Weightlessness scale pressure fluctuation compensation device and method

Abstract

The invention discloses a weightlessness scale pressure fluctuation compensation device and method. The weightlessness scale pressure fluctuation compensation device comprises a weightlessness scale, a mounting base, a receiving reaction kettle, a discharging flexible connector and a compensation flexible connector, the weightlessness scale is provided with a weightlessness scale feed port and a weightlessness scale discharge port; the weightlessness scale is mounted on the mounting base; an air pressure balance fixing plate is fixedly connected to the mounting base; one end of the discharge flexible connector is connected with the weightlessness scale discharge port, and the other end is connected with the receiving reaction kettle; one end of the compensation flexible connector is connected with the weightlessness scale discharge port, and the other end is connected with the air pressure balance fixing plate; and the effective action area of the discharge flexible connection is equal to that of the compensation flexible connection. Pressure fluctuation in the reaction kettle in the feeding and conveying process of the weightlessness scale is eliminated, and it is guaranteed that measurement data of a weighing sensor of the weightlessness scale are accurate.

Description

Technical Field

[0001] This invention belongs to the field of loss-in-weight scale applications and relates to a pressure fluctuation compensation device and method for loss-in-weight scales. Background Technology

[0002] A loss-in-weight weigher is a dynamic weighing device that controls the material conveying rate by monitoring changes in material weight in real time. It is widely used in industries such as chemical, food, and pharmaceutical. After the loss-in-weight weigher conveys the material to the reaction vessel, it undergoes thorough mixing inside. During this process, due to the physical and chemical reactions of the material, pressure fluctuations occur within the reaction vessel. When the gas inside the reaction vessel cannot be directly discharged, the fluctuating pressure causes deviations in the measurement data of the weighing sensor, thereby reducing the measurement accuracy and system stability of the loss-in-weight weigher. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a pressure fluctuation compensation device and method for a loss-in-weight scale, which eliminates pressure fluctuations in the reactor during the feeding and conveying process of the loss-in-weight scale and ensures the accuracy of the measurement data of the weighing sensor of the loss-in-weight scale.

[0004] To achieve the above objectives, the present invention employs the following technical solution: A pressure fluctuation compensation device for a loss-in-weight scale includes a loss-in-weight scale, a mounting base, a receiving reactor, a discharge flexible connection, and a compensation flexible connection. The loss-in-weight scale is equipped with a loss-in-weight inlet and a loss-in-weight outlet; the loss-in-weight scale is installed on a mounting base. A pressure balance plate is fixedly connected to the mounting base; one end of the discharge flexible connection is connected to the discharge port of the loss-in-weight scale, and the other end is connected to the receiving reactor; one end of the compensation flexible connection is connected to the discharge port of the loss-in-weight scale, and the other end is connected to the pressure balance plate; the effective working area of ​​the discharge flexible connection is equal to the effective working area of ​​the compensation flexible connection.

[0005] Preferably, it also includes a fixing plate mounting bracket, and the air pressure balance fixing plate is fixedly connected to the mounting base through the fixing plate mounting bracket.

[0006] Preferably, the discharge flexible connection and the compensation flexible connection are corrugated pipes or flexible fabric sleeves.

[0007] Preferably, it also includes a feed valve and a pneumatic sealing valve, which are connected in series upstream of the feed inlet of the loss-in-weight scale.

[0008] Preferably, it also includes a feed flexible connection, which is located between the pneumatic sealing valve and the feed valve.

[0009] Preferably, it also includes a wear-resistant sealing valve, which is connected upstream of the feed inlet of the loss-in-weight scale.

[0010] Preferably, it also includes a feed flexible connection, which is located between the wear-resistant sealing valve and the feed port of the loss-in-weight scale.

[0011] Preferably, the compensation flexible connection is located at the upper end of the loss-in-weight scale outlet.

[0012] Preferably, both the discharge flexible connection and the compensation flexible connection are connected via flanges.

[0013] A method for compensating for pressure fluctuations in a loss-in-weight scale includes the following steps: The material enters the receiving reactor through the discharge flexible connection from the loss-in-weight scale outlet. The pressure fluctuation in the receiving reactor generates a primary force on the loss-in-weight scale. The pressure fluctuations inside the reactor are received, and a second force is generated on the loss-in-weight scale through the compensation soft connection. The compensation soft connection is located between the discharge port of the loss-in-weight scale and the air pressure balance fixing plate on the mounting base. The second force is transmitted to the mounting base through the compensating flexible connection and the air pressure balance fixing plate; The magnitude of the first force is equal to the magnitude of the second force, but their directions are opposite.

