A metering system and metering method for particulate materials

Abstract

The present application discloses a metering system and a metering method for granular materials, relating to the technical field of oil and gas field development, to solve the problem of inaccurate metering of granular materials. The metering system includes: a tank body and a metering conveyor belt device; the tank body includes a discharging part, the metering conveyor belt device includes a metering conveyor belt, and the metering conveyor belt is arranged to face the discharging part so that the granular materials from the discharging part can fall onto the metering conveyor belt; wherein, there is a material accommodating groove with a fixed shape at the position on the metering conveyor belt corresponding to the discharging part. The present application is used for metering granular materials.

Description

Technical Field

[0001] This application relates to the technical field of oil and gas field development, and particularly to a metering system and method for particulate materials. Background Art

[0002] The development of oil and gas fields includes fracturing operations. The general process of fracturing operations is as follows: after the formation is fractured, a liquid is injected, and a certain proportion of particulate materials (such as quartz sand) are mixed into the liquid. The liquid and the quartz sand enter the formation fractures together and remain in the fractures permanently. Since the quartz sand is several times denser than the formation, it can support the formation fractures to keep them open and improve the oil flow environment. In fracturing operations, there is a need to measure the sand output per unit time (such as the volume of supplied quartz sand).

[0003] Taking the particulate material as quartz sand as an example, in the related art, the weight of the conveyed quartz sand can be measured by a metering belt with a belt scale, and the conveying amount of the quartz sand can be calculated. However, this method is greatly affected by vibrations during the operation of the belt, and there is a problem of inaccurate metering of particulate materials. Summary of the Invention

[0004] The purpose of the embodiments of this application is to provide a metering system and method to solve the problem of inaccurate metering of particulate materials.

[0005] In a first aspect, the embodiments of this application provide a metering system, including: a tank body and a metering conveyor belt device; the tank body includes a discharging part, and the metering conveyor belt device includes a metering conveyor belt, and the metering conveyor belt is arranged to face the discharging part, so that the particulate materials from the discharging part can fall onto the metering conveyor belt;

[0006] Wherein, there is a material receiving groove with a fixed shape at the position on the metering conveyor belt corresponding to the discharging part.

[0007] Optionally, in the metering system provided by the embodiments of this application, the metering conveyor belt is a deformable metering conveyor belt,

[0008] The deformable metering conveyor belt deforms when carrying the particulate materials from the discharging part to form the material receiving groove.

[0009] Optionally, in the metering system provided by the embodiments of this application, the metering system further includes a guide roller, and the installation position of the guide roller corresponds to the discharging part; the structure of the material receiving groove is defined by the guide roller.

[0010] Optionally, in the metering system provided by the embodiments of the present application, the guide roller includes a support roller disposed in the width direction of the metering conveyor belt and shaping rollers located on both sides of the support roller; both the support roller and the shaping rollers are within the coverage range of the particulate material discharged from the discharge section.

[0011] Optionally, in the metering system provided by the embodiments of the present application, one support roller corresponds to two shaping rollers; the number of the support rollers is at least one, and the number of the shaping rollers is at least two; the at least one support roller and the at least two shaping rollers are both located in a target area close to the inner surface of the metering conveyor belt, and the target area is the vertical projection area of the discharge section on the metering conveyor belt.

[0012] Optionally, in the metering system provided by the embodiments of the present application, the support roller is of a concave structure or a linear structure, and the shaping roller is of an L-shaped structure or a linear structure.

[0013] Optionally, in the metering system provided by the embodiments of the present application, the support roller is a telescopic support roller.

[0014] Optionally, in the metering system provided by the embodiments of the present application, the discharge section is arranged to cooperate with the material receiving groove so that the amount of material carried by the material receiving groove remains constant.

[0015] Optionally, in the metering system provided by the embodiments of the present application, the height of the bottom of the discharge section is less than or equal to the height of the top of the material receiving groove, and the outer side wall of the discharge section abuts against the inner side wall of the material receiving groove.

[0016] Optionally, in the metering system provided by the embodiments of the present application, the discharge section is of a cylindrical structure or a cuboid structure, the bottom of the discharge section is flush with the top of the material receiving groove, and the outer diameter or side length of the discharge section is equal to the width of the top of the material receiving groove.

[0017] Optionally, in the metering system provided by the embodiments of the present application, the discharge section is of a cylindrical structure or a cuboid structure, at least a part of the discharge section extends to a target position within the material receiving groove, and the outer diameter or side length of the discharge section is equal to the width of the material receiving groove at the target position.

[0018] Optionally, in the metering system provided by the embodiments of the present application, the discharging part includes a first discharging part and a second discharging part. The first discharging part is connected to the second discharging part. The first discharging part has a circular cross-section, and the second discharging part has an elliptical cross-section. The cross-sectional area of the first discharging part is equal to the cross-sectional area of the second discharging part. The distance between the second discharging part and the material receiving groove is less than the distance between the first discharging part and the material receiving groove. The height of the bottom of the second discharging part is less than or equal to the height of the top of the material receiving groove, and the outer side wall of the second discharging part abuts against the inner side wall of the material receiving groove.

[0019] Optionally, in the metering system provided by the embodiments of the present application, the cross-section of the material receiving groove is U-shaped, square or trapezoidal.

[0020] Optionally, in the metering system provided by the embodiments of the present application, the discharging part is a telescopic discharging part. The telescopic discharging part includes a first discharging part and a second discharging part. The second discharging part is embedded in the first discharging part, and the second discharging part is telescopic in a direction perpendicular to the metering conveyor belt.

[0021] Optionally, in the metering system provided by the embodiments of the present application, the discharging part includes a first discharging part and a second discharging part. The first discharging part is connected to the second discharging part, and the distance between the second discharging part and the material receiving groove is less than the distance between the first discharging part and the material receiving groove. The second discharging part is a replaceable discharging part.

[0022] In a second aspect, a metering method provided by the embodiments of the present application is applied to any one of the metering systems in the first aspect. The metering method includes:

[0023] Obtain the speed of the metering conveyor belt;

[0024] Obtain the height between the discharging part and the metering conveyor belt;

[0025] Based on the height between the discharging part and the metering conveyor belt, obtain the cross-sectional area of the first target structure formed by the granular material accumulated between the material receiving groove and the discharging part;

[0026] Based on the speed of the metering conveyor belt and the cross-sectional area of the first target structure, obtain the volume of the granular material per unit time.

