Level measurement with MBA700 in recycling bulk material
Level measurement technology plays an important role in bulk materials handling. The challenge to the corresponding devices, including the system requirements, can be illustrated well using recycling processes. The medium-sized company Arbeitsgemeinschaft PVC-Bodenbelag Recycling (AgPR) requires smoothly working bulk level measurements as a basis for safety and reliability in the entire recycling procedure. The company achieved this with the vibrating single-rod technology of the MBA700 as limit switch, a measuring instrument MBA Instruments GmbH from Quickborn, Germany.
Old turns into new
Reprocessing at the AgPR focuses on used PVC floorings that are processed in different work steps to produce recycled material. "They then serve as a basis for the production of PVC floorings,"Heinz-Ahlerich Lübben, works manager of the AgPR, describes the entire recycling process, adding: "The challenge is in filtering out the foreign substances from the chopped material."
Discontinuous processes
The AgPR needs a reliable instrument when recycling old PVC-floorings. "After shredding old floorings, a dosage container fills the resulting bulk goods into a cooling screw,"Lübben reports. "This process is discontinuous, which is why we depend on sensitive fill level sensors." Before the change to the vibration limit switch MBA 700, the fill level was monitored with a rotor indicator. This measuring procedure is characterised by a motor continually turning a blade via a shaft. Once the charge touches the measuring blade and impairs its rotation, the measuring device emits a signal that interrupts filling. The disadvantage of this concept: In particularly fine and light-weight charges, the blade must be sized accordingly so that the switch will be triggered fast enough. When use of a large wing is not possible due to the system setup, there may be incorrect reports because the fine substances will stop blade rotation too late. AgPR was facing this problem as well. The choice thus fell on the single-rod vibration switch MBA 700.
(click on picture to enlarge)
The vibrating single-rod technology
of the MBA700
Sensitive and reliable
As compared to other vibration rods, the patented limit switch MBA700 is a true, vibrating single rod. While vibration fork and false vibration rods have been competitors for a longer period of time, the sword-shaped sensor, also known as a vibration blade or vibrating paddle, is unique to date.
It vibrates with a low energy at 290 Hz, so that it will not "dig itself free" on its own; incorrect measurements by cavity formation is thus avoided. Instead, the MBA700 uses the vibration blade procedure to find even extremely light-weight materials with a bulk weight of up to 10 grams per litre.
The vibration fork was used as a basis for the development of the single rod vibration fork. It was modified and improved time and time again until a single solid, vibrating stainless steel rod was developed. For best measuring-technical safety, the rod was given a cross-section shaped like a flattened diamond that led to a unique sword shape. This prevents adherence of powder when the device is installed in the direction of the material flow. The desired properties are achieved: High sensitivity to detect very light-weight powders and at the same time best mechanical stability to be used in heavy or viscous bulk goods. If the vibrating blade is bent by mechanical effects after all, it still continues to vibrate.
The measuring procedure is based on making a rod of steel swing with a piezo element. Vibration is a better term here, since swinging happens at a high frequency. If the vibrating element comes into contact with a liquid or solid substance, the vibration is dampened. The electronics recognise this, switch off the vibration and sends a signal.
No problem with the system integration
Since the measuring procedure was integrated into the recycling process of the AgPR subsequently, the challenge was in integrating the device signal into the programmable logic controller (PLC) of the unit. "This serves to inspect the process control via our digital system,"Lübbel explains. "There was no problem here regarding implementation of the MBA 700. The unit now has two devices that react reliably and quickly and warrant secure switching."
SMB-Group
SMB International and MBA Instruments: Two brands - one idea. SMB and MBA have focused their Business activities in the area of "material handling". Planning, development, manufacturing, global distribution service of highly complex, automatic loading systems, filling systems, level measurement technology, palletizers, conveyor systems, compact high-bay warehouse ship loaders are part of our product range Quite consciously, the SMB Group has opted for a high proportion of in-house production at its plant in Quickborn, near Hamburg, Germany. In this way, customer requirements are spontaneously and targeted implemented quickly using a consistently high quality. House design and production of mechanical and electrical components are the basis for the decision to high production depth, guaranteeing the reliability in terms of quality and delivery time. Installation and service teams work on national and international projects. The global sales network ensures quick and targeted information and coordination
Level Measurement with the MBA700
Application example: Dosing of PVC granulate
Level measurement with MBA700 in recycling bulk material
Level measurement technology plays an important role in bulk materials handling. The challenge to the corresponding devices, including the system requirements, can be illustrated well using recycling processes. The medium-sized company Arbeitsgemeinschaft PVC-Bodenbelag Recycling (AgPR) requires smoothly working bulk level measurements as a basis for safety and reliability in the entire recycling procedure. The company achieved this with the vibrating single-rod technology of the MBA700 as limit switch, a measuring instrument MBA Instruments GmbH from Quickborn, Germany.
