Analysis of the working principle of horizontal mixer
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Intense mixing movement shortens the mixing time, faster and more efficient. Even if the material has a difference in specific gravity and particle size, a good mixing effect can be achieved under the rapid and vigorous tumbling of the staggered stirring blades. High mixing uniformity and low residual amount, suitable for mixing two kinds of fertilizers and additive premixes.
Characteristics
The horizontal mixer makes the material fully mixed, thus improving the mixing uniformity; using the novel rotor structure, the minimum gap between the rotor and the bright body can be adjusted to near zero, effectively reducing the amount of material residue; The material is broken, the overall structure is more reasonable, the appearance is beautiful, and the operation and maintenance side is installed and maintained:
Maintenance of the machine is an extremely important and regular task. It should be closely coordinated with extreme operations and maintenance. There should be full-time personnel on duty.
Machine maintenance:
1. The shaft bears the full load of the negative machine, so good lubrication has a great relationship with the bearing life. It directly affects the service life and operation rate of the machine. Therefore, the required oil must be cleaned and the seal must be good. Main oil filling:
(1) Rotating bearing
(2) Roller bearing
(3) all gears
(4) movable bearing, sliding plane.
2. The newly installed tires are prone to loosening and must be inspected frequently.
3. Pay attention to whether the work of all parts of the machine is normal.
4, pay attention to check the wear level of wearable parts, always pay attention to replace the worn parts.
5. Place the bottom plane of the movable device, and the dust should be removed to prevent the movable bearing from moving on the chassis when the machine encounters unbreakable materials, resulting in serious accidents.
6, the bearing oil temperature rises, should stop immediately to check the reasons to eliminate.
7. If there is impact sound when the rotating gear is running, stop it immediately and check it out.
Installation test:
1. The equipment should be installed on a level concrete foundation and fixed with anchor bolts.
2. When installing, pay attention to the vertical direction of the main body and the horizontal.
3. After installation, check whether the bolts in all parts are loose and the main door is tight. If necessary, tighten them.
4. Configure the power cord and control switch according to the power of the device.
5. After the inspection is completed, the empty load test is carried out, and the test can be carried out normally.
Performance comparison of single-axis and double-shaft horizontal mixers
Stirring effect
1 double horizontal shaft mixer
The agitating process of the twin-shaft mixer not only occurs in the radial direction but also in the axial direction. The main mixing zone is located in the circumferential direction of the agitating body, and the energy value in this direction is maximized during the entire agitation process, so that the agitation space can be fully utilized, so that the aggregate speed of the aggregate, cement and water in the agitating blade is low (1.4 to 1.6). In the case of m/s), the most uniform optimum agitation mode is achieved in the shortest time to achieve the best mixing effect.
2 single horizontal shaft mixer
The mixing principle of the single-shaft mixer and the self-dropping mixer is basically similar. The rotation of the stirring shaft (blade) is to raise the concrete to a certain height, and then let it fall freely to complete a stirring process. Therefore, when the single-shaft mixer is used, the effective working volume is smaller than the theoretical design volume, and the overall height is much larger than that of the twin-shaft mixer. When producing RCC, the actual production efficiency of the single-shaft mixer is lower than the rated production efficiency. .
Wear resistance
1 double horizontal shaft mixer
The mixing principle and process of the twin-shaft mixer ensure that most of the mixed concrete is deposited between the two agitating shafts, so that the wear between the agitating arms and the blades and the bottom lining is reduced. Practice has proved that only 25% of the blades in the non-main mixing zone have wear phenomenon, only slight wear or even wear in the main mixing zone, and the double-shaft mixer liner can be selected from ordinary steel plates or wear-resistant cast iron according to operating conditions.
2 single horizontal shaft mixer
Due to the high peripheral speed of the agitating blades and the rotational trajectory of the blades, the wear of the single-shaft mixer is greater than that of the twin-shaft mixer. Therefore, the maintenance cost is increased by using expensive special steel.
Discharge performance
1 double horizontal shaft mixer
Since the concrete is basically piled up near the discharge door when the twin-shaft mixer is completed, the discharge takes a short time. The discharge door controlled by the electrical device can be adjusted in opening degree, and the discharge door will not be caught when it is closed. During the unloading process, the blades rotate at a low speed, which is beneficial to remove the concrete remaining in the mixing drum, which can effectively avoid the parabolic phenomenon when the disc machine is unloaded.
2 single horizontal shaft mixer
Due to the limitation of the system structure, the opening size of the discharge door is difficult to adjust, which has a great influence on the discharge of different proportioning concrete. In addition, the discharge door is easily caught during the closing process, especially in the emergency shutdown state. It is more prone to problems, and the sealing of the discharge door is poor.
Load start feature
1 double horizontal shaft mixer
Due to the short mixing arm of the twin-shaft mixer and the lubrication system, the hydrostatic starter is installed so that the main motor can be started under full load. In operation, the mixer is usually required to start under unconventional conditions.
2 single horizontal shaft mixer
The single-shaft mixer can also be started under load.
Mixing drive system
1 double horizontal shaft mixer
The twin-shaft mixer adopts V-belt and slip gear structure, which has low noise and good overload protection function, and is suitable for maintenance.
2 single horizontal shaft mixer
The single-shaft mixer uses a chain drive structure that adds wear and creates additional vibration. Maintenance costs are high.
development trend
At present, the large-scale forced mixer (>3m3) for the production of RCC is blank. The continuous forced mixer is in the starting state in China, and the technology is still not mature. The introduction of foreign advanced technology will improve the forced mixing building and large-scale mandatory of hydropower projects in China. The design and manufacturing level of the mixer and continuous forced mixer meet the requirements of high-speed, continuous and high-strength construction of large-scale RCC dam hydropower projects, which will be the main development trend of horizontal mixers.