[0027] Optionally, when the guiding roller includes a supporting roller arranged in the width direction of the metering conveyor belt and shaping rollers located on both sides of the supporting roller, the obtaining the height between the discharging part and the metering conveyor belt includes:

[0028] Obtain the distance between the discharging part and the supporting roller, and the thickness of the metering conveyor belt;

[0029] Subtract the thickness of the metering conveyor belt from the distance between the discharging part and the supporting roller to obtain the height between the discharging part and the metering conveyor belt;

[0030] Correspondingly, the obtaining of the cross-sectional area of the first target structure formed by the granular material accumulated between the material receiving groove and the discharging part based on the height between the discharging part and the metering conveyor belt includes:

[0031] Obtain the distance between the two shaping rollers on both sides of the supporting roller;

[0032] Based on the distance between the two shaping rollers and the height between the discharging part and the metering conveyor belt, obtain the cross-sectional area of the first target structure formed by the granular material accumulated between the material receiving groove and the discharging part.

[0033] Optionally, the discharging part is a telescopic discharging part, and the metering method further includes:

[0034] When the discharging part is a telescopic discharging part and it is necessary to adjust the volume of the granular material per unit time, adjust the height between the telescopic discharging part and the metering conveyor belt by the telescopic movement of the telescopic discharging part;

[0035] Obtain the adjusted height between the telescopic discharging part and the metering conveyor belt;

[0036] Based on the adjusted height between the telescopic discharging part and the metering conveyor belt, obtain the cross-sectional area of the second target structure formed by the granular material accumulated between the material receiving groove and the adjusted telescopic discharging part;

[0037] Based on the speed of the metering conveyor belt and the cross-sectional area of the second target structure, obtain the volume of the granular material per unit time.

[0038] The embodiments of the present application can achieve the following beneficial effects: The metering system provided by the embodiments of the present application includes: a tank body and a metering conveyor belt device; the tank body includes a discharging part, the metering conveyor belt device includes a metering conveyor belt, and the metering conveyor belt is arranged to face the discharging part so that the granular material from the discharging part can fall onto the metering conveyor belt; wherein, there is a material receiving groove with a fixed shape at the position corresponding to the discharging part on the metering conveyor belt. In this way, the granular material stored in the tank body flows out from the discharging part and falls into the material receiving groove with a fixed shape on the metering conveyor belt. Since the shape of the material receiving groove is fixed and the cross-sectional shape of the granular material in the material receiving groove is also known, the cross-sectional area of the shape formed by the granular material in the material receiving groove on the metering conveyor belt can be accurately obtained. Furthermore, in combination with the known conveyor belt speed, the amount of the granular material can be accurately measured. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The schematic embodiments and descriptions thereof of the present application are used to explain the present application and do not constitute an improper limitation to the present application. In the drawings:

[0040] Figure 1-2 is a schematic structural diagram of a metering system provided by an embodiment of the present application;

[0041] Figure 3 is a schematic structural diagram of another metering system provided by an embodiment of the present application;

[0042] FIG. 4(a) is a schematic structural diagram of another metering system provided by an embodiment of the present application;

[0043] FIG. 4(b) is a schematic structural diagram of another metering system provided by an embodiment of the present application;

[0044] FIG. 5(a) is a schematic structural diagram of another metering system provided by an embodiment of the present application;

[0045] FIGS. 5(b)-5(c) are schematic structural diagrams of another metering system provided by an embodiment of the present application;

[0046] Figure 6 is a schematic structural diagram of another metering system provided by an embodiment of the present application;

[0047] Figure 7 is a schematic structural diagram of another metering system provided by an embodiment of the present application;

[0048] Figure 8 is a schematic structural diagram of a fracturing supply system in an actual application provided by an embodiment of the present application;

[0049] Figure 9 Schematic flowchart of a metering method provided by an embodiment of the present application;

[0050] Description of reference numerals: 10 - tank body; 20 - metering conveyor device; 30 - guide roller; 40 - base bracket; 50 - second conveyor device; 60 - sand mixing equipment; 100 - main container; 110 - extended container; 120 - discharge valve; 130 - discharge part; 131 - first discharge part; 132 - second discharge part; 200 - metering conveyor; 201 - material receiving groove; 301 - support roller; 302 - shaping roller; particulate material a in the material receiving groove. Detailed implementation manners

[0051] To make the objectives, technical solutions, and advantages of the present application clearer, the technical solutions of the present application will be clearly described below in conjunction with specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present application.

[0052] The terms "first" and "second" in the description and claims of the present application may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise specified, the meaning of "a plurality" is two or more. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / " generally means an "or" relationship between the associated objects before and after.

[0053] In the description of the present application, it should be noted that, unless otherwise clearly defined and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0054] To solve the problem of inaccurate metering of particulate materials, a metering system provided by the present application.

[0055] Generally speaking, taking the supply of particulate materials (such as quartz sand) in oil and gas field fracturing operations as an example for illustration, as Figure 8As shown in the figure, the metering system provided by the embodiment of the present application may include a tank body 10 and a metering conveyor belt device 20. In addition, other supporting equipment (such as a second conveyor belt device 50 and a sand mixing device 60) may also be included in the supply of particulate materials during the fracturing operation. When supplying particulate materials during the fracturing operation in an oil and gas field, the particulate materials are usually stored in the tank body 10, and the tank body 10 has a discharging part. The particulate materials from the discharging part can fall into the material receiving grooves with a fixed shape on the metering conveyor belt of the metering conveyor belt device 20; the particulate materials on the metering conveyor belt can enter the hopper of the sand mixing device 60 via the second conveyor belt device 50; in the hopper of the sand mixing device 60, the particulate materials are mixed with a certain proportion of liquid and then injected into the formation fracture through a fracturing pump device to support the formation fracture in an open state and improve the oil flow environment.

[0056] Among them, the metering conveyor belt is an important component of the present application. When supplying particulate materials during the fracturing operation, the accurate metering of the particulate materials falling on the metering conveyor belt can be achieved by using the metering conveyor belt.

[0057] The following will Figure 1-7 specifically describe the metering system provided by the embodiment of the present application in conjunction with the attached

[0058] Figure 1-2 is a schematic structural diagram of a metering system provided by an embodiment of the present application.

[0059] As Figure 1 shown, the metering system provided by the embodiment of the present application may include: a tank body 10 and a metering conveyor belt device 20; the tank body 10 includes a discharging part 130, and the metering conveyor belt device 20 includes a metering conveyor belt 200. The metering conveyor belt 200 is arranged to face the discharging part 130 so that the particulate materials from the discharging part 130 can fall into the metering conveyor belt 200;

[0060] Among them, as Figure 2 shown, there are material receiving grooves 201 with a fixed shape at the position on the metering conveyor belt 200 corresponding to the discharging part 130. Among them, the fixed shape of the material receiving grooves 201 means that after the particulate materials fall into the material receiving grooves 201, the shape of the material receiving grooves 201 no longer changes.

