Bag-in-bag-out weighing enclosure

Abstract

The utility model discloses a bag into bag out weighing cover, wherein, bag into bag out weighing cover includes the cabinet that is provided with the weighing space, with the cabinet intercommunication setting box, install in the filter of box, and set up in the fan module of box away from the cabinet one side, the box is provided with the opening for installing the filter, and the opening cooperation is provided with the connecting sleeve that can make the sealed bag suit to be located at its outside and the cover shell that can cover and set the connecting sleeve, the connecting sleeve is provided with at least two sealing sites, and with the cover shell between formation has the accommodation space that can accommodate sealed bag. When replacing filter, first through the first sealed bag and take out the filter located in the box, then through the second sealed bag and install new filter. In the replacement process, the opening of box and old filter are in sealed state all the time, so secondary pollution will not be produced, reduces the security risk, guarantees the whole process protection to personnel and environment.

Description

Technical Field

[0001] This utility model belongs to the field of weighing technology, specifically relating to a bag-in-bag-out weighing cover. Background Technology

[0002] When weighing highly reactive and toxic substances such as OEB3 / OEB4 / OEB5 in the laboratory, strict protection of the occupational health and environmental safety of laboratory personnel is essential. Currently, the commonly used technical solution is to operate within a protective weighing enclosure. This enclosure is equipped with a fan module and a high-efficiency filter at the top. The fan maintains a certain negative pressure environment inside the enclosure by drawing air upwards, effectively preventing the leakage of toxic substances. Simultaneously, volatile harmful substances are adsorbed by the high-efficiency filter, reducing the risk of leakage and providing basic safety protection for operators.

[0003] However, this technical solution has a significant drawback: its top filter module uses an open design, which means that when the HEPA filter is replaced, the filter, which has already adsorbed a large amount of harmful substances, is directly exposed to the air. This process may cause the harmful substances to spread, resulting in serious secondary pollution of the laboratory environment and posing a significant threat to the occupational health of operators.

[0004] Therefore, in order to address the aforementioned technical problems, it is necessary to provide a bag-in-bag-out weighing cover. Utility Model Content

[0005] The purpose of this invention is to provide a bag-in-bag-out weighing cover that can solve the problem mentioned above where the cover may cause secondary pollution to the laboratory environment when the filter is replaced due to exposure to air.

[0006] To achieve the above objectives, a specific embodiment of this utility model provides a bag-in, bag-out weighing cover, the technical solution of which is as follows: A bag-in-bag-out weighing cover includes a cabinet with a weighing space, a box connected to the cabinet, a filter installed in the box, and a fan module located on the side of the box away from the cabinet. The housing has an opening for installing the filter. The opening is fitted with a connecting sleeve that allows a sealing bag to be fitted over it and a cover that can seal the connecting sleeve. The connecting sleeve has at least two sealing positions and forms a receiving space with the cover that can accommodate the sealing bag.

[0007] In one or more embodiments of this utility model, the housing has static pressure chambers at both the upstream and downstream ends of the filter, and each static pressure chamber is connected to a detection head.

[0008] In one or more embodiments of this utility model, the inner sidewall of the housing is formed with an abutment portion, and a sealing strip is installed on the abutment portion on the upstream air inlet surface of the filter, and the filter abuts against the sealing strip.

[0009] In one or more embodiments of the present invention, the filter is mounted with a first track including a first abutting surface and a second abutting surface; The inner wall of the box is provided with a locking mechanism, which includes a connecting plate that can slide relative to the inner wall of the box. The first track slides with the connecting plate, and the connecting plate can move and abut against the first abutting surface or the second abutting surface.

[0010] In one or more embodiments of the present invention, the locking mechanism further includes a handle pivotally connected to the housing and a transmission member pulsatorically connected to the handle, the other end of the transmission member being pivotally connected to the housing.

[0011] In one or more embodiments of this utility model, one side of the connecting plate is bent to form a second track, the first track slides relative to the second track, and the second track movably abuts against the first abutting surface or the second abutting surface; and / or, The locking mechanism also includes an elastic element, the connecting plate is bent to form a folded edge on the side away from the first track, the housing is equipped with an abutment rod, and the elastic element is located between the folded edge and the abutment rod.

