China Linear Actuator Manufacturers, Suppliers and Factory - Customized Linear Actuator

Company Profile

Founded in 2006, Zhejiang Bigtork Valve Automation Co., Ltd. specializes in the design and manufacture of pneumatic and hydraulic actuators for rotary and linear valve applications. Since 2011, BIGTORK has supported domestic and international oil & gas and industrial projects, providing actuator sizing, application engineering, manufacturing, testing and technical support for demanding valve automation requirements.

Why Choose Us?

Proven Experience

Founded in 2006, BIGTORK has built extensive experience in the design and manufacture of pneumatic and hydraulic valve actuators. Since 2011, we have supported valve automation projects in domestic and international markets, serving a wide range of industrial applications.

Engineering Expertise

Our engineering team supports actuator sizing, configuration and application engineering for both standard and project-specific requirements. Proprietary sizing tools help ensure accurate actuator selection, while technical support is available throughout project execution and the product lifecycle.

Manufacturing Capacity

BIGTORK operates four dedicated actuator production lines with an annual production capacity of approximately 60,000 units. Advanced CNC machining centres and CNC lathes support efficient production, dimensional accuracy and consistent product quality.

Quality Assurance

Quality is controlled throughout material inspection, machining, assembly and final testing. Critical components are sourced from qualified suppliers, and every actuator undergoes final inspection and functional testing before delivery. Test documentation can be provided in accordance with project requirements.

Lifecycle Support

From actuator selection and project configuration to manufacturing, testing and after-sales support, BIGTORK works with customers throughout the equipment lifecycle. Our engineering and service teams provide responsive support to help ensure reliable actuator operation and efficient project execution.

Global Project Experience

BIGTORK has supported valve manufacturers, engineering companies and industrial customers across international markets. Experience gained from oil & gas and industrial valve automation projects enables us to respond to diverse application requirements and demanding operating conditions.

ZSS300 Pneumatic Linear Actuator
The ZSS300 is a single-cylinder, air-to-open pneumatic actuator designed for reliable linear valve operation in demanding industrial applications.
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FC Linear Pneumatic Actuator
This series of actuators consists of single-acting, linear-travel pneumatic actuators designed for the automated control of industrial valves, featuring an air-to-open design. Under normal air supply conditions, the actuator pushes the
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Double-acting Linear Actuator
The BIGTORK double-acting linear actuator is designed for high-load valve control applications. Featuring a double-acting pneumatic drive mechanism, it converts a stable air supply into powerful, smooth linear thrust, providing reliable
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Linear Valve Actuator
This device is specifically designed to verify the thrust performance of linear pneumatic actuators, enabling the direct measurement of the actuator’s linear thrust output under various operating conditions and at different angles.
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Side-Ported Single-Acting Linear Pneumatic Actuator
This single-acting linear pneumatic actuator features a side-ported air inlet configuration, with the air supply port arranged on the side of the actuator body. This design allows the air connection to better match on-site pneumatic piping
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Ip67 Linear Actuator
Ip67 linear actuator is a weatherproof and waterproof actuator protects it keeps out wind, rain, dust and water. This ip67 linear actuator allows IP65 IP66 IP67 even highest IP68 proof level that make it suitable in some harsh outdoor
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Ip68 Linear Actuator
Ip68 linear actuator is a weatherproof and waterproof actuator protects it keeps out wind, rain, dust and water. This ip68 linear actuator allows IP65 IP66 IP67 even highest IP68 proof level that make it suitable in some harsh outdoor
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Marine Linear Actuator
Linear actuator is a device that uses compressed air or liquid to push a piston for linear motion. It can convert pneumatic or hydraulic energy into mechanical force and is used to control the opening and closing of linear valves such as
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High Thrust Linear Actuator
High thrust linear actuator is a device that uses compressed air or liquid to push a piston for linear motion. High thrust linear actuator can convert pneumatic or hydraulic energy into mechanical force and is used to control the opening
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High Power Linear Actuator
A high power linear actuator is a mechanical device that can convert linear motion into rotational motion, or convert rotational motion into linear motion. Power linear linear actuators as a straight stroke actuator are widely used in
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What is Linear Actuator？

A linear actuator is an actuator that creates linear motion (i.e., in a straight line), in contrast to the circular motion of a conventional electric motor. Linear actuators are used in machine tools and industrial machinery, in computer peripherals such as disk drives and printers, in valves and dampers, and in many other places where linear motion is required. Hydraulic or pneumatic cylinders inherently produce linear motion. Many other mechanisms are used to generate linear motion from a rotating motor.

Benefits of Linear Actuator

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Precision: Linear actuators can provide very precise and repeatable motion, which is essential in many applications such as semiconductor manufacturing or medical equipment.

