Liquid dangerous chemical tank car loading and unloading platform

Abstract

The invention discloses a liquid dangerous chemical tank car loading and unloading platform which comprises a tank car pipe mounted on a tank car and a loading and unloading pipe and further comprises a valve pipe fixedly connected with the tank car pipe; the mounting cover is fixedly arranged on the tank car pipe, and a limiting piece is fixedly mounted on the tank car pipe; and the control valve structure is mounted between the tank car pipe and the mounting cover and is used for controlling the discharge of liquid in the tank car. The device has the advantages that by adopting the structural design of quick plugging, rotary buckling and the like, an operator can quickly finish accurate butt joint of the tank car pipe and the loading and unloading pipe in a short time, compared with a traditional flange connection mode, the single-time loading and unloading time is obviously shortened, two-stage leakage protection treatment is adopted in the installation process, and the installation efficiency is improved. The fitting degree of the sealing connection position is automatically adjusted through the liquid discharge pressure, it is ensured that the sealing structure can still be kept free of leakage when the pressure fluctuates, and automatic operation of opening the valve when the valve is connected and closing the valve when the valve is separated is achieved through the linkage design of the sealing structure and the valve control structure.

Description

Technical Field

[0001] The present invention relates to the technical field of tank truck loading and unloading, and particularly to a loading and unloading platform for liquid hazardous chemical tank trucks. Background Art

[0002] A loading and unloading platform for liquid hazardous chemical tank trucks is a facility used for the loading and unloading operations of liquid hazardous chemical tank trucks. Its main function is to provide a safe and efficient loading and unloading operation site for tank trucks (usually transport vehicles carrying liquid hazardous chemicals). These platforms are usually installed in chemical plants, storage areas or docks, etc., for handling the incoming and outgoing goods of liquid chemicals.

[0003] In order to transfer liquid chemicals, the platform is often equipped with an oil delivery arm, a loading and unloading pump, etc. to transport the liquid from the tank truck to the storage tank or from the storage tank to the tank truck. When connecting the pipeline between the oil delivery arm and the tank truck, traditional flange connection is often used. Flange connection requires the use of multiple bolts and nuts for fixation. During the liquid loading and unloading process, each time of connection and disconnection requires tightening or loosening these bolts and nuts one by one, which not only consumes a large amount of time and manpower, but also in some emergency situations, rapid connection or separation cannot be achieved, affecting the liquid unloading efficiency and emergency handling ability; flange connection is relatively rigid and requires high installation accuracy for pipelines. In actual operation, if there is a certain positional deviation between the tank truck and the loading and unloading platform or the pipeline has slight deformation, it may cause the flange connection to not proceed smoothly, or generate additional stress in the pipeline after connection, affecting the stability and safety of the pipeline system; at the same time, although flange connection is equipped with a sealing gasket, in actual use, only two butt - joint sealing gaskets are used for connection. When the pressure is unstable during the pipeline liquid unloading process and causes shaking, relative displacement will occur between the two sealing gaskets, resulting in an increased risk of leakage. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems of troublesome liquid loading and unloading and liquid leakage in the prior art, and to propose a loading and unloading platform for liquid hazardous chemical tank trucks.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions: A loading and unloading platform for liquid hazardous chemical tank trucks, including a tank truck pipe and a loading and unloading pipe installed on the tank truck, and further including: A valve pipe, which is fixedly connected to the tank truck pipe; A mounting cover, which is fixedly arranged on the tank truck pipe, and a limiting member is fixedly installed on the tank truck pipe; A control valve structure, which is installed between the tank truck pipe and the mounting cover and is used to control the discharge of the liquid in the tank truck; The sealed connection structure is arranged between the tank car pipe and the loading and unloading pipe, and adopts the method of quick plug-in and rotary buckle to quickly connect and separate the tank car pipe and the loading and unloading pipe. When the connection is completed, the main seal and the dynamic compensation two-stage sealing system jointly seal the connection of the circulating liquid, and cooperate with the control valve structure to realize the connection valve opening and separation valve closing.

[0006] In the above-mentioned liquid hazardous chemical tank truck loading and unloading platform, a sealing plate is fixedly installed on the loading and unloading pipe, a limiting block is fixedly installed on the sealing plate, and a slot is provided on the limiting block.

