Polyurethane spraying device and method for cold storage insulation layer

Abstract

The application discloses a cold storage heat preservation layer polyurethane spraying device, which comprises a ground rail, a trolley and a spraying mechanism. The bottom of the trolley is provided with a sliding assembly which is in sliding connection with the ground rail. The spraying mechanism comprises a supporting frame, a first template, a second template, a rotating shaft, an adjusting support and a plurality of nozzles. The first template and the second template are connected through the rotating shaft. The rotating shaft is connected with the supporting frame through the adjusting support. The supporting frame is connected with the trolley, and the rotating shaft is parallel to the supporting frame. At least one nozzle is arranged on the first template, the second template and the rotating shaft. The nozzles are externally connected with a polyurethane foam source through pipelines. The first template and the second template are switched to coplanar state or internal corner state by rotating, so that the included angle of the first template and the second template is always consistent with the included angle of the spraying area. The thickness of the polyurethane layer sprayed on the planar part of the spraying area and the planar parts on both sides of the corner part is consistent, so that the thickness of the polyurethane layer of the whole spraying area is uniform.

Description

Technical Field

[0001] This invention relates to the field of polyurethane spraying equipment technology, and in particular to a polyurethane spraying device and method for cold storage insulation layers. Background Technology

[0002] Polyurethane spray insulation material is an important branch of the polyurethane industry. It has functions such as heat insulation and waterproofing. In my country, it is mostly used as insulation material for cold storage construction. It can minimize heat exchange between the inside and outside of the cold storage and effectively reduce the loss of refrigeration capacity.

[0003] CN204247423U discloses a mobile polyurethane spraying device that uses a trolley-type mobile polyurethane spraying device for spraying work and only uses one spray gun to spray polyurethane foam. This method cannot guarantee the uniformity of the sprayed polyurethane foam. Furthermore, since the polyurethane foam expands after spraying, the thickness of the polyurethane layer formed after the polyurethane foam has solidified will also be different when the spraying distribution is uneven. Moreover, when spraying the corner part of the area to be sprayed, this method cannot guarantee the uniformity of the thickness of the polyurethane layer on both sides of the corner. Summary of the Invention

[0004] To better achieve uniformity in the thickness of the polyurethane layer in the area to be sprayed, this application provides a polyurethane spraying device and method for cold storage insulation layers.

[0005] In a first aspect, embodiments of this application provide a polyurethane spraying device for cold storage insulation layer, used to spray polyurethane foam onto the planar portion and corner portion of the area to be sprayed, including: a ground track, a trolley and a spraying mechanism.

[0006] The bottom of the trolley is equipped with a sliding component, which is slidably connected to the ground rail;

[0007] The spraying mechanism includes: a support frame, a first template, a second template, a rotating shaft, an adjusting bracket, and multiple nozzles;

[0008] The first template and the second template are connected by a pivot. Rotating the first template and the second template switches them to a concave corner state or a coplanar state.

[0009] The rotating shaft is connected to the support frame via an adjusting bracket;

[0010] The support frame is connected to the trolley, and the rotating shaft is parallel to the support frame;

[0011] The first template, the second template, and the rotating shaft are each provided with at least one nozzle, and the nozzle is connected to a polyurethane foam source through a pipe.

[0012] In one or more optional embodiments of this application, a base is also included;

[0013] The base is located above the trolley and is slidably connected to the trolley, and the support frame is connected to the base;

[0014] The top of the trolley is provided with a plurality of parallel first sliding grooves, and the bottom of the base is provided with a sliding part that matches the first sliding grooves.

[0015] The length direction of the first chute is perpendicular to the length direction of the ground rail.

[0016] In one or more optional embodiments of this application, the base is connected to a drive mechanism, and the drive mechanism drives the base to slide.

[0017] The drive mechanism includes a rack, a drive motor, and gears;

[0018] The rack is mounted on the base, the drive motor is fixed to the base, the drive motor is connected to the gear, and the gear meshes with the rack.

[0019] In one or more optional embodiments of this application, the spraying mechanism further includes: at least one set of driving components for driving the first template and the second template to rotate around the rotating shaft;

[0020] The drive assembly includes two first drive members and a second drive member symmetrically distributed along the rotation axis.

[0021] One end of the first driving component is connected to the first template, and the other end of the first driving component is connected to the adjustment bracket;

[0022] One end of the second driving component is connected to the second template, and the other end of the second driving component is connected to the adjustment bracket;

[0023] The first driving component and the second driving component drive the first template and the second template to switch to a coplanar state or a negative corner state.

