Tower crane hoisting height regulations have?

Lifting height also called hook height is the vertical distance from the surface of the concrete foundation of the tower crane to hook. On the trolley tower crane, its maximum lifting height is immutable, the pitch luffing tower crane, its amplitude varies with different lifting height, lifting height than the minimum amplitude high top tens m, so the pitch luffing tower crane has an advantage in starting the lift.
Tower crane lifting height includes two parameters, lifting height of one tower installation free height, the second is the maximum lifting height of the tower crane attached when the tower crane when installing free height without attachment, usually tower crane It can reach 40 meters, to meet the needs of high-rise buildings below.
In order to prevent the ultra-high tower crane hook lifting accidents and damage to the equipment, on each tower crane was equipped with a height limiter, when the hook rises to 1-2 meters away from the boom hoist is automatically cut off power to prevent the hook continue to rise.
Lifting speed not only with the lifting mechanism, but also to override hook pulley about 2 to 4 times faster rope rope, single rope twice as fast than the 2 ropes.

 

The classification of tower crane

Divided by installation fast-loading crane, self-elevating tower crane and inner climbing tower crane
⑴ fast-loading crane itself with special towing and erection equipment, boom and tower can be folded together to achieve the overall haulage; to the site, but also it will soon be erected, so it should be more precise called overall haul quick installation of the tower crane.
⑵ from one tower lift tower crane is pieced together by the standard section, is actually assembled tower crane. But it also has jacking plus section system installed after jacking it can always add section increases the more prominent features. Since the biggest advantages lift tower crane is attached, can rise very high, which is particularly suitable for high-rise buildings and bridge construction, it is China play a leading role in the existing tower crane tower crane. Figure 3-3 is a schematic view of tower crane attachment. Self-elevating tower crane are on Rotary, because it is to be attached, do not allow the tower to rotate.
⑶ Within climbing tower crane tower is also assembled from standard sections made at the bottom of the wells have a special climbing equipment, it can climb high along the shaft, feeding height can be high, but do not add a lot of standards Section. And it is in the interior of the building, so the work back to the larger coverage.

 

JS twin shaft compulsory concrete mixer

  Composition according to user needs as the host medium-sized mixing station (House). You can mix dry hard, plastic, mobility, lightweight aggregate concrete and all kinds of mortar, a higher cost for the users of all ages. There for all types of large, medium and small precast plant and highways, bridges, water conservancy, port and other large industrial and civil engineering.
  JS-axis compulsory concrete mixer classification: JS500, JS750, JS1000, JS1500, JS2000
25 mixing station mixing station host is JS500,35 host material capacity of 750L, theoretical production rate of 35m3 / h, duty cycle time 60s, to the whole amount of water has a convenient control, strong power, power consumption is small, strong power built prevented vortex mixer knot material advantages solidarity warehouse.
   Said one mixing station master, and more for 50 mixing station, mixing station in one of 60 concrete mixer with a high degree of automation, high efficiency, low energy consumption, low noise, easy operation, discharge speed, lining and leaves a long service life, and easy maintenance.
   75 to be used in mixing stations, 90 mixing station hosts built a vortex mixer prevents the material knot solidarity has stirred strong positions, etc., good quality mixing of concrete, but also has low energy consumption, unloading fast, easy operation , easy maintenance.
   Said the two sides mixing console, the twin-shaft compulsory concrete mixer, concrete mixing station 120 is mainly used as the host, the machine uses a motor discharge, with supporting the use of dump trucks, it is the ideal equipment of various construction sites.
   Said the tripartite mixer, mixing station to provide support for a host, for all kinds of large, medium and small precast plant and highways, bridges, water conservancy, port and other industrial and civil engineering, can mix dry concrete, plastic concrete, fluidity concrete, lightweight aggregate concrete and all kinds of mortar, is a high-efficiency model, is widely used.

Screw conveyor's application and charcteristics

    Screw conveyor, mainly used in concrete mixing station project in transport cement, fly ash and other materials, mineral, feed, grain, construction industry uses a broader transportation equipment, screw conveyor are all made of steel , mainly used for a variety of high temperature powder, granular and small block and other loose materials, such as chemical, building material products.
The machine screw diameter is small, high speed, high throughput, accuracy, good transport conditions. Drive with gear reducer with torque, low noise, no oil leakage, long life, high quality seamless delivery shell, flange connection.

   Screw conveyor machine rigidity, large carrying capacity, at the time of delivery, whether it is the level of transmission, or large angle can be continuously fed, and free choice of work location and working conditions, easy disassembly repair, safe and reliable, is a new generation ideal environmentally friendly products.
And free to choose the operating position and work attitude, no dust leaking sinks, safe and reliable. After receiving the central tube, you can achieve complete balance, Double pitch design to reduce the extent of the material is compressed in transport, especially for long distance transport or cement powder and other materials.
   Its design, with torque, low noise, no oil leakage, long life characteristics. Install, easy to adjust the steering, while the high tightness, but also to ensure the connection strength.

