CN109238422B - Weighing counting method and device - Google Patents
Weighing counting method and device Download PDFInfo
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- CN109238422B CN109238422B CN201811242318.5A CN201811242318A CN109238422B CN 109238422 B CN109238422 B CN 109238422B CN 201811242318 A CN201811242318 A CN 201811242318A CN 109238422 B CN109238422 B CN 109238422B
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- 238000005303 weighing Methods 0.000 title claims abstract description 285
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
- G01G19/387—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for combinatorial weighing, i.e. selecting a combination of articles whose total weight or number is closest to a desired value
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Abstract
A weighing counting method and device comprises the following steps: parameters are set on the weighing instrument. The weighing instrument records the current total weight on the weighing platform as the total weight T before loading, and records the total number N=0 on the weighing platform. The stacking mechanism continuously collects a small stack of products with the length of a material receiving time t less than or equal to SM from the production conveyor belt, the small stacks of products are moved onto the weighing platform at one time, and the weighing instrument takes the stabilized weighing value as the current total weight G. The weighing instrument calculates (G-T)/M, adding M to the total number N. And judging the weighing instrument. And the weighing instrument outputs an alarm instruction. The weighing counting device uses a weighing platform and a weighing instrument to form weighing equipment, and a stacking mechanism is arranged between the continuously running production conveyor belt and the weighing platform and is electrically connected with the weighing instrument, and the stacking mechanism bears a plurality of products unloaded from the production conveyor belt within a certain time and is controlled by the weighing instrument to convey the bearing products to the weighing platform.
Description
Technical Field
The invention relates to the field of weighing and counting, in particular to a weighing and counting method and device for standard weight products.
Background
Packaging products of solid bulk materials such as foods, medicines, health care products, daily chemicals, hardware and the like, packaging products filled by liquid, ointment and the like, particularly soft bag packaging products, are usually subjected to counting statistics by a packaging machine because packaging machines are often required to be connected with packaging materials or to be replaced with packaging materials, packaging trial production by debugging machines is required, empty bags or packaging non-standards are also often generated in normal production, operators are required to be removed, counting statistics cannot be carried out by the packaging machines, and the counting statistics is usually carried out by firstly carrying out by using large frame material connection and leaving the large frame material connection for later procedures. The single multi-column packing machine is not smooth in cutting the packing materials during blanking and sealing, or when the discharge ports of the plurality of packing machines are connected with the same conveying line, products are often overlapped with each other or single-package folding occurs on the production conveying line, at the moment, the single packing machine cannot accurately pick up and count through the pneumatic sucker, cannot count through a photoelectric or imaging mode, and cannot realize automatic counting through stacking in a standard box body; at present, most of the counting is performed manually, so that the demands of hands are high, the labor intensity is high, the efficiency is low, the cost is high, and mistakes are easy to occur. Also, it is difficult to automatically count the number of standard manufactured articles machined by casting, injection molding, extrusion, pressing, dividing, die cutting, stamping, etc., as well as standard weight automobile parts, electronic, plastic or metal components, etc., if they are overlapped and staggered with each other on a continuously moving production conveyor.
The weights of standard products which are produced by the packaging machines or machined are basically consistent, errors on target weights are within a certain range, and the number of objects can be rapidly obtained by dividing the target weights of single products by integral weighing and rounding. This approach may result in a large error in the number of weighed products. In many production sites, the weight error of each product is within a certain range, but the weight of the product may be larger or smaller in a certain time due to different adjustment conditions of production equipment.
And weighing equipment with high precision is adopted, and weighing errors can be ignored. Assuming that the deviation range of the actual weight of the standard product from the target weight is 3% = 0.03, then N standard products within 16 (including 16) are weighed together, the weight value is divided by the target weight and rounded to an integer, N products will still be obtained; if 16 pieces of product weight with 3% of weight and divided by the standard weight are 16.48, obviously, the result is correct when the product weight is rounded to an integer of 16; and the sum of 17 weight-biased products is divided by the standard weight of a single product to obtain 17.51, and the whole number 18 is obtained after rounding to the whole number, so that one product is added; this 16 is the upper limit of the small pile weighing counting error; if the actual weight deviations are large and reach 3%, weighing N products in 17 to 49 together to obtain (N+1) products, and 50 or more N products to obtain (N+2) or more products; on the contrary, if the N products within 17 to 49 are weighed together, the N products of (N-1) and 50 or more are obtained, and the N products of (N-2) or less are obtained. The larger the number of products weighed at a time, the larger the deviation, and the larger the total error.
