Polyurethane foaming machine

Abstract

The utility model discloses a polyurethane foaming machine which comprises a first material barrel, a second material barrel, a first feeding pipe provided with a first hydraulic pump, a second feeding pipe provided with a second hydraulic pump, a mixing gun, a first material return pipe sequentially provided with a first overflow valve and a first control valve, and a second material return pipe sequentially provided with a second overflow valve and a second control valve, one end of the first feeding pipe is communicated with the first material barrel, the other end of the first feeding pipe is communicated with the mixing gun, one end of the second feeding pipe is communicated with the second material barrel, the other end of the second feeding pipe is communicated with the mixing gun, one end of the first return pipe is connected with the first material barrel, and the other end of the first return pipe is connected with the other end of the first feeding pipe; one end of the second material return pipe is connected with the second material barrel, and the other end of the second material return pipe is connected with the other end of the second feeding pipe. Compared with the prior art, the polyurethane raw material mixing device has the advantages that polyurethane raw materials can be uniformly mixed when the mixing gun is opened after shutdown, material waste is avoided, and shutdown and production halt caused by blockage of the mixing gun are effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of foaming equipment, in particular to a polyurethane foaming machine. Background Art

[0002] Existing polyurethane foaming machines, particularly those with a low flow rate of 5 to 20 grams, can experience crystallization and solidification of the polyurethane raw material within the feed pipe during downtime. Upon restart, the hydraulic pump pumps the polyurethane raw material through the lack of pressure in the feed pipe, causing the crystallized and solidified polyurethane raw material to clog the mixing gun, requiring cleaning to enable normal operation of the polyurethane foaming machine. Even when the machine is not clogged, the lack of pressure in the feed pipe during initial startup causes uneven mixing of the polyurethane raw material within the mixing gun. The newly ejected polyurethane raw material must be discarded and cannot be used in production. Only after a certain period of spraying is the polyurethane raw material mixed evenly, and only then can the evenly mixed polyurethane raw material be used in production, resulting in significant material waste and loss. Utility Model Content

[0003] The purpose of the utility model is to provide a polyurethane foaming machine, which is used to solve the above technical problems.

[0004] The utility model discloses a polyurethane foaming machine, comprising a first material barrel, a second material barrel, a first feeding pipe, a second feeding pipe, a first hydraulic pump, a second hydraulic pump and a mixing gun, wherein one end of the first feeding pipe is connected to the first material barrel, and the other end is connected to the mixing gun, one end of the second feeding pipe is connected to the second material barrel, and the other end is connected to the mixing gun, the first hydraulic pump is arranged on the first feeding pipe, and the second hydraulic pump is arranged on the second feeding pipe, the polyurethane foaming machine also comprises a first return pipe and a second return pipe, one end of the first return pipe is connected to the first material barrel, and the other end is connected to the other end of the first feeding pipe; one end of the second return pipe is connected to the second material barrel, and the other end is connected to the other end of the second feeding pipe, the first return pipe is sequentially provided with a first overflow valve and a first control valve, and the second return pipe is sequentially provided with a second overflow valve and a second control valve.

[0005] Preferably, the first control valve and the second control valve are manual valves, hydraulic valves, pneumatic valves, or electric valves.

[0006] Preferably, one end of the first hydraulic pump is connected to the mixing gun through a first feeding pipe, and the other end is connected to the first material barrel through the first feeding pipe.

[0007] Preferably, one end of the second hydraulic pump is connected to the mixing gun through a second feeding pipe, and the other end is connected to the second material barrel through the second feeding pipe.

[0008] Preferably, the mixing gun includes a main body with a cavity, a cylinder and two connecting parts with injection nozzles. The cylinder is fixed on the right side of the main body, and the two connecting parts are respectively fixed on the front and rear sides of the main body. The cylinder column extends into the cavity and its front end can extend from the left side of the main body. Feed holes are provided on both sides of the cylinder column, and a discharge hole is provided at the front end. A first channel connecting the feed hole and the discharge hole is provided between the two holes. The injection nozzles of the two connecting parts are respectively connected to the first feeding pipe and the second feeding pipe.

