A valve holder for a side-opening vehicle-mounted liquid bag

By designing a valve fixing bracket for side-opening vehicle-mounted liquid bags, the liquid pressure is dispersed by utilizing the contact relationship between the bracket and the inner side wall of the vehicle compartment and the valve mounting seat. This solves the problem of easy damage to the side valves of the liquid bags during transportation, thereby improving transportation safety and reducing costs.

CN122482115APending Publication Date: 2026-07-31QINGDAO LAF TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
QINGDAO LAF TECHNOLOGY CO LTD
Filing Date
2026-06-30
Publication Date
2026-07-31

AI Technical Summary

Technical Problem

The existing side valves of the liquid bag are easily damaged by vibration and shaking during transportation, resulting in problems such as valve structure deformation, cracking, and sealing failure.

Method used

A valve mounting bracket for a side-opening vehicle-mounted liquid bag is designed. The first contact part of the bracket abuts against the inner wall of the vehicle compartment, and the second contact part connects to the valve mounting seat to form a receiving cavity to accommodate the valve. The extension part fits against the inner wall of the vehicle compartment. The spatial frame structure is used to disperse the liquid pressure, reduce direct compression, and increase the contact area to improve stability.

Benefits of technology

It effectively prevents valves from colliding with the side walls of the carriage, reduces damage, improves transportation safety and stability, and reduces material usage and manufacturing costs.

✦ Generated by Eureka AI based on patent content.

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Abstract

This application relates to the field of liquid transportation technology, and more particularly to a valve mounting bracket for a side-opening vehicle-mounted liquid bag; it includes a frame body having a first contact portion and a second contact portion arranged at relatively intervals, and a receiving cavity formed inside the frame body; during liquid transportation, the first contact portion is used to abut against the inner side wall of the vehicle compartment, and the second contact portion is used to connect with a valve mounting seat to prevent the vehicle-mounted liquid bag from contacting the inner side wall of the vehicle compartment; the receiving cavity is located between the first contact portion and the second contact portion to accommodate the valve. This application protects the valve and reduces the risk of valve damage during liquid transportation.
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Description

Technical Field

[0001] This application relates to the field of liquid transportation technology, and in particular to a valve holder for a side-opening vehicle-mounted liquid bag. Background Technology

[0002] Liquid bags, as flexible packaging containers used for liquid storage and transportation, are widely used in the transport of liquid media such as chemical liquids, food liquids, and industrial raw materials due to their large loading capacity, low transportation costs, and strong adaptability. In actual transportation scenarios, liquid bags are typically installed inside the cargo compartment of high-sided trucks, where the compartment structure limits and supports the liquid bags to reduce the impact of liquid bag swaying on transportation stability.

[0003] In existing technologies, liquid bags typically have loading and unloading valves at the top, through which the liquid medium is filled and unloaded. During loading and unloading operations, workers need to climb to the top of the high-sided truck to operate the valves. Especially for high-sided trucks with tall cargo compartments, workers need to use climbing equipment or stand on the truck's structure to operate, which is not only cumbersome but also affects overall work efficiency in frequent loading and unloading scenarios. Furthermore, in rainy, snowy, or nighttime working environments, climbing at heights can easily lead to missteps and slips, increasing the difficulty of on-site operations.

[0004] To address the aforementioned issues, some existing liquid bags are beginning to incorporate loading and unloading valves on their sides, aligning the valves with the side-opening doors of high-sided trucks. This allows the valves to be exposed through the side doors, facilitating the loading and unloading of liquid media. This method eliminates the need for workers to climb to heights to connect valves and perform loading and unloading operations, reducing loading and unloading time and improving operational convenience.

[0005] However, during actual transportation, the valve area located on the side is continuously squeezed against the side wall of the carriage or the railing structure. When the vehicle vibrates or the liquid bag shakes during operation, the valve is easily squeezed, collided, or rubbed against the side wall of the carriage, which can lead to problems such as deformation, cracking, loosening of connections, or failure of the seal. Summary of the Invention

[0006] To address the issue of valves being easily damaged during transportation, this application provides a valve mounting bracket for side-opening vehicle-mounted liquid bags.

