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Welded Hydraulic Cylinders

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What is a Standard Welded Hydraulic Cylinders?

A Standard Welded Hydraulic Cylinder is a type of hydraulic cylinder that is welded together using multiple pieces of steel or other materials. These cylinders are typically used in hydraulic systems to convert fluid pressure into mechanical force, and they come in a variety of sizes and shapes to meet different application needs. Standard welded hydraulic cylinders are common in a wide range of industries, including construction, mining, agriculture, and transportation. They are designed to operate in extreme environments and withstand high pressure, making them an essential component in many hydraulic systems.

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Benefits of Standard Welded Hydraulic Cylinders

High Stiffness and Strength

Hydraulic cylinders are designed to withstand high-pressure applications, which makes them extremely durable and strong. This ensures that they can perform under extreme working conditions.

Low Maintenance

Hydro cylinders involve less maintenance compared to other types of cylinders, like pneumatic cylinders. They are designed to operate on hydraulic fluid, which reduces wear and tear, and eliminates the need for lubrication, making them easy to maintain.

Efficient

Hydro cylinders are typically more efficient than pneumatic cylinders, which means that they can perform more work with less energy. This reduces operating costs and leads to increased productivity.

More Power

Hydraulic cylinders can produce more power than other types of cylinders, due to their high-pressure design. This makes them suitable for heavy-duty applications.

Smooth Operation

The hydraulic fluid used in hydro cylinders provides a smooth and consistent operation, which helps to reduce stress on the cylinder, and therefore, reduces the risks of damage.

Versatile

Hydraulic cylinders are available in various sizes and designs, which makes them suitable for a wide range of applications. They are used in almost every industry, such as construction, mining, and agriculture.

Precise Control

Hydro cylinders provide precise and accurate control over the hydraulic fluid, thanks to the design of the valves and the hydraulic circuit itself. This ensures that the cylinder operates smoothly, and the load is controlled within safe limits.

Environment Friendly

Hydraulic cylinders are more environmentally friendly than pneumatic or electric cylinders, as they operate using a non-toxic and biodegradable hydraulic fluid. Also, the hydraulic fluid can be reused or recycled, which means less waste and impact on the environment.

Types of Standard Welded Hydraulic Cylinders

Single acting cylinders: A single-acting cylinder has a port that works in one direction only. When a liquid or a gas enters the cylinder barrel, the rod will increase in size. For the rod to return to its initial state, the cylinder may use an external force or a load string. An example of single-acting hydraulic cylinders is the hydraulic jack used in the auto industry.

Double acting cylinders: A double-acting cylinder's ports are on both the rod and head parts. This design enables the hydraulic cylinder to move fluids more efficiently. The ports at both ends will control the movement of fluids within the cylinder. Hence, liquids and gases in double-acting cylinders can flow in two directions.

Nested cylinders: The possible applications of hydraulic systems have significantly increased, and manufacturers are trying to develop more special designs. One of the latest designs involves putting together at least three cylinders. The combination of many cylinders creates a system with varying forces and speeds. Hence, hydraulic cylinders can do many things during a single stroke.

Rotating cylinder: All the cylinders above don't rotate, which may limit their applications in many industries. That is why some manufacturers produce the rotating cylinder type with linear motion. The rotating cylinder design resembles that of a non-rotating cylinder in most aspects. The main difference is that the rotating cylinder contains a distributor component that can provide fluids to the rod and head ends of the cylinder. In addition, the rotating cylinder includes passages to allow the inflow of oil on both sections of the cylinder.

Low height cylinders: Low-height hydraulic cylinders may be ideal if you have limited space or want to move the cylinder around. The low-height cylinders have the exact working mechanism as many of the cylinders listed above but are lighter and smaller. However, you are only likely to find this type of cylinder in the single-acting model. Also, you can't use the low-acting hydraulic cylinder to perform activities requiring tremendous force.

Tie rod cylinders: The tie-rod cylinder has a threaded steel rod to stabilize the components of the hydraulic cylinder. These cylinders also come with end caps to block fluid leaks. Hence, these cylinders have many applications in the industrial and manufacturing sectors. Those who buy tie-rod cylinders can expect easy repair, assembly, and maintenance of the cylinders.

