Blog

02

2019-04

Development Dynamics and Trends of Hydraulic Transmission Technology in China

Technological innovation is of great significance for enhancing the scientific and technological competitiveness of nations, regions, and enterprises and for achieving sustainable development. In the early 1980s, China began to attach great importance to research on theoretical issues related to technological innovation. The scope of this research encompasses such areas as models and mechanisms of technological innovation, diffusion of technological innovation, industrial innovation and the economics of technological innovation, regional studies on technological innovation, as well as policies and systems related to technological innovation. After more than two decades of research, people have come to recognize the pivotal role that innovation plays in all aspects of production and have positioned innovation as the central element for enterprises, industries, and nations to gain a competitive edge. With the advancement and application of electronic technology, computing technology, information technology, automatic control technology, new processes, and new materials, hydraulic transmission technology has also been continuously innovating. Hydraulic transmission technology has become an indispensable and critical technology for industrial machinery, engineering and construction machinery, and cutting-edge defense products. Moreover, its ongoing development toward automation, high precision, high efficiency, high speed, high power, miniaturization, and lightweight design is key to continually enhancing its competitiveness against electric and mechanical transmissions.

Apr 02,2019

Development Dynamics and Trends of Hydraulic Transmission Technology in China

30

2019-05

Maintenance of DC Motors During Operation

For DC motors in operation, regular maintenance is essential to promptly detect any abnormalities and eliminate potential hazards, thereby ensuring the motor’s long-term safe and reliable performance. 1. During operation, the motor’s temperature, vibration, sound, and commutation status of each component should be checked regularly. Pay special attention to signs of overheating, discoloration, and the presence of a burnt insulation odor. 2. Use a listening rod to inspect the sounds emitted by various components, determining whether there are any friction noises between the rotor and stator beyond electromagnetic and ventilation noises. Also, check for unusual sounds coming from bearing shells or bearings themselves. 3. Inspect the connection points and insulators of the main circuit, paying close attention to any signs of overheating, discoloration, or abnormal odors such as burnt insulation.

May 30,2019

Maintenance of DC Motors During Operation

30

2019-05

Pay attention to the selection and proper techniques for cycloidal motors.

The harmonic drive motor is a device frequently used in today’s society. As we all know, every piece of equipment has its own strengths and weaknesses—and the harmonic drive motor is no exception. To avoid purchasing low-quality or unsuitable harmonic drive motors, it’s crucial that everyone master the proper selection methods for this product and understand exactly which aspects to focus on. Many of you may still be unclear about this, so today our staff has compiled the following information specifically to address this issue. 1. Assess the stability of the harmonic drive motor system The harmonic drive motor system is the heart of the harmonic drive mixer. The hardware configuration of the harmonic drive motor determines the stability of the CNC system, while the cutting process defined by the cutting control software dictates the numerical control performance.

May 30,2019

Pay attention to the selection and proper techniques for cycloidal motors.

30

2019-05

What are the key maintenance points for a cycloidal motor?

In fact, the gerotor motor boasts high precision and features automatic flow distribution with replaceable components. The motor can be used in both series and parallel configurations, and when used in series, it employs relief hoses other than those from Seeburg. Equipped with tapered roller bearings for enhanced support, this design provides a substantial radial load-carrying capacity, enabling the motor to directly drive mechanical systems. Such a design makes the use of the gerotor motor even more perfect. But how should the gerotor motor be maintained? For specific maintenance methods, please refer to the content below. Gerotor motors commonly experience four types of malfunctions: First is “psychosis,” which refers to intermittent performance of the hydraulic system—sometimes functioning properly, sometimes failing—and occasional absence of actuator movement; second is “cold sweat,” indicating severe system leakage; third is “tremor disease,”

May 30,2019

What are the key maintenance points for a cycloidal motor?

30

2019-05

Main applications of hydraulic motors

Hydraulic motors, also known as oil motors, are primarily used in injection molding machinery, ships, hoisting equipment, construction machinery, building machinery, coal mining machinery, mining machinery, metallurgical machinery, marine machinery, petrochemical equipment, port machinery, and more. High-speed gear motors boast advantages such as compact size, light weight, simple structure, excellent manufacturability, insensitivity to oil contamination, resistance to shock loads, and low inertia. However, they also have certain drawbacks, including significant torque pulsation, relatively low efficiency, small starting torque (only about 60%–70% of the rated torque), and poor stability at low speeds.

