CN117123402A

CN117123402A - Polyurethane spraying device and method for heat preservation layer of refrigeration house

Info

Publication number: CN117123402A
Application number: CN202311101070.1A
Authority: CN
Inventors: 刘家胜; 兰云睆; 于龙飞; 杨英艇; 苏博; 殷少鹏; 王磊
Original assignee: China Construction Third Bureau Construction Engineering Co Ltd
Current assignee: China Construction Third Bureau Group Co Ltd
Priority date: 2023-08-30
Filing date: 2023-08-30
Publication date: 2023-11-28

Abstract

The application discloses a polyurethane spraying device for a heat preservation layer of a refrigeration house, which comprises the following components: ground rail, dolly and spraying mechanism; the bottom of the trolley is provided with a sliding component which is in sliding connection with the ground rail; the spraying mechanism includes: the device comprises a support frame, a first template, a second template, a rotating shaft, an adjusting bracket and a plurality of nozzles; the first template and the second template are connected through a rotating shaft; the rotating shaft is connected with the supporting frame through the adjusting bracket; the support frame is connected with the trolley, and the rotating shaft is parallel to the support frame; at least one nozzle is arranged on the first template, the second template and the rotating shaft, and the nozzle is externally connected with a polyurethane foam source through a pipeline. The first template and the second template are switched into a coplanar state or an internal angle state by rotating, so that the included angle of the first template and the second template is consistent with the included angle of the region to be sprayed all the time: the thickness of the polyurethane layer sprayed on the plane part of the area to be sprayed and the plane parts on two sides of the corner part is consistent, so that the thickness of the polyurethane layer of the whole area to be sprayed is uniform.

Description

Polyurethane spraying device and method for heat preservation layer of refrigeration house

Technical Field

The application relates to the technical field of polyurethane spraying equipment, in particular to a polyurethane spraying device and method for a heat insulation layer of a refrigeration house.

Background

The polyurethane spraying heat-insulating material is an important branch of polyurethane industry, has the functions of heat insulation, water resistance and the like, is widely used as a heat-insulating material for constructing a refrigeration house in China, can avoid heat exchange between the inside and the outside of the refrigeration house to the greatest extent, and effectively reduces the loss of refrigerating capacity.

CN204247423U discloses a movable polyurethane spraying device, which adopts a cart type movable polyurethane spraying device to spray polyurethane foam, and only uses one spray gun to spray polyurethane foam, so that uniformity of the sprayed polyurethane foam cannot be ensured, and when the polyurethane foam is sprayed and expanded, and is unevenly distributed, the thickness of a polyurethane layer formed after foaming and solidification of the polyurethane foam is also different, and when the method is used for spraying corner parts of a region to be sprayed, uniformity of the thickness of the polyurethane layer at two sides of the corner cannot be ensured.

Disclosure of Invention

In order to better achieve uniformity of thickness of a polyurethane layer in a region to be sprayed, the embodiment of the application provides a polyurethane spraying device and method for a heat-insulating layer of a refrigeration house.

In a first aspect, an embodiment of the present application provides a polyurethane spraying device for a thermal insulation layer of a refrigerator, for spraying polyurethane foam on a plane portion and a corner portion of a region to be sprayed, including: ground rail, dolly and spraying mechanism;

the bottom of the trolley is provided with a sliding component which is in sliding connection with the ground rail;

the spraying mechanism includes: the device comprises a support frame, a first template, a second template, a rotating shaft, an adjusting bracket and a plurality of nozzles;

the first template and the second template are connected through a rotating shaft, and the first template and the second template are rotated to be switched into an internal angle state or a coplanar state;

the rotating shaft is connected with the supporting frame through an adjusting bracket;

the support frame is connected with the trolley, and the rotating shaft is parallel to the support frame;

at least one nozzle is arranged on the first template, the second template and the rotating shaft, and the nozzle is externally connected with a polyurethane foam source through a pipeline.

In one or some optional implementations of the embodiments of the present application, the apparatus further includes a base;

the base is arranged above the trolley and is connected with the trolley in a sliding manner, and the support frame is connected to the base;

the top of the trolley is provided with a plurality of first sliding grooves which are parallel to each other, and the bottom of the base is correspondingly provided with sliding parts matched with the first sliding grooves;

the length direction of the first sliding groove is perpendicular to the length direction of the ground rail.

