Method for rapidly measuring volume of irregular object

Abstract

The invention relates to a method for rapidly measuring the volume of an irregular object, in particular to a method for rapidly measuring the volume of a large number of stacked irregular objects. The core idea is that a container is filled with gas and then is hermetically connected with one end of a precise U-shaped graduated tube vertical to the ground, a proper amount of liquid is filled in the U-shaped graduated tube, and the other end of the U-shaped tube is communicated with outside air. After the same volume of containers with different volumes is compressed, the quantitative relation between the difference of the measuring range numerical values of the liquid level of the liquid on the side, communicated with the air, of the U-shaped pipe, which is pushed by the volume change after the gas in the container is compressed, and the same volume of the compression container is derived, so that the volume of the irregular objects stacked in the container with the fixed volume can be quickly measured. Compared with a traditional method for measuring the volume of the irregular object, the method is easy to operate, the measurement precision can meet different requirements, the volume measurement time is shortened, a new means is added for volume measurement, and the method can be widely applied to volume measurement of social production transaction.

Description

Technical Field

[0001] The present invention relates to a method for quickly measuring the volume of irregular objects, especially a method for quickly measuring the volume of a large number of irregular objects piled up. Technical Background

[0002] In many practical applications, it is necessary to quickly and accurately measure the volume of objects with irregular shapes. For example, quickly and accurately measuring the volume of the earthwork transported by trucks during construction site excavation, and quickly and accurately measuring the volume of a large number of transported parcels in the express delivery and logistics industry. Currently, laser scanning volume measurement technology is commonly used to measure volume, and this technology has the following three disadvantages: First, there may be occluded areas for objects with complex shapes, requiring multi-angle scanning, and sometimes it is even impossible to completely cover; second, some depressions or internal structures may exceed the effective measurement range of the laser; transparent or semi-transparent materials may cause measurement errors or data loss; porous materials such as foams or fabrics are difficult to accurately scan; third, black or dark objects absorb most of the laser, resulting in weak signals and reduced scanning quality. To overcome the inherent defects of the laser signal of the laser scanning volumeter, such as being occluded by complex shapes and requiring multi-angle scanning, being unable to effectively measure depressions or internal structures, and being absorbed by black or dark objects, the present invention provides a volume measurement method using gas as the measurement medium. Summary of the Invention

[0003] By taking advantage of the fact that after irregularly piled objects are placed in a container with a fixed volume, the gas can quickly cover the surfaces of objects with complex shapes, depressions or internal structures under normal atmospheric pressure, and then indirectly measuring the volume occupied by the gas in the container, the quick and accurate measurement of the volume of the irregular objects piled up in the container is completed.

[0004] The core idea of the present invention is as follows:

[0005] Under the same ambient temperature and the same atmospheric pressure, after filling open containers with different volumes with gas, one end of a precise U-shaped graduated tube perpendicular to the ground is sealed and connected. An appropriate amount of liquid is filled in the U-shaped graduated tube and the liquid levels are all at the same starting scale, and the other end of the U-shaped tube is communicated with the outside air.

[0006] The ideal gas law in physics is PV = nRT, where P represents the pressure of the gas, V represents the volume of the gas, n represents the amount of substance of the gas, R represents the gas constant, and T represents the absolute temperature of the gas.

[0007] When reducing the same volume of these containers with different volumes, it is equivalent to applying the same pressure to the gas in these containers with different volumes in addition to the atmospheric pressure. The ranges of the liquid levels rising on the side of the U-shaped tube that is communicated with the air and is sealed and connected to the gas are different.

[0008] According to the derivation of the ideal gas law, when the amount of substance n, temperature T, and gas constant R of the gas remain unchanged, as the pressure of the gas increases, its volume decreases. After applying the same pressure, the larger the volume of the container, the greater the degree of compression of the gas volume inside the container; conversely, for containers with smaller volumes, when the same volume reduction occurs, the degree of compression of the gas volume inside the container is smaller. Under the condition that the liquid levels in the U-shaped tubes sealed to the containers are at the same starting scale level, after applying the same pressure to the gas in containers with larger volumes, the range of the liquid level rise on the side of the U-shaped tube connected to the air that is pushed by the gas is smaller; conversely, after applying the same pressure to the gas in containers with smaller volumes, the range of the liquid level rise on the side of the U-shaped tube connected to the air that is pushed by the gas is larger.

