CN113334677A

CN113334677A - Rotational flow stirring type mixing head

Info

Publication number: CN113334677A
Application number: CN202110527534.XA
Authority: CN
Inventors: 钟媛
Original assignee: Xi'an Zhiyuan Tuoxin Mechanical Equipment Co ltd
Current assignee: Xi'an Zhiyuan Tuoxin Mechanical Equipment Co ltd
Priority date: 2021-05-14
Filing date: 2021-05-14
Publication date: 2021-09-03

Abstract

The invention discloses a rotational flow stirring type mixing head, which comprises a mounting frame, wherein a spray head is fixed on the mounting frame, the spray head sequentially comprises an outer pipe, an intermediate pipe and a core rod which are coaxially arranged from outside to inside, a first annular channel is formed between the outer pipe and the intermediate pipe in a clearance fit manner, a second annular channel is formed between the intermediate pipe and the core rod in a clearance fit manner, an injection joint for injecting an A material and a B material to be mixed into the first annular channel and the second annular channel respectively is arranged on the spray head, a mixing pipe capable of rotating by a central shaft is coaxially arranged at one end of the spray head far away from the injection joint, and the discharge ports of the first annular channel and the second annular channel are provided with inclination angles towards the inner wall of the mixing pipe so that the discharge ports of the first annular channel and the second annular channel can obliquely spray the A material and the B material to the inner wall of the mixing pipe in an umbrella shape respectively; by adopting the rotational flow stirring type mixing head, the structure is simple, the weight is light, the manufacturing cost is low, the over-high pressure of the system is not needed, and the requirement on the foaming machine system is reduced.

Description

Rotational flow stirring type mixing head

Technical Field

The invention relates to a mixed pouring device for two liquid materials, in particular to a Polyurethane (PU) foaming mixing head.

Background

The polyurethane foaming mixing head is commonly used in a high-pressure mixing head in a high-pressure atomization opposite spraying mode and a low-pressure mixing head in a mechanical stirring mode. The high-pressure atomization opposite-spraying mixing head is used for a high-pressure foaming machine, the requirements on the conveying pressure of two materials are stable, and the pressure value is higher (generally greater than 7Mpa), so that the requirements on the conveying metering pump and the system control are higher. Because the opposite spraying and the opening and closing actions are completed under high pressure, the requirements on the material and the processing precision of the switch valve and the nozzle are very high, and the service life is limited. If the opposite spraying pressure is not balanced, the nozzle can be blocked by the mixed materials; the low-pressure mixing head is used for a low-pressure foaming machine, and a mechanical stirrer is arranged in a mixing chamber, so that the volume and the weight of a driving and driving stirring mechanism are large, and the mixing chamber needs to be purged by compressed air and washed by a solvent after each pouring. Both mixing heads are heavy (more than 30 KG). If a third material needs to be mixed, both mixing heads cannot be realized.

Disclosure of Invention

In order to solve the defects in the prior art, the rotational flow stirring type mixing head which does not need overhigh pressure and has a simple structure is provided, and the mixing head can be used for a high-pressure foaming machine and a low-pressure foaming machine. The technical scheme adopted by the invention is as follows:

the utility model provides a whirl stirring formula mixing head, includes the mounting bracket on be fixed with the shower nozzle, the shower nozzle by outer tube, intermediate tube and the plug that include coaxial setting in proper order to interior, outer tube and intermediate tube between clearance fit form first annular channel, intermediate tube and plug between clearance fit form the second annular channel the shower nozzle on be equipped with respectively to pour into the notes material joint of waiting to mix A material and B material in first annular channel and the second annular channel the shower nozzle keep away from to annotate the coaxial compounding pipe that can carry out the rotation with the axis that is equipped with of material joint one end, first annular channel and second annular channel discharge gate be equipped with the inclination that makes first annular channel and second annular channel discharge gate can be umbelliform slope with A material and B material respectively and spout the compounding pipe inner wall.

Furthermore, a mounting seat is fixed on the spray head, and a bearing for supporting the mixing pipe is arranged in the mounting seat.

Furthermore, the mounting frame on be connected with the mount pad in be equipped with the bearing that supports the mixing pipe, the mount pad cover establish on the shower nozzle.

