Product Description
About Us
Established in 1988 , HangZhou LD Machinery Co, LTD. (hereinafter referred to “LD”) is a leading manufacturer specializing in the design, research, development, manufacture and marketing in the hydraulic industry. Being one of major suppliers of customized components and cylinders for manufacturers spreaded all over the world, the company is committed to offer high quality products with competitive prices and excellent service worldwide.
Headquartered in HangZhou City, ZHangZhoug Province, the company wholly owns a subsidiary production factory named “HangZhou YUEWEI Hydraulic Technology Co., Ltd”, which covers an area of more than 380,000 square meters , possesses abundant technical strength and sound production management system, superior machining production equipment, strict and effective quality control system, advanced and excellent inspection instruments.
More than 35 years experience in machining industry, with over 10 experienced technical engineers and 150 skilled workers, LD has a senior engineering technical team with special skills and rich experience in product design, casting, forging, and CNC machining, can handle special material, structure, defect and processing, meet the evolving needs, and provide optimal solution and real one-stop service to customers.
Hydraulic Cylinder Producing Process
Step1: Quality Control on Raw Material
We have our own lab in factory, inspect the raw material and do the test. For every batch of material we received, we will ask supplier provide their certificate, and then cut them to do the test again to see if the results match the certification. Also, every batch we received, we will cut them into pieces to check the air bubbles. Once they are all qualified, we will accept it, and all detail information will be recording in our ERP system. We will also pay lot of attention on the salt spray test for chrome rod. Every month, we will cut the material, put them into test machine to see if it reach the requirement. All the result will be recorded at our QC department. If customer need, we can provide it.
Step2: Quality Control on Machining
we start doing components machining from 1988 with 36 years experience now and insist doing 100% inspection. We spend lots of money, invest on auto robots and machines. Now half of the producing line is by robot so that we can ensure our quality be stable good. For every part of the cylinder, we do 3 times inspecting. Firstly, workers will do self inspection. Secondly, we have tour-hour inspection checking the products, 2 times in the morning and 2 times in the afternoon, make sure that every step is good. After the products are all completed, we will do 100% inspection. For thread, for the tolerance, everything, we need double check. Also, we have specific warehouse just for the measuring tools. Every inspector have their own measuring tool and we will check the measuring tools regularly to make sure they are all in good condition, so that the measuring results will be convincing.
Step3: Quality Control on Welding
We are qualified to AWS certification, which is very popular in North American market. First, for the visual test, we will make sure that every components are welded good, look beautiful. And the second, we need to check the penetration. We have more than 15 years experience, we do know what kind of designing angle can make the cylinder welding strong. Once we finish the first article, we will cut it and analyse the welding to see if it is fulfill the groove. And then do the radiographic testing to make sure there is no gap inside. What’s more, we will do the ultrasonic test to check the program for the robot. Now 80% of welding is doing by robot. Once the program confirmed, no 1 can change it unless the welding manager, and they only have 5% right.
Step4: Quality Control on Assembling
For assembling, we have some difference with others. The brand we uses for seals are all those famous brand like Aston, Parker, Hallite. The cylinder we give to our customer has 2 years warranty. For our company, we engrave our part number and manufacturing date for the quality warranty. So no matter for seals or any others, as long as they are parts of cylinder, if it is under 2 years, we will take responsibility for them. And we will do the test for every cylinder like for pressure after we finish assembling.
Step5: Quality Control on Painting
We have our half auto painting line. Right now, we can paint about 1500 cylinders per day, which is about 1 container. Before we do the painting, we will do the wash first and for every cylinder, we will test for hardness, thickness and adhesion to make sure the painting are all good, which will be recorded into OQC report, print out and stick on the box, ship to you with your products.
Step6: Hydraulic Cylinder Packing
For every cylinder, we have the stick to show the detail information like bore size, stroke and working pressure. And we will use individual plastic bag packing. If customer need, we can also use individual carton box packing. We will fasten 1 floor after 1 floor with plat, so customer can only cut what they need and other layer will still be fasten. Moreover, there will be plywood pallet or plywood box for customer choosing. We will also send the loading picture to customer after we ship them to make sure everything is well loaded in China.
Packing Reference
Order Process
Enterprise Features
FAQ
Q1. What is LD product’s quality assurance?
100% inspection for each product before shipping with inspection rereport for tracking.
Q2: How long is the warranty on LD products?
The warranty is 2 years for general products since the date of shipment.
Q3: How LD deal with the quality problem during warranty period?
1. LD will take the corresponding cost caused by customer local reparing.
2. LD will provide the product by free if the repair cost is higher than the product value, but the freight involved shall be borne by customer side.
Q4: How to ensure the order can be shipped on time?
LD will send the “production schedule” every week after receiving customers’ orders. If any delays, LD will inform customers 3 weeks in advance, so as to facilitate the customer to arrange the schedule.
Q5: Does LD offer delivery service?
