Hazardous chemical substance loading and unloading anti-mixing and anti-theft system
By designing a uniquely matched jack and block mechanism in the hazardous chemical loading and unloading system, combined with the control of the solenoid valve and control unit, the problem of mixing and assembly during the hazardous chemical loading and unloading process is solved, and a safe and reliable loading and unloading process is achieved.
Patent Information
- Application Number
- CN202510020979.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-07
- Publication Date
- 2025-02-28
- Estimated Expiration
- 2045-01-07
AI Technical Summary
During the loading and unloading of hazardous chemicals, it is easy to cause confusion, resulting in mixed installation of hazardous chemicals, causing the risk of waste of resources and safety accidents.
A hazardous chemical loading and unloading anti-mixed anti-theft system was designed. By setting interfaces and connectors at the loading and unloading ports of hazardous chemical transport vehicles and storage areas, the unique matching mechanism of jacks and inserts is used to ensure that only the same type of hazardous chemicals can be loaded and unloaded, and a safe and reliable loading and unloading process is achieved through the cooperation of solenoid valves and control units.
It effectively reduces the probability of hazardous chemicals mixed assembly during loading and unloading, improves the safety and reliability of the loading and unloading process, and avoids waste of resources and potential safety accidents.
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Figure CN119528074A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of hazardous chemicals loading and unloading, and in particular to a hazardous chemicals loading and unloading anti-mixing and anti-theft system. Background Art
[0002] The full name of hazardous chemicals is dangerous chemicals, which refers to highly toxic chemicals and other chemicals that have properties such as poison, corrosion, explosion, combustion, and combustion-supporting, and are harmful to human body, facilities, and the environment. They are also important auxiliary supplies in industrial production.
[0003] After hazardous chemicals are processed in the factory, they need to be transported to the required factory storage area by hazardous goods transport vehicles for storage. During subsequent factory processing, the hazardous chemicals are taken out for production and processing. When a factory that produces hazardous chemicals or a factory that uses hazardous chemicals stores a variety of hazardous chemicals, confusion is likely to occur during the transportation and loading and unloading process, resulting in a situation where the hazardous chemicals are mixed and cannot be used normally, resulting in a waste of resources and even chemical reactions that cause safety accidents. Summary of the invention
[0004] In order to reduce the probability of hazardous chemicals being mixed, the present application provides a hazardous chemicals loading and unloading anti-mixing and anti-theft system.
[0005] The present application provides a hazardous chemicals loading and unloading anti-mixing and anti-theft system that adopts the following technical solutions: A system for preventing mixing and theft of hazardous chemicals during loading and unloading, comprising an interface and a joint, wherein the interface is arranged at the loading and unloading port of a hazardous chemical transport vehicle and the loading and unloading port of a hazardous chemical storage area, the joint is arranged at both sides of a conveying pipeline, the joint and the interface are spliced with each other, the interface is provided with a plurality of plug holes on one side of the interface facing the joint, the plurality of plug holes are evenly arranged around the interface, a plurality of plug blocks are fixedly arranged on the corresponding plug holes on the joint, a push switch is embedded on the side wall of the plug hole, a baffle is slidably arranged in the plug hole, the baffle covers the push switch by sliding so as to be flush with the interface surface or slides below the push switch, the baffle and A control component is arranged between the interfaces, and the control component abuts against the baffle or moves away from the baffle. When the control component abuts against the baffle, the baffle is restricted from sliding toward the bottom wall of the socket. The plug block is slidably arranged on the joint, and a driving component is arranged between the plug block and the joint. The driving component drives the plug block to extend out or be retracted into the joint. A solenoid valve is installed on the interface, and the solenoid valve opens or closes the interface. The solenoid valve is electrically connected to a control unit, and the control unit is electrically connected to a push switch and a control component on the same interface. The driving components on the joints at both ends of the same conveying pipeline are electrically connected to the same driving unit.