[0061] In the embodiment of the present application, the tank body is a storage tank for storing particulate materials. The stored particulate materials can be solid particulate materials, and the solid particulate materials can be sand, grain particles, etc. Of course, the solid particulate materials can also include other particles, and the present application does not limit this.

[0062] In the embodiment of the present application, the metering conveyor belt device 20 can be used for conveying granular materials. For the convenience of understanding, taking the metering conveyor belt device 20 as a belt conveyor as an example, the metering conveyor belt device 20 may at least include a head roller, a tail roller, and a metering conveyor belt 200. Under the action of the friction force between the metering conveyor belt and the head and tail rollers, the metering conveyor belt can run cyclically, and the granular materials on the metering conveyor belt move along with the conveyor belt. Of course, the metering conveyor belt device 20 may also include other structures. For example, a motor for controlling the rotation of the roller, or a speed measuring sensor for measuring the running speed of the metering conveyor belt, etc. The embodiment of the present application does not make specific limitations on this, and the specific structure of the metering conveyor belt device 20 does not affect the implementation of the solution of the present application.

[0063] In the embodiment of the present application, the metering conveyor belt 200 is arranged to face the discharging part 130. Specifically, it may include that the metering conveyor belt 200 is arranged directly below the discharging part 130, so that the granular materials from the discharging part 130 can fall into the metering conveyor belt 200.

[0064] In the embodiment of the present application, the shape of the material receiving groove 201 is fixed. The granular materials fall from the discharging part 130 of the tank body 10 into the metering conveyor belt 200. Since there is a material receiving groove 201 with a fixed shape at the position corresponding to the discharging part 130 on the metering conveyor belt 200, the granular materials can fall into the material receiving groove 201 with a fixed shape. In this way, the cross-sectional shape of the granular materials in the material receiving groove 201 is similar to the cross-sectional shape of the material receiving groove 201, that is, the cross-sectional shape of the granular materials in the material receiving groove 201 is also known. In this way, before the granular materials fall onto the metering conveyor belt, the cross-sectional shape of the granular materials falling into the material receiving groove 201 can be pre-judged according to the cross-sectional shape of the material receiving groove 201, so as to accurately obtain the cross-sectional area of the granular materials in the material receiving groove 201.

[0065] Among them, the shape of the material receiving groove 201 being fixed may include that the shape of the cross-section of the material receiving groove 201 is fixed; the cross-section of the material receiving groove 201 refers to a plane perpendicular to the length direction of the metering conveyor belt 200. Correspondingly, the cross-section of the granular materials in the material receiving groove 201 refers to a plane perpendicular to the length direction of the metering conveyor belt 200. In this way, after the granular materials fall into the material receiving groove 201, the shape of the cross-section of the material receiving groove 201 perpendicular to the length direction of the metering conveyor belt 200 no longer changes. Correspondingly, the shape of the cross-section of the granular materials in the material receiving groove 201 perpendicular to the length direction of the metering conveyor belt 200 no longer changes.

[0066] A metering system provided by an embodiment of the present application. Since the particulate material from the tank can fall into the material receiving groove 201 with a fixed shape on the metering conveyor belt, thus, the area of the cross-section of the particulate material in the material receiving groove 201 can be accurately obtained. Furthermore, by combining the cross-sectional area of the particulate material with the known speed of the metering conveyor belt, the volume of the particulate material per unit time can be calculated.

[0067] Among them, the speed of the metering conveyor belt can be determined by a speed measuring sensor, or by the specific working mode of the motor in the metering conveyor belt device. Of course, it can also be determined by other means, and the present application does not make specific limitations.

[0068] It can be understood that there can be different implementation manners for forming the material receiving groove 201 with a fixed shape on the metering conveyor belt 200.

[0069] For example, due to the material or manufacturing process of the metering conveyor belt 200, the metering conveyor belt 200 is made of materials with different densities or different materials in its width direction, so that the metering conveyor belt 200 itself has a material receiving groove with a fixed shape (not shown in the figure), and the particulate material can directly fall into the material receiving groove 201 with a fixed shape on the metering conveyor belt 200.

[0070] For another example, the metering conveyor belt 200 is a deformable metering conveyor belt. The deformable metering conveyor belt deforms when carrying the particulate material from the discharging part to form the material receiving groove 201 (as Figure 2 shown). For example, a limiting structure with a fixed shape can be provided below the metering conveyor belt. After the particulate material falls into the metering conveyor belt 200, under the action of the gravity of the particulate material, the metering conveyor belt can deform downward and contact the limiting structure with a fixed shape below, and the metering conveyor belt thus forms a material receiving groove 201 with a fixed shape.

[0071] Of course, there can be other implementation manners for forming the material receiving groove 201 with a fixed shape on the metering conveyor belt 200, and the present application does not make specific limitations.

[0072] The following specifically elaborates on one implementation manner of forming the material receiving groove 201 with a fixed shape on the metering conveyor belt 200.

[0073] Figure 3 It is a schematic structural diagram of another metering system provided by an embodiment of the present application.

[0074] In the metering system provided by an embodiment of the present application, the metering conveyor belt 200 is a deformable metering conveyor belt. The deformable metering conveyor belt deforms when carrying the particulate material from the discharging part to form the material receiving groove 201.

[0075] In a specific embodiment, as Figure 3 shown in FIGS. 4(a) and 4(b), the metering system provided by the embodiment of the present application further includes a guide roller 30, and the installation position of the guide roller 30 corresponds to the discharging part 130; the structure of the material accommodating groove 201 is defined by the guide roller.

[0076] In this way, under the action of the gravity of the granular material from the discharging part 130, the metering conveyor belt can deform downward until the metering conveyor belt contacts the guide roller below it, and a material accommodating groove 201 with a fixed shape is formed on the metering conveyor belt. That is to say, the structure (i.e., shape) of the material accommodating groove 201 can be defined by the guide roller 30, so that the shape of the material accommodating groove 201 is shaped into a fixed shape related to the shape of the guide roller 30.

[0077] For easy understanding, for example, as shown in FIGS. 4(a) and 4(b), the guide roller 30 includes a support roller 301 arranged in the width direction of the metering conveyor belt 200 and shaping rollers 302 located on both sides of the support roller 301; both the support roller and the shaping rollers are within the coverage range of the granular material discharged from the discharging part.

