Mixing device for polyurethane foam board production

Abstract

The utility model discloses a mixing device for polyurethane foam board production, which comprises a mixing barrel, a discharge port is arranged at the bottom of the mixing barrel, a cover plate is detachably mounted at the top of the mixing barrel, and a stirring mechanism is mounted on the cover plate; the stirring mechanism comprises a stirring motor, a stirring shaft and stirring blades, the stirring motor is mounted on the cover plate, the stirring shaft extends into the mixing barrel and is fixedly connected with an output shaft of the stirring motor, and the stirring blades are mounted on the stirring shaft; a scraping plate is installed on the stirring shaft through a connecting rod, the outer edge of the scraping plate is attached to the inner wall of the mixing barrel, the scraping plate is arranged in an inclined mode, and a baffle is fixed to the upper end face of the scraping plate and arranged along the inner edge of the scraping plate. The scraping plate is driven by the stirring mechanism to move along the inner wall of the material mixing barrel, so that the cleaning liquid at the bottom of the material mixing barrel is lifted along the scraping plate and the baffle, the inner wall of the material mixing barrel is uniformly smeared, automatic cleaning of the material mixing barrel is realized, the use of a cleaning agent is reduced, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of polyurethane foam board production, in particular to a mixing device for producing polyurethane foam boards. Background Technique

[0002] Polyurethane foam board is a commonly used thermal insulation material, mainly applied to fields such as exterior wall insulation of buildings, integration of roof waterproofing and thermal insulation, cold storage thermal insulation, pipeline thermal insulation materials, building boards, refrigerated trucks, and cold storage thermal insulation materials.

[0003] The foaming process of polyurethane foam can be divided into one-step method, semi-prepolymer method, and prepolymer method, among which the one-step method is the most commonly used and simplest polyurethane foaming method. In the one-step method, polyol, isocyanate, foaming agent, and other required additives are simultaneously added to the mixing device for mixing and foaming under high-speed stirring. However, when producing polyurethane foam by the one-step method, the residual polyurethane raw materials will solidify in the mixing device, and a large amount of water and cleaning agents are required for cleaning, resulting in environmental pollution and increased production costs.

[0004] Based on the above technical problems, this application proposes a mixing device for producing polyurethane foam boards. Content of the Utility Model

[0005] The purpose of the utility model is to provide a mixing device for producing polyurethane foam boards to solve the technical problems mentioned in the background technique. The purpose of the utility model is achieved through the following technical solutions:

[0006] A mixing device for producing polyurethane foam boards includes a mixing barrel. An outlet is provided at the bottom of the mixing barrel. A cover plate is detachably installed on the top of the mixing barrel, and a stirring mechanism is installed on the cover plate. The stirring mechanism includes a stirring motor, a stirring shaft, and stirring blades. The stirring motor is installed on the cover plate. The stirring shaft extends into the mixing barrel and is fixedly connected to the output shaft of the stirring motor. The stirring blades are installed on the stirring shaft. A scraping plate is installed on the stirring shaft through a connecting rod. The outer edge of the scraping plate fits the inner wall of the mixing barrel, and the scraping plate is inclined. A baffle is fixed on the upper end surface of the scraping plate and is arranged along the inner edge of the scraping plate.

[0007] Further, the scraping plate includes a first scraping plate and a second scraping plate. The first scraping plate is arranged in a spiral shape along the inner side wall of the mixing barrel. The second scraping plate is arranged along the bottom surface of the mixing barrel. The outer end of the second scraping plate is connected to the lower end of the first scraping plate, and the inner end of the second scraping plate is located on the side of the stirring shaft close to the rotation direction.

[0008] Further, the size of the scraping plate gradually decreases from bottom to top.

[0009] Further, the mixing barrel includes a bracket, an inner barrel and an outer barrel. The outer barrel is installed on the bracket, the inner barrel is installed inside the outer barrel, a heating chamber is formed between the outer wall of the inner barrel and the inner wall of the outer barrel, and a heater is installed in the heating chamber.

[0010] Further, the heating chamber is filled with a heating medium, and a drain port is provided at the bottom of the outer barrel.

[0011] Further, the outer wall of the outer barrel is covered with a heat-insulating sleeve.