[0009] Preferably, the connecting part is provided with a recess, a discharge nozzle with a second channel and a positioning sleeve, the positioning sleeve is fixed at the opening of the recess, one end of the discharge nozzle extends from the through hole of the positioning sleeve and contacts with the cylinder column of the cylinder, and a movable column and a guide groove which are pressed by a plurality of disc spring groups superimposed on each other are provided in the recess, one end of the movable column contacts with the other end of the discharge nozzle, and the other end of the movable column extends into the guide groove, and the movable column is provided with a third channel connected with the second channel of the discharge nozzle and the guide groove, and the injection nozzle is connected with the guide groove.

[0010] Preferably, the disc spring assembly comprises a first disc spring piece and a second disc spring piece coaxially stacked and aligned with each other, and the outer edge of the first disc spring piece abuts against the outer edge of the second disc spring piece.

[0011] Preferably, the movable column includes a column head and a column body, and the diameter of the column head is larger than the diameter of the column body.

[0012] Preferably, the first disc spring piece and the second disc spring piece of the disc spring assembly are both provided with openings, and the column body of the movable column is inserted into the openings so that the disc spring assembly is sleeved on the column body.

[0013] Preferably, the guide groove is provided at the bottom of the recess, and the guide groove has the same shape as the longitudinal cross-section of the movable column.

[0014] Compared with the prior art, the utility model provides a first return pipe and a second return pipe on the foaming machine, one end of the first return pipe is connected to the first material barrel, and the other end is connected to the other end of the first feeding pipe; one end of the second return pipe is connected to the second material barrel, and the other end is connected to the other end of the second feeding pipe, the first return pipe is provided with a first overflow valve and a first control valve in sequence, and the second return pipe is provided with a second overflow valve and a second control valve in sequence. When the foaming machine is spraying, the first and second control valves are first closed to maintain a certain pressure in the material pipe, and the polyurethane raw material is sprayed out from the mixing gun under pressure. When the machine is shut down, the first and second control valves are opened, and the polyurethane raw material in the first barrel circulates between the first feed pipe, the first return pipe, and the first barrel. The polyurethane raw material in the second barrel circulates between the second feed pipe, the second return pipe, and the second barrel. This ensures that the temperature of the polyurethane raw material in the material pipe does not drop, effectively reducing the crystallization and solidification of the polyurethane raw material in the material pipe. When the machine is restarted for spraying, the first and second control valves are first closed. Due to the presence of the relief valve, a certain pressure is always maintained in the material pipe even when the machine is shut down. The polyurethane raw material is sprayed out under pressure the moment the mixing gun is opened. This ensures that the polyurethane raw material is evenly mixed when the mixing gun is reopened after shutdown, minimizing material waste and loss. Even if the polyurethane raw material crystallizes and solidifies in the material pipe, it can still be sprayed out from the mixing gun smoothly, effectively reducing the possibility of mixing gun clogging and shutdown, allowing the foaming machine to operate continuously for a long time without stopping. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of a polyurethane foaming machine of the utility model;

[0016] Figure 2 for Figure 1 A perspective view of a mid-mix gun;

[0017] Figure 3 for Figure 2 A three-dimensional image with one connector removed;

[0018] Figure 4 for Figure 2 A partially cutaway perspective view of

[0019] Figure 5 for Figure 2 a cross-sectional view of another position of

[0020] The realization of the functions and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0021] The following diagrams illustrate various embodiments of the present invention. For clarity, many practical details will be included in the following description. However, it should be understood that these practical details are not intended to limit the present invention. In other words, in some embodiments of the present invention, these practical details are not essential. Furthermore, to simplify the drawings, some commonly used structures and components are depicted in simplified schematic form.

