Bulk solid particle material flowmeter

Abstract

The utility model discloses a bulk solid particle material flow meter, which belongs to the field of equipment for measuring particle material flow in a pipeline, aims to solve the problems of large full-range displacement, easiness in oscillation, influence on response and limitation on signal processing of strain type sensing metering equipment, and comprises a shell, a feeding port is formed in the upper portion of the left side of the shell, a discharging port is formed in the lower portion of the opposite right side of the shell, a feeding buffer box is further included, a partition plate is arranged in the feeding buffer box and divides the feeding buffer box into a discharging cavity and a boiling cavity which are communicated with each other, the feeding port is communicated with the upper portion of the discharging cavity, and a spraying nozzle is communicated with one side of the boiling cavity. A single-cantilever-beam sensor is installed below the upper cover of the shell and connected with a punching plate through a connecting arm and a punching plate support, the upper portion of the punching plate corresponds to the tangent plane of the material spraying nozzle, a breathable plate is arranged at the bottom of the feeding buffering box, and one side of the bottom of the shell is communicated with an air supply opening.

Description

Technical Field

[0001] The utility model relates to the field of equipment for measuring the flow rate of granular matter in a pipeline, in particular to a bulk solid granular material flow meter. Background Art

[0002] At present, there are relatively few manufacturers of bulk solid particle metering equipment in China, and most of them use technologies from E+H of Germany and Sankyo of Japan in the 1980s and 1990s. These two technical routes, namely E+H's wave spring plate plus differential transformer detection method and Sankyo's cross spring plus differential transformer measurement method, each have some significant disadvantages.

[0003] The main disadvantages of the E+H solution include:

[0004] High material cost: Wave spring plates need to be made of constant elastic alloy materials (such as 3J53 or 4J32), which are not only expensive but also complex to process.

[0005] Limited linearity: Due to the limitations of heat treatment and assembly processes, the linearity of the wave spring plate is difficult to reach a level higher than 1‰.

[0006] Poor temperature drift and repeatability indicators: The temperature drift and repeatability indicators of this solution are about 0.5%, which is a significant disadvantage for high-precision measurement.

[0007] Limited damping method: Silicone oil is used as the damping medium, which cannot be fully sealed due to its structural limitations, so it cannot be used normally in high dust environments.

[0008] Greatly affected by airflow: When measuring materials using pneumatic conveying, this solution is greatly affected by airflow, which may cause accuracy errors of more than ±10%.

[0009] The disadvantages of Japan's Sankyo plan include:

[0010] Equally high material costs: The cross spring leaf also needs to be made of constant elastic alloy material, which is more expensive.

[0011] Linearity error: Since the sensing arm adopts a lever-type design, the motion trajectory of its differential transformer is a circle rather than a straight line, which will cause a certain linearity error.

[0012] Drop point error: The lever-type sensor arm structure causes detection errors when the drop point is at different positions on the punch plate.

[0013] The damping method is also limited: silicone oil is also used as the damping medium, which cannot be fully sealed and is not suitable for applications in high dust conditions.

[0014] Also greatly affected by airflow: In the material metering of pneumatic conveying, this solution is also greatly affected by airflow, which may cause accuracy errors of more than ±10%.

[0015] In recent years, although there are also metrological equipment that use strain sensors as measuring elements in China, there are still some defects in actual use. For example, the full-range displacement distance of the sensor is too large, which is prone to excessive free oscillation. Although the vibration can be suppressed by adding counterweights to play a damping role, it will also affect the response speed. In addition, the subsequent signal processing uses a single-chip microcomputer, which has improved the intelligence level of the equipment to a certain extent, but there are still certain limitations in field applications. Utility Model Content

[0016] In view of the deficiencies in the prior art, the utility model proposes a bulk solid particle material flow meter, comprising a shell, a feed port is provided on the left side of the shell, and a discharge port is provided on the lower right side relative to the shell, and also comprises a feed buffer box, a partition is provided inside the feed buffer box, the partition divides the feed buffer box into two interconnected blanking chambers and a boiling chamber, the feed port is connected to the top of the blanking chamber, one side of the boiling chamber is connected to a spray nozzle, a single cantilever beam sensor is installed below the shell cover, the single cantilever beam sensor is connected to a punch plate through a connecting arm and a punch plate support, the top of the punch plate corresponds to the cross-section of the spray nozzle, a breathable plate is provided at the bottom of the feed buffer box, one side of the bottom of the shell is connected to an air supply port, and the air supply port is located below the breathable plate, a first exhaust port and a second exhaust port are arranged in parallel above the shell cover, a control box is connected in the notch of the shell, and a PLC is provided inside the control box.