In one or some optional implementations of the embodiments of the present application, the base is connected to a driving mechanism, and the driving mechanism drives the base to slide;

the driving mechanism comprises a rack, a driving motor and a gear;

the rack is arranged on the base, the driving motor is fixed on the base, the driving motor is connected with the gear, and the gear is meshed with the rack.

In one or some alternative implementations of the embodiments of the application, the spray mechanism further includes: at least one group of driving components for driving the first template and the second template to rotate around the rotating shaft;

the driving assembly comprises a first driving piece and a second driving piece which are symmetrically distributed along the rotating shaft;

one end of the first driving piece is connected with the first template, and the other end of the first driving piece is connected with the adjusting bracket;

one end of the second driving piece is connected with the second template, and the other end of the second driving piece is connected with the adjusting bracket;

the first driving piece and the second driving piece drive the first template and the second template to be switched into a coplanar state or an internal angle state.

In one or some alternative implementations of the embodiments of the application, the sliding assembly includes a plurality of rotatable guides disposed at the bottom of the cart, the guides having slide holes that mate with the ground rails.

In one or some optional implementations of the embodiment of the present application, the sliding component is a second sliding groove disposed along a length direction of the ground rail, the second sliding groove is matched with the ground rail, a width of the second sliding groove is greater than a width of the ground rail, and a top of the second sliding groove is rotatably connected with a bottom of the trolley.

In one or some optional implementations of the embodiments of the present application, the sliding component is a universal wheel, and the universal wheel is in rolling connection with the ground rail;

a groove is formed in the circumference of the universal wheel, the ground rail is clamped with the groove, the cross section of the groove is consistent with that of the ground rail, and the width of the groove is larger than that of the ground rail; when the universal wheel rolls, the slotting is always abutted with the ground rail.

In one or some optional implementations of the embodiments of the present application, the support frame includes a vertical support bar and a reinforcing truss;

the vertical support rods are connected to the base, and two adjacent support rod pieces are connected with the reinforcing truss.

In one or some alternative implementations of the embodiments of the present application, the support frame is formed by movably connecting a plurality of standard knots.

In one or some optional implementations of the embodiment of the present application, a plurality of nozzle holes are sequentially arranged on the first template, the second template and the rotating shaft at intervals along the gravity direction, the nozzle holes are correspondingly provided with the nozzles, and an outlet end of the nozzle is provided in the nozzle hole.

In a second aspect, an embodiment of the present application provides a method for spraying polyurethane for a thermal insulation layer of a refrigeration house, and the method for spraying polyurethane for the thermal insulation layer of the refrigeration house includes the following steps:

s1, when the plane part of the area to be sprayed is sprayed, the first template and the second template are rotated to be in a coplanar state, the trolley is driven to move circularly along the ground rail, a switch of the polyurethane foam source is turned on, a plurality of polyurethane layers are sprayed on the plane part of the area to be sprayed circularly, and after foaming and solidification of each polyurethane layer are completed, the next polyurethane layer is sprayed;

s2, when the trolley moves to the corner part of the area to be sprayed along the ground rail in a circulating way, the first template and the second template are rotated to be switched into an internal angle state, the included angle between the first template and the second template is consistent with the included angle between the corner part, and a switch of the polyurethane foam source is turned on to spray a polyurethane layer;

s3, spraying polyurethane foam on the surface of the spraying layer formed after the step S1 and the step S2, arranging a baffle plate parallel to the area to be sprayed when the polyurethane foam is not foamed and solidified, expanding the polyurethane foam to the position of the baffle plate, and taking down the baffle plate after the polyurethane foam is foamed and solidified;

s4, spraying the region to be sprayed again according to the methods of S1 and S2, so that the thickness of the polyurethane layer in the whole region to be sprayed reaches a preset thickness value.