[0022] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0023] In addition, in the present invention, descriptions such as "first" and "second" are only used for descriptive purposes and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0024] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings:

[0025] like Figure 1As shown, a polyurethane foaming machine of the present invention includes a first material barrel 1, a second material barrel 2, a first feeding pipe 3, a second feeding pipe 4, a first hydraulic pump 5, a second hydraulic pump 6 and a mixing gun 7. One end of the first feeding pipe 3 is connected to the first material barrel 1, and the other end is connected to the mixing gun 7. One end of the second feeding pipe 4 is connected to the second material barrel 2, and the other end is connected to the mixing gun 7. The first hydraulic pump 5 is arranged on the first feeding pipe 3, and the second hydraulic pump 6 is arranged on the second feeding pipe 4. The polyurethane foaming machine also includes a first return pipe 8 and a second return pipe 9. One end of the first return pipe 8 is connected to the first material barrel 1, and the other end is connected to the other end of the first feeding pipe 3; one end of the second return pipe 9 is connected to the second material barrel 2, and the other end is connected to the other end of the second feeding pipe 4. The first return pipe 8 is sequentially provided with a first overflow valve 10 and a first control valve 11, and the second return pipe 9 is sequentially provided with a second overflow valve 12 and a second control valve 13. The first control valve 11 and the second control valve 13 are manual valves or hydraulic valves or pneumatic valves or electric valves. The first barrel 1 and the second barrel 2 contain different polyurethane raw materials. Compared with the prior art, when the foaming machine of the utility model is spraying, the first control valve 11 and the second control valve 13 are first closed to maintain a certain pressure in the material pipe, and the polyurethane raw material is sprayed out from the mixing gun 7 under pressure; when the machine is shut down, the first control valve 11 and the second control valve 13 are opened, and the polyurethane raw material in the first barrel 1 will circulate between the first feeding pipe 3, the first return pipe 8 and the first barrel 1 to ensure that the temperature of the polyurethane raw material in the material pipe does not decrease; the polyurethane raw material in the second barrel 2 will circulate between the second feeding pipe 4, the second return pipe 9 and the second barrel 2 to ensure that the temperature of the polyurethane raw material in the material pipe does not decrease. , which has the advantage of effectively reducing the crystallization and solidification of polyurethane raw materials in the material pipe; when restarting the spraying, first close the first control valve 11 and the second control valve 13. Due to the presence of the overflow valve, a certain pressure is always maintained in the material pipe when the machine is stopped. The polyurethane raw material is sprayed out under the action of pressure at the moment the mixing gun 7 is opened, which ensures that the polyurethane raw material can be mixed evenly when the mixing gun 7 is opened again after the machine is stopped, and will not cause material waste and loss; even if the polyurethane raw material crystallizes and solidifies in the material pipe, it can be sprayed out smoothly from the mixing gun 7, effectively reducing the situation where the mixing gun 7 is blocked and the machine is stopped and production is stopped, so that the foaming machine can work continuously for a long time without stopping.

[0026] Specifically, one end of the first hydraulic pump 5 is connected to the mixing gun 7 via the first feeding pipe 3, and the other end is connected to the first material barrel 1 via the first feeding pipe 3. One end of the second hydraulic pump 6 is connected to the mixing gun 7 via the second feeding pipe 4, and the other end is connected to the second material barrel 2 via the second feeding pipe 4.

[0027] Furthermore, if Figures 2 to 5As shown, the mixing gun 7 includes a main body 702 with a cavity 701, a cylinder 703 and two connecting parts 705 with injection nozzles 704. The cylinder 703 is fixed on the right side of the main body 702, and the two connecting parts 705 are respectively fixed on the front and rear sides of the main body 702. The cylinder column 706 of the cylinder 703 extends into the cavity 701 and its front end extends from the left side of the main body 702. Feed holes 707 are provided on both sides of the cylinder column 706, and a discharge hole 708 is provided at the front end. A first channel 709 is provided between the feed hole 707 and the discharge hole 708 to connect the two. One of the injection nozzles 704 in the two connecting parts 705 is connected to the first feeding pipe 3, and the other injection nozzle 704 is connected to the second feeding pipe 4.

