Quantitative mixing and adding device for liquid A and liquid B

Abstract

The utility model discloses a quantitative mixing and adding device for liquid A and liquid B. The device comprises a mixing box body, symmetrically arranged pushing mechanisms and a driving assembly, a confluence pipeline and a stirring cavity are arranged in the mixing box body, and one-way valves are mounted at two side flow channel inlets; the pushing mechanism drives a pushing rod through a servo hydraulic cylinder, a polyether-ether-ketone lining layer is arranged on the inner wall of a pushing barrel, and a taper angle sealing sleeve is arranged between the pushing rod and the barrel wall; the stirring shaft penetrates through the box body and is provided with multiple layers of shearing blades. The mixing precision of + / -1% is achieved through pressurization of the conical sealing sleeve and servo hydraulic closed-loop control, the replaceable lining and the variable-diameter outlet are matched for 1: 1-1: 8 proportional adjustment, and the maintenance efficiency is improved by 80% by combining the quick-release sealing assembly. And the problems of non-uniform mixing, sealing leakage and time-consuming remodeling of traditional equipment are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of shoe sole TPU injection molding original liquid mixing, especially relates to a AB liquid quantitative mixing and adding device. BACKGROUND

[0002] In shoe sole TPU injection molding production process, the accurate mixing of AB two-component original liquid is the core link that influences the mechanical property and appearance quality of finished product.The traditional mixing equipment has the following technical defects: 1, low proportion control precision: when adopting gear pump or screw metering, high viscosity liquid is easy to produce pulsation, leading to mixing proportion deviation more than ± 5%, causing injection molding piece hardness uneven, bubble defect and other problems;2, mixing uniformity is insufficient: static mixer is poor in stratified mixing effect to AB liquid with big viscosity difference, and dynamic stirring mechanism is easy to cause cross contamination due to sealing failure;3, equipment maintenance is complex: sealing parts that frequently contact chemical solvent are easy to swell and wear, and the disassembly and replacement of pushing mechanism takes 2-3 hours, influencing production line continuity.

[0003] Although the prior art attempts to adjust the flow through the proportional valve, the pressure fluctuation in the high-viscosity medium conveying and the long-term sealing problem have not been solved, and it is difficult to meet the strict requirements of the shoe material industry for fine production. UTILITY MODEL CONTENT

[0004] The utility model solves the technical problem of overcoming the defects of the prior art and provides an AB liquid quantitative mixing and adding device.

[0005] In order to solve the above technical problems, the utility model provides the following technical scheme:

[0006] The utility model relates to an AB liquid quantitative mixing and adding device, which comprises:

[0007] A mixing box body is provided with a confluence pipeline and a stirring cavity body connected from top to bottom, and the confluence pipeline is symmetrically provided with a flow connecting channel on both sides;

[0008] Two groups of pushing mechanisms and a one-way valve, wherein the one-way valve is fixedly installed at the inlet end of the flow connecting channel, and the pushing mechanism is sealingly connected with the inlet end of the one-way valve through an adapter;

[0009] A driving motor is installed at the top of the mixing box body, and an output end is connected with a stirring shaft penetrating through the confluence pipeline and the stirring cavity body, and a first rotary sealing sleeve is arranged between the stirring shaft and the inner wall of the confluence pipeline;

[0010] The pushing mechanism comprises a servo hydraulic cylinder, a push rod and a pushing barrel, one end of the push rod is connected with a piston of the servo hydraulic cylinder, the other end of the push rod extends to the inside of the pushing barrel, the outlet end of the pushing barrel is communicated with a one-way valve through an adapter, a second sealing sleeve is arranged between the push rod and the inner wall of the pushing barrel, a feeding connector for connecting an external feeding pipe through a quick-release clamp is arranged on the side wall of the pushing barrel, and the side wall of the pushing barrel is provided with a feeding connector;

[0011] The bottom of the stirring cavity is provided with a discharging connector.

[0012] As a preferred technical scheme of the utility model, the first end of the second sealing sleeve close to the outlet of the pushing barrel is a conical structure, the outer diameter thereof is tapered along the liquid flow direction, and the taper angle is 15°-45°.

[0013] As a preferred technical scheme of the utility model, the section of the stirring shaft located in the stirring cavity is provided with multiple layers of shearing blades, and the spacing between adjacent layers of blades is 1 / 8-1 / 6 of the height of the stirring cavity.

[0014] As a preferred technical scheme of the utility model, the servo hydraulic cylinder is connected with a controller, the controller is configured to dynamically adjust the advancing speed of the push rod according to the signal of the flow sensor at the feeding connector and the signal of the pressure sensor at the discharging connector, and the mixing ratio adjustment range of the AB liquid is 1:1-1:8.

[0015] As a preferred technical scheme of the utility model, the locking torque of the quick-release clamp is 5-15 N·m, the number of clamping jaws is 3-6, the number of clamping jaws is evenly distributed, the inner wall of the pushing barrel is provided with a polyether ether ketone wear-resistant lining layer, and the thickness of the lining layer is 1-3 mm.

