KR20040009992A - Polyurethane mixing head assembly for foaming. - Google Patents

Abstract

PURPOSE: A mixing head assembly for polyurethane foaming is provided to simplify the structure of the polyurethane foam mixing head assembly, and to improve precision of the same, thereby making possible of the injection of a precise amount of material. CONSTITUTION: The mixing head assembly for polyurethane foaming includes a raw material tub, a center block(3), a mixing chamber(4), an impeller, raw material supply adjusting block assemblies, a cleanser input, and an injection nozzle(8). Four of the raw material supply adjusting block assemblies and the cleanser input are radially positioned around the mixing chamber(4) at a fixed angle. Isocyanate is provided to two raw material supply adjusting block assemblies, and polyol is provided to the other two raw material supply adjusting block assemblies. A link(14) is linked to the top of a shaft of the impeller, and the other side of the link(14) is connected to a pneumatic cylinder(15).

Description

Polyurethane mixing head assembly for foaming. {Omitted}

Polyurethane foam, which has been used for a long time, is mainly applied to light industry such as furniture (chair), bedding, shoes, toys, etc., but in recent years, it is widely used as a material for automobiles, and in the case of hard insulation It is the best energy-saving material with self-adhesiveness, soundproofing and anti-condensation. It is used in various fields such as general construction and refrigerated warehouses.

The polyurethane is a mixture of materials such as polyol and isocyanate, but a conventional apparatus capable of producing only a single color has a three-head type attached to two raw material supply control block assemblies and one cleaning solvent input device. In this, isocyanator is supplied to one of the two supply control block assemblies, isocyanator is supplied to one of the two supply supply control block assemblies, and polyol is supplied to the other one of the supply control block assemblies to impart an appropriate amount of the mixing chamber to impregnate the mixing chamber. The solution is mixed by the rotation of, and the solution mixed with the isocyanator and the polyol is introduced into the mold through the injection nozzle and foamed to complete the product. However, since the three-head type can produce only a single color product, there is a problem that one additional machine must be installed to produce two color products.

Another prior art which improves the problem of the three-head type is a four-head type in which three raw material supply control block assemblies and one washing solvent input device are configured in the center block. Looking at this, there is one raw material supply control block assembly to which isocyanator is supplied, and two raw material supply control block assemblies to which polyol 1 and polyol 2 are supplied and a cleaning solvent input device are formed in the center block. Produce a product. Isocyanator and polyol 1 are added to the mixing chamber inside the center block, mixed by impeller, and injected into the mold through the injection nozzle to make a primary product, and then mixed with isocyanator and polyol 2 to give another color. Is put into the mold to produce products with two colors. At this time, the raw material supply control block assembly supplied with the polyol 1 and the raw material supply control block assembly supplied with the polyol 2 may be opened and closed, and a washing solvent may be added to wash the inside of the mixing chamber. .

However, the four-head type has a problem in that it is impossible to produce a product having a double color and a double density. In order to produce a product with a double density, isocyanators with different viscosities must be supplied. That is, isocyanator 1 and polyol 1 are mixed and introduced into a mold to make a primary product, and then a mixed solution of isocyanator 2 and polyol 2 is added to the mold to produce a finished product having a double color and a double density.

Accordingly, the present invention is to provide a polyurethane mixing head assembly for foaming, in order to produce a product having a double color and a double density, a simple structure, excellent precision and precisely and simply control the amount of injection of raw materials.

1 is an assembly view of a mixing head in a state in which three conventional raw material supply control block assemblies are assembled in a center block;

2 is an assembly view of a mixing head in a state in which four raw material supply control block assemblies of the present invention are assembled to a center block;

3 is a front view of the present invention

Figure 4 is a longitudinal sectional view of the raw material supply amount control block assembly of the present invention

5 is an exploded perspective view of a raw material supply control block assembly of the present invention;

Figure 6 is a longitudinal cross-sectional view of the impeller and injection nozzle of the present invention assembled to the center block

7 illustrates an embodiment of the present invention.

<Description of the code | symbol about the principal part of drawing>

1: raw material container 2: raw material supply line

3: center block 4: mixing room

5: impeller 6: raw material supply control block assembly

7: cleaning solvent injection device 8: injection nozzle

9: Raw material injection room 10: Pneumatic operation room

11: adjusting pin 12: operating plate

13: load 14: link

15: pneumatic cylinder

In the description of the present invention, only parts necessary for understanding the operation according to the present invention will be described, and descriptions of other parts will be omitted so as not to distract from the gist of the present invention.