The technical scheme provided by the embodiment of the application has the beneficial effects that at least:

the polyurethane spraying device for the heat preservation layer of the refrigeration house provided by the embodiment of the application comprises the following components: ground rail, dolly and spraying mechanism; the bottom of the trolley is provided with a sliding component which is rotationally connected with the trolley, and the sliding component is in sliding connection with the ground rail; the spraying mechanism includes: the device comprises a support frame, a first template, a second template and a plurality of nozzles; the first template and the second template are connected through a rotating shaft, and the first template and the second template are rotated to be switched into a reentrant angle state or a coplanar state; the rotating shaft is connected with the supporting frame through the adjusting bracket; the support frame is vertically connected with the trolley; the rotating shaft is parallel to the supporting frame; at least one row of nozzles are arranged on the first template, the second template and the rotating shaft, and the nozzles are externally connected with a polyurethane foam source through pipelines. The first template and the second template are switched into a coplanar state or an internal angle state by rotating, so that the included angle of the first template and the second template is consistent with the included angle of the region to be sprayed all the time: when the plane part of the area to be sprayed is sprayed, the first template and the second template are adjusted to be parallel to the plane part, so that the distance between each nozzle and the plane part is consistent, and the thickness consistency of the polyurethane layer is ensured; when the corner part of the area to be sprayed is sprayed, the first template and the second template are adjusted to enable the included angle of the first template and the second template to be consistent with the included angle of the corner part, the rotating shaft is aligned with the protruding part of the corner, the first template and the second template are respectively parallel to the plane areas on two sides of the corner and are consistent in distance, so that the thickness of the sprayed polyurethane layer on the plane areas on two sides of the corner is consistent, and the thickness of the whole polyurethane layer of the area to be sprayed is uniform.

Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application. The objectives and other advantages of the application will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings.

The technical scheme of the application is further described in detail through the drawings and the embodiments.

Drawings

The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate the application and together with the embodiments of the application, serve to explain the application. In the drawings:

FIG. 1 is a schematic perspective view of the present application;

FIG. 2 is a perspective view of the first and second templates rotated to an inside corner state according to the present application;

FIG. 3 is a schematic top view of the first and second templates rotated to the inside corner state according to the present application;

FIG. 4 is a schematic view of a ground track mating trolley of the present application;

FIG. 5 is a schematic perspective view of the first and second templates in a coplanar state;

FIG. 6 is a schematic front view of the first and second templates of the present application in a coplanar state;

FIG. 7 is a schematic illustration of a drive assembly of the present application connecting a first die plate, a second die plate and an adjustment bracket;

FIG. 8 is a schematic view of the nozzle distribution position of the present application;

FIG. 9 is a schematic view of a limiting portion provided on a ground rail according to the present application;

FIG. 10 is a schematic illustration of spray leveling of the present application;

the device comprises a ground rail 1, a trolley 2, a base 3, a support frame 4, an adjusting bracket 5, a first template 61, a second template 62, a nozzle 7, a rotary shaft 8, a driving assembly 9, a first driving piece 91, a second driving piece 92, a baffle 10, a polyurethane layer 12, a guide piece 13, a limiting part 14 and a second chute.

Detailed Description

In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.

It should be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

It should also be understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.

As used in the present description and the appended claims, the term "if" may be interpreted as "when..once" or "in response to a determination" or "in response to detection" depending on the context. Similarly, the phrase "if a determination" or "if a [ described condition or event ] is detected" may be interpreted in the context of meaning "upon determination" or "in response to determination" or "upon detection of a [ described condition or event ]" or "in response to detection of a [ described condition or event ]".

Furthermore, the terms "first," "second," "third," and the like in the description of the present specification and in the appended claims, are used for distinguishing between descriptions and not necessarily for indicating or implying a relative importance.

Reference in the specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.

It should be understood that the sequence numbers of the steps in the following embodiments do not mean the order of execution, and the execution order of the processes should be determined by the functions and the internal logic, and should not be construed as limiting the implementation process of the embodiments of the present application.

In order to illustrate the technical scheme of the application, the following description is made by specific examples.

The inventor found that in the prior art, since the polyurethane foam expands after spraying, when the spraying distribution is uneven, the thickness of the polyurethane layer formed after foaming and curing of the polyurethane foam is also different, and the method cannot ensure the uniformity of the thickness of the polyurethane layer at both sides of the corner when spraying the corner part of the area to be sprayed.

In order to solve the problem of uneven thickness of the polyurethane coating, the inventor has further developed and made the application to provide a polyurethane spraying device for a heat insulation layer of a refrigeration house, and the polyurethane spraying device is described in detail by specific examples.