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Efficiency: Linear actuators are much more efficient than traditional methods such as hydraulic cylinders, which can waste a lot of energy through heat loss.

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Safety: Linear actuators are much safer than traditional methods, as they do not rely on high pressure fluids or gases which could leak and cause injury.

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Environmentally friendly: Linear actuators do not use hydraulic fluids or gases, which can be harmful to the environment. They are also often made from recycled materials.

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Cost effective: Linear actuators are typically more cost effective than traditional methods, due to their efficiency and lack of required maintenance.

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Versatility: Linear actuators can be used in a variety of applications, from automotive to industrial. They are also relatively easy to install and maintain.

Types of Linear Actuator

1.Stepper motor linear actuators – Are preferred by equipment designers who require high performance and endurance in a very small package.

2.Dual-motion - Provide independent linear and rotary motion from a single compact actuator package. This type of actuator is an ideal replacement for bulky and complex mechanisms.

3.Can-stack stepper motor linear actuators - Provide a broader range of thrust and speed to address a wider range of applications.

4.External linear actuators – Affix the lead screw onto the shaft of the motor.this type is commonly chosen to power linear slide systems in the 60-500mm stroke range.

5.Non-captive linear actuators – Locate the nut inside the motor and allow the screw to move linearly through the actuator.this type is common for stroke lengths of 30-200mm.

6.Captive linear actuators - Locates the nut inside the actuator body (like non-captive actuators) but the front side features a linear spline attached to the screw, which prevents the rotation of the screw and provides linear output.

7.Electro-mechanical actuators - Combine a motor with an external linear drive element, which could be a ballscrew, lead screw, rack and pinion, or belt.gearboxes and linear guide elements might also be included.

8.Hydraulic actuators - Are hydraulic cylinders with a piston that uses an incompressible liquid to produce unbalanced pressure on the piston to create linear displacement.

9.Pneumatic actuators - Use compressed air to convert energy into mechanical motion. They consist of a piston, cylinder and a valve or port, which can produce linear or rotary mechanical motion.

10.Voice coil actuators - Have magnets that generate a magnetic field which produces current that moves a coil to create motion in a shaft. The force of the motion is proportional to the turns of the coil.

Application of Linear Actuator

Industrial automation

In industrial automation, linear actuators are used for tasks such as conveyor belt control, robotic arm movement, and precise positioning of equipment. They enable efficient and accurate automation processes, enhancing productivity and reducing manual labor.

Robotics

Linear actuators play a crucial role in robotics, enabling precise movement and control of robotic arms, grippers, and joints. They allow robots to perform complex tasks with high accuracy, making them invaluable in manufacturing, healthcare, and research.

Medical and healthcare

Linear actuators are used in medical equipment such as hospital beds, dental chairs, and surgical tables. They provide smooth and controlled movement, ensuring patient comfort and precise positioning during medical procedures.

Automotive

In the automotive industry, linear actuators are utilized in various applications, including adjustable seats, headrests, sunroofs, and trunk opening mechanisms. They enhance comfort and convenience for vehicle occupants while enabling automated functions.

Home automation

Linear actuators are incorporated into home automation systems to control window blinds, door locks, and adjustable furniture. They allow homeowners to automate various aspects of their homes, providing convenience and customization.

Components of Linear Actuator

Power source
This AC or DC motor provides the energy necessary to drive the actuator. While electricity is the most common energy source, air and fluid energy are also used in some applications.

Power converter
The power converter delivers power from the source to the actuator based on measurements from the controller. Examples of industrial power converters include hydraulic proportional valves and electrical inverters.

Actuator
The actuator is the actual device.

Mechanical load
The load driven by the actuator is determined by a mathematical formula or a load capacity chart. Loads are calculated for vertical and horizontal configurations, as well as for movement along the X and Y axes. An actuator experiences two types of loads: static and dynamic. Static load refers to the force when the actuator is stopped, while dynamic load refers to the force when the actuator is in motion. Each type of load has its own capacity range.

Controller
The controller ensures proper system function by allowing an operator to input quantities and setpoints.

How to Maintain Linear Actuator

Keep within the rated duty cycle
Duty cycle is basically how much of the time an actuator is operational stated as a percentage. A duty cycle of 20% means that an actuator is rated to be in operation 20% of the time. For more information on duty cycles check out this article. The duty cycle of an actuator as indicated on the data sheet is designed to give you the best balance of usability and lifespan. If your actuator has a 20% duty cycle and you run it at 30%, it will probably do that just fine for a while, but over time it will shorten the life of the device.