Document 201810093466.9 describes the following method: relates to a weighing counter and a weighing counting method, in particular to a bar weighing counter and a weighing counting method. The front end of the conveying chain is provided with a counting sensor, the side lower part of the conveying chain is provided with a blanking groove, the front of the blanking groove is provided with a bundling table, the bottom of the blanking groove is provided with a weighing sensor, and the lower part of the blanking groove is connected with a foundation through a connecting rod and a hydraulic connecting rod. When the bar materials are conveyed to the blanking groove by the conveying chain, when the weight of the bar materials is close to the weight capable of distinguishing the number, a signal is sent to the counting sensor, the hydraulic connecting rod of the blanking groove is compressed, the blanking groove is inclined and overturned, the bar materials fall onto the bundling table, the number of each weighing is accumulated and summed until bundling is carried out, and the total number is given; the weighing sensor transmits the weight to the processor, and the processor receives the weight data and determines the number of the bars by using the tolerance range of the weight data of the bars.
The prior weighing and counting techniques represented by the above documents are essentially: clearing the weighing platform, loading a single product onto the weighing platform, weighing, loading the next product, weighing, stopping until the total weight of the products on the weighing platform reaches the upper error limit, calculating the number C of the products on the weighing platform, and clearing all the existing products (on the bundling machine) on the weighing platform to enable the weighing platform to be mechanically reset; always circulate and accumulate the total number of all products. When A products are counted from a large number of standard products, if A is larger than or equal to L, the weighing platform is emptied L times in the prior art, and the mechanical and weighing platform and the instrument are reset L times. Obviously, unloading the empty and mechanical reset and the bench meter reset take too much time.
It can be seen that the existing weighing and counting techniques represented by the above documents have the following drawbacks: since it is necessary to instruct the counting sensor 3 to vertically drop the baffle 9 when the number of products on the weighing platform reaches the number which can be resolved, as can be seen from fig. 1, it is essential that the conveyor chain is not stopped but only the movement of the steel bar on the conveyor chain (there is serious relative friction between the steel bar and the conveyor chain), thereby preventing the conveyor chain 1 from continuing to feed the blanking tank 4, and for flexible packages, such preventing movement would seriously damage the package; the baffle 9 is vertically dropped, so that the steel bar is not damaged, but the conveying chain is damaged, and the soft packages such as bagged milk, medicine bags, rice bags, salt bags and the like are unsuitable, and the continuous production conveyor belt is not suitable for the condition that products are piled up. The weighing period of the number C corresponding to each error upper limit is required to be unloaded, mechanically reset and reset by the weighing platform instrument, and takes too much time, and the period is too long to be suitable for weighing and counting products on a high-speed continuous production conveyor belt. Because it needs to instruct the counting sensor 3 to make the baffle plate 9 vertically drop to prevent the continuous feeding of the weighing platform when the number of products on the weighing platform reaches the distinguishable number, if the products on the conveying chain are piled up, the scheme can not control the conveying chain to convey steel bars one by one to the weighing platform, more than 2 steel bars can be possibly provided, and the number of the steel bars on the weighing platform is more than the distinguishable number, so that possible counting errors occur. Therefore, this solution is not suitable for continuous production in which there is a build-up of product on the conveyor. The receiving equipment or receiving operators at the downstream of the weighing platform frequently and repeatedly act, so that the efficiency is low and the labor intensity is high. For the high-speed continuous moving production conveyor belt, if standard products are scattered or piled on the conveyor belt at irregular intervals, the weighing device needs to be used for accurately weighing objects on the weighing platform for a certain period of time, and the continuous moving high-speed production conveyor belt randomly drops materials, so that the condition that the products on the weighing platform of the weighing device have enough weighing time cannot be met, and the weighing device cannot give accurate quantity. Obviously, this existing weighing and counting method is not suitable for the irregular scattering or mutual accumulation of products on a high-speed production conveyor belt.
Disclosure of Invention
According to the invention, continuous product flow is cut into a small pile and a small pile with the number smaller than the upper limit of the small pile weighing counting error according to a small period of time and a small period of time, so that the total weight of the small pile is weighed in a one-time-sharing manner, the total weight difference before and after the feeding and the product number and the accumulated total number of the small pile are calculated, and the safe, accurate weighing and accurate counting of unordered standard products (including soft package products) on a high-speed continuous conveying line are realized.
The technical measures adopted by the invention are as follows: the weighing and counting method is characterized by comprising a weighing device formed by a weighing platform and a weighing instrument, and a stacking mechanism arranged between a continuous production conveyor belt and the weighing platform, wherein the stacking mechanism is electrically connected with the weighing instrument and comprises the following steps of:
(1) Setting parameters on a weighing instrument: setting a target weight m of a single product; calculating a small pile weighing counting error upper limit SM of the number of products loaded on a weighing platform each time according to a deviation rate a of the weight of the single product on the production conveyor belt to a target weight m of the single product, wherein if 0.5/a is an integer, SM= (0.5/a) -1; if 0.5/a is not an integer, SM takes the integer part of 0.5/a; the number P of targets (the number of standard products contained in one large package) and the number difference D (the alarm prompt threshold value of the difference between the total number of all standard products on the weighing platform and the number P of targets) are set (D < SM).
