Method for operating a loading and unloading hose insertion slot vehicle

Abstract

The present application relates to the technical field of the crane pipe, and discloses an operation method for loading and unloading a crane pipe into a slot car, comprising the following steps: 1), controlling the vertical pipe to move downwards into the tank opening of the slot car; 2), when the vertical pipe drives the sealing cap to contact the tank opening of the slot car, the vertical pipe continues to move downwards; 3), when the sealing cap contacts the limit switch, the vertical pipe stops moving downwards; 4), the sealing ring is deformed by the inclined extrusion of the sealing cap, and the vertical pipe does not deviate out of the tank opening with the inclination of the slot car; 5), the loading is completed, the vertical pipe is controlled to be separated from the tank opening, and the sealing cap is reset under the extension of the spring mechanism. Under the premise of ensuring that the sealing cap seals the tank opening of the slot car, the sealing cap reduces the impact force when the sealing cap contacts the tank opening of the slot car in the downward process of the vertical pipe during loading by the spring mechanism, avoids the force conflict between the upward and downward movements of the two, and prevents the crane pipe or the slot car from being damaged. The sealing cap reduces the influence of the inclination of the slot car on the vertical pipe during loading by the sealing ring.

Description

Technical Field

[0001] The present invention relates to the technical field of crane pipes, and in particular to an operating method for loading and unloading crane pipes and inserting them into a tank truck. Background Art

[0002] Crane pipe is a pipe used for liquid loading and unloading in the petroleum industry, chemical industry, docks, etc. It has the characteristics of mobility, scalability, high safety and sensitivity.

[0003] Hoist pipes are commonly used in the petrochemical industry for fluid loading and unloading. Also known as "fluid loading arms," ​​these arms utilize a rotary joint, rigid pipe, and elbow connections to transfer liquids between trains, tank trucks, and trestle storage and transportation pipelines. These replace outdated hose connections and are ideal specialized equipment for fluid loading and unloading.

[0004] When transporting oil, it is necessary to insert the vertical pipe into the tank mouth of the tank truck. In order to avoid wasting oil and gas, a sealing cap is often provided on the vertical pipe to seal the tank mouth of the tank truck. Patent application number "202221513962.3" discloses a top loading cylinder compression type closed loading crane pipe: by setting a loading crane pipe body, it is suitable for the loading crane pipe body to be sealed for loading, so as to achieve the function of sealing the filling port and recovering oil and gas. The cylinder body is used to drive the outer arm and the conical sealing cap to be pressed against the upper part of the filling port. A pull rod with the same length as the outer arm is used to ensure the verticality of the vertical pipe of the crane pipe, providing a stable and reliable pressing force for the upper conical sealing cap. The operation is simple, and the pressing force acts between the sealing component and the filling port. The pressing force of the sealing component on the filling port is stable and reliable, and the pressing force can overcome adverse factors such as the oil and gas pressure in the tank truck and the settlement of the tank truck. The sealing effect fully meets the requirements of relevant regulations. The sealing component is driven by the cylinder body to seal, and can continuously follow up the filling port to provide stable sealing requirements.

[0005] However, there are various external forces that interfere with the sealing surface, such as the height changes of the tank truck itself when it is empty or loaded, the shaking of the crane pipe at low liquid level caused by high-speed flow of liquid, and the up and down movement of the crane pipe at high liquid level. In order to seal, the existing equipment has been applying a continuous downward force to the sealing cap, which conflicts with the shaking and up and down movement forces, making the crane pipe easily damaged by the conflicting forces, affecting the use of the crane pipe. Summary of the Invention

[0006] The purpose of the present invention is to provide an operating method for loading and unloading a crane pipe and inserting it into a tank truck, aiming to solve the problem in the prior art that in the process of the crane pipe driving the sealing cap to seal, there is a conflict between the upper and lower forces, which can easily cause damage to the crane pipe or the tank truck.

[0007] The present invention is implemented as follows: an operating method for loading and unloading a crane pipe into a tank truck comprises the following steps:

[0008] 1) Open the tank cover on the tank opening of the tank truck, expose the tank opening, and control the vertical pipe to move downward into the tank opening of the tank truck through the loading and unloading process control system;

[0009] 2) A sealing cap is arranged around the outer circumference of the vertical tube, and a spring mechanism is provided on the vertical tube. The vertical tube is connected to the sealing cap via the spring mechanism. When the vertical tube drives the sealing cap to contact the tank mouth of the tank truck, the sealing cap stops moving, the vertical tube continues to move downward, and the spring mechanism tightens.

[0010] 3) A limit switch is installed on the outer periphery of the vertical pipe, and the limit switch is electrically connected to the loading and unloading process control system; when the vertical pipe continues to move downward to a set distance, the sealing cap contacts the limit switch and the vertical pipe stops moving downward;

[0011] 4) A sealing ring that is squeezed and deformed is installed between the spring mechanism and the sealing cap. The loading and unloading vehicle process control system controls the vertical pipe to input liquid into the tank opening. As the amount of liquid changes, the tank truck tilts slightly, and the sealing cap tilts with the tank opening. A gap is reserved between the spring mechanism and the vertical pipe. The sealing ring is squeezed and deformed by the tilt of the sealing cap, and the vertical pipe will not deviate from the tank opening as the tank truck tilts;

[0012] 5) After loading is completed, the loading and unloading process control system controls the vertical pipe to separate from the tank mouth, and the sealing cap is reset under the extension of the spring mechanism.