[0078] In this way, under the action of the gravity of the granular material from the discharging part 130, the metering conveyor belt deforms downward until the metering conveyor belt contacts the guide roller below it, and a material accommodating groove 201 with a fixed shape is formed on the metering conveyor belt. Among them, the structure (i.e., shape) of the material accommodating groove 201 can be defined by the support roller 301 and the shaping rollers 302, so that the shape of the material accommodating groove 201 is shaped into a fixed shape related to the shape formed by a support roller 301 and the shaping rollers 302 on both sides of it. It can be understood that the shape formed by a support roller 301 and the shaping rollers 302 on both sides of it is also perpendicular to the length direction of the metering conveyor belt 200.

[0079] Specifically, one support roller corresponds to two shaping rollers; the number of the support rollers is at least one, and the number of the shaping rollers is at least two; the at least one support roller and the at least two shaping rollers are both located in a target area close to the inner surface of the metering conveyor belt, and the target area is the vertical projection area of the discharging part on the metering conveyor belt.

[0080] In this way, the number of support rollers and the number of shaping rollers can be multiple. In the length direction of the metering conveyor belt 200, multiple support rollers can be arranged side by side, and two shaping rollers are arranged on both sides of each support roller. In this way, any cross-section of the material accommodating groove 201 perpendicular to the length direction of the metering conveyor belt 200 is of a fixed shape, making the structure of the material accommodating groove 201 more stable.

[0081] It can be understood that the guiding roller has a fixed shape. The guiding roller having a fixed shape means that the shape of the guiding roller does not change before and after the granular material falls onto the metering conveyor belt. The guiding roller can be used to bear the weight of the metering conveyor belt and the granular material and shape it. Among them, the guiding roller can include various forms. Correspondingly, the supporting roller and the shaping roller also include various forms. For example, as shown in FIGS. 4(a) and 4(b), the supporting roller 301 is of a concave structure, and the shaping roller 302 is of an L-shaped structure. In this case, the cross-sectional shape of the material receiving groove shaped by the concave supporting roller and the L-shaped shaping rollers on both sides thereof can be a U-shaped structure. Another example is that the supporting roller can be of a linear structure, and the shaping roller is of a linear structure. In this case, the cross-sectional shape of the material receiving groove shaped by the linear supporting roller and the linear shaping rollers on both sides thereof can be a square structure or a trapezoidal structure. Of course, the supporting roller and the shaping roller can also be other structures, which are not limited in this application.

[0082] In addition, the supporting roller can be a telescopic supporting roller. The telescopic property of the supporting roller means that before the metering system performs metering work, the present application can extend or retract the supporting roller to adjust the length of the supporting roller to a fixed value, so as to adjust the width of the cross-sectional shape of the material receiving groove to a fixed value, and adjust the cross-sectional area of the material receiving groove to a fixed value. Then, when the metering system performs metering work on solid particulate matter, the metering work is carried out according to the material receiving groove with the adjusted fixed cross-sectional shape.

[0083] In a specific embodiment, taking the metering system provided in FIGS. 4(a) and 4(b) as an example, the supporting roller 301 is of a concave structure, and the shaping roller 302 is of an L-shaped structure. In this way, the cross-sectional shape of the material receiving groove 201 is shaped into a fixed U shape, and the cross-sectional shape of the granular material a in the material receiving groove 201 is a U shape similar to the cross-sectional shape of the material receiving groove 201. In this way, if the distance between the discharging part 130 and the supporting roller 301 is L1, the thickness of the metering conveyor belt 200 is L2, and the distance between the two shaping rollers on both sides of the supporting roller is L3, then for the U-shaped cross-sectional shape of the granular material a, the depth of the granular material a accumulated in the material receiving groove 201 is related to the distance L1 between the discharging part 130 and the supporting roller 301 and the thickness L2 of the metering conveyor belt 200, and the width of the granular material a accumulated in the material receiving groove 201 is related to the thickness L2 of the metering conveyor belt 200 and the distance L3 between the two shaping rollers on both sides of the supporting roller. Thus, the area of the U-shaped cross-section of the granular material a in the material receiving groove 201 can be accurately obtained. Furthermore, by combining the area of the U-shaped cross-section of the granular material a and the length of the granular material a accumulated on the metering conveyor belt 200 per unit time (this length is determined by the speed of the metering conveyor belt), the volume of the granular material supplied by the tank body 10 per unit time can be accurately obtained.

[0084] In addition, in order to more accurately limit the cross-sectional shape of the particulate material a in the material receiving groove 201, in the metering system provided in the embodiment of the present application, as Figure 2 shown, the discharging part is arranged to cooperate with the material receiving groove so that the amount of material carried by the material receiving groove remains constant. In this way, when the discharging part cooperates with the material receiving groove, the material amount falls into the material receiving groove, and the discharging part levels the top surface of the particulate material in the material receiving groove, so that the cross-sectional area of the material carried by the material receiving groove remains constant, and the amount of material carried by the material receiving groove remains constant.

[0085] It can be understood that the cross-sectional area of the structure formed by the particulate material carried by the material receiving groove can be less than or equal to the cross-sectional area of the material receiving groove. Based on this, the height of the bottom of the discharging part is less than or equal to the height of the top of the material receiving groove, and the outer side wall of the discharging part abuts against the inner side wall of the material receiving groove. In this way, the discharging part levels the top surface of the particulate material in the material receiving groove, so that the cross-sectional area of the material carried by the material receiving groove remains constant, and the amount of material carried by the material receiving groove remains constant. Specifically, there are different implementation manners for the cooperation between the discharging part and the material receiving groove, which will be specifically described below.

[0086] In a specific embodiment, as shown in Fig. 4(a), in order to more accurately limit the cross-sectional shape of the particulate material a in the material receiving groove 201, in the metering system provided in the embodiment of the present application, the discharging part is a cylindrical structure or a cuboid structure, the bottom of the discharging part is flush with the top of the material receiving groove, and the outer diameter or side length of the discharging part is equal to the width of the top of the material receiving groove.

[0087] In this way, all the material a discharged by the discharging part 130 falls into the material receiving groove 201, and both sides of the bottom of the discharging part 130 are simultaneously in contact with the top ends of the two inner side walls of the groove body, so that the discharging part 130 levels the top surface of the particulate material in the material receiving groove, thereby more accurately limiting the cross-sectional shape of the particulate material, and thus more accurately obtaining the cross-sectional area of the particulate material.