(2) The weighing instrument records the current total weight on the weighing platform as the total weight T before loading, and records the total number N=0 on the weighing platform.
(3) The stacking mechanism continuously collects a small stack of products with the length of a material receiving time t less than or equal to SM from the production conveyor belt, the small stacks of products are moved onto the weighing platform at one time, and the weighing instrument takes the stabilized weighing value as the current total weight G.
(4) The weighing meter calculates (G-T)/M, rounds the number m= [ (G-T)/M ] of products in the loaded small stack to an integer value, adds M to the total number N (i.e., marks (n+m) as N), and outputs N.
(5) And (3) judging a weighing instrument: if the absolute value of N is more than or equal to (P-D), entering the step (6); otherwise, the current total weight G is taken as the total weight T before loading (i.e., t=g) of the next loading, and the process returns to step (3).
(6) And the weighing instrument outputs an alarm instruction.
The specific characteristics of the scheme are that in the step (1), the material receiving time t (seconds) for continuously collecting a small pile of products is determined according to the average flow V (in seconds), the peak flow Vp (in seconds) and the peak time tp (seconds) of standard products on the production conveyor belt, and t=SM/V+ (1-Vp/V) multiplied by tp.
The specific characteristics of this scheme are still: adding the step (7): if the load is to be reloaded and the weighing is counted, returning to the step (2); otherwise, ending.
The weighing and counting device comprises a weighing platform and a weighing instrument electrically connected with the weighing platform, and is characterized by further comprising a stacking mechanism which is electrically connected with the weighing instrument, wherein the stacking mechanism is arranged between a continuously running production conveyor belt and the weighing platform, and is used for carrying a plurality of products unloaded from the production conveyor belt within a certain time and conveying the carried products to the weighing platform under the control of the weighing instrument.
The specific characteristics of this scheme are still: the stacking mechanism is a belt conveyor or a chain plate conveyor, the outer surface of the belt or the chain plate of the belt conveyor or the chain plate conveyor is provided with equally-divided partition plates, the surface of the whole belt or the chain plate is divided into 2K sections, K is more than or equal to 2, each section forms a partition with two high ends and a low middle, K sections are arranged on the upper surface of the belt or the chain plate when the belt or the chain plate is stopped, and K sections are arranged on the lower surface of the belt or the chain plate.
The belt conveyor or the chain plate conveyor can be driven by a stepping servo motor, the moving length of the belt or the chain plate in a product loading period can be precisely controlled, and a shading object or a light hole for photoelectric position calibration can be additionally arranged at the position of the section of the belt conveyor or the chain plate conveyor, which is staggered to receive materials, so that the consistency of the position of the section of the belt conveyor or the chain plate conveyor, which is connected with the materials, after long-time operation, can be ensured.
The stacking mechanism is a hopper with a hopper door at the bottom, the hopper is positioned below a discharge hole of the production conveyor belt and above the weighing platform, and the opening and closing of the hopper door are controlled by the weighing instrument.
The stacking mechanism is a rotating wheel, the rotating wheel is positioned below a discharge hole of the production conveyor belt and above the weighing platform, the rotating wheel is driven by a rotating wheel rotation driving device, a rotating shaft of the rotating wheel rotation driving device is horizontally arranged, the rotating wheel is composed of n (6 is more than or equal to n is more than or equal to 2) smooth partition plates which are uniformly arranged along the rotation circumference and are radiated outwards from the center of the rotating shaft, the two ends of the rotating shaft are provided with baffle plates, and the action of the rotating wheel is controlled by the weighing instrument.
The stacking mechanism is a turntable, the turntable is positioned below a discharge hole of the production conveyor belt and above the weighing platform, a rotating shaft of the turntable is vertical to a horizontal plane, the turntable consists of a grating disk and a smooth supporting plate, a turntable driving device drives the grating disk to rotate, the supporting plate is fixed, the grating disk consists of n gratings which are distributed at equal angles on the same circumference with the rotating shaft of the turntable as a circle center, the gratings consist of an inner ring plate, a vertical grating plate and an outer ring plate which radiate outwards from the center of the rotating shaft of the turntable, the gratings are transparent up and down, the gratings can also be an upper and lower transparent tube, the supporting plate is provided with a notch which corresponds to the gratings and corresponds to the grating in shape and size at the position opposite to the weighing platform, the discharge hole of the production conveyor belt and the weighing platform are staggered in the vertical direction, one or more gratings correspond to the discharge hole of the production conveyor belt, when the gratings with products in the grating disk rotate to the notch position of the supporting plate, the small stack of products fall onto the weighing platform at one time, and the action of the turntable is controlled by the weighing instrument.
The stacking mechanism can also be a screw conveyor, and the screw conveyor is controlled to rotate for a certain angle to push a certain number of weighing platforms on the products.
