On-line dry powder bag leak hunting device

Abstract

An online dry powder bag leak detection device includes: an adjustable clamp, a spacing positioning component, a pressure gauge, a pressure tube, and a pressure tapping tube. The adjustable clamp includes first and second pressure plates arranged in parallel, connected by an adjustable connector, and the spacing between the two pressure plates is adjustable. A slot is provided on the first pressure plate. The online dry powder bag is placed between the two pressure plates, with the online connector located in the slot and protruding upwards from the first pressure plate. The spacing positioning component includes a positioning body and spacing positioning platforms of different thicknesses disposed on the positioning body. The spacing positioning platforms can be inserted between the first and second pressure plates to position the spacing between them. One end of the pressure tube is connected to an external air source, and the other end is connected to the liquid inlet pipe of the online connector. One end of the pressure tapping tube is connected to the liquid outlet pipe of the online connector, and the other end is connected to a pressure sensor. This invention improves the accuracy and ease of operation for leak detection of online dry powder bags with welded online connectors.

Description

Technical Field

[0001] This utility model belongs to the field of testing equipment technology, specifically relating to a leak detection device for online dry powder bag sealing testing. Background Technology

[0002] Hemodialysis requires dialysate, which is prepared by adding hemodialysis concentrate to a specific container. Currently, hemodialysis concentrate is mainly divided into two types: solid powder and liquid. When using solid powder hemodialysis concentrate online, the connector of the packaging bag containing solid powder such as bicarbonate concentrate is connected to the connector on the dialysis machine. Dialysis water is then injected into the packaging bag to dissolve the dialysis powder and prepare the dialysate for dialysis treatment. During the manufacturing process of solid powder for online use, the packaging bags need to be quality inspected to ensure proper sealing.

[0003] The traditional method for leak testing of dry powder bags is immersion testing: the dry powder bag is immersed in alcohol, then air is injected into the bag, and the presence of air bubbles around the bag is observed to determine whether the dry powder bag is sealed securely and without leakage. This leak detection method has the following problems in actual production: 1) 95% ethanol is used as the immersion solution on site. During the leak detection operation, the alcohol is exposed in the container for a long time and is easy to volatilize, which can easily cause static electricity fire accidents and poses a great safety hazard; 2) The next step after the leak detection is labeling. Because the bag is immersed in alcohol, the outer surface of the bag is wet. Before labeling, the outer surface needs to be wiped manually and dried before labeling can be done, which is inefficient and wastes manpower; 3) When using the online dry powder bag, it is connected to the dialysis machine through the online connector. The online connector is irregular in shape and large in volume. It is not easy to adjust the direction and height of the dry powder bag with the online connector in the alcohol. Therefore, the existing leak detection method is usually to test the dry powder bag without the online connector. The connection port of the dry powder bag is facing upward and the sealing edge of the bag is immersed in alcohol. Then, air is vented into the bag through the connection port. This leak detection method cannot test the dry powder bag with the online connector and cannot detect whether the weld between the bag body and the online connector is firm and leak-free. Utility Model Content

[0004] The purpose of this invention is to provide an online dry powder bag leak detection device with high detection efficiency and comprehensive detection of the sealing performance of online dry powder bags.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An online dry powder bag leak detection device includes: an adjustable clamp, a spacing positioning component, a pressure gauge, a pressure tube, and a pressure tapping tube. The pressure gauge includes a pressure sensor. The adjustable clamp includes a first pressure plate and a second pressure plate arranged in parallel, connected by an adjustable connector, and the spacing between the first and second pressure plates is adjustable. A slot is provided on the first pressure plate. The bag body of the online dry powder bag is placed between the first and second pressure plates, and the online connector of the online dry powder bag is located in the slot and protrudes upward from the first pressure plate. The spacing positioning component includes a positioning component body and spacing positioning platforms of different thicknesses disposed on the positioning component body. The spacing positioning platforms can be inserted between the first and second pressure plates to position the spacing between the first and second pressure plates. One end of the pressure tube is connected to an external air source, and the other end is connected to the liquid inlet pipe of the online connector. One end of the pressure tapping tube is connected to the liquid outlet pipe of the online connector, and the other end is connected to the pressure sensor.