[0012] In one or more embodiments of this utility model, a partition is provided inside the cabinet, and an airflow space is formed between the partition and the cabinet. The partition has an air hole that connects the airflow space and the weighing space, and the air outlet of the airflow space is connected to the cabinet.

[0013] The method of using this bag-in-bag-out weighing cover is as follows: Based on the above-mentioned bag-in-bag-out weighing cover... The first sealing bag is fitted onto the connecting sleeve and the first sealing bag is fixed at each sealing position by a sealing ring; Remove the old filter from the box and put it into the first sealed bag; Select two tightening points along the extension direction of the first sealed bag, then select a cutting point between the two tightening points and cut out the old filter. The first sealing bag is pushed back to the outermost sealing position, and the second sealing bag containing the new filter is placed on the connecting sleeve, and the second sealing bag is fixed at the innermost sealing position by a sealing ring. Remove the first sealed bag and install the new filter inside the box.

[0014] In one or more embodiments of this utility model, the method includes: Select two points along the extension direction of the second sealed bag and tighten them. Choose a cutting point between the two tied positions and cut off the remaining part of the first sealed bag; The cover is placed on the connecting sleeve, so that the remaining part of the second sealed bag is contained in the containment space.

[0015] In one or more embodiments of this utility model, the housing has static pressure chambers formed at both the upstream and downstream ends of the filter, and each static pressure chamber is connected to a detection head; the method further includes: Dust is generated in the static pressure chamber at the upstream end, and the detection head is used to detect and obtain the detection data at the upstream and downstream ends respectively. The filtration effect is analyzed by comparing the data at the upstream and downstream ends.

[0016] Compared with existing technologies, this utility model's bag-in, bag-out weighing hood performs weighing operations within the weighing space and maintains a negative pressure environment inside the cabinet through a fan module and filter, reducing the leakage of toxic substances. When replacing the filter, the old filter is first removed from the cabinet through a first sealed bag, and then the new filter is installed through a second sealed bag. During the replacement process, the opening of the cabinet and the old filter remain sealed, thus preventing secondary contamination and reducing the safety risks associated with filter replacement during balance weighing experiments, ensuring comprehensive protection for personnel and the environment. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, 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 recorded in 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 bag-in-bag-out weighing cover in one embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the bag-in-bag-out weighing cover after the hidden outer shell in one embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the box of the bag-in-bag-out weighing cover in one embodiment of the present invention; Figure 4 This is a schematic diagram of the hidden cover at the box of the bag-in-bag-out weighing cover in one embodiment of the present invention; Figure 5 This is a cross-sectional schematic diagram of the box body of the bag-in-bag-out weighing cover in one embodiment of the present invention; Figure 6 for Figure 5 Enlarged view of point A in the middle; Figure 7 This is a schematic diagram of a filter hidden inside the box of a bag-in-bag-out weighing cover in one embodiment of the present invention.

[0019] Explanation of key figure labels: 1. Cabinet; 2. Box; 21. Opening; 22. Abutting part; 3. Filter; 31. First track; 311. First abutting surface; 312. Second abutting surface; 4. Fan module; 5. Partition; 51. Air hole; 6. Connecting sleeve; 7. Cover; 8. Sealing strip; 9. Locking mechanism; 91. Connecting plate; 911. Second track; 912. Folded edge; 92. Handle; 93. Transmission component; 94. Elastic component; 10. Abutting rod; 11. Detection head; 12. Outer shell. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0021] Reference Figures 1 to 3 In one embodiment of this utility model, the bag-in-bag-out weighing hood includes a cabinet 1 with a weighing space, a box 2 connected to the cabinet 1, a filter 3 installed inside the box 2, and a fan module 4 located on the side of the box 2 away from the cabinet 1. During operation, the fan module 4 is activated, and airflow flows from the cabinet 1 through the box 2, and after being filtered by the filter 3, flows to the fan module 4. Therefore, the fan module 4 and the filter 3 work together to maintain a negative pressure environment inside the cabinet 1, reducing the leakage of toxic substances. In this embodiment, the filter 3 can be a high-efficiency particulate filter (HEPA). In this example, the upstream position of the filter 3 is close to the cabinet 1, and the downstream position is close to the fan module 4.

