Method for improving material weight display accuracy of packing machine

Abstract

The invention relates to the technical field of production equipment in the mine industry, in particular to a method for improving the material weight display accuracy of a packing machine, a mathematical model conforming to reality is established, and the actual stress condition of a ton bag is subjected to geometric analysis through a coordinate method, so that the accuracy of the material weight finally displayed and output by the packing machine is greatly improved. According to the system, the working efficiency can be guaranteed, meanwhile, it is guaranteed that the difference between the total weight recorded by workers in the warehouse and the weight needing to be delivered by the batch of materials meets the quality control precision requirement to the maximum extent in secondary rechecking, and the consistency of warehouse material taking and material delivery is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of production equipment in the mining industry, and in particular to a method for improving the display accuracy of material weight of a baler. Background Art

[0002] Mining is a heavy industry field, and the weight of the ore is relatively large. When taking the material from the warehouse, in order to improve work efficiency and ensure accurate material delivery, a baler (such as Figure 2 The staff controls the unloading process by connecting the four lifting rings of the ton bag to the four hooks of the baler (as shown in the figure). Figure 3 The ton bag is fixedly connected in a way as shown in the figure, so that the opening of the ton bag faces upwards and is directly opposite the discharge port of the baler. After the ton bag is installed, the discharge port of the baler starts to discharge the material. After the material to be transported this time has completely entered the ton bag, the baler display will display the weight of the ton bag at this time according to the data output by the weighing module installed on the hook. The staff will record the weight of each ton bag after it is filled with materials one by one, and finally get the total weight of the batch of materials. However, in the subsequent production or sales process, weighing equipment with higher measurement accuracy is often used to spot check the weight of the entire batch of materials to ensure that the weight of the delivered materials meets the requirements. In the actual spot check process, it was found that the total weight recorded by the staff was too different from the weight to be delivered, which did not meet the quality control accuracy requirements (within 3‰).

[0003] How to ensure work efficiency while ensuring, in the secondary review, that the difference between the total weight recorded by the staff in the warehouse and the weight of the batch of materials that need to be delivered meets the quality control accuracy requirements, so as to improve the consistency between warehouse material collection and material delivery, has always been an urgent problem to be solved by technical personnel in this field. Summary of the invention

[0004] The purpose of the present invention is to provide a method for improving the accuracy of material weight display of a baler in view of the corresponding deficiencies of the prior art, to establish a mathematical model that conforms to reality, to perform geometric analysis on the actual force conditions of ton bags through the coordinate method, so that the accuracy of the material weight finally displayed and output by the baler is greatly improved, and while ensuring work efficiency, in the secondary review, it can maximize the guarantee that the difference between the total weight recorded by the staff in the warehouse and the weight of the batch of materials to be delivered meets the quality control accuracy requirements, thereby greatly improving the consistency between warehouse material collection and material delivery.

[0005] The objective of the present invention is achieved by adopting the following scheme:

[0006] A method for improving the display accuracy of material weight of a baler comprises the following steps:

[0007] 1) The first plane is made through the four hook force points of the baler, and the fourth plane is made through the center of gravity of the ton bag. The first plane and the fourth plane are parallel to the ground. Calculate the distance between the first plane and the fourth plane;

[0008] 2) After the baler stops unloading, record the original weighing data output by the weighing modules corresponding to the four hooks, and use the coordinate method to perform mechanical analysis on the stress of the ton bag. According to the distance between the first plane and the fourth plane, calculate the coordinates of the projection point of the center of gravity of the ton bag in the first plane;

[0009] 3) Calculate the distance between the coordinates of the projection point of the center of gravity of the ton bag in the first plane and the force points of each hook;

[0010] 4) According to the distance between the coordinates of the projection point of the center of gravity of the ton bag in the first plane and the force points of each hook, calculate the vertical downward pulling force on each hook force point;

[0011] 5) Add the vertical downward pulling forces on each hook force point calculated in step 4) to obtain the calculated weight value of the ton bag, and output the calculated weight value of the ton bag as the actual weight of the ton bag.