[0012] The technical solution provided by the embodiment of the present application has at least the following technical effects or advantages:

[0013] By obliquely installing a scraper in the mixing barrel and installing a baffle on the scraper, and driving the scraper to move along the inner wall of the mixing barrel through a stirring mechanism, the cleaning liquid at the bottom of the mixing barrel is lifted along the scraper and the baffle, so as to realize the uniform coating of the inner wall of the mixing barrel, thereby realizing the automatic cleaning of the mixing barrel, reducing the use of cleaning agents, and reducing the production cost. Description of the Drawings

[0014] The specification drawings forming a part of the present application are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model.

[0015] Figure 1 It is a three-dimensional view of the embodiment of the present application;

[0016] Figure 2 It is a structural schematic diagram of the embodiment of the present application;

[0017] Figure 3 It is a schematic diagram of the scraper installation structure of the embodiment of the present application;

[0018] Figure 4 is Figure 3 a partial enlarged view of.

[0019] Reference numerals in the drawings: 1, mixing barrel; 11, bracket; 12, outer barrel; 13, inner barrel; 14, heat-insulating sleeve; 15, cover plate; 16, drain valve; 17, discharge valve; 2, stirring mechanism; 21, stirring motor; 22, stirring shaft; 23, stirring blades; 24, connecting rod; 3, heater; 4, scraper; 41, first scraper; 42, second scraper; 43, baffle. Detailed Embodiments

[0020] To better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings of the specification and the specific implementation manners. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0021] As Figure 1 、 Figure 2 shown, a mixing device for producing polyurethane foam boards includes a mixing barrel 1 and a stirring mechanism 2. The mixing barrel 1 includes a bracket 11, an outer barrel 12 and an inner barrel 13. The bracket 11 is a rectangular frame welded by square tubes. Both the outer barrel 12 and the inner barrel 13 are cylindrical barrels made of stainless steel. The outer barrel 12 is fixedly installed on the top of the bracket 11. The inner barrel 13 is coaxially installed inside the outer barrel 12. A heating cavity is formed between the outer wall of the inner barrel 13 and the inner wall of the outer barrel 12. The heating cavity is filled with a heating medium, and the heating medium can be water or heat-conducting oil. A discharge port is opened at the bottom of the outer barrel 12, and a discharge valve 16 is installed at the discharge port for discharging the heating medium in the heating cavity. A heater 3 is installed at the bottom of the outer shell 12. The heater 3 is a heating rod, and the heating rod extends into the heating cavity. The heater 3 heats the heating medium, thereby realizing uniform heating of the polyurethane raw material. The outer wall of the outer barrel 12 is covered with a heat-insulating sleeve 14, which on the one hand avoids heat dissipation, and on the other hand also avoids scalding the operating personnel.

[0022] As Figure 1 、 Figure 2 shown, a discharge pipe is connected between the bottom of the inner barrel 13 and the bottom of the outer barrel 12. The upper end of the discharge pipe is communicated with the inside of the inner barrel 13, and a discharge valve 17 is installed at the lower end of the discharge pipe.

[0023] As Figures 1 - 3 shown, a cover plate 15 is installed on the top of the mixing barrel 1. The cover plate 15 is detachably installed on the top of the mixing barrel 1 by means of buckles or bolts. The stirring mechanism 2 is installed on the cover plate 15. The stirring mechanism 2 includes a stirring motor 21, a stirring shaft 22 and stirring blades 23. The stirring motor 21 is fixedly installed on the cover plate 15. The stirring shaft 22 extends into the mixing barrel 1, and the axis of the stirring shaft 22 coincides with the central axis of the mixing barrel 1. The stirring shaft 22 is fixedly connected to the output shaft of the stirring motor 21. Two groups of stirring blades 23 are fixedly installed on the stirring shaft 22. During use, the stirring motor 21 drives the stirring shaft 22 to rotate, thereby driving the stirring blades 23 to stir the raw materials and realizing the mixing of the raw materials.

[0024] As Figure 2As shown, a positioning sleeve is also fixed to the bottom of the inner barrel 13. The positioning sleeve is fixed to the upper side of the discharge pipe through three support plates. The lower end of the stirring shaft 22 is installed in the positioning sleeve through a bearing, thereby improving the stability of the stirring mechanism 2.

