It is a big mistake to ask the price when purchasing rotary hydraulic cylinders. The following 8 questions let you test out whether your supplier is professional!
Q1 What is the dynamic response time of your hydraulic rotary actuator?
The dynamic response of a hydraulic rotary actuator refers to its response speed and precision to external input signals. A high-quality hydraulic rotary actuator should respond quickly and accurately, with good control performance and stability. You can evaluate the dynamic response of the hydraulic rotary actuator by the following indicators: frequency response, adjustment time, and overshoot. Normally, the frequency response range should be between 10-100 Hz, the adjustment time should be between 0.1-1 second, and the overshoot should be as small as possible to ensure accuracy and stability. For example, a high-quality hydraulic rotary actuator should have ultra-low overshoot, typically less than 1 degree.
Q2 What is the load capacity of your hydraulic rotary actuator?
Bearing capacity refers to the maximum load that the hydraulic rotary actuator can bear. A high-quality hydraulic round actuator should have sufficient load-carrying capacity, be able to maintain stability and reliability and work efficiently under high-load conditions. You can evaluate the load-carrying capacity of a hydraulic rotary actuator by the following indicators: rated torque, maximum torque, load-carrying capacity, and static stiffness. For example, a high-quality torque rotary actuator should have a maximum torque of more than 10000 Nm and a load capacity of more than 500 kN. A qualified supplier should be able to provide rotary actuators with different loads to meet the application requirements of different customers on different machines and equipment.
Q3 How long is your hydraulic rotary actuator's warranty period and service life?
The service life refers to the service life of the hydraulic rotary actuator, that is, the time it can work continuously and stably. A high-quality rotary actuator should have a long life, be able to operate stably in different working environments and conditions, reduce maintenance costs and downtime, and improve equipment reliability and stability. You can evaluate the life of a hydraulic rotary actuator by the following indicators: rated life, failure rate, reliability, repair interval, and maintenance interval. For example, a high-quality hydraulic rotary actuator should have a rated life of more than 1 million cycles and a failure rate of less than 0.01%. The ultra-long warranty period is a performance of a supplier's confidence in the quality of its products. The warranty period of an excellent supplier's hydraulic rotary actuator is not less than 1 year.
Q4 Are the size and weight ratio design of your hydraulic rotary actuator lightweight?
A high-quality hydraulic rotary actuator should have a small size and lightweight design to improve its installation and use convenience. You can evaluate the mini rotary actuator by the following indicators: external dimensions, weight, and mounting method. A high-quality low-profile rotary actuator should have a compact design and small size, which can fit into smaller equipment and space constraints while being lightweight, which can reduce the burden on the equipment and energy consumption. Additionally, it should offer multiple mounting options for ease of installation and maintenance.
Q5 What are the parts of the finished product acceptance of your hydraulic rotary actuator?
The inspections of hydraulic rotary actuators should at least include (but not be limited to) the following points:
1. Surface acceptance: Check whether there are obvious cracks or collision marks on the surface of the oil cylinder, whether there are protective sealing plates at each oil port, whether the oil port thread teeth are damaged, and perform secondary tightening on the fastening bolts.
2. Test run: The tested oil cylinder reciprocates more than 5 times in the full stroke under the condition of no load, whether the output shaft of the oil cylinder moves smoothly, and whether the seal is damaged can be seen.
3. Minimum starting pressure: Under no-load conditions, hydraulic oil is injected into the oil cylinder port, and the relief valve gradually increases the pressure from zero. Observe the pressure gauge and record the minimum starting pressure of the cylinder under test when starting.
4. Torque test: Add the load of the output shaft of the oil cylinder to the rated load, and observe whether the output angle of the oil cylinder can reach the rated angle.
5. Pressure test: Rotate the output shaft of the tested cylinder to both ends of the stroke respectively. Adjust the overflow pressure to 30MPa, hold the pressure for 10 minutes, and check the leakage of each part.
6. Full stroke inspection: Make the output shaft of the cylinder under test rotate and stay at both ends of the stroke. Measure whether the total rotation angle is within the standard range used.
7. Internal leakage test: Rotate the oil cylinder to one end, loosen the oil pipe of the corresponding oil outlet, keep the pressure for 1 hour, and observe whether there is leakage; use the same method to detect the internal leakage of the other side.
8. Fatigue test: Install the oil cylinder according to the customer's application, and load the output shaft of the swing oil cylinder.
Q6 What are the safety devices on your hydraulic rotary actuator?
The safety performance of the rotary servo actuator, including the protection measures of the equipment, the safety of use, etc. A high-quality hydraulic rotary actuator should have good safety performance, which can prevent the operator from being injured and the equipment from being damaged. You can evaluate the safety of the hydraulic rotary actuator by the following indicators: protective devices, safety valves, emergency shutdown devices, and explosion-proof devices. A high-quality hydraulic rotary actuator should have complete safety devices and meet international safety standards to ensure the safety of equipment and personnel.
Q7 Why is your price not the lowest in the market?
Price is a key indicator of hydraulic rotary actuators, but not the only deciding factor, it should have a reasonable price to match its performance and quality. You can evaluate the price of hydraulic rotary actuators by the following indicators: performance, quality, lifespan, durability, and after-sales service. A cost-effective hydraulic rotary actuator not only has a reasonable price to meet the needs and budget of customers, but the manufacturer should also provide high-quality after-sales service to assist customers in market maintenance.
Q8 What is your real lead time?
The delivery cycle not only reflects the delivery time but also reflects the supplier's supply stability. High-quality rotary actuator manufacturers should have short lead times, stable supply chains, reliable logistics systems, and sufficient inventory of conventional models, etc., to meet customers' procurement needs and project progress.
In conclusion, hydraulic rotary actuators have numerous applications in diverse industries, including robotics, aerospace, and automation. These actuators have proven to be reliable and efficient solutions for a range of tasks that require rotational motion. As industries continue to evolve and adapt to changing demands, the importance of innovative and strategic solutions such as hydraulic rotary actuators will only increase. It is crucial for businesses to have a forward-thinking approach and prioritize investments in emerging technologies to remain competitive and meet the needs of the future.
WEITAI GROUP is China's TOP mobile hydraulics supplier, we are never afraid of any questions you ask, welcome to inquire!