[0012] Preferably, in step 1), the distance between the first plane and the fourth plane is calculated according to the following formula:

[0013]

[0014] In the formula, H is the distance between the first plane and the fourth plane, 2R is the length of the diagonal of the first plane, that is, the distance between the first hook and the third hook, or the distance between the second hook and the fourth hook, B is the side length of the ton bag, P is the length of the ton bag body, and L is the straight-line distance between the hook force point and the first plane.

[0015] Preferably, in step 2), after the baler stops unloading, the original weighing data output by the weighing modules corresponding to the four hooks are recorded, and the force condition of the ton bag is mechanically analyzed using the coordinate method. According to the distance between the first plane and the fourth plane, the specific method for calculating the coordinates of the projection point of the center of gravity of the ton bag in the first plane is as follows:

[0016] 2-1) Assume that the four hooks of the baler are the first hook, the second hook, the third hook, and the fourth hook, and connect the top end points of the four hooks of the baler with lines in sequence to form a first plane, and the first plane is a square. Assume that the distance between the force points of each hook of the baler and the center of the first plane is R;

[0017] 2-2) establishing a first coordinate system on the first plane, wherein the origin of the first coordinate system is the center of the first plane;

[0018] 2-3) respectively make a second plane and a third plane perpendicular to the ground through the two diagonals of the top plane of the hook, then establish a second coordinate system on the second plane, and establish a third coordinate system on the third plane, the horizontal axis of the second coordinate system is the first diagonal corresponding to the first hook and the third hook, the vertical axis of the second coordinate system is the straight line passing through the center of the first plane and perpendicular to the ground, the horizontal axis of the third coordinate system is the second diagonal corresponding to the second hook and the fourth hook, and the vertical axis of the third coordinate system is the straight line passing through the center of the first plane and perpendicular to the ground;

[0019] 2-4) Decompose the gravity of the ton bag into the first gravity component and the second gravity component. The first gravity component is located in the second plane, and the second gravity component is located in the third plane. The force point of the first gravity component on the ton bag is the first force point X. 1-3 , the first stress point X 1-3 The projection point on the first plane is x 13 The point where the second gravity is applied on the ton bag is the second force point X 2-4 , the second force point X 2-4 The projection point on the first plane is x 24 , the first hook force point and the projection point x 13 The distance between the second hook force point and the projection point x is R1. 24 The distance between the third hook force point and the projection point x is R2. 13 The distance between the fourth hook force point and the projection point x is R3. 24 The distance is R4;

[0020] 2-5) After the baler stops unloading, the original weighing data output by the weighing modules corresponding to the four hooks and the distance H between the first plane and the fourth plane are obtained, wherein the original weighing data includes the first original weighing data G1 corresponding to the first hook, the second original weighing data G2 corresponding to the second hook, the third original weighing data G3 corresponding to the third hook, and the fourth original weighing data G4 corresponding to the fourth hook;

[0021] 2-6) Use the coordinate method to conduct a mechanical analysis of the stress on the ton bag, and calculate the stress point of the first hook and the projection point x according to the following formula 13 The distance R1 between the force point of the second hook and the projection point x 24 The distance R2 between the force point of the third hook and the projection point x 13 The distance R3 between the fourth hook force point and the projection point x 24 Distance R4:

[0022]

[0023] R1+R3=2R

[0024]

[0025] R2+R4=2R

[0026] In the formula, R1 is the distance between the first hook force point and the projection point x 13 R2 is the distance between the force point of the second hook and the projection point x 24 R3 is the distance between the force point of the third hook and the projection point x 13 R4 is the distance between the fourth hook force point and the projection point x 24 , H is the distance between the first plane and the fourth plane, G1 is the first original weighing data corresponding to the first hook, G2 is the second original weighing data corresponding to the second hook, G3 is the third original weighing data corresponding to the third hook, G4 is the fourth original weighing data corresponding to the fourth hook, and R is the distance between the force point of the first, second, third, or fourth hook of the baler and the center of the first plane;

[0027] 2-7) According to the first hook force point and the projection point x 13 The distance R1 between the force point of the second hook and the projection point x 24 The distance R2 between the force point of the third hook and the projection point x 13 The distance R3 between the fourth hook force point and the projection point x 24 The distance R4 is obtained by respectively obtaining the projection point x 13 , projection point x 24 Position coordinates in the first coordinate system;

[0028] 2-8) Project the point x 13 , projection point x 24 The midpoint of the connecting line in the first coordinate system is used as the projection point x of the center of gravity of the ton bag in the first plane, and the coordinates of the projection point x in the first coordinate system are used as the coordinates of the projection point of the center of gravity of the ton bag in the first plane.