Yes. LD has deep cooperation with logistics companies all over the world to provide customers with quick and convenient “Door-to-Door services”,including sea, air and express.
Q6: How LD control the product quality?
1. Raw materials: We will test the material of each batch of raw materials we receive, and the piston rod will be tested with salt spray. This is to ensure that the material of our products meets the requirements at the beginning.
2. Processing: We have the leading machining equipment, and obtained ISO9001 certification.
3. Welding: Our factory is equipped with welding robots, and has obtained the AWS certification.
4. Assembly pressure test: 100% testing with OQC report for cHangZhou. The seals we use are: Hallite, Aston and Gapi
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| Certification: | ISO9001 |
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| Pressure: | Medium Pressure |
| Work Temperature: | Normal Temperature |
| Acting Way: | Double Acting |
| Working Method: | Straight Trip |
| Adjusted Form: | Regulated Type |
| Samples: |
US$ 300/Piece
1 Piece(Min.Order) | |
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| Customization: |
Available
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Can lift cylinders be used in both mobile and stationary applications?
Yes, lift cylinders can be used in both mobile and stationary applications. Here’s an explanation of how lift cylinders are suitable for both types of applications:
Mobile Applications:
In mobile applications, lift cylinders are commonly used in various types of equipment that require lifting capabilities. Some examples include:
- Forklifts: Lift cylinders are essential components in forklifts, enabling them to lift and lower loads efficiently. They provide the lifting force needed to raise the forks and transport materials.
- Cranes: Lift cylinders are utilized in cranes to lift and position heavy objects. They play a vital role in the vertical movement of the crane’s boom and ensure controlled lifting operations.
- Scissor Lifts: Lift cylinders are integral to scissor lifts, enabling the platform to be raised or lowered. They provide the necessary force to extend and retract the scissor arms, allowing for elevation changes.
- Aerial Work Platforms: Lift cylinders are employed in aerial work platforms, such as cherry pickers or boom lifts. They facilitate the vertical movement of the platform, enabling operators to access elevated areas safely.
Stationary Applications:
In stationary applications, lift cylinders are commonly used in various industrial and commercial settings. Some examples include:
- Material Handling: Lift cylinders are utilized in stationary material handling equipment, such as conveyor systems or lift tables. They enable the vertical movement of materials, facilitating efficient loading, unloading, or positioning.
- Automotive Lifts: Lift cylinders are employed in automotive lifts used in garages or car service centers. They provide the lifting force needed to raise vehicles for maintenance, repairs, or inspections.
- Industrial Machinery: Lift cylinders are integrated into various industrial machinery, such as hydraulic presses or assembly line equipment. They assist in lifting heavy components or adjusting the position of workpieces during manufacturing processes.
- Warehouse Systems: Lift cylinders are used in stationary warehouse systems, including vertical storage systems or automated retrieval systems. They contribute to efficient vertical movement of goods, optimizing storage and retrieval processes.
Whether in mobile or stationary applications, lift cylinders offer the necessary force and control to perform lifting tasks. Their versatility and adaptability make them suitable for a wide range of industries and applications.
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Can lift cylinders be used in automotive lifting equipment?
Yes, lift cylinders can be used in automotive lifting equipment. Here’s an explanation of how lift cylinders are utilized in automotive lifting systems:
Lift cylinders play a crucial role in various types of automotive lifting equipment, providing the necessary force to raise vehicles for maintenance, repairs, or inspections. Here are some common examples:
- Automotive Lifts: Lift cylinders are integral components of automotive lifts, such as two-post lifts, four-post lifts, or scissor lifts. These lifts are used in garages, auto repair shops, or car service centers to elevate vehicles to a convenient working height. Lift cylinders are responsible for the vertical lifting motion of the lift platform or arms, allowing easy access to the undercarriage or other areas of the vehicle.
- Parking Lifts: Lift cylinders are also employed in parking lifts, also known as car stackers or vehicle storage lifts. These lifts are used to maximize parking space in residential or commercial settings. Lift cylinders enable the vertical movement of the lift platforms, allowing vehicles to be stacked vertically for efficient use of space.
- Wheel Alignment Lifts: Lift cylinders are utilized in wheel alignment lifts, which are specifically designed for performing wheel alignment or suspension work. Lift cylinders raise the vehicle to a suitable height, enabling technicians to access the wheels and suspension components for adjustments or repairs.
Lift cylinders in automotive lifting equipment are typically hydraulic cylinders. They utilize hydraulic fluid and pressure to generate the necessary force for lifting heavy vehicles. The hydraulic system includes a pump, control valves, and hydraulic lines that deliver the pressurized fluid to the lift cylinders.
When activated, the hydraulic pump pressurizes the fluid, which is then directed to the lift cylinders through control valves. The pressurized fluid causes the pistons within the lift cylinders to extend, thereby lifting the platform or arms of the lifting equipment. By adjusting the flow and pressure of the hydraulic fluid, operators can control the lifting process and achieve the desired working height.