[0022] Reference Figure 1 and Figure 2 In one optional embodiment, the outer casing 12 is also provided on the outside of the housing 2. A touch screen may be provided on the outer casing 12, and a control module may be provided inside the outer casing 12 to control the operation of the fan module 4.

[0023] Reference Figure 2A partition 5 is installed inside the cabinet 1, forming an airflow space between the partition 5 and the cabinet 1. The partition 5 has air holes 51 connecting the airflow space and the weighing space. The air outlet of the airflow space is connected to the box 2. In this embodiment, the partition 5 is located on the side of the cabinet 1, and the airflow space is smaller than the weighing space. The connection point between the box 2 and the airflow space is also located on the side of the box 2, depending on the configuration of the cabinet 1.

[0024] Reference Figure 3 and Figure 4 The housing 2 has an opening 21 for installing the filter 3. The opening 21 is fitted with a connecting sleeve 6 to which a sealing bag can be fitted, and a cover 7 to cover the sealing connecting sleeve 6. The connecting sleeve 6 has at least two sealing positions (not shown in the figure), and forms a receiving space between it and the cover 7 to accommodate the sealing bag. Specifically, the sealing position can be an annular groove on the outer peripheral wall of the connecting sleeve 6, with the annular groove extending along the extension direction of the connecting sleeve 6. In this embodiment, the weighing cover of this application is illustrated by taking the connecting sleeve 6 as an example with two sealing positions. In other embodiments, the number of sealing positions can be specifically set according to actual conditions. For ease of subsequent description, the two sealing positions in this embodiment are an inner groove near the opening 21 and an outer groove away from the opening 21.

[0025] Reference Figure 3 and Figure 4 In this embodiment, the inner diameter of the cover 7 is larger than the outer diameter of the connecting sleeve 6. When the cover 7 is placed on the connecting sleeve 6, the aforementioned receiving space is formed between the inner wall of the cover 7 and the outer wall of the connecting sleeve 6. Since a sealing bag is provided on the outer periphery of the connecting sleeve 6 during subsequent use, the receiving space can accommodate the sealing bag.

[0026] Reference Figure 5 and Figure 6 The inner wall of the housing 2 has an abutment portion 22, and a sealing strip 8 is installed on the abutment portion 22 on the air inlet side upstream of the filter 3. The filter 3 abuts against the sealing strip 8. In this embodiment, since the side of the filter 3 closest to the cabinet 1 is the air inlet side, the position of the sealing strip 8 ensures that harmful substances can only pass through the filter 3 before entering the space on the other side of the housing 2 away from the cabinet 1, and cannot directly enter the space on the other side of the housing 2 away from the cabinet 1. This reduces the spread of pollution sources and prevents harmful substances from harming personnel during future maintenance of the housing 2.

[0027] Reference Figure 5 and Figure 6In one optional embodiment, the filter 3 is equipped with a first track 31 including a first abutment surface 311 and a second abutment surface 312. A locking mechanism 9 is provided on the inner side wall of the housing 2. The locking mechanism 9 can be used to lock the filter 3 to the inside of the housing 2 and make the filter 3 press against the sealing strip 8 to ensure that the pollution source will not contaminate the space on the other side of the housing 2 away from the cabinet 1.

[0028] Reference Figures 5 to 7 The locking mechanism 9 includes a connecting plate 91 that can slide relative to the inner wall of the housing 2. A first track 31 is slidably engaged with the connecting plate 91, and the connecting plate 91 is movably abutting against a first contact surface 311 or a second contact surface 312. The locking mechanism 9 also includes a handle 92 pivotally connected to the housing 2 and a transmission component 93 pultrusively connected to the handle 92. The other end of the transmission component 93 is pivotally connected to the housing 2. The transmission component 93 may consist of a connecting rod and a crank.