The present invention is the raw material is supplied by the raw material through the raw material supply line, the raw material in the mixing head assembly consisting of a center block, mixing chamber (impeller), impeller, raw material supply control block assembly, cleaning solvent injection device and injection nozzle In the foam molding machine for injecting the polyurethane foam for mixing into a mold, etc., the four raw material supply control block assembly and one cleaning solvent input device is radially around the mixing chamber at equal angles at regular intervals. Two of the feed control block assemblies are supplied with isocyanators and the other two of the feed control block assemblies are supplied with polyols to provide one mixing head assembly for the dual color and dual density of the product. Can be produced using

In addition, the link is connected to the upper part of the rotary shaft of the impeller, the other side of the link is connected to the rod of the pneumatic cylinder, it is possible to move the rotary shaft of the impeller downward with the pneumatic cylinder, as a result the lower end of the impeller injection nozzle as needed It relates to a foaming polyurethane mixing head assembly, characterized in that the opening and closing.

The polyurethane is a mixture of materials such as polyol and isocyanate, but the conventional apparatus capable of producing only a single color has two raw material supply control block assemblies attached thereto. Looking at this, a cylinder having a piston is installed in the frame, the lower side of the frame and the side block is assembled to both sides, the side block is assembled with the tubular body, respectively. A bracket is assembled below the piston and a chuck is assembled to the bracket. Each of the chuck bites the adjustment pin, the jaw of the adjustment pin is inserted into the groove of the ball valve assembled in the side block to rotate the ball valve. And the ball valve is formed with a passage that intersects. That is, the assembly including the ball valve and the tube control pin corresponds to the raw material supply control block assembly.

In this state, the raw material is injected through the raw material injection hole of the side block, but by operating the cylinder to move the piston up and down, the chuck turns the control pin in the left and right direction. Of course, the hose is connected to the pipe and the hose is naturally connected to the raw material tank. If the piston is operated to change the position of the ball valve from side to side while the raw material is being injected as described above, if the passage of the ball valve and the position of the ball valve are changed from side to side, the position of the passage of the ball valve and the hole of the ball seat In this way, all the raw material injected through the raw material injection hole cannot pass through the center block, and some of the raw material escapes to the tubular body and returns to the raw material tank. Therefore, the amount of raw material injected into the center block is controlled.

By the way, the conventional device is difficult to maintain the precision in manufacturing the ball valve and the processing is difficult to increase the production cost, as well as a high incidence of defects, the production of the ball seat is also difficult to process to maintain the tolerance with the ball valve Along with the hard problem, there is a disadvantage that requires very skilled skills when assembling. If the ball valve and the ball seat are not assembled correctly, the amount of injection of raw materials is not precisely controlled, which leads to the closure of defects due to the failure to obtain the desired product. The problem could not be overlooked. In addition, the orifice must be assembled at the rear of the ball valve, but the orifice is a component that can not be omitted in the conventional apparatus because the mixing amount of the raw material is controlled by the hole size of the orifice. By the way, the orifice has an inconvenience of having to replace the different sizes according to the mixing ratio of the raw materials, and an uneconomical and unreasonable problem of disassembling and reassembling the side block when replacing the orifice. It became.

Another conventional technique that improves this is a technology related to the mixing head that can mix the raw material of the composite color, the raw material of the composite color is compounded with three raw material supply control block assembly and one cleaning solvent input device assembled in the center block The mixing head which can be made is shown. Since the conventional apparatus is not a 4-head type | system | group, the raw material of complex color cannot be mix | blended. The rear cleaning solvent injection device is a device for injecting the cleaning solvent for cleaning the raw materials remaining in the device after the operation, which is formed in the same configuration as the conventional device. In the raw material injection hole, a hose connected to the raw material tank is assembled to the screw hole, and an air hose is connected to the hole under the cylinder. The above hose connection configuration is omitted in the drawings. On the other hand, in the hole of the raw material supply control block assembly body, the pin is assembled and the raw material discharge piston assembled with the pin is pulled to the far left in the raw material discharge cylinder. At this time, the protruding ring of the pin is pulled to the left end of the raw material injection hole, and the end of the adjusting rod opens the passage completely. This condition is the same for all three control block assemblies. In this state, when each raw material is injected through each raw material injection hole, the injected raw material passes through the raw material injection hole, passes through the hole of the body, and is injected into the space portion of the center block through the hole of the hinge, and then mixed The raw material is discharged through the discharge pipe while being sufficiently mixed by the impeller rotation, which is injected into the processing mold and processed.

However, the raw material injected at high pressure through the raw material injection hole is injected into the center block through the hole of the body and the hole of the hinge, but due to the opposite pressure generated, some raw materials are also injected into the passage through the menstrual ring of the pin. This is reduced back to the raw material tank through the passage. Therefore, if you adjust the amount of raw material injection, you can turn the control rod so that the end of the control rod blocks the passage. If the passage is almost closed, the amount of raw material that is reduced becomes very small. The more the raw material is injected, the less. Therefore, when the control rod assembly of each control block assembly is appropriately adjusted to adjust the reduction amount of the raw material, the mixing ratio of each raw material is controlled.

