Mixing chamber structure of polyurethane mixing head

Abstract

The utility model discloses a polyurethane mixing head mixing chamber structure which comprises a mixing cavity, the mixing cavity is a hexahedron, two opposite faces of the mixing cavity are respectively provided with a channel opening, a channel A and a channel B which are symmetrical are respectively arranged in the two channel openings, the end of the channel A and the end of the channel B are communicated with a mixing pipeline, and the mixing pipeline is communicated with the mixing cavity. The horizontal included angle of the two channels is 15 degrees, the relative included angle of the two channels is 120 degrees, a feeding port A and a feeding port B are formed in openings of the two channels respectively and communicated with the channel A and the channel B through hole flow channels respectively, and a discharging port communicated with the mixing pipeline is further formed in the mixing cavity. The two single-component raw materials are pumped into the two channels by a metering pump of the polyurethane foaming machine through the two feeding ports respectively, enter the mixing pipeline, are collided and mixed and then are discharged. According to the utility model, two components are fed in a space angle layout, collision mixing is carried out, a high-speed turbulent flow state is formed, the mixing effect is good, and the density and hardness of a finally foamed product are uniform.

Description

Technical Field

[0001] The utility model relates to the field of polyurethane mixing equipment, in particular to a polyurethane mixing head mixing chamber structure. Background Art

[0002] The polyurethane mixing head is a device used to spray and mix two raw materials from AB tanks in the multi-mode continuous production of hard, semi-hard polyurethane products and polyurethane elastomer products, and spray the mixed polyurethane into the mold for cooling and molding. When not in injection molding, cleaning agent and air can be injected into the mixing cavity to clean the mixing cavity and prevent clogging of the channel. The mixing chamber is a device used to mix two polyurethane components. In the existing mixing chamber, the two raw materials are arranged at 180 degrees and mixed by horizontal collision. The mixing effect is not good, and the density and hardness of the final foamed product are uneven. Therefore, the existing technology needs to be improved. Utility Model Content

[0003] In order to overcome the defects of the prior art, the present application provides a polyurethane mixing head mixing chamber structure, in which two component feeds are arranged at a spatial angle to collide and mix the two raw materials so that the density and hardness of the final foamed product are uniform.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A polyurethane mixing head mixing chamber structure comprises a mixing cavity, which is a hexahedron, wherein two opposite sides of the mixing cavity are respectively provided with a channel opening, and symmetrical channels A and B are respectively provided in the two channel openings, and the ends of channels A and B are connected to a mixing pipe, and the angles between channels A and B and the horizontal are respectively 15 degrees, and the relative angle between channels A and B is 120 degrees, and feed ports A and B are respectively provided at the two channel openings, and the feed ports A and B are respectively connected to channels A and B through hole flow channels, and a discharge port connected to the mixing pipe is also provided on the mixing cavity, and two single-component raw materials are respectively pumped into channels A and B through feed ports A and B by metering pumps of a polyurethane foaming machine, enter the mixing pipe, collide and mix, and then discharge from the discharge port.

[0006] Furthermore, the A channel and the B channel respectively include a mounting fixture, a spray needle sleeve, a spray needle and a nozzle, the mounting fixture is installed at the channel mouth, the spray needle sleeve is installed in the mounting fixture, the spray needle is arranged in the spray needle sleeve, the nozzle is fixed to the end of the spray needle, and the spray needle sleeve, the spray needle and the nozzle form a tapered channel from large to small.

[0007] Furthermore, a bolt is inserted into the mounting fixture, one end of the bolt is connected to the spray needle, and the position of the spray needle is adjusted by the bolt.

[0008] Furthermore, the angles between the A channel, the B channel and the corresponding hole flow channel are 75 degrees respectively.

[0009] Furthermore, the hole flow channel is communicated with the interior of the spray needle sleeve.

[0010] Furthermore, a piston matching hole is provided on a side of the mixing chamber adjacent to the two channel openings, a cleaning piston is movably arranged in the piston matching hole, and the piston matching hole is communicated with the mixing pipe.

[0011] Furthermore, a mounting hole and a positioning pin hole of a guide component are also provided on one side where the piston matching hole is provided, the cleaning piston is guided by the guide component, and the guide component is positioned by the positioning pin hole.

