China supplier Tower Crane CE Certificate Self-Raising Tower Crane 5t 6t 8t 10t 12t 18t Construction Crane Tower

Product Description


Product Description

TAVOL have more than 30 years production history and more than 10 years of overseas business experience,  can supply other capacity tower crane from 4t to 18 t .

We have an independent research and development team.
All mechanical designers have a Bachelor Degree or above in mechanical engineering, more than 5 Years of experience in the cranes machinery industry, adopt the advance design concepts, and continue to innovate.

CHINAMFG brand tower crane applied CE certificate, the performance & technical specification is advanced in China, has reached the international advanced level .

We have exported to many countries, such as USA, Germany, Brazil, UK, Bangladesh,  Philippines, Sri Lanka, Vietnam, Maldives, Cambodia, Oman, Saudi Arabia, Sudan, Kenya, Guinea, Georgia, Indonesia, South America etc. 


Product Parameters

Model QTZ63-5571 Topkit Tower Crane
Lifting jib length 50 m
Max load capacity 5 t
Tip load capacity 1.0t @50m jib end
Mast 1.6*1.6*2.5 m 


>>> Safety Feature for Construction Building Tower Crane

1   Torque limiter it will warns when lifting weights reach to 90% of rated lifting torque.
When reach to 110% of the rated lifting torque, it will limit rising upwards and trolley.
2 Weight limiter Control the maximum lifting capacity.
lifting weight reach to 40% of the rated capacity, limit high-speed lifting;
lifting weight reach to 110% of the rated capacity, limit  the lifting up
3 Height limiter Control the lowest and highest extreme position of lifting hook
4 Slewing limiter Control the extreme turns number of turn left and right
5 Amplitude limiter Control trolley limit position of inward and outward
6 Overload protection If the material is over the capacity, the crane will give a sharp warning for protection itself
7 Emergency brake If the operation staff  encounter some emergency situation, we could start the emergency brake system to protection the related treasure
8 Control Method Room control or remote control to avoid any injury to the operation staff
9 Main lifting motor with thermal protection and currency protection

>>> Main Parts Brand We Use for Tower Crane


Other Capacity Crane We Have


Model Jib Length Max Load Tip Load
QTZ40 4208 42m  4t 0.8 t
4708 47m 4t 0.8 t
4808 48m 4t 0.8 t
QTZ50 5008 50m 4t 0.8 t
5571 50m 4t 1.0 t
QTZ63 5571 50m 5t 1.0 t
5013 50m 5t 1.3 t
5610 56m 6t 1.0 t
QTZ80 5613 56m 6t 1.3 t
6012 60m 6t 1.2 t
6012 60m 8t 1.2 t
QTZ100 6013 60m 8t 1.3 t
QTZ125 6015 60m 8t 1.5 t
6015 60m 10t 1.5 t
QTZ160 6516 65m 10t 1.6 t
QTZ250 7030 70m 12t 3.0 t
QTZ315 7040 70m 18t 4.0 t

Payment Terms

1. T/T
2. L/C
3. Western union


Our Advantages

1. We are manufacturer but also group company, which have more than 10 years of overseas business experience and more than 30 years of experience in designing and fabricate, the quality more steady.
2. All machines sold must be tested before shipment, 100% quality.
3. With CE certification.
4. 7*24 hours technical support by email, telephone or video online.
5. User-friendly English manual for machine using and maintain.
6. Spare parts will be offered for free.
7. Professional design drawing can be provided according to installation site request.
8. All the raw material from Baosteel , Laigang Group etc, guarantee good quality . 
The quality supervision department will casual inspection the raw material through the carbon and sulfur analyzer, Microprocessor-based analyzer, Arc combustion carbon sulfur Analyzer and so on.
9. Using the carbon dioxide arc welding+ argon welding, the welding quality is good and steady. 
10. All the steal structure raw material uses the Q355 Mn steel 
11. The design of cabin and maintenance platform are more humanized . 
12. The balance weight stacks can be changed according to the lifting arm length. It will be suitable for different working environment . 
13. The painting uses the sand blast technique ,it will conform the surface of the steel clean, improve the painting adhesive force .
All the parts will be painted 3 times , 1 time finishing coat and 2 times primer . 
14. Protecting device including the lifting limiter ,slewing limiter, trolley limiter ,weight limiter and moment limiter .
The wire rope used the prevention of breaking and skipping .
The trolley used the prevention of breaking the shaft and falling down . 
15. Using the top brand electric ,the stainless steel distribution box ,aviation plug . 
16. Professional guidance ,installation and training team

Packaging & Shipping

Steel structure in nude or packed by bubble. 