[0014] Compared with the prior art, the present invention has the following beneficial effects: This invention cleverly utilizes the principle of pressure balance by adding a pressure compensation loop connected to a fixed foundation at the discharge port of the loss-in-weight scale. This transfers the pressure fluctuation load from the receiving reactor to the non-weighing section. The loss-in-weight scale is sealed as a whole by a pneumatic sealing valve, ensuring internal pressure self-balancing and preventing additional forces on the external weighing sensor. Thus, together with the pressure compensation loop, this factor completely eliminates interference with weighing accuracy, significantly improving the metering stability and reliability of the loss-in-weight scale in a closed, pressurized environment. Simultaneously, the low-rigidity flexible connection design effectively isolates mechanical vibration and installation stress, further ensuring high measurement accuracy. This invention features a reasonable structural design, flexible installation, and allows for selection of different feed valve configurations according to various operating conditions, making it highly valuable for industrial applications. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the pressure fluctuation compensation device for the loss-of-weight scale according to Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the loss-in-weight scale structure according to Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the feeding structure in Embodiment 2 of the present invention.

[0016] The components are: 1. Loss-in-weight scale; 1-1. Loss-in-weight scale inlet; 1-2. Loss-in-weight scale outlet; 2. Mounting base; 2-1. Fixing plate mounting bracket; 3. Receiving reactor; 4. Pneumatic sealing valve; 5. Feeding flexible connection; 6. Feeding valve; 7. Discharge flexible connection; 8. Compensation flexible connection; 9. Pneumatic balance fixing plate; 10. Wear-resistant sealing valve. Detailed Implementation

[0017] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0018] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terms “installation,” “connection,” and “linkage” should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection; a mechanical connection, an electrical connection, or a connection that allows communication; a direct connection or an indirect connection via an intermediate medium; or a connection within two elements or an interaction between two elements. The term “and / or” as used herein includes any and all combinations of one or more of the associated listed items. Those skilled in the art will understand the specific meaning of the above terms in this invention according to the specific circumstances. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention.

[0020] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0021] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0022] Example 1 Please see Figure 1 and Figure 2 This invention provides a pressure fluctuation compensation device for loss-in-weight scales. This device is mainly used in chemical and pharmaceutical industries where continuous, high-precision feeding is required in closed pressure vessels such as receiving reactors.

[0023] like Figure 1 As shown, the compensation device in this embodiment includes a weighing system and a pressure compensation system.

[0024] The main body of the weighing system is the loss-in-weight scale 1, whose scale body is mounted on a fixed base 2 on the ground via a load cell (not shown in the diagram). The mounting base 2 provides stable support for the entire device. The loss-in-weight scale 1 itself includes standard components such as a weighing hopper for storing and discharging materials and a screw feeder.

[0025] The material flow path from top to bottom is as follows: the external silo (not shown in the diagram) is connected to the inlet 1-1 of the loss-in-weight scale 1 via the feed valve 6, the first-stage feed flexible connection 5, and the pneumatic sealing valve 4. The outlet 1-2 of the loss-in-weight scale 1 is connected to the inlet of the downstream receiving reactor 3 via the discharge flexible connection 7.

[0026] The core components of the pressure compensation system are the air pressure balance fixing plate 9 and the compensation flexible connection 8. The air pressure balance fixing plate 9 is a rigid component, which is firmly installed on the mounting base 2 via the fixing plate mounting bracket 2-1. Therefore, it is a non-weighing part, and its position is fixed. One end of the compensation flexible connection 8 is connected to the upper end of the discharge port 1-2 of the loss-in-weight scale, and the other end is connected to the air pressure balance fixing plate 9.

[0027] To ensure the airtightness of the entire system and isolate the effects of external vibrations and stresses on the weighing system, the feed flexible connection 5, discharge flexible connection 7, and compensation flexible connection 8 are preferably made of bellows or flexible fabric sleeves with low longitudinal and transverse stiffness, and connected by flanges. Sealing gaskets are used between the flanges to ensure reliable airtightness, prevent material or gas leakage, and allow for fine-tuning of the installation state of the flexible connections by increasing or decreasing the number of gaskets, keeping them in a naturally relaxed state without pre-stress, thus minimizing additional force interference to the load cells of the loss-in-weight scale 1.