[0007] In the above-mentioned liquid hazardous chemical tank truck loading and unloading platform, a slide groove is provided on the limiting member, and the slide groove is L-shaped as a whole, which is used for the sliding of the limiting block.

[0008] In the above-mentioned liquid hazardous chemical tank truck loading and unloading platform, the control valve structure includes a sliding hole opened on the tank truck pipe, a push rod is slidably arranged in the sliding hole, the push rod is slidably arranged in the sliding groove and the sliding hole for use with the slot, a gear rod 1 and a gear rod 2 in opposite directions are arranged on the front side of the push rod, the gear rod 1 and the gear rod 2 are horizontally staggered, and two springs are installed between the mounting cover and the push rod.

[0009] In the above-mentioned liquid hazardous chemical tank truck loading and unloading platform, a valve column is sealably rotatably installed on the valve tube, a gear 1 is fixedly installed on one end of the valve column located outside the valve tube, and gear 1 is alternately meshed with gear rod 1 and gear rod 2 for use, a ball valve is fixedly installed on one end of the valve column located inside the valve tube, and the ball valve sealably rotates inside the valve tube.

[0010] In the above-mentioned liquid hazardous chemical tank truck loading and unloading platform, the sealing connection structure includes a plurality of extrusion grooves opened on the inner side of the tank truck pipe, and a clamping block is slidably installed in each of the plurality of extrusion grooves. Fixed blocks are fixedly arranged on both sides of the plurality of clamping blocks. When the two fixed blocks are arranged, the clamping block will not be separated from the tank truck pipe, and a main sealing component is installed in the tank truck pipe.

[0011] In the above-mentioned liquid hazardous chemical tank truck loading and unloading platform, the main sealing component includes a telescopic groove and a plurality of displacement grooves opened in the tank truck pipe, and the plurality of displacement grooves are connected to the telescopic groove, and a stop block is slidably installed in each displacement groove, and the width and thickness of the stop block are both smaller than the blocking block, and a gear 2 is rotatably installed in each displacement groove, and a tooth plate 1 is fixedly installed at one end of each stop block away from each other, and a push plate is slidably installed in each displacement groove, and a tooth plate 2 is fixedly installed at one end of each push plate away from each other, and each gear 2 is meshed with the corresponding tooth plate 1 and tooth plate 2, and a sealing half ring is fixedly installed at one end of each push plate close to each other, and the sealing half ring slides in the telescopic groove, and a plurality of sealing half rings are sealed and connected to each other to form a circle.

[0012] In the above-mentioned loading and unloading platform for liquid hazardous chemical tank trucks, the loading and unloading pipe is provided with inclined grooves, a plurality of unlocking grooves, a plurality of clamping grooves and a plurality of rotating grooves. Each unlocking groove communicates with the corresponding clamping groove and the corresponding rotating groove. The clamping block can be clamped in the clamping groove, and the abutting block can be clamped in the rotating groove for use. Horizontally pushing the loading and unloading pipe towards the tank truck pipe can achieve the clamping of the clamping block and the clamping groove, realizing the installation of the loading and unloading pipe and the tank truck pipe. Further pushing the loading and unloading pipe forward can make the clamping block slide at the inclined groove position. At this time, the abutting block reaches the position of the rotating groove. Then, rotate the loading and unloading pipe and pull it in the direction away from the tank truck pipe. At this time, both the abutting block and the clamping block slide in the unlocking groove, realizing the separation of the loading and unloading pipe and the tank truck pipe. The lower ends of the plurality of clamping blocks and the plurality of abutting blocks are all wedge-shaped, and the grooves used in cooperation with them are also of the same shape.

[0013] In the above-mentioned loading and unloading platform for liquid hazardous chemical tank trucks, a sealing ring is fixedly installed on the loading and unloading pipe, and the sealing ring is located at the inclined groove. The sealing ring and a plurality of sealing half-rings cooperate for main sealing, and a compensation sealing component is installed on the loading and unloading pipe.

[0014] In the above-mentioned loading and unloading platform for liquid hazardous chemical tank trucks, the compensation sealing component includes a plurality of accommodating grooves and a plurality of circular grooves opened on the loading and unloading pipe. The plurality of circular grooves communicate with the corresponding rotating grooves and the corresponding accommodating grooves. A guide rod is slidably installed in each of the plurality of circular grooves, and a limit ring is fixedly installed on each of the plurality of guide rods. A buffer liquid is filled in each of the plurality of accommodating grooves and circular grooves, and the inner side of the sealing ring is at the outlet position of the accommodating groove. When the clamping block enters the clamping groove position, it will squeeze the guide rod. At this time, the guide rod squeezes the liquid in the accommodating groove to expand towards the sealing ring.