Electric part and easily demand parts packed by high quality plywood box or steel box


After Sales Service

Pre-sale Service
1. We can customize products according to client’s demand.Many styles of products for your choices.
2. High Quality + Factory Price + Quick Response + Reliable Service, is what we trying best to offer you
3. All of our products are produce by our professional workman and we have our high-work-effect foreign trade team, you can totally believe our service. 
4. We have more than 20 year experience in design and manufacture, we cherish every order from our honor
5. The details technical data and CAD drawing will provide you at first time.

After You Choose us
1. We will count cheapest shipping cost and make invoice to you at once.
2. Test each machine before delivery to ensure plants quality, then send out to you after your payment.
3. Our engineers are available to guide the operators abroad.
4. Strict quality control system, supervision the work to ensure the best crane for you.
5. Strict production line, make sure manufacture the goods on time.
6. Best cooperation forwarder provide the soonest and reliable service foe our goods.

After-sale Service 
1. We are very glad that customer give us some suggestion for price and products.
2. We supply you installation video to assist you to install the crane to help you save the installation cost
3. Send free spare parts within warranty time 
4. Provide Installation manual and operation manual ,electric drawing
5. 24*7 hours on line service 

Company Profile

Tavol Cranes Group is the professional manufacturer for tower crane and construction lift in China .

Our main businesss scope as below:
+ Top Kit Tower Crane,
+  Flat Top Tower Crane,
+  Luffing Tower Crane,
+  Building Hoists, 
+  Gondola/ Suspended Working Platform

Welcome to contact us if any inquiry you have . 
Ms. Kelley 


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After-sales Service: Install Service Avaiable
Warranty: 14 Month
Certification: CE, ISO9001
Condition: New
Maximum Lifting Height: 100-150m
Maximum Lifting Weight: 5t


Can you explain the role of temperature and pressure in injection molding quality control?

Temperature and pressure are two critical parameters in injection molding that significantly impact the quality control of the process. Let’s explore their roles in more detail:


The temperature in injection molding plays several important roles in ensuring quality control:

1. Material Flow and Fill:

The temperature of the molten plastic material affects its viscosity, or flowability. Higher temperatures reduce the material’s viscosity, allowing it to flow more easily into the mold cavities during the injection phase. Proper temperature control ensures optimal material flow and fill, preventing issues such as short shots, flow marks, or incomplete part filling. Temperature control also helps ensure consistent material properties and dimensional accuracy in the final parts.

2. Melting and Homogenization:

The temperature must be carefully controlled during the melting process to ensure complete melting and homogenization of the plastic material. Insufficient melting can result in unmelted particles or inconsistent material properties, leading to defects in the molded parts. Proper temperature control during the melting phase ensures uniform melting and mixing of additives, enhancing material homogeneity and the overall quality of the molded parts.

3. Cooling and Solidification:

After the molten plastic is injected into the mold, temperature control is crucial during the cooling and solidification phase. Proper cooling rates and uniform cooling help prevent issues such as warping, shrinkage, or part distortion. Controlling the temperature allows for consistent solidification throughout the part, ensuring dimensional stability and minimizing internal stresses. Temperature control also affects the part’s crystallinity and microstructure, which can impact its mechanical properties.


Pressure control is equally important in achieving quality control in injection molding:

1. Material Packing:

During the packing phase of injection molding, pressure is applied to the molten plastic material to compensate for shrinkage as it cools and solidifies. Proper pressure control ensures that the material is adequately packed into the mold cavities, minimizing voids, sinks, or part deformation. Insufficient packing pressure can lead to incomplete filling and poor part quality, while excessive pressure can cause excessive stress, part distortion, or flash.

2. Gate and Flow Control:

The pressure in injection molding influences the flow behavior of the material through the mold. The pressure at the gate, where the molten plastic enters the mold cavity, needs to be carefully controlled. The gate pressure affects the material’s flow rate, filling pattern, and packing efficiency. Optimal gate pressure ensures uniform flow and fill, preventing issues like flow lines, weld lines, or air traps that can compromise part quality.