[0024] In one or more optional embodiments of this application, the sliding component includes a plurality of rotatable guide members disposed at the bottom of the trolley, the guide members being provided with sliding holes that match the ground rail.

[0025] In one or some optional embodiments of this application, the sliding component is a second slide groove provided along the length direction of the ground rail. The second slide groove matches the ground rail, the width of the second slide groove is greater than the width of the ground rail, and the top of the second slide groove is rotatably connected to the bottom of the trolley.

[0026] In one or more optional embodiments of this application, the sliding component is a swivel wheel, and the swivel wheel is rotatably connected to the ground rail;

[0027] A groove is provided along the circumference of the caster wheel, and the ground rail engages with the groove. The cross-sectional shape of the groove is consistent with the cross-sectional shape of the ground rail, and the width of the groove is greater than the width of the ground rail. When the caster wheel rolls, the groove is always in contact with the ground rail.

[0028] In one or more optional embodiments of this application, the support frame includes vertical support rods and reinforcing trusses;

[0029] The vertical support rod is connected to the base, and two adjacent support rods are connected to the reinforcing truss.

[0030] In one or some optional embodiments of this application, the support frame is composed of multiple standard sections connected in a movable manner.

[0031] In one or some optional embodiments of this application, the first template, the second template, and the rotating shaft are each provided with a plurality of nozzle holes arranged sequentially at intervals along the direction of gravity, the nozzle holes are correspondingly provided with the nozzles, and the outlet end of the nozzle is provided in the nozzle hole.

[0032] Secondly, embodiments of this application provide a method for spraying polyurethane for cold storage insulation layers, using the aforementioned polyurethane spraying device for cold storage insulation layers, the spraying method comprising the following steps:

[0033] S1. When spraying the flat part of the area to be sprayed, rotate the first template and the second template to switch to a coplanar state, drive the trolley to move cyclically along the ground track, turn on the switch of the polyurethane foam source, and spray multiple layers of polyurethane on the flat part of the area to be sprayed in a cyclic manner. After each layer of polyurethane foam has been foamed and cured, the next layer of polyurethane is sprayed.

[0034] S2. When the trolley moves along the ground track to the corner of the area to be sprayed, rotate the first template and the second template to switch to the inside corner state, the included angle of the first template and the second template is consistent with the included angle of the corner, turn on the switch of the polyurethane foam source, and spray the polyurethane layer.

[0035] S3. Spray polyurethane foam onto the surface of the sprayed layer formed after S1 and S2. Before the polyurethane foam has foamed and cured, set a baffle parallel to the area to be sprayed. The polyurethane foam expands to the position of the baffle. After the polyurethane foam has foamed and cured, remove the baffle.

[0036] S4. Apply the coating to the area to be sprayed again according to the methods in S1 and S2, so that the overall polyurethane layer thickness of the area to be sprayed reaches the preset thickness value.

[0037] The beneficial effects of the above-mentioned technical solutions provided in the embodiments of this application include at least the following:

[0038] The polyurethane spraying device for cold storage insulation layer provided in this application includes: a ground rail, a trolley, and a spraying mechanism; the bottom of the trolley is provided with a sliding component rotatably connected to it, and the sliding component is slidably connected to the ground rail; the spraying mechanism includes: a support frame, a first template, a second template, and multiple nozzles; the first template and the second template are connected by a rotating shaft, and rotating the first template and the second template switches to a concave angle state or a coplanar state; the rotating shaft is connected to the support frame through an adjusting bracket; the support frame is perpendicularly connected to the trolley; the rotating shaft is parallel to the support frame; the first template, the second template, and the rotating shaft are each provided with at least one row of nozzles, and the nozzles are connected to a polyurethane foam source through pipes. By rotating the first and second templates to switch between coplanar and concave angle states, the included angle between the first and second templates is always consistent with the included angle of the area to be sprayed. When spraying the flat part of the area to be sprayed, the first and second templates are adjusted to be parallel to the flat part, so that the distance between each nozzle and the flat part is consistent, ensuring that the thickness of the polyurethane layer is consistent. When spraying the corner part of the area to be sprayed, the first and second templates are adjusted so that the included angle between them is consistent with the included angle of the corner part, the rotating shaft is aligned with the protruding part of the corner, and the first and second templates are parallel to the flat areas on both sides of the corner and the spacing is consistent, so as to ensure that the thickness of the polyurethane layer sprayed on the flat areas on both sides of the corner is consistent, thereby making the overall polyurethane layer thickness of the area to be sprayed uniform.

[0039] Other features and advantages of this application will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this application may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings.