[0009] Therefore, it is only necessary to derive the quantitative relationship between the difference in the range of the liquid level rise and the same volume of the compressed container. Then, based on the range of the liquid level rise of the same liquid and the same starting scale of the liquid level in the U-shaped tube pushed by the gas in a container with a known volume after packing irregular items and compressing the same volume, the volume of the irregular items packed in the container with a known volume can be quickly calculated. The measurement error is related to the size of the same volume being compressed. The smaller the same volume being compressed, the lower the measurement error.

[0010] Technical solution

[0011] In the same temperature environment and the same atmospheric pressure, different-volume containers are filled with gas and then sealed to one end of a precise U-shaped scale tube perpendicular to the ground. An appropriate amount of liquid is filled in the U-shaped scale tube, and the other end of the U-shaped tube is connected to the outside air.

[0012] Step 1:

[0013] Using the above method, ensure that the liquid levels in the U-shaped tubes connected to containers with volumes of basic volume, 2 times the basic volume, 3 times the basic volume, and a fixed-volume container containing irregular items of unknown volume are at the same starting scale value.

[0014] Step 2:

[0015] Measure the range values of the liquid levels of the same amount of liquid in the U-shaped tubes sealed to the four groups of containers after compressing the basic volume, and record the range values as A, B, C, and X respectively.

[0016] Step 3:

[0017] When the measurement accuracy of the container, the U-shaped tube, the volume of the liquid filled, and the connecting pipeline are exactly the same, according to the derivation of the ideal gas law, the range value A is the largest, the range value B is in the middle, and the range value C is the smallest, and the difference between A and B is the same as the difference between B and C. However, affected by the measurement accuracy of the instrument pipeline and the liquid, the difference between A and B is infinitely close to the difference between B and C; within the acceptable error range, it is regarded that the difference in the liquid level scale values in the U-shaped tube sealed and connected after compressing the basic volume of the container with the difference in the two volumes as the basic volume is the same, named Z.

[0018] After calculation, the volume of the unknown volume item is:

[0019] The beneficial effects of the present invention are:

[0020] The present invention is a measurement method based on the principle that the volume of the gas in a compressed container changes when it is pressurized, and realizes the volume measurement of irregular items stacked in a container with a known volume. Compared with the traditional measurement methods for the volume of irregular items, the method of the present invention is simple to operate, the measurement accuracy can meet different requirements, reduces the volume measurement time, adds a new means for volume measurement, and can be widely applied to the volume measurement in social production and transactions. Description of the Drawings

[0021] Figure 1 It is a schematic structural diagram of a method for quickly measuring the volume of irregular items according to the present invention. For easy understanding of the present invention, the container is drawn in the shape of a syringe in this figure, and the shape of the container can be determined according to application requirements. Detailed Embodiments

[0022] The following embodiments further illustrate the content of the present invention, but should not be construed as a limitation of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0023] Unless otherwise specified, the technical means used in the embodiments are conventional means well known to those skilled in the art.

[0024] Step 1: Manufacture a measuring device suitable for measuring the size of the item

[0025] A measuring device is combined by using at least four containers filled with air and respectively sealingly connected to one end of a precise U-shaped scale tube perpendicular to the ground, and the other end of the U-shaped tube is communicated with the outside air. The specifications, sizes and measurement accuracies of the components connected to the containers and the U-shaped tube should be the same, and the measuring device should meet the airtightness requirements under normal atmospheric pressure.

[0026] A control component that can be opened and closed for sealing is installed above the tube body on the side where the U-shaped tube is connected to the container. This control component should meet the airtightness requirements under normal atmospheric pressure. An appropriate amount of water or liquid is filled into the U-shaped tube to a measurable scale. The accuracy of the scale of the U-shaped tube should be adapted to the application scenario according to the measurement error requirements.

