Shotcrete problems and solutions 01

Solve problems of rotor jams, discharge elbow jams and feed delivery pipe jams.
In the process of operating shotcrete machine, there will be conditions like rotor jams, discharge elbow jams and feed delivery pipe jams. The following are reasons caused the jams and solutions.
First, the aggregate is oversize.To solve the feed delivery pipe jams caused by oversize aggregate, should first turn off the machine from rotating and close the pneumatic valve, removed the feed delivery pipe from the elbow end, open the valve of gas path to blow the stock of material out the rotor. Then check the feed delivery pipe, knock blocked section with a sticks, vibrate the tamper loose or empty it (note: turn down the pressure to zero before unpack the feed delivery pipe elbow or pipeline). Finally the feed delivery pipe to the elbow end again, to blow out the tamper with pressed air.

Second, the dry mix contains too much water.For too much water of dry mix, stop the machine, shut off the wind valve, if the discharge elbow is blocked, open the delivery pipe, clean the elbow and rotor material cavity, and reduce the water cement ratio.

Third, the press of convey airflow is too low.For the low conveying air pressure, stop the motor and ventilating duct. If the rotor jammed, seperate apart the blast pipe and upcast ventilation pipe, brush cleaning materials such as the rotor cavity.
Fourth, the fracture section of the blast pipe is too narrow, which leads the small blast volume of air compressor.For small fracture section of the blast pipe and volume, replace large sections of wind, and change for air compressor with large capacity.

Product Know-how-shotcrete machine

Product Know-how-shotcrete machine

DIY to Boost China Construction Machinery Market

The spiral growth of China construction machinery market has faded in the end of 2011. And more concerns go to the market situation of 2012. However, as half a year has passed by now, the depression of China construction machinery has disappointed the positive market expectation. According to the report on Performance of the leading global.Famous construction machinery enterprises in the first quarter of 2012, many manufacturers, such as, Caterpillar, Komatsu, Volvo, Atlas Copco, expressed that sales in China market from January to March 2012 had decreased in some degree. Moreover, the downturn of domestic market caused the overall decline of importing China construction machinery products and more focus on export market operation in the first quarter.

How ever, Zhengzhou Dayu machinery kept their high spirit in manufactureing and sales market.They have exported products like concrete pumps in construction and drilling rigs in mining and construction to Europe, Russia, the Middle East, Brazil, India, Australia, South Africa, Malaysia, Kazakhstan, Egypt, Peru etc. High quility products is the base of confidence and key of success. China manufacturers have a vast domestic market.It was crucial to utilise this domestic advantage, and then expand the sales affects worldwide.In the DIY age,on one hand, dayu machinery tried to make progress in independent research and development, on the other hand, they took advantages of human resourse of their factory to assemble the most optimizing machine. Some world famous auxiliary equipment are available for clients' choice. The meticulous service, efficient combination property and high quility attracts more and more customers.

Safe Operation of Rock Drilling Machine

The rock drilling rig is to work according to the principle of impact crusher. High-frequency reciprocating movement of the piston continues to impact on drill tail. Under the impact, a wedge-shaped sharp drill head will crush the rock and chisel it into a certain depth, to form a dent. When the piston returned, the drill turned a certain angle, the piston moved forward once again, and impacted the drill tail to form a new dent. The fan-shaped rock between the two dents was cut by the horizontal component of the drill head. The Pistons continue to impact the drill tail, and continuous input compressed air and water into the hole from a center hole of drill, and discharge rock slag from the hole then to form a certain depth of a circular drilling hole.

1. Inspect the integrity and rotation of the various drill components (including drilling machines, brackets or drill rig) before drilling, add necessary lubricating oil, check the air duct way, water flow, make sure them unimpeded and all connectors firm.
2. Do the wall tapping and roof sounding near the working section, check the working section if there are unfirm and unfixed stones, and make necessary processing.
3. The embrasure location of the working section should be make flat before drilling, preventing embrasure position skidding or shift.
4. To drill dry hole is strictly forbidden, wet drilling operation should be adhered to. When starting drilling, turning on water should be before the wind, when stop drilling turning off water should be after the wind. at the start of drilling should be operated in low-speed, when getting into a certain depth could be drilled in at full speed.
5. When drilling the drill man was not allowed to wear gloves.
6. When using the air-leg rock drill , pay attention to the standing posture and position, never rely on physical pressure and do not stand under the drill rod in front of the rock drill, to prevent broken drill wounding.
7. In the process of drilling if unusual sound, unusual discharge slag and water emerges, you should stop to check, identify the causes and eliminate them to continue drilling.
8 When pulling out of the rock drill machine or replacing the drill rod, the drilling machine can be operated in a slow speed, and pay attention to the drill rod position, to avoid the drill rod automatically off and assaulting, and promptly shut down the gas line.
9. When using air-leg rock drill, the drill top should be earnestly drilled tight to prevent the top slip wounding.