3. Ejection and Part Release:

Pressure control is essential during the ejection phase to facilitate the easy removal of the molded part from the mold. Adequate ejection pressure helps overcome any adhesion or friction between the part and the mold surfaces, ensuring smooth and damage-free part release. Improper ejection pressure can result in part sticking, part deformation, or mold damage.

4. Process Monitoring and Feedback:

Monitoring and controlling the temperature and pressure parameters in real-time are crucial for quality control. Advanced injection molding machines are equipped with sensors and control systems that continuously monitor temperature and pressure. These systems provide feedback and allow for adjustments during the process to maintain optimum conditions and ensure consistent part quality.

Overall, temperature and pressure control in injection molding are vital for achieving quality control. Proper temperature control ensures optimal material flow, melting, homogenization, cooling, and solidification, while pressure control ensures proper material packing, gate and flow control, ejection, and part release. Monitoring and controlling these parameters throughout the injection molding process contribute to the production of high-quality parts with consistent dimensions, mechanical properties, and surface finish.

Can you provide guidance on the selection of injection molded materials based on application requirements?

Yes, I can provide guidance on the selection of injection molded materials based on application requirements. The choice of material for injection molding plays a critical role in determining the performance, durability, and functionality of the molded parts. Here’s a detailed explanation of the factors to consider and the guidance for selecting the appropriate material:

1. Mechanical Properties:

Consider the mechanical properties required for the application, such as strength, stiffness, impact resistance, and wear resistance. Different materials have varying mechanical characteristics, and selecting a material with suitable properties is crucial. For example, engineering thermoplastics like ABS, PC, or nylon offer high strength and impact resistance, while materials like PEEK or ULTEM provide exceptional mechanical performance at elevated temperatures.

2. Chemical Resistance:

If the part will be exposed to chemicals, consider the chemical resistance of the material. Some materials, like PVC or PTFE, exhibit excellent resistance to a wide range of chemicals, while others may be susceptible to degradation or swelling. Ensure that the selected material can withstand the specific chemicals it will encounter in the application environment.

3. Thermal Properties:

Evaluate the operating temperature range of the application and choose a material with suitable thermal properties. Materials like PPS, PEEK, or LCP offer excellent heat resistance, while others may have limited temperature capabilities. Consider factors such as the maximum temperature, thermal stability, coefficient of thermal expansion, and heat transfer requirements of the part.

4. Electrical Properties:

For electrical or electronic applications, consider the electrical properties of the material. Materials like PBT or PPS offer good electrical insulation properties, while others may have conductive or dissipative characteristics. Determine the required dielectric strength, electrical conductivity, surface resistivity, and other relevant electrical properties for the application.

5. Environmental Conditions:

Assess the environmental conditions the part will be exposed to, such as humidity, UV exposure, outdoor weathering, or extreme temperatures. Some materials, like ASA or HDPE, have excellent weatherability and UV resistance, while others may degrade or become brittle under harsh conditions. Choose a material that can withstand the specific environmental factors to ensure long-term performance and durability.

6. Regulatory Compliance:

Consider any regulatory requirements or industry standards that the material must meet. Certain applications, such as those in the medical or food industries, may require materials that are FDA-approved or comply with specific certifications. Ensure that the selected material meets the necessary regulatory and safety standards for the intended application.

7. Cost Considerations:

Evaluate the cost implications associated with the material selection. Different materials have varying costs, and the material choice should align with the project budget. Consider not only the material cost per unit but also factors like tooling expenses, production efficiency, and the overall lifecycle cost of the part.

8. Material Availability and Processing:

Check the availability of the material and consider its processability in injection molding. Ensure that the material is readily available from suppliers and suitable for the specific injection molding process parameters, such as melt flow rate, moldability, and compatibility with the chosen molding equipment.

9. Material Testing and Validation:

Perform material testing and validation to ensure that the selected material meets the required specifications and performance criteria. Conduct mechanical, thermal, chemical, and electrical tests to verify the material’s properties and behavior under application-specific conditions.

Consider consulting with material suppliers, engineers, or experts in injection molding to get further guidance and recommendations based on the specific application requirements. They can provide valuable insights into material selection based on their expertise and knowledge of industry standards and best practices.

By carefully considering these factors and guidance, you can select the most appropriate material for injection molding that meets the specific application requirements, ensuring optimal performance, durability, and functionality of the molded parts.