Application of Standard Welded Hydraulic Cylinders

Tie rod hydraulic cylinder for hay baler / bale press / hay bander

YHG1 Standard Welded Hydraulic Cylinders With Footstand(Стандартный сварочный гидравлический цилиндр с фундаментом)

Triple steps steel hydro jack cylinder China

Rotary hydraulic actuor piston oil cylinder(Ротационен хидравличен действащ бутален маслен цилиндър)

Construction: One of the most prevalent industries for hydraulic cylinder usage is construction.Construction sites are home to many different tools and equipment types, many of which rely on hydraulic systems. For instance, a hydraulic cylinder can assist in powering essential tools, such as forklifts, excavators, and bulldozers.

Waste management: In the waste management industry, hydraulic cylinder applications are seen in various equipment and systems such as loaders, collection equipment, and lifters. Hydraulic cylinders are commonly used here as they help provide the necessary torque to control these large machines.

Food industry: Another common application of hydraulic cylinder systems is in the food industry. In many cases, different types of hydraulic cylinders are needed to power equipment in this industry. For instance, a hydraulic pump can power equipment, such as forklifts to transfer materials.

Mining: Another popular hydraulic cylinder use is in mining, especially when it comes to an essential piece of equipment - the stacker reclaimer.A stacker reclaimer is a large mining machine involved in handling bulk materials. Since it can move multiple thousands of tons of aggregates every hour, it needs regular maintenance. This is where hydraulic cylinders come in, assisting in lifting the unit when things such as bearings need replacing.

Infrastructure repairs: Hydraulic cylinders are beneficial to use in different infrastructure repairs, including everything from lifting buildings to leveling bridges.
To lift large structures, such as buildings, hydraulic jacks are used in tandem with lifting systems to lift these heavy buildings. This is beneficial when the foundation of a building is in need of repair.

Metal production: Another hydraulic cylinder used is in metal production. Often, hydraulic presses containing hydraulic cylinders are used in metal production. These cylinders exert force on metal, allowing it to be cut, bent, drilled, and assembled into pieces. Some of the hydraulic-powered machines that make this happen are grinders, planners, honing machines, and gears.

Marine: Hydraulic cylinders are used in the marine industry in several ways, including handling equipment and placing heavy loads onto a ship.
When it comes to controlling a ship in the water, hydraulic cylinders often play a critical role. It’s essential that loads remain even, with even weight distribution. In order to address uneven ships, a lifting system and double-acting cylinder help slowly lower cargo into the vessel.

Agriculture: When it comes to the agriculture industry, a multitude of machines are controlled by hydraulic cylinders. This includes everything from tractors, to loaders, spraying equipment, ballers, heavy machines for planting, weeding, and harvesting, as well as skid steers.

Components of Standard Welded Hydraulic Cylinders

Hydraulic cylinder barrel: The barrel is designed to contain the pressure of the cylinder. This barrel is made from honed tubes which are made from Cold Drawn Seamless Tubes. This steel has to be suitable to be honed. Honing is an abrasive machining process used to produce a precision and smooth surface on the metal that is being honed. Honing is one of the main processes to manufacture a hydraulic cylinder tube. The inside surface of the tube should have a smooth inside surface, be durable and have a high precision tolerance.

Cylinder head (END CAP): The cylinder head, also known as the “blind end”. This part is inside the cylinder barrel and is not exposed to daylight, hence the name. This part encloses the pressure chamber from one end of the cylinder.

Hydraulic cylinder base or gland: This part encloses the pressure from the other end of the cylinder barrel. This part is also referred to as the rod end. This can be identified by an opening where the cylinder rod connects to. The gland is also used as a cylinder mounting component. Examples of these mounting components are the cap flange, gland trunnion and the gland clevis. The gland size is determined by the bending stress resistance required by the hydraulic cylinder.

Piston: The piston inside the hydraulic cylinder is used to separate the pressure zones inside the barrel. The piston is machined to fit rubber or metallic seals which can be single-acting or double-acting. The piston rod is attached through threads, bolts or nuts to transfer the linear motion. Depending on where pressure is applied on either side of the piston will cause the hydraulic cylinder to extend or retract.