[0007] In a first aspect, this application provides a valve mounting bracket for a side-opening vehicle-mounted liquid bag, employing the following technical solution: A valve mounting bracket for a side-opening vehicle-mounted liquid bag includes a frame body, the frame body having a first contact portion and a second contact portion arranged at relatively intervals, and a receiving cavity is formed inside the frame body; During liquid transportation, the first contact part is used to abut against the inner wall of the compartment, and the second contact part is connected to the valve mounting seat to prevent the on-board liquid bag from contacting the inner wall of the compartment; The receiving cavity is located between the first contact portion and the second contact portion to accommodate the valve; An extension portion extending away from the frame is fixedly connected to the frame, and the extension portion can fit against the inner side wall and / or inner bottom wall of the carriage.

[0008] The valve is supported and limited by two contact points that abut against the inner wall of the carriage and the valve mounting seat, respectively. When the liquid inside the liquid bag exerts lateral pressure on the valve area due to shaking, inertial impact, or vehicle vibration during transportation, this pressure can be transmitted to the frame through the second contact point, and then to the inner wall of the carriage through the first contact point. The carriage structure bears the load, preventing the pressure inside the liquid bag from directly acting on the vulnerable end of the valve.

[0009] The frame has an internal cavity, which is mainly used to reserve independent clearance space for the valve, allowing the valve to be located inside the frame rather than being directly exposed near the side wall of the carriage. The technical advantage is that the frame not only provides limiting support for the valve but also creates a protective enclosure around it, reducing the impact of external structures on the valve during bumpy transport and improving the transport safety of the valve area.

[0010] The extension forms surface contact with the inner side wall and / or bottom wall of the carriage, thereby increasing the contact area between the frame and the carriage. At the same time, the liquid bag above the extension compresses and fixes the frame. The combination of these two factors improves the stability of the valve fixing frame inside the carriage and reduces frame swaying or displacement caused by vehicle vibration during transportation.

[0011] Optionally, the frame is a spatial frame structure assembled from multiple rod-shaped components, and the receiving cavity is the internal hollow area of ​​the spatial frame structure.

[0012] The frame is designed as a spatial frame structure composed of multiple rod-like components. This design leverages the interconnections between these components to create a stable three-dimensional force-bearing system. This allows pressure from the valve area to be transmitted and dispersed in multiple directions during transport, preventing excessive stress concentration in localized areas. Compared to solid plate structures, the rod-like frame structure, while meeting overall strength and stiffness requirements, reduces material usage and overall weight, thereby minimizing the additional impact of the valve mounting bracket on transport loads. The technical advantages are that it achieves structural lightweighting while ensuring valve support stability, improving the device's transport adaptability, and reducing manufacturing costs.

[0013] Optionally, the frame includes two sets of spaced-apart side support frames and a plurality of fixing rods connected between the two sets of side support frames, wherein the first contact portion and the second contact portion are respectively formed on opposite sides of the side support frames.

[0014] Two sets of spaced-apart side support frames are installed and connected by multiple fixing rods. The two sets of side support frames form a first contact area and a second contact area, respectively, thus establishing a support structure that allows the force from the valve area to be transmitted between the two support frames. The fixing rods are used to maintain the relative distance between the two sets of side support frames to prevent structural deformation under transportation vibration conditions.

[0015] Meanwhile, the fixing rod connects the two sets of side support frames. This is because the fixing rod serves both as a connecting component and as a primary force transmission component. The lateral pressure generated by the liquid inside the liquid bag can be transmitted step-by-step to the side wall of the carriage through the second support frame, the fixing rod, and the first support frame. The technical advantage is that it improves the overall load transfer efficiency and reduces the risk of structural fatigue or weld cracking caused by concentrated stress in localized areas.

[0016] Optionally, the side support frame includes multiple abutment rods, which are arranged to form the side support frame.

[0017] Multiple support rods are arranged to form a ring structure, naturally creating an opening through which the valve can pass. Simultaneously, multiple grounding rods are welded together, simplifying the process and making it easy to manufacture.

[0018] Optionally, the extension may be a frame structure assembled from rod-shaped components; or a plate-shaped structure.

[0019] Plate-like structures can create a large continuous contact area, making them suitable for applications with relatively flat interior walls; frame structures, on the other hand, can reduce overall weight while maintaining support performance. The technical advantage lies in improving the adaptability of the valve mounting bracket to different transportation environments.