What industries and applications commonly utilize injection molded parts?

Injection molded parts find widespread use across various industries and applications due to their versatility, cost-effectiveness, and ability to meet specific design requirements. Here’s a detailed explanation of the industries and applications that commonly utilize injection molded parts:

1. Automotive Industry:

The automotive industry extensively relies on injection molded parts for both interior and exterior components. These parts include dashboards, door panels, bumpers, grilles, interior trim, seating components, electrical connectors, and various engine and transmission components. Injection molding enables the production of lightweight, durable, and aesthetically pleasing parts that meet the stringent requirements of the automotive industry.

2. Consumer Electronics:

Injection molded parts are prevalent in the consumer electronics industry. They are used in the manufacturing of components such as housings, buttons, bezels, connectors, and structural parts for smartphones, tablets, laptops, gaming consoles, televisions, cameras, and other electronic devices. Injection molding allows for the production of parts with precise dimensions, excellent surface finish, and the ability to integrate features like snap fits, hinges, and internal structures.

3. Medical and Healthcare:

The medical and healthcare industry extensively utilizes injection molded parts for a wide range of devices and equipment. These include components for medical devices, diagnostic equipment, surgical instruments, drug delivery systems, laboratory equipment, and disposable medical products. Injection molding offers the advantage of producing sterile, biocompatible, and precise parts with tight tolerances, ensuring safety and reliability in medical applications.

4. Packaging and Containers:

Injection molded parts are commonly used in the packaging and container industry. These parts include caps, closures, bottles, jars, tubs, trays, and various packaging components. Injection molding allows for the production of lightweight, durable, and visually appealing packaging solutions. The process enables the integration of features such as tamper-evident seals, hinges, and snap closures, contributing to the functionality and convenience of packaging products.

5. Aerospace and Defense:

The aerospace and defense industries utilize injection molded parts for a variety of applications. These include components for aircraft interiors, cockpit controls, avionics, missile systems, satellite components, and military equipment. Injection molding offers the advantage of producing lightweight, high-strength parts with complex geometries, meeting the stringent requirements of the aerospace and defense sectors.

6. Industrial Equipment:

Injection molded parts are widely used in industrial equipment for various applications. These include components for machinery, tools, pumps, valves, electrical enclosures, connectors, and fluid handling systems. Injection molding provides the ability to manufacture parts with excellent dimensional accuracy, durability, and resistance to chemicals, oils, and other harsh industrial environments.

7. Furniture and Appliances:

The furniture and appliance industries utilize injection molded parts for various components. These include handles, knobs, buttons, hinges, decorative elements, and structural parts for furniture, kitchen appliances, household appliances, and white goods. Injection molding enables the production of parts with aesthetic appeal, functional design, and the ability to withstand regular use and environmental conditions.

8. Toys and Recreational Products:

Injection molded parts are commonly found in the toy and recreational product industry. They are used in the manufacturing of plastic toys, games, puzzles, sporting goods, outdoor equipment, and playground components. Injection molding allows for the production of colorful, durable, and safe parts that meet the specific requirements of these products.

9. Electrical and Electronics:

Injection molded parts are widely used in the electrical and electronics industry. They are employed in the production of electrical connectors, switches, sockets, wiring harness components, enclosures, and other electrical and electronic devices. Injection molding offers the advantage of producing parts with excellent dimensional accuracy, electrical insulation properties, and the ability to integrate complex features.

10. Plumbing and Pipe Fittings:

The plumbing and pipe fittings industry relies on injection molded parts for various components. These include fittings, valves, connectors, couplings, and other plumbing system components. Injection molding provides the ability to manufacture parts with precise dimensions, chemical resistance, and robustness, ensuring leak-free connections and long-term performance.

In summary, injection molded parts are utilized in a wide range of industries and applications. The automotive, consumer electronics, medical and healthcare, packaging, aerospace and defense, industrial equipment, furniture and appliances, toys and recreational products, electrical and electronics, and plumbing industries commonly rely on injection molding for the production of high-quality, cost-effective, and functionally optimized parts.

China supplier Tower Crane CE Certificate Self-Raising Tower Crane 5t 6t 8t 10t 12t 18t Construction Crane Tower  China supplier Tower Crane CE Certificate Self-Raising Tower Crane 5t 6t 8t 10t 12t 18t Construction Crane Tower
editor by Dream 2024-05-03