Preparation method of fireproof polyurethane thermal insulation door

Abstract

The invention belongs to the technical field of thermal insulation door preparation, and discloses a preparation method of a fireproof polyurethane thermal insulation door, which comprises the following steps: S1, uncoiling; s2, cutting off; s3, forming; s4, spraying glue; s5, a door frame embedded part and a door plate embedded part are placed; s6, positioning; s7, foaming; s8, performing curing; s9, cutting and windowing; and S10, edge sealing of the door plate and installation of hardware. The preparation method of the fireproof polyurethane heat preservation door is high in automation degree, high in production efficiency, easy and convenient to operate, low in production cost and high in production quality. The plate production speed is 3-5 m / min, the annual production capacity can reach 250000 square meters, the whole production line can complete all operations only by five to seven workers, the production quality can reach grade B, and the production line is suitable for popularization and application.

Description

Technical Field

[0001] The invention belongs to the technical field of thermal insulation door preparation, and particularly relates to a preparation method of a fireproof polyurethane thermal insulation door. Background Art

[0002] Polyurethane insulated doors are highly efficient insulation devices designed specifically for cold storage. Made from a high-density polyurethane foam core (with a thermal conductivity as low as 0.022 W / m·K) and a composite of galvanized steel or stainless steel panels, they offer excellent thermal insulation (K value ≤ 0.8 W / ㎡·K) and can effectively maintain temperatures ranging from -25°C to -60°C. With a closed-cell ratio exceeding 90%, combined with a multi-layer sealing strip design, they completely block the cold bridge effect and prevent frost. Doors typically reach a thickness of 100-150 mm, making them suitable for frequent opening and closing in logistics cold storage, food processing plants, and other environments. Select models also feature an electric antifreeze device and low-temperature-resistant hardware, ensuring over 15 years of service in extreme environments.

[0003] Currently, polyurethane insulated doors used in cold storage facilities are mostly manufactured manually. Each production step requires strong and experienced workers, especially in the bending and forming of the door frames, positioning, and foaming processes, which are extremely labor-intensive. A single worker can typically only produce a dozen or so insulated doors per day, resulting in very low production efficiency and difficulty in ensuring quality. Summary of the Invention

[0004] In view of this, the object of the present invention is to provide a method for preparing a fireproof polyurethane thermal insulation door. The present invention aims to solve the problem of low production efficiency and difficulty in ensuring production quality of polyurethane thermal insulation doors.

[0005] To achieve the above object, the present invention discloses a method for preparing a fireproof polyurethane thermal insulation door, comprising the following steps:

[0006] The method for preparing the fireproof polyurethane thermal insulation door is equipped with a production line, which is used to produce the polyurethane thermal insulation door. The production line includes an uncoiler, a steel plate cutting device, a roughening device, a molding machine, a glue spraying unit, an embedded part placement unit, an edge sealing device, a double-track temperature control system, a foaming machine, a curing workshop, a cutting machine, and a controller. A conveyor roller is provided between each of the two working units corresponding to adjacent processes of the production line. The uncoiler, steel plate cutting device, roughening device, molding machine, glue spraying unit, embedded part placement unit, edge sealing device, double-track temperature control system, foaming machine, cutting machine, and conveyor roller are all electrically connected to the controller.

[0007] S1. Open book;

[0008] The steel coil installed at the front end of the production line is unwound by the uncoiler, and the uncoiled steel plate coil flows to the steel plate cutting device through the conveyor roller;

[0009] S2. Cut off;

[0010] The steel plate is cut into pieces according to the set size by the steel plate cutting device, and the cut steel plate flows to the forming machine through the conveyor roller;

[0011] S3. Molding;

[0012] The steel plate material is pressed by the rollers of the forming machine, and the profiles obtained after rolling flow to the glue spraying unit through the conveyor roller;

[0013] S4. Glue spraying;

[0014] The glue spraying unit sprays glue onto the profile, thereby improving the viscosity between the profile and the foam during the subsequent foaming process. The glue-sprayed profile flows to the embedded part placement unit through the conveyor roller.

[0015] S5. Place the embedded parts of door frame and door panel;

[0016] The embedded parts placement unit places the door frame embedded parts, door panel embedded parts and auxiliary support parts on the glue-sprayed template. The door frame embedded parts and door panel embedded parts are fixed on the set positions of the template. The template with the embedded parts placed flows to the foaming system through the conveyor roller.

