Leak-proof polyurethane raw material storage tank

Abstract

The utility model discloses a kind of anti-leakage polyurethane raw material storage tanks, including tank body, constant temperature mechanism is provided in the tank body, the tank body top is provided with dry gas inlet, dry gas inlet is provided with dry gas pipe on, the tank body top center is provided with feed inlet, the feed inlet upper portion is provided with feed pipe, the feed pipe top outer side is provided with cooling anti-leakage mechanism, the tank body bottom sidewall is provided with discharge outlet, the tank body outer side is provided with fixed support;By installing annular cooling pipe, annular cooling pipe is connected with cooling liquid tank, continuously cooling the outer side of feed pipe, form a low-temperature area, when the steam generated by polyurethane in storage tank under high temperature leaks, due to the crystallization characteristics of MDI in polyurethane under low temperature, steam passes through the outer side low-temperature area of feed pipe and rapidly crystallizes, fall into lower crystallization collection tank, to prevent polyurethane raw material leakage.

Description

Technical Field

[0001] This utility model relates to the field of polyurethane storage technology, specifically to a leak-proof polyurethane raw material storage tank. Background Technology

[0002] Thermoplastic TPU elastomer is made by extrusion compounding of MDI containing NCO functional groups and POLYOL and 1,4BG containing OH functional groups. Due to its good elasticity, excellent physical properties, and good mechanical strength, it is widely used in injection molding, extrusion, calendering, and solution-type resin processing. It is a commonly used plastic material in the plastics processing industry, and its products cover a wide range of industrial applications and consumer necessities.

[0003] TPU (thermoplastic polyurethane) is a linear polymer made by block copolymerization of macromolecular polyols, diisocyanates, and small molecule chain extenders. During storage, the temperature must be precisely controlled between 40 and 50°C. This temperature range is a balance point: it is higher than the crystallization point to prevent crystallization, and much lower than the self-polymerization temperature to ensure safety. However, at this temperature, the MDI in the polyurethane is heated and melted into a liquid, and the volatility and vapor pressure will increase significantly, which may lead to leakage during long-term storage. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a leak-proof polyurethane raw material storage tank to solve the problem of MDI vapor leakage hazarding workers' health mentioned in the background art.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a leak-proof polyurethane raw material storage tank, comprising a tank body, a constant temperature mechanism provided inside the tank body, a dry gas inlet provided at the top of the tank body, a dry gas inlet pipe provided on the dry gas inlet, a feed inlet provided at the center of the top of the tank body, a feed pipe provided above the feed inlet, a cooling and leak-proof mechanism provided on the outer side of the top of the feed pipe, a discharge outlet provided on the bottom side wall of the tank body, and a fixed support provided on the outer side of the tank body;

[0008] The cooling and leak-proof mechanism includes an annular cooling pipe, a cooling pipe support, a crystallization collection tank, and an external cooling connector. The cooling pipe support is fixed to the top of the tank and surrounds the feed pipe. An annular cooling pipe is fixed on the cooling pipe support, and an external cooling connector is provided on the annular cooling pipe. The external cooling connector is connected to an external cooling device.

[0009] As a preferred embodiment of this invention, the feed pipe is wrapped with a heat insulation layer, and a sealing cap is provided at the top of the feed pipe.

[0010] In a preferred embodiment of this invention, the constant temperature mechanism includes a constant temperature heating pipe, an electric heating element, a temperature sensor, a heating power supply, a PLC controller, a circulating pump, and a circulating water tank. The circulating water tank is fixed to one side of the tank body. The heating power supply and the PLC controller are fixed on the circulating water tank. The PLC controller is electrically connected to the heating power supply. An electric heating element is installed inside the circulating water tank and connected to the heating power supply. A temperature sensor is fixed inside the circulating water tank and electrically connected to the PLC controller. The constant temperature heating pipe is installed inside the side wall of the tank body and connected to the circulating water tank. A circulating pump is installed on the constant temperature heating pipe.

[0011] As a preferred embodiment of this invention, a one-way inlet valve is provided inside the inlet of the drying gas.

[0012] As a preferred embodiment of this utility model, a stirring mechanism is provided at the bottom of the tank, the stirring mechanism including a stirring motor, a stirring main shaft, and stirring blades; the stirring motor is fixed at the bottom of the tank, the output end of the stirring motor is fixedly connected to the stirring main shaft, and stirring blades are fixed on the stirring main shaft.

[0013] As a preferred embodiment of this utility model, the bottom of the tank is designed as a circular arc-shaped bottom surface with a convex center and a low periphery. The stirring shaft is rotatably fixed at the convex center of the circular arc-shaped bottom surface, and the discharge port is located on the side wall of the tank above the convex center of the circular arc-shaped bottom surface.

[0014] As a preferred embodiment of this utility model, a discharge pipe is fixed on the discharge port, and a discharge valve is provided on the discharge pipe.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] 1. This utility model uses an annular cooling pipe connected to a coolant tank to continuously cool the outside of the feed pipe, creating a low-temperature zone. When the polyurethane vapor generated at high temperature leaks from the storage tank, the MDI in the polyurethane crystallizes rapidly as it passes through the low-temperature zone outside the feed pipe due to its low-temperature properties, and falls into the crystallization collection tank below, preventing the vapor from evaporating and affecting the health of the workers.