[0016] As a preferred technical scheme of the utility model, the material of the first rotary sealing sleeve and the second sealing sleeve is fluororubber or polytetrafluoroethylene, and a self-lubricating coating is arranged on the contact surface of the stirring shaft / push rod.

[0017] Compared with the prior art, the utility model has the beneficial effects as follows:

[0018] 1. Revolutionary improvement of mixing accuracy: the servo hydraulic cylinder drives the push rod to realize nanoscale displacement control (repeat positioning accuracy ≤±0.1 mm), and the flow-pressure double closed-loop feedback algorithm is combined to compress the AB liquid mixing ratio error to within ±0.8%; the second sealing sleeve with an optimized taper angle has a leakage amount of less than 0.05 mL / min within a pressure range of 0.5-8 MPa, and cross contamination is completely eliminated;

[0019] 2. Comprehensive upgrade of mixing uniformity: the multiple layers of staggered shearing blades form a vortex-laminar composite flow field, so that the TPU prepolymer and the curing agent reach a mixing uniformity of more than 90% within 3-5 seconds; the polyether ether ketone wear-resistant lining layer reduces the flow resistance and avoids the wall-hanging residual of high-viscosity liquid;

[0020] 3. The mixing ratio is continuously adjustable over a wide range of 1:1 to 1:8 to meet the injection molding needs of different TPU systems. Attached Figure Description

[0021] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0024] Figure 3 This is a cross-sectional structural diagram of the mixing box in this utility model;

[0025] Figure 4 This is a cross-sectional structural diagram of the material pushing mechanism in this utility model;

[0026] In the diagram: 1. Mixing chamber; 2. One-way valve; 3. Pushing mechanism; 4. Adapter; 5. Feed connector; 6. Discharge connector; 11. Confluence pipe; 12. Flow channel; 13. Stirring chamber; 14. Drive motor; 15. Stirring shaft; 16. First rotary sealing sleeve; 17. Shearing blade; 31. Servo hydraulic cylinder; 32. Push rod; 33. Pushing cylinder; 34. Second sealing sleeve. Detailed Implementation

[0027] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0028] In the attached diagram, all identical reference numerals refer to the same components.

[0029] Example 1: As Figures 1-4 As shown, this utility model provides an AB liquid quantitative mixing and adding device, which includes the following structural components:

[0030] 1. Hybrid enclosure assembly:

[0031] The mixing chamber 1 is equipped with a merging pipe 11 and a stirring chamber 13 that are connected from top to bottom. The merging pipe 11 has symmetrical flow channels 12 on both sides, and the central axis of the flow channel 12 makes an angle of 45° with the vertical direction.

[0032] A conical discharge port with a cone angle of 60° is welded to the bottom of the mixing chamber 13, and a discharge connector 6 is connected to the end of the discharge port.

[0033] 2. The push mechanism assembly:

[0034] Two groups of push mechanism 3 are connected with one-way valve 2 through adapter 4, and one-way valve 2 is fixed at the inlet end of flow channel 12;

[0035] The inner wall of push cylinder 33 is compounded with polyether ether ketone lining layer, the thickness of the lining layer is 2 mm, and the second sealing sleeve 34 is assembled between the push rod 32 and the inner wall of the push cylinder 33;

[0036] The piston rod of servo hydraulic cylinder 31 is rigidly connected with push rod 32 through threads, and the coaxial error is less than or equal to 0.05 mm;

[0037] 3. The drive sealing assembly:

[0038] The output end of the drive motor 14 is coaxially connected with the stirring shaft 15, and the stirring shaft 15 penetrates the confluence pipeline 11 and the stirring cavity 13;

[0039] The first rotary sealing sleeve 16 is arranged between the stirring shaft 15 and the inner wall of the confluence pipeline 11, and the sealing sleeve is made of polytetrafluoroethylene filled with carbon fibers;

[0040] The feeding connector 5 of the push cylinder 33 is connected with the external feeding pipe through a quick-release clamp, the quick-release clamp is made of 316L stainless steel, the number of clamping jaws is four, which are uniformly distributed at an angle of 90°, and a 0.5 mm thick fluororubber sealing gasket is arranged on the inner wall of the clamp;

[0041] The working process of the utility model is as follows:

[0042] 1. After the TPU prepolymer is injected into the push cylinder 33 through the feeding connector 5, the servo hydraulic cylinder 31 pushes the push rod 32 at a speed of 0.5-5 mm / s;

[0043] 2. The liquid breaks through the opening pressure 0.3 MPa of the one-way valve 2 after being pressurized by the second sealing sleeve 34, and the two liquid streams meet in the confluence pipeline 11;

[0044] 3. The mixed liquid is output from the discharge connector 6 to the injection molding machine after being sheared by the three shear blades 17 on the stirring shaft 15.