Selection concrete mixing station batching metering

Concrete mixing station consists of mixing console, material weighing system, material handling systems, material storage and control systems and other five major systems and other ancillary facilities components. Here under the concrete mixing station batching selection principles:

1. Select the concrete mixing station in aggregate batching system
    Since the material is affected auxiliary equipment and space on the silo, hopper volume shall be optional larger. For mixing plant single silo volume is generally greater than 20m3, the use of a material on the belt or concrete warehouses but also then a large number, in order to reduce the footprint of stockyard. For mixing plant single silo volume is generally greater than 50m3.
    2.concrete mixing station metering systems Selection Considerations
    Weight measurement methods currently used, two forms of measurement and independent metering accumulation. Simple accumulation metering structure, easy maintenance, low loading height, but can not be controlled separately measurement accuracy. Individually controlled independent measurement accuracy, more complex structure, feeding height increases, the cost has increased.
    3.concrete mixing station generally fully enclosed, equipped with centralized dust removal device in cold areas should be considered cold winter construction requirements, do exterior insulation. Open and easy mixing station mixing station, due to poor environmental performance, currently the new concrete mixing equipment has been rarely seen in some areas has been prohibited.

Safe use of concrete pumps

Safe use of concrete pumps:
(1) with the stability of concrete pumps: Concrete pumps running state, and hydraulic truck crane is very similar, but something more concrete pump tops, large vehicle weight, center of gravity position may be higher, thus maintaining driving stability more negative, so we should be careful to drive.
(2) fabrics work state stability: concrete pump when the fabric is absolutely necessary legs, the legs do not fight are not allowed to expand the fabric arm. Therefore, fabric work is stable zone wiring center of each leg of the drawn rectangle. Since there is no counterweight concrete pumps, tipping torque, and torque limiter no protection, so job stability must be absolutely guaranteed. The approach is to increase the span between the legs, so tipping line relocation. Since the concrete pump is calculated according to the state-wide overhanging fabric work stability, it is not the lifting operation as there is uncertainty, so it will not tilt under normal circumstances. But absolutely not allowed to lift concrete pump, concrete pump design because there is no calculated lifting conditions, uncertainties brought no lifting into account, if you go with a concrete pump crane arm will have accidents.
(3) the turn-stop: concrete pump hydraulic hoses on the lot, as well as fabrics fittings, do not allow excessive one-way rotation, usually with a limit switch to the alarm, the allowed range is 360 degrees.
(4) on the job site requirements: concrete pump job should choose a flat, solid legs playing field, there should be some distance away from the slope. Its leg support reaction force is large, so to prevent landslides. You may not have high-voltage lines or bare wire to prevent electric shock in the operating range of the boom.

Care and maintenance of fine aggregate concrete pumps

    Fine aggregate for concrete pump to warm the construction features specially developed mortar conveying equipment for floor heating a large area filled with layers of fine aggregate concrete or mortar filling layer, high-efficiency construction.
     1. fine aggregate concrete pump for maintenance adjustments.
     2. often need to check fastening bolts and tighten the coupling parts of the examination.
     3. Check the hydraulic components if found fault, during any preflight check cause and repair the entire circuit.
     4. To pay attention to the construction of the inspection and maintenance of pumping: check motor current, temperature, should be within a predetermined range.
     5. after construction inspection and maintenance: After purged with compressed air or high pressure washing, if not short-term pumping operation, it should progressively dismantle the pipe, and then rinse with water inside and outside the tube, clamps and seals and other clean, ; comprehensive inspection of all fittings once, according to specifications and soundness properly stored separately.
     These are the fine aggregate concrete pump maintenance and maintenance, you want to know more about care and maintenance of fine aggregate concrete pump knowledge, you are welcome to come to counseling

Classification and characteristics of mobile concrete mixing plant

   Mobile concrete mixing plants, also known as mobile mixing plant. Mobile concrete mixing plants currently divided into traction and two kinds of trailer, towed chassis contains a complete front and rear axle; trailer chassis only the rear axle, the front tractor saddle placed on the bridge. Its main characteristics are three aspects.
1.enables fast, easy to move
2.other properties and mode of operation principle is the same for fixed mixing station (see HZS concrete mixing station)
3.mobile mixing station all parts transport unit dimensions are smaller than the size of the container space requirements, the entire station transport need three 40-foot containers.
  Mobile concrete mixing plants as a special form of a concrete mixing station construction project is moving public railways, bridges, ports, utilities and other advantages with the best models.