[0006] By adopting the above technical scheme, the control unit selects the socket through the driving control component according to the type of hazardous chemicals in the hazardous chemicals transport vehicle or the hazardous chemicals storage area, so that the baffle in the selected socket can slide, and at the same time, the push switch of the socket where the baffle cannot slide is turned on. The driving unit controls the driving component to adjust the plug blocks extending from the joint plate at both ends of the conveying pipeline according to the type of hazardous chemicals to be loaded and unloaded. When the types of hazardous chemicals at both ends of loading and unloading are the same and the types of hazardous chemicals transported by the conveying pipeline are the same, the positions of the socket and the plug block can be docked, and the connector can be connected to the interface. At this time, the plug block is inserted into the socket to turn on the push switch to turn on the circuit. The push switches are all turned on, and the control unit controls the solenoid valve to open. Only then can the hazardous chemicals be loaded and unloaded normally, and the two ends of the loading and unloading of hazardous chemicals are connected through the adapted interface and connector, thereby reducing the probability of mixed loading of hazardous chemicals.
[0007] Optionally, the shapes of the sockets are all different, and the shapes of the plug blocks are all different and correspond one-to-one to the sockets.
[0008] Optionally, a driving ring is rotatably provided in the interface, and a plurality of card blocks are fixedly provided on the driving ring corresponding to the sockets. The driving ring rotates to drive the card blocks to enter or leave the sockets, and a card slot is provided on the plug block corresponding to the card block. When the plug block is inserted into the socket, the driving ring drives the card block to rotate and enter the socket to be engaged in the card slot.
[0009] Optionally, the push switch is arranged on any side wall of the jack except the direction in which the card block enters.
[0010] Optionally, a driving rod is fixedly provided on the driving ring, and the driving rod passes through the interface and extends out of the interface.
[0011] Optionally, an alignment hole is provided on the interface, and an alignment block is fixedly provided on the connector corresponding to the alignment hole. When the alignment block is aligned with the alignment hole, the plug block is aligned with the corresponding plug hole.
[0012] Optionally, the driving rod is arranged at the bottom of the alignment hole after passing through the interface, and a chamfer is provided on the driving rod on a side facing the opening of the alignment hole.
[0013] Optionally, an elastic member is provided in the jack, and the elastic member drives the baffle to be flush with a side of the interface facing the joint.
[0014] In summary, the present application includes at least one of the following beneficial technical effects: 1. The control unit selects the socket through the drive control part according to the type of hazardous chemicals in the hazardous chemicals transport vehicle or hazardous chemicals storage area so that the baffle in the selected socket can slide, and at the same time turns on the push switch of the socket where the baffle cannot slide. The drive unit controls the drive part to adjust the plug blocks extending from the joint plate at both ends of the conveying pipeline according to the type of hazardous chemicals to be loaded and unloaded. When the types of hazardous chemicals at both ends of loading and unloading are the same and the types of hazardous chemicals transported by the conveying pipeline are the same, the positions of the socket and the plug block can be docked, and the joint can be connected to the interface. At this time, the plug block is inserted into the socket to turn on the push switch to turn on the circuit. The push switches are all turned on, and the control unit controls the solenoid valve to open. Only then can the loading and unloading of hazardous chemicals be carried out normally, and the two ends of the loading and unloading of hazardous chemicals are connected through the adapted interface and joint, thereby reducing the probability of mixed loading of hazardous chemicals; 2. The uniqueness of assembly is achieved through different shapes of sockets and plugs, reducing the probability of mixing hazardous chemicals; 3. By rotating the drive ring, the socket can be fixed after the plug is inserted into the socket, reducing the probability of the connector detaching from the interface; 4. Since all the jacks are of different shapes, it is troublesome to align the jacks. The setting of the alignment holes and alignment blocks can facilitate the alignment of the connectors and interfaces, thereby facilitating the plugging of the connectors and interfaces; 5. After the plug-in block is inserted into the socket, the alignment block abuts against the chamfer to make the driving rod rotate on the interface plate, so that the driving ring rotates to drive the card block to rotate from one side of the card slot into the card slot, thereby fixing the plug-in block and facilitating the fixing of the plug-in block in the socket; 6. Since the shapes of the jacks are different, there are many locations for setting the push switch. By setting the positions of the push switches on different interfaces differently, the connector can trigger the push switch only when the interface is compatible, which can reduce the probability of thieves triggering the push switch with a small plug, thus playing an anti-theft role; 7. All baffles are kept flush with the connector tray by springs under normal conditions, making it difficult for thieves to find the actual plug-in interface of the connector, thereby playing an anti-theft role. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.