[0007] In some embodiments, the first pressure plate and the second pressure plate are rectangular steel plates, and the slot extends inward from one side of the first pressure plate in the width direction, and the length of the slot is at least half the width of the first pressure plate.

[0008] In some embodiments, the slot is a rectangular slot, and the closed end of the slot is arc-shaped.

[0009] In some embodiments, the surfaces of the first pressure plate located on both sides of the slot are provided with downwardly recessed grooves, and the sidewall of the slot forms a limiting engagement portion protruding toward the center of the slot, the limiting engagement portion limiting the connection connector in a direction perpendicular to the first pressure plate.

[0010] In some embodiments, the adjustable connector includes a bolt and a fixing nut disposed on the bolt. The bolt is connected to the four corners of the first pressure plate and the second pressure plate. The second pressure plate is provided with a threaded hole that mates with the bolt. The first pressure plate is provided with a through hole for the bolt to pass through. The fixing nut is located on both sides of the first pressure plate.

[0011] In some embodiments, the positioning component body is a cuboid, and the spacing positioning platform includes a first spacing positioning platform, a second spacing positioning platform, and a third spacing positioning platform. The first spacing positioning platform is disposed on the front side of the positioning component body, and the second spacing positioning platform and the third spacing positioning platform are respectively disposed on the two sides of the positioning component body.

[0012] In some embodiments, the bottom surfaces of the spacing positioning platform are located on the same plane.

[0013] In some embodiments, the distance between the bottom surface of the spacing positioning platform and the bottom surface of the positioning body corresponds to the thickness of the second pressure plate.

[0014] In some embodiments, a rope-threading hole is provided at the top of the positioning member body.

[0015] In some embodiments, the pressure sensor is a capacitive differential pressure sensor.

[0016] As can be seen from the above technical solution, this utility model uses an adjustable clamp to load the online dry powder bag to be tested. The bag body is located between two pressure plates of the adjustable clamp. The online connector extends upward from the slot of the upper pressure plate of the adjustable clamp. The pressure pipe is connected to the liquid inlet pipe of the online connector, and the pressure tapping pipe is connected to the liquid outlet pipe of the online connector. Gas is injected into the bag body, and the pressure change inside the bag is tested to determine whether there is a leak. Compared with the method of immersion leak detection, the operation is simpler. Moreover, the leak detection result is judged by the pressure measuring instrument, which is more objective and accurate than judging the leak detection result by visually observing whether bubbles are generated. It reduces the misjudgment rate of human observation, avoids the safety risks of alcohol immersion, reduces the process of manually wiping the outer bag with alcohol on the production line, and improves work efficiency. This invention utilizes the inlet pipe of the connecting connector for inflation and the outlet pipe for pressure testing. This allows for the detection of leaks not only in the bag body but also at the welded joints between the connecting connector and the bag body, resulting in more comprehensive and effective leak detection. Furthermore, the adjustable clamp is designed specifically for the structure of the connecting dry powder bag, facilitating the installation and positioning of the bag body and connecting connector, and allowing for easy connection to the pressurization pipe for inflation. During leak detection, the adjustable clamp applies pressure to the bag body, making it more sensitive to even minor leaks. Attached Figure Description

[0017] To more clearly illustrate the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of an online dry powder bag;

[0019] Figure 2 This is a schematic diagram of the structure of the online dry powder bag leak detection device according to an embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the adjustable clamp according to an embodiment of the present invention;

[0021] Figure 4This is a schematic diagram of the spacing positioning component according to an embodiment of the present utility model;

[0022] Figure 5 This is a front view of the spacing positioning component according to an embodiment of the present utility model;

[0023] Figure 6 This is a side view of the spacing positioning component according to an embodiment of the present utility model;

[0024] Figure 7 This is another side view of the spacing positioning component according to an embodiment of the present invention;

[0025] Figure 8 This is a schematic diagram illustrating the use of the spacing positioning component in an embodiment of this utility model;

[0026] Figure 9 This is a schematic diagram illustrating the mounting of the online dry powder bag onto the testing fixture in an embodiment of this utility model;

[0027] Figure 10 for Figure 9 A magnified view of part A in the diagram.

