Polyurethane high pressure foaming machine

Abstract

The application discloses a polyurethane high-pressure foaming machine and belongs to the technical field of foaming. Mainly comprising a foaming machine body, and the foaming machine body is provided with a mixing head with a spray pipe and a nozzle, a dredging assembly is arranged on one side of the mixing head, the dredging assembly comprises a guide hole arranged on one side of the spray pipe, a guide frame is arranged on one side of the mixing head, a guide groove is arranged on the guide frame, and a thimble is arranged in the guide groove. The polyurethane high-pressure foaming machine can smoothly pass through the nozzle.

Description

Technical Field

[0001] This application relates to the field of foaming technology, specifically to a polyurethane high-pressure foaming machine. Background Technology

[0002] As a core piece of equipment in the production of products such as car seats and building insulation boards, the polyurethane high-pressure foaming machine works by using a high-pressure pump to transport isocyanate (material A) and polyol (material B) through a connecting pipe to a mixing head, where they are mixed by impact under a pressure of 15-30 MPa, and finally sprayed into a mold through a nozzle.

[0003] For example, patent CN210964823U discloses a novel polyurethane high-pressure foaming machine. This patent uses a three-way hole inside a spherical core block, consisting of two coaxial material inlet holes and a vertical outlet hole, to form a right-angle converging flow channel. This structure easily creates a flow dead zone at the material confluence point (i.e., the conical outlet inlet).

[0004] In actual use, due to differences in the reactivity of raw materials (especially when using fast-curing systems), some unmixed viscous materials may continue to accumulate in the conical constriction section of the nozzle. Long-term accumulation of materials may solidify and form hard substances, increasing the difficulty of cleaning. This not only requires more frequent shutdowns for cleaning, but may also corrode the nozzle material and shorten the service life of the equipment.

[0005] Therefore, it is necessary to provide a polyurethane high-pressure foaming machine to solve the above problems.

[0006] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore may include information that does not constitute prior art. Summary of the Invention

[0007] Based on the aforementioned problems in the existing technology, the problem to be solved by this application is to provide a polyurethane high-pressure foaming machine, which solves the problem that insufficiently mixed viscous materials will continue to accumulate in the conical contraction section of the nozzle, causing corrosion to the nozzle material and shortening the service life of the equipment.

[0008] The technical solution adopted by this application to solve its technical problem is: a polyurethane high-pressure foaming machine, including:

[0009] The foaming machine body is equipped with a mixing head having a spray pipe and a nozzle;

[0010] A dredging assembly, disposed on one side of the mixing head, the dredging assembly comprising:

[0011] A guide hole is provided on one side of the nozzle, and the axis of the guide hole coincides with the radial direction of the nozzle.

[0012] A guide frame is disposed on one side of the mixing head;

[0013] A guide groove is formed on the guide frame, and the center line of the guide groove is collinear with the axis of the guide hole.

[0014] A ejector pin is disposed within the guide groove, and the diameter of the ejector pin forms a clearance fit with the guide hole.

[0015] Furthermore, the tip of the ejector pin is set with a conical angle.

[0016] Furthermore, a pusher is fixedly connected to the end of the ejector pin.

[0017] Furthermore, a gate valve is installed on the inner end face of the guide hole, and the sealing surface of the gate valve is covered with a chemically resistant fluororubber gasket.

[0018] Furthermore, a compression spring is installed at the bottom of the guide groove, and a retaining ring is fixed in the middle of the ejector pin.

[0019] The beneficial effect of this application is that the polyurethane high-pressure foaming machine provided by this application achieves the effect of unblocking the nozzle by setting up a unclogging component.

[0020] In addition to the purposes, features, and advantages described above, this application has other purposes, features, and advantages. A further detailed description of this application will be provided below with reference to the figures. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0022] In the attached diagram:

[0023] Figure 1 This is an overall schematic diagram of the polyurethane high-pressure foaming machine in this application;

[0024] Figure 2 for Figure 1 A schematic diagram of the mixing head;

[0025] Figure 3 for Figure 1 Another angle diagram of the mixing head;

[0026] Figure 4 for Figure 1 A cross-sectional view of the mixing head from another angle;

[0027] Figure 5 for Figure 3 A schematic diagram of A in the middle;

[0028] Figure 6 for Figure 4 A schematic diagram of B in the middle;

[0029] The following are the labeling elements in the figure:

[0030] 1. Foaming machine body; 2. Connecting pipe; 3. Mixing head; 30. Spray pipe; 31. Nozzle; 32. Unblocking component; 321. Guide hole; 322. Guide frame; 324. Gate valve; 328. Spring; 320. Guide groove; 325. Push handle; 326. Ejector pin; 327. Retaining ring. Detailed Implementation

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0032] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0033] like Figures 1-3 As shown, the polyurethane high-pressure foaming machine provided in this application is mainly used in the high-pressure mixing and foaming process of polyurethane raw materials in the fields of automotive interiors and thermal insulation building materials. The polyurethane high-pressure foaming machine includes a foaming machine body 1, which has a built-in high-pressure pump. The built-in high-pressure pump pressurizes and delivers the polyurethane raw materials (a mixture of isocyanate and polyol). To ensure that the raw materials are fully mixed, a connecting pipe 2 is fixedly connected to the output end of the foaming machine body 1. The end of the connecting pipe 2 extends to the mixing area, and a mixing head 3 is fixedly connected to the outlet end of the connecting pipe 2. The mixing head 3 has a turbulence enhancement structure inside, so that the two high-pressure raw materials can be instantly and uniformly mixed during the collision process.

