DAHA Tower Crane QTZ6015

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Dahan group, established in 2000, is specialized in Tower Crane Hoist and Building Hoist. And registered capital reaches 100 million RMB. Dahan group has their own research and development department as well as production, marketing, service and financial department. The production capacity can be over 10000 sets and have earned the reputation as a leading manufacturer of tower crane and construction hoist.

Located in Jinan high and new technology industrial zone, office area is 3000square meters. Production base is in Jinan, Guangdong, Hunan. Total area  reaches 300000 square meters.

High-quality technological management team and first-rate production and detection equipment lay good foundation for the steady development of the company. Its technology and management personnel, including many senior engineers, have college degree or above, and skilled workers mostly have vocational school degree or above. The company also has over 200 general and special production equipment and over 300 measuring instruments for detection. The company passed the certification of ISO9001 Quality Management System in 2002, providing reliable guarantee for the management system and product quality.  

Our Dahan concern requirements of modern city construction and strive to provide products with advanced technology and rational price, furnish good technical support and pre and after-sales service for customers. We hope to create beautiful future with customers.

Corporate Vision

Vision:Become an ever-green construction machinery enterprise and maximally meet customers’ requirements
Core Values  
Quality: High quality, innovation, safety and reliability.
              High quality is the basis of the enterprise.
              Innovation is the soul of the enterprise.
              Safety is reverence to life.
              Reliability wins the trust.
Service: Customer focused, customers are existence value of Dahan people, do what we have promised.
Responsibility: Attentive and responsible, brave to undertake and fully perform individual, company and social responsibility.
Spirit
Hard Work:Industry, simplicity, perseverance and hardships are the source power of Dahan to achieve transnormal and leapfrog development.
Struggle:Concentrated reflection of brave advance, assiduous seeking, brave challenge and enthusiasm and progress of Dahan people.
Pioneering & Progress::Promote traditions, keep pace with the times, have the courage to innovate and pursue excellence in work

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Q:Lifting mechanism in tower crane: M5. Luffing mechanism: what does "M4" mean? Seek expert answers
It is the work level of the organization, representing the working hours and load sizes of the institution. See GBT/13752 or GBT/3811 for specific explanations.
Q:Tower crane technical condition GB/T 9462-1999 has been cancelled? If so, what is the new standard?
Standard number: GB/T 5031-2008Standard Name: Tower CraneStandard status: currentAlternatives: instead of GB/T 17806-1999; GB/T 17807-1999; GB/T 5031-1994; GB/T 9462-1999This standard specifies the nomenclature, classification and identification, technical requirements, test methods, inspection rules, information identification, packaging, transportation and storage, installation and climbing, and inspection of tower cranes.
Q:What is the insulation resistance of tower crane?
The lightning resistance of tower crane (tower crane) on the construction site shall be no more than 4 ohms.I. tower crane GB/T 5031--20085.5.5.9 lightning protectionIn order to avoid lightning stroke, the main structure of the tower crane, the motor frame and all the electrical equipment metal shell, wire metal protection tube should be reliable grounding, and its grounding resistance should be no more than 4 ohms. When multiple repetitive earthing is adopted, the grounding resistance shall be no more than 10 ohms.
Q:How often should the crane be inspected regularly?
Crane safety supervision regulations twenty-fourth in lifting machinery safety regular supervision and inspection cycle for two years, elevator and manned elevator safety regular supervision, inspection cycle for a year.Eighteenth lifting machines should check the lifting machines regularly, including annual inspection, monthly inspection and daily inspection:I. at least one full inspection shall be carried out annually on the lifting machinery used.The load test can be carried out by lifting the heavy load which is equivalent to the lifting weight, and checking the safety performance of the mechanism such as lifting, running, turning and amplitude according to the rated speed.Lifting machines which have not been used for more than one year should be examined comprehensively before use.Crane in case of four or more earthquakes or major equipment accidents, outdoor work crane after more than nine winds, should be used before a comprehensive inspection.
Q:How to explain and classify the types of tower cranes? What do QTZ80 and Q5510 mean?
80 is lifting torque of 800 KN.M, 5510 is 55 meters, big arm of the front crane 1 tons
Q:[tower crane] and [tower crane] what is the difference between, how to distinguish?
[tower crane] is a professional term, [tower crane] is a saying or abbreviation, also called "tower crane".
Q:What are the necessary safety devices on a tower crane?
(1) lift height limit position limiterFor cranes with variable boom angles, the lifting motion must be stopped immediately when the top of the lifting device rises to the 8OOmm at the lower end of the boom.For luffing cranes, lift the top of the hook to the lower end of the frame 500mm. The lifting movement must be stopped immediately.(2) lifting moment limiter and maximum lift limiter;When the lifting torque reaches 90% of its rated value, the lifting torque limiter shall be able to issue an acoustic or red light to indicate the alarm. When the lifting torque exceeds its rated value and reaches 108% of the rated value, the lifting direction and outward direction shall be stopped.If the weight and amplitude indicator are set, the numerical value should be correct, clear and eye-catching. The digital error shall not exceed 5% of the indicated value.When the lifting weight exceeds the maximum weight, maximum lifting weight limiter should emit light or sound alarm, when the load exceeds the maximum weight of 6%, should stop to enhance the direction of movement, but to allow institutions towards the down direction.
Q:How to calculate the pouring and maintenance of tower crane concrete in valuation?
Fixed price can be fixed. According to the design of construction organization. For a fixed item, reflected in engineering construction scheme.List price of the project, the quotation, measures, fees, quotations.
Q:What kind of tower cranes are available? How about the scope of all kinds of tower cranes?
Tower crane is divided into fixed tower crane, mobile tower crane, jack up tower craneThe mobile tower crane is divided into track type, tire type and automobile typeThe jack up tower crane is divided into two parts: internal climbing type and attached typeUsage: loading and unloading concrete by hanging tank for general construction and installation
Q:Calculate the tower crane gantry crane
It includes electric hoist, big car running mechanism, bridge frame, support leg, electrical equipment and so on. Applicable to station, wharf, warehouse, freight yard, construction site, cement product yard, factory, hydropower station and other outdoor work place, also suitable for indoor workshop work

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