[0020] Optionally, it also includes a connector that is fixedly connected to the valve mounting base, and a fixing component is provided on the frame to fix the connector.

[0021] An intermediate transition structure is formed between the valve and the frame by connecting parts, so that the valve can be reliably fixed on the frame.

[0022] Optionally, the connector is a mesh structure.

[0023] The mesh structure has multiple mesh openings, which reduces the weight of the connectors and makes them easier to assemble and disassemble.

[0024] Optionally, the fastener is a flexible strip structure, which passes through the mesh on the connector and is tied to the frame.

[0025] The mesh structure has multiple openings, facilitating the fasteners to pass through and be secured at different locations, thus adapting to valve structures of different sizes and installation positions. Simultaneously, the flexible strip structure provides a degree of elastic cushioning while ensuring connection stability. Under conditions of transport vibration or liquid bag sloshing, it can absorb some of the impact energy.

[0026] Optionally, the fastener is a cable tie.

[0027] Cable ties are characterized by low cost, convenient installation, and high binding efficiency. Operators can quickly complete the fixed connection between the valve and the frame, reducing on-site installation time.

[0028] Optionally, the side support frame that fits against the inner side wall of the carriage is used as the first support member, and the other side support frame is used as the second support member; the first support member is provided with an extension, and a transition member is provided between the extension and the second support member, with both ends of the transition member connected to the second support member and the extension respectively.

[0029] This application has the following technical effects: By limiting the valve with a frame, the collision between the valve and the side wall of the carriage can be reduced, thus solving the problem of valves being easily damaged by collisions during transportation. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of a valve fixing bracket for a side-opening vehicle liquid bag according to an embodiment of this application.

[0031] Figure 2 This is a structural diagram of a valve holder for a side-opening vehicle-mounted liquid bag, according to an embodiment of this application, in which multiple extensions are configured.

[0032] Figure 3 This is a schematic diagram of a side support frame with different structures in a valve fixing bracket for a side-opening vehicle liquid bag according to an embodiment of this application.

[0033] Figure 4 This is a schematic diagram of the overall structure of Embodiment 2 of a valve fixing bracket for a side-opening vehicle liquid bag according to an embodiment of this application.

[0034] Reference numerals: 1. Frame; 11. First contact part; 12. Second contact part; 13. Receiving cavity; 14. Side support frame; 141. First support member; 142. Second support member; 143. Abutment rod; 15. Fixing rod; 16. First support surface; 17. Second support surface; 2. Extension part; 21. Extension rod; 22. Reinforcing rod; 3. Connector; 4. Fixing member; 5. Transition member. Detailed Implementation

[0035] Example 1 Reference Figure 1 A valve mounting bracket for a side-opening vehicle-mounted liquid bag includes a frame 1 with a first contact portion 11 and a second contact portion 12 spaced apart from each other. A receiving cavity 13 is formed inside the frame 1. During liquid transportation, the first contact portion 11 abuts against the inner wall of the high-sided vehicle compartment, and the second contact portion 12 abuts against the valve mounting seat. This forms a rigid support between the inner wall of the compartment and the valve, restricting the displacement of the liquid bag towards the inner wall of the compartment and preventing liquid pressure from squeezing the valve against the inner wall, thus reducing the possibility of damage to vulnerable parts of the valve due to compression. The receiving cavity 13 is located between the first contact portion 11 and the second contact portion 12, and the valve body is housed within the receiving cavity 13. The frame 1 provides limiting support for the valve while also offering surrounding protection to prevent lateral impact damage during transport.

[0036] Reference Figure 1 The frame 1 is a spatial frame structure assembled from multiple rod-shaped components, and the receiving cavity 13 is formed by the hollow area inside the spatial frame structure. Compared with solid plate structures, the spatial frame structure assembled from rod-shaped components reduces the overall weight, material usage, and cost while ensuring structural strength and rigidity. Furthermore, the hollow receiving cavity 13 facilitates observation of the valve status during transportation and is also beneficial for valve operators to perform connection operations.