[0040] The technical solution of this application will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0041] The accompanying drawings are provided to further illustrate the present application and form part of the specification. They are used together with the embodiments of the present application to explain the application and do not constitute a limitation thereof. In the drawings:

[0042] Figure 1 This is a three-dimensional schematic diagram of the present application;

[0043] Figure 2 This is a three-dimensional schematic diagram of the first and second templates of this application rotated to the inside corner position;

[0044] Figure 3 This is a top view of the first and second templates of this application rotated to the inside corner position;

[0045] Figure 4 This is a schematic diagram of the ground-rail trolley used in this application;

[0046] Figure 5 This is a three-dimensional schematic diagram of the coplanar state of the first template and the second template of this application;

[0047] Figure 6 This is a frontal view of the coplanar state of the first template and the second template of this application;

[0048] Figure 7 A schematic diagram showing the connection of the first template, the second template, and the adjustment bracket to the drive component of this application;

[0049] Figure 8 This is a schematic diagram showing the nozzle distribution locations in this application;

[0050] Figure 9 A schematic diagram of the limiting part provided on the ground rail in this application;

[0051] Figure 10 This is a schematic diagram of the spraying and leveling process in this application;

[0052] Among them, 1. ground rail, 2. trolley, 3. base, 4. support frame, 5. adjusting bracket, 61. first template, 62. second template, 7. nozzle, 8. rotating shaft, 9. drive assembly, 91. first drive component, 92. second drive component, 10. baffle, 11. polyurethane layer, 12. guide component, 13. limiting part, 14. second slide. Detailed Implementation

[0053] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0054] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0055] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0056] As used in this application specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if detected [the described condition or event]" may be interpreted, depending on the context, as meaning "once determined," "in response to determination," "once detected [the described condition or event]," or "in response to detection [the described condition or event]."

[0057] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0058] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0059] It should be understood that the sequence number of each step in the following embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0060] To illustrate the technical solution of this application, specific embodiments are described below.

[0061] The inventors discovered that in the prior art, because polyurethane foam expands after spraying, the thickness of the polyurethane layer formed after the polyurethane foam curing is also different when the spraying distribution is uneven. Moreover, when the method is used to spray the corner part of the area to be sprayed, it cannot guarantee the uniformity of the thickness of the polyurethane layer on both sides of the corner.

[0062] To address the issue of uneven polyurethane coating thickness, the inventors conducted further research and development, resulting in this application, which provides a polyurethane spraying device for cold storage insulation layers. Detailed explanations are provided below through specific embodiments.

[0063] Example 1:

[0064] In one specific embodiment, when spraying the corner part of the area to be sprayed, this application provides a polyurethane spraying device for cold storage insulation layer, which is used to spray polyurethane foam on the flat part and corner part of the area to be sprayed, including: ground rail 1, trolley 2 and spraying mechanism.

[0065] The bottom of the trolley 2 is provided with a sliding component, which is slidably connected to the ground rail 1;

[0066] The spraying mechanism includes: a support frame 4, a first template 61, a second template 62, a rotating shaft 8, an adjusting bracket 5, and multiple nozzles 7;

[0067] The first template 61 and the second template 62 are connected by a rotating shaft 8. Rotating the first template 61 and the second template 62 switches them to a concave corner state or a coplanar state.

[0068] The rotating shaft is connected to the support frame 4 via the adjusting bracket 5;

[0069] The support frame 4 is connected to the trolley 2, and the rotating shaft is parallel to the support frame 4;

[0070] The first template 61, the second template 62 and the rotating shaft 8 are each provided with at least one nozzle 7, and the nozzle 7 is connected to a polyurethane foam source through a pipe.

[0071] In the embodiments of this application, such as Figure 1 As shown, the ground rail 1 is spaced at a suitable distance from the area to be sprayed. The trolley 2 is slidably connected to the ground rail 1 through a sliding component. The support frame 4 is perpendicular to the trolley 2 and connected to it. The spraying mechanism is connected to the support frame 4. The spraying mechanism includes a first template 61 and a second template 62 that are rotatably connected through a rotating shaft 8. The rotating shaft 8 is connected to the support frame 4 through an adjusting bracket 5.