Further, the mounting bracket on be equipped with drive mount pad along shower nozzle axial displacement's drive arrangement, work as the mount pad remove the time the shower nozzle can stretch into in the compounding pipe with the material of remaining on the compounding pipe inner wall strike off and release outside the compounding pipe the periphery that the shower nozzle is close to compounding pipe one end be equipped with the sealing washer.

Further, the driving device is a cylinder, a hydraulic cylinder or a lead screw.

Further, the mixing pipe is driven to rotate by a motor.

Furthermore, the mixing pipe is provided with blades, and the mixing pipe drives the blades to rotate through high-pressure airflow.

Further, annotate the material joint be hopper-shaped and inside be equipped with and annotate the material joint and separate into the baffle of two cavities annotate the material joint on be equipped with respectively and pour into the solenoid valve in two cavities with A material and B material respectively the shower nozzle with annotate a pair of feed inlet of material articulate and communicate with each other first annular channel and second annular channel with two cavities that have A material and B material with pouring into respectively.

Furthermore, the position of the mixing pipe, which is aligned with the discharge hole of the spray head, is provided with a chamfer for air flow to enter the mixing pipe, and the core rod is tubular and can feed C materials into the mixing pipe through the core rod.

The rotational flow stirring type mixing head is simple in structure, light in weight and low in manufacturing cost, does not need overhigh pressure of a system, greatly reduces the requirement on a foaming machine system, and has the advantages of reducing equipment purchasing cost, reducing production and operation cost and the like.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged view at E in FIG. 1;

FIG. 3 is a schematic view showing the material injection state in the mixing tube during the operation of the present invention;

fig. 4 is a sectional view of the injection joint in the direction of a-a.

Detailed Description

The mixing head as shown in fig. 1 comprises a mounting frame 1, a nozzle 2 is arranged on the mounting frame 1, the nozzle 2 comprises an outer tube 2-1, an intermediate tube 2-2 and a core rod 2-3 which are coaxially arranged from outside to inside in sequence, wherein the outer tube 2-1 and the intermediate tube 2-2 are in clearance fit to form a first annular channel 2-4, the intermediate tube 2-2 and the core rod 2-3 are in clearance fit to form a second annular channel 2-5, a material injection joint 3 is connected to the nozzle 2, the material injection joint 3 can inject two materials to be mixed into the first annular channel 2-4 and the second annular channel 2-5 in the nozzle 2 (for the convenience of distinguishing the material A and the material B, the material A and the material B are polyether polyol and isohydronate respectively by taking PU foaming material as an example, and the material A and the material B do not limit the positions of the channels, the two channels can be exchanged as long as the two channels flow in the first annular channel 2-4 and the second annular channel 2-5 separately), a mixing pipe 4 is coaxially arranged at one end of the spray head 2 far away from the material injection joint 3, the mixing pipe 4 can rotate around a central axis, as shown in figure 2, an inclined angle is arranged at the outlet of the discharge ports of the first annular channel 2-4 and the second annular channel 2-5 at one end of the mixing pipe 4, even if materials sprayed out of the first annular channel 2-4 and the second annular channel 2-5 can be obliquely sprayed on the inner wall of the mixing pipe 4, as the discharge ports of the first annular channel 2-4 and the second annular channel 2-5 are annular, the material A and the material B discharged from the discharge ports are sprayed on the inner wall of the mixing pipe 4 in an umbrella shape for a circle, as shown in figure 2, the material A and the material B sprayed are collided and sputtered on the inner wall of the mixing pipe 4 to realize primary mixing, the primarily mixed materials flow back to the center of the mixing pipe 4, and the mixture forms a rotational flow in the mixing pipe along with the rotation of the mixing pipe 4 as shown in fig. 3, so that the mixture is more uniformly mixed.

For easy to assemble mixing pipe 4, fixed mounting 5 on shower nozzle 2, this mount pad 5 is equivalent to the bearing frame, sets up the bearing 6 that supports mixing pipe 4 in mount pad 5, and concrete 4 outer lane installation jump ring retaining rings of mixing pipe block is in the play about the 6 lower extremes of bearing prevents mixing pipe 4 rotation in-process.