[0037] Reference Figure 1 The cross-sections of each rod-shaped component can be rectangular, circular, or I-shaped, etc. The preferred materials are Q235 steel or 304 stainless steel. Q235 steel is suitable for ordinary road transport conditions, offering high strength and economy; 304 stainless steel is suitable for transporting corrosive liquids, possessing excellent corrosion resistance. The rod-shaped components are fixedly connected by argon arc welding, with a weld leg height of not less than 3 mm to ensure the connection strength at the joints meets the requirements of transport vibration loads.

[0038] Reference Figure 1 In other embodiments, the rod-shaped components can also be fixed by bolting or riveting. When bolting, M8 socket head cap screws are preferred, with spring washers to prevent loosening and facilitate disassembly and maintenance. When riveting, rivets with a diameter of not less than 5 mm are used, which is suitable for occasions with more stringent weight requirements.

[0039] Reference Figure 1Specifically, the frame 1 includes two sets of spaced-apart side support frames 14 and a plurality of fixing rods 15 connecting the two sets of side support frames 14. The two sets of side support frames 14 are arranged in parallel and spaced apart, with their opposite sides forming a first contact portion 11 and a second contact portion 12, respectively. The side support frame 14 that abuts against the inner side wall of the carriage is defined as the first support member 141, and the side support frame 14 that abuts against the valve mounting seat on the other side is defined as the second support member 142. The fixing rods 15 are disposed between the first support member 141 and the second support member 142, and both ends of the fixing rods 15 are welded and fixed to the first support member 141 and the second support member 142, respectively. At least one fixing rod 15 is provided to connect the two side support frames 14.

[0040] Reference Figure 1 and Figure 2 The side support frame 14 includes at least two abutment rods 143, which are located in the same plane, thereby forming a first contact portion 11 and a second contact portion 12. In this embodiment, four abutment rods 143 are provided, and the four abutment rods 143 are arranged to form a "U"-shaped frame structure.

[0041] Reference Figure 1 and Figure 2 Of course, in some embodiments, the side support frame 14 may also include only three abutment rods 143, which are welded together, and then the abutment rods 143 of the two side support frames 14 are fixed by fixing rods 15 to form the frame 1. The number of abutment rods 143 can be adjusted in the specific implementation process, as long as multiple abutment rods 143 are located in the same plane.

[0042] Reference Figure 1 The length of the fixing rod 15 determines the distance between the first contact portion 11 and the second contact portion 12. This distance should be greater than the axial dimension of the valve to ensure that the valve can be completely accommodated within the receiving cavity 13 without being squeezed. In other embodiments, the number of fixing rods 15 may be two, three, six or more, which can be adjusted according to the weight of the valve and the transportation conditions. The more rods there are, the higher the overall rigidity of the frame 1, making it suitable for more severe transportation conditions.

[0043] Reference Figure 1 An extension 2 extending away from the frame 1 is fixedly connected to the frame 1. The extension 2 can fit against the inner side wall and / or the inner bottom wall of the carriage. The extension 2 increases the contact area between the frame 1 and the carriage, improving the stability of the overall device inside the carriage.

[0044] Reference Figure 1It is understood that during use, the frame 1 is placed inside the carriage, and it contacts at least two inner walls of the carriage, namely the bottom wall and at least one side wall. For ease of description, the side of the frame 1 that is in contact with the inner side wall of the carriage is designated as the first support surface 16, and the side that is in contact with the bottom wall is designated as the second support surface 17. In this embodiment, the frame 1 is in contact with one side wall of the carriage, therefore the first support surface 16 is the first contact portion 11.

[0045] Reference Figure 1 and Figure 3 It is understandable that as long as the extension 2 is provided on the first support surface 16 and the second support surface 17, the contact area between the valve fixing frame and the carriage can be increased, thereby improving the stability of the frame 1. Therefore, the number of extensions 2 is not limited to one or one direction. The extension 2 can extend in multiple directions on the first support surface 16 and / or the second support surface 17.

[0046] Reference Figure 1 In this embodiment, two extensions 2 are provided, one on the first support member 141 and the other on the second support member 142. The extension 2 on the first support member 141 is flush with the first support surface 16. The extension 2 on the second support member 142 is flush with the second support surface 17.

[0047] Reference Figure 1 The extension 2 on the second support member 142 includes two extension rods 21, which are arranged in parallel and spaced apart, and one end is integrally formed or welded to the second support member 142. The length of the extension rods 21 is set between 30cm and 100cm. In order to improve the stability of the two extension rods 21, a reinforcing rod 22 is provided between the two extension rods 21. The two ends of the reinforcing rod 22 are welded to the two extension rods 21 respectively, thereby forming an "H"-shaped structure or a "door"-shaped structure.