[0017] S6. Positioning;

[0018] The template with the door frame embedded parts and the door panel embedded parts is used as the bottom plate, and the template without the door frame embedded parts and the door panel embedded parts is used as the top plate. The top plate is placed on the bottom plate, with the glue-coated sides of the top plate and the bottom plate facing each other, and the auxiliary support parts support the top plate. Then, the side edges of the top plate and the bottom plate are sealed with tape or sponge through the edge sealing device, so that the top plate and the bottom plate are enclosed into a relatively closed space. The enclosed top plate and the bottom plate flow through the conveyor roller to the space between the two crawlers of the double-track temperature control system. Then, the double-track temperature control system is used to limit the position of the top plate and prevent the side edges of the top plate and the bottom plate from contacting each other.

[0019] S7. Foaming;

[0020] After positioning is completed, polyurethane foam is injected between the top plate and the bottom plate through a foaming machine to obtain a composite board. The composite board flows to the curing workshop through the crawler of the double crawler temperature control system;

[0021] S8. Ripening;

[0022] The double-track temperature control system transfers heat through the track section in the curing workshop, causing the polyurethane foam in the composite board to foam and solidify, thereby quickly completing the curing. The cured composite board flows to the cutting machine through the conveyor roller;

[0023] S9. Cutting and windowing;

[0024] Cutting: Use a cutting machine to cut the cured long composite panels into composite panels the size of thermal insulation doors;

[0025] Window opening: open windows at the locations where door frame embedded parts and door panel embedded parts are installed in the composite board;

[0026] S10. After the door panels are edge-sealed and hardware is installed, a fireproof polyurethane insulated door is obtained.

[0027] Furthermore, the thickness of the steel plate coil is 0.35 to 0.6 mm.

[0028] Furthermore, a roughening device is provided at the discharge end of the steel plate cutting device, and the roughening device is used to rub the upper surface of the cut steel plate to increase the roughness of the inner surface of the steel plate, thereby enhancing the adhesion between the steel plate and the polyurethane foam.

[0029] Furthermore, a glue spreading device is provided at the discharge end of the glue spraying unit, and the glue spreading device is used to spread the glue sprayed on the profile so that the glue is evenly distributed on the inner surface of the profile.

[0030] Furthermore, the polyurethane foam is made of polyether polyol and isocyanate, and the density of the polyurethane foam is 36-45 Kg / m 3 .

[0031] Furthermore, in step S7, before injecting the polyurethane foam, the top plate and the bottom plate are preheated by a dual-track temperature control system. After preheating, the foaming reaction is more stable and the surface of the plate is more easily bonded to the polyurethane foam.

[0032] Furthermore, in step S8, the temperature of the aging workshop is controlled at 65°C.

[0033] Beneficial effects:

[0034] 1. High degree of automation. The production line of the present invention implements combined distribution and overall connection of the equipment corresponding to each process through the controller, centralized control and centralized management, and adopts automatic fixed-length random cutting method to ensure that the functional parts of each process of the entire production line always maintain a normal uniform speed operation, thus realizing fully automatic production.

[0035] 2. High production efficiency. The panel production speed is 3-5 m / min (steplessly adjustable according to panel forming requirements), with an annual production capacity of 250,000 square meters (based on 250 working days per year and 10 hours per day). Pre-placement of door frame and panel embedded components before foaming greatly improves production efficiency. After curing, window openings are made according to the embedded positions, allowing for rapid, efficient, and convenient assembly.

[0036] 3. Easy to operate, it adopts comprehensive computer integrated control technology and uses computer human-machine interface. Under the premise that the raw materials and production of each part are ready, the required operating parameters of the production line of each functional section and the plate cutting length are input to start automatic production.

[0037] 4. Low production costs. With the improvement of the automation level of the equipment, only five to seven operators are needed to complete the entire production process, so that the equipment can maintain normal operation and the production speed is highly efficient, which greatly reduces the production management and labor costs.

[0038] 5. High production quality. The production quality of polyurethane thermal insulation doors produced manually is difficult to guarantee, while the polyurethane thermal insulation doors produced by the method of the present invention can reach Class B.

[0039] Other advantages, objects, and features of the present invention will be described in part in the following description and, in part, will be apparent to those skilled in the art upon examination of the following description or may be learned from practice of the present invention. The objects and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 The present invention is a flow chart of a method for preparing a fireproof polyurethane thermal insulation door. DETAILED DESCRIPTION

[0041] To make the technical solutions, advantages, and purposes of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0042] like Figure 1 As shown, the present invention discloses a method for preparing a fireproof polyurethane thermal insulation door, comprising the following steps:

[0043] Among them, the preparation method of the fireproof polyurethane thermal insulation door is equipped with a production line, which is used to produce the polyurethane thermal insulation door. The production line includes a uncoiler, a steel plate cutting device, a roughening device, a molding machine, a glue spraying unit, an embedded part placement unit, an edge sealing device, a double-track temperature control system, a foaming machine, a curing workshop, a cutting machine and a controller. A conveyor roller is provided between two working units corresponding to adjacent processes of the production line. The uncoiler, steel plate cutting device, roughening device, molding machine, glue spraying unit, embedded part placement unit, edge sealing device, double-track temperature control system, foaming machine, cutting machine and conveyor roller are all electrically connected to the controller;

[0044] S1. Open book;

[0045] The steel coil installed at the front end of the production line is unwound by the uncoiling machine, and the uncoiled steel plate coil flows through the conveyor roller to the steel plate cutting device; wherein, the thickness of the steel plate coil is 0.35-0.6mm;

[0046] S2. Cut off;

[0047] The steel plate is cut into pieces according to the set size by the steel plate cutting device, and the cut steel plate flows to the forming machine through the conveyor roller;

[0048] As a preferred embodiment of this invention, a roughening device is provided at the discharge end of the steel plate cutting device, which is used to rub the upper surface of the cut steel plate to increase the roughness of the inner surface of the steel plate, thereby enhancing the adhesion between the steel plate and the polyurethane foam.

[0049] S3. Molding;

[0050] The steel plate material is pressed by the rollers of the forming machine, and the profiles obtained after rolling flow to the glue spraying unit through the conveyor roller;

[0051] S4. Glue spraying;

[0052] The glue spraying unit sprays glue onto the profile, thereby improving the viscosity between the profile and the foam during the subsequent foaming process. The glue-sprayed profile flows to the embedded part placement unit through the conveyor roller.

[0053] As a preferred embodiment of the present invention, a glue spreading device is provided at the discharge end of the glue spraying unit, and the glue spreading device is used to spread the glue sprayed on the profile so that the glue is evenly distributed on the inner surface of the profile;

[0054] S5. Place the embedded parts of door frame and door panel;

[0055] The embedded parts placement unit places the door frame embedded parts, door panel embedded parts and auxiliary support parts on the glue-sprayed template. The door frame embedded parts and door panel embedded parts are fixed on the set positions of the template. The template with the embedded parts placed flows to the foaming system through the conveyor roller.

[0056] The embedded parts placement unit includes a gantry robot, an infrared beam positioning device, and a camera. During the placement of the door frame and door panel embedded parts, the template stops moving. The infrared beam positioning device marks the placement positions of the door frame and door panel embedded parts on the template. The gantry robot then places the door frame and door panel embedded parts in the corresponding positions. The camera assists the gantry robot in placing the door frame and door panel embedded parts and monitors and records the process.

[0057] S6. Positioning;

[0058] The template with the door frame embedded parts and the door panel embedded parts is used as the bottom plate, and the template without the door frame embedded parts and the door panel embedded parts is used as the top plate. The top plate is placed on the bottom plate, with the glue-coated sides of the top plate and the bottom plate facing each other, and the auxiliary support parts support the top plate. Then, the side edges of the top plate and the bottom plate are sealed with tape or sponge through the edge sealing device, so that the top plate and the bottom plate are enclosed into a relatively closed space. The enclosed top plate and the bottom plate flow through the conveyor roller to the space between the two crawlers of the double-track temperature control system. Then, the double-track temperature control system is used to limit the position of the top plate and prevent the side edges of the top plate and the bottom plate from contacting each other.

[0059] S7. Foaming;

[0060] After positioning is completed, the top plate and the bottom plate are preheated by the double-track temperature control system. After preheating, the foaming reaction is more stable and the surface of the plate is more easily bonded with the polyurethane foam. After preheating, the polyurethane foam is injected into the space between the top plate and the bottom plate by the foaming machine to obtain a composite plate. The composite plate flows to the curing workshop through the tracks of the double-track temperature control system. The polyurethane foam of this embodiment is made of polyether polyol and isocyanate, and the density of the polyurethane foam is 36-45 kg / m 3 ;

[0061] S8. Ripening;

[0062] The double-track temperature control system transfers heat through the track section in the curing workshop, causing the polyurethane foam in the composite board to foam and solidify, thereby quickly completing the curing. The cured composite board flows to the cutting machine through the conveyor roller;

[0063] Among them, the temperature of the aging workshop is always controlled at 65℃;

[0064] S9. Cutting and windowing;

[0065] Cutting: Use a cutting machine to cut the cured long composite panels into composite panels the size of thermal insulation doors;

[0066] Window opening: open windows at the locations where door frame embedded parts and door panel embedded parts are installed in the composite board;

[0067] S10. The door panels are edge-sealed and hardware is installed to obtain a fireproof polyurethane insulation door. The insulation door prepared in this embodiment is a semi-buried cold storage door.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions, which should all be included in the scope of protection of the present invention.

