A swirl stirring mixing head

By designing a swirl stirring mixing head, the uniform mixing of polyurethane materials is achieved by using rotating and high-pressure airflow, the problems of material blockage and heavy weight in the prior art are solved, the equipment cost is reduced, and the addition of the third material is supported to achieve Efficient mixing of multiple materials.

CN113334677BActive Publication Date: 2025-01-03XIAN ZHIYUAN TUOXIN MECHANICAL EQUIP CO LTD
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Patent Information

Application Number
CN202110527534.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2021-05-14
Publication Date
2025-01-03
Estimated Expiration
2041-05-14

AI Technical Summary

Technical Problem

The existing polyurethane foam mixing heads have problems such as material blockage, large structural weight, and inability to mix the third type of material under high and low pressure conditions, resulting in high equipment procurement and operation costs.

Method used

A swirl stirring mixing head is designed, adopting a coaxial nozzle and mixing pipe structure, so that the material is uniformly mixed through rotation and high-pressure air flow, and the cleaning function of the nozzle and mixing pipe is realized through the driving device, supporting the third type Adding materials.

Benefits of technology

It achieves a mixing effect of simple structure, light weight and low cost without high pressure, reduces equipment procurement and operation costs, and supports the mixing of multiple materials.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention discloses a swirl stirring type mixing head, comprising a mounting frame, on which a nozzle is fixed, the nozzle comprising, from outside to inside, a coaxially arranged outer tube, an intermediate tube and a core rod, the outer tube and the intermediate tube are gap-matched to form a first annular channel, the intermediate tube and the core rod are gap-matched to form a second annular channel, an injection joint is provided on the nozzle for respectively injecting material A and material B to be mixed into the first annular channel and the second annular channel, a mixing tube which can rotate about a central axis is coaxially provided at one end of the nozzle away from the injection joint, the first annular channel and the second annular channel material outlets are provided with an inclination angle toward the inner wall of the mixing tube so that the first annular channel and the second annular channel material outlets can respectively spray material A and material B onto the inner wall of the mixing tube in an umbrella shape; the above-mentioned swirl stirring type mixing head has a simple structure, light weight, low manufacturing cost, does not require excessively high system pressure, and reduces the requirements for the foaming machine system.
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Description

Technical Field

[0001] The invention relates to a device for mixing and pouring two liquid materials, in particular to a polyurethane (PU) foaming mixing head. Background Art

[0002] Polyurethane foam mixing heads usually use high-pressure atomizing spraying and low-pressure mixing heads with mechanical stirring. High-pressure atomizing spraying mixing heads are used in high-pressure foaming machines. The conveying pressure of the two materials is required to be stable and the pressure value is relatively high (generally greater than 7Mpa), so the conveying metering pump and system control requirements are higher. Since the spraying and switching actions are completed under high pressure, the material and processing accuracy of the switch valve and nozzle are very high, and the service life is limited. If the spraying pressure is unbalanced, the nozzle will be blocked by cross-materials; low-pressure mixing heads are used in low-pressure foaming machines. Since a mechanical agitator is installed in the mixing chamber, the drive and transmission stirring mechanism is large in size and weight, and the mixing chamber needs to be purged with compressed air and then rinsed with solvent after each pouring. Both mixing heads are heavy (greater than 30KG). If a third material needs to be mixed, these two mixing heads cannot be used. Summary of the invention

[0003] In order to solve the deficiencies in the prior art, a swirl stirring mixing head is provided which does not require excessive pressure and has a simple structure. The mixing head can be used in both high-pressure foaming machines and low-pressure foaming machines. The technical solution adopted by the present invention is:

[0004] A swirl stirring mixing head comprises a mounting frame, a nozzle is fixed on the mounting frame, the nozzle comprises a coaxially arranged outer tube, an intermediate tube and a core rod from outside to inside, the outer tube and the intermediate tube are clearance-matched to form a first annular channel, the intermediate tube and the core rod are clearance-matched to form a second annular channel, an injection joint is provided on the nozzle for respectively injecting material A and material B to be mixed into the first annular channel and the second annular channel, a mixing tube capable of rotating about a central axis is coaxially provided at one end of the nozzle away from the injection joint, the first annular channel and the second annular channel discharge ports are provided with an inclination toward the inner wall of the mixing tube so that the first annular channel and the second annular channel discharge ports can respectively spray material A and material B in an umbrella-shaped inclined manner onto the inner wall of the mixing tube.

