A method for measuring the remaining amount of materials in a storage cabinet

Abstract

The present invention discloses a method for measuring the remaining amount of material in a storage cabinet, comprising: obtaining the actual pulse count of a motor from the start of material discharge to the current moment; determining the interval to which the current material discharge portion belongs; if the current material discharge portion is the head material segment, calculating the remaining amount of material in the storage cabinet based on a first remaining amount function and the actual pulse count; if the current material discharge portion is the middle material segment, calculating the remaining amount of material in the storage cabinet based on a second remaining amount function and the actual pulse count; if the current material discharge portion is the tail material segment, calculating the remaining amount of material in the storage cabinet based on a third remaining amount function and the actual pulse count. The present invention can effectively and accurately calculate the remaining amount of tobacco in the storage cabinet, thereby improving the accuracy of measuring the remaining amount of tobacco in the storage cabinet.

Description

Technical Field

[0001] The invention relates to the technical field of tobacco storage, in particular to a method for measuring the remaining amount of materials in a storage cabinet. Background Art

[0002] Storage cabinets are commonly used in the tobacco industry, primarily for storing cut tobacco and tobacco leaves, typically holding between 5,000 and 7,000 kg. A conveyor mechanism is installed at the bottom of the cabinet to transport the cut tobacco. During the discharge process, the main motor rotates, driving the conveyor mechanism to discharge the tobacco.

[0003] In actual production, the remaining amount of tobacco in the storage cabinet needs to be measured to meet production needs. Figure 1 As shown, a counter plate 4, which can be a metal plate, is mounted on the motor's output shaft. A proximity switch 5 detects the counter plate 4 to measure the motor's rotational speed and angle, thereby estimating the remaining tobacco in the storage cabinet. However, practical verification has shown that this method of measuring the remaining tobacco has a large error, resulting in inaccurate measurement. Summary of the Invention

[0004] The present invention aims to solve the problem of inaccurate measurement of the remaining amount of tobacco in a storage cabinet. The present invention provides a method for measuring the remaining amount of material in a storage cabinet, which can solve the above problem and thus improve the measurement accuracy of the remaining amount of tobacco in the storage cabinet.

[0005] In order to solve the above technical problems, the inventors explored and found that in the existing technology, the remaining amount of tobacco in the storage cabinet is estimated by detecting the counting piece by the proximity switch, which will result in large errors. The main reason is that due to the small number of counting pieces, the remaining amount cannot be effectively and accurately calculated during the metering process. At the same time, there is a situation where the counting piece is bent or broken, resulting in inaccurate measurement.

[0006] To solve the above technical problems, embodiments of the present invention disclose a method for measuring the remaining amount of material in a storage cabinet. A belt conveyor is provided at the bottom of the storage cabinet, and the belt conveyor is used to convey tobacco shreds. The belt conveyor is provided with a motor for driving the belt conveyor. When the storage cabinet is full, the material on the conveyor belt includes a tail section, an intermediate section, and a head section in the conveying direction. The method for measuring the remaining amount of material in the storage cabinet includes:

[0007] Get the actual number of pulses of the motor from the start of discharging to the current moment;

[0008] Determine the interval to which the current discharging part belongs;

[0009] If the current discharge section is the head section, the remaining amount of the material in the storage cabinet is calculated according to the first remaining amount function and the actual number of pulses;

[0010] If the current discharge section is the middle section, the remaining amount of the material in the storage cabinet is calculated based on the second remaining amount function and the actual number of pulses;

[0011] If the current discharging portion is the tailing section, the remaining amount of the material in the storage cabinet is calculated according to the third remaining amount function and the actual number of pulses.