Tower crane hoisting height

  Tower crane lifting capacity varies with amplitude. From the weight of the product and the magnitude of the load torque is called, it is the main technical parameters of this crane. By rotating mechanism and slewing tower crane lifting height, large inertial mass turn and walk, it needs to have good speed performance, particularly the lifting mechanism required to light load fast, slow reload, install it Bit jog. In addition to using resistance governor general, but also often using eddy current brake, FM, change pole, SCR and electrical joint, etc. governor.
  To ensure safety, the tower crane has a good safety device, weight, amplitude, height and other restrictions devices such as load moment onwards, as well as travel limit switches, overhead lights, anemometer, wind rail clamp, ladder ring Body , walkways and railings. Good point lifting arm and the arm rod and pin. Prepare two sleepers adequate support frame or block. According to the order specified in the instructions lifting arm assembled and placed on the support frame or sleepers, then assembled a good jib boom lever. Car maintenance platform will be equipped with luffing jib trolley loaded rod under two strings. Press the corresponding magnitude every 10 meters installed signs and check the boom and the boom rod and cotter pin is all interspersed with firmly. Lifting crane arm assembly: first hanging in interviewing, grasp the focus, then formal lifting, with its roots in the same revolving pins bearing frame side hinge point connected.

Concrete mixing station stop stirring shaft causes and solutions

Concrete mixing station production line component parts of the agitator shaft is one of its components, stirring shaft raw material cement, gravel aggregate and water mixed concrete mixing plant and concrete mix into mixing for the mechanical parts in the whole production parts are parts plays an important scale. Various mechanical parts used in the past is inevitably fail. Failure agitator shaft is stopped appearing, abnormal sound, reducer temperature, noise, shaft leakage of plasma phenomena.
   Concrete mixing station stop stirring shaft is stopped or rotating agitator shaft slow phenomenon that causes that work equipment agitator shaft overload, overload of work equipment agitator shaft will cause mixing station of the agitator shaft setting does not slow - rotation.

Solving measures is to adjust the feed rate of the materials for it more than clear, but also the need to reduce the agitator shaft load, so that the normal operation of the concrete mixing station agitator shaft, you need to pair stirring blade cleaning equipment, if a foreign body is issued before the device will cause the agitator shaft stop shrill voice, the solution is to stop measures to check and remove foreign objects. More about the concrete mixing station of information, welcome your advice! Mainly by: mixing equipment, mixing transmission, feeding, unloading systems, water systems, electrical control system, consisting of a smooth system layout is relatively new compact domestic concrete mixer, the whole structure, beautiful appearance.

Concrete mixer mixing appliance few suggestions to clean up and repair

Firstly,Turn off the machine:

1, maintenance switch to "off" position, and with a key lock;
2, take good care of the keys without permission will be allowed to use;
3, will be labeled "is maintenance," the warning signs hanging in the access switch;
4, rotating parts shutdown process is complete.

Secondly, Gradually stop waiting for the stirring shaft rotation (in the bearing seat and the stirring shaft was observed between mixer shell) and unlock chain components:

1, the cleaning appliance stirring, remove deposits of mixed materials, especially around the blade fastening nut.
2. Loosen the fastening nut. If you can not let go, you can cut off the hex nut.
3. Remove the blade and clean the mixing arm support surface, remove sediment mixing materials.
4. Install the new blade mixing blade and liner, and at the same time set the radial and axial blade clearance. Radial and axial minimum clearance width of 2mm.
5, setting the blade gap, while the manual tray turn stirring apparatus while checking the blade clearance. The minimum radial clearance shall be measured between the outermost edge of the blade and the stirring tank wearable pieces.
6. After adjusting after all the stirring blades and liner blade, threaded fasteners must be tightened, and turn hand drive V-belt rotating stirrers, if the blades scratching stirred tank wearable pieces must retune.
   Make sure that all blade threaded fastener is tightened. Threaded fasteners not tightened blade will cause the blade loose, thereby causing disruption stirring, stirring shaft bending deformation, resulting in high maintenance costs.

Introduction for tower crane

Tower crane is a tower upright, the boom is hinged at the lower tower caps, can rotate 360 ​​° crane, commonly used in building construction and equipment installation, with a wide scope, from the high rise, big turning radius, work high efficiency, easy operation, reliable operation and so on. Tower cranes with lifting, vertical transport and short horizontal transport functions, are widely used in building construction, especially for high-rise construction, it is more important it is a lack of construction machines can not.
   Due to the high tower crane body, its stability on the poor, and demolition, equipment transfer more frequent and higher technical requirements, but also bring some difficulties to the construction safety, improper operation or illegal equipment, demolition is likely to happen tower cranes overturning plane crash accident, causing serious economic losses and personal injury accidents. To this end, machinery management, installation, disassembly, mechanical operators must draw from ideologically attached great importance to comprehensive grasp of the technical performance of the tower crane, master the correct installation from the business, disassemble, skills to operate, to ensure tower crane normal operation, to ensure safety in production.

