CN210346882U - Slide plate check weighing scale - Google Patents
Slide plate check weighing scale Download PDFInfo
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- CN210346882U CN210346882U CN201921658274.4U CN201921658274U CN210346882U CN 210346882 U CN210346882 U CN 210346882U CN 201921658274 U CN201921658274 U CN 201921658274U CN 210346882 U CN210346882 U CN 210346882U
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Abstract
A slide checkweigher comprises a weight conduction piece, a weighing sensor, a belt conveying device and a control device, wherein the top of the weight conduction piece is provided with a smooth sliding contact surface, the sliding contact surface is a plane and is vertical to the bearing direction of the weighing sensor, the weight conduction piece is rigidly connected with the bearing end of the weighing sensor, the belt conveying device runs along the material conveying direction and comprises at least one belt, the left and right sides on belt conveyor upper portion respectively have a roller, are left roller and right roller respectively, and the belt passes through on left roller and right roller, and the part that the belt is located between the last summit of left roller and the last summit of right roller is called the epaxial belt, and weight conduction spare is located between left roller and the right roller, and sliding contact surface and the epaxial partial lower surface sliding contact who goes up the belt, BC are greater than WC, and the axis of left roller and right roller is parallel to each other and all is parallel with sliding contact surface.
Description
Technical Field
This scheme relates to slide checkweigher field, especially relates to the slide checkweigher that adopts the weight conduction piece level of the soft belt support animal body to arrange or small-angle slope arranges.
Background
Many articles, such as various boxed, bottled or bagged medicines or foods, various irregularly shaped indigenous or aquatic products or industrial products, need to be checked for their qualified or missing or multiple articles or classified according to their weights by a checkweigher on a production line.
The slide plate checkweigher with the large-angle inclined downward upper surface of the weight transfer piece is already widely applied to production lines due to high precision.
The slide checkweigher comprises a base, a material arranging slide plate, a weight conduction piece and an electric control cabinet. The weighed object slides from the upper surface of the weight conduction piece and is weighed simultaneously, the weight conduction piece is rigidly connected with the bearing end of the weighing sensor below the weight conduction piece, the fixed end of the weighing sensor is rigidly connected with the base, and the weighing sensor is electrically connected with the electric control cabinet. The upper surface of the weight conduction piece is very smooth, so that the frictional resistance of the object sliding can be reduced, the upper surface of the weight conduction piece is also very flat, the jumping and bumping, the horizontal rotation and the vertical rolling of the object sliding can be reduced, the influence of the friction force on the weighing result is eliminated vertically to the bearing direction of the weight conduction piece and the weighing sensor, and the higher weighing precision can be achieved. The weight-transmitting element is usually produced from a thin steel sheet.
The slide plate checkweigher with the upper surface inclined downwards at a large angle is arranged on the weight conduction piece, and objects slide on the weight conduction piece and are weighed according to the initial speed and the height potential energy. Because the interference of the symmetrical weight sensor of the rotating component is avoided, the weighing sensor is free from other interference and contact restriction except the object on the sliding plate, the length of the weight conduction piece along the advancing direction of the object can be designed to be very long so as to greatly increase the weighing time, and therefore, the weighing precision of the sliding plate scale is very high. Because weight conduction spare quality is very light, both can choose for use the less weighing sensor of range in order to improve the precision of weighing, simultaneously, weight conduction spare and the direct rigid fixation of weighing sensor still ensure that weight conduction spare and the elastic system's that weighing sensor constitutes natural frequency is very high, and the conduction reaction to weight is extremely fast. Therefore, the slide plate checkweigher not only has higher precision than that of a belt checkweigher, but also can adapt to high-speed weighing. Therefore, the slide plate checkweigher with the upper surface inclined downwards at a large angle is widely applied to production lines.
However, the slide checkweigher has the following disadvantages:
1. it is required that the bottom surface of the object to be weighed is also very smooth, that the friction with the upper surface of the weight transmitter is very small, and that the surface of the object to be weighed is especially dry and non-sticky.
2. The bottom surface of the object to be weighed is required to be as flat as possible, otherwise, the object may rotate or turn due to friction or resistance with the sliding plate, and weighing accuracy is seriously affected.
3. The gravity center of the object to be weighed is required to be lower; the weight of the opened liquid container is not suitable for check weighing, because the inclined downward weight conduction piece can cause the opened liquid container to spill liquid, and the horizontally arranged weight conduction piece can slow down due to the resistance of the bottom of the object, and the top of the object can tilt forward to spill liquid; similarly, a closed container is not suitable because the liquid is shaken inside the container, which results in inaccurate weighing.
4. It must be tilted by more than 20 deg..
When the inclined downward angle of the upper surface of the weight conduction piece is less than 15 degrees for various packaging products such as common paper boxes, plastic bags and the like, the sliding component force of the weight of the object to be weighed relative to the surface of the sliding plate becomes small, the sliding friction force becomes large, the sliding posture and the speed of the object become unstable, and the stable high-precision weighing cannot be realized. When the upper surface of the weight conduction piece is horizontally arranged or arranged at a small inclination angle smaller than 15 degrees, a low-speed object cannot slide through the weight conduction piece, the length of the weight conduction piece is required to be short, and only a medium-high speed object with a very smooth bottom is allowed to slide through the weight conduction piece in an inertia mode. However, in the sliding process of the medium-high speed object, the friction force between each point at the bottom of the object and the sliding plate is inconsistent in each sliding process, so that the sliding posture of each sliding process is changed, the sliding speed is slowed down, the sliding speed of the same object on the sliding plate in the same initial speed and the same posture is different, particularly the speed of the same object when the same object slides out of the sliding plate is different, particularly the short length of the weight conduction piece causes the short bearing time of the weighing sensor and the small sampling of weight data, and the weighing data processing is seriously influenced, so that the weighing precision is influenced.