[0029] Preferably, the distances between the coordinates of the projection point of the center of gravity of the ton bag in the first plane and the force points of each hook are obtained based on the coordinates of the projection position of the center of gravity of the ton bag in the first coordinate system and the distance formula between the two points.

[0030] Preferably, the vertical downward pulling force on each hook force point is calculated in the same way, as follows:

[0031] 4-1) A fifth plane is made through the projection point of the gravity center of the ton bag in the first plane, the force point of the hook, and the gravity center of the ton bag, and a fifth coordinate system is established in the fifth plane. The projection point of the gravity center of the ton bag in the first plane is used as the origin of the fifth coordinate system. The projection point of the gravity center of the ton bag in the first plane and the force point of the hook are used to determine the horizontal axis of the fifth coordinate system, and the projection point of the gravity center of the ton bag in the first plane and the gravity center of the ton bag are used to determine the vertical axis of the fifth coordinate system;

[0032] 4-2) In the fifth coordinate system, calculate the vertical downward pulling force on the center of gravity of the ton bag at the hook force point according to the following formula:

[0033]

[0034] In the formula, G mm is the vertical downward pulling force on the mth hook force point, G m is the original weighing data corresponding to the mth hook, H is the distance between the first plane and the fourth plane, R m It is the distance between the projection point of the center of gravity of the ton bag in the first plane and the force point of the hook.

[0035] Preferably, the calculation formula for the ton bag gravity calculation value is as follows:

[0036] G 计算 =G 11 +G 22 +G 33 +G 44

[0037] In the formula, G 计算 is the calculated value of the ton bag gravity, G 11 is the vertical downward pulling force on the first hook force point, G 22 is the vertical downward pulling force on the force point of the second hook, G 33 is the vertical downward pulling force on the third hook force point, G 44 It is the vertical downward pulling force received by the fourth hook force point.

[0038] The beneficial effects of the present invention are as follows:

[0039] ① The mathematical model established by the present invention is in line with reality, and the coordinate method used is used to perform geometric analysis on the actual stress conditions of the ton bag. The idea is clear, and the weight of the material finally displayed by the baler is highly accurate;

[0040] ② The present invention can ensure work efficiency while ensuring that the difference between the total weight recorded by the staff in the warehouse and the weight of the batch of materials to be delivered meets the quality control accuracy requirements (within 3‰) in the secondary review, greatly improving the consistency between warehouse material collection and material delivery.

[0041] Glossary

[0042] Weighing module: a weight sensor, also known as a weighing sensor, is a device that can convert the weight signal of an object into a measurable electrical signal. The weighing module referred to in this invention refers to the weight sensor installed above the four hooks of the baler. With these weight sensors, the forces on the four lifting rings of the ton bag can be obtained respectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 is a flow chart of the present invention;

[0044] Figure 2 It is a schematic diagram of a baler of the present invention;

[0045] Figure 3 It is a schematic diagram of four hooks of the baler of the present invention;

[0046] Figure 4 A schematic diagram of calculating the distance between the first plane and the fourth plane in an embodiment of the present invention;

[0047] Figure 5 This is a schematic diagram of a ton bag filled with materials in an embodiment of the present invention;

[0048] Figure 6 Schematic diagram of the relationship between the fifth plane and the ton bag in the embodiment of the present invention;

[0049] Figure 7 is a schematic diagram of the first plane in an embodiment of the present invention; wherein g1, g2, g3, and g4 are all hook force points;

[0050] Figure 8 is a schematic diagram of a second plane in an embodiment of the present invention;

[0051] Fig. 9 is a schematic diagram of a third plane in an embodiment of the present invention;

[0052] Fig.10 This is a schematic diagram of mechanical analysis of the stress condition of a ton bag on the first plane using the coordinate method in step 2-6) of an embodiment of the present invention;