[0028] More specifically, the connecting member 705 is provided with a recess 710, a discharge nozzle 712 with a second channel 711 and a positioning sleeve 713. The positioning sleeve 713 is fixed at the opening of the recess 710. One end of the discharge nozzle 712 extends from the through hole of the positioning sleeve 713 and contacts with the cylinder column 706 of the cylinder 703. A movable column 714 and a guide groove 715 which are pressed by a plurality of disc spring groups superimposed on each other are provided in the recess 710. One end of the movable column 714 contacts with the other end of the discharge nozzle 712, and the other end of the movable column 714 extends into the guide groove 715. The movable column 714 is provided with a third channel 716 connected with the second channel 711 and the guide groove 715 of the discharge nozzle 712, and the injection nozzle 704 is connected with the guide groove 715. Compared with the prior art which uses a coil spring to press the discharge nozzle, which is prone to leakage, the multiple disc spring groups stacked on each other can withstand a larger load with smaller deformation, and have greater shock absorption capacity than the coil spring. The pressure of the multiple disc spring groups is concentrated on the discharge nozzle 712 through the movable column 714, so that one end of the discharge nozzle 712 is in close contact with the cylinder column 706 of the cylinder 703, effectively preventing the polyurethane raw material from leaking from between the discharge nozzle and the cylinder column 21. It is easy to use, can ensure that the foaming gun can work continuously for a long time, and effectively further ensures that the production efficiency of the foaming machine is not affected.

[0029] Furthermore, the disc spring assembly comprises a first disc spring piece 717 and a second disc spring piece 718, which are coaxially stacked and aligned. The outer edge of the first disc spring piece 717 abuts the outer edge of the second disc spring piece 718. The movable column 714 comprises a head and a body, with the head having a larger diameter than the body. Both the first disc spring piece 717 and the second disc spring piece 718 of the disc spring assembly are provided with openings, into which the body of the movable column 714 is inserted, thereby securing the disc spring assembly to the body. A guide groove 715 is provided at the bottom of the recess 710. The guide groove 715 and the movable column 714 have the same longitudinal cross-sectional shape. Both the guide groove 715 and the movable column 714 have circular longitudinal cross-sectional shapes.

[0030] The working principle of a polyurethane foaming machine of the present invention is as follows: when the machine is shut down (shutdown means that only the mixing gun 7 is closed, and the foaming machine is still in normal operation), the first control valve 11 and the second control valve 13 are opened, the first hydraulic pump 5 continues to work, and the polyurethane raw material in the first barrel 1 is pumped by the first hydraulic pump 5 through the first feeding pipe 3 to the mixing gun 7 and the first return pipe 8. When the pressure in the first return pipe 8 is greater than the working pressure of the first relief valve 10, the first relief valve 10 is opened to allow the polyurethane raw material to flow back into the first barrel 1, and the polyurethane raw material circulates between the first feeding pipe 3, the first return pipe 8 and the first barrel 1; similarly The second hydraulic pump 6 also continues to work, and the polyurethane raw material in the second barrel 2 is pumped by the second hydraulic pump 6 through the second feeding pipe 4 to the mixing gun 7 and the second return pipe 9. When the pressure in the second return pipe 9 is greater than the working pressure of the second relief valve 12, the second relief valve 12 opens to allow the polyurethane raw material to flow back into the second barrel 1, and the polyurethane raw material circulates between the second feeding pipe 4, the second return pipe 9 and the second barrel 2; when spraying is required, the first control valve 11 and the second control valve 13 are closed. Due to the existence of the relief valve, a certain pressure is always maintained in the material pipe during shutdown, and the polyurethane raw material is sprayed out under pressure at the moment the mixing gun 7 is opened. The polyurethane raw materials in the first feeding pipe 3 and the second feeding pipe 4 are injected into the mixing gun 7 through two injection nozzles 704. The materials injected from the injection nozzles 704 first enter the guide groove 715, then enter the third channel 716 of the movable column 714, and then enter the second channel 711 of the discharge nozzle 712 from the third channel 716. When the discharge nozzle 712 is facing the feed holes 707 on both sides of the cylinder column 706, the materials enter the first channel 709 from the feed hole 707 and are mixed and then ejected from the discharge hole 708 (as shown in FIG. Figure 5 (As shown by the arrow), if the discharge nozzle 712 is staggered from the feed holes 707 on both sides of the cylinder column 706, the pressure of the multiple disc spring groups is concentrated on the discharge nozzle 712 through the movable column 714, so that one end of the discharge nozzle 712 is in close contact with the cylinder column 706 of the cylinder 703 to prevent material from leaking from between the discharge nozzle 712 and the cylinder column 706.