[0015] Compared with the existing technology, the present invention adopts structural designs such as quick plugging and unplugging, rotary buckles, etc., enabling operators to quickly complete the precise docking of the tank truck pipe and the loading and unloading pipe in a short time. Compared with the traditional flange connection method, the single loading and unloading time is significantly shortened. During the installation process, a two-stage leakage protection treatment is adopted, and the liquid discharge pressure is used to automatically adjust the fitting degree of the sealing connection, ensuring that the sealing structure can still maintain no leakage under pressure fluctuations. The linkage design with the control valve structure realizes the automatic operation of opening the valve when connected and closing the valve when separated. When the sealing connection structure completes the docking of the tank truck pipe and the loading and unloading pipe, the valve pipe is synchronously opened without manual secondary operation of the valve; during disassembly, the valve pipe automatically closes before the connection pipeline is separated, preventing accidental leakage and effectively avoiding safety accidents caused by misoperation of operators. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of a loading and unloading platform for a liquid hazardous chemical tank truck proposed by the present invention; Figure 2 is a schematic structural diagram from another perspective of the present invention; Figure 3 Schematic diagram of the internal structure of the installation cover in the present invention; Figure 4 In the present invention Figure 3 Enlarged schematic diagram of the structure of part a; Figure 5 In the present invention Figure 3 Top view; Figure 6 In the present invention Figure 5 Cross-sectional view of the tank truck pipe along the A-A direction; Figure 7 In the present invention Figure 5 Cross-sectional view of the tank truck pipe along the B-B direction; Figure 8 Schematic diagram of the structure of the loading and unloading pipe in the present invention; Figure 9 In the present invention Figure 8 Top view; Figure 10 In the present invention Figure 9 Cross-sectional view of the loading and unloading pipe along the C-C direction.

[0017] In the figure: 1. Tank truck pipe; 2. Loading and unloading pipe; 3. Valve pipe; 4. Installation cover; 5. Limiting member; 6. Sealing plate; 7. Limiting block; 8. Valve column; 9. Gear one; 10. Rack one; 11. Rack two; 12. Spring; 13. Push rod; 14. Block; 15. Telescopic groove; 16. Ball valve; 17. Slide groove; 18. Blocking block; 19. Tooth plate one; 20. Tooth plate two; 21. Gear two; 22. Push plate; 23. Sealing semi-ring; 24. Unlocking groove; 25. Card slot; 26. Rotating groove; 27. Sealing ring; 28. Accommodating groove; 29. Guide rod; 30. Limiting ring; 31. Inclined groove. Specific embodiments

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0019] Referring to Figures 1 - 6 , a liquid hazardous chemical tank truck loading and unloading platform includes a tank truck pipe 1 installed on the tank truck and a loading and unloading pipe 2 for loading and unloading the liquid in the tank truck. The front side of the loading and unloading pipe 2 is provided in a frustum shape (referring to Figure 1), further comprising: a valve pipe 3, which is fixedly connected to the tank truck pipe 1, and further comprising a mounting cover 4, which is fixedly arranged on one side of the tank truck pipe 1. A limiting member 5 is fixedly installed on the tank truck pipe 1. The limiting member 5 is arc-shaped, and the center of its arc is on the same horizontal line as the center of the end face of the tank truck pipe 1.

[0020] It further comprises a control valve structure, which is installed between the tank truck pipe 1 and the mounting cover 4 and is used to control the discharge of the liquid in the tank truck. The control valve structure includes a sliding hole opened on the tank truck pipe 1. A push rod 13 is slidably arranged in the sliding hole. A sealing plate 6 is fixedly installed on the loading and unloading pipe 2. A limiting block 7 is fixedly installed on the sealing plate 6. A slot is opened on the limiting block 7, and the depth of the slot is relatively shallow (only for illustration in the figure, the purpose is to enable the limiting block 7 to better push the push rod 13 in the horizontal direction, and this setting can also facilitate the separation of the push rod 13 from the slot). The push rod 13 is slidably arranged in the sliding groove 17 and the sliding hole and is used in cooperation with the slot. When it is necessary to connect the tank truck pipe 1 and the loading and unloading pipe 2, at this time, the limiting block 7 is slid in the sliding groove 17 for use, which can realize the installation positioning of the loading and unloading pipe 2 and prevent it from being misaligned.