[0012] The utility model uses the above technical solution, so that it has the following beneficial effects:

[0013] In the mixing chamber of the utility model, two raw materials are arranged in spatial angles, collided and mixed, and a high-speed turbulent state is formed, the mixing effect is good, and the density and hardness of the final foamed product are uniform, which has high practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional structural schematic diagram of the first and second embodiments of the utility model;

[0015] Figure 2 It is a three-dimensional structural schematic diagram of the first and second embodiments of the utility model from another angle;

[0016] Figure 3 It is a cross-sectional view of the position of the channel and the feed port in the first embodiment of the utility model;

[0017] Figure 4 It is a cross-sectional view from another angle of the first embodiment of the utility model;

[0018] Figure 5 A top view of the first embodiment of the utility model;

[0019] Figure 6 It is a schematic diagram of the spray needle sleeve structure in the first embodiment of the utility model.

[0020] The reference numerals in the accompanying drawings of the specification are as follows:

[0021] Mixing chamber 1, channel A 2, channel B 3, mixing pipeline 4, feed port A 5, feed port B 6, hole flow channel 7, mounting fixture 8, spray needle sleeve 9, spray needle 10, nozzle 20, bolt 30, piston matching hole 11, mounting hole 12, positioning pin hole 13, discharge port 41. DETAILED DESCRIPTION

[0022] In order to make the technical means, creative features, objectives and effects achieved by the utility model easier to understand, the utility model is further described below in conjunction with specific embodiments and drawings.

[0023] like Figures 1 to 4 As shown, the first embodiment of the utility model provides a polyurethane mixing head mixing chamber structure, including a mixing chamber 1, the mixing chamber 1 is a hexahedron, and the two opposite sides of the mixing chamber 1 are respectively provided with a channel opening, and the two channel openings are respectively provided with an A channel 2 and a B channel 3 symmetrical along the center line of the mixing chamber, and the ends of the A channel 2 and the B channel 3 are connected to the mixing pipe 4, and the angles between the A channel 2 and the B channel 3 and the horizontal are respectively 15 degrees, and the relative angle between the A channel 2 and the B channel 3 is 120 degrees, and the two channel openings A feed port 5 and B feed port 6 are respectively provided at the mixing chamber 1, and the A feed port 5 and B feed port 6 are respectively connected with the A channel 2 and the B channel 3 through the hole flow channel 7. The angle between the A channel 2, the B channel 3 and the corresponding hole flow channel 7 can be set to 75o. The mixing cavity 1 is also provided with a discharge port 41 connected with the mixing pipe 4. The two single-component raw materials are respectively pumped into the A channel 2 and the B channel 3 through the A feed port 5 and the B feed port 6 by the metering pump of the polyurethane foaming machine, enter the mixing pipe 4, and then collide and mix, and then discharge from the discharge port 41.

[0024] Specifically, combined with Figure 5 and Figure 6 As shown, channel A 2 and channel B 3 respectively include a mounting fixture 8, a needle sleeve 9, a needle 10 and a nozzle 20. The mounting fixture 8 is installed at the channel port and exposed to the outer surface of the mixing chamber 1. The needle sleeve 9 is installed in the mounting fixture 8, the needle 10 is arranged in the needle sleeve 9, and the nozzle 20 is fixed to the end of the needle 10. The needle sleeve 9, the needle 10 and the nozzle 20 form a tapered channel from large to small. Therefore, the hole flow channel 7 is connected to the interior of the needle sleeve 9, and the raw material is injected into the needle 10 from the hole flow channel 7.

[0025] In addition, a bolt 30 is inserted into the mounting fixture 8 , one end of the bolt 30 is connected to the spray needle 10 , and the position of the spray needle 10 is adjusted by the bolt 30 .

[0026] In specific use, the two single-component raw materials will be pumped into the A feed port 5 and the B feed port 6 on the side of the mixing chamber by the metering pump of the polyurethane foaming machine through the pipeline. The raw materials enter the hole flow channel 7 on the side of the spray needle sleeve 9 through the two feed ports, and then enter the inside of the spray needle sleeve 9 through the hole flow channel 7 on the side, and then enter the conical channel formed by the spray needle 10 and the nozzle 20, and enter the mixing pipe 4. The two raw materials collide and mix in a common pipe. The change of the raw material flow area from large to small can make the two components collide at high speed when mixing, and the mixed raw materials are discharged from the discharge port 41.