[0029] Reference Figures 5 to 7 One side of the connecting plate 91 is bent to form a second track 911. The first track 31 slides relative to the second track 911. The second track 911 is movably abutted against the first abutting surface 311 or the second abutting surface 312. The locking mechanism 9 also includes an elastic element 94. The side of the connecting plate 91 away from the first track 31 is bent to form a folded edge 912. The housing 2 is equipped with an abutting rod 10. The elastic element 94 is located between the folded edge 912 and the abutting rod 10.

[0030] Therefore, the first track 31 of the filter 3 can be connected to the second track 911 of the connecting plate 91, thereby pushing the filter 3 into the housing 2, or removing the filter 3 from the housing 2 along the second track 911. When the locking mechanism 9 is in use, when the handle 92 is pushed upward, the transmission member 93 drives the folded edge 912 of the connecting plate 91 to move, so that the folded edge 912 engages with the abutment rod 10 to compress the spring, and the second track 911 moves upward to abut against the first abutment surface 311 of the first track 31 to move and release the filter 3. When the handle 92 is pushed downward, the transmission member 93 drives the folded edge 912 of the connecting plate 91 to move to release the spring, and the second track 911 presses downward to press against the second abutment surface 312 of the first track 31 to fix the filter 3.

[0031] Reference Figure 1 and Figure 5The housing 2 has static pressure chambers at both the upstream and downstream ends of the filter 3, and each static pressure chamber is connected to a detection head 11. In this embodiment, the detection head 11 is a PAO detection port. According to the airflow direction inside the weighing hood, the upstream position of the filter 3 is close to the housing 1, and the downstream position is close to the fan module 4. By setting the detection heads 11 at the upstream and downstream static pressure chambers, filtration efficiency and leakage tests can be performed. However, existing technologies do not have these two static pressure chambers, so it is impossible to perform integrity tests similar to PAO, and the filtration effect and leakage prevention effect of the installed product cannot be effectively verified.

[0032] Reference Figures 1 to 7 In one embodiment of this utility model, a method for using the bag-in-bag-out weighing cover is also disclosed: The first sealed bag is fitted onto the connecting sleeve 6, and a sealing ring is used to secure the first sealed bag at each sealing position. Combining the bag-in-bag-out weighing hood structure described above, this embodiment provides two sealing positions, including an outer groove and an inner groove. After the first sealed bag is fitted onto the connecting sleeve 6, the sealing ring can be fitted onto both the outer and inner grooves to achieve a double-layer seal on the first sealed bag, reducing the possibility of contaminant leakage.

[0033] The old filter 3 is removed from the housing 2 and placed into the first sealed bag. In this embodiment, the old filter 3 can be unlocked first by the locking mechanism 9, and then the old filter 3 can be taken out from the inside of the housing 2 along the second track 911.

[0034] Two points are selected along the extension direction of the first sealed bag for securing. A cutting point is then chosen between the two securing points to separate and remove the old filter 3. Understandably, after this step, the first sealed bag is divided in two: one part contains the old filter 3 and is secured, while the other part is fixed to the connecting sleeve 6 and secured. Therefore, during this step, the opening 21 of the housing 2 and the old filter 3 remain sealed, thus preventing secondary contamination and resolving the safety risk associated with filter 3 replacement during the balance weighing experiment, ensuring full protection for personnel and the environment.

[0035] The first sealed bag is moved to the outermost sealing position, and the second sealed bag containing the new filter 3 is fitted onto the connecting sleeve 6, with the second sealed bag secured at the innermost sealing position by a sealing ring. Specifically, the first sealed bag can be slid until it is secured only by the sealing ring at the outer groove, while the second sealed bag is fitted over the first sealed bag and secured by the sealing ring at the inner groove.

