The key to J&H Vibrating Wire Cloth Screen machines is the high frequency, low amplitude vibration of the wire cloth. The vibration is generated by J&H Vibrating Drive motors mounted on isolated motor mounts. This is done at the center of the wire cloth where most of the material is located, not on the sides of the wire cloth. The vibration is not to convey the material, as this is accomplished by the inclined angle of the screen and the momentum of the particles. The vibration is to differentiate the particle sizes and improve the efficiency of the screening process in the short amount of time that the material is sliding along the screen surface. For the size particles that are used for most granular products, the small amplitude and high frequency is the most effective.
But why vibrate the wire cloth from the middle of the screen? If you think about the wire cloth like you would the material stretched tight across the top of a drum, you might get a better picture. The sound made by a drum is simply the beautiful, harmonic vibration of this material. If you want to make a good sound, you don’t strike the drum on the side, you strike the cloth right near the middle of the drum. The quality of the sound is an indication of the entire area of the drum head vibrating in unison. Striking near the edge of the drumhead produces a higher, less resonant sound because not all of the cloth will be vibrating the same.
In order to get the wire cloth in our screen machines to vibrate in this drumhead like harmonic mode, the J&H Mod III Vibrating Screens are built around our unique tuned suspension tensioning system. This exclusive system isolates vibration from the screen frame. The innovative and unique design of the J&H Screen that differentiates us from the others is the exclusive OPTIMIZER Tensioning system. This helps J&H screens achieve high screening efficiency and increase production while minimizing power consumption costs, structural loads, and maintenance requirements. For screens operating in adverse environmental conditions or with certain damp materials, a J&H Heat system and a J&H Speed Clean unit can help solve the problems of material sticking to the wire cloth.
J&H Mod III machines are offered in single deck, double deck, triple deck, and riffle configurations and in sizes from 4’x5’ (1.2 m x 1.5 m) to 7’x25’ (2.1 m x 7.6 m). The tensioning system and floating motor allow our screens to be rigidly mounted to the supporting structure and feed and discharge chutes.
Incorporating 37 years of laboratory and field work, it is designed to process 8 mm (2 mesh) to .152 mm (100 mesh) material at very high capacities and with extreme accuracy. Since we have been a leader in the industry for so long, the technology and design for our screens have evolved some. A J&H Conversion Kit can upgrade your screen to the latest operating model.
For final polishing process stage, J&H has the option for a J&H Vector Drive.
This combination of unique features offers unparalleled screening efficiency, productivity, and durability.
- J&H’s unique tuned suspension system, which yields better uniformity and distribution of vibration throughout the screening surface
- Enlarged inlet and oversize openings that reduce the chance of plugging
- Riffle feed, which enables our machines to double the screening area without increasing the floor space required
- 1800 (1500) and 3600 (3000) rotary vibrators mounted on rubber buffers to give quiet, soft control of the vibration and to minimize structural vibration
- Increased opening between multiple-deck machines, which facilitates inspection and wire cloth changes
- Accessible rollback rubber covers–the first in the industry
- Motor repair kit that allows the end user to rebuild old vibrators to new standards–quickly and economically
- Conversion systems in kit form to update older machines to the latest technology