[0027] In summary, the polyurethane mixing head mixing chamber structure of the utility model arranges the two component feeds in a spatial angle layout for collision mixing to form a high-speed turbulent state, which has a good mixing effect and the final foamed product has uniform density and hardness.

[0028] The second embodiment of the present invention provides a polyurethane mixing head mixing chamber structure, and its technical features are basically the same as those of the first embodiment, and the main difference is that: Figure 1 and Figure 2 As shown, a piston matching hole 11 is provided on one side of the mixing chamber 1 adjacent to the two channel openings. The piston matching hole 11 is communicated with the mixing pipe 4. A cleaning piston (not shown in the figure) is movably arranged in the piston matching hole 11, that is, the cleaning piston reciprocates in the piston cleaning hole 11 to clean the interior. When the cleaning piston blocks the mixing pipe 4, the raw materials will not be mixed. In addition, a mounting hole 12 and a positioning pin hole 13 of a guide component (not shown in the figure) are also provided on the side provided with the piston matching hole 11. The cleaning piston is guided by the guide component, and the guide component is positioned by the positioning pin hole 13.

[0029] The above describes the specific embodiments of the utility model. It should be understood that the utility model is not limited to the above specific embodiments, and the devices and structures not described in detail should be understood to be implemented in a common manner in the art; those skilled in the art can make various modifications or modifications within the scope of the claims to make some simple deductions, deformations or substitutions, which does not affect the substantive content of the utility model.

Claims

1. A polyurethane mixing head mixing chamber structure, comprising a mixing cavity, the mixing cavity is a hexahedron, characterized in that: A channel opening is respectively provided on the two opposite sides of the mixing cavity, and symmetrical channels A and B are respectively provided in the two channel openings. The ends of channels A and B are connected to the mixing pipe. The angles between channels A and B and the horizontal are 15 degrees respectively, and the relative angle between channels A and B is 120 degrees. A feed port A and B feed port are respectively provided at the two channel openings. The feed port A and the feed port B are respectively connected to channels A and B through hole channels. A discharge port connected to the mixing pipe is also provided on the mixing cavity. Two single-component raw materials are respectively pumped into channels A and B through feed port A and feed port B by the metering pump of the polyurethane foaming machine, enter the mixing pipe, collide and mix, and then discharge from the discharge port.

2. The polyurethane mixing head mixing chamber structure according to claim 1, characterized in that: The A channel and the B channel respectively include a mounting fixture, a spray needle sleeve, a spray needle and a nozzle. The mounting fixture is installed at the channel opening, the spray needle sleeve is installed in the mounting fixture, the spray needle is arranged in the spray needle sleeve, and the nozzle is fixed to the end of the spray needle. The spray needle sleeve, the spray needle and the nozzle form a tapered channel from large to small.

3. The polyurethane mixing head mixing chamber structure according to claim 2, characterized in that: A bolt is inserted into the mounting fixture, one end of the bolt is connected to the spray needle, and the position of the spray needle is adjusted by the bolt.

4. The polyurethane mixing head mixing chamber structure according to claim 1, characterized in that: The angles between the A channel, the B channel and the corresponding hole flow channel are 75 degrees respectively.

5. The polyurethane mixing head mixing chamber structure according to claim 2, characterized in that: The hole flow channel is communicated with the interior of the spray needle sleeve.

6. The polyurethane mixing head mixing chamber structure according to claim 1, characterized in that: A piston matching hole is provided on a side of the mixing cavity adjacent to the two channel openings, a cleaning piston is movably arranged in the piston matching hole, and the piston matching hole is communicated with the mixing pipeline.

7. The polyurethane mixing head mixing chamber structure according to claim 6, characterized in that: The side provided with the piston matching hole is also provided with a mounting hole and a positioning pin hole of a guide component, the cleaning piston is guided by the guide component, and the guide component is positioned by the positioning pin hole.

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