[0017] As a further improvement of the present invention, an inspection port is provided on one side of the shell, and a compressed air interface for draining blockage is connected to the bottom edge of the shell.

[0018] As a further improvement of the present invention, the single cantilever beam sensor is installed below the upper cover of the housing through a sensor seat and a sensor mounting base.

[0019] As a further improvement of the utility model, it also includes a left inspection door, a right inspection door and an upper inspection door.

[0020] As a further improvement of the present invention, the left inspection door, the right inspection door and the upper inspection door are respectively installed on both sides and the top of the shell.

[0021] As a further improvement of the utility model, the punching plate is at an angle of 45 degrees to the horizontal direction.

[0022] Beneficial effects of the utility model:

[0023] 1. The structural design adopts a combination of feed buffer, overflow and spray nozzle, so that the angle between the falling direction and the punch plate is independent of the amount of material, ensuring the consistency of the force on the sensor.

[0024] 2. A buffered pneumatic overflow structure is used at the feeding end to allow the material to overflow and fall vertically to the punch plate to avoid changes in the impact angle when the material flow is unstable, which affects the measurement accuracy. The discharge end adopts an active exhaust method to reduce the impact of the external airflow on the discharge end.

[0025] 3. A single cantilever beam strain sensor imported from Germany is used. This sensor has almost no displacement when reaching the full scale, and the sensor itself is a fully sealed structure.

[0026] 4. Dynamic compensation is performed by software, that is, the manufacturing and processing errors and application limitations caused by the use of mechanical structures are eliminated. Therefore, this solution is particularly suitable for metering in the process of gas-solid two-phase material transportation.

[0027] 5. In terms of subsequent signal processing, PLC is used as the core component to replace the traditional single-chip microcomputer. The flexibility of on-site application is very large, and it has advantages in network connection, multi-interface data exchange, and logical control of switching quantity. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a cross-sectional view of the utility model.

[0029] Figure 2 It is a side view of the utility model.

[0030] Figure 3 It is a top view of the utility model.

[0031] Figure markings: 1. feed port, 2. inspection port, 3. air permeable plate, 4. compressed air interface for draining, 5. air supply port, 6. discharge port, 7. punch plate, 8. spray nozzle, 9. punch plate support, 10. connecting arm, 11. control box, 12. single cantilever beam sensor, 13. sensor seat, 14. sensor mounting base, 15. first exhaust port, 16. second exhaust port, 17. left inspection door, 18. right inspection door, 19. upper inspection door, 20. feed buffer box, 21. partition, 22. shell. DETAILED DESCRIPTION

[0032] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The embodiments described are given in the drawings. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thoroughly and comprehensively understood.

[0033] The single cantilever beam strain sensor in this embodiment is a single cantilever beam strain sensor imported from Germany. This sensor has almost no displacement when reaching the full scale, and the sensor itself is a fully sealed structure;

[0034] The PLC controller used in this embodiment is of conventional type, and the manner in which it controls components complies with the standards of the prior art.

[0035] like Figure 1-Figure 3 As shown, a bulk solid particle material flow meter includes a shell 22, a feed port 1 is provided on the left side of the shell 22, and a discharge port 6 is provided at the lower right side of the shell 22, and a feed buffer box 20 is also included. A partition 21 is provided inside the feed buffer box 20, and the partition 21 divides the feed buffer box 20 into two interconnected drop chambers and a boiling chamber, the feed port 1 is connected to the top of the drop chamber, and a spray nozzle 8 is connected to one side of the boiling chamber, and a single cantilever beam sensor 12 is installed below the upper cover of the shell 22. The single cantilever beam sensor 12 is connected to the punch plate 7 through the connecting arm 10 and the punch plate support 9, and the upper part of the punch plate 7 corresponds to the cross-section of the spray nozzle 8. The bottom of the feed buffer box 20 is provided with a breathable plate 3, and the bottom side of the shell 22 is connected to the air supply port 5, and the air supply port 5 is located below the breathable plate 3. The first exhaust port 15 and the second exhaust port 16 are arranged in parallel above the upper cover of the shell 22, and the control box 11 is connected to the notch of the shell 22, and a PLC is arranged inside the control box 11.

[0036] An inspection port 2 is provided on one side of the housing 22, and a compressed air interface 4 is connected to the bottom edge of the housing 22. The single cantilever beam sensor 12 is installed below the upper cover of the housing 22 through a sensor seat 13 and a sensor mounting base 14. A left inspection door 17, a right inspection door 18 and an upper inspection door 19 are also included. The left inspection door 17, the right inspection door 18 and the upper inspection door 19 are installed on both sides and the top of the housing 22, respectively.