Embodiment one:

in a specific embodiment, when spraying is performed on corner portions of an area to be sprayed, the embodiment of the application provides a polyurethane spraying device for a thermal insulation layer of a refrigeration house, which is used for spraying polyurethane foam on planar portions and corner portions of the area to be sprayed, and comprises the following steps: ground rail 1, dolly 2 and spraying mechanism;

the bottom of the trolley 2 is provided with a sliding component which is in sliding connection with the ground rail 1;

the spraying mechanism includes: the device comprises a support frame 4, a first template 61, a second template 62, a rotating shaft 8, an adjusting bracket 5 and a plurality of nozzles 7;

the first template 61 and the second template 62 are connected through a rotating shaft 8, and the first template 61 and the second template 62 are rotated to be switched into a reentrant angle state or a coplanar state;

the rotating shaft is connected with the supporting frame 4 through an adjusting bracket 5;

the support frame 4 is connected with the trolley 2, and the rotating shaft is parallel to the support frame 4;

at least one nozzle 7 is arranged on the first template 61, the second template 62 and the rotating shaft 8, and the nozzle 7 is externally connected with a polyurethane foam source through a pipeline.

In the embodiment of the application, as shown in fig. 1, a ground rail 1 and a region to be sprayed are separated by a proper distance, a trolley 2 is in sliding connection with the ground rail 1 through a sliding component, a support frame 4 is perpendicular to the trolley 2 and connected with the trolley 2, a spraying mechanism is connected with the support frame 4, wherein the spraying mechanism comprises a first template 61 and a second template 62 which are rotatably connected through a rotating shaft 8, and the rotating shaft 8 is connected with the support frame 4 through an adjusting support 5.

In a specific embodiment, the ground rail 1 may be configured as, but is not limited to, two mutually parallel ground rails 1, the ground rail 1 includes a parallel section and an arc section, the parallel section of the ground rail 1 is in smooth connection with the arc section of the ground rail 1, wherein the length direction of the parallel section of the ground rail 1 is parallel to the plane portion of the painting area, and the arc section of the ground rail 1 is disposed at the corner portion of the painting area. Assuming that a port is formed on a plane of the region to be sprayed, paving a closed ground rail 1 on the outer edge of the region to be sprayed, and forming a return path on the plane of the region to be sprayed and the ground rail 1. The bottom of the trolley 2 is provided with the sliding component which is rotationally connected with the trolley, so that the trolley 2 can smoothly slide on the parallel section and the arc section of the ground rail 1, and can circularly move on the ground rail 1 to spray the region to be sprayed back and forth, wherein the trolley 2 can be rotationally connected with the sliding component by adopting but not limited to a universal connector in the prior art; when the trolley 2 moves on the plane part of the area to be sprayed, the trolley 2 always keeps parallel to the area to be sprayed, and when the trolley 2 moves to the corner part of the area to be sprayed, the trolley 2 is rotationally connected with the sliding rotating piece, so that the body of the trolley 2 can be rotated, and turning of the trolley 2 is realized. A drive motor of the prior art may be used, but is not limited to, in connection with the trolley 2 to provide the driving force for the trolley 2. Two groups of wheels can be symmetrically arranged at the bottom of the trolley 2 to be matched with the ground rail 1, and the wheels can provide counter force, so that the trolley has good stability and can be prevented from overturning and derailing the trolley 2.

In a specific embodiment, the polyurethane foam source may provide polyurethane foam using foaming equipment of the prior art. The foaming equipment can be arranged on the trolley 2 and is respectively communicated with each nozzle 7 through a plurality of pipelines, and the pipelines are provided with control valves, so that the spraying pressure and the spraying speed of the nozzles 7 can be controlled to control the thickness of the polyurethane layer sprayed by the foaming equipment.

In a specific embodiment, one end of the adjusting bracket 5 is connected with the supporting frame 4, the other end is connected with the rotating shaft 8, as shown in fig. 3 or fig. 4, the adjusting bracket 5 is in a cantilever structure, meanwhile, the length of the adjusting bracket 5 can be adjusted, and the length of the adjusting bracket is adjusted to enable the first template 61 and the second template 62 to form a proper distance with the supporting frame 4, so that the following rotation of the first template 61 and the second template 62 is facilitated; by reasonably adjusting the length of the adjusting bracket 5, the instability of the base 3 or the trolley 2 caused by overlong cantilever can be avoided.