[0088] In another specific embodiment, as shown in Fig. 4(b), in order to more accurately limit the cross-sectional shape of the particulate material a in the material receiving groove 201, in the metering system provided in the embodiment of the present application, the discharging part is a cylindrical structure or a cuboid structure, at least a part of the discharging part extends to the target position in the material receiving groove, and the outer diameter or side length of the discharging part is equal to the width of the material receiving groove at the target position.

[0089] In this way, since at least a part of the discharging portion 130 extends into the material accommodating groove 201, and the outer diameter or side length of the discharging portion is equal to the width of the material accommodating groove at the target position, the discharging portion is adapted to the material accommodating groove, so that the height of the granular material in the material accommodating groove does not exceed the discharging portion, and the discharging portion levels the top surface of the granular material in the material accommodating groove, thereby more accurately restricting the cross-sectional shape of the granular material, and thus more accurately obtaining the cross-sectional area of the granular material.

[0090] It can be understood that the discharging portion 130 can be a telescopic discharging portion, and the telescopic discharging portion can be telescopic along the direction towards the metering conveyor belt 200; for the telescopic discharging portion, since the discharging portion 130 is telescopic, the distance L1 between the discharging portion 130 and the support roller 301 can be adjusted, so that the depth of the granular material accumulated in the accommodating groove 201 can be adjusted, that is to say, correspondingly, the area of the cross-section of the granular material can be adjusted to meet the actual production needs.

[0091] For example, as shown in FIG. 5(a), the telescopic discharging portion includes a first discharging portion 131 and a second discharging portion 132. The second discharging portion is embedded in the first discharging portion, and the second discharging portion is telescopic along the direction perpendicular to the metering conveyor belt. In this way, by moving the second discharging portion back and forth relative to the first discharging portion, the distance between the discharging portion 130 and the support roller 301 can be flexibly adjusted, so as to adjust the depth of the granular material accumulated in the material accommodating groove 201.

[0092] Among them, as shown in FIG. 5(a), when the discharging portion is a telescopic discharging portion, the discharging portion includes a first discharging portion 131 and a second discharging portion 132. The outer diameter or side length of the discharging portion can be the outer diameter or side length of the second discharging portion, and the outer diameter or side length of the second discharging portion is equal to the width of the material accommodating groove at the target position. In this way, the second discharging portion cooperates with the material accommodating groove, so that the height of the granular material a in the material accommodating groove does not exceed the height of the bottom of the second discharging portion 132, and the second discharging portion levels the top surface of the granular material in the material accommodating groove, thereby more accurately restricting the cross-sectional shape of the granular material, and thus more accurately obtaining the cross-sectional area of the granular material.

[0093] In addition, in another embodiment, the discharging portion may further include a replaceable discharging portion. For example, the discharging portion includes a first discharging portion and a second discharging portion. The first discharging portion is connected to the second discharging portion, and the distance between the second discharging portion and the material accommodating groove is less than the distance between the first discharging portion and the material accommodating groove, and the second discharging portion is a replaceable discharging portion.

[0094] In this way, by replacing the second discharge part with different sizes, the distance between the discharge part and the support roller can be preset, so that the depth of the granular material accumulated in the accommodation groove 201 can be adjusted. Correspondingly, the area of the cross-section of the granular material can be adjusted to meet the actual production requirements.

[0095] In addition, in another embodiment, as shown in FIGS. 5(b)-5(c), the discharge part 130 includes a first discharge part 131 and a second discharge part 132. The first discharge part is connected to the second discharge part. The first discharge part has a circular cross-section, and the second discharge part has an elliptical cross-section. The cross-sectional area of the first discharge part is equal to the cross-sectional area of the second discharge part. The distance between the second discharge part and the material accommodation groove is less than the distance between the first discharge part and the material accommodation groove. The height of the bottom of the second discharge part is less than or equal to the height of the top of the material accommodation groove. The outer side wall of the second discharge part abuts against the inner side wall of the material accommodation groove.

[0096] Among them, the cross-sectional area of the first discharge part is equal to the cross-sectional area of the second discharge part. In this way, it can be ensured that the volume of the granular material passing through the first discharge part per unit time is equal to the volume of the granular material passing through the second discharge part per unit time, so that the granular material can smoothly pass through the first discharge part and the second discharge part in sequence.

[0097] Among them, the distance between the second discharge part and the material accommodation groove is less than the distance between the first discharge part and the material accommodation groove. The height of the bottom of the second discharge part is less than or equal to the height of the top of the material accommodation groove. The outer side wall of the second discharge part abuts against the inner side wall of the material accommodation groove. In this way, the second discharge part can level the top surface of the granular material in the material accommodation groove, so as to more accurately limit the cross-sectional shape of the granular material, and thus more accurately obtain the cross-sectional area of the structure formed by the granular material in the material accommodation groove.

[0098] Among them, more importantly, the second discharge part has an elliptical cross-section. The elliptical cross-section can be an elliptical shape or other similar elliptical shapes. In this way, the length of the part of the second discharge part that contacts the top surface of the granular material in the material accommodation groove is longer, so as to ensure that the granular material in the material accommodation groove is filled more fully and the filling rate is better.

[0099] For example, as shown in FIGS. 5(b)-5(c), the shape of the elliptical cross-section of the second discharge portion can be regarded as a symmetric figure composed of a rectangle and two semi-circular shapes at both ends of the rectangle. Among them, the diameter of the semi-circular shape is equal to the width of the rectangle. It can be understood that this elliptical cross-section has two parallel straight edges and two semi-circular arcs with the same diameter. Among them, the outer sidewalls where the two straight edges of the elliptical cross-section of the second discharge portion are respectively in contact with the two inner sidewalls of the material accommodating groove. In this way, the length directions of the two straight edges of the elliptical cross-section are parallel to the length direction of the metering conveyor belt 200. Thus, the length of the portion of the second discharge portion that is in contact with the top surface of the granular material in the material accommodating groove is longer, so as to ensure that the granular material in the material accommodating groove is filled more fully and the filling rate is better. In this way, the structure formed by the granular material in the material accommodating groove is more plump and standard, avoiding defects such as voids in the structure formed by the granular material in the material accommodating groove, and thus more accurately obtaining the cross-sectional area of the structure formed by the granular material in the material accommodating groove.

[0100] In addition, as Figure 3 shown, in order to ensure the stable operation of the tank body 10 and the metering conveyor belt device 20, the metering system provided by the embodiment of the present application further includes a base bracket 40. The tank body 10 is fixedly connected to the base bracket 40, and the metering conveyor belt device 20 is fixedly connected to the base bracket 40.

