A polyurethane pulverizing, heating, and mixing device

Abstract

This utility model discloses a polyurethane pulverizing, heating, and mixing device, including a mounting frame, a processing and pulverizing mechanism, a pulverizing and screening mechanism, a preheating and mixing mechanism, and a heating and mixing mechanism. The preheating and mixing mechanism is located on top of the mounting frame, the processing and pulverizing mechanism is located on top of the preheating and mixing mechanism, the pulverizing and screening mechanism is located between the processing and pulverizing mechanism and the preheating and mixing mechanism, and the pulverizing and screening mechanism is rotatably connected to the processing and pulverizing mechanism. The heating and mixing mechanism is located beside the preheating and mixing mechanism, and the preheating and mixing mechanisms are connected to each other. This utility model can reduce the viscosity of raw materials, improve mixing efficiency, ensure the uniformity and controllability of chemical reactions, reduce bubbles and defects, and improve product quality.

Description

Technical Field

[0001] This utility model relates to the field of polyurethane processing technology, and in particular to a polyurethane pulverizing, heating and mixing device. Background Technology

[0002] Polyurethane is a high molecular polymer formed by the reaction of polyisocyanates and polyethers or polyester polyols under certain conditions. Stirring and mixing are key steps in its production process, aiming to uniformly mix various raw materials to form a stable reaction system, laying the foundation for subsequent reactions and product quality.

[0003] However, existing equipment does not preheat the raw materials during the polyurethane production mixing process. This leads to low mixing efficiency and prolonged mixing time due to large differences in the viscosity of the raw materials. The reaction initiation is delayed and prone to local overheating, resulting in uneven product performance, defects such as bubbles, increased equipment load, increased energy consumption and scrap rate, seriously affecting production efficiency and quality. Utility Model Content

[0004] The purpose of this invention is to provide a polyurethane pulverizing, heating, and mixing device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A polyurethane pulverizing, heating, and mixing device includes a mounting frame, a processing and pulverizing mechanism, a pulverizing and screening mechanism, a preheating and mixing mechanism, and a heating and mixing mechanism. The preheating and mixing mechanism is located on top of the mounting frame, the processing and pulverizing mechanism is located on top of the preheating and mixing mechanism, the pulverizing and screening mechanism is located between the processing and pulverizing mechanism and the preheating and mixing mechanism, and the pulverizing and screening mechanism is rotatably connected to the processing and pulverizing mechanism. The heating and mixing mechanism is located beside the preheating and mixing mechanism, and the preheating and mixing mechanisms are connected to each other.

[0007] A further technical solution is provided, wherein the processing and crushing mechanism includes a crushing box, a crushing motor, two crushing shafts and two crushing gears. The two crushing shafts are symmetrically rotatably connected inside the crushing box, and the two crushing gears are respectively connected to the two crushing shafts and mesh with each other. The crushing motor is located on the side wall of the crushing box and the main shaft of the crushing motor is drivenly connected to one of the crushing shafts. Both crushing shafts are provided with several crushing blades, and the top of the crushing box is provided with a feed hopper.

[0008] A further technical solution is that the side wall of the feed hopper is provided with several air inlet nozzles, and the several air inlet nozzles are connected by connecting pipes.

[0009] A further technical solution is provided, wherein the crushing and screening mechanism includes a drive motor, a drive shaft, a screening screen, and two drive protrusions. The bottom of the screening screen is provided with four springs, and the bottom of each spring is provided with a mounting plate. The mounting plate is fixedly connected to the inner side wall of the crushing chamber. The screening screen slides up and down inside the crushing chamber. The drive shaft is rotatably connected to the crushing chamber. The drive motor is located outside the crushing chamber and the main shaft of the drive motor is connected to the drive shaft. The two drive protrusions are symmetrically arranged on the drive shaft. The bottom of the screening screen is provided with drive wheels connected to the two drive protrusions.

[0010] A further technical solution is that the preheating and mixing mechanism includes a preheating box, a mixing motor and a mixing rotating frame. The preheating box is located at the bottom of the crushing box, the mixing motor is located at the bottom of the preheating box, the mixing rotating frame is connected to the main shaft of the mixing motor, the mixing rotating frame is located inside the preheating box, the preheating box is provided with a jacket, and an electric heating tube system is provided in the jacket.

[0011] A further technical solution is provided, wherein the heating and mixing mechanism includes a mixing cylinder, a mixing motor, mixing spiral blades, and two supports. The two supports are symmetrically arranged, and the mixing cylinder is horizontally arranged at the bottom of the two supports. The mixing cylinder is connected to the preheating box. The mixing motor is located on the side wall of the mixing cylinder. The mixing spiral blades are drivenly connected to the main shaft of the mixing motor. The mixing spiral blades rotate inside the mixing cylinder. The mixing cylinder is provided with a discharge port. A jacket is provided on the outside of the mixing cylinder. A heat transfer oil circulation system is provided inside the jacket.