In a specific embodiment, by rotating the first template 61 and the second template 62 to switch to the coplanar state or the internal 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, and when the first template 61 and the second template 62 rotate, the rotating shaft 8 is always kept fixed relative to the adjusting bracket 5: when the plane part of the area to be sprayed is sprayed, the first template 61 and the second template 62 are adjusted to be parallel to the plane part, so that the distance between each nozzle 7 and the plane part is consistent, and the thickness consistency of the polyurethane layer is ensured; when the corner part of the area to be sprayed is sprayed, the first template 61 and the second template 62 are rotated to enable the included angle of the first template 61 and the second template to be 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 respectively parallel to the plane areas on two sides of the corner and are consistent in distance to ensure that the thickness of the sprayed polyurethane layers on the plane areas on two sides of the corner is consistent, so that the thickness of the whole polyurethane layer of the area to be sprayed is uniform.

In the embodiment of the application, the device further comprises a base 3, wherein the base 3 is arranged above the trolley 2 and is in sliding connection with the trolley 2, and the support frame 4 is connected to the base 3;

the top of the trolley 2 is provided with a plurality of first sliding grooves which are parallel to each other, and the bottom of the base 3 is correspondingly provided with sliding parts matched with the first sliding grooves;

the length direction of the first sliding groove is perpendicular to the length direction of the ground rail 1, and when the base 3 slides along the trolley 2, the maximum sliding travel of the base is larger than the preset thickness value of the polyurethane layer in the to-be-sprayed area.

In a specific embodiment, as shown in fig. 1 and 2, assuming that the running direction of the trolley 2 along the ground rail 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. The first sliding grooves are at least two, the sliding parts are arranged corresponding to the first sliding grooves, the sliding parts slide along the first sliding grooves, the shapes of the first sliding grooves can be dovetail shapes, T shapes, U shapes, V shapes and the like, and the shapes of the sliding parts are matched with those of the first sliding grooves.

In a specific embodiment, but not limited to, an electric cylinder in the prior art may be used to provide a driving force for the base 3, one end of the electric cylinder is fixed on the trolley 2, the other end of the electric cylinder is connected to the base 3, and the telescopic movement of the electric cylinder drives the base 3 to slide back and forth along the first chute.

In the embodiment of the application, the base 3 is connected with a driving mechanism, and the driving mechanism drives the base 3 to slide;

the driving mechanism comprises a rack, a driving motor and a gear;

the rack is arranged on the base 3, the driving motor is fixed on the base 3, the driving motor is connected with the gear, and the gear is meshed with the rack.

In a specific embodiment, besides the above-mentioned use of an electric cylinder to provide driving force for the base 3, other transmission mechanisms can be used to drive the base 3 to slide, for example, a rack is arranged on the base 3, a motor is arranged on the trolley 2, a gear is connected to an output shaft of the motor, the gear is meshed with the rack, and when the motor is forward or reverse, the gear is driven to forward or reverse, and the gear drives the rack meshed with the gear to move, so that the base 3 is driven to slide on the trolley 2. Therefore, by sliding the base 3, the distance between the base 3 and the area to be sprayed is changed, so that the distance between the nozzles 7 on the first template 61 and the second template 62 and the area to be sprayed is adjusted, the position of spraying polyurethane foam is changed, the thickness of the sprayed multilayer polyurethane layer is changed, and the nozzles 7 are always in proper positions.

In an embodiment of the present application, the spraying mechanism further includes: at least one set of driving assemblies 9 for driving the first and second templates 61 and 62 to rotate about the rotation axis 8;

the driving assembly 9 comprises two first driving parts 91 and second driving parts 92 symmetrically distributed along the rotating shaft 8;

one end of the first driving member 91 is connected to the first mold plate 61, and the other end of the first driving member 91 is connected to the adjusting bracket 5;

one end of the second driving member 92 is connected with the second template 62, and the other end of the second driving member 92 is connected with the adjusting bracket 5;

the first driving member 91 and the second driving member 92 drive the first template 61 and the second template 62 to be switched into a coplanar state or an internal angle state, so that the included angle between the first template 61 and the second template 62 is consistent with the included angle of the region to be sprayed all the time, and the thickness uniformity of the polyurethane layer is ensured.

In a specific embodiment, the first driving member 91 and the second driving member 92 may be, but are not limited to, an oil cylinder, an air cylinder, or an electric cylinder in the prior art, and taking the air cylinder as a driving force as an example, the first driving member 91 is a first air cylinder, the second driving member 92 is a second air cylinder, and the first mold plate 61 and the second mold plate 62 are driven to rotate mutually by the expansion and contraction of the first air cylinder and the second air cylinder, as shown in fig. 5 and 6, when the first air cylinder and the second air cylinder are in an extended state, the first mold plate 61 and the second mold plate 62 are in a coplanar state; as shown in fig. 2 and 3, when the first cylinder and the second cylinder are in the contracted state, the first mold plate 61 and the second mold plate 62 are in the inside corner state. Limiting blocks are respectively arranged on the first cylinder and the second cylinder, so that excessive expansion and contraction of the limiting blocks are avoided.