[0028] The working process and compensation principle of the pressure fluctuation compensation device for loss-in-weight scales are as follows: Feeding Process: When the loss-in-weight scale 1 needs to be replenished, the control system opens and closes the valves according to a preset logic sequence. First, the pneumatic sealing valve 4 opens, then the feed valve 6 opens, and the material from the external hopper enters the weighing hopper of the loss-in-weight scale 1 under gravity. After replenishment, the control system first closes the feed valve 6 to cut off the material flow, and then closes the pneumatic sealing valve 4, completing a sealed replenishment process. This dual-valve timing control is equivalent to forming a simple airlock device, effectively ensuring at a low cost that the pressure inside the receiving reactor 3 will not be transmitted upwards to the external hopper through the loss-in-weight scale 1 at the moment of replenishment, maintaining the overall sealing of the system.

[0029] Discharge and pressure compensation process: The loss-in-weight scale 1 starts its feeding mechanism to deliver material to the receiving reactor 3 according to the set loss rate. After the material enters the reactor 3, chemical reactions or physical state changes such as dissolution and heating may occur, causing fluctuations in the gas pressure inside the reactor 3.

[0030] Compensation Principle Analysis: Without the compensation structure of this invention, the pressure P inside the reactor 3 will act on the cross-section of the discharge port 1-2 of the loss-in-weight scale through the discharge flexible connection 7. If the effective area of ​​the discharge flexible connection 7 is A1, then this pressure will generate a vertically upward thrust F1=P×A1 on the scale body of the loss-in-weight scale 1. This force will be directly detected by the load cell, manifesting as a reduction in the weight of the scale, thus causing distortion of the weighing data. The controller will misjudge the rate of weight loss, affecting the feeding accuracy.

[0031] In the present invention, the situation changes due to the presence of the compensating flexible connection 8 and the pressure balance fixing plate 9. The pressure P inside the reactor 3 not only acts on the discharge flexible connection 7, but is also completely transmitted to the entire internal space of the loss-in-weight scale discharge port 1-2, and acts on the compensating flexible connection 8 at its upper end. If the effective working area of ​​the compensating flexible connection 8 is A2, then this pressure will generate a vertically downward pressure F2=P×A2 on the scale body of the loss-in-weight scale 1.

[0032] Furthermore, this downward force F2 is not transmitted to the ground, but is transmitted to the air pressure balance fixing plate 9 through the compensation flexible connection 8, and finally transmitted to the stable mounting base 2 through the fixing plate mounting bracket 2-1.

[0033] Through careful design, the effective working areas of the discharge flexible connection 7 and the compensation flexible connection 8 are equal, i.e., A1=A2. In this way, the upward thrust F1 and the downward pressure F2 generated by the pressure P acting on the scale body of the loss-in-weight scale 1 are equal in magnitude and opposite in direction, thus canceling each other out. Therefore, regardless of the pressure fluctuations within the receiving reactor 3, the resultant force generated by it on the weighing system is always zero or close to zero. The load caused by pressure fluctuations is successfully transferred through the compensation circuit (compensation flexible connection 8 - air pressure balance fixing plate 9 - mounting base 2), thereby eliminating its impact on the weighing accuracy.

[0034] In addition, the air pressure balance fixing plate 9 is very flexible in its installation. In addition to being connected to the mounting base 2 as shown in the figure, it can also be directly connected to any stable fixed base such as the workshop floor, column or load-bearing platform through other customized brackets according to the actual site conditions, which enhances the site adaptability of this device.

[0035] Example 2 Please see Figure 3 This embodiment is another optional configuration proposed for the feeding section.

[0036] In this embodiment, the structure of the feeding system is simplified. The dual valve combination of pneumatic sealing valve 4 and feed valve 6 in Embodiment 1 is eliminated and replaced with a more integrated and superior wear-resistant sealing valve 10.

[0037] The wear-resistant sealing valve 10 is directly connected to the feed inlet 1-1 of the loss-in-weight scale via the feed flexible connection 5. It possesses both precise control over material flow and excellent airtightness, capable of withstanding a certain pressure difference. When handling highly abrasive materials or requiring a higher sealing level, this single-valve solution simplifies the system structure and control logic, while also providing a longer service life and more reliable sealing. Of course, the feed flexible connection 5 remains between it and the loss-in-weight scale 1, maintaining its core function of isolating vibration and stress to ensure weighing accuracy.