Of course, for the purpose of firm and stable installation, as shown in fig. 1, a mounting seat 5 is connected to the mounting frame 1, and unlike the way of installing the mounting seat 5, the mounting seat 5 is directly connected to the mounting frame 1 instead of installing the mounting seat 5 on the spray head 2, a bearing 6 is also arranged in the mounting seat 5 for supporting the mixing pipe 4, so that the mixing pipe 4 can rotate in the mounting seat 5. In order to further achieve the function of cleaning the mixing pipe 4 in the installation mode, the installation frame 1 is connected with the installation base 5 through the driving device 7, the hydraulic cylinder driving is shown in fig. 1 and can also be set as a motor lead screw for driving, the installation base 5 can move axially along the spray head 2 through the driving device 7, the mixing pipe 4 can only rotate but cannot move axially in the installation base 5, so the mixing pipe 4 can also move axially when the installation base 5 moves axially through the driving device 7, the spray head 2 can extend into the mixing pipe 4, the foaming material which is not discharged is still remained on the inner wall of the mixing pipe 4 when the mixing work is finished, the foaming material can foam in the mixing pipe 4 if the cleaning is not carried out in time, the mixing pipe is blocked, the next mixing work is influenced, and the spray head 2 is inserted into the mixing pipe 4 by driving the mixing pipe 4 to move through the driving device 7 after the spray head 2 finishes spraying, push away the material push mixing tube 4 through 2 tip piston types of shower nozzle on 4 inner walls of mixing tube to remaining material to reach the function of clearance mixing tube 4. In order to further improve the cleaning function, the periphery of one end, close to the mixing pipe 4, of the spray head 2 is provided with a sealing ring 2-6, when residual materials on the inner wall of the mixing pipe 4 are scraped, the sealing ring 2-6 can be in close contact with the inner wall of the mixing pipe 4, and the inner wall of the mixing pipe 4 is better cleaned through the sealing ring 2-6.

In the above structure, the mixing pipe 4 is indicated to be capable of rotating, and the embodiment shown in the figure is that the mixing pipe 4 is rotated by high-pressure air flow, that is, the blades 8 are arranged on the outer wall of the mixing pipe 4, and the blades 8 are driven by the high-pressure air flow to rotate the mixing pipe 4. Of course, only one embodiment is shown, and the mixing pipe 4 can be driven to rotate by a motor through a chain, a belt or a gear.

Fig. 1 also shows a structure of the material injection joint 3, which is funnel-shaped, as shown in fig. 4, a partition plate 9 is arranged in the material injection joint 3 to divide the interior of the material injection joint 3 into two chambers, and the two chambers are respectively injected with two materials of material a and material B through two solenoid valves 10 arranged on the material injection joint 3, in the structure, a pair of feed inlets of the spray head 2 is arranged, the pair of feed inlets are respectively opposite to the two divided chambers, and the two feed inlets are respectively communicated with the first annular channel 2-4 and the second annular channel 2-5, so that the material a and the material B can be introduced into the first annular channel 2-4 and the second annular channel 2-5 from the respective chambers, in order to enable the material a and the material B to flow rapidly and smoothly, as shown in fig. 4, the feed inlets on the spray head 2 are arranged in a similar form, and each feed inlet is arranged in a separate chamber, thereby avoiding two materials from entering the same annular channel. Of course, the material injection joint 3 is not limited to the above structure, and different materials can be injected into different annular channels by respectively connecting corresponding feeding pipes into the first annular channels 2-4 and the second annular channels 2-5, and the change of the structural form of the material injection joint 3 falls within the protection scope.

Since some mixing may require the addition of a third material C (e.g., glass fiber as C in the foam), the core rod 2-3 may be configured in a tubular shape, the third material may be added and mixed by introducing C into the core rod 2-3, and the three materials may be fully mixed by the swirling action of the material a and the material B after the material C is injected into the mixing tube 4 through the core rod 2-3. That is, as shown in fig. 1, the core rod 2-3 is a tubular feeding end with one end extending out of the material injection joint 3, and the feeding pipe is connected to the feeding pipe for adding when the material C needs to be added, and the material C does not need to be added, and the mixing of the material A and the material B is not affected.