When the stacking mechanism is a belt conveyor, a rotating wheel, a rotating disc or a spiral conveyor, a stepping servo motor can be adopted to drive, the rotating speed, the rhythm and the angle can be precisely controlled, and the feeding amount in a product loading period can be approximately controlled.
The weighing platform is located the discharge gate below of the mechanism of piling, the weighing platform is by weighing the belt conveyor and rather than rigid connection's weighing sensor composition, the belt conveyor left side of weighing is provided with the material loading belt conveyor, the right side is provided with the unloading belt conveyor, the material loading belt conveyor, all there is the turnover receiving frame of same weight and shape above the belt conveyor of weighing, the material loading belt conveyor, weighing belt conveyor, unloading belt conveyor all are connected with weighing instrument electricity, the product of weighing is poured into the turnover receiving frame on the belt conveyor of weighing, when N is greater than (P-D) =100-6=94, weighing equipment sends the warning, simultaneously weighing instrument control material loading belt conveyor, weighing belt conveyor, unloading belt conveyor simultaneously and synchronous to the right side removes turnover receiving basket, the turnover receiving frame that is equipped with N medicine bags on the belt conveyor of weighing is removed to the unloading belt conveyor, prepare next turnover receiving weighing according to weighing instrument, the total number of the turnover frame that the operator can remove to the total number of the total turnover basket that the total number of the product of P has been removed to the total number of the weighing instrument is equal to the total number of the turnover basket that the operator has moved to P to the total number of the turnover basket.
The beneficial effects of the invention are as follows: the invention cuts the continuous product flow into a small pile and a small pile, so that the small pile is integrally loaded in a time-sharing way, the weighing platform and the total weight of the product on the weighing platform are weighed, the total weight difference before and after loading and the number and the accumulated total number in the small pile are calculated, and the following technical effects are generated.
The standard products scattered or piled up at irregular intervals on the continuously moving production conveyor belt are cut into a small pile and a small pile between the production conveyor belt and the weighing platform by the pile separating mechanism, and then the weighing platform is respectively moved by taking the whole small pile as a unit, so that stable weighing time intervals are reserved between the piles, and the beneficial effects are as follows: the continuous operation of the production conveyor belt is not affected, and the products and the conveyor line are not damaged; the problem of accurate weighing of all small piles is solved;
the problem that standard products scattered or piled on a continuously moving production conveyor belt at irregular intervals cannot be accurately weighed in the prior art is solved; the problem of the accurate weighing of flexible package is solved.
According to the deviation rate a of the weight of the standard product on the production conveyor belt to the target weight, only a small pile of products with the quantity less than or equal to the upper limit SM of the small pile weighing counting error (SM= (0.5/a-1) if 0.5/a is an integer, and the SM takes the integer part of 0.5/a if 0.5/a is not an integer) is loaded each time, the total weight of the small pile of products (including all the products loaded before and after the small pile of products) on a weighing platform is respectively weighed, the difference of the total weight of the weighing platform before and after the small pile of products is loaded is calculated, the weight value of the small pile of products loaded at this time is obtained, the weight value is divided by the target weight m, the whole weighing is carried out after the whole weighing is carried out, the corresponding accurate quantity of the small pile of products loaded at this time is calculated, and the accurate counting problem after the small pile of products is accurately weighed is solved.
The problem of accurate counting of a large number of standard products is solved by cutting off current, dividing small stacks, weighing the total weight before and after, calculating the difference between the total weight before and after, counting the small stacks and accumulating the number of the small stacks into the total number.
The total weight of all products on the weighing platform before and after each loading is weighed, the weighing platform is not required to be frequently unloaded and emptied, each small pile is not required to be moved out of the weighing platform and then the next small pile is required to be weighed, and the problem of rapid weighing of the products on a high-speed conveying line is solved; and the problem of labor intensity of downstream equipment and personnel during frequent material receiving is solved. Compared with the prior art, the method has the following advantages: 1) High efficiency, simplicity, rapidness and low cost, and is particularly suitable for continuous production of conveyor belts at high speed; 2) The downstream receiving equipment or receiving operators only act once when the total number of products approaches or reaches the total number, so that the efficiency is high and the labor intensity is low.
The judgment warning of the number of small piles at each time is set, and the situation of the number of last feeding and the feeding time of the feeding equipment are fed back to an operator, so that the concentration degree of the operator is reduced.
By setting the number and the number difference of the targets, the alarm when the number is close to the total number of the targets is realized, and the product is added or subtracted by the hand to realize the accurate loading or unloading of the total number of the targets, thereby solving the problem of semi-automatic accurate counting of the weighing counting device. Although semi-automatic, still realized weighing the count fast, intensity of labour is little, reduces the manual work, efficient, fast, the precision is high, with low costs.