[0016] Figure 2 It is a partial cross-sectional view of the overall structure of the embodiment of the present application.
[0017] Figure 3 yes Figure 2 Magnified view of part A in the middle.
[0018] Figure 4 It is a system diagram of the control unit and the drive unit of the embodiment of the present application.
[0019] Figure 5 yes Figure 1 Magnified view of part B in the middle.
[0020] In the figure, 1, interface; 101, interface tube; 102, interface plate; 2, connector; 201, connector tube; 202, connector plate; 3, jack; 4, plug block; 5, push switch; 6, baffle; 7, control member; 8, drive member; 9, solenoid valve; 10, interface control panel; 11, connector control panel; 12, drive ring; 13, clamping block; 14, clamping groove; 15, drive rod; 16, alignment hole; 17, alignment block; 18, chamfer; 19, elastic member; 20, return spring. DETAILED DESCRIPTION
[0021] The following is combined with Figure 1-5 The present application is further described with specific embodiments: First of all, it should be noted that in the description of this application, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and other directional words appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of this application; in addition, if the terms "first", "second", "third" and other numerical quantifiers appear, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", and "connected" appear, they should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection, a limited connection such as an interference fit, a transition fit, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium; therefore, for ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.
[0022] The present application embodiment discloses a system for preventing mixing and theft of hazardous chemicals during loading and unloading. Figure 1 , Figure 2 and Figure 3, including an interface 1 and a joint 2, the interface 1 includes an interface pipe 101 and an interface plate 102 integrally formed on the interface pipe 101, the joint 2 includes a joint pipe 201 and a joint plate 202 integrally formed on the joint pipe 201, the loading and unloading port of the hazardous chemical transport vehicle and the loading and unloading port of the hazardous chemical storage area are both connected to the interface pipe 101, the interface pipe 101 is integrally formed and arranged at the loading and unloading port of the hazardous chemical transport vehicle or the loading and unloading port of the hazardous chemical storage area, both ends of the conveying pipeline connecting the transport vehicle and the storage area are connected to the joint pipe 201, the joint pipe 201 is integrally formed and arranged on both sides of the conveying pipeline, the joint 2 and the interface 1 are spliced with each other, so as to realize the docking of the hazardous chemical transport vehicle and the hazardous chemical storage area, and the interface plate 102 is provided with a plurality of The socket 3 and several sockets are evenly arranged around the interface disk 102, and several plug blocks 4 are arranged on the connector disk 202 corresponding to the socket 3. In this embodiment, the number of the socket 3 and the plug block 4 is set to eight. A push switch 5 is embedded on the side wall of the socket 3, and a baffle 6 is slidably arranged in the socket 3. The baffle 6 covers the push switch 5 by sliding and is flush with the surface of the interface disk 102 or slides to below the push switch 5. A control member 7 is arranged between the baffle 6 and the interface disk 102. In this embodiment, the control member 7 is an electric cylinder, which is installed in the interface disk 102. The electric push rod of the electric cylinder abuts against the baffle 6 or moves away from the baffle 6 by sliding. When the electric push rod of the electric cylinder abuts against the baffle 6, the baffle 6 is restricted from sliding toward the bottom wall of the socket 3. The plug block 4 is slidably arranged on the interface disk 102. A driving member 8 is provided between the head plate 202, the plug block 4 and the joint 2. In this embodiment, the driving member 8 is an electric push cylinder, and the telescopic rod of the electric push cylinder is fixedly connected to the plug block 4. The driving member 8 drives the plug block 4 to extend to the joint plate 202 or to be stored in the joint plate 202. A solenoid valve 9 is installed on the interface 1. The solenoid valve 9 is used to open or close the interface 1. The solenoid valve 9 is electrically connected to a control unit. The control unit controls the opening and closing of the solenoid valve 9. The control unit is electrically connected to the push switch 5 and the control