[0021] On the front side of the push rod 13, a first rack 10 and a second rack 11 with opposite directions are arranged. The first rack 10 and the second rack 11 are horizontally staggered. Two springs 12 are jointly installed between the mounting cover 4 and the push rod 13. A valve stem 8 is sealingly rotatably installed on the valve pipe 3. A first gear 9 is fixedly installed at one end of the valve stem 8 outside the valve pipe 3, and the first gear 9 meshes with the first rack 10 and the second rack 11 alternately. A spherical valve 16 is fixedly installed at one end of the valve stem 8 inside the valve pipe 3, and the spherical valve 16 is sealingly rotatable in the valve pipe 3.

[0022] Push the push rod 13 to move H (H is a set length, and using a symbol here is convenient for describing the length later). At this time, the first rack 10 meshes with the first gear 9 and drives it to rotate 90°. The rotation of the first rack 10 drives the spherical valve 16 to rotate through the valve stem 8, so that the valve pipe 3 is in a communicating state. Then, push the push rod 13 to move L. At this time, the first gear 9 rotates reversely by 90°, and drives the spherical valve 16 to block the valve pipe 3 through the valve stem 8. This process completes the closing of the valve pipe 3. The elastic force of the two springs 12 is not enough to drive the push rod 13 to move far away. When the above steps are completed, at this time, pull up the push rod 13, so that the push rod 13 is pushed to the initial position under the elastic force of the spring 12 and is in the Figure 4 state again. A wedge block can also be arranged on the side of the push rod 13 close to the spring 12, and a wedge block matching it is also fixedly arranged in the mounting cover 4. The two wedge blocks are staggered. When they are in contact, under the action of force, the push rod 13 will slide upward relative to the wedge block fixed in the mounting cover 4. At this time, the automatic rebound of the push rod 13 can be realized.

[0023] Refer to Figures 5 - 10, and also includes a sealing connection structure, which is arranged between the tank car pipe 1 and the loading and unloading pipe 2, and adopts a quick plug-in and rotating buckle method to quickly connect and separate the tank car pipe 1 and the loading and unloading pipe 2. When the connection is completed, the main seal and the dynamic compensation double-stage sealing system jointly seal the connection of the circulating liquid, and cooperate with the valve control structure to realize the connection valve opening and separation valve closing. The sealing connection structure includes a plurality of extrusion grooves opened on the inner side of the tank car pipe 1, and a card block 14 is slidably installed in the plurality of extrusion grooves. Fixed blocks are fixedly arranged on both sides of the plurality of card blocks 14. When the two fixed blocks are set, the card block 14 will not be separated from the tank car pipe 1, and the main sealing component is installed in the tank car pipe 1.

[0024] The main sealing component includes a telescopic groove 15 and a plurality of displacement grooves provided in the tank tube 1. The plurality of displacement grooves are connected to the telescopic groove 15. A stop block 18 is slidably installed in each displacement groove. The width and thickness of the stop block 18 are smaller than the block 14. A gear 21 is rotatably installed in each displacement groove. A tooth plate 19 is fixedly installed at one end of each stop block 18 away from each other. A push plate 22 is slidably installed in each displacement groove. A tooth plate 20 is fixedly installed at one end of each push plate 22 away from each other, and each gear 21 is meshed with the corresponding tooth plate 19 and tooth plate 20. A sealing semi-ring 23 is fixedly installed at one end of each push plate 22 close to each other. The sealing semi-ring 23 slides in the telescopic groove 15. Multiple sealing semi-rings 23 are sealed and connected to each other to form a circle.