Therefore, slide checkweighers are not suitable for applications where the slides must be arranged horizontally or at small inclinations of less than 15 °.
In fact, however, many production lines are only capable of horizontal transport, and the scale platform of the checkweigher must be arranged horizontally or at a small inclination of less than 15 °.
5. The method is not suitable for a production line with strict requirements on the posture of the weighed object in the subsequent process, because the object can rotate or tumble in the sliding check weighing process in the prior art. For example, a lot of box-packed products need to be marked with a code at a specific position of the packing box after weight checking, the packing box can not rotate in posture when the weight checking is required, and for example, objects need to be packed in the box after the weight checking, and the posture of the objects can not be changed when the weight checking is required.
These disadvantages severely limit the wide use of slide checkweighers, particularly in manufacturing lines that transport objects horizontally.
SUMMERY OF THE UTILITY MODEL
This scheme provides a slide checkweigher.
The technical measures adopted by the application are as follows: a slide plate checkweigher comprises a weight conduction piece, a weighing sensor, a belt conveying device and a weight transmission piece, wherein the top of the weight conduction piece is provided with a smooth sliding contact surface, the sliding contact surface is a rectangular plane and is vertical to the bearing direction of the weighing sensor, the weight conduction piece is rigidly connected with the bearing end of the weighing sensor, the weight transmission piece also comprises a belt conveying device running along the material conveying direction, the belt conveying device comprises a belt, the left and the right sides of the upper part of the belt conveying device are respectively provided with a roller shaft which is a left roller shaft and a right roller shaft, the belt passes through the left roller shaft and the right roller shaft, the part of the belt positioned between the upper peak of the left roller shaft and the upper peak of the right roller shaft is called an inter-shaft upper belt, the weight conduction piece is positioned between the left roller shaft and the right roller shaft, the sliding contact surface is in sliding contact with the partial lower surface of the inter-shaft upper belt, the, BC is greater than WC, and the axes of the left and right roller shafts are parallel to each other and both parallel to the sliding contact surface.
The scheme is characterized in that the distance between the top point of the cross section of the left roll shaft and the leftmost contact point of the inter-shaft upper belt and the sliding contact surface is ZC, the load bearing end of a weighing sensor directly presses on the weighing sensor when the weighed object is not provided with the inter-shaft upper belt, the downward displacement of the load bearing end of the weighing sensor is h, and the length of ZC is ensured to be 57.3 multiplied by h, ZC and WC/2.
The distance between the rightmost contact point of the belt and the sliding contact surface between the shafts and the top point of the right roller shaft is YC, YC is guaranteed, and 57.3 xh is more than YC and less than WC/2.
The belt conveying device comprises two independent and parallel belts, and the top of the weight conduction piece is only provided with one sliding contact surface.
The weight transmitter has two mutually independent sliding contact surfaces of the same shape and size, the long side of each sliding contact surface is arranged along the running direction of the belt, and the height of the other part of the weight transmitter outside the two sliding contact surfaces is lower than the height of the two sliding contact surfaces.
The weight conduction piece is provided with two mutually independent sliding contact surfaces with the same shape and size, the long edge of each sliding contact surface is arranged along the running direction of the belt, and the height of the other parts of the weight conduction piece, which are positioned outside the two sliding contact surfaces, is lower than the height of the two sliding contact surfaces; the device also comprises two independent and parallel belts; the two belts are in sliding contact with the corresponding sliding contact surfaces respectively.
The top of the material smoothening sliding plate is a smooth plane, the top plane of the material smoothening sliding plate is coplanar or parallel to the sliding contact surface, the top plane of the material smoothening sliding plate is in sliding contact with the inter-shaft upper belt, the top plane of the material smoothening sliding plate is not lower than the sliding contact surface, the distance between the rightmost end point of the contact between the material smoothening sliding plate and the inter-shaft upper belt and the leftmost contact point of the inter-shaft upper belt and the sliding contact surface is SC, and the SC length meets the following condition that SC is more than 57.3 x h and less than WC/2.
A discharging sliding plate is further arranged between the weight conduction piece and the right roller shaft, the top of the discharging sliding plate is a smooth plane, the top plane of the discharging sliding plate is coplanar or parallel to the sliding contact surface, the top plane of the discharging sliding plate is in sliding contact with the upper belt between the shafts, the top plane of the discharging sliding plate is not higher than the sliding contact surface, the distance between the rightmost end point of the sliding contact surface in contact with the upper belt between the shafts and the leftmost contact point of the upper belt between the shafts and the discharging sliding plate is CC, and the length of CC is required to meet the following conditions that CC is more than 57.3 x h and less than WC/2.
A material smoothening sliding plate is further arranged between the left roller shaft and the sliding contact surface, the top of the material smoothening sliding plate is a smooth plane, the top plane of the material smoothening sliding plate is in sliding contact with the upper belt between the shafts, the distance between the rightmost end point of the material smoothening sliding plate in contact with the upper belt between the shafts and the leftmost contact point of the upper belt between the shafts and the sliding contact surface is SC, and the length of SC needs to meet the following condition that SC is more than 57.3 x h and less than WC/2;
the top plane of the material smoothening sliding plate inclines to the right upper side in a small range relative to the sliding contact surface, the mutual included angle A is smaller than 10 degrees, the running linear speed of the belt is V, g is the local gravity acceleration, the vertical distance from the leftmost contact point of the sliding contact surface and the upper belt between the shafts to the top plane of the material smoothening sliding plate is ZJ, and ZJ is larger than 0.5 Xg XSC/(V).
