Line contact weighing device

Abstract

A line contact weighing device includes a weighing slide way. The weighing slide way is a smooth-groove-shaped structure having two end openings along the movement direction of a to-be-weighed object and having a U-shaped cross section. The smooth-groove-shaped structure is formed by bending a plate and includes a left vertical plate disposed at the left side of the weighing slide way, a right vertical plate disposed at the right side of the weighing slide way and a slide way bottom plate connecting the right vertical plate with the left vertical plate. The joint of the left vertical plate and the slide way bottom plate is corresponding to a left downward bending line. The device is characterized by also comprising a right bending plate disposed on the right vertical plate; the joint of the right being plate and the right vertical plate is corresponding to a right upward bending line; all the bending lines are along the movement direction of the to-be-weighed object and are parallel to each other; the lower left part of the to-be-weighed object is in contact with either upper surface of the slide way bottom plate on the left inner side of the weighing slide way or the inner arc corresponding to the left downward bending line, or in contact with both of the upper surface of the slide way bottom plate on the left inner side of the weighing slide way and the inner arc corresponding to the left downward bending line. The to-be-weight object is weighed when sliding on the weighing slide way in a manner of leaning against the weighing slide way, the left side being low while the right side being high.

Description

technical field [0001] The method invention relates to the field of automatic weighing, in particular to a weight detection scale and weight classification using a slide scale. Background technique [0002] In the production or packaging process of food, medicine, daily chemical products, etc., it is necessary to spray code the weight of the item, or check the weight of the item according to the production standard and measurement regulations and select the overweight and ultra-light products, and The need to classify according to the weight of the items, such as agriculture, forestry, aquatic products and poultry products; these processes require weight detection scales and weight grading scales. [0003] The weight detection scale and weight grading scale that use the slide plate as the dynamic weighing platform are called slide plate scales. Skateboard scales include a control box, a bracket, and a load cell fixed on the bracket. The load-bearing end of the load cell is ...

AI Technical Summary

Problems solved by technology

The function of the two sides of the slideway is only used to restrict the object from sliding out of the weighing platform, not to regulate the slideway trajectory of the object, because once the object touches the side elevation of the weighing platform during sliding, it will affect the linear running speed and weighing accuracy

For V-shaped cross-section grooves, the object may swing left and right in the obtuse-angled V groove and slide in an S-shape, or it may be in surface contact with at least one side of the V groove, especially for six-sided box-shaped objects, sliding can easily become at least an object One surface of the V groove is in contact with one surface of the V groove, and the weighing result is greatly affected by the flatness of the surface, while the acute angle V groove seriously affects the sliding length of the object; some objects to be weighed may be distributed on both sides of the V groove. Each of these two lines is in contact with each other, and these two lines must bear the full weight of the object, but because the straightness of these two lines is not high enough, the impact on the load cell is very large when the object slides over, and the weighing accuracy is still not high

[0005]In short, in the existing dynamic skateboard weighing, although the objects lie on the skateboard and slide face to face, since the movement posture of the object is not restricted on both sides of the slideway, the object During the sliding process, it often occurs: 1. The bottom surface of the object is in surface contact with the upper bottom surface of the slideway. The roughness and humidity of each point on the contact surface are different, resulting in inconsistent friction, and the landing point and angle posture of the object are different every time the object is on the weighing platform. , it often appears to spin or curve on the slideway; the object does not slide in a straight line at a constant speed. For objects with loose flowing contents, some of the contents move in the packaging bag box due to rotation or swing during sliding, resulting in this part of the content Weight loss or aggravation seriously interferes with the results of the load cell

2. The object does not slide in a straight line at a constant speed, which also leads to inconsistent sampling and processing of the weighing data by the control box of the checkweigher, which affects the weighing result

3. There is an error in the flatness of the slideway, and the flatness error of the bottom surface of the object is often larger. The uneven bottom surface of the object and the uneven upper surface of the skateboard slide and collide with each other, resulting in impact interference on the slideway, that is, the load cell. Big; 3. Therefore, when different objects of the same weight or even the same object slide over the weighing platform every time, due to the disordered running posture of the object and the uneven impact of the bottom surface of the object and the contact surface of the slideway, the effect and impact on the load cell will be uneven. Not the same, this kind of impact interference is difficult to eliminate by analog control technology or digital processing or calibration technology, which seriously affects the weighing accuracy

[0010] But these efforts were either costly or difficult to control, and none of them significantly improved the weighing accuracy of the slide scales

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