Polyurethane foam board raw material premixing device

Abstract

The utility model discloses a polyurethane foam board raw material premixing device which comprises a premixing tank, the premixing tank is a cylindrical shell, spiral blades are arranged on the inner wall of the premixing tank, a plurality of feeding ports are formed in the side face of the upper portion of the premixing tank, a discharging port is formed in the bottom of the premixing tank, first valves are arranged at the feeding ports, and second valves are arranged at the discharging port. A piston cavity is formed in the top of the premixing tank and communicated with the premixing tank, a reciprocating telescopic mechanism is mounted on the upper side of the piston cavity, and a piston is slidably mounted in the piston cavity and connected with the reciprocating telescopic mechanism. Raw materials are pumped into the premixing tank through upward movement of the piston, different raw materials are mixed along the spiral blade through downward pressing of the piston and then extruded out of the lower end of the premixing tank, full mixing of the raw materials is achieved, the mixing uniformity of the raw materials is improved, and the product quality is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of polyurethane foam board production, in particular to a raw material premixing device for polyurethane foam boards. Background Art

[0002] Polyurethane is a general term for macromolecular compounds containing repeating urethane groups in the main chain, which is formed by the addition polymerization of organic diisocyanates or polyisocyanates with dihydroxy or polyhydroxy compounds. Polyurethane foam is prepared from polyols, isocyanates and various additives, and has the advantages of low density, light weight, heat insulation and sound insulation, high specific strength, vibration damping, etc.

[0003] Since polyester or polyether generally has a high viscosity at room temperature, direct foaming is likely to cause uneven mixing of materials. Therefore, it is necessary to pre-mix polyester polyol or polyether polyol with isocyanate through a premixing device. Most of the existing raw material premixing devices for polyurethane foam boards stir the raw materials by driving the stirring shaft to rotate by a motor, and cannot stir the raw materials comprehensively, resulting in uneven mixing of the raw materials and affecting the mixing effect of the device.

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

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

[0006] A raw material premixing device for polyurethane foam boards includes a premixing tank. The premixing tank is a cylindrical shell, and the inner wall of the premixing tank is provided with spiral blades. A plurality of feed ports are opened on the side of the upper part of the premixing tank, and a discharge port is opened at the bottom of the premixing tank. A first valve is arranged at the feed port, and a second valve is arranged at the discharge port; a piston chamber is arranged at the top of the premixing tank, the piston chamber is communicated with the premixing tank, a reciprocating telescopic mechanism is installed on the upper side of the piston chamber, a piston is slidably installed in the piston chamber, and the piston is connected with the reciprocating telescopic mechanism.

[0007] Further, the reciprocating telescopic mechanism includes a mounting plate, a driving motor and a linear bearing are installed on the mounting plate, a crank is fixed to the output shaft of the driving motor, a telescopic rod is slidably installed on the linear bearing, one end of the telescopic rod is connected with the crank through a connecting rod, both ends of the connecting rod are hinged to the crank and the telescopic rod respectively, and the other end of the telescopic rod is fixedly connected with the piston.

[0008] Further, a heating jacket is arranged on the outer side of the premixing tank.

[0009] Further, the first valve is a one-way valve, and the one-way valve conducts unidirectionally into the premixing tank.

[0010] Further, the spiral blade includes a first spiral blade and a second spiral blade. The spiral directions of the first spiral blade and the second spiral blade are opposite, and the first spiral blade and the second spiral blade are arranged alternately along the length direction of the premixing tank.

[0011] The technical solution provided by the embodiment of the present application has at least the following technical effects or advantages:

[0012] By the upward movement of the piston, the raw materials are pumped into the premixing tank, and by the downward pressure of the piston, different raw materials are mixed along the spiral blade and extruded from the lower end of the premixing tank, realizing the full mixing of the raw materials, improving the uniformity of the raw material mixing, and ensuring the quality of the product. Description of the Drawings

[0013] The accompanying drawings forming a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation to the present utility model.

[0014] Figure 1 It is a perspective view of the embodiment of the present application;

[0015] Figure 2 It is a cross-sectional view of the embodiment of the present application;

[0016] Figure 3 It is a schematic structural view of the piston and the reciprocating telescopic mechanism of the embodiment of the present application.

[0017] Reference numerals in the drawings: 1, premixing tank; 11, feed inlet; 12, discharge outlet; 13, heating jacket; 2, reciprocating telescopic mechanism; 21, mounting plate; 22, driving motor; 23, crank; 24, linear bearing; 25, telescopic rod; 26, connecting rod; 3, spiral blade; 31, first spiral blade; 32, second spiral blade; 4, piston. Detailed Embodiments

[0018] In order 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 embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way constitutes a limitation to the present utility model and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0019] Such as Figures 1-3A polyurethane foam board raw material premixing device shown in the figure includes a premixing tank 1 and a reciprocating telescopic mechanism 2. The premixing tank 1 is a vertically installed cylindrical shell, and a spiral blade 3 is installed on the inner wall of the premixing tank 1. The spiral blade 3 includes a first spiral blade 31 and a second spiral blade 32. The rotation directions of the first spiral blade 31 and the second spiral blade 32 are opposite, and the first spiral blade 31 and the second spiral blade 32 are staggered along the length direction of the premixing tank 1, so as to ensure that the raw materials can be fully mixed.

