Raw material mixing equipment for preparing polyurethane foam plastic

Abstract

The utility model provides raw material mixing equipment for preparing polyurethane foam plastic, which belongs to the field of foam plastic raw material mixing, and comprises a mixing tank and a blanking pipe arranged at the bottom of the mixing tank, and two groups of feeding pipes are arranged at the top of the mixing tank in a penetrating and communicating manner; the multi-layer stirring mechanism is arranged in the mixing tank, the rotating directions of the upper layer and the lower layer of the multi-layer stirring mechanism are opposite, and the multi-layer stirring mechanism can enhance shearing force and convection and guarantee the raw material mixing effect. And the rotation directions of the two are opposite to form high-strength shearing force and convection, so that the raw materials can be fully stirred, layering of the mixed materials is prevented, and the mixing effect is improved.

Description

Technical Field

[0001] This utility model relates to the field of mixing raw materials for foamed plastics, and more specifically, to a raw material mixing device for preparing polyurethane foamed plastics. Background Technology

[0002] Polyurethane foam is made by polymerizing and foaming isocyanates and hydroxyl compounds. Based on its hardness, it can be divided into two categories: flexible and rigid, with flexible being the main type. Generally speaking, it has excellent elasticity, flexibility, elongation, and compressive strength.

[0003] Currently, the production of polyurethane foam requires the use of raw material mixing equipment. Most of these equipment uses a single paddle for mixing, and the mixing range is fixed, which can easily lead to material stratification and uneven mixing, affecting the physical properties of the final product. Furthermore, it is difficult to remove residues from the tank walls, resulting in material waste. How to invent a raw material mixing equipment for the preparation of polyurethane foam to improve these problems has become an urgent issue for those skilled in the art. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a raw material mixing device for the preparation of polyurethane foam, which aims to improve the current situation where most mixing is carried out using a single blade with a fixed stirring range, which easily leads to material stratification, uneven mixing, and a decline in the physical properties of the final product.

[0005] This utility model is implemented as follows:

[0006] This utility model provides a raw material mixing device for the preparation of polyurethane foam, including a mixing tank and a feeding pipe provided at the bottom of the mixing tank. Two sets of feeding pipes are provided through the top of the mixing tank. It also includes a multi-layer stirring mechanism: the multi-layer stirring mechanism is located inside the mixing tank, and the upper and lower layers of the multi-layer stirring mechanism rotate in opposite directions. The multi-layer stirring mechanism can enhance shear force and convection, and ensure the mixing effect of raw materials.

[0007] Preferably, the multi-layer stirring mechanism includes a sleeve disposed inside a mixing tank. The sleeve is rotatably connected to the top of the mixing tank. A second stirring rod is movably inserted through the top of the sleeve. A second bevel gear is sleeved on the outer wall of the second stirring rod. A first bevel gear is sleeved on the outer wall of the sleeve. A mounting frame is disposed at the top of the mixing tank. One end of the second stirring rod is connected to a bearing disposed at the top of the mounting frame. A motor is disposed on the inner side wall of the mounting frame. A drive bevel gear that meshes with the first and second bevel gears is connected to the output end of the motor. A worm gear blade is sleeved on the outer wall of the sleeve. A liftable first stirring rod is rotatably connected inside the sleeve. A spiral blade is sleeved on the outer wall of the first stirring rod.

[0008] Preferably, the bottom of the second stirring rod is provided with an electric telescopic rod, one end of which is connected to one end of the first stirring rod.

[0009] Preferably, the top of the mixing tank is provided with a through hole, and a bearing is sleeved on the outer wall of the sleeve, the bearing cooperating with the inner wall of the through hole.

[0010] Preferably, the inner sidewall of the mixing tank is provided with two sets of scrapers, and each set of scrapers is provided with a connecting rod on its sidewall, one end of which is connected to the sidewall of the sleeve.

[0011] Preferably, the mixing tank is conical in shape with an inclination of 65 degrees.