A discharging sliding plate is further arranged between the weight conduction piece and the right roller shaft, the top of the discharging sliding plate is a smooth plane, the top plane of the discharging sliding plate is in sliding contact with the upper belt between the shafts, the distance between the rightmost end point of the sliding contact surface in contact with the upper belt between the shafts and the leftmost contact point of the upper belt between the shafts and the discharging sliding plate is CC, and the length of CC is required to be ensured to be 57.3 Xh < CC < WC/2;
the top plane of the discharging sliding plate is slightly inclined towards the right lower side relative to the sliding contact surface, the mutual included angle B is smaller than 10 degrees, the vertical distance from the leftmost contact point of the discharging sliding plate and the upper belt between the shafts to the sliding contact surface is YJ, and YJ is larger than 0.5 Xg × CC × CC/(V × V).
The belt conveying device is of a multi-roller structure, a third roller shaft is further arranged below the plane where the left roller shaft and the right roller shaft are located, and a sufficient space is reserved between the belt and the third roller shaft between the shafts to install the weight transmission piece and the weighing sensor.
The weighing device comprises a base, a weighing sensor and an electric control cabinet, wherein the fixed end of the weighing sensor is rigidly connected with the base; belt conveyor only has two rollers of left roller and right roller total, and wherein left roller is the driven shaft, and right roller is the drive roll axle, and right roller is by motor drive, and weighing sensor alternates to set up between the belt of two parallels, and the base setting is outside two belts, weight conduction spare and weighing sensor fastening connection. The sliding contact surface is a rectangular plane.
The section of the weight conduction piece, which is vertical to the running direction of the belt, is of a concave structure, and two sides of the weight conduction piece are upwards provided with bulges; the upper surfaces of the two bulges are sliding contact surfaces; the width of the sliding contact surface is less than or equal to the width of a belt in sliding contact with the sliding contact surface, and the height of the upper surface of the middle part of the weight transmission piece is lower than that of the strip-shaped smooth planes on the two sides.
The concave structure of the weight conduction piece and the bulge thereof are formed by bending a whole plate, and the bending line is parallel to the running direction of the belt.
The section of the weight conduction piece, which is vertical to the running direction of the belt, is of a concave structure, and two sides of the weight conduction piece are upwards provided with bulges; the concave structure of the weight transmission piece comprises a concave frame made of light materials and a hard guide rail which is fixedly connected with bulges on two side surfaces of the concave frame and is provided with a smooth upper surface, the length direction of the hard guide rail is consistent with the running direction of a belt, and the upper surface of the hard guide rail is a sliding contact surface.
And a belt conveyor used for rejecting unqualified objects is connected behind the right roller shaft, two pneumatic nozzles are arranged on the belt conveyor for rejecting in an up-down overlapping mode, each air nozzle corresponds to one electromagnetic valve, and the two pneumatic nozzles point to the same direction and position.
This scheme has expanded the application range of current slide checkweigher by a wide margin, has improved the technological effect of current checkweigher by a wide margin, has produced following beneficial effect:
1. high-precision weighing is realized, and the precision of the slide plate checkweigher exceeds that of the existing slide plate checkweigher.
The belt is soft, after calibration, the influence of the initial tension of the belt and the component force of the belt tensile stress increment caused by the downward movement of the bearing end of the weighing sensor in the plumb direction on the weighing result of the weighed object is completely compensated, in addition, the belt power drives the weighed object to slide through the weight conduction piece, the length of the weight conduction piece along the moving direction of the object can be very long, the weighing sensor can sample more data, the weight conduction piece can slide through the weight conduction piece in a speed controllable manner, and the speed and the posture of the weighed object on the large-inclination-angle slide plate checkweigher are completely free and uncontrollable. Therefore, the weighing precision of the scheme of the application is very high and exceeds the weighing precision of the large-angle inclined sliding plate checkweigher.
2. The weighing scale can be used for weighing at ultra-low speed or ultra-high speed, and the speed application range of the weighing scale is far beyond that of the existing slide plate checkweigher.
Because the object to be weighed does not directly contact with the weight conduction piece, does not need to rush through the sliding plate by means of speed inertia, but is supported by the belt, the speed of the belt supporting body is constant, the object to be weighed which moves at a high speed cannot be decelerated, rotated or turned over due to frictional resistance, the weighing sampling is very stable, and the high precision of the weighing result is ensured. Due to the belt supporting the objects, objects moving at low speed (such as containers containing liquids) can also slide smoothly and be weighed with high precision.
3. Because of the smooth support of the belt, the weighed object with unsmooth bottom, moist or even sticky bottom can be used for weighing in a sliding plate mode. For example, some objects have rough bottoms and are not suitable for use in a slide checkweigher even if the slide is tilted more than 20 °. The scheme of this application has expanded the application range of current slide balance technique by a wide margin.
4. Because of the smooth support of the belt, objects with uneven bottoms can be detected in a sliding plate mode.
5. Because of the stable support of the belt, the container for containing various liquids can be conveniently weighed with high precision.
6. Because of the stable support of the belt, the gravity center of the weighed object is not required to be lower, and the high bottle and the high box can be used for weighing without overturning in sliding weighing.
7. Because set up two parallel belts that have certain interval for the installation of weight conduction spare and weighing sensor and base is very convenient, can directly fix or dismantle weight conduction spare between two belts, and the operation can be lifted by two belts to the uneven object in bottom, and is more steady.
8. The concave structure of the weight conduction piece can stably move objects with uneven bottoms, and high-precision weighing is realized.
9. The feeding sliding plate, the discharging sliding plate and the weight conduction piece are arranged on the base, so that the belt is very convenient to replace and adjust, and the original weighing parameter setting and weighing precision are not influenced.
10. The concave structures of the material smoothing sliding plate, the weight conduction piece and the discharging sliding plate are formed by bending metal plates, so that the material smoothing sliding plate is more smooth and convenient and has low cost, and the weighing precision is higher due to the consistency of the concave structures of the material smoothing sliding plate, the weight conduction piece and the discharging sliding plate. Smooth hard strips are fixed on the upper surfaces of the two convex sides of the concave frame, so that the replacement cost is lower.