[0101] For ease of understanding, for example, taking the metering conveyor belt device 20 including a head roller, a tail roller and a metering conveyor belt 200 as an example, the coaxial component of the head roller and the tail roller can be fixedly connected to the base bracket 40. Under the action of the frictional force between the metering conveyor belt and the head roller and the tail roller, the metering conveyor belt can run in a cycle. On the other hand, each edge of the cylindrical structure of the tank body 10 can be fixedly connected to the base bracket 40. In this way, the tank body 10 can be stably erected through the base bracket 40, and the metering conveyor belt 200 can be located below the storage tank body 100.

[0102] Figure 6-7 It is a schematic structural diagram of another metering system provided by the embodiment of the present application.

[0103] As Figure 6-7 shown, in the metering system provided by the embodiment of the present application, the tank body 10 includes: a main container 100 and an extension container 100. The extension container 110 is communicated with the main container 100, and the extension container is movably connected to the main container;

[0104] The tank body 10 has a first state and a second state. In the first state, the extension container is embedded in the main container; in the second state, the extension container extends at least partially out of the main container.

[0105] Among them, the extension container can extend at least partially relative to the main container along a direction perpendicular to the height direction of the main container. When all parts of the extension container extend along a direction perpendicular to the height direction of the main container, the total volume of the tank body is the sum of the volume of the extension container and the volume of the main container.

[0106] Among them, as Figure 6 shown, the tank body 10 may further include a discharge valve 120, and the discharge valve 120 is arranged on the tank body 10 and located between the main container 100 and the discharge part 130. For the convenience of understanding, for example, the discharge valve can be a baffle with an adjustable opening degree, and by adjusting the opening degree of the baffle, the control of the granular material falling onto the metering conveyor belt is realized. Of course, the discharge valve can also be other structures, and the embodiments of the present application do not limit this. In this way, by opening or closing the discharge valve, the granular material stored in the tank body can be controlled to flow out quickly from the discharge part.

[0107] In this way, for the tank body 10 provided by the embodiments of the present application, since the extension container extends along a direction perpendicular to the height direction of the main container, before and after the extension of the extension container, the height of the center of gravity of the tank body remains unchanged, and the stability of the tank body is not affected. Under the condition that the height of the center of gravity of the tank body remains unchanged, a large-scale expansion of the volume of the tank body is realized.

[0108] In addition, based on any of the above metering systems provided by the embodiments of the present application, the embodiments of the present application further provide a fracturing supply system adopting any of the above metering systems.

[0109] Next, in combination with Figure 8 to specifically describe the fracturing supply system provided by the embodiments of the present application.

[0110] In practical applications, taking the tank body 10 as a sand storage tank as an example, Figure 8 is a schematic structural diagram of a fracturing supply system in a practical application provided by the embodiments of the present application.

[0111] As Figure 8 shown, the fracturing supply system provided by the embodiments of the present application may include: any of the metering systems provided by the embodiments of the present application, a second conveyor belt device 50, and a sand mixing device 60.

[0112] Among them, the metering conveyor belt device 20 is connected to the second conveyor belt device 50, and the second conveyor belt device 50 is connected to the sand mixing device 60.

[0113] It can be understood that, classified by function, the conveyor belt device provided in this application includes a first conveyor belt device and a second conveyor belt device: the first conveyor belt device has the function of measuring the supply amount of the granular material being conveyed, such as the metering conveyor belt device 20 mentioned above; the second conveyor belt device does not have the function of measuring the conveying amount of the granular material being conveyed, such as the second conveyor belt device 50 mentioned above.

[0114] In the fracturing operation of oil and gas field development, taking granular material as a proppant (the proppant may include quartz sand) as an example, the process of granular material supply is generally as follows: the proppant stored in the tank 10 falls onto the metering conveyor belt 200 under the action of gravity; by combining the known conveying speed of the metering conveyor belt 200 and the cross-sectional area of the granular material a discharged from the discharge port, the addition amount (volume) of the proppant per unit time is obtained, realizing the accurate metering addition of the proppant; the metering conveyor belt device 20 conveys the accurately metered proppant to the second conveyor belt device 50, and the second conveyor belt device 50 conveys the proppant into the hopper of the sand mixing device 60. After the proppant is mixed with a certain proportion of liquid, it is injected into the formation fracture. Since the density of the proppant is greater than the formation density, it can support the formation fracture in an open state and improve the oil flow environment.

[0115] In addition, based on any one of the above-mentioned metering systems provided by the embodiments of this application, an embodiment of this application provides a metering method, which is applied to any one of the above-mentioned metering systems provided by the embodiments of this application.

[0116] Figure 9 It is a schematic flowchart of a metering method provided by an embodiment of this application.

[0117] As Figure 9 shown, the metering method provided by the embodiment of this application includes:

[0118] Step 910: Obtain the speed of the metering conveyor belt.

[0119] In the embodiment of this application, the speed of the metering conveyor belt can represent the speed of the granular material conveyed on the metering conveyor belt. The volume of the granular material per unit time is related to the speed of the metering conveyor belt.

[0120] Among them, there are various ways to obtain the speed of the metering conveyor belt. For example, the speed of the metering conveyor belt is determined by a speed measurement sensor; or, the speed of the metering conveyor belt is determined by the specific working mode of the motor in the metering conveyor belt device, or the speed of the metering conveyor belt can be determined by the rotation speed of the motor; of course, it can also be determined by other methods, and this application does not make specific limitations.

[0121] Step 920: Obtain the height between the discharge part and the metering conveyor belt.

[0122] In the embodiment of the present application, the height between the discharging part and the metering conveyor belt is related to the depth of the granular material in the material accommodating groove 201 on the metering conveyor belt.

[0123] It can be understood that during the cyclic operation of the metering conveyor belt, the granular material in the material accommodating groove 201 is just flush with the lowest point of the discharging part. In this way, the height between the discharging part and the metering conveyor belt can include the distance between the lowest point of the discharging part and the lowest point of the material accommodating groove on the metering conveyor belt. And the distance between the lowest point of the discharging part and the lowest point of the material accommodating groove on the metering conveyor belt is the depth of the granular material in the material accommodating groove 201.

[0124] In the embodiment of the present application, the distance between the lowest point of the discharging part and the lowest point of the material accommodating groove on the metering conveyor belt can be measured by measuring tools such as calipers or tape measures, so as to obtain the height between the discharging part and the metering conveyor belt.

[0125] Of course, other measurement methods can also be used to determine the distance between the lowest point of the discharging part and the lowest point of the material accommodating groove on the metering conveyor belt, and the present application does not make specific limitations.