[0028] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Detailed Implementation

[0029] The present invention will now be described in detail with reference to the accompanying drawings. In the detailed description of the embodiments of the present invention, for ease of explanation, the drawings illustrating the device structure will be partially enlarged without adhering to the general scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. It should be noted that the drawings are in a simplified form and use non-precise scales, solely for the purpose of conveniently and clearly illustrating the embodiments of the present invention. Additionally, in the description of this application, terms such as "first" and "second" are used only to distinguish descriptions and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Terms such as "positive," "negative," "bottom," "upper," and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] Online hemodialysis dry powder bags are typically made of polyethylene and contain hemodialysis dry powder composed of sodium chloride, calcium chloride, magnesium chloride, sodium bicarbonate, and other raw materials. During dialysis treatment, the online dry powder bag is connected to the hemodialysis machine, and dialysis water is passed through the bag to dilute the dry powder and prepare the dialysate. Figure 1 As shown, the online dry powder bag includes a bag body 100 and an online connector 101. One end of the online connector 101 is connected to the inside of the bag body 100 through a connection port provided on the bag body 100, and the other end is provided with an inlet pipe 101a and an outlet pipe 101b. The inlet pipe 101a is used to connect dialysis water, and the outlet pipe 101b is used to discharge the prepared dialysis solution. The online dry powder bag is equipped with a component with a one-way valve function, so that the prepared dialysis solution can only flow out from the outlet pipe 101b in one direction. Because the online connector 101 has an irregular shape, it is not convenient to fix and adjust the position of the bag body during the testing process. The existing sealing test of online dry powder bags usually tests the bag body without the online connector welded. After the bag body is tested, the online connector is welded. This makes it impossible to test the sealing performance between the online connector and the bag body, resulting in an incomplete test.

[0032] To address the issues of low efficiency and incomplete detection in existing testing methods, this invention provides a leak detection device for online dry powder bags that can perform leak testing on the sealing performance of online dry powder bags with welded connection joints.

[0033] like Figure 2 As shown, the online dry powder bag leak detection device of this embodiment includes an adjustable clamp 1, a spacing positioning component 2, and a pressure gauge 3. The liquid inlet pipe 101a of the online connector is connected to an external air source through a pressurization pipe 4, and is connected to the pressure gauge 3 through a pressure tapping pipe 5.

[0034] The pressure gauge 3 is used to detect the pressure inside the bag 100. The pressure gauge 3 includes a pressure sensor (not shown) built into it. The pressure sensor is connected to the pressure tapping tube 5 and is used to detect the pressure value of the gas inside the bag 100 obtained by the pressure tapping tube 5. The pressure gauge 3 may also include a display screen 3a, an indicator light 3b, and a PLC module (not shown). The display screen 3a displays the pressure detection value, and the indicator light 3b indicates the detection result, such as a green light for a qualified test and a red light for a failed test. The PLC module compares the pressure detection value with a standard value to determine the detection result. In specific applications, a capacitive differential pressure sensor can be used, with a detection accuracy of 0.5% or higher. The pressure gauge 3 can be a commercially available pressure testing instrument. This invention does not improve the structure of the pressure gauge, as long as it can test gas pressure.

[0035] Reference Figure 2 and Figure 3 The adjustable clamp 1 in this embodiment includes a first pressure plate 1-1, a second pressure plate 1-2, and an adjustable connector 1-3. Both the first pressure plate 1-1 and the second pressure plate 1-2 are rectangular steel plates. The first pressure plate 1-1 and the second pressure plate 1-2 are arranged opposite to each other and parallel to each other, forming a space between them for placing the bag 100. The bag 100 is clamped between the first pressure plate 1-1 and the second pressure plate 1-2. The area of ​​the first pressure plate 1-1 and the second pressure plate 1-2 is larger than the area of ​​the bag 100, and can completely cover the bag 100. The first pressure plate 1-1 and the second pressure plate 1-2 are connected by the adjustable connector 1-3, and the distance between the first pressure plate 1-1 and the second pressure plate 1-2 is adjustable, thereby adapting to different specifications of inline dry powder bags.