11. The automatic weighing machine is suitable for production lines with strict requirements on the posture of objects after weight detection, such as code printing, boxing, stacking and the like after weight detection.
12. Slide checkweigher is no longer limited to having to tilt more than 20 °. Not only is suitable for horizontal arrangement of the upper surface of the weight conduction piece or arrangement of a small inclination angle smaller than 15 degrees, but also all the inclination angles suitable for the existing slide plate checkweigher are suitable for use.
Drawings
Fig. 1 is a perspective view of the present application. Fig. 2 is a schematic structural front view of the present application. FIG. 3 is a schematic structural view of the present application with a material arranging slide plate and a material discharging slide plate. FIG. 4 is a schematic view of the small angle inclination of the relative sliding contact surfaces of the feeding slide plate and the discharging slide plate. Fig. 5 is a left side sectional view of fig. 1. Fig. 6 is a perspective view illustrating a structure in which a weight transmitter is formed by bending a single plate, fig. 7 is a left side view illustrating fig. 6, fig. 8 is a perspective view illustrating a weight transmitter including a concave structure and a guide rail, and fig. 9 is a left side view illustrating fig. 8.
In the figure, 1-weight conduction piece, 2-weighing sensor, 3-base, 4-belt, 5-material sliding plate, 6-material discharging sliding plate, 7-object to be weighed, 8-left roller shaft, 9-right roller shaft, 11-fastener, 12-concave frame, 13-hard guide rail, 14-sliding contact surface, 19-motor, ZC-distance between the vertex of the left roller shaft or the rightmost contact point of the upper belt and the material sliding plate between the shafts relative to the leftmost contact point of the upper belt and the sliding contact surface between the shafts, YC-distance between the rightmost contact point of the upper belt and the sliding contact surface relative to the vertex of the right roller shaft or the leftmost contact point of the upper belt and the material discharging sliding plate between the shafts, WC-length of the object to be weighed along the belt running direction, SC-distance between the rightmost end point of the upper belt and the upper belt between the shafts relative to the leftmost contact point of the upper belt and the sliding contact surface between the shafts, the distance between the C-rightmost end point of the sliding contact surface and the inter-shaft upper belt in contact with the left-most contact point of the inter-shaft upper belt and the discharging sliding plate, the vertical distance between the ZJ-sliding contact surface and the inter-shaft upper belt in contact with the left-most contact point of the inter-shaft upper belt and the top plane of the material smoothening sliding plate, the vertical distance between the YJ-discharging sliding plate and the inter-shaft upper belt in contact with the sliding contact surface, the included angle of the A-material smoothening sliding plate top plane in inclination towards the upper right, the included angle of the B-discharging sliding plate top plane in inclination towards the lower right, the arrow-belt running direction and the length of the BC-sliding contact surface along the belt running direction.
Detailed Description
Example 1: a slide checkweigher, as shown in figures 1 and 2, comprises a weight conduction piece 1, a weighing sensor 2, a base 3 and an electric control cabinet, wherein the fixed end of the weighing sensor 2 is rigidly connected with the base 3, the weighing sensor 2 is electrically connected with the electric control cabinet, the top of the weight conduction piece 1 is provided with a smooth rectangular plane which is called a sliding contact surface 14 and is vertical to the bearing direction of the weighing sensor 2, the weight conduction piece 1 is directly and only rigidly connected with the bearing end of the weighing sensor 2, the slide checkweigher also comprises a belt conveying device, the belt conveying device comprises a belt 4 as shown by arrows in figure 2, the part of the belt 4 positioned at the upper part of the belt conveying device runs from left to right, the left and the right of the upper part of the belt conveying device are respectively provided with a left roller shaft 8 and a right roller shaft 9, the belt 4 passes through the left roller shaft 8 and the right roller shaft 9, the part of the belt 4 positioned between the upper peak of the left roller shaft 8 and the peak of, the belt is thin and flexible, the belt conveyor applies tensile tension on the belt 4 to enable the belt on the shaft to be almost flat, the weight conduction piece 1 is located between the left roller shaft 8 and the right roller shaft 9, the sliding contact surface 14 is in sliding contact with part of the lower surface of the belt on the shaft, the length of the object 7 to be weighed along the running direction of the belt is WC, the length of the sliding contact surface 14 along the running direction of the belt 4 is BC, BC is larger than WC, and the axes of the left roller shaft 8 and the right roller shaft 9 are parallel to each other and are both parallel to the sliding contact surface 14.
Belt conveyor only includes a belt 4, and belt conveyor only has two roller altogether of left roller 8 and right roller 9, and wherein left roller 8 is the driven shaft, and right roller 9 is the drive roll axle, and right roller 9 is driven by motor 19, and weight conduction spare 1 top only has a sliding contact face 14.
The apex of the cross section of the left roller shaft 8 is not lower than the sliding contact surface 14, and the apex of the cross section of the right roller shaft 9 is not higher than the sliding contact surface 14.
The distance between the top point of the section of the left roller shaft 8 and the leftmost contact point of the inter-shaft upper belt and the sliding contact surface 14 is ZC, the load bearing end of the weighing sensor 2 is displaced downwards by h after the weighed object 7 is directly pressed on the weighing sensor 2 when the inter-shaft upper belt does not exist, and the length of ZC needs to be ensured to be more than 57.3 multiplied by h and less than ZC and less than WC/2.