Drawings
Fig. 1 is a schematic view of the structure of the device of the present invention. Fig. 2 is a schematic structural view of a device adopting a hopper type stacking mechanism. Fig. 3 is a schematic structural view of a wheel type stacking mechanism adopted by the device of the invention. Fig. 4 is a schematic top view of the apparatus of the present invention employing a turntable-type stacking mechanism. Fig. 5 is a schematic front view of fig. 4. Fig. 6 is a schematic structural view of a weighing belt conveyor used for the weighing platform of the present invention.
In the figure, a 1-production conveyor belt, a 2-product, a 3-belt conveyor, a 4-weighing platform, a 5-hopper door, a 6-hinge shaft, a 7-partition plate, an 8-outer ring plate, a 9-turntable rotation driving device, a 10-tray, a 11-runner rotation driving device, a 12-vertical grid plate, a 13-inner ring plate, a 14-feeding belt conveyor, a 15-weighing belt conveyor, a 16-discharging belt conveyor and a 17-weighing sensor, and the arc arrow is the rotation direction.
Detailed Description
Example 1: a weighing counting method, it uses weighing platform 4 and weighing instrument to form the weighing apparatus, the weighing instrument chooses SCW-PLC200 type weighing controller produced by Shandong Sitek instrument limited company, also set up the stack mechanism between continuous running production conveyor 1 and weighing platform 4, weighing platform 4 is by receiving the material platform (or receiving the material frame) and weighing sensor composition of rigid connection with it, the stack mechanism is connected with weighing instrument electricity, comprising the following steps:
(1) Setting parameters on a weighing instrument:
setting a target weight m of a single product; calculating a small pile weighing counting error upper limit SM of the number of products loaded onto the weighing platform 4 each time according to the deviation rate a of the weight of the single product on the production conveyor belt to the target weight m of the single product, wherein if 0.5/a is an integer, SM= (0.5/a) -1; if 0.5/a is not an integer, SM takes the integer part of 0.5/a; the number P of targets (the number of standard products contained in one large package) and the number difference D (the alarm prompt threshold value of the difference between the total number of all standard products on the weighing platform and the number P of targets) are set (D < SM).
(2) The weighing instrument records the current total weight on the weighing platform as the total weight T before loading, and records the total number N=0 on the weighing platform.
(3) The stacking mechanism continuously collects a small stack of products with the length of a material receiving time t less than or equal to SM from the production conveyor belt, the small stacks of products are moved onto the weighing platform at one time, and the weighing instrument takes the stabilized weighing value as the current total weight G.
(4) The weighing meter calculates (G-T)/M, rounds the number m= [ (G-T)/M ] of products in the loaded small stack to an integer value, adds M to the total number N (i.e., marks (n+m) as N), and outputs N and M.
(5) And (3) judging a weighing instrument: if the absolute value of N is more than or equal to (P-D), entering the step (6); otherwise, the current total weight G is taken as the total weight T before loading (i.e., t=g) of the next loading, and the process returns to step (3).
(6) The weighing instrument outputs a warning instruction to prompt an operator to unload.
The worker can add (P-N) products into the total offloaded products, so that the total number is equal to P; if (P-N) is less than 0, the worker needs to take out (N-P) products from the unloaded products, so that the total number of the products is equal to P; or only the total number N of the unloading can be recorded.
(7) If the load is to be reloaded and the weighing is counted, returning to the step (2); otherwise, ending.
Example 2: the weighing and counting method is the same as that of the embodiment 1, and the differences are as follows: step 1 further includes determining a material receiving time t (seconds) for continuously collecting a small stack of products according to an average flow V (in/second), a peak flow Vp (in/second) and a peak time tp (seconds) of standard products on the production conveyor belt, wherein t=sm/v+ (1-Vp/V) ×tp.
Example 3: as shown in fig. 1, a weighing and counting device comprises a stacking mechanism, a weighing platform 4 and a weighing instrument, wherein the stacking mechanism and the weighing platform 4 are electrically connected with the weighing instrument, the weighing platform 4 and the weighing instrument form weighing equipment, the weighing instrument is an SCW-PLC200 type weighing controller manufactured by Shandong Sitek instrument limited company, the stacking mechanism is arranged between a continuously running production conveyor belt 1 and the weighing platform 4, and standard products 2 scattered or piled on the continuously moving production conveyor belt 1 at irregular intervals are collected into a small stack according to the time period of the material collecting time t and then are moved to the weighing platform 4 at one time. The pile-dividing mechanism is a belt conveyor 3, an equally-divided partition plate is arranged on the outer surface of a belt of the belt conveyor 3, the whole belt surface is divided into 4 sections, each section forms a partition with two high ends and a low middle, 2 sections are arranged on the upper surface when the belt stops, and 2 sections are arranged on the lower surface.
