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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| Structure: | Piston Type |
|---|---|
| Material: | 20#Steel/45#Steel |
| Seals: | Packer/Hallite/Gapi |
| Warranty: | 2 Years Warranty |
| Oil Port: | NPT/SAE/BSPP |
| Acting Type: | Double Acting or Single Acting |
| Samples: |
US$ 60/Piece
1 Piece(Min.Order) | |
|---|
| Customization: |
Available
|
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|---|
Can single-acting hydraulic cylinders be used in construction equipment like dump trucks?
Yes, single-acting hydraulic cylinders can be used in construction equipment like dump trucks. Here’s a detailed explanation:
Dump trucks are commonly used in construction and mining industries to transport and unload bulk materials such as sand, gravel, dirt, and debris. These trucks are equipped with hydraulic systems that enable controlled lifting and tilting of the truck bed to unload the materials.
Single-acting hydraulic cylinders are often employed in dump trucks to provide the necessary force for raising and lowering the truck bed. In a typical dump truck configuration, one or more single-acting hydraulic cylinders are mounted between the truck chassis and the bed.
When it comes to raising the truck bed, hydraulic fluid is pumped into the pressure chamber of the single-acting hydraulic cylinder. The pressure forces the piston to extend, thereby lifting the bed to an inclined position for unloading. The weight of the materials being dumped assists in the gravity-driven tilting process.
Once the materials are unloaded, the hydraulic fluid is released or redirected from the pressure chamber, allowing the weight of the truck bed and gravity to retract the piston and lower the bed back to its original position.
The use of single-acting hydraulic cylinders in dump trucks offers several advantages:
1. Simple Design: Single-acting hydraulic cylinders have a relatively straightforward design, making them cost-effective and easy to maintain.
2. High Lifting Capacity: These cylinders can generate significant lifting force, enabling dump trucks to handle large loads.
3. Controlled Unloading: The hydraulic system provides precise control over the raising and lowering of the truck bed, allowing for controlled and efficient unloading of materials.
4. Durability: Single-acting hydraulic cylinders are designed to withstand heavy-duty applications and harsh operating conditions commonly encountered in construction environments.
5. Compatibility: Dump trucks are typically designed to accommodate single-acting hydraulic cylinders, making it easier to integrate these cylinders into the existing hydraulic systems of the trucks.
It is important to note that while single-acting hydraulic cylinders are commonly used in dump trucks, other types of hydraulic cylinders, such as double-acting cylinders, may also be utilized depending on the specific design and requirements of the dump truck.
In summary, single-acting hydraulic cylinders can indeed be used in construction equipment like dump trucks. These cylinders play a crucial role in enabling controlled lifting and tilting of the truck bed, facilitating efficient unloading of materials in construction and mining operations.
Can single-acting hydraulic cylinders be used in mining equipment?
Yes, single-acting hydraulic cylinders can be used in mining equipment. Here’s a detailed explanation:
Mining operations involve heavy-duty equipment that requires robust and reliable hydraulic systems to perform various tasks. Single-acting hydraulic cylinders offer several advantages that make them suitable for use in mining equipment. Here are some key points on the application of single-acting hydraulic cylinders in mining:
1. High Force Generation: Mining equipment often needs to exert significant force to perform tasks such as rock drilling, material extraction, or lifting heavy loads. Single-acting hydraulic cylinders are capable of generating high force in a single direction, making them well-suited for these demanding applications. The cylinders can generate the necessary force to operate hydraulic jacks, crushers, conveyors, and other mining machinery effectively.
2. Durability and Reliability: Mining environments can be harsh, with factors such as dust, dirt, debris, and extreme temperatures. Single-acting hydraulic cylinders are designed to withstand these challenging conditions. They are built with durable materials such as high-strength steel and can be equipped with protective coatings or seals to resist abrasion, corrosion, and contamination. This rugged construction ensures the longevity and reliability of the cylinders in mining equipment.
