Type of checkweigher rejection device

Since the products that pass the checkweigher machine are diverse, and different products require different forms of rejection devices, there are many types of rejection devices. The most common ones are introduced below: air spray type, push rod type, Swing arm type, conveyor lifting type, conveyor falling type, split and parallel type, belt conveyor stop/alarm system. Air jet checkweigher reject device The air jet reject device uses 0.2MPa~0.6MPa compressed air as the air source and is controlled by a solenoid valve. Once triggered, the compressed air is blown out directly through the high-pressure nozzle, and the resulting high-speed airflow causes the products to leave the conveyor belt and be rejected. Simple air injection is usually the best solution. It can be used for light-packaged products with a dead weight of less than 500g. Rejection of individually packaged small and lightweight products conveyed on a narrow conveyor system, and allows a short distance between products, so it can be used for high-speed rejection occasions with a maximum throughput of 600 pieces/min. Sometimes there is one air jet nozzle, but in order to get a better blowing effect, multiple nozzles arranged horizontally or vertically arranged up and down can also be used. For example, the use of two horizontally arranged combined nozzles is suitable for product packaging with a larger width, so that it will not rotate during the rejection process; while the use of two vertically arranged combined nozzles is suitable for high-height product packaging. A successful air jet rejection device needs to consider the instantaneous air velocity at the nozzle outlet, the packaging density of the product, the distribution of the material in the packaging, the position of the nozzle and its combination. Push rod type checkweigher machine reject device Push rod type reject device uses 0.4MPa~0.8MPa compressed air as the air source of the cylinder, and the push rod on the piston shaft of the cylinder is equipped with a rectangular or circular baffle. When the cylinder is driven by compressed air At this time, the baffle will reject the product on the conveyor. The push rod rejection device can be used in various occasions with a wide range of product packaging size and weight, such as 0.5kg-20kg products. However, because the forward and backward of the push rod takes time, its rejection speed is slower than that of the air-jet type, and it is usually used in situations where the throughput is 40 pieces/minute to 200 pieces/minute. The push rod rejection device can also adopt an electric method, which has high energy efficiency, low noise and low vibration. Swing arm type checkweigher reject device The swing arm has a fixed pivot, so that the swing arm can be switched in two directions, right or left, so as to guide the product to the left or right. It can be pneumatic or electric. Although the swing arms can switch quickly and can cope with high throughput, their movements are usually softer and are suitable for boxed products or thicker bags. When a gate with a pivot is installed on the side of the conveyor, it is usually called a scraper, which can rotate a certain angle along the conveyor belt to reject the product into the collection box. The scraper removal method is suitable for dispersing, random, and non-directional medium weight products on conveyor belts whose width is usually no more than 350mm. Conveyor lifting checkweigher rejection device A conveyor close to the output section can be designed as a lifting conveyor, so that when products need to be rejected, the end close to the output section can be lifted. When this end of the conveyor is lifted up, the product can fall into the collection box from this. At this time, the lifting conveyor is equivalent to a door, which is suitable for occasions where it is difficult to remove products directly from the running direction. Due to the limited lifting height and the fixed time required for resetting, this rejection method is limited by product height and throughput. Conveyor drop checkweigher rejection device A conveyor close to the output section can also be designed as a drop conveyor, that is, when products need to be rejected, the end away from the output section is designed to fall. When the distal end of this conveyor falls, the product can slide down with the inclined downward conveyor, and then fall into the collection box. Like the lifting conveyor, the falling conveyor is also equivalent to a gate, which is suitable for occasions where it is difficult to remove products directly from the running direction. Due to the limited falling space and the time required for resetting, this rejection method is also limited by the height and throughput of the product. Split-line parallel checkweigher reject device The split-line parallel reject device can divert products to two or more channels for rejecting, sorting, and diverting products. As a rejection device, they can be used for unstable and unpackaged products such as open bottles, open cans, trays for meat and poultry, and can also be used for large cartons, with a gentle removal process. There is a row of plastic plates on the rejection device. Under the control of the PLC controller, the plastic plates are driven by the rodless cylinder to move left and right, and the packaged products can be brought into the appropriate passage. Without imposing impact on the rejected products, the flow is split on the same plane. Since the product will not be damaged when it is rejected, it is suitable for replacement and reuse of the product. Stop belt conveyor/alarm system reject device Product inspection system can be designed to issue an alarm and stop the belt conveyor when it detects a weight problem. Before restarting the inspection equipment, the machine operator will be responsible for removing the product from the production line. This rejection system is suitable for slow or small throughput production lines and large and heavy products that are not suitable for automatic rejection mechanisms. The above is the relevant content about the type of checkweigher rejection device shared for you today, I hope it will be of some help to you.
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