Piston rod: Also known as the cylinder rod. This is made from hard chrome plated cold rolled steel. The rod is attached to the piston and the cylinder head. The piston rod connects the hydraulic cylinder to the machine component that is used to do work. The piston rod is made from hard chrome for its properties to be grounded and polished very well. This ensures a reliable seal which prevents leaks.

Seal gland: The hydraulic cylinder gland is fitted with a number of seals that prevent the pressured oil from leaking past the interface of the cylinder rod and the cylinder head. If you take the option of the seal gland this will give you the advantage of easy removal and replacement of all the seals needed to prevent leaks. The seals within the seal gland are the primary seal, secondary seal, wear bands, wiper, scrapper and the static seal.

Seals: The seals used within the seal gland are made specifically according to the cylinder working pressure, speed of the cylinder, operating temperature and the application of the hydraulic cylinder. These are dynamic seals and can be single-acting or double-acting. Hydraulic cylinders used in lower temperature environments use Elastomer seals made from nitrile rubber.

Process of Standard Welded Hydraulic Cylinders

The design phase, cylinder manufacturing: In the design stage, the requirement specifications of the cylinder to be designed are transformed into technical drawings describing the materials of construction, dimensions, tolerances, quality of internal surfaces, and coating methods.

Requirements of barrels: The barrel should have sufficient strength and enough rigidity. The barrel should also have smooth interior surfaces, high precision tolerances, and durable service life. The requirement specifications for a barrel in a hydraulic cylinder can be realized by a proper selection of barrel material.

Materials for barrels: There are many steel materials available in terms of their tensile strengths. A barrel for a hydraulic cylinder can generally be prepared from an annealed cold-drawn or hot-rolled seamless steel tube. The steel type is usually carbon steel. However, in applications with corrosive environments, stainless steel can be used.

Machining process (Boring) for barrels: Machining is a metal removal process that depends on boring, cutting and grinding operations to remove unwanted material from the barrel to achieve a final shape. The boring operation is the main process of machining the barrel for achieving dimensional and surface finish tolerances.

Precision machining of barrels: After cold drawing and heat treatment, the partly finished barrel is additionally prepared for improving the surface finish and the geometric form of the inner surface of the barrel using the following methods: (1) Honing process and (2) SRB (Skiving & Roller Burnishing) process.

Preparing pistons: The piston is first machined for correct sizing. It must then be quenched and tempered for hardness. Verify its hardness through a hardness test. The correctly-sized piston is, then, machined with grooves to fit seals and bearing elements. The piston is inseparably attached to the piston rod using threads, bolts, or nuts.

Preparing piston rods: The piston rod must be machined for obtaining the correct shape and size. First, it must be roughly machined. It must then be quenched and tempered for hardness. Verify its hardness. It must then be heat treated through induction hardening, carburizing, or nitriding method to improve its surface hardness. It must then be precision machined, finely ground, and polished to provide a reliable seal and prevent leakage.

Preparing cylinder end plates: The manufacturing process of a cylinder head with rod sealing, guiding, cushion, and porting arrangements, involves the inspection of the material certificate, rough machining, quenching and tempering, hardness testing, precision machining, internal and external threading, sawing, milling, boring and fitting, and final inspection.

Cylinder ports: On hydraulic cylinders, standard ports are SAE O-ring threaded ports. Another porting option is a four-bolt flange port. Yet other port options are NPTF dry seal threads and BSPP threads.

Coating, painting, and polishing: The outside surface of the barrel must be spray painted as per the relevant standards. Hard chrome coating is provided on the piston. The surfaces of piston-rod are often treated using techniques such as Nickel-Chromium plating, laser cladding, supersonic flame spraying, or thermal spraying for making it wear-resistant and corrosion-resistant.

Seals for cylinders: The selection of the right seal profile and material for a given application requires consideration of many factors such as the piston-rod and bore diameters, seal groove dimensions and gaps, etc.

Assembly of cylinder parts: The fitting section assembles all the components of a cylinder, such as a piston rod, piston, tube and seals, with the necessary tools and utmost care.

Quality control of cylinders: A strict quality control procedure should be in place in every step of the production process to meet the specifications.

