ABB SPHSS13 Hydraulic Servo Module

ABB SPHSS13 Hydraulic Servo Module

Overview

Product Definition and Function: ABB SPHSS13 Hydraulic Servo Module (Hydraulic Servo Module) is a key device for hydraulic system control. It is mainly used to accurately control the movement of hydraulic actuators (such as hydraulic cylinders, hydraulic motors), and to achieve high-precision position, speed and force control of mechanical components by converting electrical signals into hydraulic signals. In the field of industrial automation, such as machine tool processing, metallurgical equipment, injection moulding machines and other application scenarios, it can ensure the precise movement of the equipment and improve the production quality and efficiency.

Principle of operation

Electro-hydraulic conversion mechanism:

Signal reception and processing: The module first receives electrical signals from a controller (e.g. PLC or dedicated motion controller), which are usually analogue voltage or current signals representing the desired motion parameters of the hydraulic actuator, such as position, speed or force. The module has internal signal conditioning circuits that filter, amplify and linearise the input signals to improve the quality of the signal and ensure that it meets the requirements for subsequent processing. For example, for a weak analogue current signal, it is amplified to a suitable amplitude by means of an amplifier circuit, while high-frequency noise in the signal is filtered out.

Proportional solenoid valve drive: The processed electrical signal is used to drive a proportional solenoid valve. Proportional solenoid valve is the core component of electric - liquid conversion, it according to the size of the input electrical signal to control the displacement of the spool, so as to regulate the flow and pressure of hydraulic oil through the valve. When the electrical signal increases, the spool displacement increases and the hydraulic fluid flow and pressure change accordingly. This precise control relationship allows the hydraulic servo module to achieve fine regulation of the hydraulic system based on the input electrical signal.

Hydraulic system control process:

Flow and Pressure Control: By controlling proportional solenoid valves, the SPHSS13 module is able to precisely regulate the flow and pressure of hydraulic fluid to the hydraulic actuator. For position control applications, precise displacement of the hydraulic cylinder piston can be achieved by precisely controlling the flow of hydraulic fluid. For example, in a tool feed system for a machine tool, the module accurately controls the flow of hydraulic fluid to enable the tool to cut at a set speed and position according to the requirements of the machining process. In force control applications, the module regulates the hydraulic fluid pressure so that the hydraulic actuator delivers the desired force. For example, in the mould closing process of an injection moulding machine, the closing force is controlled to ensure that the mould closes tightly.

Feedback Control Mechanisms: In order to achieve highly accurate control, modules are often equipped with feedback sensors. These sensors can be displacement sensors (for position feedback), velocity sensors or pressure sensors. The feedback sensors feed the actual motion parameters of the hydraulic actuator (e.g. actual position, actual speed or actual pressure) back to the module. The controller inside the module compares the feedback signal with the input desired signal and adjusts according to the error signal. For example, if there is a deviation between the actual position and the desired position, the controller will adjust the electrical signal output to the proportional solenoid valve according to the size of the deviation, so that the hydraulic actuator moves in the direction of reducing the deviation until the actual position matches the desired position.

Performance characteristics

High-precision control capability: It can achieve high-precision control of the hydraulic actuator, the position control accuracy can reach the micron level, the speed control accuracy can reach a few millimetres per minute or even higher resolution, and the force control accuracy can meet the requirements of most industrial applications, such as in some occasions that require precise pressure control, the pressure control accuracy can reach 0.1MPa or less. This high-precision control makes it has an important application value in the field of precision machining, precision assembly and so on.

Fast response characteristics: it has a fast response capability and can react to the input signal in a short time. Generally speaking, its response time can reach a few milliseconds to tens of milliseconds, which is very important for the need for rapid action of the hydraulic system, such as high-speed stamping equipment, rapid injection moulding equipment. Fast response can improve the productivity of the equipment and reduce the production cycle.

High reliability and stability: Adopting industrial-grade design and high-quality electronic components and hydraulic parts, it can work stably for a long time under the harsh industrial environment. Its shell has good protection performance, such as IP65 or higher protection level, which can be dustproof and waterproof. The internal circuits and hydraulic system have been strictly tested and optimised, with anti-electromagnetic interference ability and anti-oil contamination ability, to ensure the reliability of the system.

Flexible Parameter Configuration and Adaptability: Parameters can be configured through software or hardware to adapt to different hydraulic systems and control requirements. For example, users can set parameters such as control gain, integration time, differential time to adjust the control performance, and can also set different working modes (such as position control mode, speed control mode, force control mode), so that it can be applied to the hydraulic control of various industrial equipment.

Technical Parameters

Input parameters:

Control signal type and range: accepts as control inputs analogue voltage signals (e.g. - 10V - + 10V) or analogue current signals (e.g. 4 - 20mA) that correspond to the desired hydraulic actuator motion parameters (position, speed or force).

Command Update Frequency: Capable of receiving higher frequency control command updates up to several kilohertz (e.g. 1 - 5kHz) to meet rapidly changing control requirements.

Output parameters:

Hydraulic Fluid Flow Control Range: Depending on the design of the hydraulic system and the specifications of the proportional solenoid valve, the hydraulic fluid flow control range can be from a few litres per minute (e.g. 0.1L/min - 10L/min) to a higher flow rate, depending on the application requirements.

Hydraulic oil pressure control range: the pressure control range can be from 0MPa - 30MPa or even higher, to meet the different pressure levels of the hydraulic system control requirements.

Performance parameters:

Position control accuracy: under ideal conditions, the position control accuracy can reach ±0.01mm - ±0.1mm, the specific accuracy depends on the sensor accuracy, hydraulic system stability and control algorithms and other factors.

Velocity control accuracy: Velocity control accuracy can reach ±1% - ±5% of the set speed, to ensure that the hydraulic actuator can move according to the expected speed.

Response time: For step input signals, the response time is generally between 5ms - 50ms, depending on the load characteristics of the system and the characteristics of the hydraulic fluid.