In order to avoid shower nozzle 2 when spraying A material and B material, the material is from mixing pipe 4 upper end spill, can avoid material sputter mixing pipe 4 through establishing mixing pipe 4 cover at shower nozzle 2 front end, but clearance fit leaves the gap between mixing pipe 4 and the shower nozzle 2, in order to avoid the material to remain in the gap, can blow the realization clearance with the material from mixing pipe 4 upper portion downwards through letting in high-pressure gas from mixing pipe 4 upper end opening part, reach the effect of pay-off simultaneously, it is direct can realize through the rotatory structure of pneumatic drive mixing pipe 4 under this kind of structure, and drive the rotatory structure of mixing pipe 4 through the motor then need blow in the independent intake pipe of mixing pipe 4 top installation realization. And for better air inlet, as shown in fig. 2, during operation, the overlapping part of the end part of the spray head 2 and the mixing pipe 4 is in clearance fit, and the aligning part of the end part of the mixing pipe 4 and the spray head 2 is provided with a chamfer 11 to reserve an enough air inlet space, so that air flow can enter the mixing pipe 4 conveniently to achieve a better air blowing effect, and the structure is selected as a better structure.

Claims

1. The utility model provides a whirl stirring formula mixing head, includes mounting bracket (1) on be fixed with shower nozzle (2), its characterized in that: the spray head (2) sequentially comprises an outer pipe (2-1), an intermediate pipe (2-2) and a core rod (2-3) which are coaxially arranged from outside to inside, the outer pipe (2-1) and the intermediate pipe (2-2) are in clearance fit to form a first annular channel (2-4), the intermediate pipe (2-2) and the core rod (2-3) are in clearance fit to form a second annular channel (2-5), a material injection joint (3) for injecting a material A to be mixed and a material B to be mixed into the first annular channel (2-4) and the second annular channel (2-5) is arranged on the spray head (2), a material mixing pipe (4) capable of rotating along a central axis is coaxially arranged at one end, far away from the material injection joint (3), of the spray head (2), of the first annular channel (2-4) and a discharge hole of the second annular channel (2-5) are provided with a material facing the material mixing pipe (4) ) The inclination angle of the inner wall enables the discharge ports of the first annular channel (2-4) and the second annular channel (2-5) to respectively and obliquely spray the material A and the material B to the inner wall of the mixing pipe (4) in an umbrella shape.

2. A swirl-agitated mixing head according to claim 1, in which: the sprayer is characterized in that a mounting seat (5) is fixed on the sprayer (2), and a bearing (6) for supporting the mixing pipe (4) is arranged in the mounting seat (5).

3. A swirl-agitated mixing head according to claim 1, in which: the mounting frame (1) on be connected with mount pad (5) in be equipped with bearing (6) that support mixing tube (4), mount pad (5) cover establish on shower nozzle (2).

4. A swirl mixing head according to claim 3, characterised in that: mounting bracket (1) on be equipped with drive mount pad (5) along shower nozzle (2) axial displacement's drive arrangement (7), work as mount pad (5) remove when shower nozzle (2) can stretch into in mixing pipe (4) with the material of remaining on mixing pipe (4) inner wall strike off and push out mixing pipe (4) outside shower nozzle (2) be close to the periphery of mixing pipe (4) one end and be equipped with sealing washer (2-6).

5. A swirl mixing head according to claim 4, characterised in that: the driving device (7) is a cylinder, a hydraulic cylinder or a lead screw.

6. A swirl mixing head according to any one of claims 1 to 4 characterised in that: the mixing pipe (4) is driven to rotate by a motor.

7. A swirl mixing head according to any one of claims 1 to 4 characterised in that: the mixing pipe (4) is provided with blades (8), and the mixing pipe (4) drives the blades (8) to rotate through high-pressure airflow.

8. A swirl mixing head according to any one of claims 1 to 4 characterised in that: annotate material joint (3) be and leak hopper-shaped and inside be equipped with and annotate material joint (3) and separate into baffle (9) of two cavities annotate material joint (3) on be equipped with respectively and annotate material and B material solenoid valve (10) in two cavities of pouring into respectively shower nozzle (2) and annotate material joint (3) be connected a pair of feed inlet and communicate with each other first annular channel (2-4) and second annular channel (2-5) and two cavities that have A material and B material of pouring into respectively.

9. A swirl-agitated mixing head according to claim 1, in which: a chamfer (11) for air flow to enter the mixing pipe (4) is arranged at the aligned position of the mixing pipe (4) and the discharge hole of the spray head (2), and the core rod (2-3) is tubular and can feed C materials into the mixing pipe (4) through the core rod (2-3).