Device for foaming polyurethane

Abstract

The utility model provides a polyurethane foam spraying device which comprises at least two feeding tanks used for storing different components and a spiral mixing mechanism connected with the feeding tanks through heating pipelines, and the spiral mixing mechanism is connected with a spraying mechanism. The spiral mixing mechanism comprises a spiral mixing barrel, a rotational flow mixing assembly rotationally arranged in the spiral mixing barrel and a driving mechanism arranged on the spiral mixing barrel and used for driving the rotational flow mixing assembly to rotate. According to the utility model, different components are fully mixed through the spiral mixing mechanism, so that the mixing uniformity is improved, the material reaction is complete, and the quality of sprayed polyurethane is improved; the feeding tanks are connected with the spiral mixing mechanism through the heating pipelines, double-channel independent temperature control is achieved, the material carbonization risk is reduced, the foaming ratio fluctuation range is narrowed to + / -3%, and the spraying polyurethane foam performance is more stable.

Description

Technical Field

[0001] This utility model relates to the field of building construction technology, and in particular to a sprayed polyurethane foam facility. Background Technology

[0002] In building construction, especially in cold regions like northern China where winters are long and temperatures are low, buildings require good insulation to reduce heat loss and lower heating energy consumption. Sprayed polyurethane foam can effectively prevent indoor heat from escaping, keeping the interior warm. It's also useful in scenarios requiring cold storage pipes, where insulation measures are necessary. Sprayed polyurethane foam can effectively insulate these pipes and similar structures.

[0003] Traditional spray polyurethane foam equipment has the following technical drawbacks:

[0004] 1. Uneven mixing: Static mixers rely on laminar flow mixing, resulting in insufficient reaction between components A and B, and a foam closed-cell rate of less than 90%.

[0005] 2. Poor temperature control accuracy: A single heating module cannot synchronously adjust the temperature of the material and pipeline, and the temperature difference fluctuation exceeds ±5℃, which affects the stability of the foaming ratio.

[0006] 3. Frequent nozzle clogging: After the machine is stopped, the residual material hardens and needs to be cleaned manually, which takes an average of 20 to 30 minutes, reducing construction efficiency. Summary of the Invention

[0007] To address the aforementioned technical problems, this utility model proposes a device for spraying polyurethane foam, which solves the problem of uneven mixing in existing spraying polyurethane foam equipment.

[0008] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0009] An apparatus for spraying polyurethane foam includes at least two feed tanks for storing different components, a spiral mixing mechanism connected to each feed tank via heating pipes, and a spraying mechanism connected to the spiral mixing mechanism. The spiral mixing mechanism includes a spiral mixing cylinder, a swirling mixing component rotatably disposed within the spiral mixing cylinder, and a drive mechanism disposed on the spiral mixing cylinder for driving the swirling mixing component to rotate. This invention utilizes the spiral mixing mechanism to ensure thorough mixing of different components, improving mixing uniformity and ensuring complete material reaction, thereby enhancing the quality of the sprayed polyurethane. The feed tanks are connected to the spiral mixing mechanism via heating pipes, enabling dual-channel independent temperature control to reduce the risk of material carbonization and minimize the foaming ratio fluctuation range to ±3%, resulting in more stable performance of the sprayed polyurethane foam.

[0010] Furthermore, the swirling mixing assembly includes a swirling cylinder rotatably disposed within a spiral mixing cylinder and spiral guide vanes inclinedly disposed on the swirling cylinder.

[0011] Furthermore, the spiral guide vane is inclined towards the end closer to the injection mechanism, and the angle between the spiral guide vane and the axis of the spiral mixing cylinder is 30°~50°.

[0012] Furthermore, the cyclone cylinder is circumferentially arranged with at least two sets of spiral guide vanes, each set of spiral guide vanes being spaced apart along the axis of the spiral mixing cylinder; and the spacing between the spiral guide vanes gradually decreases from the end closer to the feed tank to the end closer to the spraying mechanism.