[0012] The beneficial effects of this utility model are:

[0013] 1. This utility model uses a multi-layered stirring mechanism, employing a combination of spiral blades and worm gear blades, with the two rotating in opposite directions, to generate high-intensity shear force and convection, thereby fully stirring the raw materials, preventing stratification of the materials, and improving the mixing effect;

[0014] 2. This utility model incorporates an electric telescopic rod, which can drive the second stirring rod to rise and fall, thereby driving the spiral blades to rise and fall. The spiral blades generate turbulence in the vertical direction, which, together with the horizontal rotation of the worm gear blades, generates centrifugal force. The two work together to enhance axial and radial convection, completely breaking down the stratification of the raw materials. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a utility model Figure 1 Enlarged view of the structure at point A in the middle;

[0018] Figure 3 This is a schematic diagram of the internal structure of the sleeve of this utility model.

[0019] In the diagram: 1. Mixing tank; 2. Feed pipe; 3. Multi-layer mixing mechanism; 300. First mixing rod; 301. Spiral blade; 302. Worm gear blade; 303. Sleeve; 304. Second mixing rod; 305. Mounting bracket; 306. Second bevel gear; 307. First bevel gear; 308. Drive bevel gear; 309. Motor; 310. Electric telescopic rod; 4. Feed pipe; 5. Connecting rod; 6. Scraper. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0021] Example, refer to Figures 1-3 A raw material mixing device for preparing polyurethane foam includes a mixing tank 1 and a discharge pipe 2 disposed at the bottom of the mixing tank 1. Two sets of feed pipes 4 are connected through the top of the mixing tank 1. The device also includes a multi-layer stirring mechanism 3: the multi-layer stirring mechanism 3 is disposed inside the mixing tank 1, and the upper and lower layers of the multi-layer stirring mechanism 3 rotate in opposite directions. The multi-layer stirring mechanism 3 can enhance shear force and convection, and ensure the mixing effect of raw materials.

[0022] The multi-layer stirring mechanism 3 includes a sleeve 303 installed inside the mixing tank 1. The sleeve 303 is rotatably connected to the top of the mixing tank 1. A second stirring rod 304 is movably inserted through the top of the sleeve 303. A second bevel gear 306 is sleeved on the outer wall of the second stirring rod 304. A first bevel gear 307 is sleeved on the outer wall of the sleeve 303. A mounting bracket 305 is installed on the top of the mixing tank 1. One end of the second stirring rod 304 is connected to a bearing installed on the top of the mounting bracket 305. A motor 309 is installed on the inner side wall of the mounting bracket 305. The output end of the motor 309 is connected to... There is a driving bevel gear 308 that meshes with the first bevel gear 307 and the second bevel gear 306. A worm gear blade 302 is sleeved on the outer wall of the sleeve 303. A through hole is opened at the top of the mixing tank 1. A bearing is sleeved on the outer wall of the sleeve 303. The bearing cooperates with the inner wall of the through hole. Under the action of the bearing, the rotation of the sleeve 303 is more stable, thereby driving the worm gear blade 302 to stir more stably. A liftable first stirring rod 300 is rotatably connected inside the sleeve 303. A spiral blade 301 is sleeved on the outer wall of the first stirring rod 300.

[0023] It should be noted that the spiral blade 301 and the worm gear blade 302 rotate in opposite directions. The spiral blade 301, the worm gear blade 302 and the stirring rod are all made of 304 stainless steel, which is corrosion resistant.

[0024] The bottom of the second stirring rod 304 is provided with an electric telescopic rod 310, one end of which is connected to one end of the first stirring rod 300.

[0025] It should be noted that the electric telescopic rod 310 drives the first stirring rod 300 to rise and fall, which can adjust the stirring depth of the spiral blade 301.

[0026] The inner wall of the mixing tank 1 is provided with two sets of scrapers 6, and each set of scrapers 6 is provided with a connecting rod 5. One end of the connecting rod 5 is connected to the side wall of the sleeve 303.

[0027] It should be noted that the connecting rod 5 is linked with the sleeve 303, so that when the sleeve 303 rotates, the connecting rod 5 can drive the scraper 6 to rotate, scraping off the residue on the tank wall in real time to prevent residue. The scraper 6 is made of polytetrafluoroethylene to reduce frictional wear.