[0020] As Figure 1 , Figure 2 shown, a plurality of feed ports 11 are provided on the side of the upper part of the premixing tank 1. A first valve (not shown) is installed at the feed port 11. Different feed ports 11 are connected to different raw materials through pipelines for injecting raw materials into the premixing tank 1. Preferably, the first valve is a one-way valve, and the one-way valve conducts unidirectionally into the premixing tank 1.

[0021] As Figure 1 , Figure 2 shown, the bottom of the premixing tank 1 is an inverted conical structure. A discharge port 12 is provided at the bottom of the premixing tank 1. A second valve (not shown) is installed at the discharge port 12, and the second valve is a solenoid valve. The outside of the premixing tank 1 is also wrapped with a heating jacket 13, and the heating jacket 13 is used to heat the premixing tank 1 to reduce the viscosity of the raw materials.

[0022] As Figure 2 , Figure 3 shown, a piston cavity is left inside the top of the premixing tank 1, and a piston 4 is slidably installed in the piston cavity. The reciprocating telescopic mechanism 2 is fixedly installed on the top of the premixing tank 1. The reciprocating telescopic mechanism 3 is connected to the piston 4 and is used to drive the piston 4 to reciprocate up and down along the piston cavity.

[0023] As Figure 3 shown, the reciprocating telescopic mechanism 2 includes a mounting plate 21. A driving motor 22 is fixedly installed on the back of the mounting plate 21. The output shaft of the driving motor 22 passes through the mounting plate 21 to the front of the mounting plate 21 and is connected to a crank 23. A linear bearing 24 is fixedly installed on the front of the mounting plate 21. A telescopic rod 25 is slidably installed in the linear bearing 24. The telescopic rod 25 is connected to the free end of the crank 23 through a connecting rod 26. The piston 4 is fixed at one end of the telescopic rod 25 away from the crank 23. Among them, both ends of the connecting rod 26 are hinged to the crank 23 and the telescopic rod 25 respectively. The rotation of the driving motor 22 drives the crank 23 to swing, and drives the telescopic rod 25 to reciprocate along the linear bearing 24 through the connecting rod 26, so as to drive the piston 4 to reciprocate in the piston cavity.

[0024] The working principle of the embodiment of the present application is:

[0025] First, close the second valve and inject raw materials into the premixing tank 1 through the feed inlet. The raw materials flow downward along the spiral blade 3 and are mixed, thus making the piston chamber in a sealed state.

[0026] Then, open the second valve and the reciprocating telescopic mechanism 2. When the reciprocating telescopic mechanism 2 drives the piston 4 to move downward, the one-way valve at the feed inlet 11 closes. The piston 4 squeezes and mixes the raw materials downward and discharges them through the discharge port 12. When the reciprocating telescopic mechanism 2 drives the piston 4 to move upward, the negative pressure in the premixing tank 1 opens the one-way valve at the feed inlet 11 to achieve feeding.

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

[0028] The raw materials are drawn into the premixing tank by the upward movement of the piston, and different raw materials are mixed along the spiral blade and extruded from the lower end of the premixing tank by the downward pressure of the piston, achieving full mixing of the raw materials, improving the uniformity of raw material mixing, and ensuring the quality of the product.

[0029] In addition, it should be noted that using words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Without additional declaration, the above words have no special meaning, so it cannot be understood as a limitation on the protection scope of the present invention.

[0030] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A premixing device for polyurethane foam board raw materials, characterized in that, It includes a premixing tank, the premixing tank is a cylindrical shell, the inner wall of the premixing tank is provided with spiral blades, several feed ports are arranged on the side of the upper part of the premixing tank, a discharge port is arranged at the bottom of the premixing tank, a first valve is arranged at the feed port, and a second valve is arranged at the discharge port; a piston chamber is arranged at the top of the premixing tank, the piston chamber is communicated with the premixing tank, a reciprocating telescopic mechanism is installed on the upper side of the piston chamber, a piston is slidably installed in the piston chamber, and the piston is connected with the reciprocating telescopic mechanism.

2. The premixing device for raw materials of a polyurethane foam board according to claim 1, characterized in that The reciprocating telescopic mechanism includes a mounting plate, a driving motor and a linear bearing are installed on the mounting plate, a crank is fixed on the output shaft of the driving motor, a telescopic rod is slidably installed on the linear bearing, one end of the telescopic rod is connected with the crank through a connecting rod, both ends of the connecting rod are respectively hinged with the crank and the telescopic rod, and the other end of the telescopic rod is fixedly connected with the piston.

3. A premixing device for raw materials of a polyurethane foam board according to claim 1, characterized in that, A heating jacket is arranged on the outside of the premixing tank.

4. A premixing device for polyurethane foam board raw materials according to claim 1, characterized in that The first valve is a one-way valve, and the one-way valve conducts unidirectionally into the premixing tank.

5. A premixing device for raw materials of a polyurethane foam board according to claim 1, characterized in that, The spiral blades include a first spiral blade and a second spiral blade, the rotation directions of the first spiral blade and the second spiral blade are opposite, and the first spiral blade and the second spiral blade are arranged alternately along the length direction of the premixing tank.

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