[0053] Fig.11 This is a schematic diagram of mechanical analysis of the stress condition of a ton bag on the first plane using the coordinate method in step 2-6) of an embodiment of the present invention;

[0054] Fig.12 This is a schematic diagram of mechanical analysis of the stress condition of a ton bag using the coordinate method on the first plane in step 2-6) of an embodiment of the present invention. DETAILED DESCRIPTION

[0055] like Figures 1 to 12 As shown, a method for improving the accuracy of material weight display of a baler comprises the following steps:

[0056] 1) The first plane is made through the four hook force points of the baler, and the fourth plane is made through the center of gravity of the ton bag, and the first plane and the fourth plane are parallel to the ground. The distance between the first plane and the fourth plane is calculated. In this embodiment, the distance between the first plane and the fourth plane is calculated according to the following formula:

[0057]

[0058] In the formula, H is the distance between the first plane and the fourth plane, 2R is the length of the diagonal of the first plane, that is, the distance between the first hook and the third hook, or the distance between the second hook and the fourth hook, which is a known fixed value. B is the side length of the ton bag, P is the length of the ton bag body, and L is the straight-line distance between the hook force point and the first plane. That is to say, in this embodiment, after the ton bag is filled with materials, it can actually be regarded as a cuboid with a height of P, a length and a width of B (that is, the cross-section of the cuboid is a square). The material only exists in this cuboid, and there is no material in the cylinder with a radius of D and a height of T.

[0059] 2) After the baler stops unloading, record the original weighing data output by the weighing modules corresponding to the four hooks, and use the coordinate method to perform a mechanical analysis on the stress condition of the ton bag. According to the distance between the first plane and the fourth plane, and by establishing a coordinate system in each plane, calculate the coordinates of the projection point of the center of gravity of the ton bag in the first plane. In this embodiment, the steps for calculating the coordinates of the projection point of the center of gravity of the ton bag in the first plane are: 2-1) Suppose the four hooks of the baler are the first hook, the second hook, the third hook, and the fourth hook, respectively. Connect the top end points of the four hooks of the baler with lines in sequence to form a first plane, and the first plane is a square. Suppose the distance between the force points of each hook of the baler and the center of the first plane is R. Specifically, the distance R between the force points of each hook of the baler and the center of the first plane is a known fixed value.

[0060] 2-2) Establish a first coordinate system on the first plane, where the origin of the first coordinate system is the center of the first plane.

[0061] 2-3) respectively make a second plane and a third plane perpendicular to the ground through the two diagonals of the top plane of the hook, then establish a second coordinate system on the second plane, and establish a third coordinate system on the third plane, the horizontal axis of the second coordinate system is the first diagonal corresponding to the first hook and the third hook, the vertical axis of the second coordinate system is the straight line passing through the center of the first plane and perpendicular to the ground, the horizontal axis of the third coordinate system is the second diagonal corresponding to the second hook and the fourth hook, and the vertical axis of the third coordinate system is the straight line passing through the first plane and perpendicular to the ground;

[0062] 2-4) Decompose the gravity of the ton bag into the first gravity component and the second gravity component. The first gravity component is located in the second plane, and the second gravity component is located in the third plane. The force point of the first gravity component on the ton bag is the first force point X. 1-3 , the first stress point X 1-3 The projection point on the first plane is x 13 The point where the second gravity is applied on the ton bag is the second force point X 2-4 , the second force point X 2-4 The projection point on the first plane is x 24 , the first hook force point and the projection point x 13 The distance between the second hook force point and the projection point x is R1. 24 The distance between the third hook force point and the projection point x is R2. 13 The distance between the fourth hook force point and the projection point x is R3. 24 The distance is R4;

[0063] 2-5) After the baler stops unloading, the original weighing data output by the weighing modules corresponding to the four hooks and the distance H between the first plane and the fourth plane are obtained, wherein the original weighing data includes the first original weighing data G1 corresponding to the first hook, the second original weighing data G2 corresponding to the second hook, the third original weighing data G3 corresponding to the third hook, and the fourth original weighing data G4 corresponding to the fourth hook;