[0013] Furthermore, the drive mechanism includes a driven gear fixed to one end of the cyclone drum, a driving gear rotatably mounted on the spiral mixing drum and meshing with the driven gear, and a motor mounted on the outside of the spiral mixing drum, with the output shaft of the motor connected to the driving gear.

[0014] Furthermore, the surface of the spiral guide vane is coated with a tungsten carbide wear-resistant layer.

[0015] Furthermore, the spraying mechanism includes a spraying cylinder and an air pump disposed on one side of the spraying cylinder. One end of the spraying cylinder is connected to a spiral mixing cylinder, and the other end is provided with a spray hole.

[0016] Furthermore, the outer side of the end of the spray cylinder near the nozzle is covered with an annular outer cover, and radial air holes are provided on the outer periphery of the annular outer cover. The spray cylinder is provided with a through hole that can communicate with the air hole, and the annular outer cover and the end of the spray cylinder are rotatably fitted so that the through hole communicates with or is offset from the air hole.

[0017] Furthermore, the spray nozzle is coated with a nano-oleophobic coating.

[0018] Furthermore, each of the heating pipes includes a pipe body and a silicone heating film disposed on the outside of the pipe body. The silicone heating film is connected to a temperature controller, a relay, and a power supply.

[0019] Furthermore, the spiral mixing cylinder is connected to the spraying mechanism via an insulated pipe; the insulated pipe includes a pipe body and an insulation layer disposed on the outside of the pipe body.

[0020] The beneficial effects of this utility model are:

[0021] 1. The spiral mixing mechanism of this utility model enables the two components to be fully mixed, improves the mixing uniformity, and ensures complete material reaction, thereby improving the quality of sprayed polyurethane.

[0022] 2. The dual-channel independent temperature control of this utility model reduces the risk of material carbonization and reduces the fluctuation range of foaming ratio to ±3%, making the performance of sprayed polyurethane foam more stable.

[0023] 3. This utility model provides an annular outer cover on the nozzle, with holes on the outer periphery of the annular outer cover and the spray cylinder that can be aligned or staggered. After spraying, the holes on the annular outer cover and the spray cylinder can be aligned, and the air pump can introduce clean air to clean the nozzle, thereby extending the nozzle maintenance cycle. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of this utility model;

[0026] Figure 2 This is a schematic diagram of the spiral mixing mechanism of this utility model;

[0027] Figure 3 This is a side view of the spiral mixing mechanism of this utility model.

[0028] Figure 4 This is a schematic diagram of the spray mechanism of this utility model.

[0029] In the figure: 1. First feeding tank, 2. Second feeding tank, 3. Spiral mixing mechanism, 31. Spiral mixing cylinder, 32. Spiral guide vane, 33. Swirl cylinder, 4. Spraying mechanism, 41. Air pump, 42. Spray cylinder, 43. Annular outer cover, 44. Air spray, 5. First heating tube, 6. Second heating tube. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] like Figure 1As shown in Embodiment 1 of this utility model, a device for spraying polyurethane foam includes at least two feeding tanks for storing different component materials, a spiral mixing mechanism 3 for mixing the different component materials, and a spraying mechanism 4 for spraying the mixed polyurethane foam material. The feeding tanks are respectively connected to the spiral mixing mechanism 3 via heating pipes. The spiral mixing mechanism 3 is connected to the spraying mechanism 4 via pipes. The spiral mixing mechanism 3 includes a spiral mixing cylinder 31, a swirling mixing component rotatably disposed within the spiral mixing cylinder 31, and a drive mechanism disposed on the spiral mixing cylinder 31 for driving the swirling mixing component to rotate. The drive mechanism drives the swirling mixing component to rotate, ensuring thorough mixing of the different component materials entering the spiral mixing cylinder 31, resulting in sufficient reaction of the different components, increasing the closed-cell rate of the foam, and thus improving the quality of the sprayed polyurethane foam.