Minimize side load
Standard linear actuators are designed to push and pull a load. They are not designed to be side loaded. Side loading an actuator can significantly reduce its life by increasing the internal friction which wears out the components much faster. If your application puts the actuator in a position where a side load will be present, consider using a linear slide rail in conjunction with your actuator. Another solution would be to use a track actuator. Track actuators are designed to take some side load and are ideal for these types of situations.

Stay within the recommended voltage
Actuators have a rated voltage for a reason. If you apply more voltage than is recommended for a unit it may run faster for a while. Ultimately however, this will shorten the life of the motor and cause premature failure of the device. It is better to purchase an actuator that is rated for the voltage that you intend to use or alternately, find a way to reduce the voltage in your application.

Watch your force
All things being equal, the lower the force that your application requires, the longer your actuator will last. An actuator rated for a 20lbs max is capable of pushing/pulling 20lbs of force. It is recommended that you operate your actuator as far below the max rated force as possible for maximum lifespan. If you require a high force consider moving up to a higher gearing ratio. This will reduce the speed of the device but increase its lifespan.

Avoid extreme operating conditions
It's best to avoid using actuators in environments with extreme heat, cold, dirt, or dust and moisture if possible. There are situations where a customer's needs can be accommodated. For example, in the past we have actuators with custom gear lube for low temperatures. For more information, check out our custom linear actuator page.

How Does a Linear Actuator Work?

Linear actuators are controlled through a variety of methods, typically involving electronic signals.

DC control

DC voltage is applied directly to the motor through a switch, relay, or other mechanism. Changing the polarity of the voltage supply allows the actuator to change direction.

PLCs (programmable logic controllers)

PLCs are popular control systems in many fields, including industrial automation. They can drive linear actuators with a variety of control signals, including 4-20mA current loops.

Pulse width modulation (PWM)

Switching a digital signal on and off produces the equivalent of an analog DC signal, which can command an actuator to move to a certain position. Varying the signal’s on-time vs. off-time (pulse width) will command the actuator to different positions. This is a common control method when using microcontrollers in embedded systems.

Servo control

Some actuators operate as direct plug and play replacements for standard rotary servos.
Some linear actuators integrate feedback sensors, such as encoders or hall-effect sensors, which provide real-time information about the actuator's position, allowing for closed-loop control and enhanced accuracy.

Selection Criteria

Linear actuators find their applications in a wide array of industrial settings, proving their versatility and importance in modern automation and mechanical design. When selecting the right actuator for your needs, considering several criteria ensures optimal performance and integration into your systems. Key selection criteria include:

Power source: Whether electric, hydraulic, or pneumatic, the available power source at your facility can dictate the most suitable actuator type.

Required motion: Decide if your application demands linear or rotary motion. Linear actuators are ideal for push-pull actions, while rotary actuators suit tasks involving rotation.

Precision and control

For applications requiring high precision, such as robotics or automation, electric actuators offer superior control and programmability.

Load capacity

Evaluate the load the actuator needs to move. Hydraulic and pneumatic actuators are typically suited for heavier loads due to their high force output.

Speed requirements

The necessary speed to complete tasks can influence your choice; pneumatic actuators often provide faster movement compared to electric and hydraulic actuators.

Environment

Consider the operating environment, as factors like temperature, humidity, and exposure to contaminants can affect actuator performance and lifespan.

The Evolution of the Electric Linear Actuator

The underlying design of the electric linear actuator hasn't changed much since its invention. However, the controls and programmability has become more intricate, with the development of new technologies. This means that many actuators can now be controlled from a single panel, allowing them to be programmed quickly and easily.

The electric linear actuator as we know it today was invented by Bent Jensen in 1979. Jensen was a Danish businessman who was trying to think of an idea to save his failing agricultural business. One day, whilst talking to an old friend who had a disability, Bent came up with the idea to develop an electric actuator that could adjust the wheelchair.

Since this pivotal moment over 40 years ago, electric linear actuators have continued to evolve as a result of developments in technology. They are now more accurate and more reliable than ever before, enabling precise positioning in almost every single industry.

Our Factory

Bigtork® have covered an area of total 20000 square meters, which its workshop for machining, assemble, testing and its warehouse for raw material, semi-finished product and finished product.

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FAQ

Q: What does a linear actuator do?

A: Linear actuators convert rotational motion into push or pull linear motion, which can be used for lifting, dropping, sliding, or tilting machines or materials. Although the function of all linear actuators is the same, there are several different ways the motion is achieved.

Q: What is the difference between a linear actuator and a motor?

A: Think of actuators as devices that help produce linear motion and motors as devices that help produce rotational movement. Hence, some consider actuators as a type of motor. But a motor is not a type of actuator. Both are critical to powering industrial applications and have a purpose in the right setting.

