What is the difference between an electric cylinder and a pneumatic cylinder?

Both an electric cylinder and an electric actuator are mechanical devices that can be driven by electricity. The main difference between them is how they move and what they are used in. An electric cylinder is a device that combines a hydraulic cylinder and an electric motor.

It drives the hydraulic cylinder motion through the motor, which can realize reciprocating motion and rotary motion. Electric cylinders can be used in applications that require high pressure and high flow rates, such as industrial robots, automotive manufacturing, aerospace and other fields. An electric actuator is a device that combines a motor and a screw.

It drives the screw to rotate through the motor, which drives the push rod to move. Electric actuators can be used in situations that require low pressure and high thrust, such as robotic arms, automated production lines and other fields. In addition, electric actuators can also be divided into two types: straight rods and curved rods, which are suitable for different application scenarios.

Straight electric actuators are suitable for occasions that require parallel movement, such as lifting platforms, stage machinery, etc.; The electric actuator of the curved rod is suitable for occasions that need to be turned, such as automated production lines, conveyors, etc. Therefore, although electric cylinders and electric actuators are both mechanical devices driven by electric motors, they have different modes of movement and application scenarios. Choosing the right actuator or cylinder depends on your specific application needs.

Difference Between Electric Cylinder and Pneumatic Cylinder:

The power of the electric cylinder is provided by an electric power source; The motion control of the electric cylinder adopts electrical control, which is more convenient and accurate.

The power of the cylinders is provided by compressed air; The control of the cylinder movement is controlled by pneumatic control elements.

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Common electric cylinders are classified as follows:

1. Linear type: The linear electric cylinder uses a coupling to directly connect the motor and the screw rod in the cylinder.

In series, the motor of the electric cylinder is installed on the same axis as the spindle of the screw rod. The structure of the whole cylinder block is compact, which reduces the gap between the cylinder block and the motor, and the performance and accuracy of control have been improved.

2. Switchback draft: through the synchronous belt.

It is driven by synchronous pulleys to realize the parallel connection of the motor and the screw rod, and the motor and the cylinder block are in a parallel relationship. It is suitable for places with small installation space, and has high control and control accuracy.

3. Vertical: The key pants motor passes through the corner reducer or worm gear.

The deceleration mechanism and the transmission screw rod are adjacent, and the axis of the motor and the axis of the screw rod are perpendicular to each other. The short overall length is also suitable for installation where space is limited.

From the perspective of the installation method of the motor, the electric cylinder can generally be divided into two types: one is the direct-connected electric steel, and the other is the switchback electric cylinder.

The direct-connected electric cylinder is the electric machine installed at the tail end of the electric cylinder block and connected by a coupling. The central axis of the motor and the central axis of the electric cylinder block are in a straight line. The motor can directly drive the screw rod to do a linear motion back and forth.

The foldback electric cylinder is installed in parallel between the motor and the electric cylinder block, and the two are connected in parallel. The motor and the electric cylinder block are connected by a synchronous belt synchronous wheel. When working, the motor drives the synchronous belt synchronous wheel to rotate, thereby driving the screw rod to work in a straight line back and forth.

Direct-coupled electric cylinder, folding electric cylinder.

High precision: The electric cylinder is connected with the control system such as the host computer to achieve high-precision motion control. The control accuracy is easily achieved, and the electric cylinder can be used in harsh environments without failure, with a protection level.

IP66 can be achieved.

2.Ultra-long life: electric drive, completely relieve the trouble of air leakage, but also provide a long service life.

3.Low noise and low vibration: electronic cushioning and braking control at the end, no impact, extremely low noise and vibration, reduce the impact on the overall equipment, and improve production efficiency.

4.High speed: up to 6m s, up to 10g acceleration.

Extremely high response speed and long service life even at high speeds.

5.Low-cost maintenance: The electric cylinder only needs regular grease lubrication to work in complex environments, and there are no wearing parts that need to be maintained and replaced, which will be better than the hydraulic system.

and the pneumatic system reduces a lot of after-sales service costs.

6.Environmental protection and energy saving: the current environment is more environmentally friendly, more energy-saving, and cleaner, and it is easy to connect with PLC and other control systems to achieve high-precision motion control.