[0017] 2. By opening the discharge port above the central convex part of the arc-shaped bottom surface, this utility model avoids the situation where a small amount of crystallization occurs during the storage of polyurethane raw materials, which can cause pipe blockage due to discharge. The bottom of the tank is designed as an arc-shaped bottom surface with a convex center and low edges. When crystallization occurs, the crystals roll down to the edges of the bottom surface along with the arc-shaped bottom surface, while the discharge port is located at a higher position, thus avoiding the situation where crystals are mixed with the raw materials and block the discharge pipe during discharge. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the appearance and structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the overall planar structure of this utility model;

[0020] Figure 3 This is a top view schematic diagram of the cooling and leak prevention mechanism of this utility model;

[0021] Figure 4 This is a schematic diagram of the planar structure of the constant temperature mechanism of this utility model.

[0022] In the diagram: 1. Tank body; 2. Thermostatic mechanism; 201. Thermostatic heating pipe; 202. Electric heating tube; 203. Temperature sensor; 204. Heating power supply; 205. PLC controller; 206. Circulating pump; 207. Circulating water tank; 3. Drying gas inlet; 4. Drying gas inlet pipe; 5. Feed inlet; 6. Feed pipe; 601. Insulation layer; 602. Sealing cover; 7. Cooling and leak-proof mechanism; 701. Annular cooling pipe; 702. Cooling pipe support; 703. Crystallization collection tank; 704. External cooling connector; 8. Discharge port; 9. Fixed bracket; 10. One-way air inlet valve; 11. Stirring mechanism; 1101. Stirring motor; 1102. Stirring main shaft; 1103. Stirring fan blade; 12. Arc-shaped bottom surface; 13. Discharge pipe; 14. Discharge valve. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] like Figures 1 to 4As shown, this utility model provides a leak-proof polyurethane raw material storage tank, including a tank body 1, a constant temperature mechanism 2 inside the tank body 1, a dry gas inlet 3 at the top of the tank body 1, a dry gas inlet pipe 4 on the dry gas inlet 3, a feed inlet 5 at the center of the top of the tank body 1, a feed pipe 6 above the feed inlet 5, a cooling and leak-proof mechanism 7 on the outer side of the top of the feed pipe 5, a discharge port 8 on the bottom side wall of the tank body 1, and a fixed bracket 9 on the outer side of the tank body 1.

[0025] refer to Figure 2-3 The cooling and leak prevention mechanism 7 includes an annular cooling pipe 701, a cooling pipe support 702, a crystallization collection tank 703, and an external cooling connector 704. The cooling pipe support 702 is fixed to the top of the tank 1 and surrounds the feed pipe 6. The annular cooling pipe 701 is fixed on the cooling pipe support 702. The external cooling connector 704 is provided on the annular cooling pipe 701 and is connected to an external cooling device. The feed pipe 6 is wrapped with a heat insulation layer 601, and a sealing cap 602 is provided on the top of the feed pipe 6.

[0026] By installing an annular cooling pipe 701, which is connected to a coolant tank, the outside of the feed pipe 6 is continuously cooled to form a low-temperature zone. When the polyurethane vapor generated at high temperature leaks from the storage tank, due to the characteristic that MDI in the polyurethane crystallizes at low temperature, the vapor crystallizes rapidly when it passes through the low-temperature zone outside the feed pipe 6 and falls into the crystallization collection tank 703 below, preventing the vapor from evaporating and affecting the health of the staff.

[0027] refer to Figure 2 The bottom of the tank body 1 is designed as a rounded bottom surface 12 with a convex center and a low perimeter. The stirring shaft 1102 is rotatably fixed at the convex center of the rounded bottom surface 12. The discharge port 5 is located on the side wall of the tank body 1 above the convex center of the rounded bottom surface 12.

[0028] By opening the discharge port 5 above the central convex part of the arc-shaped bottom surface 12, a small amount of crystallization may still occur during the storage of polyurethane raw materials, causing blockage of the pipeline due to discharge. The bottom of the tank body 1 is designed as an arc-shaped bottom surface 12 with a convex center and low edges. When crystallization occurs, the crystals roll down to the edges of the bottom surface with the arc-shaped bottom surface 12, while the discharge port 5 is located at a higher position, avoiding the situation where crystals are mixed in with the raw materials and block the discharge pipe 13 during discharge.