In an embodiment of the application, the sliding assembly comprises a plurality of rotatable guides 12 arranged at the bottom of the trolley 2, the guides 12 being provided with sliding holes matching the ground rail 1.

In a specific embodiment, as shown in fig. 4, a plurality of guiding elements 12 are arranged at the bottom of the trolley 2, sliding holes through which the ground rail 1 can pass are arranged on the guiding elements 12, and the sliding holes slide along the ground rail 1 to realize the movement of the trolley 2 on the ground rail 1. Meanwhile, the sliding hole plays a certain limiting role on the trolley 2, and can effectively prevent the trolley 2 from overturning and derailing.

In the embodiment of the present application, the sliding component is a second sliding groove 14 disposed along the length direction of the ground rail 1, the second sliding groove 14 is matched with the ground rail 1, the width of the second sliding groove 14 is greater than the width of the ground rail 1, and the top of the second sliding groove 14 is rotatably connected with the bottom of the trolley 2. The shape of the second runner 14 may 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 runner 14. Meanwhile, a limit part 13 can be arranged on the ground rail 1, taking the dovetail-shaped ground rail 1 as an example for explanation, as shown in fig. 9, a cylindrical limit part 13 is fixedly connected on the ground rail 1, the lower part of the second sliding groove 14 is in a dovetail shape, the upper part of the second sliding groove 14 is in a cylindrical shape, and the limit part 13 can well limit the position of the second sliding groove 14 to improve the anti-overturning and anti-derailing capabilities in matching with the ground rail 1.

In the embodiment of the application, the sliding component is a universal wheel, and the universal wheel is in rolling connection with the ground rail 1; the universal wheel is provided with a slot along the circumferential direction of the universal wheel, the ground rail 1 is clamped with the slot, the section shape of the slot is consistent with that of the ground rail 1, and the width of the slot is larger than that of the ground rail 1; when the universal wheel rolls, the slotting is always abutted with the ground rail 1. The shape of the slot may take the form of, but is not limited to, a dovetail, a T, a U, a V, etc. When the universal wheels roll along the ground rail 1, the trolley 2 is driven to move on the ground rail 1, the slotting is matched with the ground rail 1, a certain limiting effect can be achieved on the trolley 2, overturning and derailing of the trolley can be prevented, meanwhile, the turning of the trolley 2 at the corner part of the to-be-sprayed area can be achieved by adopting the universal structure, and the fact that the trolley 2 is always kept parallel to the to-be-sprayed area when the trolley 2 moves at the plane part of the to-be-sprayed area is remarkable.

In the embodiment of the application, the supporting frame 4 comprises a vertical supporting rod and a reinforcing truss;

the vertical support rods are connected to the base 3, and two adjacent support rod pieces are connected with the reinforcing truss.

In a specific embodiment, the support frame 4 is arranged along the Z direction, and comprises vertical support rods and reinforcing trusses, wherein the vertical support rods are connected with the base 3, two adjacent vertical support rods are connected with the reinforcing trusses, the reinforcing trusses are of triangular structures, the stability of the vertical support rods is assisted, and the shearing resistance and the bending resistance of the vertical support rods are improved, so that the whole support frame 4 can meet the strength and stability requirements of a bearing spraying mechanism.

In the embodiment of the present application, the supporting frame 4 is formed by movably connecting a plurality of standard knots. The support frame 4 is arranged along the Z direction, as shown in fig. 1 or fig. 2, the support frame 4 may be formed by splicing standard sections with triangular sections or quadrangular sections, and the standard section at the bottom of the support frame is fixed with the base 3. Fixedly connecting the spraying mechanism with one or two standard joints, and adding or detaching the standard joint from the lower part of the standard joint connected with the spraying mechanism when the standard joint is increased or decreased; meanwhile, in order to facilitate the rotation of the first and second templates 61 and 62 later, one edge of the support frame 4 is preferably directed toward the first and second templates 61 and 62.

