.