[0027] The size and shape of the measuring device are determined according to the needs of the application scenario, but there must be at least four containers, and the shape of the containers is determined according to the needs of the application scenario. Three containers are used for comparison and calculation, and one container is used to measure the volume of the item. The volumes of the three containers for comparison and calculation are the basic volume, 2 times the basic volume, and 3 times the basic volume respectively. In order to meet the measurement accuracy and application scenario requirements, more containers for comparison and calculation can be installed. For each additional container for comparison and calculation, its volume increases by 1 times the basic volume. The volume of the container for measuring the volume of the item should be fixed and known, and its size is determined according to the needs of the application scenario for measuring irregularly stacked items. The basic volume is determined according to the application scenario, and the basic volume is closely related to the measurement error.

[0028] The measuring device is equipped with an automatic compression device that can control the reduction and restoration of the container volume. The automatic compression device is determined according to the application scenario. It is necessary to ensure that the accuracy of the automatic compression device for reducing the container volume is adapted to the application scenario, and the airtightness requirements should be ensured when reducing the container volume. The automatic compression device should ensure that the sizes of the basic volumes of all containers are reduced simultaneously.

[0029] The liquid filling amount in each U-shaped tube should be the same, and the filling amount is based on the standard that the liquid does not leak after compressing the basic volumes of all containers and the liquid level in the U-shaped tube can be read.

[0030] Step 2: Measure and calculate the volume of the item

[0031] After the item to be measured is loaded into the container for measuring the volume of the item and sealed, ensure that the liquid levels in the U-shaped tubes connected to each group of containers are at the same starting scale value, then close the sealing control component of the U-shaped tube, and use the automatic compression device to reduce the size of the basic volume of each container.

[0032] After reducing the basic volumes of the containers with volumes of the basic volume, 2 times the basic volume, and 3 times the basic volume respectively, record the liquid level values on the side of the U-shaped tube connected to the air, and name them A, B, and C respectively.

[0033] After reducing the basic volume of the container for measuring the volume of the item with the unknown volume item, record the liquid level value on the side of the U-shaped tube connected to the air, and name it X.

[0034] The average value of the differences in the liquid level scale values after reducing the basic volumes of the comparison and calculation containers with the difference in volume of the basic volume between two by two is named Z.

[0035] There are more than 3 containers used for comparison calculations. Calculate the average value of the differences in the liquid level scales after reducing the base volume of the containers whose difference in the volumes of any two comparison - used containers is the base volume, and name it Z.

[0036] After calculation, the volume of the item with unknown volume is:

[0037] The above - described embodiments only represent one implementation mode of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

1. A method for quickly measuring the volume of irregular objects, characterized in that: By loading irregular objects into fixed-volume containers; and using three containers of base volume, 2 times base volume, and 3 times base volume as comparison containers; to increase measurement accuracy, additional comparison containers can be added. If there are more than 3 comparison containers, the volume of each additional comparison container increases by 1 times the base volume; these containers are filled with gas and sealed to one end of a precise U-shaped graduated tube perpendicular to the ground, a proper amount of liquid is filled in the U-shaped graduated tube, and the liquid level is at the same starting scale, and the other end of the U-shaped tube is connected to the outside air; compression After comparing the basic volume of the container, the range values ​​of the liquid level rise pushed by the gas in the U-shaped tube sealed with the container are recorded, and the quantitative relationship between the range difference of the liquid level rise and the compressed basic volume is derived; then, after compressing the basic volume in a fixed-volume container, the gas in the container pushes the same amount of liquid level rise in a U-shaped tube sealed with the container. By comparing the quantitative relationship between the range difference of the liquid level rise in the container and the compressed basic volume, the volume of irregular objects stacked in the fixed-volume container can be calculated.

2. The method according to claim 1, characterized in that : The volume occupied by the gas in the container is indirectly measured to quickly and accurately measure the volume of irregular objects piled in the container.

3. The method according to claim 1, characterized in that Use gases and liquids as measuring media.

4. The method according to claim 1, characterized in that The capacity of a container is measured by applying pressure to the gas in the container to change its volume.

5. The method according to claim 1, characterized in that The change in the volume of the gas in the container is reflected by the change in the liquid level in the U-tube sealed with the container.

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