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Heavy Duty Checkweighers
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Weigh Station ConfigurationsThompson Scale offers a wide variety of weigh station conveyor configurations to meet your unique production line requirements. We are the only manufacturer that offers a number of these configurations. Click on the conveyor style of interest to learn more about the configuration:
These unique configurations have been developed to meet the special needs of customers with little or "No" room for a checkweigher, but still require some type of quality control for their production packaging line. Conveyors for Up-right or Open-mouth bags This option is offered in response to the use of a Net Weigh Scale to fill open-mouth bags. To meet the requirements for this application, Thompson Scale developed a special weigh station conveyor starting at 28" long by 12" wide. This conveyor also contains a set of fully adjustable bag guides to stabilize the bag as it transfers across the checkweigher. This option allows the customer to verify each bag weight before sealing. This option uses a 28" long by 12" wide conveyor. Special small diameter transition rollers are mounted into the ends of the conveyor frame to provide smooth transition of rigid pails or kegs onto and off of the weigh station conveyor. Pails or kegs crossing from one conveyor to another may have a tendency to tip or rock as they move across a wide gap, which causes unstable readings at the checkweigher. The small roller eliminates this problem. Special side push rejectors specifically designed for pails and kegs are also offered by Thompson Scale. Incline/Decline Weighstation Conveyors Most scale applications require the scale base/load cell to be completely level to insure accurate weights. For special applications, Thompson Scale has modified the weigh station conveyor allowing for up to +/- 12 degrees of incline. The scale base remains level, but the framework that attaches the weigh station conveyor to the scale is built to place the conveyor at an angle. This is sometimes required for applications feeding an elevator/flattener conveyor or a conveyor line without any level sections of conveyor. Typically open-mouth bagging lines require adjustment of the conveyors to accommodate the sealer conveyor that closes the bag. The sealer is usually fixed, so the surrounding conveyors must move to allow a variety of different bag sizes to pass through the system. The model 4693 HL Checkweigher 's hydrualically adjustable support stand can be automatically adjusted to the desired height at the push of a button. Its legs can be easily extended or retracted by an overall twelve inches to match surrounding conveyors. Many valve type bagging applications (air packer, auger or impeller packer) discharge filled bags onto a take-away conveyor, placing the bags on their sides. The bags then travel to the end of this conveyor and then drop about one foot onto another conveyor running perpendicular to the take-away conveyor. This allows the bag to travel head-first down the remainder of the conveyor system. In some applications, the only place to install a checkweigher is between the end of the take-away conveyor and the transfer conveyor. Thompson Scale offers a special width conveyor that allows the bag to actually fall off the end of the checkweigher to complete the weighment. Another unique application of the Thompson Model 4693 checkweigher is on a power curve conveyor. Many packaging lines require a turn within the conveyor system between the packaging machinery and the palletizing station. If there is no other place for a checkweigher, Thompson Scale can utilize either a new or existing power curve conveyor (45 or 90 degree), placing a scale beneath the curve conveyor. The only restriction of this application is production rate. Most power curve conveyors work out to be about 5'0" long, so bags must be farther apart to allow one bag on the conveyor at a time. Thompson Scale's applications engineers can help you specify speed and rate for these applications. Space-Saver Checkweigher & Rejector in One 4'0" Conveyor Length A common problem encountered on existing production lines is the lack of room for both a checkweigher and reject station (both taking about 4' each). For a number of applications, the Thompson Space-Saver Checkweigher/Reject station may be the only viable solution. This unique configuration takes a little more than 4' to weigh and reject a bag. The side pusher rejector is extremely fast acting, allowing the bag ample time to get weighed but still fully rejecting any off-spec bag. Maximum production rate on this system is about 8 units per minute. |