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

[0013] In this invention, when preheating pulverized polyurethane raw materials, the electric heating tube system generates heat, which is transferred to the preheating chamber. Then, the mixing motor drives the mixing rotating frame to rotate within the preheating chamber, thus mixing and stirring the raw materials. This breaks up the "thermal stratification" phenomenon, avoiding localized overheating or cold zones. The paddle or spiral structure of the mixing rotating frame simultaneously breaks up raw material clumps, ensuring full contact between the heating medium or hot air and the raw materials. This reduces the viscosity of the raw materials, improves mixing efficiency, ensures uniform and controllable chemical reactions, minimizes bubbles and defects, and improves product quality.

[0014] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0015] Figure 1 : A three-dimensional structural diagram of this utility model.

[0016] Figure 2 Top view of this utility model.

[0017] Figure 3 : A three-dimensional structural diagram of the processing and crushing mechanism of this utility model.

[0018] Figure 4 : A three-dimensional structural diagram of the crushing and screening mechanism of this utility model.

[0019] Figure 5 :for Figure 4 Enlarged view of point A in the middle.

[0020] Figure 6 : A three-dimensional structural diagram of the preheating and mixing mechanism of this utility model.

[0021] Figure 7 : A three-dimensional structural diagram of the heating and mixing mechanism of this utility model.

[0022] Reference numerals: Mounting frame 1, Processing and crushing mechanism 2, Crushing box 20, Crushing motor 21, Crushing shaft 22, Crushing gear 23, Feed hopper 24, Air inlet nozzle 25, Connecting pipe 26, Crushing blade 27, Crushing and screening mechanism 3, Drive motor 31, Drive shaft 32, Screening plate 33, Drive convex plate 34, Drive wheel 36, Spring 37, Mounting plate 38, Preheating and mixing mechanism 4, Preheating box 41, Jacket 411, Mixing motor 42, Mixing rotating frame 43, Electric heating tube system 44, Heating and mixing mechanism 5, Mixing cylinder 51, Mixing motor 52, Mixing spiral blade 53, Support 54, Jacket sleeve 55, Heat transfer oil circulation system 56, Discharge port 57. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0024] Please refer to Figure 1-7 As shown; This utility model provides a technical solution for a polyurethane pulverizing, heating, and mixing device: A polyurethane pulverizing, heating, and mixing device includes a mounting frame 1, a processing and pulverizing mechanism 2, a pulverizing and screening mechanism 3, a preheating and mixing mechanism 4, and a heating and mixing mechanism 5. The preheating and mixing mechanism 4 is located on top of the mounting frame 1. The processing and pulverizing mechanism 2 is located on top of the preheating and mixing mechanism 4. The pulverizing and screening mechanism 3 is located between the processing and pulverizing mechanism 2 and the preheating and mixing mechanism 4, and the pulverizing and screening mechanism 3 is rotatably connected to the processing and pulverizing mechanism 2. The heating and mixing mechanism 5 is located beside the preheating and mixing mechanism 4, and the preheating and mixing mechanism 4 is connected to each other.

[0025] In this implementation, refer to Figure 3As shown, the processing and crushing mechanism 2 includes a crushing box 20, a crushing motor 21, two crushing shafts 22 and two crushing gears 23. The two crushing shafts 22 are symmetrically rotatably connected inside the crushing box 20. The two crushing gears 23 are respectively connected to the two crushing shafts 22 and mesh with each other. The crushing motor 21 is located on the side wall of the crushing box 20 and the main shaft of the crushing motor 21 is connected to one of the crushing shafts 22 for transmission. Both crushing shafts 22 are provided with a plurality of crushing blades 27. The top of the crushing box 20 is provided with a feed hopper 24.

[0026] When pulverizing polyurethane raw materials, the raw materials are conveyed into the pulverizing box 20 through the feed hopper 24. The pulverizing motor 21 drives one of the pulverizing shafts 22 to rotate, which in turn drives the pulverizing gear 23 to rotate, thereby driving the other pulverizing gear 23 to rotate and the other pulverizing shaft 22 to rotate on the pulverizing box 20. The simultaneous rotation of the two pulverizing shafts drives several pulverizing blades 27 to rotate and pulverize the raw materials. The synchronous rotation of the two shafts forms opposing or unidirectional shearing forces, which can quickly tear and cut the raw materials. The multiple sets of pulverizing blades 27 move in an alternating manner, so that the raw materials are repeatedly sheared between the two shafts. The particle size distribution of the pulverized particles is more concentrated, reducing the residue of coarse particles and facilitating the uniformity of subsequent mixing.