member 7 on the same interface 1. The driving members 8 on the joints 2 at both ends of the same conveying pipeline are electrically connected to the same driving unit. The control unit selects the socket 3 to be driven by the driving control member 7 according to the type of hazardous chemicals in the hazardous chemicals transport vehicle or the hazardous chemicals storage area. The baffle 6 in the selected socket 3 can slide, and at the same time, the push switch 5 of the socket 3 that the baffle 6 cannot slide is turned on. The driving unit controls the driving part 8 to adjust the plug blocks 4 extending out of the joint plate 202 at both ends of the conveying pipeline according to the type of hazardous chemicals to be loaded and unloaded. When the types of hazardous chemicals at both ends of the loading and unloading are the same and the types of hazardous chemicals transported by the conveying pipeline are the same, the positions of the socket 3 and the plug block 4 can be docked, and the connector 2 can be connected to the interface 1. At this time, the plug block 4 is inserted into the socket 3 to turn on the push switch 5 to turn on the circuit. The push switches 5 are all turned on, and the control unit controls the solenoid valve 9 to open. Only then can the hazardous chemicals be loaded and unloaded normally, and the two ends of the loading and unloading of hazardous chemicals are connected by the adapted interface 1 and connector 2, thereby reducing the probability of mixed loading of hazardous chemicals.
[0023] Reference Figure 1 , Figure 3 and Figure 4 An interface control panel 10 is installed on the solenoid valve 9 on the interface pipe 101, and the interface control panel 10 is electrically connected to the control unit. By entering different types of hazardous chemicals on the interface control panel 10, the corresponding opening position and quantity of the jack 3 are generated. The content entered on the interface control panel 10 is transmitted to the control unit and stored in the control unit. Subsequently, the corresponding hazardous chemicals are input on the interface control panel 10, and the control unit performs automatic adjustment of the press switch 5 and the control component 7 according to the hazardous chemicals input on the interface control panel 10; a joint control panel 11 is installed on the joint pipe 201, and the joint control panel 11 is electrically connected to the drive unit. By entering different types of hazardous chemicals on the joint control panel 11, the corresponding opening position and quantity of the plug 4 are generated. The content entered on the joint control panel 11 is transmitted to the drive unit and stored in the drive unit. Subsequently, the corresponding hazardous chemicals are input on the joint control panel 11, and the drive unit performs automatic adjustment of the drive component 8 according to the hazardous chemicals input on the joint control panel 11.
[0024] Reference Figure 1 and Figure 2 The shapes of the eight sockets 3 on an interface 1 are all different, and the shapes of the eight plug blocks 4 on a connector 2 are all different and correspond to the sockets 3 one by one. The eight sockets 3 are numbered from one to eight respectively. If the sockets 3 of the same shape are used, when the insertable sockets 3 on the interface 1 are numbered one and five, and the plug blocks 4 of the connector 2 are numbered two and six, docking can be achieved by rotation, which may easily lead to mixed loading of hazardous chemicals. The uniqueness of the assembly is achieved by using sockets 3 and plug blocks 4 of different shapes, thereby reducing the probability of mixed loading of hazardous chemicals.
[0025] Reference Figure 2 and Figure 3 A driving ring 12 is rotatably provided in the interface 1, and a plurality of card blocks 13 are fixedly provided on the driving ring 12 corresponding to the socket 3. The driving ring 12 rotates to drive the card block 13 to enter or detach from the socket 3. A card slot 14 is provided on the plug block 4 corresponding to the card block 13. When the plug block 4 is inserted into the socket 3, the driving ring 12 drives the card block 13 to rotate into the socket 3 and is engaged in the card slot 14. By rotating the driving ring 12, the socket 3 can be fixed after the plug block 4 is inserted into the socket 3, thereby reducing the probability of the connector 2 detaching from the interface 1; a driving rod 15 is fixedly provided on the driving ring 12, and the driving rod 15 passes through the interface 1 and extends out of the interface 1. The setting of the driving rod 15 facilitates driving the driving ring 12 located in the interface disk 102.