[0064] 2-6) Use the coordinate method to conduct a mechanical analysis of the stress on the ton bag, and calculate the stress point of the first hook and the projection point x according to the following formula 13 The distance R1 between the force point of the second hook and the projection point x 24 The distance R2 between the force point of the third hook and the projection point x 13 The distance R3 between the fourth hook force point and the projection point x 24 Distance R4:

[0065]

[0066] R1+R3=2R

[0067]

[0068] R2+R4=2R

[0069] In the formula, R1 is the distance between the first hook force point and the projection point x 13 R2 is the distance between the force point of the second hook and the projection point x 24 R3 is the distance between the force point of the third hook and the projection point x 13 R4 is the distance between the fourth hook force point and the projection point x 24, H is the distance between the first plane and the fourth plane, G1 is the first original weighing data corresponding to the first hook, G2 is the second original weighing data corresponding to the second hook, G3 is the third original weighing data corresponding to the third hook, G4 is the fourth original weighing data corresponding to the fourth hook, and R is the distance between the force point of the first, second, third, or fourth hook of the baler and the center of the first plane;

[0070] 2-7) According to the first hook force point and the projection point x 13 The distance R1 between the force point of the second hook and the projection point x 24 The distance R2 between the force point of the third hook and the projection point x 13 The distance R3 between the fourth hook force point and the projection point x 24 The distance R4 is obtained by respectively obtaining the projection point x 13 , projection point x 24 Position coordinates in the first coordinate system;

[0071] 2-8) Project the point x 13 , projection point x 24 The midpoint of the connecting line in the first coordinate system is used as the projection point x of the center of gravity of the ton bag in the first plane, and the coordinates of the projection point x in the first coordinate system are used as the coordinates of the projection point of the center of gravity of the ton bag in the first plane.

[0072] 3) Calculate the distance between the coordinates of the projection point of the center of gravity of the ton bag in the first plane and the force points of each hook;

[0073] The distance between the projection point coordinates of the center of gravity of the ton bag in the first plane and the force points of each hook is obtained according to the projection position coordinates of the center of gravity of the ton bag in the first coordinate system and the distance formula between the two points. In this embodiment, taking the distance between the projection point coordinates of the center of gravity of the ton bag in the first plane and the force point of the first hook as an example, the steps are as follows:

[0074] 3-1) Obtain the coordinates A (x1, y1) of the projection point of the center of gravity of the ton bag in the first plane, and the coordinates B (x2, y2) of the force point of the first hook;

[0075] 3-2) Substitute the two coordinate points A and B obtained into the following formula to obtain the distance between the coordinates of the projection point of the center of gravity of the ton bag in the first plane and the force point of the first hook:

[0076]

[0077] In the formula, R 11 It is the distance between the coordinates of the projection point of the center of gravity of the ton bag in the first plane and the force point of the first hook.

[0078] Similarly, the distances R between the coordinates of the projection point of the center of gravity of the ton bag in the first plane and the force points of the second hook, the third hook, and the fourth hook can be obtained respectively. 22 , R 33 , R 44 .

[0079] 4) According to the distance between the coordinates of the projection point of the center of gravity of the ton bag in the first plane and the force points of each hook, calculate the vertical downward pulling force on each hook force point. In fact, the sum of these vertical downward pulling forces is the real gravity of the ton bag. The original weighing data of the baler only uses the forces on the four hooks to calculate the weight of the ton bag, without considering various factors that can affect the calculation of the actual gravity of the ton bag. For example, the original weighing data of the baler does not exclude the horizontal pulling force on the hook force point, and includes these horizontal pulling forces in the calculation, which is bound to cause calculation errors of the real weight of the ton bag.

[0080] In this embodiment, the vertical downward pulling force on each hook force point is calculated in the following specific steps:

[0081] 4-1) Make a fifth plane through the projection point x of the center of gravity of the ton bag in the first plane, the force point of the hook, and the center of gravity of the ton bag, and establish a fifth coordinate system in the fifth plane. The fifth coordinate system takes the projection point of the center of gravity of the ton bag in the first plane as the origin, and uses the projection point of the center of gravity of the ton bag in the first plane and the force point of the hook to determine the horizontal axis of the fifth coordinate system, and uses the projection point of the center of gravity of the ton bag in the first plane and the center of gravity of the ton bag to determine the vertical axis of the fifth coordinate system;

[0082] 4-2) In the fifth coordinate system, calculate the vertical component of the center of gravity of the ton bag at the hook force point according to the following formula:

[0083]

[0084] In the formula, G mm is the vertical downward pulling force on the mth hook force point, G m is the original weighing data corresponding to the mth hook, H is the distance between the first plane and the fourth plane, R m It is the distance between the projection point of the center of gravity of the ton bag in the first plane and the force point of the hook.