[0027] In this implementation, refer to Figure 3 As shown, the side wall of the feed hopper 24 is provided with a plurality of air inlet nozzles 25, and the plurality of air inlet nozzles 25 are connected by connecting pipes 26.

[0028] When pulverizing polyurethane, a small amount of inert gas, such as nitrogen, is delivered into the pulverizing chamber 20 through the connecting pipe 26 and several air inlet nozzles 25 to prevent the raw material from oxidizing or accumulating static electricity.

[0029] In this implementation, refer to Figure 4 and Figure 5 As shown, the crushing and screening mechanism 3 includes a drive motor 31, a drive shaft 32, a screening screen 33, and two drive protrusions 34. The bottom of the screening screen 33 is provided with four springs 37, and the bottom of each spring 37 is provided with a mounting plate 38. The mounting plate 38 is fixedly connected to the inner side wall of the crushing box 20. The screening screen 33 slides up and down inside the crushing box 20. The drive shaft 32 is rotatably connected to the crushing box 20. The drive motor 31 is located outside the crushing box 20, and the main shaft of the drive motor 31 is connected to the drive shaft 32. The two drive protrusions 34 are symmetrically arranged on the drive shaft 32. The bottom of the screening screen 33 is provided with drive wheels 36 connected to the two drive protrusions 34.

[0030] After the raw materials are crushed, they can be screened. At this time, the drive motor 31 drives the drive shaft 32 to rotate on the crushing box 20, thereby driving the two drive convex plates 34 to strike the two drive wheels 36. This causes the screening screen 33 to vibrate up and down on the four mounting plates 38 through the four springs 37, thus screening the crushed raw materials. This can remove unqualified particles and avoid large pieces of raw materials from overheating the outer layer and failing to melt the core due to uneven heat transfer during preheating, or from dust and measurement deviation caused by excessive fine powder. Different products have different sensitivities to raw material particle size (e.g., soft foam requires 2~4mm particles, and rigid boards require 1~2mm particles). Screening can accurately match the dispersion efficiency and reaction contact area during mixing.

[0031] In this implementation, refer to Figure 6 As shown, the preheating and mixing mechanism 4 includes a preheating box 41, a mixing motor 42, and a mixing rotating frame 43. The preheating box 41 is located at the bottom of the crushing box 20, the mixing motor 42 is located at the bottom of the preheating box 41, and the mixing rotating frame 43 is connected to the main shaft of the mixing motor 42. The mixing rotating frame 43 is located inside the preheating box 41. The preheating box 41 is provided with a jacket 411, and an electric heating tube system 44 is provided inside the jacket 411.

[0032] When preheating the pulverized polyurethane raw materials, the electric heating tube system 44 generates heat, which is transferred to the preheating box 41. Then, the mixing motor 42 drives the mixing rotating frame 43 to rotate inside the preheating box 41, which can mix and stir the raw materials in the preheating box 41, breaking the "thermal stratification" phenomenon and avoiding local overheating or cold areas. The paddle or spiral structure of the mixing rotating frame 43 can simultaneously break up the raw material clumps, so that the heating medium or hot air can fully contact the raw materials.

[0033] Preheating the raw materials during the polyurethane production mixing process can first reduce the viscosity of the raw materials; secondly, it can ensure the uniformity of the reaction, as preheating brings the raw materials to the optimal reaction temperature (50~90℃), shortens the induction period, inhibits side reactions (such as the formation of urea-formaldehyde esters), improves the structural regularity of the prepolymer, and reduces the product hardness deviation from ±5HA to ±2HA, resulting in more stable mechanical properties; it can also reduce product defects, as moisture and other volatiles are removed in advance during preheating, preventing the formation of pores during mixing foaming, and breaking up raw material agglomerates, thus ensuring uniform solid-liquid dispersion.

[0034] In this implementation, refer to Figure 7As shown, the heating and mixing mechanism 5 includes a mixing cylinder 51, a mixing motor 52, a mixing spiral blade 53, and two supports 54. The two supports 54 are symmetrically arranged. The mixing cylinder 51 is horizontally arranged at the bottom of the two supports 54. The mixing cylinder 51 is connected to the preheating box 41. The mixing motor 52 is located on the side wall of the mixing cylinder 51. The mixing spiral blade 53 is drivenly connected to the main shaft of the mixing motor 52. The mixing spiral blade 53 rotates inside the mixing cylinder 51. The mixing cylinder 51 is provided with a discharge port 57. A jacket 55 is provided on the outside of the mixing cylinder 51. A heat transfer oil circulation system 56 is provided inside the jacket 55.