[0026] Reference Figure 1 , Figure 2 and Figure 5The interface 1 is provided with an alignment hole 16, and the connector 2 is provided with an alignment block 17 corresponding to the alignment hole 16. When the alignment block 17 is aligned with the alignment hole 16, the plug block 4 is aligned with the corresponding plug hole 3. Since all the plug holes 3 have different shapes, the alignment of the plug holes 3 is more troublesome. The arrangement of the alignment hole 16 and the alignment block 17 can facilitate the alignment of the connector 2 and the interface 1, thereby facilitating the plugging of the connector 2 and the interface 1; the driving rod 15 is arranged at the bottom of the alignment hole 16 after passing through the interface 1, and a chamfer 18 is arranged on the driving rod 15 on the side facing the opening of the alignment hole 16. When the plug block 4 is inserted into the plug hole 3, the alignment block 17 abuts against the chamfer 18 to make the driving rod 1 5 is rotated on the interface disk 102, so that the driving ring 12 rotates and the driving block 13 rotates from one side of the card slot 14 into the card slot 14, so as to fix the plug block 4. In this embodiment, a return spring 20 is arranged between the driving rod 15 and the interface disk 102. The return spring 20 sends the driving rod 15 into the alignment hole 16 through elastic force. In this embodiment, the driving rod 15 has space to continue sliding after sending the card block 13 on the driving ring 12 into the card slot 14. When the connector 2 needs to be disassembled, the card block 13 is detached from the card slot 14 from the other end of the card slot 14 by continuing to slide the driving rod 15. At this time, the plug block 4 can be pulled out from the socket 3.
[0027] Reference Figure 2 and Figure 3 The push switch 5 is arranged on any side wall of the jack 3 except the direction in which the card block 13 enters. Since the shapes of the jacks 3 are different and varied, there are many locations for setting the push switch 5. By setting the positions of the push switches 5 on different interfaces 1 to be different, the connector 2 can trigger the push switch 5 only when the interface 1 is adapted, which can reduce the probability of a thief triggering the push switch 5 with a small-sized plug block 4, thereby playing an anti-theft role.
[0028] Reference Figure 2 and Figure 3 An elastic member 19 is provided in the jack 3, and the elastic member 19 drives the baffle 6 to be flush with the side of the interface 1 facing the connector 2. In this embodiment, the elastic member 19 is a spring, and the spring makes all the baffles 6 flush with the connector plate 202 under normal conditions, so that it is difficult for thieves to find that the plug-in port 1 on the interface 1 can actually be plugged with the connector 2, thereby playing an anti-theft role.
[0029] The implementation principle of the embodiment of the present application is: according to the type of hazardous chemicals transported by the hazardous chemicals transport vehicle, a control unit is used to adjust the socket 3 on the interface 1 at the loading and unloading port of the hazardous chemicals transport vehicle. At the same time, according to the type of hazardous chemicals stored in the hazardous chemicals storage area, a control unit is used to adjust the socket 3 on the interface 1 at the loading and unloading port of the hazardous chemicals storage area, so that the interface 1 of the hazardous chemicals storage area and the hazardous chemicals transport vehicle of the same type is the same. Then, according to the type of hazardous chemicals that need to be loaded and unloaded, the joints 2 at both ends of the conveying pipeline are adjusted to match the corresponding interface 1. When the hazardous chemicals are loaded and unloaded, only by using the matching conveying pipeline to ensure that the loading and unloading ends are compatible can the joint 2 and the interface 1 be connected and assembled. Then, the push switch 5 in the socket 3 is triggered by the plug block 4 to open the solenoid valve 9 for subsequent loading and unloading of hazardous chemicals, thereby reducing the probability of mixed loading of hazardous chemicals.
[0030] It should be noted that the above embodiments are only used to illustrate the present application and are not intended to limit the technical solutions described in the present application. Although the present application has been described in detail in this specification with reference to the above embodiments, a person of ordinary skill in the art should understand that a person of ordinary skill in the art can still modify or make equivalent substitutions to the present application, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present application should be included in the scope of the claims of the present application.