3. Compact Design: Mining equipment often operates in tight spaces or confined areas, such as underground mines. Single-acting hydraulic cylinders have a compact design, which allows them to be installed in restricted spaces without sacrificing performance. The compact size also contributes to weight savings, which is beneficial for mobile mining equipment that needs to be transported or maneuvered within the mining site.
4. Precise Control: Single-acting hydraulic cylinders offer precise control over force and movement. This is essential in mining operations where accuracy and repeatability are crucial. The hydraulic system associated with the cylinder allows for fine adjustments in pressure, flow, and speed, enabling operators to control the equipment’s actions precisely. This precise control enhances productivity, safety, and efficiency in mining operations.
5. Versatility: Single-acting hydraulic cylinders are versatile and can be used in a wide range of mining equipment. They are suitable for applications such as roof support systems, hydraulic shovels, loaders, haul trucks, hydraulic hammers, and more. The cylinders can be customized and integrated into different mining machinery designs to meet specific requirements.
6. Safety Considerations: Mining operations prioritize safety due to the hazardous nature of the work environment. Single-acting hydraulic cylinders can incorporate safety features such as overload protection, emergency stop mechanisms, or fail-safe systems. These safety measures help prevent accidents, equipment damage, or system failures, ensuring the well-being of mining personnel and the integrity of the equipment.
When selecting single-acting hydraulic cylinders for mining equipment, it is important to consider factors such as load capacity, operating conditions, maintenance requirements, and compliance with industry standards and regulations. Regular inspection, maintenance, and proper lubrication are also essential to ensure optimal performance and longevity of the cylinders in mining applications.
In summary, single-acting hydraulic cylinders can be effectively used in mining equipment due to their high force generation capabilities, durability, compact design, precise control, versatility, and safety considerations. These features make them well-suited for the demanding and challenging conditions encountered in mining operations.
How does a single-acting hydraulic cylinder handle variations in hydraulic pressure?
A single-acting hydraulic cylinder is designed to handle variations in hydraulic pressure in a specific manner. Here’s a detailed explanation:
1. Extending Stroke: During the extending stroke of a single-acting hydraulic cylinder, hydraulic pressure is applied to the pressure chamber through the hydraulic port. The pressure acts on the piston, causing it to move in the outward direction, extending the piston rod. The force generated by the hydraulic pressure is directly proportional to the pressure and the effective area of the piston.
2. Return Stroke: Unlike double-acting hydraulic cylinders that can generate force in both directions, single-acting cylinders rely on external forces or mechanisms for the return stroke. Once the hydraulic pressure is released or redirected, external forces such as gravity, springs, or other mechanical means push the piston back to its original position.
3. Handling Pressure Variations: Single-acting hydraulic cylinders are designed to accommodate variations in hydraulic pressure in the following ways:
- Pressure Limitations: Single-acting cylinders have pressure limitations specified by their design and construction. These limitations ensure that the cylinder can safely handle the maximum hydraulic pressure it is rated for without experiencing structural failure or damage.
- Pressure Relief Valve: In some applications, a pressure relief valve may be installed in the hydraulic circuit to protect the hydraulic cylinder from excessive pressure. The relief valve opens when the pressure exceeds a predetermined limit, allowing the excess fluid to bypass the cylinder and maintain a safe operating pressure.
- Sealing System: Single-acting cylinders have sealing systems that help contain the hydraulic pressure within the pressure chamber and prevent leakage. The seals, such as O-rings, rod seals, and wiper seals, are designed to withstand the pressure and provide an effective barrier between the pressure chamber and the return chamber.
- Controlled Fluid Flow: The hydraulic system controlling the single-acting cylinder may incorporate flow control valves or regulators to regulate the rate of fluid flow. These components can help manage pressure variations by controlling the flow of hydraulic fluid into the pressure chamber during the extending stroke.
By considering pressure limitations, incorporating pressure relief valves, utilizing effective sealing systems, and implementing controlled fluid flow, single-acting hydraulic cylinders can handle variations in hydraulic pressure and maintain safe and reliable operation.
editor by CX 2024-04-08