May 30,2019

Main applications of hydraulic motors

02

2019-04

Factors causing low-speed creep in hydraulic motors

1. The leakage volume is unstable in magnitude. Its leakage rate is not constant at every instant; rather, it fluctuates periodically as the rotor’s phase angle changes during operation. At low speeds, the flow entering the motor is relatively small, so the proportion occupied by leakage becomes relatively large. Consequently, this instability in leakage significantly interferes with the motor’s actual flow rate, thereby causing fluctuations in the motor’s rotational speed. 2. The magnitude of frictional force is also unstable. Normally, frictional force increases with rising speed; however, inside a motor operating at rest or at low speeds, the frictional resistance does not follow this pattern. When the operating speed slightly increases, the frictional resistance not only fails to increase but actually decreases instead. On the other hand, in a hydraulic motor, the interaction between the motor and the load is driven by the rise in pressure resulting from the compression of hydraulic oil. 3. The motor’s rotational speed is too low. When the motor’s speed is excessively low, unavoidable clearances between mechanical components lead to leakage. Moreover, the amount of leakage varies among different piston chambers, which causes an asynchronous sliding motion between the motor’s rotational speed and the crankshaft—manifesting macroscopically as the phenomenon known as “creep” in the motor.

Apr 02,2019

Factors causing low-speed creep in hydraulic motors

02

2019-04

Precautions for Using Hydraulic Motors

1. When the driven component has a large moment of inertia and it is required to achieve braking or forward/reverse motion within a short time, a safety valve should be installed in the return oil circuit to provide cushioning, thereby preventing sudden hydraulic shocks that could lead to damage or accidents. 2. When using a fixed-displacement motor, if smooth starting and stopping are desired, the circuit design should incorporate appropriate pressure control or flow control methods. 3. When a hydraulic motor is used as a power source for lifting equipment or locomotion systems, a speed-limiting valve must be installed to prevent heavy objects from falling rapidly or vehicles or other moving mechanisms from overspeeding when descending slopes, which could result in serious accidents. 4. Since hydraulic motors always have leakage, even if the inlet and outlet ports of the hydraulic motor are closed to achieve braking, there will still be a slow slip. Therefore, when prolonged braking is required, an additional brake mechanism designed to prevent rotation should be provided separately. 5. When starting under full load is necessary, attention should be paid to the value of the hydraulic motor’s starting torque, as the starting torque of a hydraulic motor is always lower than its rated torque. Ignoring this fact could prevent the working mechanism from operating properly. 6. Because the backpressure (outlet pressure) of the hydraulic motor’s return line is always higher than atmospheric pressure, the motor’s drain line must be routed directly back to the oil tank and cannot be connected to the hydraulic motor’s return oil line.

Apr 02,2019

Precautions for Using Hydraulic Motors

02

2019-04

The two features of a hydraulic winch

Simple operation. As far as the use of hydraulic winches is concerned, when you need to lift or lower materials, you can accomplish this task through extremely simple operations. Thus, it’s evident that this equipment boasts the characteristic of easy operation. Convenient use. Thanks to the hydraulic winch’s excellent adaptability to various types of materials and different application environments, it can lift and lower a wide range of materials in numerous diverse settings. Consequently, when using this equipment, you can readily start lifting and lowering materials in many different environments. This clearly demonstrates that the equipment exhibits the feature of convenient use in practical applications. Both simple operation and convenient use are key characteristics of hydraulic winches in terms of their practical application.

Apr 02,2019

The two features of a hydraulic winch

26

2022-08

ReeWo hydraulic's lecture series is now successfully launched!

In January 2021, Shandong ReeWo hydraulic technology co.Ltd. hosted the "ReeWo hydraulic Talks" program online, focusing on specialized explanations of hydraulic technology-related issues and providing technical support to a wide range of enterprises. The "ReeWo hydraulic Talks" program was broadcast on the WeChat official account, Toutiao account, and Douyin account of hydraulic motor engineers.

Aug 26,2022

ReeWo hydraulic's lecture series is now successfully launched!

26

2022-08

ReeWo hydraulic is kicking off its lectures—entering enterprises!

On January 6, 2021, at the invitation of a ReeWo hydraulic customer, the "ReeWo hydraulic Talks" program visited the company to provide hydraulic technology training. The four-day training course received unanimous praise from the participants.

Aug 26,2022

ReeWo hydraulic is kicking off its lectures—entering enterprises!
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