Product 2 is a plastic packaged medicine bag with weight of 10G, the weighing error of the weighing device is 0.09G, the deviation rate a=3% =0.03 of the weight of all products 2 to the target weight M, the number of packages loaded each time is less than or equal to SM=16 (0.5/a=16.66667, the SM takes an integer part of 0.5/a and is 16), the feeding speed (480 packages/min in 4 seconds) of one or more packaging machines to the production conveyor belt 1 is 120 packages/min (namely, the average flow v=120 packages/min=2/s), the stacking is arranged between the products 2, the peak flow vp=4/s, the peak time tp=2 s, the material receiving time t=sm/v+ (1-Vp/V) ×tp=6 s, the target number P is 100, the number difference D is 6 < SM, the intermittent start and stop of the belt conveyor 3 is controlled according to the stacking condition of the production conveyor belt 1, stopping for a long time and moving rapidly for a short time in each period, so that one section or a grid is positioned below the production conveyor belt 1, waiting for a total receiving time T for long stopping and quick starting, pouring a small pile of products 2 received by the section onto the weighing platform 4 once, stopping immediately, continuing to receive the subsequent products 2 on the production conveyor belt 1 from the rear section on the belt conveyor 3, at the moment, accurately weighing the total weight of all the products 2 including the products just poured and the products just poured by the weighing platform 4 stably, subtracting the total weight T of the weighing platform from the total weight G of the weighing platform at the last time to obtain the weight of the products in the small pile just poured at the time, dividing the weight of the small pile of products by the target weight M, rounding the whole number to obtain the number M of the products in the small pile at the time, and (3) accumulating M into the total number N until the total number N is greater than (P-D) =100-6=94, giving a warning by the weighing equipment, moving out all the medicine bags on the weighing platform by an operator, restarting counting by the weighing platform, and manually adding and subtracting the moved out products according to the difference of the total number N to P so that the total number of the moved out products is equal to P.
The belt conveyor 3 is driven by a stepping servo motor, the moving length of the belt in a product loading period is precisely controlled, and a shading object or a light hole for photoelectric position calibration is additionally arranged at the position of the section of the belt conveyor 3, which is staggered with the material receiving section, so that the consistency of the position of the material receiving section at the upper part of the belt conveyor 3 after long-time operation is ensured.
The result is as follows, the intermittent start and stop of the belt conveyor 3 is set, the material receiving time t is set to be 6s, each time the material is received at about 12 (less than or equal to 16) packages, the actual material receiving load number is within 9-15 packages due to the fact that peak flow and sometimes larger gaps are formed by stacking between the products 2 on the production conveyor 1, and a load weighing period occupies about 6 seconds, wherein: the belt conveyor 3 is stationary receiving material for 5.5 seconds, then is started quickly, and one cell on the belt is completely emptied for 0.5 seconds (during this period, dynamic receiving material may be collected in the present section cell of the belt conveyor 3, and also may be collected in the next section cell of the belt conveyor 3). On the other hand, for a symmetrical weight, the bags all fall on the weighing platform 4 and settle for 0.5 seconds, the weighing and other operation time is 5.5 seconds, in fact, the accurate weight value can be weighed in 1 second, the counting is naturally accurate, and other operations can be performed in the remaining 4.5 seconds of the period). The 8 times of loading take about 48 seconds, the total number of medicine bags on the weighing platform 4 approaches 96 bags, the weighing equipment alarms, and after the weighing equipment receives the alarm, workers firstly remove all the products 2 on the weighing platform 4 from the weighing platform, and then manually feed or subtract the materials, so that the batch reaches 100 bags. The labor intensity of workers is greatly reduced, counting errors are avoided, 2-3 people are needed for counting bags manually, and only 1 person is needed at present.
The weighing and counting can also be carried out by placing a turnover basket with uniform weight and size and shape on the weighing platform 4, and after a new turnover basket is placed on the weighing platform 4, the weight of the turnover basket and the weight of the mechanical structure of the weighing platform 4 are stored into the total weight T before the first loading as the total weight G read for the first time; removing a sufficient number or close to the target total number of products and turnover baskets, and putting a new turnover basket again, wherein the gap is 4.5 seconds, so that workers can operate very gently, the labor intensity is low, and a continuously moving production conveyor belt does not need to be stopped or interfered; the worker can do something else about 42 seconds between basket changes, including adding the additive bag to the newly removed turnover basket, so that the number of basket products reaches 100; the device can greatly improve labor productivity.
Example 4: the weighing and counting device, as shown in fig. 2, is the same as that of the embodiment 3, and is not described in detail, except that the stacking mechanism is a hopper with a hopper door 5 at the bottom, the hopper is located below a discharge hole of the production conveyor belt 1 and above the weighing platform 4, the opening and closing of the hopper door 5 are controlled by a weighing instrument, and the hopper door 5 can be opened and closed around a hinge 6. The weighing instrument cuts off scattered or piled products at irregular intervals on the continuous production conveyor belt for a period of time by opening and closing the hopper door 5, the scattered or piled products are divided into small piles with the number less than or equal to 16 and the average number equal to 12, and the small piles are loaded on the weighing platform 4 at one time.