[0045] Example 2: sealing structure optimization implementation

[0046] Based on the improvement of example 1: the second sealing sleeve 34 near the outlet end is adjusted to a taper angle of 28°, and the length of the tapered section is set to 35 mm; the inner wall lining surface of the push cylinder 33 is processed with a spiral flow guide groove with a depth of 0.3 mm and a groove spacing of 15 mm; the first rotary sealing sleeve 16 is additionally provided with a spring energy storage ring, the spring wire diameter is 1.2 mm, and the pre-compression amount is 18%;

[0047] Technical effect: under the working pressure of 8 MPa, the leakage amount of the sealing structure is less than or equal to 0.01 mL / min;

[0048] The push rod 32 reset stroke residual amount is reduced from 0.8 mL to 0.05 mL;

[0049] Example 3: wide proportion adaptation implementation

[0050] The structural improvement includes: the pusher barrel 33 is equipped with a replaceable liner, providing two specifications of inner diameters of 30 mm and 50 mm; the shear blade 17 of the stirring shaft 15 is designed as a quick-release module, supporting three torsion angle options of 15° / 30° / 45°; the discharge connector 6 is replaced with a variable-diameter structure, providing two specifications of outlet diameters of 8 mm and 12 mm;

[0051] Application scenario: when the inner diameter of 30 mm liner and the 8 mm outlet are selected, 1:1 high-precision mixing of AB liquid is realized (suitable for TPU injection of shoe sole reinforcing ribs); when the inner diameter of 50 mm liner and the 12 mm outlet are selected, 1:8 large-flow mixing of AB liquid is realized (suitable for foaming TPU insole midsole).

[0052] The utility model discloses an AB liquid quantitative mixing and adding device, through the modularization mechanical structure innovation, the systematic solution shoe material TPU injection mixing precision, equipment life and production flexibility three big industry pain points.

[0053] Finally, it should be noted that: the above only for the preferred embodiment of the utility model, and does not limit the utility model, although the utility model is described in detail with reference to the foregoing embodiments, for the person skilled in the art, it still can modify the technical scheme recorded in the foregoing each embodiment, or equivalent replacement to part of technical features. Any modification, equivalent replacement, improvement etc. that is made within the spirit and principles of the utility model, should be included in the protection scope of the utility model.

Claims

1. An AB liquid dosing mixing adding device, characterized by, The utility model relates to a mixing box (1) which is internally provided with a confluence pipeline (11) and a stirring cavity (13) in communication from top to bottom, the confluence pipeline (11) is symmetrically provided with a flow channel (12) on both sides, two groups of pushing mechanism (3) and a one-way valve (2), wherein the one-way valve (2) is fixedly installed at the inlet end of the flow channel (12), the pushing mechanism (3) is sealingly connected with the inlet end of the one-way valve (2) through an adapter (4), a driving motor (14) is installed at the top of the mixing box (1), and an output end is connected with a stirring shaft (15) penetrating through the confluence pipeline (11) and the stirring cavity (13), a first rotary sealing sleeve (16) is arranged between the stirring shaft (15) and the inner wall of the confluence pipeline (11), the pushing mechanism (3) comprises a servo hydraulic cylinder (31), a push rod (32) and a pushing barrel (33), one end of the push rod (32) is connected with the piston of the servo hydraulic cylinder (31), the other end extends into the inside of the pushing barrel (33), the outlet end of the pushing barrel (33) is communicated with the one-way valve (2) through the adapter (4), a second sealing sleeve (34) is arranged between the push rod (32) and the inner wall of the pushing barrel (33), the side wall of the pushing barrel (33) is provided with a feeding connector (5) connected with an external feeding pipe through a quick-release clamp, and a discharging connector (6) is arranged at the bottom of the stirring cavity (13). The end of the second sealing sleeve (34) close to the outlet of the pushing barrel (33) is a conical structure, the outer diameter thereof is tapered along the liquid flow direction, and the taper angle is 15 DEG to 45 DEG.

2. The AB liquid dosing mixing and adding device according to claim 1, characterized in that, The section of the stirring shaft (15) located in the stirring cavity (13) is provided with multiple layers of shearing blades (17), and the distance between adjacent layers of blades is 1 / 8 to 1 / 6 of the height of the stirring cavity (13).

3. The AB liquid dosing mixing and adding device according to claim 1, characterized in that, The servo hydraulic cylinder (31) is connected with a controller, the controller is configured to dynamically adjust the advancing speed of the push rod (32) according to the signal of the flow sensor at the feeding connector (5) and the signal of the pressure sensor at the discharging connector (6), and the mixing ratio of AB liquid is adjusted in the range of 1:1 to 1:

8.

4. The AB liquid dosing mixing and adding device according to claim 1, characterized in that, The locking torque of the quick-release clamp is 5-15 N*m, the number of clamping jaws is 3-6, the number is uniformly distributed, a polyether ether ketone wear-resistant lining layer is arranged on the inner wall of the pushing barrel (33), and the thickness of the lining layer is 1-3 mm.

5. The AB liquid dosing mixing and adding device according to claim 1, characterized in that, The materials of the first rotary sealing sleeve (16) and the second sealing sleeve (34) are fluororubber or polytetrafluoroethylene, and a self-lubricating coating is arranged on the contact surface of the stirring shaft (15) / pushing rod (32).

6. The AB liquid dosing mixing and adding device according to claim 1, characterized in that, ​

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