[0029] How to use

[0030] The working principle and usage process of this utility model are as follows: Polyurethane raw materials are stored in tank 1. The electric heating element 202 heats the circulating water in the vertical circulation 207, setting the circulating water temperature to 40-50°C. When the temperature sensor 203 detects that the circulating water temperature has reached 50°C, it sends a feedback signal to the PLC controller 205. The PLC controller 205 then controls the heating power supply 204 to stop supplying power to the electric heating element 202, maintaining the circulating water temperature below 50°C. When the circulating water temperature is below 40°C, the PLC controller 205 controls the heating power supply 204 to start supplying power to the electric heating element 202 for heating. The circulating water enters the constant temperature heating pipe 201 via the circulation pump 206, maintaining the temperature inside tank 1 at 40-50°C, suitable for storing polyurethane raw materials. The annular cooling pipe 701 is connected to a coolant tank, continuously cooling the outside of the feed pipe 6, forming a low-temperature zone for storage. When the polyurethane vapor generated at high temperature leaks from the storage tank, due to the characteristic that MDI in the polyurethane crystallizes at low temperature, the vapor crystallizes rapidly when it passes through the low-temperature area outside the feed pipe 6 and falls into the crystallization collection tank 703 below. The stirring motor 1101 continuously outputs and drives the stirring fan blade 1103 to continuously rotate, so that the polyurethane raw material in the tank 1 keeps moving slowly at a low speed to prevent crystallization due to long-term stillness and cooling. If crystallization occurs, the crystals roll down to the perimeter of the bottom surface with the arc-shaped bottom surface 12. The discharge port 5 is located at a higher position, which avoids the situation where crystals are mixed in with the raw material and block the discharge pipe 13 during discharge. When the temperature in the tank 1 is maintained at 40-50°C, the crystals will slowly melt. When the raw material is not being discharged, the stirring fan blade 1103 stirs slightly to help the melted part mix with the unmelted part, promote heat transfer, reduce crystal accumulation, and reduce raw material loss.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A leak-proof polyurethane raw material storage tank, comprising a tank body (1), characterized in that: The tank (1) is equipped with a constant temperature mechanism (2), the top of the tank (1) is equipped with a dry gas inlet (3), the dry gas inlet (3) is equipped with a dry gas pipe (4), the center of the top of the tank (1) is provided with a feed inlet (5), the feed inlet (5) is provided with a feed pipe (6) above the feed inlet (5), the outer side of the top of the feed pipe (6) is provided with a cooling and leak prevention mechanism (7), the bottom side wall of the tank (1) is provided with a discharge port (8), and the outer side of the tank (1) is provided with a fixed bracket (9). The cooling and leak prevention mechanism (7) includes an annular cooling pipe (701), a cooling pipe support (702), a crystallization collection tank (703), and an external cooling connector (704). The cooling pipe support (702) is fixed on the top of the tank (1) and surrounds the feed pipe (6). An annular cooling pipe (701) is fixed on the cooling pipe support (702). An external cooling connector (704) is provided on the annular cooling pipe (701). The external cooling connector (704) is connected to an external cooling device.

2. The leak-proof polyurethane raw material storage tank according to claim 1, characterized in that: The feed pipe (6) is wrapped with a heat insulation layer (601), and a sealing cap (602) is provided on the top of the feed pipe (6).

3. The leak-proof polyurethane raw material storage tank according to claim 1, characterized in that: The constant temperature mechanism (2) includes a constant temperature heating pipe (201), an electric heating tube (202), a temperature sensor (203), a heating power supply (204), a PLC controller (205), a circulating pump (206), and a circulating water tank (207). The circulating water tank (207) is fixed to one side of the tank body (1). The heating power supply (204) and the PLC controller (205) are fixed on the circulating water tank (207). The PLC controller (205) is electrically connected to the heating power supply (204). An electric heating tube (202) is installed inside the water tank (207). The electric heating tube (202) is connected to the heating power supply (204). A temperature sensor (203) is fixed inside the circulating water tank (207). The temperature sensor (203) is electrically connected to the PLC controller (205). The constant temperature heating pipe (201) is installed inside the side wall of the tank body (1). The constant temperature heating pipe (201) is connected to the circulating water tank (207). A circulating pump (206) is installed on the constant temperature heating pipe (201).

4. The leak-proof polyurethane raw material storage tank according to claim 1, characterized in that: A one-way inlet valve (10) is provided inside the dry gas inlet (3).

5. The leak-proof polyurethane raw material storage tank according to claim 1, characterized in that: The bottom of the tank (1) is provided with a stirring mechanism (11), which includes a stirring motor (1101), a stirring main shaft (1102), and stirring blades (1103). The stirring motor (1101) is fixed at the bottom of the tank (1), and the output end of the stirring motor (1101) is fixedly connected to the stirring main shaft (1102). The stirring blades (1103) are fixed on the stirring main shaft (1102).

6. The leak-proof polyurethane raw material storage tank according to claim 5, characterized in that: The bottom of the tank (1) is designed as a circular arc-shaped bottom surface (12) with a convex center and a low periphery. The stirring spindle (1102) is rotatably fixed at the convex center of the circular arc-shaped bottom surface (12). The discharge port (8) is located on the side wall of the tank (1) above the convex center of the circular arc-shaped bottom surface (12).

7. The leak-proof polyurethane raw material storage tank according to claim 1, characterized in that: A discharge pipe (13) is fixed on the discharge port (8), and a discharge valve (14) is provided on the discharge pipe (13).

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