In addition, when mixing only the raw materials of a single color rather than a complex color, one of the three control block assemblies must be sealed. In this case, air pressure is applied to one of the control block assemblies. Make sure to seal the holes in the hinges.

In addition, when the work is finished and the raw material remaining inside the mixing head is cleaned, air pressure is applied to the entire piston as described above, so that the cylindrical end of the pin seals the hole of the entire hinge, and then the cleaning solvent is added. By spraying the cleaning solvent at high pressure into the device and rotating the impeller at high speed, the inside and outside of the center block and impeller are cleaned. Then, in the following work, applying air pressure through a hose connected to a hole in the body causes the piston to return to its original position, thereby opening the hole of the hinge. In this state, the compounding action of the raw materials can be performed again as described above.

As described above, the above-described invention makes the injection and blocking of the raw material by the sealing action of the pin and the hinge, and can adjust the amount of the raw material by arbitrarily rotating the adjusting rod.

However, the conventional invention as described above has a limitation of the invention in which it is difficult to produce a double-density polyurethane product by simply mixing colors with multiple colors at the same density.

Accordingly, the present invention is to provide a polyurethane mixing head assembly for foaming, which is simple in structure for changing color of multi-color and can change its density, excellent in precision, and precisely and simply controlling the amount of injection of raw materials.

2 shows a mixing head capable of selectively blending raw materials of different colors and different viscosities while the four raw material supply control block assemblies and the cleaning solvent injection device are assembled in the center block. -Because it is not head type, it is not possible to mix raw materials of complex color and different viscosity. The cleaning solvent injection device is a device for injecting the cleaning solvent for cleaning the raw materials remaining in the device after the operation, which is formed in the same configuration as the conventional device. In the raw material injection hole, a hose connected to the raw material tank is assembled to the screw hole, and an air hose is connected to the hole under the cylinder. And a screw hole connected to the passage is assembled with a hose connected to the raw material tank. The above hose connection configuration is omitted in the drawings.

In addition, when mixing raw materials of only one color rather than complex colors or raw materials having only one type of viscosity, one or two or more control block assemblies should be sealed selectively among four control block assemblies. The pneumatic pressure is applied to the control block assembly of the cylinder, which pushes the raw material discharge piston so that the cylindrical end of the pin seals the hole through the mixing chamber of the center block.

In addition, when the work is finished and the raw material remaining inside the mixing head is cleaned, air pressure is applied to the entire piston as described above so that the cylindrical end of the pin seals the entire hole, and then is cleaned into the cleaning solvent injection device. The solvent is sprayed at high pressure and the impeller is rotated at high speed to clean the inside and outside of the center block and impeller. Then, in the next work, when the air pressure is applied through the hose connected to the air chamber hole of the control block assembly, this causes the piston to return to its original position, thus opening the hole connected to the center block. In this state, the compounding action of the raw materials can be performed again as described above.

In addition, the present invention is supplied to the raw material by the raw material passage raw material supply pipe, the raw material in the mixing head assembly consisting of a mixing chamber (impeller), raw material supply control block assembly, cleaning solvent injection device and injection nozzles In the foam molding machine which mixes and injects the foamed polyurethane into the mold,

The four raw material supply control block assembly and one washing solvent input device are arranged at regular intervals at regular angles in a radial shape around the mixing chamber, two of the raw material supply control block assembly is supplied with an isocyanator, Two of the raw material supply control block assemblies are supplied with a polyol, but two pipes are connected to the raw material supply control block assembly to which the isocyanator and the polyol are supplied, and one pipe is connected to the washing solvent input device. The present invention relates to a polyurethane mixing head assembly for foam, characterized in that the product can be produced with a single mixing head even with a dual color of the product.

The reason why two pipes are connected to the assembly to which the polyol is supplied is to continuously circulate to prevent the polyol from solidifying in the assembly or raw material supply line.

Looking at the raw material mixing system, the isocyanator 1 and the polyol 1 are mixed to form a foaming material liquid with one color and density, that is, two assembly blocks for supplying raw materials are operated, and the isocyanator 2 and the polyol 2 are operated. Is mixed to form a foamed stock solution of another color and density, that is, two other raw material supply control block assemblies are operated, and one cleaning solvent input device is installed to operate the combination. The combination of the above is possible by adjusting the number of operation of the raw material feed amount control block assembly by combining one color and two viscosity and two color and one viscosity as necessary. In addition, the raw material mixed in the mixing chamber should be discharged through the discharge pipe within 6 ~ 8 seconds, the discharge rate through the discharge pipe is 10 ~ 20g / sec, 30 ~ 50g / sec, 100g / sec depending on the working conditions Speed, which is possible by adjusting the diameter of the nozzle.