Disadvantages of electric cylinders:

1. The impact load will affect the lead screw of the electric cylinder.

or bearings, which may affect the performance of the entire system. It can also cause problems that make it difficult to maintain the locked position or have gaps.

2. The electric cylinder can not bear the force from the radial direction, but can only act on the axial load, most of the electric cylinders on the market are light loads used in the automation industry, and the heavy ones need to take into account too many factors, thus restricting the electric cylinders in heavy loads.

The development of the industry.

Advantages of hydraulic cylinders:

Compared with the cylinder, it can withstand the pressure of 15 tons with a working pressure of 100MPa.

It is made of No. 45 high-quality carbon steel.

It has the characteristics of anti-leather labor strength, impact resistance, non-magnetism, etc., while its own weight is reduced 2 3.

3. Hydraulic cylinder.

The operating temperature range can reach -60 200 degrees, and its ultra-long life does not cause any failure after 6000 hours of operation.

4. The hydraulic cylinder is a masterpiece of hydraulic components and hydraulic technology, so its new structure and a variety of working methods are the biggest features of the hydraulic cylinder.

Disadvantages of hydraulic cylinders:

1. The design formula of the hydraulic cylinder is not reasonable, and a large safety factor cannot be obtained.

Therefore, the design theory of structure and strength of hydraulic cylinder is still lagging behind, which leads to certain limitations in its motion characteristics.

2. The force of the hydraulic cylinder is underestimated, and unsafe conditions are still inevitable, such as: the piston rod in the cylinder is broken.

3. Compared with the cylinder, the hydraulic cylinder is easy to leak oil (the working medium hydraulic oil is a large consumption.) ）

The positioning of the project should be comprehensively considered from all aspects, not only to deeply analyze the actual value and significance of the project in the road network, to analyze the environment and conditions of the project construction, but also to effectively combine the situation of regional economic construction. In fact, the following two ways are used: to prevent the use of too low technical standards, which will lead to the early saturation of the traffic volume of the highway before realizing the traffic life, and then to adopt the way of expansion, or to adopt the way of building a new road with the same channel; Prevent technical standards from being too high.

We should treat the problem of satisfying the characteristics of railway construction with an advanced vision, but if we are too advanced, the actual law of the development of things will be affected, and then the construction funds will be very tight, and ultimately the construction and development of the national economy will be affected to a great extent. 2.Emphasis on the functionality of the project.

In the actual implementation, we must pay attention to the degree of fit between the technical standards and the application function. The technical standards of the proposed project must conform to the actual bearing performance of the natural environment of the route corridor, otherwise the amount of work will increase, and the project cost will be increased. Preparation of estimates, budget estimates, budgets.

If the estimation results are to be more reliable and scientific, it is necessary to analyze all aspects of the project in depth, compare it with the project content of the comprehensive indicators, and make effective adjustments if necessary. The formulation of investment estimates for project feasibility studies should have good accuracy, but only by using scientific pricing basis can the project cost truly meet the actual needs of the project. 2.

In the process of formulating estimates and budgets, the engineering quantity of each stage must be strictly calculated, and it should be carried out in strict accordance with the principle of engineering quantity calculation. After the railway project budget estimate is formulated, it must be verified with the help of cost analysis. Based on the actual results of the estimate and budget, the corresponding economic indicators are obtained, and whether there is any contradiction between the indicators and the project standards and engineering quantities is analyzed; The indicators are compared horizontally with those of similar architectures of other projects, and their laws and reasons are analyzed, and the rationality of these laws and relationships is analyzed.

If there is an abnormal mutation, it is necessary to find out the cause at the first time, analyze the shortcomings in the design process, and the defects in the budget, and finally use effective measures to solve them.

The field involved is very wide, the previous few have been introduced, I will not introduce, the need to use telescopic linear motion of the place, may involve this thing.

1. Speed control:

The cylinder is controlled by adjusting the one-way throttle valve, which is only suitable for applications where the speed is not required. And the speed is affected by the pressure of the air compressor, the size of the solenoid valve and the orifice size.

The electric cylinder controls the running speed by controlling the current frequency, and can be continuously adjusted.

2. Intermediate positioning.

The cylinder is mainly composed of solenoid valves, controllers and stops, but the positioning accuracy is not high.