[0005] Furthermore, a mounting seat is fixed on the nozzle, and a bearing for supporting the mixing tube is arranged inside the mounting seat.

[0006] Furthermore, a mounting seat is connected to the mounting frame, a bearing for supporting the mixing tube is arranged in the mounting seat, and the mounting seat is sleeved on the nozzle.

[0007] Furthermore, a driving device is provided on the mounting frame to drive the mounting seat to move along the axial direction of the nozzle. When the mounting seat moves, the nozzle can extend into the mixing tube to scrape off the material remaining on the inner wall of the mixing tube and push it out of the mixing tube. A sealing ring is provided on the outer periphery of the nozzle near one end of the mixing tube.

[0008] Furthermore, the driving device is a cylinder, a hydraulic cylinder or a lead screw.

[0009] Furthermore, the mixing tube is driven to rotate by a motor.

[0010] Furthermore, the mixing tube is provided with blades, and the mixing tube drives the blades to rotate through the high-pressure airflow.

[0011] Furthermore, the injection joint is funnel-shaped and is provided with a partition inside to divide the injection joint into two chambers. The injection joint is provided with solenoid valves to inject material A and material B into the two chambers respectively. A pair of feed ports are connected between the nozzle and the injection joint to connect the first annular channel and the second annular channel with the two chambers injected with material A and material B respectively.

[0012] Furthermore, a chamfer is provided at the position where the mixing tube is aligned with the nozzle outlet for air flow to enter the mixing tube, and the core rod is tubular and the C material can be fed into the mixing tube through the core rod.

[0013] The above-mentioned swirl stirring mixing head has a simple structure, light weight, low manufacturing cost, does not require excessive system pressure, greatly reduces the requirements for the foaming machine system, and has the advantages of reducing equipment procurement costs and reducing production and operation costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the present invention;

[0015] Figure 2 for Figure 1 Enlarged view at E in the middle;

[0016] Figure 3 This is a schematic diagram of the material injection state in the mixing tube when the present invention is working;

[0017] Figure 4 This is a cross-sectional view of the injection joint in the AA direction. DETAILED DESCRIPTION

[0018] like Figure 1The mixing head shown includes a mounting frame 1, on which a nozzle 2 is arranged. The nozzle 2 includes, from outside to inside, a coaxially arranged outer tube 2-1, an intermediate tube 2-2 and a core rod 2-3, wherein the outer tube 2-1 and the intermediate tube 2-2 are gap-fitted to form a first annular channel 2-4, and the intermediate tube 2-2 and the core rod 2-3 are gap-fitted to form a second annular channel 2-5. An injection joint 3 is connected to the nozzle 2, and the injection joint 3 can inject two materials to be mixed (herein, for the convenience of distinction, referred to as A material and B material, taking PU foam material as an example, A material and B material are polyether polyol and isocyanate, respectively, and A material and B material are not limited to the channel positions, and the two can interchange channels, as long as the two are separated and flowed through the first annular channel 2-4 and the second annular channel 2-5). A mixing tube 4 is coaxially arranged at the end of the nozzle 2 away from the injection joint 3, and the mixing tube 4 can rotate about the central axis, such as Figure 2 As shown in the figure, the outlets of the first annular channel 2-4 and the second annular channel 2-5 are provided with an inclination angle at the outlet at one end of the mixing tube 4, so that the materials ejected from the first annular channel 2-4 and the second annular channel 2-5 can be tilted and sprayed onto the inner wall of the mixing tube 4. Since the outlets of the first annular channel 2-4 and the second annular channel 2-5 are annular, the A material and the B material exiting the outlets are sprayed onto the inner wall of the mixing tube 4 in an umbrella shape. Figure 2 As shown in the figure, the sprayed material A and material B are initially mixed by mutual collision and splashing on the inner wall of the mixing tube 4, and the initially mixed materials flow back toward the center of the mixing tube 4, as shown in the figure. Figure 3 As shown, the mixing tube 4 rotates to form a vortex in the mixing tube, and the mixing is more uniform.

[0019] To facilitate the installation of the mixing tube 4, a mounting seat 5 is fixed on the nozzle 2, and the mounting seat 5 is equivalent to a bearing seat. A bearing 6 supporting the mixing tube 4 is arranged in the mounting seat 5. Specifically, a retaining ring is installed on the outer ring of the mixing tube 4 and is clamped at the lower end of the bearing 6 to prevent the mixing tube 4 from moving up and down during rotation.