[0037] The device is specially equipped with a buffer pneumatic overflow structure at the feeding end, including a feeding buffer box 20 and a spray nozzle 8. This design allows the material to be measured to vertically and stably impact the punch plate 7 after overflowing, avoiding additional impact force changes caused by unstable airflow, thereby ensuring stable and reliable measurement accuracy. At the discharging end, an active exhaust method is used to reduce the impact of external airflow on the discharging end.

[0038] In addition, the device uses PLC for signal processing, and its application not only improves the flexibility of on-site applications, but also shows advantages in network connection, multi-interface data exchange, and logical control of switching quantities.

[0039] When in use, the momentum principle is used to measure the flow of freely falling powder or granular media.

[0040] First, the material to be tested enters the feed buffer box 20 through the feed port 1. The feed buffer box 20 is provided with a partition 21 to divide it into two independent parts. The bottom of the feed buffer box 20 is equipped with a breathable plate 3, and the lower air supply port 5 supplies high-pressure air (the pressure range is set to 8-10KPa). This design allows the material to be tested to present a fluidized state in the feed buffer box 20, that is, the particles of the material to be tested on the breathable plate reach a state similar to water due to the air flow. As the material from the feed port continues to enter, it will naturally overflow from the feed buffer box 20 and enter the spray nozzle 8, and then impact the inclined punch plate 7. The punch plate 7 is installed at a 45-degree angle to the horizontal direction. This design allows the material to be tested to generate a horizontal component force when it impacts.

[0041] This horizontal force component is transmitted to the detection end, i.e., the force-bearing end, of the single cantilever beam sensor 12 through the connecting arm 10. When the sensor is subjected to force, it will deform and thus generate a signal that changes in proportion to the deformation. This signal represents the flow information of the material to be measured, thereby realizing the flow measurement.

[0042] In addition, the gas brought out by the material to be tested sprayed from the spray nozzle 8 and the gas entering due to the rear conveying system after the material to be tested is discharged can be smoothly discharged through the exhaust port above the punch plate 7.

[0043] In terms of subsequent signal processing, the device uses advanced PLC as the core component to replace the traditional single-chip microcomputer. When programming the software inside the PLC, a series of operations can be preset, including the use of a new algorithm to realize the software-based dynamic compensation function. Through precise algorithm design and software dynamic compensation technology, it can achieve a measurement accuracy better than 1% in continuous dynamic conditions (relative to measurement in a static state).

[0044] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A bulk solid particulate material flow meter, comprising a housing (22), wherein a feed inlet (1) is provided on the left side of the housing (22), and a discharge outlet (6) is provided at the lower right side of the housing (22), characterized in that: The invention also comprises a feed buffer box (20), wherein a partition (21) is arranged inside the feed buffer box (20), and the partition (21) divides the feed buffer box (20) into two interconnected material drop chambers and a boiling chamber, wherein the feed port (1) is connected to the top of the material drop chamber, and a spray nozzle (8) is connected to one side of the boiling chamber, and a single cantilever beam sensor (12) is installed below the upper cover of the shell (22), and the single cantilever beam sensor (12) is connected to the punching plate (10) through a connecting arm (10) and a punching plate support (9). 7), the top of the punch plate (7) corresponds to the cross-section of the spray nozzle (8), the bottom of the feed buffer box (20) is provided with a breathable plate (3), one side of the bottom of the shell (22) is connected to an air supply port (5), and the air supply port (5) is located below the breathable plate (3), a first exhaust port (15) and a second exhaust port (16) are arranged in parallel above the upper cover of the shell (22), and a control box (11) is connected to the notch of the shell (22), and a PLC is arranged inside the control box (11).

2. The bulk solid particulate material flow meter according to claim 1, characterized in that: An inspection port (2) is provided on one side of the shell (22), and a compressed air interface (4) for draining blockage is communicated with the bottom edge of the shell (22).

3. The bulk solid particulate material flow meter according to claim 1, characterized in that: The single cantilever beam sensor (12) is installed below the upper cover of the housing (22) via a sensor seat (13) and a sensor mounting base (14).

4. The bulk solid particulate material flow meter according to claim 1, characterized in that: It also includes a left inspection door (17), a right inspection door (18) and an upper inspection door (19).

5. The bulk solid particle flow meter according to claim 4, characterized in that: The left inspection door (17), the right inspection door (18) and the upper inspection door (19) are respectively installed on both sides and the top of the housing (22).

6. The bulk solid particulate material flow meter according to claim 1, characterized in that: The punch plate (7) forms an angle of 45 degrees with the horizontal direction.

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