Old turns into new
Reprocessing at the AgPR focuses on used PVC floorings that are processed in different work steps to produce recycled material. "They then serve as a basis for the production of PVC floorings," Heinz-Ahlerich Lübben, works manager of the AgPR, describes the entire recycling process, adding: "The challenge is in filtering out the foreign substances from the chopped material."
Discontinuous processes
The AgPR needs a reliable instrument when recycling old PVC-floorings. "After shredding old floorings, a dosage container fills the resulting bulk goods into a cooling screw," Lübben reports. "This process is discontinuous, which is why we depend on sensitive fill level sensors." Before the change to the vibration limit switch MBA 700, the fill level was monitored with a rotor indicator. This measuring procedure is characterised by a motor continually turning a blade via a shaft. Once the charge touches the measuring blade and impairs its rotation, the measuring device emits a signal that interrupts filling. The disadvantage of this concept: In particularly fine and light-weight charges, the blade must be sized accordingly so that the switch will be triggered fast enough. When use of a large wing is not possible due to the system setup, there may be incorrect reports because the fine substances will stop blade rotation too late. AgPR was facing this problem as well. The choice thus fell on the single-rod vibration switch MBA 700.
(click on picture to enlarge)
The vibrating single-rod technology
of the MBA700
Sensitive and reliable
As compared to other vibration rods, the patented limit switch MBA700 is a true, vibrating single rod. While vibration fork and false vibration rods have been competitors for a longer period of time, the sword-shaped sensor, also known as a vibration blade or vibrating paddle, is unique to date.
It vibrates with a low energy at 290 Hz, so that it will not "dig itself free" on its own; incorrect measurements by cavity formation is thus avoided. Instead, the MBA700 uses the vibration blade procedure to find even extremely light-weight materials with a bulk weight of up to 10 grams per litre.
The vibration fork was used as a basis for the development of the single rod vibration fork. It was modified and improved time and time again until a single solid, vibrating stainless steel rod was developed. For best measuring-technical safety, the rod was given a cross-section shaped like a flattened diamond that led to a unique sword shape. This prevents adherence of powder when the device is installed in the direction of the material flow. The desired properties are achieved: High sensitivity to detect very light-weight powders and at the same time best mechanical stability to be used in heavy or viscous bulk goods. If the vibrating blade is bent by mechanical effects after all, it still continues to vibrate.
The measuring procedure is based on making a rod of steel swing with a piezo element. Vibration is a better term here, since swinging happens at a high frequency. If the vibrating element comes into contact with a liquid or solid substance, the vibration is dampened. The electronics recognise this, switch off the vibration and sends a signal.
No problem with the system integration
Since the measuring procedure was integrated into the recycling process of the AgPR subsequently, the challenge was in integrating the device signal into the programmable logic controller (PLC) of the unit. "This serves to inspect the process control via our digital system," Lübbel explains. "There was no problem here regarding implementation of the MBA 700. The unit now has two devices that react reliably and quickly and warrant secure switching."
SMB-Group
SMB International and MBA Instruments: Two brands - one idea. SMB and MBA have focused their Business activities in the area of "material handling". Planning, development, manufacturing, global distribution service of highly complex, automatic loading systems, filling systems, level measurement technology, palletizers, conveyor systems, compact high-bay warehouse ship loaders are part of our product range Quite consciously, the SMB Group has opted for a high proportion of in-house production at its plant in Quickborn, near Hamburg, Germany. In this way, customer requirements are spontaneously and targeted implemented quickly using a consistently high quality. House design and production of mechanical and electrical components are the basis for the decision to high production depth, guaranteeing the reliability in terms of quality and delivery time. Installation and service teams work on national and international projects. The global sales network ensures quick and targeted information and coordination
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