[0038] In summary, this invention cleverly utilizes the principle of pressure balance by adding a pressure compensation loop connected to a fixed foundation at the discharge port of the loss-in-weight scale. This transfers the pressure fluctuation load from the receiving reactor to the non-weighing part, thereby completely eliminating the interference of this factor on weighing accuracy and significantly improving the metering stability and reliability of the loss-in-weight scale in a closed, pressurized environment. Simultaneously, the low-rigidity flexible connection design employed in the scheme effectively isolates mechanical vibration and installation stress, further ensuring high measurement accuracy. This invention features a reasonable structural design, flexible installation, and allows for selection of different feed valve configurations according to different operating conditions, making it highly valuable for industrial applications.

[0039] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0040] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0041] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0042] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0043] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

[0044] It should be understood that the above description is for illustrative purposes and not for limitation. Many embodiments and applications beyond the provided examples will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of this patent should not be determined by reference to the above description, but rather by reference to the foregoing claims and the full scope of their equivalents. For purposes of completeness, all articles and references, including patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the foregoing claims is not intended as a waiver of that subject matter, nor should it be construed as an indication that the applicant has not considered that subject matter as part of the disclosed inventive subject matter.

Claims

1. A pressure fluctuation compensation device for a loss-in-weight scale, characterized in that, It includes a loss-in-weight scale (1), a mounting base (2), a receiving reactor (3), a discharge flexible connection (7), and a compensation flexible connection (8); The loss-in-weight scale (1) is provided with a loss-in-weight scale inlet (1-1) and a loss-in-weight scale outlet (1-2); the loss-in-weight scale (1) is installed on the mounting base (2); A pressure balance plate (9) is fixedly connected to the mounting base (2); one end of the discharge flexible connection (7) is connected to the discharge port (1-2) of the loss-in-weight scale, and the other end is connected to the receiving reactor (3); one end of the compensation flexible connection (8) is connected to the discharge port (1-2) of the loss-in-weight scale, and the other end is connected to the pressure balance plate (9); the effective working area of ​​the discharge flexible connection (7) is equal to the effective working area of ​​the compensation flexible connection (8).

2. The pressure fluctuation compensation device for the loss-in-weight scale according to claim 1, characterized in that, It also includes a fixed plate mounting bracket (2-1), and the air pressure balance fixed plate (9) is fixedly connected to the mounting base (2) through the fixed plate mounting bracket (2-1).

3. The pressure fluctuation compensation device for the loss-in-weight scale according to claim 1, characterized in that, The discharge flexible connection (7) and the compensation flexible connection (8) are corrugated pipes or flexible fabric sleeves.

4. The pressure fluctuation compensation device for the loss-in-weight scale according to claim 1, characterized in that, It also includes a feed valve (6) and a pneumatic sealing valve (4), which are connected in series upstream of the feed inlet (1-1) of the loss-in-weight scale.

5. The pressure fluctuation compensation device for the loss-in-weight scale according to claim 4, characterized in that, It also includes a feed flexible connection (5), which is connected between the pneumatic sealing valve (4) and the feed valve (6).

6. The pressure fluctuation compensation device for the loss-in-weight scale according to claim 1, characterized in that, It also includes a wear-resistant sealing valve (10), which is connected upstream of the loss-in-weight scale inlet (1-1).

7. The pressure fluctuation compensation device for a loss-in-weight scale according to claim 6, characterized in that, It also includes a feed flexible connection (5), which is connected between the wear-resistant sealing valve (10) and the loss-in-weight scale feed port (1-1).

8. The pressure fluctuation compensation device for the loss-in-weight scale according to claim 1, characterized in that, The compensation flexible connection (8) is connected to the upper end of the discharge port (1-2) of the loss-in-weight scale.

9. The pressure fluctuation compensation device for a loss-in-weight scale according to claim 1, characterized in that, Both the discharge flexible connection (7) and the compensation flexible connection (8) are connected by flanges.

10. A method for compensating pressure fluctuations in a loss-in-weight scale based on the device described in any one of claims 1-9, characterized in that, Includes the following processes: The material enters the receiving reactor (3) through the discharge flexible connection (7) from the loss-in-weight scale (1) discharge port (1-2). The pressure fluctuation in the receiving reactor (3) generates a first force on the loss-in-weight scale (1). The pressure fluctuations inside the reactor (1) are received and a second force is generated on the loss-in-weight scale (1) through the compensation soft connection (8). The compensation soft connection (8) is connected between the loss-in-weight scale outlet (1-2) and the air pressure balance fixing plate (9) on the mounting base (2). The second force is transmitted to the mounting base (2) through the compensating flexible connection (8) and the air pressure balance fixing plate (9); The magnitude of the first force is equal to the magnitude of the second force, but their directions are opposite.

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