[0048] Reference Figure 1 The extension 2 on the first support member 141 and the extension 2 on the second support member 142 have the same structure, which will not be described in detail here.

[0049] It is understood that in other embodiments, the extension 2 may also be a plate-like structure to ensure support stability. The plate-like extension 2 is suitable for applications where the bottom or side walls of the carriage are relatively flat, offering advantages such as ease of manufacture and low cost. The extension 2 may also be a grid-like structure, welded together from multiple intersecting rod-like components. The grid-like structure balances lightweight design with a larger equivalent contact area, resulting in better overall performance.

[0050] Reference Figure 1To achieve a reliable connection between the valve mounting bracket and the valve, a connector 3 is provided on the valve. The connector 3 is fixedly connected to the mounting seat of the valve, which is sleeved on the outside of the valve. The fixed connection can be achieved by bonding, screw connection, etc.; or it can be sleeved on the outside of the valve and fixedly bonded to the outer wall of the valve.

[0051] Reference Figure 1 The frame 1 is equipped with a fixing member 4, which is used to fix the connecting member 3, thereby realizing the connection between the valve and the frame 1 and ensuring that the second contact part 12 always maintains reliable contact with the valve mounting seat. The connecting member 3 has a mesh structure with evenly distributed mesh holes. The mesh hole diameter ranges from 5 mm to 15 mm. The overall outline of the mesh structure matches the shape of the valve, which facilitates the fixing member 4 to pass through the mesh holes and be tied and fixed to the frame 1.

[0052] Reference Figure 1 The fastener 4 is a flexible strip structure. It passes through the mesh of the connector 3 and is tied to the rod-shaped component of the frame 1. The tension of the flexible strip structure tightly fixes the connector 3 to the frame 1. The flexible strip structure provides elastic cushioning under vibration conditions during transport, preventing stress concentration damage caused by vibration and impact in rigid connections. In a preferred embodiment, the fastener 4 is a cable tie. After passing through the mesh of the connector 3, the cable tie is wrapped around the fixing rod 15 of the frame 1 or the rod-shaped component of the side support frame 14 and tightened. This is convenient to operate, and the cable tie is a disposable consumable, extremely low in cost, and easy to replace.

[0053] In other embodiments, the fixing element 4 may also be a steel wire rope, which is fixed to the frame 1 at both ends by wire clamps after passing through the mesh.

[0054] In this embodiment, the main function of the connector 3 is to connect the valve and the frame 1. In other embodiments, the connector 3 is not limited to a plate-shaped structure. As long as it can play a transition role between the valve and the frame 1, it is acceptable. For example, the connector 3 can also be a rod-shaped structure. One end of the connector 3 is fixedly connected to the valve, and the other end is fixed to the frame 1 by the fastener 4.

[0055] This application also discloses the implementation principle of a valve fixing bracket for a side-opening vehicle-mounted liquid bag: The bracket 1 is placed inside the cargo compartment of a high-sided vehicle, with the first contact portion 11 of the bracket 1 facing the inner side wall of the cargo compartment. After the liquid bag is placed into the cargo compartment, the valve on the side of the liquid bag is aligned with the receiving cavity 13 of the bracket 1, and the valve mounting seat abuts against the second contact portion 12. At this time, the connecting piece 3 is located on one side of the second contact portion 12. The operator passes the fixing piece 4 through the mesh of the connecting piece 3 and then binds it around the rod-shaped component of the bracket 1 to complete the connection between the valve and the bracket 1.

[0056] During transportation, the liquid inside the bag exerts continuous lateral pressure on the valve. This pressure is transmitted through the valve mounting seat to the second contact part 12, and then through the spatial frame structure of the frame 1 to the first contact part 11, ultimately being borne by the inner wall of the carriage. The frame 1 forms a rigid support between the valve and the inner wall of the carriage, reliably limiting the valve's position and preventing displacement towards the inner wall of the carriage due to liquid pressure. This effectively prevents damage caused by direct pressure contact between the valve and the inner wall of the carriage.