[0012] By adopting the above technical solution, the actual number of pulses is obtained and the actual number of pulses is respectively brought into the first remaining quantity function, the first remaining quantity function and the first remaining quantity function to calculate the remaining quantity of the material in the storage cabinet when the material in each interval section in the storage cabinet is discharged; since the actual number of pulses can change continuously with the discharge of the material and the accuracy is high, the above technical solution can be used to effectively and accurately calculate the remaining quantity of tobacco in the storage cabinet, thereby improving the measurement accuracy of the remaining quantity of tobacco in the storage cabinet.

[0013] Optionally, it is characterized in that

[0014] The first residual function and the second residual function are both related to the number of head material pulses, the number of intermediate pulses, the total number of pulses and the total mass, and the third residual function is related to the number of tail material pulses, the number of intermediate pulses, the total number of pulses and the total mass.

[0015] Optionally, the construction method of each residual function includes:

[0016] Establishing a first relationship between the mass of the material in each interval and the length of the interval;

[0017] Establishing a second relationship between the number of pulses corresponding to each interval segment and the length of the interval segment;

[0018] Each residual function is constructed according to the first relational expression and the second relational expression.

[0019] Optionally, the first residual function is:

[0020]

[0021] Among them, T x is the remaining amount of material in the storage cabinet, T is the total mass, N x is the actual pulse number, N is the total pulse number, N1 is the head material pulse number, and N2 is the intermediate pulse number.

[0022] Optionally, the second residual function is:

[0023]

[0024] Among them, T x is the remaining amount of material in the storage cabinet, T is the total mass, N x is the actual pulse number, N is the total pulse number, N1 is the head material pulse number, and N2 is the intermediate pulse number.

[0025] Optionally, the third residual function is:

[0026]

[0027] Among them, T x is the remaining amount of material in the storage cabinet, T is the total mass, N x is the actual pulse number, N is the total pulse number, N2 is the intermediate pulse number, and N3 is the tail material pulse number.

[0028] Optionally, determining the interval to which the current discharge portion belongs includes:

[0029] Compare the actual pulse number with the pulse number of the first material, the middle pulse number and the pulse number of the tail material respectively;

[0030] If the actual pulse number is greater than 0 and less than or equal to the number of first material pulses, the current discharge section is the first material section;

[0031] If the actual pulse number is greater than the first material pulse number and less than or equal to the sum of the first material pulse number and the middle pulse number, the current discharge part is the middle section;

[0032] If the actual pulse number is greater than the sum of the head material pulse number and the middle pulse number, and is less than or equal to the total pulse number, the current discharge section is the tail material section.

[0033] Optionally, the method for obtaining the total pulse number, the first material pulse number, the intermediate pulse number, the tail material pulse number and the actual pulse number includes:

[0034] A rotary encoder is provided on the output shaft of the motor;

[0035] The number of pulses output by the rotary encoder from the start of material discharge to the end of material discharge is obtained as the total number of pulses;

[0036] The number of pulses output by the rotary encoder from the start of discharging the first material section to the end of discharging the first material section is obtained as the number of first material pulses;

[0037] The number of pulses output by the rotary encoder from the start of discharging the middle section to the end of discharging the middle section is obtained as the middle pulse number;

[0038] The number of pulses output by the rotary encoder from the start of discharging the tailing section to the end of discharging the tailing section is obtained as the tailing pulse number.

[0039] Optionally, the number of pulses per rotation of the rotary encoder is 1024. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A schematic diagram showing the structure of a metering mechanism in the background technology of the present invention is shown;

[0041] Figure 2 A cross-sectional view of a storage cabinet according to an embodiment of the present invention is shown;

[0042] Figure 3 A schematic diagram showing materials in a storage cabinet according to an embodiment of the present invention is shown;

[0043] Figure 4 Show Figure 3 Top view of the material in the drawing.