[0032] In this embodiment, two feeding tanks are provided, namely a first feeding tank 1 and a second feeding tank 2, which are used to store isocyanate and polyether polyol, respectively. That is, the two feeding tanks are an isocyanate tank and a polyether polyol tank. In one embodiment, a pressure pump is provided on the tank body of the isocyanate tank and the polyether polyol tank, and the pressure pump adopts the structure of the prior art. The pressure pumps allow the component materials in the isocyanate tank and the polyether polyol tank to enter the spiral mixing drum 31 through pipelines.

[0033] Example 2 differs from Example 1 in that, as Figure 2 and Figure 3 As shown, the swirling mixing assembly includes a swirling cylinder 33 rotatably disposed within a spiral mixing cylinder 31 and spiral guide vanes 32 inclinedly disposed on the swirling cylinder 33. Pipes connecting to the feed tank are respectively connected to the spiral mixing cylinder 31, allowing different component materials to enter the spiral mixing cylinder 31. One end of the spiral mixing cylinder 31 is connected to the feed tank via a pipe as the inlet end, and the other end is connected to the injection mechanism 4 via a pipe as the outlet end. Further, the swirling cylinder 33 is coaxially arranged with the spiral mixing cylinder 31, and both ends of the swirling cylinder 33 are rotatably connected to the two ends of the spiral mixing cylinder 31 via bearings, allowing the swirling cylinder 33 and its spiral guide vanes 32 to rotate within the spiral mixing cylinder 31. A driving mechanism provides power to rotate the swirling cylinder 33, driving the swirling cylinder 33 and its spiral guide vanes 32 to rotate rapidly, thoroughly mixing the component materials entering the spiral mixing cylinder 31, ensuring complete reaction of different components.

[0034] In a preferred embodiment, the spiral mixing cylinder 31 is an aluminum alloy cylindrical tube with a diameter of 200 mm, a height of 400 mm, and a wall thickness of 3 mm. One end of the aluminum alloy cylindrical tube has two 15 mm inlet holes (for connecting pipes to the two feed tanks), and the other end has a 30 mm outlet hole (for connecting the spraying mechanism 4). Furthermore, a base is fixed to the bottom of the spiral mixing cylinder 31 to support it. The base adopts a structure from the prior art.

[0035] like Figure 2 As shown, the root of the spiral guide vane 32 is fixed to the swirl cylinder 33. The outer end of the spiral guide vane 32 extends towards the inner wall of the spiral mixing cylinder 31 and is inclined towards the end near the injection mechanism 4, so that an acute angle is formed between the spiral guide vane 32 and the axis of the spiral mixing cylinder 31. This acute angle is located on the side of the spiral guide vane 32 near the injection mechanism 4, and the other side is an obtuse angle. In this embodiment, the angle between the spiral guide vane 32 and the axis of the spiral mixing cylinder 31 is 30°~50°.

[0036] Furthermore, the swirl tube 33 is circumferentially arranged with at least two sets of spiral guide vanes 32. In this embodiment, as... Figure 2 and Figure 3 As shown, the swirl cylinder 33 has three sets of spiral guide vanes 32 evenly distributed circumferentially. Each set of spiral guide vanes 32 is arranged at intervals along the axis of the spiral mixing cylinder 31. Furthermore, the spacing between adjacent spiral guide vanes 32 within each set gradually decreases from the end closer to the feed tank towards the end closer to the injection mechanism 4. Moreover, adjacent sets of spiral guide vanes 32 are not aligned, but are staggered along the axis of the spiral mixing cylinder 31.

[0037] In a preferred embodiment, the spiral guide vane 32 is made of aluminum alloy. The surface of the spiral guide vane 32 is coated with a tungsten carbide wear-resistant layer to improve the service life of the spiral guide vane 32.

[0038] Example 3 differs from Example 2 in that, as Figure 2 As shown, the driving mechanism includes a driven gear fixed to one end of the swirling cylinder 33, a driving gear rotatably mounted on the spiral mixing cylinder 31 and meshing with the driven gear, and a motor mounted on the outside of the spiral mixing cylinder 31. The output shaft of the motor passes through the spiral mixing cylinder 31 and is connected to the driving gear to drive the rotation of the driving gear, thereby driving the driven gear and the swirling cylinder 33 to rotate.