Safety control points for tower crane

1.       The tower crane must address the characteristics of its type, the specification of the technical requirements before installation and removal, combined with the operating conditions to develop a detailed construction plan.

2.       Tower crane installation and disassembly operation must by obtain corresponding qualification, professional team of installation experience qualified, has issued by the relevant government department in charge of the certificate shall apply mutatis mutandis to rear can put into use.

3.       The subgrade and track laying type tower crane walking, must be in strict accordance with the requirements of the specification; stationary tower crane foundation construction design drawings shall be designed to calculate and construction details should be used as one of a special crane construction program content.

4.       crane torque limiter, high, horn, walking stopper, hook insurance, reel insurance retainer ladders and other safety devices must be complete, sensitive and reliable.

5.       multi-tower construction site when the job is, between the tower crane should be kept a safe distance to avoid a collision job.

6.       When a six and six more high winds and other inclement weather, should cease operations, will raise hook. Propelled crane rail clamp be clamped. After the snow, it should try hanging after confirming conducted only after the brake sensitive and reliable.

Introduction of HZS75 Concrete Mixing Plant

HZS75 concrete mixing plant is composed of ingredients, mixing , electrical automatic control and other parts consisting of concrete mixing equipment , which applies to more than medium -scale construction sites, ready-mixed concrete and precast factory production plant. Main features :
The use of modular construction , machine installation, removal is very convenient.
Mixing console and enhance the use of aggregate JS1500 -type twin-shaft compulsory concrete mixer , good mixing quality and high efficiency.
HZS75 mixing station to aggregate batching system uses PLD2400Q-Ⅲ type batching machine , measurement accuracy, high production efficiency.
Cement, water , liquid additive ingredients are used in electronic scales measuring high dosing accuracy.
Water pump pressure system uses a siphon principle , so that the water flow speed , spray evenly , the structural principle has won state patents .
Electrical control system main components are all imported , reliable performance , easy operation , print function , with air conditioning .

how to evalute the quality of concrete batching plant

As we all know , concrete mixing plants have several major components , there is no problem if these sectors , then the concrete mixing station no major quality problems.

1. If the self-loading mixer mixing tube that its discharge buckle ring runout does not exceed 1% of the inlet diameter , also check the shaker screen mixer on steel quality and the screen and sieve reasonable size and check the installation precision sieve .

2. The operation of the transmission system to be flexible, no abnormal noise.

3. The belt conveyor , bucket elevator and boom draglines and other gear to smooth operation to be flexible, high brake can no abnormal noise , no card chain.

4. The metering system is also very important to check , to check the sensitivity and accuracy of measurement systems.

5. Reduce machine elevated temperatures also note that to achieve temperature-qualified book .

6. weighing bucket out of material should be smooth , does not appear plot material , burrs and other phenomena .

7. safety valve leakage phenomenon can not appear.

8. quality cement silo qualified .

9. Matching circuit to reasonable installation, equipment installation to correctly.

The working principle and application of building hoist

      Hydraulic building hoist platform products in accordance with the work divided into Boom hydraulic building hoist, hydraulic building hoist, Mast pole hydraulic building hoist, hydraulic building hoist arm . Hydraulic hoists are folding arm lifts ( lifting platform ) , scissor hoists ( lifting platform ) replacement. It can be widely used in railway stations, docks , airports, hotels , telecommunications, municipal gardens , grain storage, cleaning companies, public building facade decoration, decoration or power system installation and maintenance and so on . The elevator has a light weight , self-propelled , electric start , self- leg , simple operation, large work surface , especially aerial work to cross barriers and so on.

      Hydraulic hoists are widely used in automobiles, containers, mold manufacturing, wood processing, chemical filling and other industrial enterprises and production lines , to meet the different needs of working height of lift , but can be equipped with various types of table form ( such as ball , roller , wheel , turning , tilting , telescopic ) , with a variety of control ( sub -action, interaction , explosion-proof ) , with a lifting smooth and accurate , frequent start , carrying capacity and other characteristics, an effective solution to various types of industrial enterprises in difficulty lifting operation , so that the production job easier.

     Hydraulic hoist platform is drive by hydraulic fluid pressure in order to achieve the lifting of the function , its scissor mechanical structure, so there is lift lifting high stability , large platform and a higher carrying capacity, making high-altitude operations range larger , and for many people simultaneously . It enables high-altitude operations more efficient , safer and more secure.