Raw material mixing device for preparing polyurethane

Abstract

The utility model relates to a raw material mixing device for polyurethane preparation, which comprises a main mixing box and three branch mixing boxes, each branch mixing box is communicated with the main mixing box through a feeding pipe, the top ends of the three branch mixing boxes are communicated with branch pipes through connecting pipes, the top ends of the branch pipes are communicated with hoppers, and the top ends of the branch pipes are communicated with the main mixing box through connecting pipes. A primary screening mechanism is installed in the material distributing pipe, and a filter screen component is movably installed in the primary screening mechanism. According to the raw material mixing device for polyurethane preparation, the silk screen discs are arranged in the material distributing pipes to primarily screen raw materials, so that the raw materials can be fed into the different mixing boxes through the connecting pipes to be independently stirred, the stirring area is increased, and due to targeted stirring, the overall stirring efficiency is improved; the raw materials in the multiple branch mixing boxes are uniformly and totally mixed, so that the raw material mixing quality is good, the installation disc which can be separated through rotation is connected with the silk screen disc, the silk screen disc is easy to maintain and clean in the later period, and the practicability of the device is improved.

Description

Technical Field

[0001] The present application relates to the technical field of polyurethane preparation, and in particular to a raw material mixing device for polyurethane preparation. Background Art

[0002] Polyurethane is an important polymer material, usually used to prepare foam plastics, coatings, adhesives, etc. When preparing polyurethane, multiple raw materials need to be mixed and reacted. Raw material storage tanks are usually used to store various raw materials required for polyurethane preparation, such as isocyanate, polyether polyol, and catalyst. The raw materials are transported from the storage tanks through pipelines to the mixing and stirring device and mixed together according to a certain formula ratio.

[0003] At present, the production system in the prior art directly delivers various raw materials in the storage tube into the mixing kettle for mixing through the conveying system. Since the raw materials may be affected by moisture and impurities, and the particle size distribution of some solid raw materials such as polyether polyols is not accurately checked, the accuracy and stability of the raw material mixing reaction are reduced. In this regard, a raw material mixing device for polyurethane preparation is proposed to solve the above-mentioned problems. Utility Model Content

[0004] In view of the shortcomings of the prior art, the present application provides a raw material mixing device for preparing polyurethane, which has the advantages of initial screening and then classification processing, increasing the stirring area and improving the stirring efficiency, while also improving the uniformity and consistency of the final mixing of the product.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solution: a raw material mixing device for preparing polyurethane, comprising a total mixing box and three sub-mixing boxes, each of the sub-mixing boxes is connected to the total mixing box through a feed pipe, the top ends of the three sub-mixing boxes are connected to a sub-material pipe through a connecting pipe, the top ends of the sub-material pipes are connected to a hopper, and a primary screening mechanism is installed inside the sub-material pipes;

[0006] A filter member is movably installed inside the primary screening mechanism, and a reinforcing plate is fixedly installed outside the material distribution pipe, and the reinforcing plate is located on one side surface of the primary screening mechanism.

[0007] Furthermore, the primary screening mechanism includes a connecting frame fixedly mounted on the outside of the material distribution pipe, and a mounting plate is rotatably mounted on the connecting frame, and the mounting plate corresponds to the cross section of the material distribution pipe.

[0008] Furthermore, a connecting sleeve is fixedly installed on the outer side of the mounting plate, a positioning pin is slidably installed in the connecting sleeve, a positioning sleeve is fixedly installed on the outer wall of the material distribution pipe, and the positioning pin is plugged into the positioning sleeve.

[0009] Furthermore, an extension ring is fixedly installed on the outside of the positioning pin, and a compression spring is installed between the extension ring and the connecting sleeve.

[0010] Furthermore, the top end of the positioning pin has a limiting cap with an area larger than the inner diameter of the connecting sleeve, which is used to prevent the positioning pin from detaching, and the lower end of the positioning pin is hemispherical.

[0011] Furthermore, the filter component comprises a wire mesh disk with one end hinged to the inner wall of the mounting disk, and a push spring is connected between the wire mesh disk and the inner wall of the mounting disk.

[0012] Furthermore, a solenoid valve is fixedly installed on the outside of the feed pipe, a first stirring motor is fixedly installed on the outside of the total mixing box, a stirring shaft located in the total mixing box is fixedly installed on the output end of the first stirring motor, a second stirring motor is fixedly installed on the outside of the sub-mixing box, and a stirring shaft located in the sub-mixing box is fixedly connected to the output end of the second stirring motor.