[0036] Remove the first sealed bag and install the new filter 3 inside the housing 2. Further, after removing the first sealed bag, a second sealed bag can be secured at the outer groove using a sealing ring to achieve a double seal. Since the second sealed bag pre-installed with the new filter 3, it can be quickly and safely installed inside the housing 2. This step is also performed in a sealed environment, and the opening 21 of the housing 2 remains sealed, reducing the possibility of contaminant leakage.

[0037] Two tightening points are selected along the extension direction of the second sealed bag. A cutting point is then chosen between the two tightening points to separate and remove the remaining portion of the first sealed bag. Understandably, after this step, the second sealed bag is also divided in two: one part contains the remaining portion of the first sealed bag and is tightened, while the other part is fixed to the connecting sleeve 6 and tightened as well.

[0038] The cover 7 is placed on the connecting sleeve 6, so that the remaining part of the second sealed bag is contained in the receiving space. Understandably, when the filter 3 is replaced next time, the connecting sleeve 6 will still contain the remaining part of the second sealed bag. The remaining part of the second sealed bag and the old filter 3 can be removed by securing it at both ends and cutting it in the middle using the method described above.

[0039] Furthermore, the method of using the bag-in-bag-out weighing hood in this embodiment also includes testing the filtration effect. Specifically, dust can be generated in the static pressure chamber at the upstream end, and the detection head 11 can be used to detect and acquire the detection data at both the upstream and downstream ends. The filtration effect is then analyzed by comparing the data from the upstream and downstream ends. If the downstream detection data is lower than a set value, it indicates a better filtration effect; conversely, if it is higher, it indicates a poor filtration effect.

[0040] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the present invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0041] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A bag-in-bag-out weighing cover, characterized in that, It includes a cabinet (1) with a weighing space, a box (2) connected to the cabinet (1), a filter (3) installed in the box (2), and a fan module (4) located on the side of the box (2) away from the cabinet (1). The housing (2) has an opening (21) for installing the filter (3). The opening (21) is fitted with a connecting sleeve (6) for covering the sealing bag and a cover (7) for sealing the connecting sleeve (6). The connecting sleeve (6) has at least two sealing positions and forms a receiving space between itself and the cover (7) for receiving the sealing bag. The inner sidewall of the housing (2) has an abutment part (22), and the abutment part (22) is equipped with a sealing strip (8) located on the upstream air inlet surface of the filter (3), and the filter (3) abuts against the sealing strip (8); The filter (3) is equipped with a first track (31) including a first contact surface (311) and a second contact surface (312). The inner wall of the box (2) is provided with a locking mechanism (9). The locking mechanism (9) includes a connecting plate (91) that can slide relative to the inner wall of the box (2). The first track (31) slides with the connecting plate (91), and the connecting plate (91) is movably abutting against the first abutting surface (311) or the second abutting surface (312).

2. The bag-in / bag-out weighing cover according to claim 1, characterized in that, The housing (2) has static pressure chambers at both the upstream and downstream ends of the filter (3), and each static pressure chamber is connected to a detection head (11).

3. The bag-in / bag-out weighing cover according to claim 1, characterized in that, The locking mechanism (9) further includes a handle (92) pivotally connected to the housing (2) and a transmission component (93) pulsatorically connected to the handle (92), the other end of the transmission component (93) being pivotally connected to the housing (2).

4. The bag-in / bag-out weighing cover according to claim 3, characterized in that, One side of the connecting plate (91) is bent to form a second track (911), the first track (31) slides relative to the second track (911), and the second track (911) movably abuts against the first abutment surface (311) or the second abutment surface (312); and / or, The locking mechanism (9) further includes an elastic element (94), the connecting plate (91) is bent on the side away from the first track (31) to form a folded edge (912), the box (2) is equipped with an abutment rod (10), and the elastic element (94) is located between the folded edge (912) and the abutment rod (10).

5. The bag-in / bag-out weighing cover according to claim 1, characterized in that, The cabinet (1) is provided with a partition (5), and the partition (5) and the cabinet (1) enclose an airflow space. The partition (5) has an air hole (51) that connects the airflow space and the weighing space. The air outlet of the airflow space is connected to the box (2).

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