Proximity Switch PM AN270321 001 for Putzmeister Concrete Pump Truck Accessories

Product Description/Features:
Proximity switch is a position switch that can be operated without mechanical direct contact with moving parts. When the object is close to the sensing surface of the switch to the operating distance, no mechanical contact and pressure can be applied to make the switch operate, thereby driving the DC electrical appliance or providing control instructions to the computer (plc) device. Proximity switch is a switch type sensor (that is, contactless switch), it has the characteristics of stroke switch and micro-switch, and has sensing performance, and reliable action, stable performance, fast frequency response, long application life, strong anti-interference ability, and waterproof, shockproof, corrosion resistance and other characteristics. Products are inductive, capacitive, Hall, AC, DC type.

Proximity switch, also known as contactless proximity switch, is an ideal electronic switching sensor. When the metal detector is close to the sensing area of the switch, the switch can be non-contact, no pressure, no spark, quickly issue electrical instructions, accurately reflect the position and stroke of the moving mechanism, even for general stroke control, its positioning accuracy, operating frequency, service life, convenience of installation and adjustment and the ability to apply to harsh environments. Is the general mechanical travel switch can not be compared. It is widely used in machine tools, metallurgy, chemical industry, textile and printing industries. In the automatic control system can be used as limit, counting, positioning control and automatic protection link.

Among all kinds of switches, there is a component that has the ability to "sense" the object close to it - the displacement sensor. Using the sensitive characteristics of the displacement sensor to the approaching object to control the switch on or off, this is the proximity switch.

When an object moves toward the proximity switch and is close to a certain distance, the displacement sensor has "perception" and the switch will act. This distance is usually called the "detection distance". But different proximity switches have different detection distances.

Sometimes the detected objects move toward the approach switch one by one and leave one by one at a certain time interval, so that they are repeated constantly. Different proximity switches have different response ability to detected objects. This response characteristic is called the "response frequency".

Because displacement sensors can be made according to different principles and different methods, and different displacement sensors have different "perception" methods of objects, there are the following common proximity switches:

Passive proximity switch
This switch does not require a power supply, and the closed state of the switch is controlled by magnetic induction. When the magnetic or iron trigger is near the switching magnetic field, the magnetic force inside the switch controls the closure. Features: No power required, non-contact, maintenance-free, environmental protection.

Vortex access switch
This switch is sometimes called inductive proximity switch. It uses a conductive object to generate eddy currents inside the object when it approaches the proximity switch, which can generate an electromagnetic field. This eddy current reacts to the proximity switch, changes the internal circuit parameters of the switch, thereby identifying whether there is a conductive object moving closer, and then controls the switch on or off. The object that the proximity switch can detect must be an electrical conductor.
1. Principle: An oscillator composed of inductors and capacitors and transistors, and generate an alternating magnetic field, when a metal object is close to the magnetic field, it will produce eddy currents in the metal body, resulting in the oscillation to stop, and this change is amplified by the rear pole and converted into a transistor switching signal output.
2. Features: A, good anti-interference performance, high switching frequency, greater than 200 Hz B, can only sense metal.
3. Used in various mechanical equipment to do position detection, counting signal picking, etc.

Capacitive proximity switch
The measurement of this switch is usually one plate that constitutes the capacitor, and the other plate is the housing of the switch. This housing is usually grounded or connected to the housing of the device during measurement. When an object moves toward the approach switch, regardless of whether it is a conductor, due to its proximity, the dielectric constant of the capacitor must change, so that the capacitance changes, so that the state of the circuit connected to the measuring head also changes, and the switch can be controlled to be switched on or off. The objects detected by this proximity switch are not limited to conductors, liquids or powders that can be insulated.

Hall proximity switch
Hall element is a magnetically sensitive element. A switch made of Hall elements is called a Hall switch. When the magnetic object moves close to the Hall switch, the Hall element on the detection surface of the switch changes the internal circuit state of the switch due to the Hall effect, which identifies the presence of a magnetic object nearby, and then controls the on or off of the switch. The detection object of this proximity switch must be a magnetic object.

Photoelectric proximity switch
The switch made by photoelectric effect is called photoelectric switch. The light-emitting device and the photoelectric device are installed in the same detection head in a certain direction. When a reflective surface (detected object) approaches, the photoelectric device receives the reflected light and outputs it in the signal, thus it can "sense" that an object is approaching.

Other types
When the observer or system changes the distance to the source, the frequency of the approaching wave will shift, which is called the Doppler effect. Sonar and radar are built on the principle of this effect. Ultrasonic proximity switches and microwave proximity switches can be made by using Doppler effect. When an object moves closer, the reflected signal received by the proximity switch will produce Doppler frequency shift, which can identify whether there is an object approaching.

Main function
1. Check the distance
Detect the stop, start and pass position of elevators and lifting equipment; Detect the position of the vehicle to prevent the collision of two objects; Detect the set position of the working machine, the limit position of the moving machine or parts; Detect the stop position of the rotary body and the open or closed position of the valve.
2. Size control
Metal plate punching and cutting size control device; Automatic selection and identification of metal parts length; Detect the height of piles during automatic loading and unloading; Measure the length, width, height and volume of the item.
3. Detect whether the object exists
Check whether there are product packing boxes on the production packaging line; Check for product parts.
4. Speed and speed control
Control the speed of the conveyor belt; Control the speed of rotating machinery; Control speed and revolutions with various pulse generators.
5. Count and control
Detect the number of products flowing through the production line; Measurement of the number of revolutions of the high-speed rotating shaft or disk; Parts count.
6. Detect the exception
Check the bottle cap; Product qualified and unqualified judgment; Detect the lack of metal products in the packaging box; Distinguish between metal and non-metal parts; Product no label testing; Crane danger area alarm; Escalator starts and stops automatically.
7. Measurement control
Automatic metering of products or parts; Measuring the pointer range of a meter or instrument to control the number or flow; Detection buoy control surface height, flow; Detecting iron floats in stainless steel drums; Control of the upper or lower range of the instrument; Flow control, horizontal control.
8. Identify objects
Identify yes and no according to the code on the carrier.
9. Information transfer
ASI (Bus) connects sensors at various locations on the device to transmit data back and forth in the production line (50-100 meters).

ABOUT COMPANY:

Our company is committed to one-stop parts service to ensure perfect fit and excellent performance. This makes it easier for you to find the right part for your pump truck, saving you time and effort.

Changsha Huayi Technology Co., Ltd. is located in Changsha, Hunan Province, China, the beautiful capital of construction machinery. We have been specialized in construction machinery for more than 15 years, mainly specializing in concrete pumps and parts of construction machinery equipment, including Sany Heavy Industry, Zoomlion, Putzmeister, Xugong and other well-known brands.
Our company mainly engaged in Sany heavy industry pump parts, Zoomlion pump parts, used mechanical equipment, excavators, cranes, wet spray machine and other accessories, such as remote control, Rexrow oil pump, conveyor box, double concrete pump pipe, lubrication pump, Harvey/Eaton/Parker/Kawasaki /SUN valve well-known brand hydraulic valves.
Our technical backbone has been engaged in the construction machinery industry for 15 years. The company has strong technical service experience, support OEM/ODM services, and strive to provide overseas customers with a one-stop procurement and service platform.
We have been adhering to the faith of integrity to provide our customers with quality products and excellent service, the company has been committed to the concept of technology and service innovation, welcome to work with Huayi, win-win cooperation, and Tonghang hand in hand to create a better future.
Warmly welcome the majority of international friends to Changsha Huayi Technology to discuss cooperation, a cooperation, a lifetime of friends