Mixer and production system for gypsum mixture

Abstract

The production system comprises a crusher, a conveyor, a mixer and a weighing machine which are arranged in sequence, the mixer comprises a barrel and a feed port, a stirring mechanism is arranged in the mixer, a driving system for driving the stirring mechanism to operate is arranged at the end of the mixer, an airflow auxiliary dispersion device is further arranged on the barrel, and the airflow auxiliary dispersion device is arranged on the feed port. The airflow auxiliary dispersing device comprises a pulse nozzle set, an airflow distributor, a high-pressure air source system and a control unit, the pulse nozzle set comprises a plurality of pulse nozzles arranged at intervals in the length direction of the barrel, the pulse nozzles are obliquely arranged on the side wall of the barrel, and the nozzles are connected with the high-pressure air source system through the airflow distributor; the high-pressure air source system comprises an oilless air compressor and an air storage tank, and the control unit is used for controlling the blowing frequency and duration of the pulse nozzle set. The device obviously improves the mixing uniformity, reduces the energy consumption, is simple and reliable in structure, and is suitable for the transformation of the existing mixing machine.

Description

Technical Field

[0001] This utility model relates to the technical field of building material production equipment, specifically to a mixing machine and a production system for gypsum mixtures. Background Technology

[0002] In the production of gypsum mixtures, traditional mixing equipment faces three main technical bottlenecks: First, lightweight additives (such as glass fiber) are prone to floating due to density differences, resulting in uneven distribution and a mixing variation coefficient that often exceeds 8%; second, after gypsum powder absorbs moisture and clumps together, conventional mechanical stirring is difficult to effectively disperse it, leaving a large number of clumps larger than 500μm in the finished product; and third, in order to meet the mixing requirements, the stirring time needs to be extended to 12-15 minutes, with energy consumption as high as 5.8-6.5kWh / t.

[0003] However, existing improvement solutions all have obvious drawbacks: increasing the number of stirring blades can improve the dispersion effect, but it will cause the material to heat up by 8-12°C and create a mixing dead zone; vibration-assisted technology can help break up lumps, but it will generate noise of more than 95dB and increase the failure rate by 40%.

[0004] None of these methods can fundamentally solve the problem of lightweight material floating, and there is an urgent need to develop new hybrid technologies that take into account the mixing quality, energy consumption, and equipment reliability. Utility Model Content

[0005] In view of the problems and deficiencies in the existing technology, this utility model provides a mixing machine and a production system for gypsum mixtures.

[0006] The technical solution of this utility model is as follows:

[0007] A mixing machine includes a cylinder with a feed inlet, an internal stirring mechanism, a drive system at one end to drive the stirring mechanism, and an airflow-assisted dispersion device on the cylinder for injecting pulsed airflow into the cylinder.

[0008] The airflow-assisted dispersion device includes a pulse nozzle group, an airflow distributor, a high-pressure air source system, and a control unit. The pulse nozzle group includes several pulse nozzles spaced apart along the length of the cylinder. The pulse nozzles are inclinedly arranged on the side wall of the cylinder. The nozzles are connected to the high-pressure air source system through the airflow distributor. The high-pressure air source system includes an oil-free air compressor and an air tank. The control unit is used to control the blowing frequency and duration of the pulse nozzle group.

[0009] Furthermore, the nozzle is installed at an angle of 15°-25°, forming an acute angle with the radial direction of the cylinder.

[0010] Furthermore, the pulse nozzle assembly includes multiple tungsten carbide wear-resistant nozzles arranged along the length of the cylinder with a spacing of 1 / 4 to 1 / 3 of the cylinder length and a nozzle orifice diameter of 2-3 mm.

[0011] Preferably, the inner cavity of the pulse nozzle assembly is coated with a polytetrafluoroethylene anti-stick coating with a thickness of 0.1 mm.

[0012] Preferably, the inner wall of the cylinder is provided with spiral guide ridges, the height of which is 1 / 50 to 1 / 30 of the cylinder diameter. The guide ridges work in conjunction with the airflow to avoid dead zones where materials accumulate.

[0013] Each branch of the airflow distributor is equipped with a flow regulating valve, and pressure sensors and filter drying units are installed on the pipelines.

[0014] The high-pressure gas source system outputs a pressure of 0.6-0.8 MPa and a flow rate of 3-5 m³ / h. 3 / min, the volume of the gas storage tank is not less than 500L.

[0015] The mixer also includes an auxiliary system with a dust removal interface and a heating jacket. A bag filter is connected to the top of the cylinder, and the heating jacket is spaced on the outer wall of the cylinder to form a sandwich with the cylinder. Heat transfer oil is circulated in the sandwich.

[0016] The mixing mechanism of the mixer includes two parallel mixing shafts, and the mixing shafts are equipped with mixing paddles.

[0017] A production system for gypsum mixtures includes the aforementioned mixer, a crusher and a conveyor arranged sequentially upstream of the mixer, and a weighing machine arranged downstream of the mixer.

[0018] The beneficial effects of this utility model are:

[0019] Significantly improved mixing uniformity: Through the synergistic effect of high-pressure pulsed airflow and mechanical stirring, the problem of floating of lightweight additives is effectively solved, which improves the distribution uniformity of lightweight materials such as glass fiber by more than 40%, and reduces the mixing variation coefficient from 8% to less than 3%, ensuring the consistency of the mechanical properties of the products.

[0020] Excellent agglomeration breaking effect: High-pressure airflow of 0.6-0.8MPa can completely break up gypsum powder agglomerates. Tests have shown that the content of agglomerates larger than 500μm in the finished product is reduced by more than 90%, which significantly improves the workability and surface quality.

[0021] Energy efficiency is significantly optimized: airflow assistance reduces mixing time by 50% to 6-8 minutes, and unit energy consumption is reduced to 4.3kWh / t, achieving an energy saving effect of 26%, while avoiding the material temperature rise problem caused by traditional multi-blade design.

[0022] The operating environment is significantly improved: compared to vibration-assisted technology, the noise level of this device is controlled below 75dB, and the enclosed design results in a dust concentration of less than 5mg / m³. 3 This has greatly improved the working environment.

[0023] Enhanced equipment reliability: The tungsten steel nozzle, combined with the PTFE anti-stick coating, has a service life of over 800 hours, significantly reducing maintenance costs.

[0024] Highly adaptable: By adjusting the airflow parameters, it can be adapted to the production of gypsum mixtures with different formulations, and is especially suitable for the preparation of high-end gypsum products containing lightweight reinforcing materials. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a gypsum mixture production system according to an embodiment;

[0026] Figure 2 for Figure 1 The right view;

[0027] Figure 3 This is a sectional view of the mixer;

[0028] The components represented by the reference numerals in the diagram are:

[0029] 1. Mixer; 2. Screw conveyor; 3. Weighing machine; 11. Mixing mechanism; 12. Pulse nozzle. Detailed Implementation

[0030] The technical means adopted to achieve the intended purpose of this utility model will be further described below with reference to the accompanying drawings of the embodiments of this utility model.

[0031] Example

[0032] A mixing machine includes a cylinder with a feed inlet, an internal stirring mechanism 11, a drive system at one end for driving the stirring mechanism 11, and an airflow-assisted dispersion device on the cylinder for injecting pulsed airflow into the cylinder.

[0033] The airflow-assisted dispersion device includes 12 sets of pulse nozzles, an airflow distributor, a high-pressure air source system, and a control unit. The 12 sets of pulse nozzles include a number of pulse nozzles 12 spaced apart along the length of the cylinder. The pulse nozzles 12 are inclinedly arranged on the side wall of the cylinder. The nozzles are connected to the high-pressure air source system through the airflow distributor. The high-pressure air source system includes an oil-free air compressor and an air tank. The control unit is used to control the blowing frequency and duration of the 12 sets of pulse nozzles.