[0036] The adjustable connector 1-3 in this embodiment includes bolts 1-3a and fixing nuts 1-3b. Bolts 1-3a are connected to the four corners of the first pressure plate 1-1 and the second pressure plate 1-2. Threaded holes are machined on the second pressure plate 1-2, and the bolts 1-3a and the threaded holes on the second pressure plate 1-2 mate with each other, making the second pressure plate 1-2 a fixing plate. Through holes are machined on the first pressure plate 1-1 for the bolts 1-3a to pass through, allowing the first pressure plate 1-1 to move along the bolts 1-3a, thereby adjusting the distance between the first pressure plate 1-1 and the second pressure plate 1-2. Fixing nuts 1-3b are provided on the bolts 1-3a. After the position of the first pressure plate 1-1 on the bolts 1-3a is adjusted, tightening the fixing nuts 1-3b located on both sides of the first pressure plate 1-1 fixes the position of the first pressure plate 1-1 on the bolts 1-3a, maintaining a constant distance between the first pressure plate 1-1 and the second pressure plate 1-2. When it is necessary to adjust the distance between the two pressure plates, loosen the fixing nut 1-3b to adjust the position of the first pressure plate 1-1.

[0037] The first pressure plate 1-1 has a slot 1-1a for inserting the connecting connector 101. When the bag body 100 is inserted between the first pressure plate 1-1 and the second pressure plate 1-2, the connecting connector 101 is positioned within the slot and protrudes upward from the first pressure plate 1-1 at slot 1-1a. This does not affect the installation of the bag body 100 and facilitates the connection of the pressure tube 4 and the pressure tapping tube 5. In this embodiment, the slot 1-1a extends inward from one side of the first pressure plate 1-1 in the width direction, and the length of the slot 1-1a is at least half the width of the first pressure plate 1-1. The width of the slot 1-1a corresponds to the outer diameter of the connecting connector 101. In this embodiment, the slot is rectangular, and the closed end of the slot is arc-shaped. When the bag body 100 is installed into the adjustable clamp 1, the connecting connector 101 is inserted into the open end of the slot 1-1a and moves along the slot 1-1a. When it moves to the closed end of the slot 1-1a, the bag body 100 is completely located in the space between the two pressure plates, with no exposed parts.

[0038] Furthermore, such as Figure 10 As shown, in this embodiment, the surfaces of the first pressure plate 1-1 located on both sides of the top of the slot 1-1a are machined with downward recessed grooves 1-1b, so that the sidewall of the slot 1-1a forms a limiting engagement part 1-1c protruding towards the center of the slot 1-1a. The thickness of the limiting engagement part 1-1c corresponds to the distance between the elbow of the connecting connector 101 and the surface of the bag body 100. Thus, when the connecting connector 101 is engaged in the slot 1-1a and moves along the slot 1-1a, the elbow of the connecting connector 101 just abuts against the limiting engagement part 1-1c, which can limit the connecting connector 101 and prevent the connecting connector 101 from moving in the direction perpendicular to the pressure plate.

[0039] The spacing positioning element 2 is used to position the distance between the two pressure plates. The number of spacing positioning elements 2 is at least one, and preferably two. In use, the two spacing positioning elements 2 can be symmetrically inserted on opposite sides of the adjustable clamp 1 to horizontally position the first pressure plate, facilitating the adjustment of the distance between the two pressure plates. (Refer to...) Figure 4 , Figure 5 , Figure 6 and Figure 7 The spacing positioning component 2 in this embodiment includes a positioning component body 2-1, a first spacing positioning platform 2-2, a second spacing positioning platform 2-3, and a third spacing positioning platform 2-4. The spacing positioning component 2 has at least two spacing positioning platforms of different thicknesses. The thickness of the spacing positioning platform corresponds to the spacing between two pressure plates during the testing of bags of different sizes. By inserting the spacing positioning platform between the two pressure plates, the spacing between the two pressure plates can be positioned, quickly adjusting the two pressure plates to the required spacing and improving testing efficiency. This embodiment has three spacing positioning platforms, making it suitable for leak detection of three sizes of dry powder bags.