In a specific embodiment, the standard joint is used as the supporting frame 4, so that the bearing capacity and the overall strength can be improved, and the shaking of the spraying assembly in the working process can be reduced. Meanwhile, the height of the supporting frame 4 can be changed by increasing or decreasing the standard section, so that the height of a spraying mechanism connected with the supporting frame 4 is adjusted, and spraying operation is performed on areas to be sprayed at different height positions.

In the embodiment of the present application, a plurality of nozzle holes are sequentially arranged on the first template 61, the second template 62 and the rotating shaft 8 at intervals along the gravity direction, the nozzle holes are correspondingly provided with the nozzles 7, and the outlet ends of the nozzles 7 are arranged in the nozzle holes.

In one embodiment, as shown in fig. 8, since the polyurethane foam expands, in order to avoid the polyurethane foam expanding to contact the nozzle 7 to cause the blocking of the nozzle 7, the outlet end of the nozzle 7 is disposed in the nozzle hole, i.e., the nozzle 7 is slightly inserted into the nozzle hole, so that the polyurethane foam sprayed on the area to be sprayed does not contact with the nozzle 7 after it expands.

In a specific embodiment, a plurality of rows of nozzles 7 distributed at intervals in the horizontal direction may be disposed on the first template 61 and the second template 62, and three rows of nozzles 7 are taken as an example for illustration, and three rows of collision nozzles are disposed on the first template 61 and the second template 62 at intervals, and when the trolley 2 moves, all the nozzles 7 work simultaneously, which is equivalent to finishing three spraying of polyurethane layers with equal thickness in the spraying area.

The inventors found that, when the polyurethane foam is sprayed, the polyurethane foam is locally accumulated or locally lost in the region to be sprayed due to the uneven flow thereof, and the volume thereof is further increased after the polyurethane foam expands in the locally accumulated region, so that a distinct convex region is formed on the surface of the polyurethane layer 11, a distinct concave region is formed in the locally lost region, and at the same time, the lost polyurethane foam falls to other regions to form a punctiform convex, thereby aggravating the non-uniformity of the polyurethane layer 11, and the distinct convex region and concave region of the polyurethane layer 11 cause the non-uniformity of the thickness of the entire polyurethane layer 11.

In order to solve the above-mentioned problems, the polyurethane layer 11 is corrected during the process of spraying the polyurethane foam so that the thickness of the final polyurethane layer 11 is maintained to be uniform.

Based on the same inventive concept, the inventor provides a spraying method using a polyurethane spraying device for a heat preservation layer of a refrigerator, because the preset thickness value of a polyurethane layer 11 is larger, a multilayer spraying mode is adopted, a trolley 2 circularly moves on a ground rail 1 to realize layer-by-layer spraying construction, after foaming and solidification of inner polyurethane foam are completed, the next polyurethane foam is sprayed, when the thickness of the polyurethane layer 11 is close to the preset thickness value, the polyurethane layer 11 is corrected, and finally the polyurethane foam is sprayed again to enable the polyurethane layer 11 to reach the preset thickness value. The method specifically comprises the following steps:

s1, when the plane part of the area to be sprayed is sprayed, driving the driving mechanism to adjust the distance between the base 3 and the area to be sprayed to a proper position, driving the first driving piece 91 and the second driving piece 92 to enable the first template 61 and the second template 62 to be switched to a coplanar state, driving the trolley 2 to circularly move along the ground rail 1, opening a switch of the polyurethane foam source, circularly spraying a plurality of polyurethane layers on the plane part of the area to be sprayed, and spraying a next polyurethane layer after foaming and curing of each polyurethane layer are completed;

s2, when the trolley 2 moves to the corner part of the area to be sprayed along the ground rail 1 in a circulating way, driving the first driving piece 91 and the second driving piece 92 to enable the first template 61 and the second template 62 to be switched into an internal angle state, enabling the included angle between the first template 61 and the second template 62 to be consistent with the included angle between the corner part, opening a switch of the polyurethane foam source, spraying polyurethane foam, wherein a nozzle 7 arranged on a rotating shaft 8 is aligned with the protruding position of the corner part, and spraying the protruding position of the corner part by the nozzle 7 on the rotating shaft 8;

s3, after the spraying of the S1 and the S2 is finished, the thickness of the formed polyurethane layer 11 is close to a preset thickness value, due to the fact that the sprayed polyurethane layer 11 is thicker, a concave area or a convex area may be formed on the surface of the polyurethane layer 11, after the convex area is removed, polyurethane foam is sprayed on the surface of the sprayed layer formed by the S1 and the S2 for correction, wherein spraying time and spraying amount are increased for the concave area, when the polyurethane foam is not foamed and solidified, a baffle 10 is arranged parallel to an area to be sprayed, foaming expansion of the polyurethane foam subjected to correction spraying is waited until the contact baffle 10 limits further expansion, and after the polyurethane foam is solidified, the baffle 10 is removed, so that a corrected and flattened spraying area is obtained;

