Building Block Brick Making Machine

Uneven mixing of brick making equipment is usually related to the mixing structure design, parameter setting or material characteristics. The following is a systematic solution for design defects, combining structural optimization, parameter adjustment and supporting improvements to help improve mixing uniformity:
I. Mixing structure design optimization
1. Improvement of mixing blade/paddle design
Blade shape optimization
Combined blades (such as propeller blades + folding blade paddles) are used to take into account axial conveying and radial mixing functions. For example:
Axial blades (such as propellers) push the material along the mixing axis to solve the "dead angle" problem;
Radial blades (such as folding blade paddles) enhance material shearing and flipping, breaking up lumps.
For sticky materials, serrated blades with inclinations can be designed to improve cutting and dispersion effects.
Blade angle and spacing adjustment
The blade installation angle is recommended to be controlled at 30°~60° (angle with the mixing axis). Too small an angle affects flipping, and too large an angle increases energy consumption;
Blade spacing needs to be adjusted according to the particle size of the material, generally 1.5~3 times the maximum particle size, to avoid the retention of fine particles.
2. Improvement of the mixing shaft and barrel structure
Mixing shaft layout
Adopt multi-shaft coordinated mixing (such as a double-shaft horizontal mixer) to generate cross shear force through the reverse rotation of the two shafts, which is suitable for high-viscosity materials;
Single-shaft mixers can add eccentric mixing shaft design to reduce the "retention layer" in the central area.
Barrel shape and lining
The bottom of the barrel is changed to an arc or cone shape to eliminate right-angle dead corners;
Anti-stick coating (such as polytetrafluoroethylene) or guide baffles are added to the inner wall to guide the flow of materials and avoid "sticking to the wall".
3. Feed and discharge port design
Feed port position
Avoid direct impact of the feed on the blades. An oblique feed port or a dispersed feed device can be set to evenly distribute the material to the mixing area;
Multi-component materials are recommended to use zoned feeding to avoid local accumulation.
Discharge port optimization
The discharge port size must match the mixing efficiency. Too small will easily cause material retention, and too large will affect the sealing during mixing;
A rotary discharge valve can be designed to reduce material segregation during discharge.
2. Adjustment of mixing parameters and control system
1. Optimization of speed and mixing time
Speed ​​matching material characteristics
Low viscosity materials (such as sand and stone): the speed can be set to 20~50 rpm, and high-speed shearing can be used to improve mixing uniformity;
High viscosity materials (such as clay and concrete): the speed is controlled at 10~30 rpm to avoid heating or segregation of materials due to excessive shearing.
Extending critical mixing time
Determine the minimum uniform mixing time through experiments (such as using the "tracer method" to detect the mixing degree of materials) to avoid local unevenness due to insufficient mixing time.
2. Introducing intelligent control system
Online monitoring and feedback
Install torque sensors and material humidity sensors to monitor the mixing resistance and moisture content in real time, and automatically adjust the speed or feed;
Capture the mixing process through a visual inspection system (such as an industrial camera), analyze the uniformity of material distribution through an AI algorithm, and dynamically adjust the blade movement.
Variable frequency speed regulation technology
Use a frequency converter to achieve segmented control of the mixing speed (such as high-speed dispersion first, then low-speed uniform mixing), reducing energy consumption while improving mixing accuracy.
3. Auxiliary devices and supporting improvements
1. Add crushing and dispersing components
Install crushing rollers or dispersing paddles in the mixing drum to pre-crush large pieces of material (such as clay lumps) to reduce uneven mixing caused by particle size differences;
For scenarios where liquids (such as water and admixtures) need to be added, atomizing nozzles can be installed to ensure that the liquid is evenly sprayed into the material.
2. Material pretreatment and ratio optimization
Raw material screening
Strictly screen aggregates such as sand and stone to control the particle size deviation within ±5% to avoid large particle deposition;
Clay and other sticky materials need to be aged first to reduce moisture content fluctuations.
Ratio measurement accuracy
Upgrade the weighing system (such as using high-precision sensors) to ensure that the feeding error of each component is controlled within ±1%, especially trace components such as admixtures.
3. Regular maintenance and wear control
Check the wear of vulnerable parts such as blades and sleeves, and replace them in time when the wear exceeds 20% to avoid the mixing efficiency being reduced due to excessive gaps;
Clean the residual materials on the inner wall of the mixing drum to prevent "scaling" from affecting the mixing uniformity of subsequent batches.
IV. Verification and continuous improvement
Uniformity detection method
Chemical analysis method: sample and detect the component content of materials in each part (such as cement content deviation <3%);
Physical analysis method: measure the bulk density difference of materials (density deviation <2% when uniformly mixed).
Small batch trial production verification
Compare the quality of bricks before and after improvement through trial production (such as the standard deviation of compressive strength is reduced by >15%) to confirm the optimization effect;
Collect production data and establish a mixing parameter database to provide a basis for subsequent equipment upgrades.
Summary
Solving the problem of uneven mixing of brick machines requires coordinated improvements in three aspects: structural design (blades, shafts, drums), parameter control (speed, time, ratio) and auxiliary processes (pretreatment, testing). For complex working conditions, it is recommended to conduct simulations (such as CFD fluid analysis) in combination with material characteristics, predict mixing dead corners in advance and optimize the structure, ultimately achieving a balance between uniformity and production efficiency.