[0013] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0014] The raw material mixing device for preparing polyurethane performs primary screening of raw materials by installing a wire mesh disk in a material distribution pipe, so that the raw materials can be respectively sent to different sub-mixing boxes through connecting pipes for separate mixing, thereby increasing the mixing area. Due to the targeted mixing, the overall mixing efficiency is improved, and the raw materials in multiple sub-mixing boxes are uniformly mixed, so that the raw material mixing quality is better. The wire mesh disk is connected by a rotatable and separable mounting disk, so that the wire mesh disk is easy to maintain and clean later, thereby improving the practicality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a front view of the overall structure of this application;

[0016] Figure 2 For this application Figure 1 A magnified view of the structure at center A;

[0017] Figure 3 This is a schematic diagram of the structure of the material distribution pipe in this application;

[0018] Figure 4 This is a structural stereogram of the mounting plate and the wire mesh plate for this application.

[0019] In the figure: 1. main mixing box; 2. sub-mixing box; 3. feed pipe; 4. first stirring motor; 5. second stirring motor; 6. solenoid valve; 7. feed pipe; 8. connecting pipe; 9. hopper; 10. connecting frame; 11. mounting plate; 12. positioning sleeve; 13. connecting sleeve; 14. positioning pin; 15. extension ring; 16. compression spring; 17. reinforcement plate; 18. wire mesh plate; 19. push spring. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0021] See also Figure 1-4 A raw material mixing device for preparing polyurethane in this embodiment includes a main mixing box 1 and three sub-mixing boxes 2. Each of the sub-mixing boxes 2 is connected to the main mixing box 1 through a feeding pipe 3, so that the raw materials separately stirred in the three sub-mixing boxes 2 can be merged into the main mixing box 1 to complete the raw material preparation of polyurethane.

[0022] It should be noted that a solenoid valve 6 is fixedly installed on the outside of the feed pipe 3 , and the solenoid valve 6 can control the materials in the sub-mixing box 2 to flow into the main mixing box 1 .

[0023] In this embodiment, a first stirring motor 4 is fixedly installed on the outer side of the mixing box 1, and a stirring shaft located in the mixing box 1 is fixedly installed on the output end of the first stirring motor 4. The stirring shaft can be a spiral stirring rod. The first stirring motor 4 can achieve uniform stirring and mixing of the materials introduced into the mixing box 1.

[0024] In addition, a second stirring motor 5 is fixedly installed on the outside of the mixing box 2, and a stirring shaft located in the mixing box 2 is fixedly connected to the output end of the second stirring motor 5. The number of the second stirring motors 5 and the mixing boxes 2 corresponds to each other, so that different second stirring motors 5 can stir different mixing boxes 2 separately, thereby improving the raw material mixing efficiency.

[0025] It should be noted that the top ends of the three dividing and mixing boxes 2 are connected to a dividing pipe 7 through a connecting pipe 8, the top end of the dividing pipe 7 is connected to a hopper 9, a primary screening mechanism is installed inside the dividing pipe 7 for classifying raw materials, and the primary screening mechanism includes a connecting frame 10 fixedly installed on the outside of the dividing pipe 7, a mounting disk 11 is rotatably installed on the connecting frame 10, the mounting disk 11 corresponds to the cross-section of the dividing pipe 7, and the mounting disk 11 can be separated by rotating the mounting disk 11.

[0026] The mounting plate 11 in this embodiment has a filter element movably installed inside for screening the fallen raw materials, a connecting sleeve 13 is also fixedly installed on the outside of the mounting plate 11, a positioning pin 14 is slidably installed in the connecting sleeve 13, a positioning sleeve 12 is fixedly installed on the outer wall of the distribution pipe 7, the positioning pin 14 is plugged into the positioning sleeve 12, and the position of the mounting plate 11 can be limited by the mutual plugging between the positioning pin 14 and the positioning sleeve 12.

[0027] In this embodiment, an extension ring 15 is fixedly installed on the outside of the positioning pin 14, and a compression spring 16 is installed between the extension ring 15 and the connecting sleeve 13. One end of the compression spring 16 is fixedly connected to the connecting sleeve 13, and the other end is fixedly connected to the positioning sleeve 12. The compression spring 16 pushes the extension ring 15 in a direction away from the connecting sleeve 13, so that the positioning pin 14 can be extended in the direction of the positioning sleeve 12 and complete the plug-in limit.

[0028] It should be noted that the top end of the locating pin 14 has a limiting cap with an area larger than the inner diameter of the connecting sleeve 13, which is used to prevent the locating pin 14 from detaching, and the lower end of the locating pin 14 is hemispherical, which can facilitate the locating pin 14 to pass over the locating sleeve 12 by squeezing.