[0040] In this embodiment, the positioning body 2-1 of the spacing positioning component 2 is a cuboid. The first spacing positioning platform 2-2 is disposed on the front of the positioning body 2-1, and the second spacing positioning platform 2-3 and the third spacing positioning platform 2-4 are respectively disposed on the two sides of the positioning body 2-1. Each spacing positioning platform protrudes from the surface of its respective positioning body. In this embodiment, the thickness d1 of the first spacing positioning platform 2-2 is the smallest, the thickness d3 of the third spacing positioning platform 2-4 is the largest, and the thickness of the second spacing positioning platform 2-2 is d2, where d1 < d2 < d3. The surface of the spacing positioning platform can be marked to correspond to different specifications of dry powder bags for easy identification.

[0041] Furthermore, the bottom surfaces of each spacing positioning platform are located on the same plane, and the distance d between the bottom surface of the spacing positioning platform and the bottom surface of the positioning component body 2-1 corresponds to the thickness of the second pressure plate 1-2. Therefore, when adjusting the spacing between the two pressure plates, the spacing positioning component 2 can be placed directly on the plane where the second pressure plate 1-2 is located, and then the corresponding spacing positioning platform 2-3 can be inserted between the two pressure plates. Figure 8 As shown, the bottom surface of the spacing positioning platform can be placed on the second pressure plate 1-2. Then, adjust the first pressure plate 1-1 to a suitable position, that is, the first pressure plate 1-1 is pressed against the top surface of the spacing positioning platform, and tighten the fixing nut 1-3b.

[0042] Preferably, to facilitate the use of the spacing positioning component 2, a rope hole 2-1a can be machined on the top of the positioning component body 2-1. The rope passes through the rope hole 2-1a and can be tied to the bolt 1-3a. This prevents the spacing positioning component 2 from being lost and makes it easy to find during use without affecting its operation. The spacing positioning component 2 can slide along the periphery of the second pressure plate 1-2 and can be inserted into any position between the peripheries of the two pressure plates to achieve spacing positioning at all positions of the two pressure plates. The corresponding fixing nuts 1-3b are adjusted to fix the spacing, avoiding uneven spacing between the two pressure plates and ensuring consistent pressure applied to all parts of the inflated dry powder bag.

[0043] The operation method of the online dry powder bag leak detection device of this embodiment will be described below with reference to the accompanying drawings.

[0044] After adjusting the distance between the two pressure plates according to the specifications of the online dry powder bag, place the bag body 100 between the two pressure plates. Once the distance between the two pressure plates is adjusted, the two pressure plates can exert appropriate pressure on the inflated bag body.

[0045] Connect the pressurizing pipe 4 to the inlet pipe 101a of the connection connector 101, and connect the pressure tapping pipe 5 to the outlet pipe 101b of the connection connector 101. With the pressurizing pipe 4 connected to the inlet pipe 101a, compressed air is introduced into the bag body 100 through the inlet pipe 101a, which prevents compressed air from entering through the outlet pipe 101b and damaging the one-way valve components inside the bag body 100.

[0046] The external compressed air source is activated, and compressed air (0.05MPa) is injected into the bag body 100 through the pressurization pipe 4 and the liquid inlet pipe 101a. After inflation, the bag body 100 is pressurized on both sides by the pressure plates. Compressed air is continuously injected until the preset pressure value is reached, and then the pressure is maintained for a period of time, such as 10 seconds. The pressure sensor detects the gas pressure inside the bag body 100 through the pressure tapping pipe 5. The detected pressure value is transmitted to the PLC module. The PLC module compares the pressure sensor's detection value with the standard value. If the detection value is within the standard value range, it means that there is no leakage in all parts of the online dry powder bag, including the bag body 100 and the welded joint between the bag body 100 and the online connector 101, and it is judged as qualified. If the detection value is not within the standard value range, it means that there is a leakage point, and it is judged as unqualified. The indicator light emits a signal to indicate that the currently tested dry powder bag is unqualified. The standard value is obtained by pre-sampling and testing, and the standard value is determined by testing qualified dry powder bags without leakage.