Tests and inspections: The manufactured cylinder must undergo performance testing under load to confirm its specifications as per the requirement specifications. Ensure that all dimensions and technical requirements of the cylinder are as per the drawing. Arrange inspection by third-party agencies if required.

How to Maintain Standard Welded Hydraulic Cylinders

First things first--keep your hydraulic oil clean

Many hydraulic failures occur because of hydraulic oil contamination. This is important to prevent damage to your system and components. If hydraulic oil is contaminated, it must be thoroughly cleaned as soon as any contamination has been found. It is also best to fit high-efficiency filters and change them when necessary.

Undertake regular maintenance

Regular maintenance on your hydraulic cylinder is important for optimal performance. Make sure you keep a close eye on the condition of the cylinder rod for any signs of corrosion, pitting or wear. Too much moisture can cause corrosion; whether this is from the air or from within the hydraulic fluid itself. If water contamination occurs within the fluid, it can cause major failure of the component or system – the oil therefore needs to be thoroughly cleaned as soon as possible. Corrosion also encourages wearing of the seals, due to increased friction; pitting causes a similar problem.

Rotate or alternate cylinders

As with other hydraulic components, if the risk of downtime is not an option, it is always a good idea to hold another cylinder(s) either as a ‘critical spare’ or that you can alternate usage between regularly. This break between uses keeps the cylinders in good shape, despite possible particle contamination and harsh operating conditions. It is also wise to undertake maintenance on these cylinders when they are removed from the system, so that they can be repaired if necessary.

Maintain your cylinder accessories

Each separate part that makes up your hydraulic cylinder is just as important as the cylinder itself. For example, if a pivot pin or clevis is worn or damaged, this could cause slop and play within the joints of the cylinder. This leads to misalignment and wear or more permanent damage.

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Tonghesheng Hydraulic is a market leader in hydraulic cylinders and components. Over the years, Tonghesheng Hydraulic satisfies its customers with the highest quality products, the best possible price and perfect service. Customers worldwide rely on the outstanding know-how of Tonghesheng Hydraulic: Innovation, precision, perfection!

Frequently Asked Questions Standard Welded Hydraulic Cylinders

Q: Can welded hydraulic cylinders be repaired?

A: Yes, it is possible to rebuild a welded hydraulic cylinder. This typically involves disassembling the cylinder, inspecting its components for wear or damage, replacing any worn or damaged parts, reassembling the cylinder, and testing it to ensure proper functionality.

Q: Which is better welded hydraulic cylinder or tie-rod?

A: One of the key advantages of welded cylinders is their resistance to high pressure and heavy loads. The absence of tie rods allows for greater stability, ensuring reliable performance even in demanding applications. Additionally, the welded construction provides excellent resistance against external forces and impact.

Q: What is the most commonly used hydraulic cylinder?

A: Single-acting and double-acting cylinders are the two most commonly used types of hydraulic cylinders. What is the difference between these two types of cylinders? The simple answer is that a double-acting cylinder has both an A and a B Port.

Q: How do I choose a hydraulic cylinder size?

A: If you know the pressure input and force output you need but not the cylinder diameter (bore), you can find the right size by using the following equation: Force divided by pressure will yield the area at the piston base. So... If the force is 4000 lbs and the pressure is 1000 psi, the area will be four square inches.

Q: What controls a hydraulic cylinder?

A: A single acting cylinder controls movement by a fluid force in one direction, and the return process depends on external forces such as spring force or gravity. 2. Double acting cylinder: Structurally, both sides of the piston are supplied with the fluid of certain working pressure.

Q: What PSI should a hydraulic cylinder be?

A: Standard heavy-duty hydraulic cylinders are capable of handling pressures as high as 3000 PSI, which are typically required for hydraulic presses, automotive applications and other related industrial applications. Stroking distance requirements: Although custom stroke distances above 10 feet (3.05m) are possible.

Q: What makes a hydraulic cylinder faster?

A: Hydraulic cylinders go faster by increasing the displacement of the fluid. This can be done in a number of ways, but the most common way is to increase the pressure of the fluid. By doing this, you are able to push more liquid through the cylinder and make it go faster.