In addition, the raw material discharge piston of the raw material supply control block assembly is separately divided into a raw material injection chamber and a pneumatic operation chamber for applying air pressure to the raw material, the control pin of the raw material injection chamber and the operating plate of the pneumatic operation chamber is connected by a rod In addition, the pneumatic operation chamber is connected to the front and rear of the operating air inlet and exhaust air pipes are installed in the front and rear of the operating plate by the inlet and out of the air and the control pins connected thereto are simultaneously moved forward and backward. Therefore, the raw material is injected into the cylinder as the injection plate advances back and forth. This structure is unlike the conventional cylinder device, even if the raw material leaks in the direction of the pneumatic operation chamber inside the raw material injection chamber, because the material is formed separately from the pneumatic operation chamber, there is no fear that the raw material will leak into the pneumatic operation chamber, so Even if strong raw material leaks, the operation of the adjusting pin is guaranteed. That is, in the conventional one-piece type, when the raw material leaks in the pneumatic operation chamber, the springs, etc. intervened in the pneumatic operation chamber are corroded, or the raw material hardens in the pneumatic operation chamber, thereby failing to perform a proper function. I can solve it.

In addition, as shown in Figures 3 and 6, a link is connected to the upper portion of the rotary shaft of the impeller, the other side of the link is connected to the rod of the pneumatic cylinder, it is possible to downward movement of the rotary shaft of the impeller with the pneumatic cylinder As a result, the lower end of the impeller can be configured to open and close the injection nozzle as necessary, thereby preventing the mixed solution remaining in the mixing chamber from accidentally falling into the mold and causing a defective product. .

The four control block assembly, the cleaning solvent injection device, the pneumatic cylinder and the impeller motor are appropriately controlled by a control unit that is configured separately, which is a well-known technique that is implemented by those skilled in the art and will not be described in detail.

Due to the vortex and turbulence phenomenon, the mixing efficiency in the mixing chamber is improved, and the mixing piston's throttle adjusting device improves the mixing efficiency in the mixing chamber and the laminar flow is smooth in the discharge tube, thereby producing high-quality polyurethane foam. In addition, even the dual color and dual density of the product can be produced with one mixing head, which can reduce the initial investment of equipment, increase the use efficiency of the equipment, and save energy.

Claims (3)

The raw material is supplied by the raw material container (1) and the raw material supply line (2), and the center block (3), the mixing chamber (4), the impeller (5), the raw material supply control block assembly (6), In the foam molding machine for mixing the raw material in the mixing head assembly composed of the cleaning solvent injection device (7) and the injection nozzle (8) and injecting the foamed polyurethane into the mold, etc. Four raw material supply control block assembly (6) and one washing solvent injection device (7) are arranged at regular intervals in a radial shape around the mixing chamber (4), the raw material supply control block assembly (6) 2) isocyanator is supplied, and 2 of the raw material supply control block assembly (6) are supplied with polyol, so that the foam can be produced with one mixing head even in the dual color and dual density of the product. Polyurethane mixing head assembly. The raw material is supplied by the raw material container (1) and the raw material supply line (2), and the center block (3), the mixing chamber (4), the impeller (5), the raw material supply control block assembly (6), In a foam molding machine for mixing the raw material in the mixing head assembly consisting of a cleaning solvent injection device (7) and the injection nozzle (8) and injecting the foamed polyurethane into the mold, etc. The raw material supply control block assembly 6 is divided into a raw material injection chamber 9 and a pneumatic operation chamber 10 for applying air pressure to the raw material, respectively, the control pin 11 and the pneumatic operation of the raw material injection chamber 9. The operating plate 12 of the chamber 10 is connected by a rod 13, and the pneumatic operation chamber 10 is connected to the front and rear of the operating plate by the inlet and exhaust air pipes, Polyurethane mixing head assembly for foaming, characterized in that the operating plate 12 is moved forward and backward and the control pin 12 connected to it is moved forward and backward at the same time. The raw material is supplied by the raw material container (1) and the raw material supply line (2), and the center block (3), the mixing chamber (4), the impeller (5), the raw material supply control block assembly (6), In the foam molding machine for mixing the raw material in the mixing head assembly composed of the cleaning solvent injection device (7) and the injection nozzle (8) and injecting the foamed polyurethane into the mold, etc. The link 14 is connected to an upper part of the rotating shaft of the impeller, and the other side of the link 14 is connected to the rod of the pneumatic cylinder 15 so that the rotating shaft of the impeller 5 is moved up and down by the operation of the pneumatic cylinder 15. And a lower end face of the impeller 5 coupled to the rotary shaft as a result of which the injection nozzle 8 is opened and closed as necessary.