[0044] Figure markings: L. Total length of material; L1. Length of the head section; L2. Length of the middle section; L3. Length of the tail section; H. Material height; W. Material width; D. Pulley diameter; 1. Storage cabinet; 11. Discharge port; 2. Belt conveyor; 21. Pulley; 22. Conveyor belt; 3. Material; 31. Head section; 32. Middle section; 33. Tail section; 4. Counter plate; 5. Proximity switch. DETAILED DESCRIPTION

[0045] The following is an explanation of the embodiments of the present invention by specific specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this invention are limited to this embodiment. On the contrary, the purpose of introducing the invention in conjunction with the embodiment is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will contain many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0046] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0047] The terms "first", "second", "third", "fourth", "fifth", "sixth", etc. are only used to distinguish and describe, and should not be understood as indicating or implying relative importance.

[0048] In the description of this embodiment, it should be noted that, unless otherwise specified or limited, the terms "disposed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this embodiment based on specific circumstances.

[0049] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0050] The embodiment of the present invention discloses a method for measuring the remaining amount of materials in a storage cabinet. The structure of the storage cabinet 1 is as follows: Figure 2 As shown, a discharge port 11 is provided on the side wall of the storage cabinet 1, and a belt conveyor 2 is provided at the bottom of the storage cabinet 1. The belt conveyor 2 is used to convey the material, which may be tobacco, and discharge the material from the discharge port 11. The belt conveyor 2 includes: a motor, a pulley 21, and a conveyor belt 22. The output shaft of the motor is connected to the pulley 21, and the motor drives the conveyor belt 22 to run through the pulley 21. When the storage cabinet 1 is fully stored, the material 3 on the conveyor belt 22 is as shown in FIG. Figure 3 、 4 As shown, along the material conveying direction (such as Figure 2 The method for measuring the remaining amount of material in the storage cabinet includes:

[0051] Get the actual number of pulses N of the motor from the start of discharging to the current moment x ;

[0052] Determine the interval segment to which the current discharge portion belongs, that is, determine which segment of the head segment 31 , the middle segment 32 and the tail segment 33 the current discharge portion belongs to; wherein the current discharge portion is the portion of material currently being discharged from the discharge port 11 .

[0053] If the current discharge section is the head section 31, then according to the first remaining amount function and the actual pulse number N x Calculate the remaining amount of material in the storage cabinet T x ;

[0054] If the current discharge section is the middle section 32, then according to the second remaining amount function and the actual pulse number N x Calculate the remaining amount of material in the storage cabinet T x ;

[0055] If the current discharge section is the tail section 33, then according to the third remaining amount function and the actual pulse number N x Calculate the remaining amount of material in the storage cabinet Tx .

[0056] By adopting the above technical solution, the actual number of pulses N is obtained. x , and the actual number of pulses N x Substitute the first remaining quantity function, the first remaining quantity function and the first remaining quantity function respectively to calculate the remaining quantity T of the material in the storage cabinet when the material 3 in each interval section of the storage cabinet 1 is discharged. x ; Due to the actual number of pulses N x It can change continuously with the discharge of the material 3 and has high precision. Therefore, the above technical solution can effectively and accurately calculate the remaining amount of tobacco in the storage cabinet 1, thereby improving the measurement accuracy of the remaining amount of tobacco in the storage cabinet 1.

[0057] Furthermore, the first remaining quantity function and the second remaining quantity function are both related to the head material pulse number N1, the intermediate pulse number N2, the total pulse number N, and the total mass T, and the third remaining quantity function is related to the tail material pulse number N3, the intermediate pulse number N2, the total pulse number N, and the total mass T. The total pulse number N is the number of motor pulses required for the material 3 to be discharged from the discharge port 11 from the beginning to the complete discharge of the material 3 when the storage cabinet 1 is fully stocked; the head material pulse number N1 is the number of motor pulses required for the head material section 31 to be discharged from the discharge port 11 from the beginning to the complete discharge of the material 3; the intermediate pulse number N2 is the number of motor pulses required for the intermediate section 32 to be discharged from the discharge port 11 from the beginning to the complete discharge of the material 3; the tail material pulse number N3 is the number of motor pulses required for the tail material section 33 to be discharged from the discharge port 11 from the beginning to the complete discharge of the material 3; and the total mass T is the total mass of the material 3 in the storage cabinet 1 when the storage cabinet 1 is fully stocked.