The electric cylinder can add any number of intermediate stop points at any position in the motion stroke according to the user's needs, with high precision.

3. Endpoint buffering.

The cylinder will be equipped with a buffer device at the end to reduce 1, speed control:

The cylinder is controlled by adjusting the one-way throttle valve, which is only suitable for applications where the speed is not required. And the speed is affected by the pressure of the air compressor, the size of the solenoid valve and the orifice size.

The electric cylinder controls the running speed by controlling the current frequency, and can be continuously adjusted.

2. Intermediate positioning.

The cylinder is mainly composed of solenoid valves, controllers and stops, but the positioning accuracy is not high.

The electric cylinder can add any number of intermediate stop points at any position in the motion stroke according to the user's needs, with high precision.

3. Endpoint buffering.

The cylinder is equipped with a cushion at the end to reduce shock.

The electric cylinder can be passed by a microprocessor.

Incoming and outgoing real-time position detection to achieve endpoint buffer control and less impact.

The electric cylinder can be used for real-time position detection through a microprocessor to achieve endpoint buffer control.

Electric cylinder: It is a modular product with the integrated design of servo motor and lead screw, which converts the rotary motion of the servo motor into linear motion, and at the same time converts the best advantages of the servo motor - precise speed control, precise speed control, precise speed control, precise torque control into - accurate speed control, precise position control, precise thrust control; A new revolutionary product that realizes a high-precision linear motion series.

Scope of application: Widely used in paper industry, chemical industry, automotive industry, electronics industry, mechanical automation industry, welding industry, etc.

Pneumatic cylinder: gas compressibility is large, expansion is also strong, easy to **, unsafe. Therefore, it is a pressure vessel at every turn, and it is necessary to design the right, the right to manufacture, the right to approve, and the 、.. to inspect

The responsibility of design and manufacturing is heavy and is tightly controlled. If you want to do pneumatics, you have to know this.

The pressure of the pneumatic is not very high, generally a few kilograms of square centimeters. Therefore, the strength will not be very large, and I am afraid of accidents. So it's all little things.

Cylinders, valves, and seals are similar to hydraulic pressure, and the buffer structure has multiple points, because the pneumatic speed is fast, and it comes in one stroke. (Of course, there are also high-pressure ones.) ）

Electric cylinders and hydraulic cylinders are common mechanical actuators, their main difference lies in the working principle and the way of use, today Minghui Automation will take you to learn more about the difference between electric cylinders and hydraulic cylinders. The working principle of the electric cylinder: 1

The electric cylinder is driven by a servo motor, and its movement is controlled by a controller. 2.The movement of the electric cylinder is determined by three parameters: position, speed and direction.

3.The movement of the electric cylinder can be precisely adjusted by the controller, which can achieve high-precision positioning and control. The working principle of the hydraulic cylinder:

1.The hydraulic cylinder is driven by a hydraulic pump, and its movement is controlled by a hydraulic valve. 2.

The movement of the hydraulic cylinder is determined by three parameters: position, speed and direction. 3.The movement of the hydraulic cylinder needs to overcome the viscous force and friction of the liquid, so its movement speed is relatively slow.

How to use electric cylinders and hydraulic cylinders: 1Electric cylinders are usually used in applications that require high precision, high speed, and positioning accuracy, such as industrial robots, automated production lines, etc.

2.Hydraulic cylinders are usually used in occasions that require high power and high torque, such as heavy machinery, excavators, etc. 3.

Electric cylinders can be positioned and controlled with high precision through a controller, while hydraulic cylinders need to rely on hydraulic valves to achieve the same function. To sum up, electric cylinders and hydraulic cylinders have their own advantages and disadvantages, and are suitable for different occasions. If high precision, high speed and positioning accuracy are required, electric cylinders should be selected; If you need high power and high torque, you should choose a hydraulic cylinder.

Compared to electric cylinders, pneumatic cylinders work reliably to extreme standards, are simple to operate in practice, and maintain the foundation without maintenance. The cylinder only needs to adjust the one-way throttle valve, and the steady speed control can be simply completed, which has become a major feature and advantage of the cylinder drive system software. Therefore, for customers who do not have high-precision and precise positioning regulations, most of them tend to apply cylinders from the perspective of application convenience.