In addition to lifting capabilities, automotive lift cylinders are designed with safety features to ensure secure and reliable operation. These features may include safety locks, mechanical or hydraulic safety systems, and overload protection mechanisms. These safety measures help prevent accidents or equipment failure during the lifting process.
In summary, lift cylinders are commonly used in automotive lifting equipment, providing the lifting force necessary for vehicle maintenance, repairs, and storage. Their hydraulic operation and incorporation of safety features make them essential components in automotive service facilities, contributing to efficient and reliable vehicle lifting operations.
How does a lift cylinder handle variations in cylinder stroke length?
A lift cylinder is designed to handle variations in cylinder stroke length through its adjustable rod or piston. The stroke length refers to the distance the cylinder can extend or retract, and it can be adjusted to meet specific requirements in different applications.
In hydraulic lift cylinders, the stroke length can be modified by adjusting the position of the rod or piston within the cylinder. This adjustment is typically achieved by adding or removing spacers or by using adjustable stops. By changing the effective length of the cylinder, the stroke can be increased or decreased accordingly.
The adjustment of the stroke length allows the lift cylinder to accommodate different operational needs. For example, in material handling applications, where varying load sizes are encountered, the stroke length can be adjusted to ensure that the cylinder extends or retracts precisely to the required position. This flexibility enables the lift cylinder to handle a wide range of loads and adapt to different lifting or pushing scenarios.
In addition to adjusting the stroke length, lift cylinders often incorporate position feedback mechanisms. These mechanisms, such as linear transducers or position sensors, provide real-time feedback on the actual position of the cylinder. By monitoring the position, the control system can ensure accurate and precise control over the cylinder’s movement, regardless of the stroke length.
The ability to handle variations in cylinder stroke length is crucial in many industrial applications. It allows for adaptability, efficiency, and improved performance in tasks such as material handling, assembly, and automation. By adjusting the stroke length, lift cylinders can optimize their operation, ensuring that the required force and movement are achieved consistently.
In summary, lift cylinders handle variations in cylinder stroke length through adjustable rods or pistons. This adjustment capability, combined with position feedback mechanisms, enables precise control and adaptability in different applications. By accommodating different stroke lengths, lift cylinders can effectively meet the specific requirements of a wide range of industrial tasks.
What is a lift cylinder and how does it function in hydraulic systems?
A lift cylinder, also known as a hydraulic lift cylinder or hydraulic lifting cylinder, is a device used in hydraulic systems to generate linear motion and provide lifting force. It is a type of hydraulic actuator that converts hydraulic pressure into mechanical force to lift heavy loads. Here’s an explanation of what a lift cylinder is and how it functions in hydraulic systems:
A lift cylinder consists of a cylindrical barrel, a piston, and a rod. The barrel is a hollow tube that houses the piston and allows fluid to flow in and out. The piston is a cylindrical component that separates the barrel into two chambers. The rod, attached to the piston, extends from the cylinder to connect with the load or the mechanism being lifted.
The lift cylinder operates based on the principles of Pascal’s law, which states that pressure exerted on a fluid in a confined space is transmitted equally in all directions. Here’s how a lift cylinder functions:
1. Extension:
When pressurized hydraulic fluid enters one side of the cylinder (the chamber behind the piston), it applies force on the piston, causing it to move in the direction of the load. This movement extends the rod outward, lifting or pushing the load.
2. Retraction:
Conversely, when the hydraulic fluid is supplied to the other side of the cylinder (the chamber in front of the piston), the pressure differential causes the piston to move in the opposite direction. This retracts the rod, lowering or pulling the load.
3. Control Valve:
The flow of hydraulic fluid into and out of the lift cylinder is controlled by a directional control valve. The valve regulates the direction and amount of fluid entering the cylinder, determining whether the cylinder extends or retracts. This control allows for precise and controlled lifting and lowering of the load.
4. Force and Load Capacity:
The force generated by the lift cylinder is determined by the hydraulic pressure applied to the piston and the effective area of the piston. By increasing or decreasing the hydraulic pressure, the lifting force can be adjusted to meet the specific load requirements.
5. Application:
Lift cylinders are widely used in various hydraulic systems, including hydraulic lifts, cranes, forklifts, dump trucks, and construction equipment. They provide the necessary force to lift heavy objects, perform material handling tasks, and support heavy loads in a controlled and efficient manner.
In summary, a lift cylinder is a hydraulic actuator that converts hydraulic pressure into mechanical force for lifting heavy loads. It functions by utilizing hydraulic fluid pressure to move the piston and extend or retract the rod, enabling the lifting or lowering of the load. The control valve regulates the fluid flow, and the force generated by the lift cylinder is determined by the hydraulic pressure and piston area. Lift cylinders find extensive applications in hydraulic systems across various industries.
editor by CX 2024-03-26