[0058] Furthermore, the relationship between the total mass T and the mass of the material in each interval is:

[0059] T=T1+T2+T3

[0060] Wherein, T1 is the mass of the head material (ie, the mass of the head material section 31 ), T2 is the middle mass (ie, the mass of the middle section 32 ), and T3 is the mass of the tail material (ie, the mass of the tail material section 33 ).

[0061] The relationship between the total number of pulses N and the number of pulses in each interval is:

[0062] N=N1+N2+N3

[0063] Furthermore, the construction method of each residual function includes:

[0064] Establishing a first relationship between the mass of the material in each interval and the length of the interval;

[0065] Establishing a second relationship between the number of pulses corresponding to each interval segment and the length of the interval segment;

[0066] Each residual function is constructed according to the first relational expression and the second relational expression.

[0067] Specifically, the first relationship between the head material mass T1 and the head material segment length L1 is:

[0068]

[0069] Among them, T1 is the mass of the head material, L1 is the length of the head material section, H is the material height, W is the material width, and ρ is the material density.

[0070] The second relationship between the number of head material pulses N1 and the head material section length L1 is:

[0071]

[0072] Among them, N1 is the number of pulses of the head material, L1 is the length of the head material section, D is the pulley diameter, and n is the number of pulses per revolution of the rotary encoder.

[0073] When the current discharge part is located at the head material section 31, that is, 0<N x When ≤N1, the remaining amount of material in the storage cabinet is T x The total mass T minus the mass of the discharged portion of the head section 31, from which the first derivation formula can be generated:

[0074]

[0075] Substitute the first relationship between the head material mass T1 and the head material segment length L1, the second relationship between the head material pulse number N1 and the head material segment length L1, the relationship between the total mass T and the material mass of each interval segment, and the relationship between the total pulse number N and the pulse number of each interval segment into the first derivation formula to obtain the first residual function.

[0076] Specifically, the first relationship between the intermediate mass T2 and the intermediate segment length L2 is:

[0077]

[0078] Among them, T2 is the intermediate mass, L2 is the length of the middle section, H is the material height, W is the material width, and ρ is the material density.

[0079] The second relationship between the number of intermediate pulses N2 and the length of the intermediate segment L2 is:

[0080]

[0081] Among them, N2 is the number of intermediate pulses, L2 is the length of the intermediate segment, D is the pulley diameter, and n is the number of pulses per revolution of the rotary encoder.

[0082] When the current discharge part is located in the middle section 32, that is, N1<N x When ≤N1+N2, the remaining amount of material in the storage cabinet is T x The total mass T minus the mass of the head material T1 and the mass of the discharged portion of the middle section 32 , can generate the second derivation from this logical relationship, namely:

[0083]

[0084] Substitute the first relationship between the intermediate mass T2 and the intermediate segment length L2, the second relationship between the intermediate pulse number N2 and the intermediate segment length L2, the relationship between the total mass T and the material mass of each interval segment, and the relationship between the total pulse number N and the pulse number of each interval segment into the second derivation formula to obtain the second residual function.

[0085] Specifically, the first relationship between the tail mass T3 and the tail segment length L3 is:

[0086]

[0087] Among them, T3 is the tailing mass, L3 is the tailing section length, H is the material height, W is the material width, and ρ is the material density.

[0088] The second relationship between the tail material pulse number N3 and the tail material segment length L3 is:

[0089]

[0090] Among them, N3 is the number of tail material pulses, L3 is the length of the tail material section, D is the pulley diameter, and n is the number of pulses per revolution of the rotary encoder.