[0126] Step 930: Based on the height between the discharging part and the metering conveyor belt, obtain the cross-sectional area of the first target structure formed by the granular material accumulated between the material accommodating groove and the discharging part.

[0127] In the embodiment of the present application, the cross-sectional area of the first target structure formed by the granular material accumulated between the material accommodating groove and the discharging part is the area of the cross-section of the first target structure. The cross-section of the first target structure can be the cross-section of the material accommodating groove perpendicular to the length direction of the metering conveyor belt.

[0128] For the area of the cross-section of the first target structure, the depth of the cross-section of the first target structure is the height between the discharging part and the metering conveyor belt, and the width of the cross-section of the first target structure is the width of the material accommodating groove. In this way, combining the depth and the width of the cross-section of the first target structure, the cross-sectional area of the first target structure is obtained.

[0129] For example, the depth of the cross-section of the first target structure can be denoted as b, and the width of the cross-section of the first target structure can be denoted as c. On this basis, if the cross-section of the material accommodating groove is rectangular, then the cross-section of the first target structure formed by the granular material accumulated between the material accommodating groove and the discharging part is also rectangular. At this time, the product of the depth b and the width c of the cross-section of the first target structure can be used as the cross-sectional area of the first target structure. Another example, if the cross-section of the material accommodating groove is U-shaped, then the cross-section of the first target structure formed by the granular material accumulated between the material accommodating groove and the discharging part is also U-shaped. The U-shaped cross-section of the first target structure can be decomposed into a rectangular part and a semi-circular part. At this time, the length of the rectangular part is c, the width is b - c / 2, and the radius of the semi-circular part is c / 2. The cross-sectional area of the first target structure can be . Of course, the shape of the material accommodating groove can be other fixed shapes, and the present application does not make any restrictions.

[0130] Step 940: Based on the speed of the metering conveyor belt and the cross-sectional area of the first target structure, obtain the volume of the granular material per unit time.

[0131] In the embodiment of the present application, the product of the speed of the metering conveyor belt and the cross-sectional area of the first target structure can be used as the volume of the granular material per unit time. It can be understood that the speed of the metering conveyor belt can represent the length of the granular material discharged from the discharging part in the length direction of the metering conveyor belt per unit time, and the cross-sectional area of the first target structure can represent the cross-sectional area of the granular material discharged from the discharging part in the direction perpendicular to the length direction of the metering conveyor belt. The two are multiplied to obtain the volume of the granular material per unit time.

[0132] The metering method provided by the embodiment of the present application includes obtaining the speed of the metering conveyor belt; obtaining the height between the discharging part and the metering conveyor belt; based on the height between the discharging part and the metering conveyor belt, obtaining the cross-sectional area of the first target structure formed by the granular material accumulated between the material accommodating groove and the discharging part; based on the speed of the metering conveyor belt and the cross-sectional area of the first target structure, obtaining the volume of the granular material per unit time. In this way, the cross-sectional area of the first target structure formed by the granular material accumulated between the material accommodating groove and the discharging part can be accurately obtained through the material accommodating groove with a fixed shape, so as to combine the cross-sectional area of the first target structure with the speed of the metering conveyor belt to achieve accurate metering of the granular material.

[0133] In a specific embodiment, a metering method provided by the embodiment of the present application is applied to the metering system shown in FIG. 4(a) provided by the embodiment of the present application.

[0134] When the guiding roller includes a supporting roller disposed in the width direction of the metering conveyor belt and shaping rollers located on both sides of the supporting roller, the obtaining of the height between the discharging portion and the metering conveyor belt includes:

[0135] Obtaining the distance between the discharging portion and the supporting roller, and the thickness of the metering conveyor belt;

[0136] Subtracting the thickness of the metering conveyor belt from the distance between the discharging portion and the supporting roller to obtain the height between the discharging portion and the metering conveyor belt;

[0137] Correspondingly, the obtaining of the cross-sectional area of the first target structure formed by the granular material accumulated between the material receiving groove and the discharging portion based on the height between the discharging portion and the metering conveyor belt includes:

[0138] Obtaining the distance between two shaping rollers located on both sides of the supporting roller;

[0139] Based on the distance between the two shaping rollers and the height between the discharging portion and the metering conveyor belt, obtaining the cross-sectional area of the first target structure formed by the granular material accumulated between the material receiving groove and the discharging portion.

[0140] In the embodiments of the present application, subtracting the thickness of the metering conveyor belt from the distance between the discharging portion and the supporting roller to obtain the height between the discharging portion and the metering conveyor belt, and the height between the discharging portion and the metering conveyor belt can be the depth of the cross-section of the first target structure; and subtracting twice the thickness of the metering conveyor belt from the distance between two shaping rollers on both sides of the supporting roller to obtain the width of the cross-section of the first target structure formed by the granular material accumulated between the material receiving groove and the discharging portion. Furthermore, the cross-sectional area of the first target structure can be obtained by combining the depth and the width of the cross-section of the first target structure.

[0141] In another specific embodiment, the discharging portion is a telescopic discharging portion, and the metering method provided by the embodiments of the present application further includes:

[0142] When the discharging portion is a telescopic discharging portion and it is necessary to adjust the volume of the granular material per unit time, adjusting the height between the telescopic discharging portion and the metering conveyor belt through the telescopic movement of the telescopic discharging portion;

[0143] Obtaining the adjusted height between the telescopic discharging portion and the metering conveyor belt;

[0144] Based on the adjusted height between the telescopic discharging part and the metering conveyor belt, obtain the cross-sectional area of the second target structure formed by the granular material accumulated between the material accommodating groove and the adjusted telescopic discharging part.

[0145] Based on the speed of the metering conveyor belt and the cross-sectional area of the second target structure, obtain the volume of the granular material per unit time.

[0146] It can be understood that the telescopic discharging part is telescopic along the direction towards the metering conveyor belt. Before and after the telescopic discharging part is telescoped, the height between the telescopic discharging part and the metering conveyor belt changes. In this way, when it is necessary to adjust the volume of the granular material discharged by the discharging part per unit time, the cross-sectional area of the granular material discharged by the discharging part can be adjusted by telescoping the discharging part.

[0147] Of course, the volume of the granular material discharged by the discharging part per unit time can also be adjusted by adjusting the width of the material accommodating groove, or adjusting the speed of the metering conveyor belt, etc. This application does not make any restrictions.