[0039] Example 4 differs from Example 2 in that, as Figure 4As shown, the spraying mechanism 4 includes a spraying cylinder 42 and an air pump 41 disposed on one side of the spraying cylinder 42. One end of the spraying cylinder 42 is connected to the spiral mixing cylinder 31 via a pipe, and the other end is provided with a spray hole 44, so that one end of the spraying cylinder 42 is an inlet and the other end is an outlet. The air pump 41 is fixed to one side of the spraying cylinder 42 near the inlet end. The air pump 41 is also connected to the spraying cylinder 42. The air pump 41 pressurizes the spraying cylinder 42, causing the material entering the spraying cylinder 42 to be sprayed out from the spray hole 44 for coating.

[0040] Example 5 differs from Example 4 in that, as Figure 4 As shown, the outer side of the spray cylinder 42 near the spray hole 44 is covered with an annular outer cover 43. The annular outer cover 43 has a through hole communicating with the spray hole 44, which does not obstruct the material from being sprayed out of the spray hole. The outer periphery of the annular outer cover 43 has radial air holes. The spray cylinder 42 has a through hole that can be aligned and communicated with the air holes on the annular outer cover 43. The annular outer cover 43 and the end of the spray cylinder 42 are rotatably fitted so that the through hole communicates with or is offset from the air hole. During normal spraying, the air holes of the annular outer cover 43 are offset from the through holes of the spray cylinder 42, preventing material from being sprayed out of the air holes. During cleaning, the air holes of the annular outer cover 43 are aligned and communicate with the through holes of the spray cylinder 42. Pressurization by the air pump 41 causes internal residues to be sprayed out of the air holes, achieving a self-cleaning effect. In a preferred embodiment, the diameter of the air holes is 0.4~0.7mm, and the air holes are arranged in a ring around the axis of the spray cylinder 42 at equal angles of 30° on the annular outer cover 43; the air pump output pressure is 0.6~1.2MPa.

[0041] In this embodiment, the spray nozzle 42 is made of aluminum alloy and coated with a nano-oleophobic coating. In a preferred embodiment, the thickness of the nano-oleophobic coating is 15~25μm, the contact angle is ≥160°, and the surface roughness Ra≤0.1μm.

[0042] Example 6 differs from Example 4 in that, as Figure 1 As shown, the two feeding tanks are connected to the spiral mixing drum 31 via two heating pipes. Specifically, the first feeding tank 1 is connected to the inlet end of the spiral mixing drum 31 via the first heating pipe 5, and the second feeding tank 2 is connected to the inlet end of the spiral mixing drum 31 via the second heating pipe 6. Both heating pipes include a pipe body and a silicone heating film disposed on the outside of the pipe body. The silicone heating film is connected to a power source via a thermostat and a relay. The heating temperature is controlled by the thermostat.

[0043] Example 7 differs from Example 4 in that, as Figure 1As shown, the outlet end of the spiral mixing cylinder 31 is connected to the spraying mechanism 4 via an insulated pipe. The insulated pipe includes a pipe body and an insulation layer disposed on the outside of the pipe body. The insulation layer uses existing insulation materials, such as rock wool or polyurethane foam.

[0044] Example 8, taking the construction of building exterior wall insulation as an example, the working process of the sprayed polyurethane foam device is as follows:

[0045] (1) Inject component A, i.e. isocyanate, and component B, i.e. polyether polyol, into the first feed tank 1 and the second feed tank 2, respectively.

[0046] (2) Set the temperature to 42°C using the temperature controller; start the pressurization pumps on the first feed tank 1 and the second feed tank 2, and start the motor on the spiral mixing drum 31. The isocyanate tank and the polyether polyol tank start feeding, and at the same time, the heating pipe heats the isocyanate and polyether polyol. The heated components A and B enter the spiral mixing drum 31, and the spiral guide vanes 32 of the spiral mixing drum 31 rotate, so that components A (isocyanate) and components B (polyether polyol) are fully mixed. The mixed components are transmitted to the spraying mechanism 4 through the heat-insulating pipe, and pressurized by the air pump 41, so that the mixed material is sprayed out through the spray hole 44 for spraying.