[0091] When the current discharge part is located at the tailing section 33, that is, N1+N2<N x When ≤N, the remaining amount of material in the storage cabinet is T x is the mass of the undischarged portion in the tailing section 33. Based on this logical relationship, the third derivation formula can be generated, namely:

[0092]

[0093] Substitute the first relationship between the tail material mass T3 and the tail material segment length L3, the second relationship between the tail material pulse number N3 and the tail material segment length L3, the relationship between the total mass T and the material mass of each interval segment, and the relationship between the total pulse number N and the pulse number of each interval segment into the first derivation formula to obtain the third residual function.

[0094] Furthermore, the first residual function is:

[0095]

[0096] Among them, T x is the remaining amount of material in the storage cabinet, T is the total mass, N x is the actual pulse number, N is the total pulse number, N1 is the head material pulse number, and N2 is the intermediate pulse number.

[0097] Furthermore, the second residual function is:

[0098]

[0099] Among them, T x is the remaining amount of material in the storage cabinet, T is the total mass, N x is the actual pulse number, N is the total pulse number, N1 is the head material pulse number, and N2 is the intermediate pulse number.

[0100] Furthermore, the third residual function is:

[0101]

[0102] Among them, T x is the remaining amount of material in the storage cabinet, T is the total mass, N x is the actual pulse number, N is the total pulse number, N2 is the intermediate pulse number, and N3 is the tail material pulse number.

[0103] Furthermore, the interval to which the current discharge portion belongs is determined to include:

[0104] The actual number of pulses N x Compare with the first material pulse number N1, the middle material pulse number N2 and the tail material pulse number N3 respectively;

[0105] If the actual number of pulses N x Greater than 0 and less than or equal to the number of pulses N1, that is, 0<N x ≤N1, then the current discharge section is the head material section 31;

[0106] If the actual number of pulses N x Greater than the number of pulses N1 for the first material and less than or equal to the sum of the number of pulses N1 for the first material and the number of intermediate pulses N2, that is, N1<N x ≤N1+N2, then the current discharge section is the middle section 32;

[0107] If the actual number of pulses N x Greater than the sum of the head pulse number N1 and the intermediate pulse number N2, and less than or equal to the total pulse number N, that is, N1+N2<N x ≤N, the current discharging section is the tail material section 33.

[0108] Furthermore, the total pulse number N, the head pulse number N1, the intermediate pulse number N2, the tail pulse number N3 and the actual pulse number N are obtained. xThe methods include:

[0109] A rotary encoder is provided on the output shaft of the motor;

[0110] Obtain the number of pulses output by the rotary encoder from the start of discharging of the head segment 31 (i.e., the start of discharging of the head segment 31 from the discharging port 11) to the completion of discharging of the tail segment 33 (i.e., the tail segment 33 is completely discharged from the discharging port 11) as the total number of pulses N;

[0111] Obtain the number of pulses output by the rotary encoder from the start of discharge of the first material segment 31 (i.e., the first material segment 31 begins to be discharged from the discharge port 11) to the completion of discharge of the first material segment 31 (i.e., the first material segment 31 is completely discharged from the discharge port 11) as the first material pulse number N1;

[0112] The number of pulses output by the rotary encoder from the start of discharging of the middle section 32 (i.e., the middle section 32 starts to be discharged from the discharge port 11) to the completion of discharging of the middle section 32 (i.e., the middle section 32 is completely discharged from the discharge port 11) is obtained as the intermediate pulse number N2;

[0113] The number of pulses output by the rotary encoder from the start of discharging of the tail segment 33 (i.e., the tail segment 33 starts to be discharged from the discharge port 11) to the completion of discharging of the tail segment 33 (i.e., the tail segment 33 is completely discharged from the discharge port 11) is obtained as the tail pulse number N3.

[0114] Furthermore, the number n of pulses per revolution of the rotary encoder is 1024.