57.3 xh < ZC ensures that the check weight error due to the belt tension from the left roller shaft 8 direction alone is within 25mg under the following conditions: two belts, each having a thickness of 0.17mm, a width of 20mm, a belt tension of 1000g force, PVC material, a load cell range of 6000g, and a load cell load end maximum deflection of 0.36mm, wherein, when the angle change caused by moving down one end of the flat long ZC belt by h is 1 degree, the sum of the original tension of the belt and the tension of the increase of the belt elongation is 160g force, the theoretical error rate caused by the interchange of the sine function and the tangent function in the mathematical simplification model is 0.000152305, and the error caused by the tension after the multiplication of the two is about 0.025 g. Therefore, if the tension error caused by the inevitable function conversion error of the structure of the application is controlled to be within 25mg during the digital processing of the subsequent weighing results, the arctg (h/ZC) < 1 degree, that is, ZC > h/tg (1 degree) = 57.3 × h is required. If arctg (h/ZC) > 1, the error will increase dramatically.
ZC < WC/2 can ensure that the gravity center of the weighed object 7 is still on the top of the left roller shaft 8 when the weighed object crosses the upper sliding contact surface 14 from the top of the left roller shaft 8, so that the bottom right edge of the weighed object 7 is prevented from impacting the left edge of the sliding contact surface 14, the weighed object 7 can be smoothly moved onto the sliding contact surface 14, and weighing errors are reduced.
The distance between the rightmost contact point of the belt and the sliding contact surface 14 between the shafts and the vertex of the right roller shaft 9 is YC, YC is guaranteed, and 57.3 xh < YC < WC/2.
In keeping with the principle of limiting the length of the belt between the apex opposed sliding contact surface 14 of the left roller shaft 8 and the leftmost contact point of the belt on the shaft, 57.3 xh < YC ensures that the check weight error is within 25mg due to only the belt tension from the direction of the right roller shaft 9 under the following conditions: the thickness of the two belts is 0.17mm, the width of the two belts is 20mm, the belt tension is 1000g force, the belt elastic modulus is 70GPa, the measuring range of the weighing sensor is 6000g, and the maximum deflection of the bearing end of the weighing sensor is 0.36 mm.
YC < WC/2 can ensure that the gravity center of the weighed object 7 is still on the sliding contact surface 14 when the weighed object crosses the top of the upper right roller shaft 9 from the sliding contact surface 14, so that the bottom right edge of the weighed object 7 is prevented from impacting the top of the right roller shaft 9, the weighed object 7 can be smoothly moved onto the right roller shaft 9, and the weighing error is reduced.
In fact, by calibration, the effect of the weighing sensor 2, which is the sum of the original tension of the belt 4 and the tension increment caused by the belt 4 stretching due to the downward movement of the sliding contact surface 14 after loading, can be further greatly reduced.
The SCW-PLAC6000 checkweigher control module with the digital filtering function, which is produced by Shandong West Take instrument Co., Ltd, is only provided with a belt 4 with the width of 120mm and the thickness of 0.17mm, the tension of the belt 4 is 6000g, the PVC material is adopted, the measuring range of a weighing sensor 2 is 6000g, the maximum deflection of a bearing end of the weighing sensor 2 is 0.36mm, a paper packing box with the weight of 50g is weighed, the packing box is longer WC =60mm along the length direction of the belt 4 and longer than 106mm along the width direction of the belt 4 and has the height of 12mm, ZC = YC =20mm, the weight conduction piece 1 and an interaxial upper belt are only provided with a rectangular sliding contact surface 14, the length BC =150mm along the object running direction of the sliding contact surface 14 and the width perpendicular to the object running direction is 130mm, the packing box enables the bearing end of the weighing sensor 2 to move down h =0.003mm, the angle change caused by the 50g load is 0.0086 degrees, although the lead weight component, the effect of this plumb force component on the weighing result is counteracted. The production line speed is 400 boxes per minute, the speed of the belt 4 is 75 meters per minute, and the actual weighing precision of the scheme reaches 0.31 g.
In the belt checkweigher of the prior art, the weighing platform is 150mm in length, and the SCW-PLAC6000 checkweigher module of Shandong West Take instruments and Co is also adopted, so that when the same object with 400 boxes/minute is detected, the belt speed is 75 meters/minute, and the best precision is only 0.4 g. Therefore, the mechanical structure of this application scheme has improved prior art's weighing precision by a wide margin.
The two belts 4 move over the sliding contact surface 14 along with the object 7 to be weighed, and the unevenness of only the part of the bottom surface of the object 7 to be weighed, which is in contact with the belts 4, can affect the smoothness of the movement, so that the requirement of the slide checkweigher on the flatness of the bottom surface of the object 7 to be weighed can be reduced.
The total mass of the two belts 4 is much smaller than that of the belt of example 1, and the interference of the unevenness caused by the joint of the belts 4 on the weight transmission member 1 and the interference of the mass unbalance of each point of the belts 4 on the weight transmission member 1 are both greatly reduced.
Compared with the same test working condition of the embodiment 1, the actual weighing precision of the scheme reaches 0.28g, and the weighing precision is further improved compared with the embodiment 1.
The belt 4 with the width of 120mm supports the weighed object 7 to slide on the two sliding contact surfaces 14, and the unevenness of only the part of the bottom surface of the weighed object 7 above the sliding contact surfaces 14 can influence the smoothness of the running movement of the object, so that the requirement of the slide checkweigher on the flatness of the bottom surface of the weighed object 7 can be reduced.
One belt 4 holds the object 7 to be weighed and can prevent the content of the object from leaking to affect weighing.
Although the unevenness of the seam and the interference of unbalanced mass of the belt 4 with the width of 120mm still exist, the influence of the unevenness of the bottom surface of the object 7 to be weighed on the weighing precision is completely eliminated.
Compared with the same test working condition of the embodiment 1, the actual weighing precision of the scheme reaches 0.25g, and the weighing precision is further improved compared with the embodiment 1.
the device also comprises two independent and parallel belts 4, the width of each belt 4 is 20mm, each belt 4 has the tension of 1000g, 50g of load brings 0.60016g of plumb component force, but through digital calibration processing before testing, the influence of the plumb component force on a weighing result is counteracted; the distance between the centerlines of the two belts 4 in the belt running direction was also 66 mm.