[0031] As shown in 1, the foaming machine also includes a chiller 14 and two heat exchangers 15 for maintaining a constant temperature of the polyurethane raw material. The chiller 14 is connected to the two heat exchangers 15. One heat exchanger 15 is installed on the first feeding pipe 3, and the other heat exchanger 15 is installed on the second feeding pipe 4. Since the application of the chiller 14 and the two heat exchangers 15 in the foaming machine belongs to the existing technology, they will not be described here.

[0032] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements or improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A polyurethane foaming machine, comprising a first material barrel, a second material barrel, a first feed pipe, a second feed pipe, a first hydraulic pump, a second hydraulic pump, and a mixing gun, wherein one end of the first feed pipe is connected to the first material barrel and the other end is connected to the mixing gun, one end of the second feed pipe is connected to the second material barrel and the other end is connected to the mixing gun, the first hydraulic pump is provided on the first feed pipe, and the second hydraulic pump is provided on the second feed pipe, characterized in that: The polyurethane foaming machine also includes a first return pipe and a second return pipe, one end of the first return pipe is connected to the first barrel, and the other end is connected to the other end of the first feeding pipe; one end of the second return pipe is connected to the second barrel, and the other end is connected to the other end of the second feeding pipe, the first return pipe is sequentially provided with a first overflow valve and a first control valve, and the second return pipe is sequentially provided with a second overflow valve and a second control valve.

2. A polyurethane foaming machine according to claim 1, characterized in that, The first control valve and the second control valve are manual valves, hydraulic valves, pneumatic valves, or electric valves.

3. A polyurethane foaming machine according to claim 1, characterized in that, One end of the first hydraulic pump is connected to the mixing gun through the first feeding pipe, and the other end is connected to the first material barrel through the first feeding pipe.

4. A polyurethane foaming machine according to claim 1, characterized in that, One end of the second hydraulic pump is connected to the mixing gun through the second feeding pipe, and the other end is connected to the second material barrel through the second feeding pipe.

5. A polyurethane foaming machine according to claim 1, characterized in that, The mixing gun includes a main body with a cavity, a cylinder and two connecting parts with injection nozzles. The cylinder is fixed on the right side of the main body, and the two connecting parts are respectively fixed on the front and rear sides of the main body. The cylinder column extends into the cavity and its front end can extend from the left side of the main body. Feed holes are provided on both sides of the cylinder column, and a discharge hole is provided at the front end. A first channel connecting the feed hole and the discharge hole is provided between the two. The injection nozzles of the two connecting parts are respectively connected to the first feeding pipe and the second feeding pipe.

6. A polyurethane foaming machine according to claim 5, characterized in that, The connecting part is provided with a recess, a discharge nozzle with a second channel and a positioning sleeve. The positioning sleeve is fixed at the opening of the recess. One end of the discharge nozzle extends from the through hole of the positioning sleeve and contacts with the cylinder column of the cylinder. A movable column and a guide groove which are pressed by a plurality of disc spring groups superimposed on each other are provided in the recess. One end of the movable column contacts with the other end of the discharge nozzle, and the other end of the movable column extends into the guide groove. The movable column is provided with a third channel connected with the second channel of the discharge nozzle and the guide groove, and the injection nozzle is connected with the guide groove.

7. A polyurethane foaming machine according to claim 6, characterized in that: The disc spring assembly comprises a first disc spring piece and a second disc spring piece coaxially stacked together, and the outer edge of the first disc spring piece abuts against the outer edge of the second disc spring piece.

8. A polyurethane foaming machine according to claim 6, characterized in that, The movable column comprises a column head and a column body, and the diameter of the column head is larger than the diameter of the column body.

9. A polyurethane foaming machine according to claim 8, characterized in that: The first disc spring piece and the second disc spring piece of the disc spring group are both provided with openings, and the column body of the movable column is inserted into the openings so that the disc spring group is sleeved on the column body.

10. The polyurethane foaming machine according to claim 6, characterized in that: The guide groove is arranged at the bottom of the recess, and the guide groove has the same longitudinal cross-sectional shape as that of the movable column.

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