[0072] In one specific embodiment, the ground rail 1 can be configured as, but is not limited to, two parallel ground rails 1. The ground rail 1 includes a parallel segment and an arc segment. The parallel segment and the arc segment of the ground rail 1 are smoothly connected. The length direction of the parallel segment of the ground rail 1 is parallel to the planar portion of the spraying area, and the arc segment of the ground rail 1 is located at the corner of the spraying area. Assuming that the area to be sprayed forms an "opening" on the plane, a closed ground rail 1 is laid along the outer edge of the area to be sprayed, and the area to be sprayed and the ground rail 1 form a "return" on the plane. Because the bottom of the trolley 2 is equipped with a sliding component that is rotatably connected to it, the trolley 2 can smoothly slide on the parallel and curved sections of the ground rail 1, thus allowing it to circulate on the ground rail 1 and reciprocate to spray the area to be sprayed. A universal connector, but not limited to existing technologies, can be used to rotatably connect the trolley 2 to the sliding component. When the trolley 2 moves on the flat portion of the area to be sprayed, it remains parallel to the area. When the trolley 2 moves to a corner of the area, the rotatable connection between the trolley 2 and the sliding component allows the trolley 2 to rotate, enabling it to turn. A drive motor, but not limited to existing technologies, can be connected to the trolley 2 to provide driving force. Two sets of wheels can be symmetrically arranged at the bottom of the trolley 2 to engage with the ground rail 1. The wheels provide reaction force, offering good stability and preventing the trolley 2 from tipping over or derailing.

[0073] In one specific embodiment, the polyurethane foam source can be provided by a foaming device in the prior art. The foaming device can be installed on the trolley 2, and the foaming device is connected to each nozzle 7 through multiple pipes. Control valves are installed on the pipes to control the spraying pressure and spraying speed of the nozzles 7, so as to control the thickness of the polyurethane layer sprayed.

[0074] In one specific embodiment, one end of the adjusting bracket 5 is connected to the support frame 4, and the other end is connected to the rotating shaft 8, such as... Figure 3 or Figure 4 As shown, the adjusting bracket 5 is a cantilever structure. At the same time, the length of the adjusting bracket 5 is adjustable. Adjusting its length allows the first template 61 and the second template 62 to form a suitable distance with the support frame 4, which facilitates the subsequent rotation of the first template 61 and the second template 62. By reasonably adjusting the length of the adjusting bracket 5, the instability of the base 3 or the trolley 2 due to excessive cantilever length can also be avoided.

[0075] In one specific embodiment, by rotating the first template 61 and the second template 62 to switch them to a coplanar state or a concave angle state, the included angle between the first template 61 and the second template 62 is always consistent with the included angle of the area to be sprayed. When the first template 61 and the second template 62 rotate, the rotating shaft 8 remains fixed relative to the adjusting bracket 5. When spraying the planar part of the area to be sprayed, the first template 61 and the second template 62 are adjusted to be parallel to the planar part, so that the distance between each nozzle 7 and the planar part is consistent, ensuring that the thickness of the polyurethane layer is consistent. When spraying the corner part of the area to be sprayed, the first template 61 and the second template 62 are rotated so that the included angle between them is consistent with the included angle of the corner part, the rotating shaft 8 is aligned with the protruding part of the corner, and the first template 61 and the second template 62 are parallel to the planar areas on both sides of the corner and the spacing is consistent, so as to ensure that the thickness of the polyurethane layer sprayed on the planar areas on both sides of the corner is consistent, thereby making the overall polyurethane layer thickness of the area to be sprayed uniform.

[0076] In this embodiment of the application, a base 3 is also included. The base 3 is disposed above the trolley 2 and slidably connected to the trolley 2. The support frame 4 is connected to the base 3.

[0077] The top of the trolley 2 is provided with a plurality of parallel first sliding grooves, and the bottom of the base 3 is provided with a sliding part that matches the first sliding grooves.

[0078] The length direction of the first chute is perpendicular to the length direction of the ground rail 1. When the base 3 slides along the trolley 2, its maximum sliding stroke is greater than the preset thickness value of the polyurethane layer in the area to be sprayed.

[0079] In one specific embodiment, such as Figure 1 and Figure 2 As shown, assuming the running direction of the trolley 2 along the ground track 1 is the X direction, the moving direction of the base 3 relative to the trolley 2 is the Y direction, and the length direction of the support frame 4 is the Z direction. At least two first slide grooves are provided, and the sliding part is provided corresponding to the first slide groove. The sliding part slides along the first slide groove. The shape of the first slide groove can be, but is not limited to, dovetail, T-shaped, U-shaped, V-shaped, etc., and the shape of the sliding part matches the shape of the first slide groove.

[0080] In one specific embodiment, an electric cylinder, but not limited to one used in the prior art, can be used to provide driving force to the base 3. One end of the electric cylinder is fixed to the trolley 2, and the other end of the electric cylinder is connected to the base 3. The extension and retraction movement of the electric cylinder drives the base 3 to slide back and forth along the first slide groove.