[0085] In this embodiment, the vertical downward pulling force G on the first hook force point is calculated. 11 For example, the first original weighing data G1 corresponding to the first hook obtained in step 2), the distance R between the projection point coordinates of the center of gravity of the ton bag in the first plane and the force point of the first hook obtained in step 3) 11 Substituting the above formula, we can calculate the vertical component vector G of the first hook force point: 11 :

[0086]

[0087] Similarly, the vertical downward pulling force G on the force point of the second hook can be calculated 22 , the vertical downward pulling force G on the third hook force point 33 , the vertical downward pulling force G on the fourth hook force point 44 .

[0088] 5) Add the vertical downward pulling forces on each hook force point calculated in step 4) to obtain the calculated weight value of the ton bag, and output the calculated weight value of the ton bag as the actual weight of the ton bag in the baler material weight display box to facilitate the staff to see the actual weight of the ton bag material.

[0089] In this embodiment, the calculation formula of the ton bag gravity calculation value is as follows:

[0090] G 计算 =G 11 +G 22 +G 33 +G 44

[0091] In the formula, G 计算 is the calculated value of the ton bag gravity, G 11 is the vertical downward pulling force on the first hook force point, G 22 is the vertical downward pulling force on the force point of the second hook, G 33 is the vertical downward pulling force on the third hook force point, G 44 It is the vertical downward pulling force received by the fourth hook force point.

[0092] Often, the original weighing data output by the baler weighing module can be either mass or weight. When these data are used in calculations, they can be converted according to conventional mass and weight conversion formulas.

[0093] In order to further eliminate calculation errors and improve calculation accuracy, the calculation accuracy of the distance between the first plane and the fourth plane is very important. Obviously, using the formula to calculate the distance between the first plane and the fourth plane once, and then using the calculated data to calculate the weight of the ton bag (including materials), it is easy to produce errors (for example, under the action of gravity, the lower half of the material must be more than the upper half, and the center of gravity must be lower). Therefore, the distance between the first plane and the fourth plane can be calibrated and corrected in advance through experiments.

[0094] In this embodiment, based on the distance between the first plane and the fourth plane calculated once, the value of the distance is gradually increased according to the unit step length (for example, the unit step length in Table 1 is 1 mm), and then the corrected distance (i.e., the distance between the first plane and the fourth plane) is obtained. Then, the corresponding calculated weights at different distances are calculated by formulas. For example, in Table 1, the data records obtained by repeated calculations for 200 times are as follows:

[0095] Table 1

[0096]

[0097] In Table 1, H is the distance between the first plane and the fourth plane calculated for the first time, M1 is the weight of the ton bag calculated according to the method described in this embodiment after adding 1 mm to the distance between the first plane and the fourth plane calculated for the first time, and m1 is the weight of the ton bag weighed by a high-precision scale in a static state, that is, the weight of the ton bag is the result with the smallest error after excluding the weighing error as much as possible.

[0098] After obtaining the data in Table 1 above, select the distance corresponding to the time when the calculated theoretical weight is closest to the static precise weighing value as the correction distance between the first plane and the fourth plane. Using this correction distance in the calculation can greatly improve the calculation accuracy of the final ton bag weight.

[0099] In other words, the final correction distance is obtained by combining calculation and experimental data. In the same scenario, after the installation and commissioning of the on-site equipment is completed, the parameter R, as well as the weight of the pre-loaded materials in each bag and other data will not change; and the capacity of the ton bag is constant, and the data such as B, P, and L will not change. Only the distance between the first plane and the fourth plane has the greatest impact on the error of the calculation result. Therefore, the accurate distance between the first plane and the fourth plane should be calculated first by the above method, and then the subsequent calculations should be performed to maximize the calculation accuracy of the final result.

