Twin shaft concrete mixer performance characteristics and operating procedures

Concrete twin-shaft  mixer is mainly used for mixing of various powder materials. We can produce all kinds of powder mixing materials. Its aggregate may be wet fly ash, calcium carbide sludge, gypsum, gravel, slag and so on. It is mainly used in the past of supporting host a variety of standard bricks, sand-lime brick production line, one of the important equipment is autoclaved fly ash bricks, sand-lime brick production process of. Now a major project in the concrete mixing station also put it as supporting the host.

Structure Features
Concrete twin-shaft compulsory mixer is mainly composed of chassis, screw shaft assembly, drives, piping, cover, chain cover and other components.

operation specification

1
Check before use
Transmission to press the switch, and then close the knife, to check whether the operation is flexible. Vibrators, roller operation, dial feed stick is functioning properly. Rope is wound on the reel; lift the refuse station, etc. are normal. If found fault, notify electromechanical team process. After the deal, before use.
2
Once the material can not be too much, according to the ratio of materials, pay attention to water-cement ratio. Stir once mixing time of not less than one minute, normal marinated concrete, it should be very thick porridge-like.
3
Fixed hand boot, drivers should be familiar with the role of the principle of each operating system, found fault immediately stop inspection.

4
Most appliances should love, cables to protect against damage.
5
Mixers should level up, people can not stand under the hopper mixer, to prevent the next funnel trounced wounding.
6
Temporary stop rail, it should regularly (every twenty minutes), start the mixer, to prevent solidification of concrete or concrete poured into the drum, drum rinse.
7
After filling Tongjiao End stop, should be promptly mortar and machine outer drum water rinse clean. Next class clean up once the feed hopper to feed a predetermined position when material falls political decentralization, and coated with a layer of oil on the outside until the next use.

What is about the tower crane safety device

About the tower crane safety device:

(1) Hook safety device: to prevent the sling on the hook by the automatic safety device on the hook slip. That opening install a hook head pressing spring, closing the opening, this spring sheet can only push down on, put not dug up after people sling to prevent sling off automatically.
(2) reel safety device: Effective measures beyond the rope due to improper outside winding reel accident prevention. Its practice varies, mostly shrouded in welding a steel drum, the restrictions can only move within the rope reel range.
(3) Fixed base: digging the groove depth 600mm, the dust poured concrete, the surface smooth, waterproof and ground protection measures.

Understanding of the tower crane electrical equipment and security devices

 

     Production at the site, we can often see the shadow of the tower crane. Use tower crane production has penetrated the building, then as a spectator, tower crane know? Here's a detailed electrical equipment and safety devices under the tower machine, what does? It can be divided into: limit switches (stopper); overload fuse; buffer stopper device; rope anti-off devices; anemometer; emergency safety switch; security audio signal. First is the tower crane electrical equipment including cable reel - central collector ring motor, the operation of the motor with electrical appliances. Like a controller, master controller, contactors and relays. Protection appliances are important electrical tower equipment. Tower crane safety device is essential on production safety is the most important. It can be divided into: limit switches; overload fuse; buffer stopper device; rope anti-off devices; anemometer; emergency safety switch; security audio signal. For now, the tower crane safety devices have been more perfect.

Tower crane inspection requirements

   1.the safe operation of tower cranes from the tail and around the periphery of the construction of buildings and other facilities should be not less than 0.6m.
  2.the minimum distance between the two tower cranes erected between the end of the boom should ensure that tower cranes are low among the other tower crane tower with a distance of at least 2m; the lowest position in the high tower of parts (hook rose to the highest point or minimum balance arm portion) and the lower tower crane in the highest position in the vertical distance between the parts of not less than 2m.
  3. boom type and not yet attached jackup tower crane can not hang placards on the tower.

In engineering How to choose a concrete mixer types and models

      With more and more modern social engineering, the type of concrete mixer is also increasing, some people in their own works or construction do not know how to choose the right concrete mixer.
Concrete mixer choice are mainly three kinds, namely, the amount and duration requirements according to project selection, according to the design of concrete type selection, according to the characteristics and composition of concrete consistency, choose.
1. according to the quantities and duration required to select concrete projects large and long duration, should use a medium or large stationary concrete mixer or mixing station. Such as small quantities of concrete and the duration is short, medium and small portable mixer should be chosen.
     2. according to the type of design choices concrete mixing concrete plastic or semi plastic type when, should use self-loading mixer. Such as mixing concrete high-strength, lightweight when dry and hard or concrete, should use forced mixer.
     3.according to the characteristics and composition of concrete consistency, consistency of selection such as mixing concrete aggregate size small and large, should use larger capacity since the fall mixer. Such as mixing consistency when large aggregate size large concrete mixing tube should be selected from the drop faster speed mixer. Large aggregate size as consistency hours, should use forced mixer or in small capacity cone reverse the material mixer.

Tower crane disassembly steps

After the tower crane use, often it means the main part of the building was completed, entered the phase of interior decoration. However, this period is often high incidence of accidents. Therefore, our technical personnel in accordance with relevant experience, summed up the steps.
Hoping to help the majority of crane practitioners.
1.down hooks, remove the hoisting rope fixed end, roll back the rope.
2.lifting the car back to the boom heel fixed, luffing rope reel back, remove the cable luffing mechanism.
3. Remove the three counterweight.
4. Removal boom.
5. Remove the last piece of counterweight.
6. Remove the balance arm.
7.disassemble cab.
8.dismantle the tower.
9. turntable fixing section and the rotation mechanism demolition.
10. the removed section and rotary turntable fixing mechanism.
11. removal of the tower: according to the program set up opposite the tower dismantled tower.
12.demolition crane chassis.
13.after the removal of tower crane parts required to break down and decompose transported from the scene.

What factors affect the productivity of concrete mixing plant?

   Concrete mix plant after 20 years of development, technology becomes more mature, from the original low efficiency, high energy consumption and efficient development of low-power today, concrete mixing plant market once again undergoing change, as now the real estate market boom sustained, concrete mixing station market also continues to heat up, now mixing plant productivity and a gradual increase in actual production what other factors affecting productivity mixing station it?
   Feeding time, stirring time and the material time, the user during use to check the valve and associated electrical components on a regular basis to ensure the organization run smoothly, connecting the powder hopper and mixer between is smooth, keep the material time, normal; the mixing time users should check the soundness of internal mixer blade lining, material delivery location, delivery period, the existence of the phenomenon of axle and stirring effect and time; for the material time, the general increase in the hopper capacity of concrete or concrete a hopper designed to store containers to reduce the discharge time.
   Users should be based on production capacity and transport distance mixing plant, equipped with a sufficient number of vehicles, and will not produce too much concrete progress not timely shipping, the impact of the project.
   To often mixing station equipment maintenance and management, so that the device is in the best working condition, routine maintenance checks for the presence of the security risks in a timely manner, and to be eliminated to ensure concrete mixing station to work safely and efficiently.