[0028] The mixing tank 1 is set in a conical shape with an inclination of 65 degrees.

[0029] It should be noted that the inclined mixing tank 1, combined with the centrifugal action of the worm gear blade 302 and the spiral blade 301, guides the raw materials to converge towards the center, avoids edge deposition, and improves the mixing effect. After mixing is completed, the discharge pipe 2 is opened, and the conical mixing tank 1 can accelerate the discharge of materials.

[0030] Working principle: Raw materials are injected into mixing tank 1 through feed pipe 4. Motor 309 is started, and active bevel gear 308 drives first bevel gear 307 and second bevel gear 306 to rotate. First bevel gear 307 drives sleeve 303 and worm gear blade 302 to rotate clockwise, and second bevel gear 306 drives second stirring rod 304 and spiral blade 301 to rotate counterclockwise. Electric telescopic rod 310 drives spiral blade 301 to rise and fall, forming turbulence in the vertical direction. The horizontal rotation of worm gear blade 302 generates centrifugal force. The two work together to enhance axial and radial convection, completely breaking up the stratification of raw materials. Scraper 6 rotates with sleeve 303, which can scrape off the adhering material on the tank wall to prevent residue. After mixing is completed, feed pipe 2 is opened, and the conical tank accelerates the discharge of materials.

[0031] It should be noted that the specific model and specifications of the motor need to be selected and determined based on the actual specifications of the device. The specific selection and calculation method adopts the existing technology in this field, so it will not be described in detail here.

[0032] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A raw material mixing device for preparing polyurethane foam, comprising a mixing tank (1) and a feed pipe (2) disposed at the bottom of the mixing tank (1), wherein two sets of feed pipes (4) are provided through and connected to the top of the mixing tank (1), characterized in that, Also includes: Multi-layer stirring mechanism (3): The multi-layer stirring mechanism (3) is set inside the mixing tank (1), and the upper and lower layers of the multi-layer stirring mechanism (3) rotate in opposite directions. The multi-layer stirring mechanism (3) can enhance shear force and convection, and ensure the mixing effect of raw materials.

2. The raw material mixing equipment for preparing polyurethane foam according to claim 1, characterized in that, The multi-layer stirring mechanism (3) includes a sleeve (303) provided inside the mixing tank (1). The sleeve (303) is rotatably connected to the top of the mixing tank (1). A second stirring rod (304) is movably inserted through the top of the sleeve (303). A second bevel gear (306) is sleeved on the outer wall of the second stirring rod (304). A first bevel gear (307) is sleeved on the outer wall of the sleeve (303). A mounting bracket (305) is provided on the top of the mixing tank (1). One end of the second stirring rod (304) is connected to the mounting bracket. (305) is connected to the bearing at the top of the inner part. The inner side wall of the mounting bracket (305) is provided with a motor (309). The output end of the motor (309) is connected to an active bevel gear (308) that meshes with the first bevel gear (307) and the second bevel gear (306). The outer wall of the sleeve (303) is fitted with a worm gear blade (302). The sleeve (303) is rotatably connected to a liftable first stirring rod (300). The outer wall of the first stirring rod (300) is fitted with a spiral blade (301).

3. The raw material mixing equipment for preparing polyurethane foam according to claim 2, characterized in that, The bottom of the second stirring rod (304) is provided with an electric telescopic rod (310), one end of which is connected to one end of the first stirring rod (300).

4. The raw material mixing equipment for preparing polyurethane foam according to claim 2, characterized in that, The mixing tank (1) has a through hole at the top, and a bearing is installed on the outer wall of the sleeve (303), which cooperates with the inner wall of the through hole.

5. The raw material mixing equipment for preparing polyurethane foam according to claim 1, characterized in that, The mixing tank (1) has two sets of scrapers (6) on its inner side wall. Both sets of scrapers (6) have connecting rods (5) on their side walls. One end of the connecting rod (5) is connected to the side wall of the sleeve (303).

6. The raw material mixing equipment for preparing polyurethane foam according to claim 1, characterized in that, The mixing tank (1) is conical in shape with an inclination of 65 degrees.

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