Claims

1. A method for preparing a fireproof polyurethane thermal insulation door, characterized in that: The following steps are involved: The method for preparing the fireproof polyurethane thermal insulation door is equipped with a production line, which is used to produce the polyurethane thermal insulation door. The production line includes an uncoiler, a steel plate cutting device, a roughening device, a molding machine, a glue spraying unit, an embedded part placement unit, an edge sealing device, a double-track temperature control system, a foaming machine, a curing workshop, a cutting machine, and a controller. A conveyor roller is provided between each of the two working units corresponding to adjacent processes of the production line. The uncoiler, steel plate cutting device, roughening device, molding machine, glue spraying unit, embedded part placement unit, edge sealing device, double-track temperature control system, foaming machine, cutting machine, and conveyor roller are all electrically connected to the controller. S1. Open book; The steel coil installed at the front end of the production line is unwound by the uncoiler, and the uncoiled steel plate coil flows to the steel plate cutting device through the conveyor roller; S2. Cut off; The steel plate is cut into pieces according to the set size by the steel plate cutting device, and the cut steel plate flows to the forming machine through the conveyor roller; S3. Molding; The steel plate material is pressed by the rollers of the forming machine, and the profiles obtained after rolling flow to the glue spraying unit through the conveyor roller; S4. Glue spraying; The glue spraying unit sprays glue onto the profile, thereby improving the viscosity between the profile and the foam during the subsequent foaming process. The glue-sprayed profile flows to the embedded part placement unit through the conveyor roller. S5. Place the embedded parts of door frame and door panel; The embedded parts placement unit places the door frame embedded parts, door panel embedded parts and auxiliary support parts on the glue-sprayed template. The door frame embedded parts and door panel embedded parts are fixed on the set positions of the template. The template with the embedded parts placed flows to the foaming system through the conveyor roller. S6. Positioning; The template with the door frame embedded parts and the door panel embedded parts is used as the bottom plate, and the template without the door frame embedded parts and the door panel embedded parts is used as the top plate. The top plate is placed on the bottom plate, with the glue-coated sides of the top plate and the bottom plate facing each other, and the auxiliary support parts support the top plate. Then, the side edges of the top plate and the bottom plate are sealed with tape or sponge through the edge sealing device, so that the top plate and the bottom plate are enclosed into a relatively closed space. The enclosed top plate and the bottom plate flow through the conveyor roller to the space between the two crawlers of the double-track temperature control system. Then, the double-track temperature control system is used to limit the position of the top plate and prevent the side edges of the top plate and the bottom plate from contacting each other. S7. Foaming; After positioning is completed, polyurethane foam is injected between the top plate and the bottom plate through a foaming machine to obtain a composite board. The composite board flows to the curing workshop through the crawler of the double crawler temperature control system; S8. Ripening; The double-track temperature control system transfers heat through the track section in the curing workshop, causing the polyurethane foam in the composite board to foam and solidify, thereby quickly completing the curing. The cured composite board flows to the cutting machine through the conveyor roller; S9. Cutting and windowing; Cutting: Use a cutting machine to cut the cured long composite panels into composite panels the size of thermal insulation doors; Window opening: open windows at the locations where door frame embedded parts and door panel embedded parts are installed in the composite board; S10. After the door panels are edge-sealed and hardware is installed, a fireproof polyurethane insulated door is obtained.

2. The method for preparing a fireproof polyurethane thermal insulation door according to claim 1, characterized in that: The thickness of the steel plate coil is 0.35-0.6 mm.

3. The method for preparing a fireproof polyurethane thermal insulation door according to claim 2, characterized in that: The discharge end of the steel plate cutting device is provided with a roughening device, which is used to rub the upper surface of the cut steel plate to increase the roughness of the inner surface of the steel plate, thereby enhancing the adhesion between the steel plate and the polyurethane foam.

4. The method for preparing a fireproof polyurethane thermal insulation door according to claim 3, characterized in that: The discharging end of the glue spraying unit is provided with a glue spreading device, which is used to spread the glue sprayed on the profile so that the glue is evenly distributed on the inner surface of the profile.

5. The method for preparing a fireproof polyurethane thermal insulation door according to claim 4, characterized in that: The polyurethane foam is made of polyether polyol and isocyanate, and the density of the polyurethane foam is 36-45Kg / m 3 .

6. The method for preparing a fireproof polyurethane thermal insulation door according to claim 5, characterized in that: In step S7, before the polyurethane foam is injected, the top plate and the bottom plate are preheated by a double-track temperature control system.

7. The method for preparing a fireproof polyurethane thermal insulation door according to claim 6, characterized in that: In step S8, the temperature of the aging workshop is controlled at 65°C.

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