[0025] The loading and unloading tube 2 is provided with an inclined groove 31, a plurality of unlocking grooves 24, a plurality of card slots 25 and a plurality of rotating grooves 26. Each unlocking groove 24 is communicated with the corresponding card slot 25 and the corresponding rotating groove 26. The card block 14 can be engaged in the card slot 25, and the stop block 18 can be engaged in the rotating groove 26 for use. Pushing the loading and unloading tube 2 horizontally toward the tank vehicle pipe 1 can realize the engagement of the card block 14 with the card slot 25, and realize the installation of the loading and unloading tube 2 and the tank vehicle pipe 1. Pushing the loading and unloading tube 2 forward again can make the card block 14 slide at the position of the inclined groove 31. At this time, the stop block 18 reaches the position of the rotating groove 26. Then, the loading and unloading tube 2 is rotated and pulled in the direction away from the tank vehicle pipe 1. At this time, the stop block 18 and the card block 14 both slide in the unlocking groove 24, and the loading and unloading tube 2 and the tank vehicle pipe 1 are separated. The lower ends of the plurality of card blocks 14 and the plurality of stop blocks 18 are wedge-shaped, and the grooves used therewith are also of the same shape.

[0026] A sealing ring 27 is fixedly installed on the loading and unloading pipe 2, and the sealing ring 27 is located at the inclined groove 31. The sealing ring 27 cooperates with the multiple sealing semi-rings 23 to perform the main sealing. A compensating sealing component is installed on the loading and unloading pipe 2. The compensating sealing component includes multiple receiving grooves 28 and multiple circular grooves opened on the loading and unloading pipe 2. The multiple circular grooves are connected with the corresponding rotating grooves 26 and the corresponding receiving grooves 28. Guide rods 29 are slidably installed in the multiple circular grooves. Limiting rings 30 are fixedly installed on the multiple guide rods 29. The diameter of the limiting ring 30 is larger than the diameter of the guide rod 29, which can prevent the guide rod 29 from escaping from the circular groove. The multiple receiving grooves 28 and the circular grooves are filled with buffers. The buffer can be a liquid with a higher density such as hydraulic oil, which can effectively prevent the grooves from escaping. There is shaking between the vehicle tube 1 and the loading and unloading tube 2, and the inner side of the sealing ring 27 is at the outlet position of the accommodating groove 28. The outlet position of the accommodating groove 28 is annular, and the outlet width of the accommodating groove 28 is much smaller than the width of the sealing ring 27. This arrangement ensures the hardness of the sealing ring 27 (the connecting part between the sealing ring 27 and the loading and unloading tube 2 has a certain supporting force to prevent large shaking between the tank vehicle tube 1 and the loading and unloading tube 2) while utilizing the elasticity of the sealing ring 27 to improve the sealing effect (and the elastic expansion and contraction of the sealing ring 27 can buffer the impact force generated when the liquid is released). When the block 14 enters the position of the card slot 25, it will squeeze the guide rod 29. At this time, the guide rod 29 squeezes the liquid in the accommodating groove 28 to expand toward the sealing ring 27.

[0027] It is further explained that the above-mentioned fixed connection should be understood in a broad sense unless otherwise clearly specified and limited. For example, it can be welding, gluing, or one-piece molding, etc., which are conventional means well known to those skilled in the art.

[0028] The specific operation steps of the present invention are as follows: Connect the tank car pipe 1 and the loading and unloading pipe 2: place the limit block 7 in the slide groove 17 on the limit member 5, and push H in the direction of the tank car pipe 1 along the direction of the slide groove 17. The truncated cone setting of the loading and unloading pipe 2 can make the block 14 and the stop block 18 successively abut against its outer side along its end and slide smoothly along its outer side. In this process, the block 14 will slide in the displacement groove. When the stop block 18 slides along the outer side of the loading and unloading pipe 2 into the slot 25, the stop block 18 reaches the cylindrical area between the slot 25 and the truncated cone end of the loading and unloading pipe 2. The stop block 18 is in this position. The initial positions are slid in the direction away from each other. In this process, the gear plate 19 drives the gear 21 to rotate. The gear 21 rotates through the gear plate 20 to drive the push plate 22 to slide in the direction of approaching each other, so that the multiple sealing half rings 23 are close to each other until the card block 14 is engaged in the card slot 25 (this process will produce a card sound and a sense of frustration, so that the staff can feel whether the connection is successful). At this time, the multiple sealing half rings 23 form a circle, which is tightly attached to the sealing ring 27, so as to achieve the main seal between the tank car pipe 1 and the loading and unloading pipe 2; During this process, the limit block 7 pushes the push rod 13 to move H. At this time, the gear rod 10 meshes with the gear 9 and drives it to rotate 90°. The gear rod 10 rotates through the valve column 8 to drive the ball valve 16 to rotate, so that the valve pipe 3 is in a connected state, and the liquid in the tank truck is discharged. When the liquid in the tank truck is unloaded, a large impact force will be generated on the loading and unloading pipe 2, causing the loading and unloading pipe 2 to want to separate from the tank truck pipe 1, thereby generating a pulling force, causing the block 14 to be squeezed toward the guide rod 29. At this time, since the buffer solution filled in the receiving groove 28 and the circular groove is in a gapless state, the buffer solution is squeezed toward the sealing ring 27, so that a dynamic seal is formed between the sealing ring 27 and the multiple sealing half rings 23, and the sealing surface fit is automatically adjusted to ensure that the sealing structure will not leak when the pressure fluctuates.