[0025] As Figures 2 - 4 shown, a scraper 4 is installed on the stirring shaft 22 through a connecting rod 24. The scraper 4 includes a first scraper 41 and a second scraper 42. The first scraper 41 is arranged in a spiral shape along the inner side wall of the mixing barrel 1, and the outer edge of the first scraper 41 abuts against the inner side wall of the mixing barrel 1. The second scraper 42 is arranged obliquely along the bottom surface of the mixing barrel 1. The outer end of the second scraper 42 is connected to the lower end of the first scraper 41, and the inner end of the second scraper 42 is located on the side of the stirring shaft 22 close to the rotation direction.

[0026] As Figure 3 、 Figure 4 shown, a baffle 43 is fixed to the upper surface of the scraper 4. The baffle 43 and the scraper 4 form a V-shaped structure, and the opening of the V-shaped structure faces the rotation direction of the stirring mechanism 2. During use, the stirring shaft 22 drives the scraper 4 to rotate, which can scrape the raw materials adhering to the inner wall of the mixing barrel 1 and improve the mixing uniformity. During cleaning, only a small amount of cleaning agent needs to be added to the bottom of the mixing barrel 1. The cleaning agent can rise along the V-shaped structure by using the scraper 4 and the baffle 43 to dissolve the residual polyurethane foam, and the scraper 4 can scrape it off to clean the mixing device. Preferably, the size of the scraper 4 gradually decreases from bottom to top, thereby improving the lifting efficiency of the cleaning agent. The cleaning agent can be selected as rosin water.

[0027] The technical solution provided by the embodiment of the present application has at least the following technical effects or advantages:

[0028] By obliquely installing a scraper in the mixing barrel and installing a baffle on the scraper, and driving the scraper to move along the inner wall of the mixing barrel by the stirring mechanism, the cleaning liquid at the bottom of the mixing barrel is lifted along the scraper and the baffle, realizing uniform coating of the inner wall of the mixing barrel, thereby realizing automatic cleaning of the mixing barrel, reducing the use of cleaning agents, and reducing production costs.

[0029] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the orientation words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description. Without contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the protection scope of the present invention: the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0030] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Without additional declaration, the above terms have no special meaning, so it should not be construed as a limitation on the protection scope of the present utility model.

[0031] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A mixing device for producing polyurethane foam boards, characterized in that, It includes a mixing barrel, an outlet is provided at the bottom of the mixing barrel, a cover plate is detachably installed at the top of the mixing barrel, and a stirring mechanism is installed on the cover plate; the stirring mechanism includes a stirring motor, a stirring shaft and stirring blades, the stirring motor is installed on the cover plate, the stirring shaft extends into the mixing barrel, the stirring shaft is fixedly connected to the output shaft of the stirring motor, and the stirring blades are installed on the stirring shaft; a scraping plate is installed on the stirring shaft through a connecting rod, the outer edge of the scraping plate fits with the inner wall of the mixing barrel, and the scraping plate is arranged obliquely, and a baffle is fixed on the upper end surface of the scraping plate, and the baffle is arranged along the inner edge of the scraping plate.

2. The mixing device for producing polyurethane foam boards according to claim 1, characterized in that, The scraping plate includes a first scraping plate and a second scraping plate, the first scraping plate is arranged spirally along the inner side wall of the mixing barrel; the second scraping plate is arranged along the bottom surface of the mixing barrel, the outer end of the second scraping plate is connected to the lower end of the first scraping plate, and the inner end of the second scraping plate is located on one side of the stirring shaft close to the rotation direction.

3. A mixing device for producing polyurethane foam boards according to claim 1, characterized in that, The size of the scraping plate gradually decreases from bottom to top.

4. A mixing device for producing polyurethane foam boards according to claim 1, characterized in that, The mixing barrel includes a bracket, an inner barrel and an outer barrel, the outer barrel is installed on the bracket, the inner barrel is installed in the outer barrel, a heating cavity is formed between the outer wall of the inner barrel and the inner wall of the outer barrel, and a heater is installed in the heating cavity.

5. A mixing device for producing polyurethane foam boards according to claim 4, characterized in that, The heating cavity is filled with a heating medium, and a drain port is provided at the bottom of the outer barrel.

6. A mixing device for producing polyurethane foam boards according to claim 4, characterized in that, The outer wall of the outer barrel is covered with a heat insulation sleeve.

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