[0100] Comparative experiments have shown that the total weight of the materials obtained according to the data output on the display of the traditional baler is about 3.9‰ compared with the weight of the batch of materials that need to be delivered. After adopting the present invention, the total weight of the materials obtained according to the output data of the baler display is about 2.4‰ compared with the weight of the batch of materials that need to be delivered. It can be seen that the accuracy of the material weight finally displayed and output by the baler using the present invention is extremely high. While ensuring work efficiency, it can maximize the total weight recorded by the staff in the warehouse in the secondary review, and the difference between the weight of the batch of materials that need to be delivered meets the quality control accuracy requirements (within 3‰), greatly improving the consistency of warehouse material collection and material delivery.

[0101] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification made to the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope of the present invention.

Claims

1. A method for improving the accuracy of material weight display of a baler, characterized in that: The following steps are involved: 1) The first plane is made through the four hook force points of the baler, and the fourth plane is made through the center of gravity of the ton bag. The first plane and the fourth plane are parallel to the ground. Calculate the distance between the first plane and the fourth plane; 2) After the baler stops unloading, record the original weighing data output by the weighing modules corresponding to the four hooks, and use the coordinate method to perform mechanical analysis on the stress of the ton bag. According to the distance between the first plane and the fourth plane, calculate the coordinates of the projection point of the center of gravity of the ton bag in the first plane; 3) Calculate the distance between the coordinates of the projection point of the center of gravity of the ton bag in the first plane and the force points of each hook; 4) According to the distance between the coordinates of the projection point of the center of gravity of the ton bag in the first plane and the force points of each hook, calculate the vertical downward pulling force on each hook force point; 5) Add up the various pulling forces calculated in step 4) to obtain a calculated value of the ton bag's gravity, and output the calculated value of the ton bag's gravity as the actual weight of the ton bag.

2. The method for improving the display accuracy of material weight of a baler according to claim 1, characterized in that: In step 1), the distance between the first plane and the fourth plane is calculated according to the following formula: In the formula, H is the distance between the first plane and the fourth plane, 2R is the length of the diagonal of the first plane, B is the side length of the ton bag, P is the length of the ton bag body, and L is the straight-line distance between the hook force point and the first plane.