[0029] When the unloading is completed, the tank car pipe 1 and the loading and unloading pipe 2 need to be disassembled: push L in the direction of the tank car pipe 1 along the direction of the slide groove 17, and the push rod 13 will also move L under the action of the limit block 7. At this time, the gear 1 9 rotates 90° in the opposite direction, and drives the ball valve 16 to block the valve pipe 3 through the valve column 8. This process completes the closure of the valve pipe 3; in this process, the block 14 will slide along the surface of the card groove 25 to the inclined groove 31 under the action of the force, and the block 18 will reach the rotating groove 26. When it is impossible to continue When the loading and unloading pipe 2 is continuously pushed forward, the loading and unloading pipe 2 is rotated so that the stop block 18 is rotated to the area of ​​the unlocking groove 24 and cannot be rotated. The limit block 7 is also separated from the slide groove 17 at this time. At this time, the loading and unloading pipe 2 is pulled away from the tank car pipe 1. The stop block 18 and the clamping block 14 both slide along the length direction of the unlocking groove 24 (the length direction of the loading and unloading pipe 2), which can realize the separation of the loading and unloading pipe 2 and the tank car pipe 1 after closing the valve, eliminate liquid residue or accidental leakage, and effectively avoid safety accidents caused by operator misoperation.

[0030] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A loading and unloading platform for a liquid hazardous chemical tanker, comprising a tanker pipe (1) and a loading and unloading pipe (2) installed on the tanker, characterized in that, Also includes: A valve pipe (3) which is fixedly connected to the tank car pipe (1); A mounting cover (4) is fixedly mounted on the tank car pipe (1), and a limiting member (5) is fixedly mounted on the tank car pipe (1); A control valve structure, which is installed between the tank truck pipe (1) and the installation cover (4) and is used to control the discharge of liquid in the tank truck; A sealing connection structure is provided between a tank vehicle pipe (1) and a loading and unloading pipe (2), and uses a quick plug-in and a rotating buckle method to quickly connect and separate the tank vehicle pipe (1) and the loading and unloading pipe (2). When the connection is completed, the main seal and the dynamic compensation double-stage sealing system jointly seal the connection of the circulating liquid, and work in conjunction with the control valve structure to realize connection valve opening and separation valve closing.

2. The loading and unloading platform for liquid hazardous chemicals tank trucks according to claim 1, characterized in that, A sealing plate (6) is fixedly mounted on the loading and unloading tube (2), a limiting block (7) is fixedly mounted on the sealing plate (6), and a slot is provided on the limiting block (7).

3. The loading and unloading platform for liquid hazardous chemicals tank trucks according to claim 2, characterized in that, The limiting member (5) is provided with a sliding groove (17), which is L-shaped as a whole and is used for the sliding of the limiting block (7).

4. The loading and unloading platform for liquid hazardous chemicals tank trucks according to claim 3, characterized in that, The control valve structure comprises a sliding hole formed on a tank car pipe (1), a push rod (13) being slidably arranged in the sliding hole, the push rod (13) being slidably arranged in a sliding groove (17) and in the sliding hole for use in conjunction with a slot, a gear rod 1 (10) and a gear rod 2 (11) being arranged in opposite directions on the front side of the push rod (13), the gear rod 1 (10) and the gear rod 2 (11) being arranged horizontally and staggered, and two springs (12) being installed between the mounting cover (4) and the push rod (13).

5. A liquid hazardous chemical tank truck loading and unloading platform according to claim 4, characterized in that, A valve column (8) is rotatably mounted on the valve tube (3); a gear 1 (9) is fixedly mounted on one end of the valve column (8) located outside the valve tube (3); and the gear 1 (9) is alternately meshed with a gear rod 1 (10) and a gear rod 2 (11) for use; a ball valve (16) is fixedly mounted on one end of the valve column (8) located inside the valve tube (3); and the ball valve (16) is rotatably mounted in the valve tube (3).