[0115] Although the present invention has been illustrated and described with reference to certain preferred embodiments thereof, it should be understood by those skilled in the art that the above description is provided as a further detailed description of the present invention in conjunction with specific embodiments thereof, and that the specific implementation of the present invention is not limited to these descriptions. Those skilled in the art may make various changes in form and details, including simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A method for measuring the remaining amount of material in a storage cabinet, wherein a belt conveyor is provided at the bottom of the storage cabinet, the belt conveyor is used to convey tobacco shreds, and the belt conveyor is provided with a motor for driving the belt conveyor; when the storage cabinet is full, the material on the conveyor belt includes a tail section, a middle section, and a head section in the conveying direction, characterized in that: The measurement method includes: Get the actual number of pulses of the motor from the start of discharging to the current moment; Determine the interval to which the current discharging part belongs; If the current discharge portion is the head material section, the remaining amount of the material in the storage cabinet is calculated according to the first remaining amount function and the actual number of pulses; If the current discharge portion is the middle section, the remaining amount of the material in the storage cabinet is calculated according to the second remaining amount function and the actual number of pulses; If the current discharge portion is the tailing section, the remaining amount of the material in the storage cabinet is calculated according to the third remaining amount function and the actual number of pulses; The first remaining amount function and the second remaining amount function are both related to the number of first material pulses, the number of intermediate pulses, the total number of pulses and the total mass, and the third remaining amount function is related to the number of tail material pulses, the number of intermediate pulses, the total number of pulses and the total mass; The construction methods of each residual function include: Establishing a first relationship between the mass of the material in each of the intervals and the length of the interval; Establishing a second relationship between the number of pulses corresponding to each of the intervals and the length of the interval; constructing each of the residual functions according to the first relational expression and the second relational expression; The first residual function is: Among them, T x is the remaining amount of material in the storage cabinet, T is the total mass, N x is the actual pulse number, N is the total pulse number, N1 is the head material pulse number, and N2 is the intermediate pulse number; The second residual function is: Among them, T x is the remaining amount of material in the storage cabinet, T is the total mass, N x is the actual pulse number, N is the total pulse number, N1 is the head material pulse number, and N2 is the intermediate pulse number; The third residual function is: Among them, T x is the remaining amount of material in the storage cabinet, T is the total mass, N x is the actual pulse number, N is the total pulse number, N2 is the intermediate pulse number, and N3 is the tail material pulse number.

2. The method for measuring the remaining amount of material in a storage cabinet according to claim 1, characterized in that: The determination of the interval to which the current discharge portion belongs includes: Comparing the actual pulse number with the first material pulse number, the middle material pulse number and the tail material pulse number respectively; If the actual pulse number is greater than 0 and less than or equal to the first material pulse number, the current discharge portion is the first material section; If the actual pulse number is greater than the first material pulse number and less than or equal to the sum of the first material pulse number and the middle pulse number, the current discharge portion is the middle section; If the actual pulse number is greater than the sum of the head material pulse number and the intermediate pulse number, and is less than or equal to the total pulse number, the current discharge portion is the tail material section.

3. The method for measuring the remaining amount of material in a storage cabinet according to claim 1, characterized in that: The method for obtaining the total pulse number, the head pulse number, the intermediate pulse number, the tail pulse number, and the actual pulse number includes: A rotary encoder is provided on the output shaft of the motor; Obtaining the number of pulses output by the rotary encoder from the start of discharging of the head section to the completion of discharging of the tail section as the total number of pulses; Obtaining the number of pulses output by the rotary encoder from the start of discharging of the head material section to the completion of discharging of the head material section as the head material pulse number; Obtaining the number of pulses output by the rotary encoder from the start of discharging the intermediate section to the completion of discharging the intermediate section as the intermediate pulse number; The number of pulses output by the rotary encoder from the start of discharging of the tailing section to the completion of discharging of the tailing section is obtained as the tailing pulse number.

4. The method for measuring the remaining amount of material in a storage cabinet according to claim 3, characterized in that: The number of pulses per revolution of the rotary encoder is 1024.

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