[0081] In this embodiment of the application, the base 3 is connected to a driving mechanism, and the driving mechanism drives the base 3 to slide;

[0082] The drive mechanism includes a rack, a drive motor, and gears;

[0083] The rack is mounted on the base 3, the drive motor is fixed to the base 3, the drive motor is connected to the gear, and the gear meshes with the rack.

[0084] In one specific embodiment, besides using an electric cylinder to provide driving force for the base 3 as described above, other transmission mechanisms can also be used to drive the base 3 to slide. For example, a rack can be installed on the base 3, and a motor can be installed on the trolley 2. A gear is connected to the output shaft of the motor, and the gear meshes with the rack. When the motor rotates forward or backward, it drives the gear to rotate forward or backward, and the gear drives the meshing rack to move, thereby causing the base 3 to slide on the trolley 2. Thus, by sliding the base 3, the distance between the base 3 and the area to be sprayed is changed, thereby adjusting the distance between the nozzles 7 on the first template 61 and the second template 62 and the area to be sprayed, thereby changing the position of the sprayed polyurethane foam to adapt to the changes in the thickness of the sprayed multi-layer polyurethane layers, so that the nozzles 7 are always in the appropriate position.

[0085] In this embodiment of the application, the spraying mechanism further includes: at least one set of driving components 9 for driving the first template 61 and the second template 62 to rotate around the rotating shaft 8;

[0086] The drive assembly 9 includes two first drive members 91 and second drive members 92 symmetrically distributed along the rotating axis 8;

[0087] One end of the first driving component 91 is connected to the first template 61, and the other end of the first driving component 91 is connected to the adjusting bracket 5;

[0088] One end of the second driving component 92 is connected to the second template 62, and the other end of the second driving component 92 is connected to the adjusting bracket 5;

[0089] The first driving component 91 and the second driving component 92 drive the first template 61 and the second template 62 to switch to a coplanar state or a concave angle state, so that the included angle between the first template 61 and the second template 62 is always consistent with the included angle of the area to be sprayed, thus ensuring that the thickness of the polyurethane layer is uniform.

[0090] In one specific embodiment, the first driving member 91 and the second driving member 92 can be, but are not limited to, hydraulic cylinders, pneumatic cylinders, or electric cylinders as used in the prior art. Taking the use of a pneumatic cylinder as the driving force as an example, the first driving member 91 is a first pneumatic cylinder, and the second driving member 92 is a second pneumatic cylinder. The extension and retraction of the first and second pneumatic cylinders drive the first template 61 and the second template 62 to rotate relative to each other. Figure 5 , Figure 6 As shown, when the first cylinder and the second cylinder are in the extended state, the first template 61 and the second template 62 are in a coplanar state; as Figure 2 , Figure 3As shown, when the first and second cylinders are in the retracted state, the first template 61 and the second template 62 are in the recessed position. Limiting blocks are provided on the first and second cylinders respectively to prevent them from excessively extending or retracting.

[0091] In this embodiment of the application, the sliding component includes a plurality of rotatable guide members 12 disposed at the bottom of the trolley 2, and the guide members 12 are provided with sliding holes that match the ground rail 1.

[0092] In one specific embodiment, such as Figure 4 As shown, multiple guide members 12 are provided at the bottom of the trolley 2. The guide members 12 are provided with sliding holes through which the ground rail 1 can pass. The sliding holes slide along the ground rail 1 to realize the movement of the trolley 2 on the ground rail 1. At the same time, the sliding holes play a certain limiting role for the trolley 2, which can effectively prevent the trolley 2 from overturning or derailing.

[0093] In this embodiment, the sliding component is a second slide groove 14 arranged along the length of the ground rail 1. The second slide groove 14 matches the ground rail 1, and the width of the second slide groove 14 is greater than the width of the ground rail 1. The top of the second slide groove 14 is rotatably connected to the bottom of the trolley 2. The shape of the second slide groove 14 can be, but is not limited to, dovetail, T-shaped, U-shaped, V-shaped, etc., and the shape of the ground rail 1 matches the shape of the second slide groove 14. Simultaneously, a limiting part 13 can be provided on the ground rail 1. Taking a dovetail-shaped ground rail 1 as an example, for instance... Figure 9 As shown, a cylindrical limiting part 13 is fixedly connected to the ground rail 1. The lower part of the second slide groove 14 is dovetail-shaped, and the upper part of the second slide groove 14 is cylindrical, which matches the ground rail 1. The limiting part 13 can effectively limit the position of the second slide groove 14, thereby improving the anti-overturning and anti-derailment capabilities.