[0029] In order to stabilize the distribution pipe 7 divided into multiple sections, a reinforcing plate 17 is fixedly installed on the outside of the distribution pipe 7 in this embodiment. The reinforcing plate 17 is located on one side surface of the mounting plate 11, so that the mounting plate 11 can still be deflected and separated toward the other side.

[0030] In this embodiment, the filter component includes a wire mesh disk 18 whose one end is hinged to the inner wall of the mounting disk 11, and a push spring 19 is connected between the wire mesh disk 18 and the inner wall of the mounting disk 11. One end of the push spring 19 is fixedly connected to the circular ring portion on the inner side of the mounting disk 11, and the other end is fixedly connected to the wire mesh disk 18. The push spring 19 can push the wire mesh disk 18 to the surface position of the mounting disk 11, so that the coarse particles screened by the wire mesh disk 18 can slide into the interior of the connecting tube 8.

[0031] The working principle of the above embodiment is:

[0032] The raw materials are put into the distribution pipe 7 through the hopper 9, and the raw materials falling into the distribution pipe 7 are preliminarily screened by the wire mesh disk 18 of the filter component. The fine particles fall directly vertically, and the coarse particles blocked by the wire mesh disk 18 slide along the inclined direction of the wire mesh disk 18 to the inside of the connecting pipe 8, and are separated into a sub-mixing box 2 along the connecting pipe 8. The raw materials with different particle sizes and properties after the preliminary screening are separately stirred and mixed in three different sub-mixing boxes 2, so that the overall mixing efficiency is improved. After the mixing is completed, the solenoid valve 6 is controlled to make the raw materials in the three sub-mixing boxes 2 converge and stir evenly again, so that the stirring effect is improved.

[0033] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0034] Although the embodiments of the present application have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A raw material mixing device for preparing polyurethane, comprising a main mixing box (1) and three sub-mixing boxes (2), each of the sub-mixing boxes (2) being connected to the main mixing box (1) via a feed pipe (3), characterized in that: The top ends of the three distribution and mixing boxes (2) are connected to a distribution pipe (7) through a connecting pipe (8), the top ends of the distribution pipes (7) are connected to a hopper (9), and a primary screening mechanism is installed inside the distribution pipes (7); A filter screen component is movably installed inside the primary screening mechanism, and a reinforcing plate (17) is fixedly installed outside the material distribution pipe (7), and the reinforcing plate (17) is located on a side surface of the primary screening mechanism.

2. A raw material mixing device for preparing polyurethane according to claim 1, characterized in that: The primary screening mechanism comprises a connecting frame (10) fixedly mounted on the outside of the material distribution pipe (7), a mounting plate (11) being rotatably mounted on the connecting frame (10), and the mounting plate (11) corresponds to the cross section of the material distribution pipe (7).

3. A raw material mixing device for preparing polyurethane according to claim 2, characterized in that: A connecting sleeve (13) is fixedly mounted on the outer side of the mounting plate (11), a positioning pin (14) is slidably mounted inside the connecting sleeve (13), a positioning sleeve (12) is fixedly mounted on the outer wall of the material distribution pipe (7), and the positioning pin (14) is plugged into the positioning sleeve (12).

4. A raw material mixing device for preparing polyurethane according to claim 3, characterized in that: An extension ring (15) is fixedly mounted on the outside of the positioning pin (14), and a compression spring (16) is mounted between the extension ring (15) and the connecting sleeve (13).

5. A raw material mixing device for preparing polyurethane according to claim 3, characterized in that: The top end of the positioning pin (14) has a limiting cap with an area larger than the inner diameter of the connecting sleeve (13) for preventing the positioning pin (14) from being disengaged, and the lower end of the positioning pin (14) is hemispherical.

6. A raw material mixing device for preparing polyurethane according to claim 2, characterized in that: The filter component comprises a wire mesh plate (18) with one end hinged to the inner wall of the mounting plate (11), and a push spring (19) is connected between the wire mesh plate (18) and the inner wall of the mounting plate (11).

7. A raw material mixing device for preparing polyurethane according to claim 1, characterized in that: A solenoid valve (6) is fixedly mounted on the outside of the feed pipe (3); a first stirring motor (4) is fixedly mounted on the outside of the total mixing box (1); a stirring shaft located in the total mixing box (1) is fixedly mounted on the output end of the first stirring motor (4); a second stirring motor (5) is fixedly mounted on the outside of the sub-mixing box (2); and a stirring shaft located in the sub-mixing box (2) is fixedly connected to the output end of the second stirring motor (5).

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