Q: How do you tell if a hydraulic cylinder is single or double acting?

A: A single-acting hydraulic cylinder includes just one port. This is where the hydraulic fluid enters and forces the plunger out in one direction. A double-acting cylinder includes two ports. One for the hydraulic fluid to enter and extend the plunger, and the other for retracting the cylinder.

Q: What is the best way to change the speed of a cylinder?

A: Increase air PSI, if possible, at the inlet of the 4-way valve by increasing the adjustment on the system pressure regulator. This will cause a higher rate of air flow into the cylinder, increasing its speed.

Q: How do you control the speed of a hydraulic cylinder?

A: By adjusting the resistance, or opening, of this valve, you can modify the rate of oil flow to a cylinder and, therefore, the speed of its piston rod. Since the Flow Control Valve increases the circuit resistance, the pump must apply a higher pressure to overcome this resistance.

Q: How do you troubleshoot a hydraulic cylinder?

A: Hydraulic Cylinder Troubleshooting: 4 Tips to Avoid Hydraulic Cylinder Failure
Keep the hydraulic fluid clean. ...
Monitor the pressure level inside the cylinder. ...
Be aware of the added stress on cylinders from side loads. ...
Check hydraulic cylinder seals and fittings for leaks.

Q: How long should a hydraulic cylinder last?

A: Around 15 to 20 years
On average, hydraulic cylinders are designed to have a lifespan of around 15 to 20 years. However, this can vary significantly depending on the specific application, the frequency of use, and the level of maintenance and care provided.

Q: What causes slow hydraulics?

A: Slow Operation
Air trapped in the system can be a problem, as well as restrictions in the line, due to dirty hydraulic filters. Another potential issue is badly worn hydraulic components such as pumps, motors, cylinders, and valves.

Q: How do you make hydraulic cylinders rise equally?

A: The most accurate way to synchronize hydraulic cylinders is with servovalves. Servovalves independently control each cylinder with electronic position feedback, and compare each actuator's position with all others. This is the most expensive way to synchronize cylinders but the most accurate.

Q: How do you know if a hydraulic cylinder is bypassing?

A: Testing for bypass on a bench can be done by fully extending the cylinder, turn off the pump and then remove the retract hose. Once the retract hose has been removed turn on the pump and operate the valve to extend the cylinder. Look for oil bypassing the piston and coming out of the retract port.

Q: What are the symptoms of air in a hydraulic cylinder?

A: Symptoms of Common Hydraulic Problems and Their Root Causes
Air in the hydraulic fluid makes an alarming banging or knocking noise when it compresses and decompresses, as it circulates through the system. Other symptoms include foaming of the fluid and erratic actuator movement.

Q: What are the 2 ends of a hydraulic cylinder called?

A: The end of the cylinder that the rod is sticking out of is called the rod end. The opposite end of the cylinder is called the blind end for some reason. From the outside you can see the ports, where hydraulic fluid can enter or exit the barrel, as well as the type of mounting connections.

Q: What are the four types of hydraulic cylinder?

A: 4 Types Of Hydraulic Cylinder To Consider
1) Single Acting Cylinders. ...
2) Double Acting Cylinder. ...
3) Tandem Hydraulic Cylinders. ...
4) Telescopic/Multistage/Ram type/Actuating Hydraulic Cylinders. ...

Q: Which pressure is used in hydraulics?

A: Hydraulic pressure is the amount of force applied to a liquid or gas by a pump. It is measured in pounds per square inch (PSI). Normal hydraulic pressure is between 3000 and 4000 psi. Hydraulic pressure is used in a variety of applications, such as irrigation, mining, oil drilling, and manufacturing.

Q: How do I know what size hydraulic cylinder to buy?

A: You can calculate the size of the cylinder(s) needed by dividing the total load by the amount of points. For example, a 100 ton load with one lift point would need at least a 100 ton cylinder while that same load with four lift points would require four 25 ton cylinders.

Tonghesheng Machinery is one of the competitive manufacturers and suppliers of high-quality standard welded hydraulic cylinders, and we are also equipped with a professional factory, welcome to buy standard welded hydraulic cylinders products from our company.