The two belts 4 are in sliding contact with the two sliding contact surfaces 14, respectively.
The center lines of the two belts 4 along the belt running direction are respectively overlapped with the center lines of the two sliding contact surfaces 14 along the belt running direction.
Because the height of the other parts of the weight conduction piece 1, which are positioned outside the two sliding contact surfaces 14, is lower than the height of the two elongated planes, the part of the weighed object 7, which is not in contact with the belt 4, cannot contact with the weight conduction piece 1, and the weighed object 7 is moved by the two belts 4 in a supporting mode, the influence of the unevenness of the bottom surface of the weighed object 7 on the weighing precision is completely eradicated, and the requirement of the slide checkweigher on the flatness of the bottom surface of the weighed object 7 can be greatly reduced.
The total mass of the two belts 4 is much smaller than that of the belt of example 1, and the interference of the unevenness caused by the joint of the belts 4 on the weight transmission member 1 and the interference of the mass unbalance of each point of the belts 4 on the weight transmission member 1 are both greatly reduced.
Under the same test condition as that of the embodiment 1, the actual weighing precision of the scheme reaches 0.23g, and compared with the embodiment 1, the weighing precision is further improved.
Embodiment 5, a slide checkweigher, see fig. 3, the same as embodiment 4 will not be described again, except that a material slide 5 is further provided between the left roller shaft 8 and the sliding contact surface 14,
the top of the material smoothening sliding plate 5 is a smooth plane, the top plane of the material smoothening sliding plate 5 is parallel to the sliding contact surface 14, the top plane of the material smoothening sliding plate 5 is in sliding contact with the inter-shaft upper belt, the top plane of the material smoothening sliding plate 5 is not lower than the sliding contact surface 14, the distance between the rightmost end point of the contact between the material smoothening sliding plate 5 and the inter-shaft upper belt and the leftmost contact point of the inter-shaft upper belt and the sliding contact surface 14 is SC, and the SC length needs to be ensured to be 57.3 x h < SC < WC/2 as the limiting principle of related ZC and YC in the embodiment 1. The cross-sectional shape of the material smoothing sliding plate 5 is the same as that of the weight conduction piece 1, so that the weighed object 7 can smoothly cross the sliding contact surface 14 from the material smoothing sliding plate 5 under the support of the belt 4, the impact of the sensor belt 2 is avoided, the weighing precision can be greatly improved, and the weighing device is suitable for weighing high-speed objects. Because the smooth material sliding plate 5 is arranged, compared with the sliding contact surface 14 which is directly butted behind the left roller shaft 8, the longer smooth material sliding plate 5 guides the object 7 to be weighed, the smoothness of the sliding contact surface 14 on the object 7 to be weighed is greatly improved, and the trace of the guide rail which is dented at the bottom of the object 7 to be weighed is more consistent and the transition is more stable because the smooth material sliding plate 5 is the same as the cross section of the weight conduction piece 1. The material smoothing sliding plate 5 is rigidly connected with the base 3, so that the relative positions of the material smoothing sliding plate 5, the base 3, the weighing sensor 2 on the material smoothing sliding plate and the weight conduction piece 1 on the base are fixed, and when the position of the belt 4 of the belt conveying mechanism relative to the weight conduction piece 1 is adjusted, the relative positions of the material smoothing sliding plate 5 and the sliding contact surface 14 cannot be changed, so that the weighing precision is ensured, and the replacement and tension adjustment of the belt 4 are facilitated.
A discharging sliding plate 6 is further arranged between the weight conduction piece 1 and the right roller shaft 9, the top of the discharging sliding plate 6 is a smooth plane, the top plane of the discharging sliding plate 6 is parallel to a sliding contact surface 14, the top plane of the discharging sliding plate 6 is in sliding contact with an inter-shaft upper belt, the top plane of the discharging sliding plate 6 is not higher than the sliding contact surface 14, the distance between the rightmost end point of the sliding contact surface 14 in contact with the inter-shaft upper belt and the leftmost contact point of the inter-shaft upper belt and the discharging sliding plate 6 is CC, and the length of CC is required to be 57.3 x h < CC < WC/2. The cross-sectional shape of ejection of compact slide 6 and weight conduction piece 1 is the same, like this, is weighed on object 7 can smoothly stride over ejection of compact slide 6 by sliding contact surface 14 under being held by belt 4, can not bring the reaction impact by weighing sensor 2 again, can improve the weighing accuracy by a wide margin and adapt to the weighing of high-speed object. The discharging sliding plate 6 is rigidly connected with the base, so that the relative positions of the discharging sliding plate 6, the base 3, the weighing sensor 2 and the weight conduction piece 1 are fixed, and when the position of the belt 4 of the belt conveying mechanism relative to the weight conduction piece 1 is adjusted, the relative positions of the discharging sliding plate 6 and the sliding contact surface 14 cannot be changed, so that the weighing precision is ensured, and the replacement and tension adjustment of the belt 4 are facilitated.
The material guiding sliding plate 5 and the material discharging sliding plate 6 both have the same cross-sectional shape as the weight transmission piece 1, and can be disassembled and fixed from the space between the two parallel belts 4.
With the same test condition of embodiment 4, SC = CC =20mm, the length of the contact part of the material slide plate 5 and the belt 4 is 90mm, and the length of the contact part of the discharge slide plate 6 and the belt 4 is 90mm, because the weighed object 7 slides more smoothly when going up and leaving the sliding contact surface 14, the actual weighing precision of the scheme reaches 0.18g, the weighing precision is greatly improved compared with the prior art, and the effect is also greatly improved compared with embodiment 4.