Q: What happens when a linear actuator fails?

A: When an actuator fails, it could result in catastrophic explosion, spill, chemical release, property damage, power loss, environmental contamination, injury, or even loss of life. Actuators trigger immediate shutdowns which could result in costly production downtime.

Q: What is the most common linear actuator?

A: Electric Linear Actuators
The most common types of electric linear actuator are lead-screw, belt-drive and rack and pinion.

Q: Are linear actuators AC or DC?

A: Linear actuators can be powered by AC or DC electric motors and controlled by a variety of means like switches, potentiometers or programmable controllers. Some linear actuators are also equipped with sensors that provide performance feedback on position, velocity and force.

Q: What is the difference between a linear actuator and a solenoid?

A: The linear actuator's position remains fixed at its current position, even in the applied voltage absence. Feedback: Solenoids do not allow the rod position to be tracked, nor can the position feedback be implemented because the motion is in a single stage with a maximum position.

Q: Why are linear actuators so expensive?

A: Linear actuators are advanced systems built with high-precision components and a durable design, making them ideal for heavy-duty applications. Their superior technology and engineering contribute to the higher cost, but they offer significant value.

Q: Can linear actuators pull?

A: An electric linear actuator is a device that converts the rotational motion of an AC or DC motor into linear motion. It can provide both push and pull movements. This movement makes it possible to lift, drop, slide, adjust, tilt, push or pull objects with the simple push of a button.

Q: What is the main function of a linear actuator?

A: The purpose of any linear actuator design is to provide push or pull motion. This motion can be powered either manually or through an external energy source, such as air, electricity, or fluid.

Q: Why use linear actuator?

A: Linear actuators play a crucial role in robotics, enabling precise movement and control of robotic arms, grippers, and joints. They allow robots to perform complex tasks with high accuracy, making them invaluable in manufacturing, healthcare, and research.

Q: Are linear actuators self locking?

A: As mentioned, our linear actuators are not only self-locking but also compact, durable, fast, precise and noiseless. Capable of enduring over 1000 kilometers of movement or 20 million cycles, they offer a sustainable, long-lasting option for various needs.

Q: Where is a linear actuator used?

A: linear actuators are designed to provide smooth and precise linear motion, enabling accurate positioning and control. This is essential for applications that require precise movement, such as medical equipment, adjustable furniture, and industrial automation.

Q: Can you manually move a linear actuator?

A: The short answer is YES. In a given application, there are reasons why you may want the ability to backdrive an actuator: Machine Setup - This allows the mechanism to moved manually for relative positioning to another part of the machine.

Q: What are the three types of linear actuators?

A: The three forms of linear actuators are screw, wheel and handle, and cam. The screw type is controlled by the up and down motion of a screw winding and unwinding. Wheel and handle actuators get their movement from the force of a belt or chain that is attached to a shaft.

Q: Is a linear actuator a solenoid?

A: Linear Solenoids. Solenoids are another type of actuator that provide linear motion but come with their own unique quirks. A solenoid is composed of wire wrapped into an electromagnet coil with a rod (often called the plunger) through the centre of this coil.

Q: How accurate are linear actuators?

A: Mechanical actuators work in the range of moderate to high speeds. Accuracy– Piezo-electric and electro-mechanical linear actuators have very high accuracy. Hydraulic and pneumatic actuators have poor accuracy, while mechanical actuators have accuracies ranging from poor to high.

Q: Do linear actuators push and pull?

A: An Electric Linear Actuator is a device that converts the rotational motion of an AC or DC motor into linear motion. It can provide both push and pull movements. This movement makes it possible to lift, drop, slide, adjust, tilt, push, or pull objects with the simple push of a button.

Q: Does a linear actuator need a motor?

A: Drive usually comes from an electric motor, often a servo type, but DC and AC motors are also used. Linear actuators can be supplied complete with motor and gearbox but are usually specified without these components.

Q: Is a screw jack a linear actuator?

A: Machine Screw Jacks
pull, and apply pressure as linear actuators manually or by means of gears or motors. Machine screw jack models can be used in single, tandem, or multiple arrangements because many feature the same gear ratio, allowing for unevenly distributed loads to be raised at the same speed.

Q: How do linear actuators fail?

A: What are the common factors in the failure of a Linear Actuator? Improper loading, failure to set limit switches, excessive duty and extreme environments may contribute to premature actuator failure.

Zhejiang Bigtork Valve Automation Co., Ltd. is one of the leading linear actuator manufacturers and suppliers in China. We warmly welcome you to buy customized linear actuator at competitive price from our factory. Contact us for more details.