[0094] In this embodiment, the sliding component is a omnidirectional wheel, which is rotatably connected to the ground rail 1. A groove is provided along the circumference of the omnidirectional wheel, and the ground rail 1 engages with the groove. The cross-sectional shape of the groove is consistent with the cross-sectional shape of the ground rail 1, and the width of the groove is greater than the width of the ground rail 1. When the omnidirectional wheel rolls, the groove always abuts against the ground rail 1. The shape of the groove can be, but is not limited to, dovetail, T-shape, U-shape, V-shape, etc. When the omnidirectional wheel rolls along the ground rail 1, it drives the trolley 2 to move on the ground rail 1. The groove matches the ground rail 1, which can limit the movement of the trolley 2 to a certain extent, preventing it from tipping over or derailing. Simultaneously, the omnidirectional structure also allows the trolley 2 to turn at corners in the area to be sprayed. It is worth noting that when the trolley 2 moves on the planar portion of the area to be sprayed, the trolley 2 always remains parallel to the area to be sprayed.

[0095] In this embodiment of the application, the support frame 4 includes vertical support rods and reinforcing trusses;

[0096] The vertical support rod is connected to the base 3, and two adjacent support rods are connected to the reinforcing truss.

[0097] In one specific embodiment, the support frame 4 is arranged along the Z direction and includes vertical support rods and reinforcing trusses. The vertical support rods are connected to the base 3, and two adjacent vertical support rods are connected to the reinforcing trusses. The reinforcing trusses have a triangular structure, which assists in the stability of the vertical support rods and improves the shear and bending resistance of the vertical support rods, so that the entire support frame 4 can meet the strength and stability requirements of the spraying mechanism.

[0098] In this embodiment, the support frame 4 is composed of multiple standard sections connected movably. The support frame 4 is arranged along the Z direction, as shown below. Figure 1 or Figure 2 As shown, the support frame 4 can be assembled from standard sections with triangular or quadrilateral cross sections, with the bottom standard section fixed to the base 3. The spraying mechanism is fixedly connected to one or two standard sections. When adding or removing standard sections, the standard sections are added or removed from below the standard section connected to the spraying mechanism. Meanwhile, to facilitate the subsequent rotation of the first template 61 and the second template 62, one edge of the support frame 4 preferably faces the first template 61 and the second template 62.

[0099] In one specific embodiment, using standard sections as the support frame 4 can improve load-bearing capacity and overall strength, and reduce shaking of the spraying assembly during operation. Simultaneously, the height of the support frame 4 can be changed by adding or removing standard sections, thereby adjusting the height of the spraying mechanism connected to the support frame 4 and enabling spraying operations on areas to be sprayed at different heights.

[0100] In this embodiment of the application, the first template 61, the second template 62 and the rotating shaft 8 are each provided with a plurality of nozzle holes arranged sequentially at intervals along the direction of gravity, and the nozzle holes are correspondingly provided with the nozzles 7, and the outlet end of the nozzle 7 is provided in the nozzle hole.

[0101] In one specific embodiment, such as Figure 8 As shown, since polyurethane foam expands, in order to prevent the polyurethane foam from expanding to contact the nozzle 7 and causing the nozzle 7 to become clogged, the outlet end of the nozzle 7 is located inside the nozzle hole, that is, the nozzle 7 is partially inserted into the nozzle hole, so that the polyurethane foam sprayed on the area to be sprayed will not contact the nozzle 7 after it expands.

[0102] In one specific embodiment, multiple rows of nozzles 7 can be arranged horizontally at intervals on the first template 61 and the second template 62. Taking three rows of nozzles 7 as an example, three rows of nozzles are arranged at intervals on both the first template 61 and the second template 62. When the trolley 2 moves, all nozzles 7 work at the same time, which is equivalent to completing the spraying of three polyurethane layers of equal thickness in the spraying area.

[0103] The inventor discovered that, such as Figure 10 As shown, during the spraying of polyurethane foam, its uneven flow causes local accumulation or loss in the area to be sprayed. In the areas of local accumulation, the polyurethane foam expands and its volume increases further, thus forming obvious raised areas on the surface of the polyurethane layer 11, and obvious sunken areas in the areas of local loss. At the same time, the lost polyurethane foam falls to other areas and forms dot-like protrusions, aggravating the unevenness of the polyurethane layer 11. The obvious raised and sunken areas of the polyurethane layer 11 result in uneven thickness of the overall polyurethane layer 11.

[0104] To address the aforementioned issues, the polyurethane layer 11 is corrected during the spraying of polyurethane foam to ensure that the final thickness of the polyurethane layer 11 remains uniform.