In a specific embodiment, by correcting the polyurethane layer 11, accumulation of uneven spraying areas can be effectively slowed down, uniformity of thickness of the polyurethane layer 11 is improved, protrusions and pits on the surface of the polyurethane layer 11 are effectively reduced, and good flatness is achieved; the surface flatness of the corrected polyurethane layer 11 tends to be consistent, even if flowing occurs, the flowing is relatively uniform, and the influence on the overall flatness is small.

In a specific embodiment, the baffle 10 is arranged behind the travelling direction of the trolley 2, wherein the spraying mechanism is arranged in front of the travelling direction of the trolley 2. The trolley 2 is provided with a supporting structure in the prior art, the baffle 10 is detachably connected with the supporting structure, and the baffle 10 is parallel to the area to be sprayed, wherein the detachable connection mode can adopt the modes of threaded connection, buckle connection, hinge connection and the like in the prior art.

In one embodiment, in order to avoid the adhesion of polyurethane residues on the baffle 10, the surface of the baffle 10 may be pre-coated with a release agent in the prior art, so as to facilitate the removal of the polyurethane foam after curing, so that the release agent is used in an amount that does not affect the adhesion of the polyurethane layer 11 during the subsequent spraying.

It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims

1. A freezer heat preservation polyurethane spraying device for the spraying polyurethane foam of the plane part and the corner part of the area to be sprayed, which is characterized in that the device comprises: ground rail, dolly and spraying mechanism;

the rotating shaft is connected with the supporting frame through the adjusting bracket;

2. The polyurethane spraying device for the heat preservation layer of the refrigerator according to claim 1, further comprising a base;

3. The polyurethane spraying device for the heat preservation layer of the refrigerator according to claim 2, wherein the base is connected with a driving mechanism, and the driving mechanism drives the base to slide;

the driving mechanism comprises a rack, a driving motor and a gear;

4. The polyurethane spraying device for the heat preservation layer of the refrigerator according to claim 1 or 3, wherein the spraying mechanism further comprises: at least one group of driving components for driving the first template and the second template to rotate around the rotating shaft;

the first driving piece and the second driving piece drive the first template and the second template to be switched into a coplanar state or a reentrant angle state.

5. The polyurethane spraying device for the heat preservation of the refrigerator according to claim 4, wherein the sliding assembly comprises a plurality of rotatable guide members arranged at the bottom of the trolley, and the guide members are provided with sliding holes matched with the ground rail.

6. The polyurethane spraying device for the heat preservation layer of the refrigeration house according to claim 4, wherein the sliding component is a second sliding groove arranged along the length direction of the ground rail, the second sliding groove is matched with the ground rail, the width of the second sliding groove is larger than that of the ground rail, and the top of the second sliding groove is rotationally connected with the bottom of the trolley.

7. The polyurethane spraying device for the heat preservation layer of the refrigeration house according to claim 4, wherein the sliding component is a universal wheel, and the universal wheel is in rolling connection with the ground rail;

8. The polyurethane spraying device for the heat preservation layer of the refrigeration house according to claim 2, wherein the supporting frame comprises a vertical supporting rod and a reinforcing truss;

9. The polyurethane spraying device for the heat preservation layer of the refrigeration house according to claim 7, wherein the supporting frame is formed by movably connecting a plurality of standard knots.

10. The polyurethane spraying device for the heat preservation layer of the refrigeration house according to claim 8 or 9, wherein a plurality of nozzle holes are sequentially arranged on the first template, the second template and the rotating shaft at intervals along the gravity direction, the nozzle holes are correspondingly provided with the nozzles, and the outlet end of the nozzle is arranged in the nozzle holes.

11. A polyurethane spraying method for a heat insulation layer of a refrigeration house, which is characterized by applying the polyurethane spraying device for the heat insulation layer of the refrigeration house according to any one of claims 1 to 10, wherein the spraying method comprises the following steps: