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KT Series
MDP Hydraulics
The high-rotational-torque hydraulic oscillating cylinder (also known as a rotating cylinder or oscillation actuator) is a compact hydraulic actuating component that directly converts hydraulic energy into limited-angle, high-torque rotational motion. It efficiently converts the linear reciprocating motion of the piston into rotational oscillation of the output shaft through an internal precise screw mechanism or gear-rack mechanism. This product is specifically designed for heavy-duty industrial applications that require high torque, precise angle control, and reliability. With its compact structure, high torque density, precise positioning, and flexible installation, it is widely used to replace the complex "linear cylinder + connecting rod/gear rack" transmission system, simplifying the mechanical structure, enhancing system rigidity and response speed.
The core of the oscillating cylinder lies in its internal motion conversion mechanism. Depending on the design, it mainly falls into the following two categories:
• Spiral spline type: The piston rod is machined with spiral splines, which engage with the fixed spiral sleeve inside the cylinder or the spiral splines on the output shaft. When the pressure oil drives the piston to move linearly, the spiral pair decomposes the linear force into a tangential force that drives the output shaft to rotate, thereby achieving rotational output. This structure typically provides extremely high torque and excellent shock resistance.
• Rack and pinion type: Inside the cylinder, one or more pistons are equipped with straight racks that mesh with small gears installed on the output shaft. The linear motion of the pistons drives the rotation of the gears, which in turn causes the output shaft to swing. This design enables a larger swing angle (such as 180°, 270°, 360° or even multiple rotations).
Regardless of the structure, its basic components include: cylinder block, end cover, piston (and piston rod), motion conversion mechanism (screw pair or gear rack), output shaft, bearing assembly, high-pressure rotary seal, and optionally an internal buffer valve and position sensor interface.
Thanks to the direct drive principle and the robust internal structure, it can generate torque that is far greater than that achievable by traditional linear cylinders of the same size through lever mechanisms, with an extremely high space utilization rate.
The starting torque is close to the running torque, and it can provide a stable high torque even at low speeds or when the machine is stationary.
Precise mechanical processing ensures high alignment accuracy of the motion conversion mechanism, resulting in high repeatability positioning accuracy and extremely small angular backlash (typically within fractions of a degree), making it ideal for applications requiring precise indexing or positioning.
By using servo valves or proportional valves in conjunction, precise closed-loop control of both speed and position can be achieved.
Heavy-duty bearing design: The output shaft support employs large roller bearings or composite bearings, which can simultaneously withstand significant radial force, axial force, and overturning moment.
High-pressure rotary seal: Utilizes specially designed rotary Gland rings, Stroh seals, etc. in combination to ensure long-term sealing reliability under high pressure (up to 250 Bar or higher) and continuous rotating conditions, with extremely low leakage.
Robust cylinder block: Made of high-strength steel, with anti-corrosion treatment on the surface, capable of withstanding harsh industrial environments.
Offers various installation methods, such as pedestal installation, front/rear flange installation, and output shaft forms (keyway, spline, flange), facilitating direct integration into the equipment.
It is equipped with an integrated built-in mechanical adjustable buffer, which can smoothly decelerate at the end of the stroke, reducing shock and noise.
Optional magnetic switches or analog position sensors can be equipped to detect and feedback the angle position of the output shaft.
The direct drive method reduces energy loss in the intermediate transmission process, resulting in high transmission efficiency.
The inertia is low, and the acceleration and deceleration responses are fast, which helps to shorten the equipment cycle time.
This product is the preferred solution for achieving rotational movements in numerous industrial fields:
• Material handling and automation: the flipping of robot end effectors, the rotation of pallets in stackers, the repositioning of fixtures on conveyor lines, and the 180° clamping and flipping of fixtures.
• Construction machinery: The upper rotating platform of the excavator (for small machines), the limited-angle swivel of the crane boom, and the mast adjustment of the drilling rig.
• Machine tools and manufacturing equipment: The indexing worktable of the machining center, the flipping of the welding positioner, the core rod rotation of the bending machine, and the rotational feeding of the stamping die.
• Vessels and marine engineering: steering gear, hatch opening and closing, crane rotation.
• Energy and Special Equipment: Quick opening and closing of valves (valves such as butterfly valves and ball valves), pitch adjustment of solar tracking brackets.
1. Required Torque: Calculate the peak torque and continuous working torque based on the load inertia, friction resistance, and acceleration requirements, and leave a certain safety margin.
2. Swing Angle: Determine the maximum rotation angle required.
3. Working Pressure: Match the working pressure range of the existing hydraulic system.
4. Installation Dimensions and Interfaces: Confirm the installation method, output shaft form, and connection method with the load.
5. Additional Functions: Are buffer and position feedback required?
1. Centering and Fixation: Ensure that the installation surface of the cylinder is flat and stable, and that the output shaft and the load shaft are precisely centered. It is recommended to use a flexible coupling to compensate for minor deviations and avoid applying additional radial force.
2. Oil Port Connection: Use appropriate hydraulic pipes and connectors to ensure a secure and leak-free connection. Pay attention to the relationship between the direction of the oil inlet and outlet and the expected rotation direction.
3. Exhaust: After installation, slowly allow the cylinder to reciprocate within its full stroke several times to expel the air inside the cylinder.
1. Check for any external leaks under system pressure.
2. Maintain the cleanliness of the hydraulic oil (recommendation: NAS 1638 7-9 grade or higher), as contaminants are the main cause of seal and bearing damage.
3. Regularly inspect the tightening status of the installation bolts and the condition of the output shaft connection.
4. Listen for abnormal noises during operation, as this may indicate wear on the bearings or internal mechanisms.
The high-rotational-torque hydraulic oscillating cylinder provides users with an integrated and high-performance solution for rotational drive. By simplifying the mechanical design, reducing the number of components, enhancing system rigidity and accuracy, it significantly reduces the complexity of equipment manufacturing, installation and maintenance. Its outstanding reliability and long service life reduce unplanned downtime, while the efficient direct drive helps to lower energy consumption. For engineers who seek high performance, high reliability and compact design of equipment, it is a fundamental core component for achieving heavy-load, precise rotational motion, and can directly enhance the competitiveness and production efficiency of the end equipment.
Example:
KT10 - 27 - 360 - Q Q Y J
| Description | Detailed Explanation |
| Series No. | Common series: KT10,KT20,KT30,KT40,KT50 |
| 100/Output Torque Value Divided By 100 | For example: the output torque is 4700nm, denoted as: 47, ie 100 |
| Output Rotation Angle | Standard angles are generally 180°, 360°, special angles can be customized |
| Torque Output Form | Q- Front flange,S- Double flange, Z- Shaft output,H- Spline Shaft |
| Mounting | Q- Front flange mount,H- Rear flange mount , D- Foot mounting,M- Clevis mounting |
| Counterbalance valve | Y- With ordinary Counterbalance valve, W-Without Counterbalance valve, A-Aluminum alloy Counterbalance valve |
| Seals | J- Imported normal temperature seals, G- Seals made in China, D- Withstand low temp, H- Withstand high temp |
Without the need for additional external bearings, the large, integral nylon composite bearing can withstand heavy radial, instantaneous and longitudinal loads.
The innovative sliding spline evenly distributes the load across all the teeth during operation, making it durable and possessing outstanding resilience to vibration loads.
The seal is achieved on a smooth cylindrical surface, effectively eliminating all leakage and maintaining the selected position without drift.
There is a large-diameter, hollow hole on the shaft, and a flange with internal threads is provided. The housing is installed together with the base foot through the drilled threaded holes.
The solid extrusion-type seal can effectively prevent dirt and moisture from entering, and the grease injection port ensures that the bearing is not contaminated.
6.Multifunctionality
The oscillating cylinder can be customized according to the user's requirements.