[0035] During the mixing of raw materials, the preheated raw materials are conveyed into the mixing cylinder 51. Then, the mixing motor 52 drives the mixing spiral blades 53 to rotate inside the mixing cylinder 51, thereby continuously conveying the raw materials forward within the mixing cylinder 51. During conveying, the raw materials are mixed and blended. Simultaneously, the jacket cylinder 55 is heated through the heat transfer oil circulation system 56, and the heat is transferred to the mixing cylinder 51 through the jacket cylinder 55 to heat the raw materials inside the mixing cylinder 51. The material stays in the mixing cylinder 51 for 5 to 8 minutes, and is moved and heated simultaneously by the mixing spiral blades 53. After mixing is completed, the mixed raw materials are discharged out through the discharge port 57.

[0036] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0037] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A polyurethane pulverizing, heating, and mixing device, characterized in that: It includes a mounting frame (1), a processing and crushing mechanism (2), a crushing and screening mechanism (3), a preheating and mixing mechanism (4), and a heating and mixing mechanism (5). The preheating and mixing mechanism (4) is located on top of the mounting frame (1). The processing and crushing mechanism (2) is located on top of the preheating and mixing mechanism (4). The crushing and screening mechanism (3) is located between the processing and crushing mechanism (2) and the preheating and mixing mechanism (4), and the crushing and screening mechanism (3) is rotatably connected to the processing and crushing mechanism (2). The heating and mixing mechanism (5) is located on the side of the preheating and mixing mechanism (4), and the preheating and mixing mechanism (4) is connected to each other.

2. The polyurethane pulverizing, heating, and mixing device according to claim 1, characterized in that: The processing and crushing mechanism (2) includes a crushing box (20), a crushing motor (21), two crushing shafts (22) and two crushing gears (23). The two crushing shafts (22) are symmetrically rotatably connected inside the crushing box (20). The two crushing gears (23) are respectively connected to the two crushing shafts (22) and mesh with each other. The crushing motor (21) is located on the side wall of the crushing box (20) and the main shaft of the crushing motor (21) is connected to one of the crushing shafts (22) for transmission. Both crushing shafts (22) are provided with several crushing blades (27). The top of the crushing box (20) is provided with a feed hopper (24).

3. The polyurethane pulverizing, heating, and mixing device according to claim 2, characterized in that: The side wall of the feed hopper (24) is provided with a number of air inlet nozzles (25), and the number of air inlet nozzles (25) are connected by connecting pipes (26).

4. The polyurethane pulverizing, heating, and mixing device according to claim 2, characterized in that: The crushing and screening mechanism (3) includes a drive motor (31), a drive shaft (32), a screening screen (33), and two drive protrusions (34). The bottom of the screening screen (33) is provided with four springs (37), and the bottom of each spring (37) is provided with a mounting plate (38). The mounting plate (38) is fixedly connected to the inner wall of the crushing box (20). The screening screen (33) slides up and down inside the crushing box (20). The drive shaft (32) is rotatably connected to the crushing box (20). The drive motor (31) is located outside the crushing box (20), and the main shaft of the drive motor (31) is connected to the drive shaft (32) in a transmission connection. The two drive protrusions (34) are symmetrically arranged on the drive shaft (32). The bottom of the screening screen (33) is provided with a drive wheel (36) connected to the two drive protrusions (34).

5. A polyurethane pulverizing, heating, and mixing device according to claim 2, characterized in that: The preheating mixing mechanism (4) includes a preheating box (41), a mixing motor (42), and a mixing rotating frame (43). The preheating box (41) is located at the bottom of the crushing box (20). The mixing motor (42) is located at the bottom of the preheating box (41). The mixing rotating frame (43) is connected to the main shaft of the mixing motor (42) via a drive. The mixing rotating frame (43) is located inside the preheating box (41). The preheating box (41) is provided with a jacket (411). An electric heating tube system (44) is provided inside the jacket (411).

6. The polyurethane pulverizing, heating, and mixing device according to claim 5, characterized in that: The heating and mixing mechanism (5) includes a mixing cylinder (51), a mixing motor (52), a mixing spiral blade (53), and two supports (54). The two supports (54) are symmetrically arranged. The mixing cylinder (51) is horizontally arranged at the bottom of the two supports (54). The mixing cylinder (51) is connected to the preheating box (41). The mixing motor (52) is located on the side wall of the mixing cylinder (51). The mixing spiral blade (53) is connected to the main shaft of the mixing motor (52) and rotates inside the mixing cylinder (51). The mixing cylinder (51) is provided with a discharge port (57). The outer side of the mixing cylinder (51) is provided with a jacket (55). The jacket (55) is provided with a heat transfer oil circulation system (56).

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