The 14th Shenzhen International Machinery Manufacturing Industry Exhibition Preparation

The 14th Shenzhen International Machinery Manufacturing Industry Exhibition Preparation
The 14th Shenzhen International Machinery Manufacturing Industry Exhibition will be hold between March 28th to March 31th in Shenzhen, China, which will last 4 days. It was organized by China Shenzhen Machinery Association and Shenzhen Dandelion Convention & Exhibition Co., Ltd.
This exhibition is UFI (Union of International Fairs ) approved event, started in 2000, held annually. It divided related industries and field into 4 groups,SIMM, SIMA, SICT, S.Mould. SIMM is short for Shenzhen International Metal Processing Exhibition, SIMA for Shenzhen International Mechanical Automation Exhibition, SICT for Shenzhen International Cutlery and Tools Exhibition, and, S.Mould for Shenzhen International Moulds Manufacturing Technology and Products Exhibition.

Every March, elite equipment manufacturers from home and abroad, from across the Taiwan Straits, Hong Kong, Macau, and the Pearl River Delta , and related chambers gather in Shenzhen, to take advantage the platform to expand their horizons and enhance brand recognition. Dayu machinery participated the 2011 exhibition, the construction machine electric dry-mix shotcrete machine attracted the interests and approval of many visitors and clients.The exhibition area is about 90,000 square meters, and the number of exhibitors was up to 1105, and visitors was more than 118 thousands. It was cited that 16.02% of the exhibitors were machinery manufacturing. This year, the 2011 exhibition has passed not very long, The preparation for the 14th exhibition in 2012 has began. The exhibition publication Ad recruiting is starting.

 Automatic Rendering Machine 
new popular product in construction--automation

Today I found worries and pity for construction workers for their hard work and painstaking. some people think there is no skill in rendering wall，it could be done step by step only by hand. Actually, the construction machinery industry has changed enormously, which correspondingly changed the methods of construction working. Some new construction machine is very popular,that is automatic rendering machine.

Automatic rendering machine (also called auto rendering machine or wall rendering machine) is one kind of unique construction machine often used after the building structure had been completed. The Automatic rendering machine could automatically render the blank-wall, which is ideally suitable for the plaster work in construction/building industry. It was belongs to the same classification as shotcrete machine, plaster machine and mortar pump, which share the similar work principle. It was modified from the shotcrete pump or gunite. This construction machine works with conventional cement mortar and brings it into a smooth, flat finish with variable and adjustable thickness to suit each plaster decoration.

Automatic rendering machine makes rendering easier, faster, and effortless when comparing to manual application. This machine was commonly used in construction in nowadays building automation. With only two worker assistant to load the materials into the tank of machine and assemble the machine in a regular period of time, it can automatically render the wall quickly and lay down the work load of more than a dozen of people.

Automatic rendering machine is capable to render and plaster on bricks and blocks with cement mortar, ready mix mortar, lime mortar or gypsum mortar. The construction machine was usually applied to render to form into first one or several coarse coats for walls and ceilings of building before coating or painting decoration. And the rough coats should be smooth and flat to meet the demands of project quality. So the machine specially suitable for flat section of wall and ceiling decoration and construction.

Assembling the automatic rendering machine is a necessary process to start rendering work according to the projects quality requirement, the height of the rendering section and the rendering thickness. Operation of Automatic Rendering Machine is very simple, and two workers could be competent to the assembling work and loading the suitable mixture at the project quality demand.

Steps    time
sept1    position the machine 60 seconds
Step2    Assemble machine 120 seconds
Step3    Move the machine to the wall for rendering 20 seconds
Step4    Adjust the vertical and horizontal level 20 seconds
Step5    Load any kind of suitable mixture to tank 30 seconds
Step6    Render one section 800 mm 60 seconds*
Remarks: * means the time of rendering up to 3 m height of wall with 800 mm width for one section.

The automatic rendering machine gradually take the place of manual plaster work ,which is the combination of time saving and money saving. It keeps up with ever changing world of building automation.
•    It can reach the very top of the roof.
•    Combine with the screw and conveying belt to achieve the vibrating compaction, no gault, no crack.
•    Fast positioning.
•    Hydraulic lifting methods to improve the stability of the machine.
•    If the cable fall off, the machine will stop automatically.
•    Large hopper, can load great amount of materials.
•    Saving valuable time for projects.
•    Increasing the productivity. Render up to 450 m2 / 8 hours.
•    Saving labor and other related cost.
•    The working condition, preparation and raw objects work with are all similar as manual rendering. Be portable, easy operation and maintenance. Be easy controlling of windows, corners, sockets.

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