[0034] To achieve directional spraying of the mixed materials, a spray pipe 30 is fixedly installed at the output end of the mixing head 3, and a nozzle 31 is opened at the end of the spray pipe 30.

[0035] To prevent material from clogging at nozzle 31, such as Figures 2-6 As shown, a clearing component 32 is provided on the mixing head 3 at one side of the nozzle 30 along the axis. The clearing component 32 includes a guide hole 321 opened on one side of the nozzle 30. The guide hole 321 is coaxially arranged with the nozzle 30 to guide the movement of the subsequent clearing mechanism.

[0036] Meanwhile, a guide frame 322 is fixedly provided on one side of the mixing head 3 corresponding to the guide hole 321, and a guide groove 320 is provided inside the guide frame 322. It should be noted that the guide groove 320 is coaxially arranged with the guide hole 321.

[0037] Furthermore, a ejector pin 326 is slidably disposed within the guide groove 320. The diameter of the ejector pin 326 forms a clearance fit with the guide hole 321. At the same time, the tip of the ejector pin 326 is set with a tapered angle. A pusher 325 is fixedly connected to the end of the ejector pin 326, so that the operator can manually push the pusher 325 to drive the ejector pin 326 to move along the guide groove 320.

[0038] It should be noted that the working section length of the ejector pin 326 is greater than the inner diameter of the nozzle 30, so that when the ejector pin 326 is fully inserted, the tip of the ejector pin 326 can penetrate the entire nozzle 30 and move to the nozzle 31 to remove contaminants adhering to the nozzle 31.

[0039] To prevent raw material leakage during normal operation, a gate valve 324 is installed on the inner end face of the guide hole 321. The sealing surface of the gate valve 324 is covered with a chemically resistant fluororubber gasket. The gate valve 324 can be opened and closed in the direction perpendicular to the guide hole 321. Thus, when the equipment is running normally, the gate valve 324 can close the guide hole 321 to form a pressure seal. When the nozzle 31 needs to be cleaned, the gate valve 324 can be opened to expose the guide hole 321 for subsequent cleaning and unblocking operations.

[0040] To achieve automatic reset of the ejector pin 326, a compression spring 328 is installed at the bottom of the guide groove 320, and a retaining ring 327 is fixed in the middle of the ejector pin 326.

[0041] Thus, when the operator pushes the pusher 325, the ejector pin 326 moves into the nozzle 30, at which time the retaining ring 327 synchronously compresses the spring 328;

[0042] When the retaining ring 327 contacts the bottom of the guide groove 320, the ejector pin 326 just completely penetrates the nozzle 30. After the thrust is removed, the spring 328 releases its stored energy to push the retaining ring 327 back to its original position, and drives the ejector pin 326 out of the nozzle 30. This reciprocating motion can be manually operated to achieve the unblocking operation.

[0043] When the equipment is started, the high-pressure pump presses the raw material into the mixing head 3 through the connecting pipe 2 and mixes it. Then, it is sprayed into the mold through the nozzle 31 through the spray pipe 30. When the nozzle 31 is detected to be blocked, the raw material supply is automatically shut off, the gate valve 324 is opened and the unblocking program is triggered. At this time, the pusher 325 can be pushed to make the ejector pin 326 penetrate the guide hole 321 and enter the spray pipe 30. The needle tip is used to scrape off the adhering material on the inner wall of the nozzle 31.

[0044] Then, spring 328 causes ejector pin 326 to return to the standby position. This process is repeated 3-5 times to complete the unblocking operation. Finally, gate valve 324 can be closed, and the system resumes material supply and production.

[0045] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A polyurethane high pressure foaming machine characterized by: The utility model relates to a foaming machine, which comprises: a foaming machine body (1) provided with a mixing head (3) having a spray pipe (30) and a nozzle (31); a dredging assembly (32) arranged on one side of the mixing head (3), the dredging assembly (32) comprising: a guide hole (321) arranged on one side of the spray pipe (30), the guide hole (321) having an axis coinciding with the radial direction of the spray pipe (30); a guide frame (322) arranged on one side of the mixing head (3); a guide groove (320) arranged on the guide frame (322), the guide groove (320) having a center line coinciding with the axis of the guide hole (321); a thimble (326) arranged in the guide groove (320), the thimble (326) having a diameter forming a clearance fit with the guide hole (321).

2. The polyurethane high pressure foaming machine of claim 1, wherein: The tip of the thimble (326) is provided with a taper angle.

3. The polyurethane high pressure foaming machine of claim 1, wherein: The end of the thimble (326) is fixedly connected with a push handle (325).

4. The polyurethane high pressure foaming machine of claim 1, wherein: The inner end surface of the guide hole (321) is provided with a gate valve (324), and the sealing surface of the gate valve (324) is covered with a chemical corrosion-resistant fluorine rubber pad.

5. The polyurethane high pressure foaming machine of claim 1, wherein: The bottom of the guide groove (320) is provided with a compression spring (328), and the middle of the thimble (326) is fixedly provided with a retaining ring (327).

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