Claims
1. A system for preventing mixing and theft of hazardous chemicals during loading and unloading, characterized by: The invention comprises an interface (1) and a joint (2), wherein the interface (1) is arranged at a loading and unloading port of a hazardous chemical transport vehicle and a loading and unloading port of a hazardous chemical storage area, and the joint (2) is arranged at both sides of a conveying pipeline, the joint (2) and the interface (1) are spliced with each other, the interface (1) is provided with a plurality of plug holes (3) on one side facing the joint (2), the plurality of plug holes are evenly arranged around the interface (1), the joint (2) is fixed with a plurality of plug blocks (4) corresponding to the plug holes (3), a push switch (5) is embedded on the side wall of the plug hole (3), a baffle (6) is slidably arranged in the plug hole (3), the baffle (6) covers the push switch (5) by sliding so as to be flush with the surface of the interface (1) or slides to below the push switch (5), and a control member (7) is arranged between the baffle (6) and the interface (1). ), the control member (7) abuts against the baffle (6) or moves away from the baffle (6), and when the control member (7) abuts against the baffle (6), the baffle (6) is restricted from sliding toward the bottom wall of the plug hole (3); the plug block (4) is slidably arranged on the joint (2), and a driving member (8) is arranged between the plug block (4) and the joint (2), and the driving member (8) drives the plug block (4) to extend or be received in the joint (2); a solenoid valve (9) is installed on the interface (1), and the solenoid valve (9) is used to open or close the interface (1); the solenoid valve (9) is electrically connected to a control unit, and the control unit is electrically connected to the push switch (5) and the control member (7) on the same interface (1); and the driving members (8) on the joints (2) at both ends of the same conveying pipeline are electrically connected to the same driving unit.
2. A hazardous chemicals loading and unloading anti-mixing and anti-theft system according to claim 1, characterized in that: The shapes of the plug holes (3) are all different, and the shapes of the plug blocks (4) are all different and correspond one-to-one with the plug holes (3).
3. A hazardous chemicals loading and unloading anti-mixing and anti-theft system according to claim 2, characterized in that: A drive ring (12) is rotatably arranged in the interface (1), and a plurality of clamping blocks (13) are fixedly arranged on the drive ring (12) corresponding to the insertion hole (3). The drive ring (12) rotates to drive the clamping blocks (13) to enter or leave the insertion hole (3), and a clamping groove (14) is provided on the insertion block (4) corresponding to the clamping block (13). When the insertion block (4) is inserted into the insertion hole (3), the drive ring (12) drives the clamping blocks (13) to rotate and enter the insertion hole (3) to be clamped in the clamping groove (14).
4. A hazardous chemicals loading and unloading anti-mixing and anti-theft system according to claim 3, characterized in that: The push switch (5) is arranged on any side wall of the insertion hole (3) except the direction in which the card block (13) enters.
5. A hazardous chemicals loading and unloading anti-mixing and anti-theft system according to claim 4, characterized in that: A driving rod (15) is fixedly provided on the driving ring (12), and the driving rod (15) passes through the interface (1) and extends out of the interface (1).
6. A hazardous chemicals loading and unloading anti-mixing and anti-theft system according to claim 5, characterized in that: The interface (1) is provided with an alignment hole (16), and an alignment block (17) is fixedly provided on the connector (2) corresponding to the alignment hole (16); when the alignment block (17) is aligned with the alignment hole (16), the plug block (4) is aligned with the corresponding plug hole (3).
7. A hazardous chemicals loading and unloading anti-mixing and anti-theft system according to claim 6, characterized in that: The driving rod (15) is arranged at the bottom of the alignment hole (16) after passing through the interface (1), and a chamfer (18) is provided on the driving rod (15) on a side facing the opening of the alignment hole (16).
8. The system for preventing mixing and theft of hazardous chemicals during loading and unloading according to claim 1 is characterized by: An elastic member (19) is arranged in the insertion hole (3), and the elastic member (19) drives the baffle (6) to be flush with the side of the interface (1) facing the joint (2).
Citation Information
Patent Citations
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Steel pipe
CN211039955U
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CN212269435U
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