[0034] When this mixer 1 is working, the gypsum raw material is crushed by the upstream crusher and then conveyed to the feed inlet of the mixer 1 by the conveyor. The drive system drives the stirring mechanism 11 to operate, and at the same time, the control unit activates the airflow-assisted dispersion device, which intermittently sprays high-pressure airflow into the cylinder through the pulse nozzles 12. The airflow and mechanical stirring work together to achieve three-dimensional mixing of the materials. This design improves the mixing efficiency by more than 40% while reducing energy consumption by 26%, solving the problems of low efficiency and high energy consumption of traditional mixers.

[0035] Furthermore, the nozzle is installed at an angle of 15°-25°, forming an acute angle with the radial direction of the cylinder.

[0036] Furthermore, the 12 pulse nozzle groups include multiple tungsten carbide wear-resistant nozzles arranged along the length of the cylinder, with a spacing of 1 / 4 to 1 / 3 of the cylinder length, and a nozzle orifice diameter of 2-3 mm.

[0037] Preferably, the inner cavity of the 12 pulse nozzles is coated with a polytetrafluoroethylene (PTFE) anti-stick coating with a thickness of 0.1 mm. The tungsten carbide wear-resistant nozzles of the airflow-assisted dispersion device are coated with a 0.1 mm PTFE anti-stick coating, which, together with the clean air source provided by the filter and drying unit, ensures long-term stable operation of the system. The anti-stick design extends the nozzle life by 3 times.

[0038] Preferably, the inner wall of the cylinder is provided with spiral guide ridges, the height of which is 1 / 50 to 1 / 30 of the cylinder diameter. The guide ridges work in conjunction with the airflow to avoid dead zones where materials accumulate.

[0039] Each branch of the airflow distributor is equipped with a flow regulating valve, and pressure sensors and filter drying units are installed on the pipelines.

[0040] The high-pressure gas source system outputs a pressure of 0.6-0.8 MPa and a flow rate of 3-5 m³ / h. 3 The air volume of the gas storage tank is not less than 500L. A high-pressure air source system provides dry compressed air at 0.6-0.8MPa, which is evenly distributed to each pulse nozzle 12 via an airflow distributor. The nozzles pulse and spray at intervals of 2-5 seconds, each pulse lasting 0.1-0.3 seconds. The spraying frequency is controlled in conjunction with the stirring speed. The inclined nozzles ensure that the airflow and material movement direction form the optimal impact angle. The pulse spraying method can save 30% of air source consumption, and the inclined angle design increases airflow utilization by 45%.

[0041] This utility model of a mixer also includes an auxiliary system with a dust removal interface and a heating jacket. A bag filter is connected to the top of the cylinder, and the heating jacket is spaced apart on the outer wall of the cylinder, forming a sandwich with the cylinder. Heat transfer oil flows through the sandwich. The bag filter connected to the dust removal interface can maintain a clean working environment. The heating jacket can maintain a mixing temperature of 50-120℃, preventing premature hydration of gypsum and preventing material agglomeration.

[0042] The mixing mechanism 11 of the mixer 1 includes two parallel mixing shafts, each equipped with a mixing blade. The mixing mechanism 11 employs a dual-shaft design, with the staggered mixing blades on the two shafts creating a complex material flow trajectory. Combined with the spiral guide ridges on the inner wall of the cylinder, this forms an efficient material circulation path. The dual-shaft mixing combined with the guide ridges significantly improves the mixing uniformity.

[0043] A production system for gypsum mixtures includes the aforementioned mixer 1, a crusher and a conveyor arranged sequentially upstream of the mixer 1, and a weighing machine 3 arranged downstream of the mixer 1.