3. The method for improving the display accuracy of material weight of a baler according to claim 1, characterized in that: In step 2), after the baler stops unloading, the original weighing data output by the weighing modules corresponding to the four hooks are recorded, and the force condition of the ton bag is mechanically analyzed using the coordinate method. According to the distance between the first plane and the fourth plane, the specific method of calculating the coordinates of the projection point of the center of gravity of the ton bag in the first plane includes: 2-1) Assume that the four hooks of the baler are the first hook, the second hook, the third hook, and the fourth hook, and connect the top end points of the four hooks of the baler with lines in sequence to form a first plane, and the first plane is a square. Assume that the distance between the force points of each hook of the baler and the center of the first plane is R; 2-2) establishing a first coordinate system on the first plane, wherein the origin of the first coordinate system is the center of the first plane; 2-3) respectively make a second plane and a third plane perpendicular to the ground through the two diagonals of the top plane of the hook, then establish a second coordinate system on the second plane, and establish a third coordinate system on the third plane, the horizontal axis of the second coordinate system is the first diagonal corresponding to the first hook and the third hook, the vertical axis of the second coordinate system is the straight line passing through the center of the first plane and perpendicular to the ground, the horizontal axis of the third coordinate system is the second diagonal corresponding to the second hook and the fourth hook, and the vertical axis of the third coordinate system is the straight line passing through the center of the first plane and perpendicular to the ground; 2-4) Decompose the gravity of the ton bag into the first gravity component and the second gravity component. The first gravity component is located in the second plane, and the second gravity component is located in the third plane. The force point of the first gravity component on the ton bag is the first force point X. 1-3 , the first stress point X 1-3 The projection point on the first plane is x 13 The point where the second gravity is applied on the ton bag is the second force point X 2-4 , the second force point X 2-4 The projection point on the first plane is x 24 , the first hook force point and the projection point x 13 The distance between the second hook force point and the projection point x is R1. 24 The distance between the force point of the third hook and the projection point x is R2. 13 The distance between the fourth hook force point and the projection point x is R3. 24 The distance is R4; 2-5) After the baler stops unloading, the original weighing data output by the weighing modules corresponding to the four hooks and the distance H between the first plane and the fourth plane are obtained, wherein the original weighing data includes the first original weighing data G1 corresponding to the first hook, the second original weighing data G2 corresponding to the second hook, the third original weighing data G3 corresponding to the third hook, and the fourth original weighing data G4 corresponding to the fourth hook; 2-6) Use the coordinate method to conduct a mechanical analysis of the stress on the ton bag, and calculate the stress point of the first hook and the projection point x according to the following formula 13 The distance R1 between the force point of the second hook and the projection point x 24 The distance R2 between the force point of the third hook and the projection point x 13 The distance R3 between the fourth hook force point and the projection point x 24 Distance R4: R1+R3=2R R2+R4=2R In the formula, R1 is the distance between the first hook force point and the projection point x 13 R2 is the distance between the force point of the second hook and the projection point x 24 R3 is the distance between the force point of the third hook and the projection point x 13 R4 is the distance between the fourth hook force point and the projection point x 24 , H is the distance between the first plane and the fourth plane, G1 is the first original weighing data corresponding to the first hook, G2 is the second original weighing data corresponding to the second hook, G3 is the third original weighing data corresponding to the third hook, G4 is the fourth original weighing data corresponding to the fourth hook, and R is the distance between the force point of the first, second, third, or fourth hook of the baler and the center of the first plane; 2-7) According to the first hook force point and the projection point x 13 The distance R1 between the force point of the second hook and the projection point x 24 The distance R2 between the force point of the third hook and the projection point x 13 The distance R3 between the fourth hook force point and the projection point x 24 The distance R4 is obtained by respectively obtaining the projection point x 13 , projection point x 24 Position coordinates in the first coordinate system; 2-8) Project the point x 13 , projection point x 24 The midpoint of the connecting line in the first coordinate system is used as the projection point x of the center of gravity of the ton bag in the first plane, and the coordinates of the projection point x in the first coordinate system are used as the coordinates of the projection point of the center of gravity of the ton bag in the first plane.

4. The method for improving the display accuracy of material weight of a baler according to claim 1, characterized in that: In step 3), the distances between the coordinates of the projection point of the center of gravity of the ton bag in the first plane and the force points of each hook are obtained based on the coordinates of the projection position of the center of gravity of the ton bag in the first coordinate system and the distance formula between the two points.

5. The method for improving the display accuracy of material weight of a baler according to claim 1, characterized in that: In step 4), the vertical downward pulling force on each hook force point is calculated in the same way, as follows: 4-1) A fifth plane is made through the projection point of the gravity center of the ton bag in the first plane, the force point of the hook, and the gravity center of the ton bag, and a fifth coordinate system is established in the fifth plane. The projection point of the gravity center of the ton bag in the first plane is used as the origin of the fifth coordinate system. The projection point of the gravity center of the ton bag in the first plane and the force point of the hook are used to determine the horizontal axis of the fifth coordinate system, and the projection point of the gravity center of the ton bag in the first plane and the gravity center of the ton bag are used to determine the vertical axis of the fifth coordinate system; 4-2) In the fifth coordinate system, calculate the vertical downward pulling force on the center of gravity of the ton bag at the hook force point according to the following formula: In the formula, G mm is the vertical downward pulling force on the mth hook force point, G m is the original weighing data corresponding to the hook, H is the distance between the first plane and the fourth plane, R m It is the distance between the projection point of the center of gravity of the ton bag in the first plane and the force point of the hook.

6. The method for improving the display accuracy of material weight of a baler according to claim 1, characterized in that: In step 5), the calculation formula of the ton bag gravity calculation value is as follows: G 计算 =G 11 +G 22 +G 33 +G 44 In the formula, G 计算 is the calculated value of the ton bag gravity, G 11 is the vertical downward pulling force on the first hook force point, G 22 is the vertical downward pulling force on the force point of the second hook, G 33 is the vertical downward pulling force on the hook force point, G 44 It is the vertical downward pulling force received by the fourth hook force point.

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