[0020] Of course, in order to install firmly and securely, Figure 1 As shown in the figure, the mounting frame 1 is connected to the mounting seat 5. Different from the mounting seat 5 in the above, the mounting seat 5 is directly connected to the mounting frame 1 instead of being installed on the nozzle 2. Similarly, a bearing 6 is arranged in the mounting seat 5 to support the mixing tube 4 so that the mixing tube 4 can rotate in the mounting seat 5. In this installation method, in order to further achieve the function of cleaning the mixing tube 4, the mounting frame 1 and the mounting seat 5 are connected through a driving device 7. Figure 1The hydraulic cylinder drive is shown in the figure, and it can also be set to be driven by a motor screw. When the driving device 7 is used, the mounting seat 5 can move axially along the nozzle 2. Since the mixing tube 4 can only rotate in the mounting seat 5 but cannot move axially, the mixing tube 4 can also move axially when the mounting seat 5 is axially moved by the driving device 7, so that the nozzle 2 can extend into the mixing tube 4. When the mixing work is completed, there is still undischarged foaming material remaining on the inner wall of the mixing tube 4. If it is not cleaned in time, it will foam in the mixing tube 4, thereby clogging the mixing tube and affecting the next mixing work. Therefore, after the nozzle 2 completes the spraying, the driving device 7 drives the mixing tube 4 to move so that the nozzle 2 is inserted into the mixing tube 4, and the piston-type pushing of the end of the nozzle 2 pushes the residual material on the inner wall of the mixing tube 4 out of the mixing tube 4, so as to achieve the function of cleaning the mixing tube 4. In order to further improve the cleaning function, a sealing ring 2-6 is provided on the outer periphery of one end of the nozzle 2 close to the mixing tube 4. When scraping off the residual material on the inner wall of the mixing tube 4, the sealing ring 2-6 can be in close contact with the inner wall of the mixing tube 4, and the inner wall of the mixing tube 4 can be better cleaned through the sealing ring 2-6.

[0021] In the above structure, it is pointed out that the mixing tube 4 can be rotated. The embodiment shown in the figure is to realize the rotation of the mixing tube 4 by high-pressure airflow, that is, blades 8 are arranged on the outer wall of the mixing tube 4, and the high-pressure airflow drives the blades 8 to realize the rotation of the mixing tube 4. Of course, the figure only shows one embodiment, and here, the mixing tube 4 can also be driven to rotate by a motor through a chain, a belt or a gear.

[0022] Figure 1 A structure of the injection joint 3 is also provided, which is funnel-shaped, such as Figure 4 As shown, a partition plate 9 is arranged in the injection joint 3 to divide the inside of the injection joint 3 into two chambers. Two materials A and B are respectively injected into the two chambers through two solenoid valves 10 arranged on the injection joint 3. In this structure, a pair of feed ports are arranged in the nozzle 2. The pair of feed ports are respectively opposite to the two separated chambers, and the two feed ports are respectively connected to the first annular channel 2-4 and the second annular channel 2-5, so that the A material and the B material can be passed from their respective chambers into the first annular channel 2-4 and the second annular channel 2-5. In order to enable the A material and the B material to flow in quickly and smoothly, as shown in FIG. Figure 4 As shown, the feed port on the nozzle 2 is set in a funnel-like form, and each feed port is in an independent chamber, so as to prevent two materials from entering the same annular channel. Of course, the injection joint 3 is not limited to the above structure, and it can also be realized by connecting corresponding feed pipes to the first annular channel 2-4 and the second annular channel 2-5 respectively to inject different materials into different annular channels. Such changes in the structural form of the injection joint 3 belong to the protection scope.

[0023] Since some mixing may require the addition of a third material C (such as introducing glass fiber into the foaming material as C), the core rod 2-3 can be set to a tube shape, and the third material can be added and mixed by introducing C into the core rod 2-3. After the C material is injected into the mixing tube 4 through the core rod 2-3, the three materials are fully mixed through the swirling effect of the A material and the B material. Figure 1 The core rod 2-3 shown in the figure is a tubular feed with one end extending out of the injection joint 3. When material C needs to be added, it can be connected to the feed pipe for adding. When material C is not needed, it can be omitted, and it will not affect the mixing of material A and material B.