Example 5: a weighing and counting device is shown in fig. 3, and is the same as that of the embodiment 3, and the weighing and counting device is not repeated, except that a stacking mechanism is a rotating wheel, the rotating wheel is positioned below a discharge hole of a production conveyor belt 1 and above a weighing platform 4, the rotating wheel is driven by a rotating wheel rotation driving device 11, a rotating shaft of the rotating wheel rotation driving device 11 is horizontally arranged, the rotating wheel is composed of n (6 is greater than or equal to n is greater than or equal to 2) smooth partition plates 7 which are uniformly arranged along the rotating circumference and are outwards radiated from the center of the rotating shaft, two ends of the rotating shaft are provided with baffle plates, products are prevented from falling out from two ends of the rotating shaft, and the action of the rotating wheel is controlled by a weighing instrument.
Example 6: as shown in fig. 4 and 5, the same features as those of the embodiment 3 are not repeated, and the difference is that the stacking mechanism is a turntable, the turntable is located below the discharge port of the production conveyor belt 1 and above the weighing platform 4, the turntable rotating shaft is perpendicular to the horizontal plane, the turntable is composed of a grating disc and a smooth supporting plate 10, the turntable driving device 9 drives the grating disc to rotate, the supporting plate 10 is fixed, the grating disc is composed of n gratings distributed at equal angles on the same circumference with the turntable rotating shaft as the center, the gratings are composed of an inner ring plate 13, a vertical grating plate 12 and an outer ring plate 8 which radiate outwards from the center of the turntable rotating shaft, the upper part and the lower part are transparent, the supporting plate 10 is provided with a gap corresponding to the grating and corresponding to the shape and the size of the weighing platform 4, the discharge port of the production conveyor belt 1 and the weighing platform 4 are staggered in the vertical direction, when the grating disc with products in the grating disc rotates to the gap position of the grating disc 10, the small stacks of products fall onto the weighing instrument at one time, and the action of the turntable is controlled by the weighing instrument.
Example 7: a weighing and counting device is shown in fig. 6, the same parts as those of the embodiment 3 are not repeated, the difference is that a weighing platform is positioned below a discharge hole of a stacking mechanism and consists of a weighing belt conveyor 15 and a weighing sensor 17 rigidly connected with the weighing belt conveyor 15, a feeding belt conveyor 14 is arranged on the left side of the weighing belt conveyor 15, a discharging belt conveyor 16 is arranged on the right side of the weighing belt conveyor 15, turnover material receiving frames with the same weight and shape are arranged on the feeding belt conveyor 16 and the weighing belt conveyor 15, the feeding belt conveyor 14, the weighing belt conveyor 15 and the discharging belt conveyor 16 are electrically connected with a weighing instrument, a product 2 to be weighed is poured into the turnover material receiving frame on the weighing belt conveyor 15, when N is larger than (P-D) =100-6=94, the weighing instrument sends a warning, meanwhile, the weighing instrument controls the feeding belt conveyor 14, the weighing belt conveyor 15 and the discharging belt conveyor 16 to move to the turnover material receiving frame to the right side synchronously, the turnover material receiving frame on the weighing belt conveyor 15 is provided with N turnover material receiving frames, the number of bags on the weighing belt conveyor 15 is equal to the total turnover material receiving frame, and the number of the turnover material receiving frames is equal to the total number of the total turnover material receiving frames is equal to the number of the total turnover material receiving frames, and the total turnover material is removed to the total number of the total turnover material is equal to the number of the total turnover material to P to the total weight of the total turnover material is transferred to the total weight and the total weight is equal to the number of the turnover material.
Claims (9)
1. The weighing and counting method is characterized by comprising a weighing device formed by a weighing platform and a weighing instrument, and a stacking mechanism arranged between a continuous production conveyor belt and the weighing platform, wherein the stacking mechanism is electrically connected with the weighing instrument and comprises the following steps of:
(1) Setting parameters on a weighing instrument: setting a target weight m of a single product; calculating a small pile weighing counting error upper limit SM of the number of products loaded on a weighing platform each time according to a deviation rate a of the weight of the single product on the production conveyor belt to a target weight m of the single product, wherein if 0.5/a is an integer, SM= (0.5/a) -1; if 0.5/a is not an integer, SM takes the integer part of 0.5/a; setting a target number P and a number difference D, wherein D is smaller than SM; determining the material receiving time t seconds for continuously collecting a small pile of products according to the average flow V/second, the peak flow Vp/second and the peak time tp seconds of standard products on the production conveyor belt, wherein t=SM/V+ (1-Vp/V) xtp;
(2) The weighing instrument marks the current total weight on the weighing platform as the total weight T before loading, and the total number N=0 on the weighing platform;
(3) The stacking mechanism continuously collects a small stack of products with the length of a material receiving time t less than or equal to SM from the production conveyor belt, the small stacks of products are moved to a weighing platform at one time, and the weighing instrument takes the stabilized weighing value as the current total weight G;
(4) Calculating (G-T)/M by a weighing instrument, rounding the number M= [ (G-T)/M ] of products in the loaded small stacks to an integer value, accumulating M into the total number N, namely, marking (N+M) as N, and outputting N;
(5) And (3) judging a weighing instrument: if the absolute value of N is more than or equal to (P-D), entering the step (6); otherwise, taking the current total weight G as the total weight T before loading of the next loading, namely T=G, and returning to the step (3);
(6) And the weighing instrument outputs an alarm instruction.