[0057] Example 2 Reference Figure 4 The difference between this embodiment and embodiment 1 is that the structure of the extension 2 on the first support member 141 is different. In this embodiment, the extension 2 on the first support member 141 includes two extension rods 21. The length of the extension rods 21 is between 20cm and 50cm. Since the length is relatively short, no reinforcing rod 22 is provided between the two extension rods 21 on the first support member 141.

[0058] Meanwhile, for ease of description, the extension 2 on the first support member 141 is designated as the first adhesive portion. A transition member 5 is provided between the first adhesive portion and the second support member 142. The two ends of the transition member 5 are connected to the second support member 142 and the extension 2, respectively, thereby connecting the extension 2, the transition member 5, and the frame 1 as a whole, enhancing the connection rigidity between the extension 2 and the frame 1. Under the action of the transition member 5, the extension 2 is reinforced on the one hand, and the connection and fixation between the two side support frames 14 are also achieved on the other hand. Therefore, in this embodiment, the upper part of the two side support frames 14 is not provided with a fixing rod 15, thus saving materials. In addition, the inclined transition member 5 avoids sharp corner areas, which can reduce the possibility of scratches and damage to the liquid bag.

[0059] It is understandable that in the specific production process, the connection between the rod-shaped components is not limited to welding, but can also be integrally formed (i.e., various rod-shaped components are formed by bending).

[0060] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A valve mounting bracket for a side-opening vehicle-mounted liquid bag, characterized in that, Includes a frame (1), which has a first contact portion (11) and a second contact portion (12) arranged at relative intervals, and a receiving cavity (13) is formed inside the frame (1). During liquid transportation, the first contact part (11) is used to abut against the inner wall of the compartment, and the second contact part (12) is connected to the valve mounting seat to prevent the on-board liquid bag from contacting the inner wall of the compartment; The receiving cavity (13) is located between the first contact portion (11) and the second contact portion (12) to receive the valve; An extension (2) is fixedly connected to the frame (1) and extends away from the frame (1). The extension (2) can fit against the inner side wall and / or the inner bottom wall of the carriage.

2. A valve mounting bracket for a side-opening vehicle-mounted liquid bag according to claim 1, characterized in that, The frame (1) is a spatial frame structure spliced ​​together from multiple rod-shaped components, and the receiving cavity (13) is the internal hollow area of ​​the spatial frame structure.

3. A valve mounting bracket for a side-opening vehicle-mounted liquid bag according to claim 2, characterized in that, The frame (1) includes two sets of spaced side support frames (14) and a plurality of fixing rods (15) connected between the two sets of side support frames (14). The first contact portion (11) and the second contact portion (12) are formed on the opposite sides of the side support frames (14).

4. A valve mounting bracket for a side-opening vehicle-mounted liquid bag according to claim 3, characterized in that, The side support frame (14) includes a plurality of abutment rods (143), which are arranged to form the side support frame (14).

5. A valve mounting bracket for a side-opening vehicle-mounted liquid bag according to claim 1, characterized in that, The extension (2) is a frame structure made of rod-shaped components; or a plate-shaped structure.

6. A valve mounting bracket for a side-opening vehicle-mounted liquid bag according to claim 1, characterized in that, It also includes a connector (3) that is fixedly connected to the valve mounting base, and a fastener (4) is provided on the frame (1) for fixing the connector (3).

7. A valve mounting bracket for a side-opening vehicle-mounted liquid bag according to claim 6, characterized in that, The connector (3) has a mesh structure.

8. A valve mounting bracket for a side-opening vehicle-mounted liquid bag according to claim 7, characterized in that, The fastener (4) is a flexible strip structure, and the fastener (4) passes through the mesh on the connector (3) and is tied to the frame (1).

9. A valve mounting bracket for a side-opening vehicle-mounted liquid bag according to claim 8, characterized in that, The fastener (4) is a cable tie.

10. A valve mounting bracket for a side-opening vehicle-mounted liquid bag according to claim 3, characterized in that, The side support frame (14) that fits against the inner side wall of the carriage is used as the first support member (141), and the other side support frame (14) is used as the second support member (142). An extension (2) is provided on the first support member (141), and a transition member (5) is provided between the extension member (2) and the second support member (142). The two ends of the transition member (5) are connected to the second support member (142) and the extension member (2) respectively.