The testing speed is reduced to 60 boxes/minute, the speed of the belt 4 is 15 meters/minute, the weighing precision of the scheme reaches 0.04g, and the method is also better than the prior art. The precision of the prior belt checkweigher is 0.06g under the same test speed and belt speed.
The top planes of the material smoothening sliding plate 5 and the material discharging sliding plate 6 can be coplanar with the sliding contact surface 14.
Example 6, a slide checkweigher, see fig. 4, and the same as example 5 will not be repeated, except that the top plane of the material slide 5 is inclined to the upper right by a small amount with respect to the sliding contact surface 14, the mutual included angle a is smaller than 10 °, the running linear velocity of the belt 4 is V, g is the local gravitational acceleration, the vertical distance from the leftmost contact point of the sliding contact surface 14 and the upper belt between the shafts to the top plane of the material slide 5 is ZJ, ZJ > 0.5 × g × SC/(V × V), thus, the object 7 to be weighed can smoothly move from the top plane of the material slide plate 5 to the sliding contact surface 14, the bottom right edge of the object 7 to be weighed is approximately ejected by inertia and finally falls on the sliding contact surface 14, instead of falling to the left of the left edge of the sliding contact surface 141 after being thrown out, the load cell 2 under the weight transmitter 1 is not disturbed due to the impact of the object 7 to be weighed and the left edge of the weight transmitter 1;
the top plane of the discharging sliding plate 6 inclines to the right lower side in a small range relative to the sliding contact surface 14, the mutual included angle B is smaller than 10 degrees, the vertical distance from the leftmost contact point of the belt between the discharging sliding plate 6 and the shaft to the sliding contact surface 14 is YJ, YJ is larger than 0.5 Xg × CC × CC/(VxV), therefore, the object 7 to be weighed can be smoothly moved to the top plane of the discharging sliding plate 6 from the sliding contact surface 14, and the object 7 to be weighed can not generate weighing precision error due to the fact that the object 7 is reacted on the weighing sensor 2 under the weight transmission piece 1 after being impacted with the left edge of the discharging sliding plate 6.
Under the same test conditions as in example 5, the belt speed is 75 m/min, 400 boxes per minute, A = B =5 degrees, ZJ = YJ =1.6mm, the weighing precision of the scheme reaches 0.16g, the precision is greatly higher than that of the prior art, and meanwhile, the adjustment of the material smoothing sliding plate 5 and the material discharging sliding plate 6 relative to the weight conduction piece 1 is very easy and simple, and the parallel and height difference between the material smoothing sliding plate 5 and the material discharging sliding plate 6 are not required to be strictly controlled. Because it is more steady to go up to sliding contact surface 14 and shift out sliding contact surface 14 on the object 7 of being weighed, so, the precision is higher than embodiment 5, more stable, can not appear because the bottom surface is uneven lead to the condition that the lower right corner of the object 7 of being weighed strikes weight conduction piece 1 or ejection of compact slide 6 lower right edge, this scheme because of installation adjustment convenience, precision are higher, the adaptability is more extensive.
The weight conduction piece 1 with the concave middle part can greatly reduce the requirement of the slide checkweigher on the flatness of the bottom surface of the object 7 to be weighed.
Example 10, the same as example 9 will not be repeated, except that, referring to fig. 6 and 7, the slide checkweigher, the concave structure of the weight transmitter 1 and the protrusions therein are formed by bending a single plate, and the bending line is parallel to the running direction of the belt 4.
Claims (15)
1. A slide plate checkweigher comprises a weight conduction piece, a weighing sensor, a smooth sliding contact surface arranged at the top of the weight conduction piece, a belt conveying device running along the material conveying direction, a belt, a roller shaft, a left roller shaft and a right roller shaft, a belt passing through the left roller shaft and the right roller shaft, an upper peak of the belt between the upper peak of the left roller shaft and the upper peak of the right roller shaft, an inter-shaft upper belt, a weight conduction piece between the left roller shaft and the right roller shaft, a sliding contact surface in sliding contact with the lower surface of the inter-shaft upper belt, and a weighed object with a length of WC along the running direction of the belt, the length of the sliding contact surface along the running direction of the belt is BC, BC is larger than WC, and the axes of the left roller shaft and the right roller shaft are parallel to each other and are parallel to the sliding contact surface.
2. The slide checkweigher as recited in claim 1, wherein a distance between a vertex of a cross section of the left roller shaft and a leftmost contact point of the inter-shaft upper belt and the sliding contact surface is ZC, a load bearing end of the load cell is displaced downward by h after the load cell is directly pressed against the load cell without the inter-shaft upper belt, and a length of ZC is secured as 57.3 x h < ZC < WC/2; the distance between the rightmost contact point of the belt and the sliding contact surface between the shafts and the top point of the right roller shaft is YC, YC is guaranteed, and 57.3 xh is more than YC and less than WC/2.
3. The slide checkweigher of claim 1 wherein the belt conveyor includes two separate and parallel belts.
4. The slide checkweigher as claimed in claim 1, wherein the weight-transmitting member has two mutually independent sliding contact surfaces of the same shape and size, each having a long side arranged along the belt running direction, and the height of the other portion of the weight-transmitting member than the two sliding contact surfaces is lower than the height of the two sliding contact surfaces.
5. The slide checkweigher as claimed in claim 1, wherein the weight-transmitting member has two mutually independent sliding contact surfaces of the same shape and size, the long side of each sliding contact surface being arranged along the belt running direction, and the height of the other portion of the weight-transmitting member than the two sliding contact surfaces being lower than the height of the two sliding contact surfaces; the device also comprises two independent and parallel belts; the two belts are in sliding contact with the corresponding sliding contact surfaces respectively.