[0148] In the embodiment of the present application, subtract the thickness of the metering conveyor belt from the distance between the adjusted telescopic discharging part and the supporting roller to obtain the height between the adjusted telescopic discharging part and the metering conveyor belt, and the height between the adjusted telescopic discharging part and the metering conveyor belt can be the depth of the cross-section of the second target structure; and subtract twice the thickness of the metering conveyor belt from the distance between the two shaping rollers on both sides of the supporting roller to obtain the width of the cross-section of the second target structure formed by the granular material accumulated between the material accommodating groove and the discharging part. Furthermore, the cross-sectional area of the second target structure can be obtained by combining the depth of the cross-section of the second target structure and the width of the cross-section of the second target structure. Furthermore, take the product of the speed of the metering conveyor belt and the cross-sectional area of the second target structure as the volume of the granular material per unit time.

[0149] The above are only the embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

1. A metering system for granular materials, characterized in that, the metering system includes: a tank body and a metering conveyor belt device; the tank body includes a discharging part, the metering conveyor belt device includes a metering conveyor belt, and the metering conveyor belt is arranged to face the discharging part so that the granular materials from the discharging part can fall onto the metering conveyor belt; wherein, there is a material receiving groove with a fixed shape at the position corresponding to the discharging part on the metering conveyor belt; the metering conveyor belt is a deformable metering conveyor belt, and the deformable metering conveyor belt deforms when carrying the granular materials from the discharging part to form the material receiving groove; the discharging part is arranged to cooperate with the material receiving groove so that the amount of materials carried by the material receiving groove remains constant; the height of the bottom of the discharging part is less than or equal to the height of the top of the material receiving groove, and the outer side wall of the discharging part abuts against the inner side wall of the material receiving groove; the metering system further includes a guide roller, and the installation position of the guide roller corresponds to the discharging part.

2. The metering system according to claim 1, characterized in that, the structure of the material receiving groove is defined by the guide roller.

3. The metering system according to claim 2, characterized in that, the guide roller includes a support roller arranged in the width direction of the metering conveyor belt and shaping rollers located on both sides of the support roller; both the support roller and the shaping rollers are within the coverage range of the granular materials discharged from the discharging part.

4. The metering system according to claim 3, characterized in that, one support roller corresponds to two shaping rollers; the number of the support rollers is at least one, and the number of the shaping rollers is at least two; the at least one support roller and the at least two shaping rollers are both located in a target area close to the inner surface of the metering conveyor belt, and the target area is the vertical projection area of the discharging part on the metering conveyor belt.

5. The metering system according to claim 4, characterized in that, the support roller is of a concave structure or a linear structure, and the shaping roller is of an L-shaped structure or a linear structure.

6. The metering system according to claim 3, characterized in that, the support roller is a telescopic support roller.

7. The metering system according to claim 1, characterized in that, the discharging part is of a cylindrical structure or a cuboid structure, the bottom of the discharging part is flush with the top of the material receiving groove, and the outer diameter or side length of the discharging part is equal to the width of the top of the material receiving groove.

8. The metering system according to claim 1, characterized in that, the discharging part is of a cylindrical structure or a cuboid structure, at least a part of the discharging part extends to a target position inside the material receiving groove, and the outer diameter or side length of the discharging part is equal to the width of the material receiving groove at the target position.

9. The metering system according to claim 1, characterized in that, The discharging part includes a first discharging part and a second discharging part. The first discharging part is connected to the second discharging part. The first discharging part has a circular cross-section, and the second discharging part has an elliptical cross-section. The cross-sectional area of the first discharging part is equal to that of the second discharging part. The distance between the second discharging part and the material accommodating groove is less than the distance between the first discharging part and the material accommodating groove. The height of the bottom of the second discharging part is less than or equal to the height of the top of the material accommodating groove, and the outer sidewall of the second discharging part abuts against the inner sidewall of the material accommodating groove.

10. The metering system according to any one of claims 7-9, characterized in that, the cross-section of the material accommodating groove is U-shaped, square or trapezoidal.

11. The metering system according to any one of claims 1-5, characterized in that, the discharging part is a telescopic discharging part. The telescopic discharging part includes a first discharging part and a second discharging part. The second discharging part is embedded in the first discharging part, and the second discharging part is telescopic in a direction perpendicular to the metering conveyor belt.

12. The metering system according to any one of claims 1-5, characterized in that, the discharging part includes a first discharging part and a second discharging part. The first discharging part is connected to the second discharging part, and the distance between the second discharging part and the material accommodating groove is less than the distance between the first discharging part and the material accommodating groove. The second discharging part is a replaceable discharging part.

13. A metering method applied to the metering system according to any one of claims 1-12, characterized in that, the metering method includes: obtaining the speed of the metering conveyor belt; obtaining the height between the discharging part and the metering conveyor belt; based on the height between the discharging part and the metering conveyor belt, obtaining the cross-sectional area of a first target structure formed by the granular material accumulated between the material accommodating groove and the discharging part; based on the speed of the metering conveyor belt and the cross-sectional area of the first target structure, obtaining the volume of the granular material per unit time.

14. The metering method according to claim 13, characterized in that, when the guiding roller includes a supporting roller arranged in the width direction of the metering conveyor belt and shaping rollers located on both sides of the supporting roller, the obtaining the height between the discharging part and the metering conveyor belt includes: obtaining the distance between the discharging part and the supporting roller, and the thickness of the metering conveyor belt; subtracting the thickness of the metering conveyor belt from the distance between the discharging part and the supporting roller to obtain the height between the discharging part and the metering conveyor belt; correspondingly, the obtaining the cross-sectional area of a first target structure formed by the granular material accumulated between the material accommodating groove and the discharging part based on the height between the discharging part and the metering conveyor belt includes: obtaining the distance between two shaping rollers located on both sides of the supporting roller; Based on the distance between the two profiling rollers and the height between the discharging part and the metering conveyor belt, obtain the cross-sectional area of the first target structure formed by the granular material accumulated between the material receiving groove and the discharging part.

15. The metering method according to claim 13, wherein, the metering method further includes: in the case where the discharging part is a telescopic discharging part and it is necessary to adjust the volume of the granular material per unit time, adjust the height between the telescopic discharging part and the metering conveyor belt through the telescopic movement of the telescopic discharging part; obtain the height between the adjusted telescopic discharging part and the metering conveyor belt; based on the height between the adjusted telescopic discharging part and the metering conveyor belt, obtain the cross-sectional area of the second target structure formed by the granular material accumulated between the material receiving groove and the adjusted telescopic discharging part; based on the speed of the metering conveyor belt and the cross-sectional area of the second target structure, obtain the volume of the granular material per unit time.

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