[0047] This utility model's online dry powder bag leak detection device detects the bag's seal by inflating and pressurizing it, then measuring the pressure drop. It requires no immersion liquid and is simple and convenient to operate. During leak detection, the distance between the two pressure plates of the adjustable clamp is adjusted and fixed to ensure consistent pressure expansion deformation of bags of the same specifications for each test. The reaction forces on both sides of the bag are consistent, improving the accuracy of batch pressure testing. Furthermore, because the inflated bag is subjected not only to atmospheric pressure but also to the reaction pressure of the pressure plates, it is more sensitive and accurate in detecting even minor leaks. A slot on the first pressure plate exposes the online connector to the outside of the adjustable clamp, facilitating connection of the pressure tapping and pressurizing pipes and simplifying the inflation process. In a preferred embodiment, grooves are machined on both sides of the slot to form a limiting snap-fit ​​part. The limiting snap-fit ​​part can be snapped between the elbow body and the bag body to limit the connection connector, so that it cannot move in the direction perpendicular to the slot. This is beneficial to fix the connection connector when the liquid inlet pipe is pressurized with air, and avoids the force of high pressure gas entering the connection connector from breaking it, thus preventing damage to the connection connector and its welded joint with the bag body.

[0048] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An online dry powder bag leak detection device, characterized in that, include: Adjustable clamp, spacing positioning component, pressure gauge, pressure tube and pressure tapping tube, wherein the pressure gauge includes a pressure sensor; The adjustable clamp includes a first pressure plate and a second pressure plate arranged in parallel. The first pressure plate and the second pressure plate are connected by an adjustable connector, and the distance between the first pressure plate and the second pressure plate is adjustable. A slot is provided on the first pressure plate. The bag body of the online dry powder bag is placed between the first pressure plate and the second pressure plate, and the online connector of the online dry powder bag is located in the slot and protrudes upward from the first pressure plate. The spacing positioning component includes a positioning component body and spacing positioning platforms of different thicknesses disposed on the positioning component body. The spacing positioning platforms can be inserted between the first pressure plate and the second pressure plate to position the spacing between the first pressure plate and the second pressure plate. One end of the pressurizing tube is connected to an external air source, and the other end is connected to the liquid inlet tube of the connecting connector. One end of the pressure tapping tube is connected to the liquid outlet tube of the connecting connector, and the other end is connected to the pressure sensor.

2. The online dry powder bag leak detection device as described in claim 1, characterized in that: The first pressure plate and the second pressure plate are rectangular steel plates. The slot extends inward from one side of the first pressure plate in the width direction, and the length of the slot is at least half the width of the first pressure plate.

3. The online dry powder bag leak detection device as described in claim 2, characterized in that: The slot is a rectangular slot, and the closed end of the slot is arc-shaped.

4. The online dry powder bag leak detection device as described in claim 1, characterized in that: The first pressure plate has downward recessed grooves on the surfaces on both sides of the slot, and the sidewall of the slot forms a limiting engagement part protruding towards the center of the slot. The limiting engagement part limits the connection connector in a direction perpendicular to the first pressure plate.

5. The online dry powder bag leak detection device as described in claim 1, characterized in that: The adjustable connector includes bolts and fixing nuts disposed on the bolts. The bolts are connected to the four corners of the first pressure plate and the second pressure plate. The second pressure plate is provided with threaded holes that mate with the bolts. The first pressure plate is provided with through holes through which the bolts pass. The fixing nuts are located on both sides of the first pressure plate.

6. The online dry powder bag leak detection device as described in claim 1, characterized in that: The main body of the positioning component is a cuboid, and the spacing positioning platform includes a first spacing positioning platform, a second spacing positioning platform, and a third spacing positioning platform. The first spacing positioning platform is disposed on the front of the main body of the positioning component, and the second spacing positioning platform and the third spacing positioning platform are respectively disposed on the two sides of the main body of the positioning component.

7. The online dry powder bag leak detection device as described in claim 1 or 6, characterized in that: The bottom surfaces of the spacing positioning platforms are located on the same plane.

8. The online dry powder bag leak detection device as described in claim 1 or 6, characterized in that: The distance between the bottom surface of the spacing positioning platform and the bottom surface of the positioning component body corresponds to the thickness of the second pressure plate.

9. The online dry powder bag leak detection device as described in claim 1, characterized in that: The top of the positioning component has a rope threading hole.

10. The online dry powder bag leak detection device as described in claim 1, characterized in that: The pressure sensor is a capacitive differential pressure sensor.

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