2. A weighing and counting method according to claim 1, characterized in that: adding the step (7): if the load is to be reloaded and the weighing is counted, returning to the step (2); otherwise, ending.
3. A weighing and counting device using the weighing and counting method according to claim 1, comprising a weighing platform and a weighing instrument electrically connected with the weighing platform, and further comprising a stacking mechanism electrically connected with the weighing instrument, wherein the stacking mechanism is arranged between a continuously running production conveyor belt and the weighing platform, and is used for carrying a plurality of products unloaded from the production conveyor belt within a certain time and conveying the carried products to the weighing platform under the control of the weighing instrument.
4. A weighing and counting device according to claim 3, characterized in that: the stacking mechanism is a belt conveyor or a chain plate conveyor, the outer surface of the belt or the chain plate of the belt conveyor or the chain plate conveyor is provided with equally-divided partition plates, the surface of the whole belt or the chain plate is divided into 2K sections, K is more than or equal to 2, each section forms a partition with two high ends and a low middle, K sections are arranged on the upper surface of the belt or the chain plate when the belt or the chain plate is stopped, and K sections are arranged on the lower surface of the belt or the chain plate.
5. A weighing and counting device according to claim 3, characterized in that: the stacking mechanism is a hopper with a hopper door at the bottom, the hopper is positioned below a discharge hole of the production conveyor belt and above the weighing platform, and the opening and closing of the hopper door are controlled by the weighing instrument.
6. A weighing and counting device according to claim 3, characterized in that: the split-stack mechanism is a rotating wheel, the rotating wheel is positioned below a discharge hole of the production conveyor belt and above the weighing platform, the rotating wheel is driven by a rotating wheel rotation driving device, a rotating shaft of the rotating wheel rotation driving device is horizontally arranged, the rotating wheel is composed of n smooth partition plates which are uniformly arranged along the rotation circumference at equal angles and radiate outwards from the center of the rotating shaft, n is more than or equal to 6, and the two ends of the rotating shaft are provided with baffle plates, and the action of the rotating wheel is controlled by a weighing instrument.
7. A weighing and counting device according to claim 3, characterized in that: the stacking mechanism is a turntable, the turntable is positioned below a discharge hole of the production conveyor belt and above a weighing platform, a rotating shaft of the turntable is vertical to a horizontal plane, the turntable consists of a grating disc and a smooth supporting plate, a turntable driving device drives the grating disc to rotate, the supporting plate is fixed, the grating disc consists of n gratings which are distributed at equal angles on the same circumference with the rotating shaft of the turntable as a circle center, the gratings consist of an inner ring plate, a vertical grating plate and an outer ring plate which radiate outwards from the center of the rotating shaft of the turntable, and are transparent up and down, or the gratings are tube pipes which are transparent up and down, the supporting plate is provided with a notch which corresponds to the gratings and corresponds to the shape and the size of the gratings at the position opposite to the weighing platform, the discharge hole of the production conveyor belt and the weighing platform are staggered in the vertical direction, one or more gratings are corresponding to the discharge hole of the production conveyor belt, when the gratings with products in the grating disc rotate to the notch of the supporting plate, small stacks of products fall onto the weighing platform at one time, and the action of the turntable is controlled by a weighing instrument.
8. A weighing-counting device according to claim 4 or 6 or 7, characterized in that: the stacking mechanism is driven by a stepping servo motor.
9. A weighing and counting device according to claim 3, characterized in that: the weighing platform is positioned below the discharge hole of the stacking mechanism and consists of a weighing belt conveyor and a weighing sensor which is rigidly connected with the weighing belt conveyor, a feeding belt conveyor is arranged on the left side of the weighing belt conveyor, a discharging belt conveyor is arranged on the right side of the weighing belt conveyor, and the feeding belt conveyor, the weighing belt conveyor and the discharging belt conveyor are all electrically connected with the weighing instrument.
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| CN109883529A (en) * | 2019-04-04 | 2019-06-14 | 杭州点微科技有限公司 | A kind of anti-fluttering method for access count of weighing |
| CN112141380B (en) * | 2020-10-01 | 2022-02-01 | 安徽省泗县瑞丰面粉有限公司 | Flour shaping is mixing device for packing |
| CN113658177B (en) * | 2021-09-10 | 2024-05-31 | 江苏蓝针智能科技有限公司 | Panel counting system based on image recognition |
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