[0024] In order to prevent the material from splashing out of the upper end of the mixing tube 4 when the nozzle 2 sprays material A and material B, the mixing tube 4 can be sleeved on the front end of the nozzle 2 to prevent the material from splashing out of the mixing tube 4. However, there is a gap between the mixing tube 4 and the nozzle 2. In order to prevent the material from remaining in the gap, high-pressure gas can be introduced from the opening at the upper end of the mixing tube 4 to blow the material from the upper part of the mixing tube 4 downward to achieve cleaning and at the same time achieve the function of feeding. Under this structure, the structure of driving the mixing tube 4 to rotate by pneumatics can be directly realized, while the structure of driving the mixing tube 4 to rotate by a motor requires the installation of an independent air intake pipe above the mixing tube 4 to achieve air blowing. And for better air intake, such as Figure 2 As shown, during operation, the end of the nozzle 2 and the overlapping portion of the mixing tube 4 are gap-matched, and a chamfer 11 is provided at the portion where the mixing tube 4 and the end of the nozzle 2 are aligned to leave enough air intake space to facilitate the airflow to enter the mixing tube 4, so as to achieve a better blowing effect. This structure is a better structural choice.

Claims

1. A swirl stirring type mixing head, comprising a mounting frame (1), a nozzle (2) being fixed on the mounting frame (1), characterized in that: The nozzle (2) comprises, from outside to inside, a coaxially arranged outer tube (2-1), an intermediate tube (2-2) and a core rod (2-3); the outer tube (2-1) and the intermediate tube (2-2) are clearance-matched to form a first annular channel (2-4); the intermediate tube (2-2) and the core rod (2-3) are clearance-matched to form a second annular channel (2-5); an injection joint (3) is provided on the nozzle (2) for injecting material A and material B to be mixed into the first annular channel (2-4) and the second annular channel (2-5) respectively; a mixing tube (4) capable of rotating about a central axis is coaxially provided at one end of the nozzle (2) away from the injection joint (3); the outlets of the first annular channel (2-4) and the second annular channel (2-5) are provided with an inclination angle toward the inner wall of the mixing tube (4) so ​​that the outlets of the first annular channel (2-4) and the second annular channel (2-5) can be separated. A material and B material are sprayed in an umbrella-shaped manner onto the inner wall of a mixing tube (4); a mounting seat (5) is fixed on the nozzle (2), and a bearing (6) for supporting the mixing tube (4) is arranged inside the mounting seat (5); the injection joint (3) is funnel-shaped and is provided with a partition (9) for dividing the injection joint (3) into two chambers, and electromagnetic valves (10) are respectively provided on the injection joint (3) for injecting the A material and B material into the two chambers respectively. ), a pair of feed ports are connected between the nozzle (2) and the injection joint (3) to respectively connect the first annular channel (2-4) and the second annular channel (2-5) with the two chambers into which the A material and the B material are injected; a chamfer (11) is provided at the position where the mixing tube (4) is aligned with the nozzle (2) outlet for supplying air into the mixing tube (4); the core rod (2-3) is tubular and the C material can be fed into the mixing tube (4) through the core rod (2-3).

2. A swirl stirring mixing head according to claim 1, characterized in that: A mounting seat (5) is connected to the mounting frame (1), a bearing (6) for supporting the mixing tube (4) is arranged inside the mounting seat (5), and the mounting seat (5) is sleeved on the nozzle (2).

3. A swirl stirring mixing head according to claim 2, characterized in that: A driving device (7) is provided on the mounting frame (1) for driving the mounting seat (5) to move axially along the nozzle (2). When the mounting seat (5) moves, the nozzle (2) can extend into the mixing tube (4) to scrape off the material remaining on the inner wall of the mixing tube (4) and push it out of the mixing tube (4). A sealing ring (2-6) is provided on the outer periphery of one end of the nozzle (2) close to the mixing tube (4).

4. A swirl stirring mixing head according to claim 3, characterized in that: The driving device (7) is a cylinder, a hydraulic cylinder or a lead screw.

5. A swirl stirring mixing head according to any one of claims 1 to 3, characterized in that: The mixing tube (4) is driven to rotate by a motor.

6. A swirl stirring mixing head according to any one of claims 1 to 3, characterized in that: The mixing tube (4) is provided with blades (8), and the mixing tube (4) drives the blades (8) to rotate through high-pressure airflow.