[0047] (3) After the construction is completed, rotate the annular outer cover 43 on the spray cylinder 42 so that the air hole on the annular outer cover 43 coincides with the through hole on the spray cylinder 42. The external air pump 41 triggers a 0.7MPa high-pressure gas pulse (frequency 10Hz) to remove the residue within 3 seconds.

[0048] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any modifications to the technical solutions described in the foregoing embodiments, or equivalent substitutions of some or all of the technical features thereof, within the spirit and principles of the present invention, do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. An apparatus for spraying polyurethane foam, characterized in that: It includes at least two feed tanks for storing different components, a spiral mixing mechanism (3) connected to the feed tanks respectively via heating pipes, and a spraying mechanism (4) connected to the spiral mixing mechanism (3); the spiral mixing mechanism (3) includes a spiral mixing cylinder (31), a swirling mixing component rotatably disposed in the spiral mixing cylinder (31), and a drive mechanism disposed on the spiral mixing cylinder (31) for driving the swirling mixing component to rotate.

2. The apparatus for spraying polyurethane according to claim 1, characterized in that: The swirling mixing assembly includes a swirling cylinder (33) rotatably disposed inside a spiral mixing cylinder (31) and a spiral guide vane (32) inclinedly disposed on the swirling cylinder (33).

3. The apparatus for spraying polyurethane according to claim 2, characterized in that: The spiral guide vane (32) is inclined toward the end closer to the injection mechanism (4), and the angle between the spiral guide vane (32) and the axis of the spiral mixing cylinder (31) is 30°~50°.

4. The apparatus for spraying polyurethane according to claim 2 or 3, characterized in that: The swirling cylinder (33) has at least two sets of spiral guide vanes (32) arranged circumferentially, and each set of spiral guide vanes (32) is arranged at intervals along the axis of the spiral mixing cylinder (31); and the spacing between the spiral guide vanes (32) gradually decreases from the end near the feed tank to the end near the spraying mechanism (4).

5. The apparatus for spraying polyurethane according to claim 2 or 3, characterized in that: The drive mechanism includes a driven gear fixed at one end of the vortex cylinder (33), a driving gear rotatably mounted on the spiral mixing cylinder (31) and meshing with the driven gear, and a motor mounted on the outside of the spiral mixing cylinder (31), with the output shaft of the motor connected to the driving gear.

6. The apparatus for spraying polyurethane according to any one of claims 1 to 3, characterized in that: The spraying mechanism (4) includes a spraying cylinder (42) and an air pump (41) disposed on one side of the spraying cylinder (42). One end of the spraying cylinder (42) is connected to the spiral mixing cylinder (31), and the other end is provided with a spray hole (44).

7. The apparatus for spraying polyurethane according to claim 6, characterized in that: The outer side of the end of the spray tube (42) near the nozzle (44) is covered with an annular outer cover (43), and the annular outer cover (43) is provided with a through hole communicating with the nozzle (44); the outer periphery of the annular outer cover (43) is provided with radial air holes, and the spray tube (42) is provided with a through hole that can communicate with the air holes, and the annular outer cover (43) and the end of the spray tube (42) are rotated to make the air holes communicate with or be staggered from the through holes.

8. The apparatus for spraying polyurethane according to claim 6, characterized in that: The spray tube (42) is coated with a nano-oleophobic coating.

9. The apparatus for spraying polyurethane according to any one of claims 1 to 3, 7 and 8, characterized in that: Each heating pipe includes a pipe body and a silicone heating film disposed on the outside of the pipe body. The silicone heating film is connected to a temperature controller, a relay, and a power supply.

10. The apparatus for spraying polyurethane according to any one of claims 1 to 3, 7 and 8, characterized in that: The spiral mixing cylinder (31) is connected to the spraying mechanism (4) through an insulated pipe; the insulated pipe includes a pipe body and an insulation layer disposed on the outside of the pipe body.

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