6. The slide checkweigher of claim 1, wherein a take-off slide is further provided between the left roller shaft and the sliding contact surface, the top of the take-off slide is a smooth surface, the top surface of the take-off slide is coplanar or parallel to the sliding contact surface, the top surface of the take-off slide is in sliding contact with the inter-shaft upper belt, the top surface of the take-off slide is not lower than the sliding contact surface, the distance between the rightmost end point of the take-off slide in contact with the inter-shaft upper belt and the leftmost contact point of the inter-shaft upper belt and the sliding contact surface is SC, and the SC length satisfies the following condition that 57.3 x h < SC < WC/2.
7. The slide checkweigher as recited in claim 1, wherein a discharge slide plate is further provided between the weight transmitter and the right roller shaft, the top of the discharge slide plate is a smooth surface, the top surface of the discharge slide plate is coplanar or parallel to the sliding contact surface, the top surface of the discharge slide plate is in sliding contact with the inter-shaft upper belt, the top surface of the discharge slide plate is not higher than the sliding contact surface, the distance between the rightmost end point of the sliding contact surface in contact with the inter-shaft upper belt and the leftmost contact point of the inter-shaft upper belt and the discharge slide plate is CC, and the CC length satisfies the following condition that 57.3 x h & lt CC & lt WC/2.
8. The slide checkweigher of claim 1, wherein a material slide plate is further disposed between the left roller shaft and the sliding contact surface, the top of the material slide plate is a smooth surface, the top surface of the material slide plate is in sliding contact with the inter-shaft upper belt, the distance between the rightmost end point of the material slide plate in contact with the inter-shaft upper belt and the leftmost contact point of the inter-shaft upper belt in contact with the sliding contact surface is SC, and the SC length satisfies the following condition that SC < WC/2 > is 57.3 xh; the top plane of the material smoothening sliding plate inclines to the right upper side in a small range relative to the sliding contact surface, the mutual included angle A is smaller than 10 degrees, the running linear speed of the belt is V, g is the local gravity acceleration, the vertical distance from the leftmost contact point of the sliding contact surface and the upper belt between the shafts to the top plane of the material smoothening sliding plate is ZJ, and ZJ is larger than 0.5 Xg XSC/(V).
9. The slide checkweigher as recited in claim 1, wherein a discharge slide plate is further provided between the weight transmitting member and the right roller shaft, the top of the discharge slide plate is a smooth surface, the top surface of the discharge slide plate is in sliding contact with the inter-shaft upper belt, the distance between the rightmost end point of the sliding contact surface in contact with the inter-shaft upper belt and the leftmost contact point of the inter-shaft upper belt and the discharge slide plate is CC, the CC length is ensured to be 57.3 xh < CC < WC/2; the top plane of the discharging sliding plate is slightly inclined towards the right lower side relative to the sliding contact surface, the mutual included angle B is smaller than 10 degrees, the vertical distance from the leftmost contact point of the discharging sliding plate and the upper belt between the shafts to the sliding contact surface is YJ, and YJ is larger than 0.5 Xg × CC × CC/(V × V).
10. The slide checkweigher of claim 1 wherein the belt conveyor is a multi-roller configuration and further including a third roller below the plane of the left and right roller shafts, with sufficient space between the belt and the third roller between the shafts to accommodate the weight transmitters and the load cells.
11. The slide checkweigher as claimed in claim 3 or 5, wherein the load cell is interposed between two parallel belts, the base is disposed outside the two belts, and the weight transmitting member is fastened to the load cell.
12. The slide checkweigher as claimed in claim 4 or 5, wherein the weight-transmitting member has a cross-section perpendicular to the belt running direction in a "concave" shape, and protrusions are provided upward on both sides of the weight-transmitting member; the upper surfaces of the two bulges are sliding contact surfaces; the width of the sliding contact surface is less than or equal to the width of a belt in sliding contact with the sliding contact surface, and the height of the upper surface of the middle part of the weight transmission piece is lower than that of the strip-shaped smooth planes on the two sides.
13. The slide checkweigher of claim 12, wherein the "concave" shaped configuration of the weight transmitting member and the protrusions therein are formed by bending a single piece of sheet material, the bending line being parallel to the direction of belt travel.
14. The slide checkweigher as claimed in claim 4 or 5, wherein the weight-transmitting member has a cross-section perpendicular to the belt running direction in a "concave" shape, and protrusions are provided upward on both sides of the weight-transmitting member; the concave structure of the weight transmission piece comprises a concave frame made of light materials and a hard guide rail which is fixedly connected with bulges on two side surfaces of the concave frame and is provided with a smooth upper surface, the length direction of the hard guide rail is consistent with the running direction of a belt, and the upper surface of the hard guide rail is a sliding contact surface.
15. The slide checkweigher as claimed in claim 1, wherein a belt conveyor for rejecting defective objects is connected after the right roller shaft, and two pneumatic nozzles are provided on the rejecting belt conveyor in an up-down overlapping manner, each nozzle corresponding to one solenoid valve, and the two pneumatic nozzles are directed in the same direction and position.
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| CN201921658274.4U CN210346882U (en) | 2019-09-30 | 2019-09-30 | Slide plate check weighing scale |
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| CN201921658274.4U CN210346882U (en) | 2019-09-30 | 2019-09-30 | Slide plate check weighing scale |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113588062A (en) * | 2020-04-30 | 2021-11-02 | 梅特勒-托利多(常州)测量技术有限公司 | Method and system for measuring interference of weight detection equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113588062A (en) * | 2020-04-30 | 2021-11-02 | 梅特勒-托利多(常州)测量技术有限公司 | Method and system for measuring interference of weight detection equipment |
| CN113588062B (en) * | 2020-04-30 | 2024-02-02 | 梅特勒-托利多(常州)测量技术有限公司 | Method and system for measuring interference of detection equipment |
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