[0105] Based on the same inventive concept, the inventors proposed a spraying method using a polyurethane spraying device for cold storage insulation layers. Because the preset thickness of the polyurethane layer 11 is relatively large, a multi-layer spraying method is adopted. The trolley 2 circulates on the ground track 1 to achieve layer-by-layer spraying. After the inner layer of polyurethane foam has foamed and cured, the next layer of polyurethane foam is sprayed. When the thickness of the polyurethane layer 11 approaches the preset thickness value, the polyurethane layer 11 is corrected, and finally, polyurethane foam is sprayed again to bring the polyurethane layer 11 to the preset thickness value. Specifically, the method includes the following steps:

[0106] S1. When spraying the flat part of the area to be sprayed, drive the drive mechanism to adjust the distance between the base 3 and the area to be sprayed to a suitable position, drive the first drive member 91 and the second drive member 92 to switch the first template 61 and the second template 62 to a coplanar state, drive the trolley 2 to move cyclically along the ground rail 1, turn on the switch of the polyurethane foam source, and cyclically spray multiple layers of polyurethane on the flat part of the area to be sprayed. After each layer of polyurethane foam has been foamed and cured, the next layer of polyurethane is sprayed.

[0107] S2. When the trolley 2 moves cyclically along the ground track 1 to the corner of the area to be sprayed, the first driving member 91 and the second driving member 92 are driven to switch the first template 61 and the second template 62 to the inside corner state, and the included angle of the first template 61 and the second template 62 is consistent with the included angle of the corner. The switch of the polyurethane foam source is turned on, and polyurethane foam is sprayed. The nozzle 7 provided on the rotating shaft 8 is aligned with the protruding position of the corner, and the nozzle 7 on the rotating shaft 8 sprays the protruding position of the corner.

[0108] S3. The thickness of the polyurethane layer 11 formed after spraying S1 and S2 is close to the preset thickness value. Since the sprayed polyurethane layer 11 is relatively thick, the surface of the polyurethane layer 11 may form a concave area or a convex area. After removing the convex area, polyurethane foam is sprayed on the surface of the sprayed layer formed in S1 and S2 for correction. In particular, the spraying time and spraying amount are increased for the concave area. Before the polyurethane foam has foamed and cured, a baffle 10 is arranged parallel to the area to be sprayed. Wait for the polyurethane foam sprayed for correction to foam and expand until it contacts the baffle 10 to limit its further expansion. After the polyurethane foam has cured, the baffle 10 is removed to obtain the corrected and leveled sprayed area.

[0109] S4. Apply the coating to the area to be sprayed again according to the methods in S1 and S2, so that the overall polyurethane layer thickness of the area to be sprayed reaches the preset thickness value.

[0110] In one specific embodiment, by correcting the polyurethane layer 11, the accumulation of uneven spraying areas can be effectively reduced, the uniformity of the thickness of the polyurethane layer 11 can be improved, and the protrusions and pits on the surface of the polyurethane layer 11 can be effectively reduced, so that it has better flatness. After correction, the surface flatness of the polyurethane layer 11 tends to be uniform, and even if flow occurs, the flow is relatively uniform, and the impact on the overall flatness is small.

[0111] In one specific embodiment, the baffle 10 is located behind the traveling direction of the trolley 2, while the spraying mechanism is located in front of the traveling direction of the trolley 2. The trolley 2 is provided with a support structure as in the prior art, and the baffle 10 is detachably connected to the support structure. The baffle 10 is arranged parallel to the area to be sprayed. The detachable connection can be achieved by means of existing technologies such as threaded connection, snap-fit ​​connection, or hinge connection.

[0112] In one specific embodiment, in order to avoid polyurethane residue adhering to the baffle 10, the surface of the baffle 10 can be pre-coated with a release agent from the prior art, so that it can be removed after the polyurethane foam has cured. The amount of release agent used should be such that it does not affect the adhesion of the subsequent polyurethane layer 11 during spraying.