[0044] The working process of mixer 1 during system operation:

[0045] Start-up phase: Turn on the heating system to preheat the cylinder and start the dust removal device;

[0046] Feeding stage: The crushed gypsum raw materials and additives are fed into mixer 1 by a conveyor;

[0047] Mixing stage: Simultaneously start the stirring mechanism 11 and the airflow auxiliary device, and operate according to the set parameters;

[0048] Unloading stage: After mixing is completed, open the bottom pneumatic valve to discharge the material to the inlet of screw conveyor 2, and then convey it to weighing machine 3 via screw conveyor 2.

[0049] This system is particularly suitable for the production of gypsum mixtures containing lightweight additives such as glass fiber. The airflow assistance effectively solves the problem of lightweight materials floating. Practical applications show that the strength deviation of gypsum products produced using this system is controlled within ±5%.

[0050] The above description represents a preferred embodiment of the present invention. However, the present invention is not limited to the above-described embodiments and examples. Within the scope of knowledge possessed by those skilled in the art, all variations, equivalent substitutions, and improvements made without departing from the concept of the present invention should be included within the protection scope of the present invention.

Claims

1. A mixing machine, comprising a cylinder with a feed inlet thereon, a stirring mechanism (11) inside, and a drive system for driving the stirring mechanism (11) to run at one end; Its features are, The cylinder is also equipped with an airflow-assisted dispersion device for injecting pulsed airflow into the cylinder. The airflow-assisted dispersion device includes a pulse nozzle (12) group, an airflow distributor, a high-pressure air source system, and a control unit; The pulse nozzle (12) group includes a number of pulse nozzles (12) spaced apart along the length of the cylinder. The pulse nozzles (12) are inclinedly arranged on the side wall of the cylinder. The nozzles are connected to the high-pressure gas source system through the airflow distributor. The high-pressure air supply system includes an oil-free air compressor and an air tank; The control unit is used to control the blowing frequency and duration of the pulse nozzle (12) group.

2. The mixer according to claim 1, characterized in that, The nozzle is installed at an angle of 15°-25°, forming an acute angle with the radial direction of the cylinder.

3. The mixer according to claim 2, characterized in that, The pulse nozzle (12) group includes multiple tungsten steel wear-resistant nozzles arranged along the length of the cylinder, with a spacing of 1 / 4 to 1 / 3 of the cylinder length, and the nozzle orifice diameter is 2-3 mm.

4. The mixer according to any one of claims 1-3, characterized in that, The inner cavity of the pulse nozzle (12) assembly is coated with a polytetrafluoroethylene anti-stick coating with a thickness of 0.1 mm.

5. The mixer according to claim 1, characterized in that, The inner wall of the cylinder is provided with a spiral guide ridge, the height of which is 1 / 50 to 1 / 30 of the cylinder diameter.

6. The mixer according to claim 1, characterized in that, Each branch pipe of the airflow distributor is equipped with a flow regulating valve, and pressure sensors and filter drying units are installed on the pipes.

7. The mixer according to claim 1, characterized in that, The output pressure of the high-pressure gas source system is 0.6-0.8 MPa, and the flow rate is 3-5 m³ / s. 3 / min, the volume of the gas storage tank is not less than 500L.

8. The mixer according to claim 1, characterized in that, It also includes an auxiliary system with a dust removal interface and a heating jacket. A bag filter is connected to the top of the cylinder, and the heating jacket is spaced on the outer wall of the cylinder to form a sandwich with the cylinder. Heat transfer oil is circulated in the sandwich.

9. The mixer according to claim 1, characterized in that, The mixing mechanism (11) of the mixer (1) includes two parallel mixing shafts, and the mixing shafts are equipped with mixing paddles.

10. A production system for gypsum mixtures, characterized in that, The mixture includes the mixer (1) as described in any one of claims 1-9, a crusher and a conveyor arranged sequentially upstream of the mixer (1), and a weighing machine (3) arranged downstream of the mixer (1).

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