6. The loading and unloading platform for liquid hazardous chemicals tank trucks according to claim 1, characterized in that, The sealing connection structure comprises a plurality of extrusion grooves formed on the inner side of the tank tube (1), a clamping block (14) being slidably mounted in each of the plurality of extrusion grooves, and a fixing block being fixedly mounted on both sides of each of the plurality of clamping blocks (14). When the two fixing blocks are arranged, the clamping block (14) will not be separated from the tank tube (1), and a main sealing component is mounted in the tank tube (1).

7. A loading and unloading platform for a tank truck of liquid hazardous chemicals according to claim 6, characterized in that, The main sealing component includes a telescopic groove (15) formed in the tank truck pipe (1) and a plurality of displacement grooves. The plurality of displacement grooves communicate with the telescopic groove (15). A resisting block (18) is slidably installed in each displacement groove. The width and thickness of the resisting block (18) are both smaller than those of the clamping block (14). A second gear (21) is rotatably installed in each displacement groove. A first toothed plate (19) is fixedly installed at one end of each resisting block (18) away from each other. A pushing plate (22) is slidably installed in each displacement groove. A second toothed plate (20) is fixedly installed at one end of each pushing plate (22) away from each other. Each second gear (21) meshes with the corresponding first toothed plate (19) and the second toothed plate (20). A sealing semi-ring (23) is fixedly installed at one end of each pushing plate (22) close to each other. The sealing semi-ring (23) slides in the telescopic groove (15). The plurality of sealing semi-rings (23) are hermetically connected to each other in pairs and form a circle.

8. A loading and unloading platform for liquid hazardous chemicals tank trucks according to claim 7, characterized in that, The loading and unloading pipe (2) is provided with an inclined groove (31), a plurality of unlocking grooves (24), a plurality of clamping grooves (25) and a plurality of rotating grooves (26). Each unlocking groove (24) communicates with the corresponding clamping groove (25) and the corresponding rotating groove (26). The clamping block (14) can be clamped in the clamping groove (25), and the resisting block (18) can be used by being clamped in the rotating groove (26). Horizontally pushing the loading and unloading pipe (2) towards the tank truck pipe (1) can realize the clamping of the clamping block (14) and the clamping groove (25), and realize the installation of the loading and unloading pipe (2) and the tank truck pipe (1). Further pushing the loading and unloading pipe (2) forward can make the clamping block (14) slide at the position of the inclined groove (31). At this time, the resisting block (18) reaches the position of the rotating groove (26). Then rotate the loading and unloading pipe (2) and pull it in the direction away from the tank truck pipe (1). At this time, both the resisting block (18) and the clamping block (14) slide in the unlocking groove (24), realizing the separation of the loading and unloading pipe (2) and the tank truck pipe (1). The lower ends of the plurality of clamping blocks (14) and the plurality of resisting blocks (18) are both wedge-shaped, and the grooves used in cooperation are also of the same shape.

9. The loading and unloading platform for liquid hazardous chemicals tank trucks according to claim 8, characterized in that, A sealing ring (27) is fixedly installed on the loading and unloading pipe (2), and the sealing ring (27) is located at the inclined groove (31). The sealing ring (27) and the plurality of sealing semi-rings (23) cooperate for main sealing. A compensation sealing component is installed on the loading and unloading pipe (2).

10. A liquid hazardous chemical tank truck loading and unloading platform according to claim 9, characterized in that, The compensation sealing component includes a plurality of receiving grooves (28) and a plurality of circular grooves formed in the loading and unloading pipe (2). The plurality of circular grooves communicate with the corresponding rotating grooves (26) and the corresponding receiving grooves (28). A guide rod (29) is slidably installed in each of the plurality of circular grooves. A limiting ring (30) is fixedly installed on each of the plurality of guide rods (29). The plurality of receiving grooves (28) and the circular grooves are filled with buffer liquid, and the inner side of the sealing ring (27) is at the outlet position of the receiving groove (28). When the clamping block (14) enters the position of the clamping groove (25), it will squeeze the guide rod (29). At this time, the guide rod (29) squeezes the liquid in the receiving groove (28) and expands towards the sealing ring (27).

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