[0113] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A polyurethane spraying device for cold storage insulation layers, used for spraying polyurethane foam onto the flat and corner portions of the area to be sprayed, characterized in that, include: Ground track; The trolley is equipped with a support structure and a sliding component at the bottom of the trolley, which is slidably connected to the ground rail. The spraying mechanism, located in front of the trolley's travel direction, includes a support frame, a first template, a second template, a rotating shaft, an adjusting bracket, and multiple rows of nozzles spaced horizontally on the first and second templates. The first and second templates are connected by the rotating shaft, which is connected to the support frame via the adjusting bracket. The support frame is connected to the trolley, and the rotating shaft is parallel to the support frame. Each of the first template, the second template, and the rotating shaft has at least one nozzle, which is connected to a polyurethane foam source via a pipe. Each of the first template, the second template, and the rotating shaft has multiple nozzle holes arranged sequentially and spaced along the direction of gravity, with nozzles corresponding to the nozzle holes. The nozzle outlet is located inside the nozzle hole. The spraying mechanism also includes at least one set of drive components that drive the first and second templates to rotate around the rotating shaft. The drive components include a first drive member and a second drive member symmetrically distributed along the rotating shaft. One end of the first drive member is connected to the first template, one end of the second drive member is connected to the second template, and the other ends of the first and second drive members are connected to the adjusting bracket. The first and second drive members drive the first and second templates to switch between a coplanar state and a concave corner state. A baffle is located behind the trolley in the direction of travel and parallel to the area to be sprayed, in order to correct the expansion of the sprayed polyurethane foam until it contacts the baffle. The baffle is detachably connected to the support structure. As the trolley moves, multiple rows of nozzles work simultaneously in the spraying area to complete multiple sprayings of polyurethane layers of equal thickness.

2. The polyurethane spraying device for cold storage insulation layer as described in claim 1, characterized in that, Also includes: The base is located above the trolley and is slidably connected to the trolley. A support frame is connected to the base. The top of the trolley is provided with multiple parallel first slide grooves. The bottom of the base is provided with a sliding part that matches the first slide groove. The length direction of the first slide groove is perpendicular to the length direction of the ground rail.

3. The polyurethane spraying device for cold storage insulation layer as described in claim 2, characterized in that, The base is connected to the drive mechanism, which drives the base to slide. The drive mechanism includes a rack, a drive motor, and a gear. The rack is set on the base, the drive motor is fixed to the base, and the drive motor is connected to the gear, which meshes with the rack.

4. The polyurethane spraying device for cold storage insulation layer as described in claim 1, characterized in that, Three rows of nozzles are arranged horizontally at intervals on the first and second templates. As the trolley moves, the three rows of nozzles work simultaneously in the spraying area to complete the spraying of three polyurethane layers of equal thickness.

5. The polyurethane spraying device for cold storage insulation layer as described in claim 1, characterized in that, The sliding assembly includes multiple rotatable guides located at the bottom of the trolley, each guide having a sliding hole that matches the ground rail.

6. The polyurethane spraying device for cold storage insulation layer as described in claim 1, characterized in that, The sliding component is a second slide groove set along the length of the ground rail. The second slide groove matches the ground rail, and the width of the second slide groove is greater than the width of the ground rail. The top of the second slide groove is rotatably connected to the bottom of the trolley.

7. The polyurethane spraying device for cold storage insulation layer as described in claim 1, characterized in that, The sliding component is a universal wheel, which is connected to the ground rail in a rolling manner. A slot is provided along the circumference of the caster wheel, and the ground rail engages with the slot. The cross-sectional shape of the slot is consistent with the cross-sectional shape of the ground rail, and the width of the slot is greater than the width of the ground rail. When the caster wheel rolls, the slot is always in contact with the ground rail.

8. The polyurethane spraying device for cold storage insulation layer as described in claim 2, characterized in that, The support frame includes vertical support rods and reinforcing trusses; the vertical support rods are connected to the base, and two adjacent support rods are connected to the reinforcing trusses.

9. The polyurethane spraying device for cold storage insulation layer as described in claim 7, characterized in that, The support frame is composed of multiple standard sections that are movably connected.

10. A method for spraying polyurethane into a cold storage insulation layer, characterized in that, The application of the polyurethane spraying apparatus for cold storage insulation layer according to any one of claims 1-9 includes the following steps: S1. When spraying the flat part of the area to be sprayed, rotate the first template and the second template to switch to the coplanar state, drive the trolley to move along the ground track in a cycle, turn on the switch of the polyurethane foam source, and spray multiple layers of polyurethane on the flat part of the area to be sprayed in a cycle. After each layer of polyurethane foam has been foamed and cured, the next layer of polyurethane is sprayed. S2. When the trolley moves along the ground track to the corner of the area to be sprayed, rotate the first template and the second template to switch to the inside corner state. The included angle of the first template and the second template is consistent with the included angle of the corner. Turn on the switch of the polyurethane foam source to spray the polyurethane layer. S3. Spray polyurethane foam onto the surface of the sprayed layer formed after S1 and S2. Before the polyurethane foam has foamed and cured, set up a baffle parallel to the area to be sprayed. The polyurethane foam expands to the position of the baffle. After the polyurethane foam has foamed and cured, remove the baffle. S4. Apply the same method as S1 and S2 to the area to be sprayed again, so that the overall polyurethane layer thickness of the area to be sprayed reaches the preset thickness value.

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