[0013] Furthermore, the spring mechanism includes a fixing ring and a pressure ring. The fixing ring is fixed around the outer circumference of the vertical tube. The fixing ring is connected to the pressure ring through a spring column. The pressure ring and the sealing ring are fixed to the sealing cap through bolts.

[0014] Furthermore, the top end surface of the sealing ring abuts against the bottom of the pressure ring, and the bottom end surface of the sealing ring abuts against the top of the sealing cap, and the pressure ring and the sealing cap are arranged with an upper and lower interval; the fixing ring and the pressure ring are arranged with a relative interval longitudinally, and the fixing ring is located above the pressure ring.

[0015] Furthermore, a compression area for the spring column to be compressed and deformed is formed between the fixing ring and the pressure ring, and a plurality of spring columns are arranged at intervals around the circumference of the extended compression area.

[0016] Furthermore, the limit switch and the sealing cap are arranged longitudinally opposite to each other, and the limit switch is located above the sealing cap.

[0017] Furthermore, the limit switch includes a switch seat and a driving rod that controls the vertical tube to stop moving downward. One end of the driving rod is hingedly mounted on the switch seat, and the switch seat is mounted on the outer periphery of the vertical tube. The other end of the driving rod is mounted with a guide wheel, and the guide wheel is exposed above the sealing cap.

[0018] Furthermore, the switch seat is mounted on the fixing ring, the sealing cap is connected to a ventilation pipe, and the ventilation pipe is longitudinally inserted into the top of the sealing cap.

[0019] Furthermore, the vertical tube has a flow channel that runs through the upper and lower parts, and a sealing tube that moves up and down is provided in the flow channel. The bottom of the sealing tube is arranged in a closed manner to seal the bottom opening of the flow channel; a plurality of liquid outlet holes are provided on the outer side of the bottom of the sealing tube, and the top of the sealing tube is connected to the inner wall of the flow channel through a plurality of spring expansion strips, and the plurality of spring expansion strips are arranged at intervals along the circumference of the top of the sealing tube.

[0020] Furthermore, the blocking tube has a buffer channel running through from top to bottom, and an elastically deformable buffer diaphragm is provided at the bottom of the buffer channel. The buffer diaphragm blocks the bottom opening of the blocking tube, and the flow channel is connected to the liquid outlet through the buffer channel, and the liquid outlet is connected to the outside; the bottom of the spring expansion strip is connected to the top opening of the blocking tube, and the top of the spring expansion strip is connected to the inner wall of the flow channel;

[0021] When liquid is input into the flow channel of the vertical tube, the blocking tube is impacted by the liquid flow, and the buffer diaphragm is deformed by the impact, driving the bottom of the blocking tube to move downward, the spring expansion strip extends and becomes longer, and the liquid outlet is exposed outside the vertical tube.

[0022] Furthermore, an extruded and deformed sealing ring is provided on the outer side of the bottom of the sealing tube. The sealing ring is arranged circumferentially along the outer periphery of the bottom of the sealing tube. The top of the sealing ring is arranged in an arc angle from the inside to the outside, and the bottom of the sealing ring is arranged in a flat shape. The bottom of the sealing ring is arranged flush with the bottom of the sealing tube.

[0023] A plurality of rolling balls are provided on the outer circumference of the blocking tube. The plurality of balls are spaced around the circumference of the blocking tube and are sequentially spaced in the longitudinal direction of the blocking tube. The balls are embedded in the outer circumference of the blocking tube. A plurality of longitudinal grooves are formed on the inner side wall of the flow channel, facing away from the blocking tube. The plurality of longitudinal grooves are spaced around the circumference of the flow channel. The balls are at least partially movably abutted in the longitudinal grooves of the flow channel.

[0024] When the vertical tube is completely filled with liquid, the spring expansion strip uses its own elastic force to pull the blocking tube back into the flow channel, and the bottom of the blocking tube is arranged flush with the bottom of the vertical tube.

[0025] Compared with the prior art, the operating method for loading and unloading a crane pipe and inserting it into a tank truck provided by the present invention, under the premise of ensuring that the sealing cap seals the tank mouth of the tank truck, reduces the impact force when the sealing cap contacts the tank mouth of the tank truck during the descending process of the vertical pipe during loading through a spring mechanism, thereby avoiding the conflict of up and down forces between the two that may cause damage to the crane pipe or the tank truck, and the sealing cap reduces the influence of the tank truck tilt on the vertical pipe during loading through the sealing ring; solves the problem that the conflict of up and down forces in the process of the crane pipe driving the sealing cap to seal can easily cause damage to the crane pipe or the tank truck; the limit switch can prevent the vertical pipe from excessively extending into the tank mouth of the tank truck, thereby preventing the vertical pipe from damaging the tank truck. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a flow chart of the operation method for loading and unloading a crane pipe into a tank truck provided by the present invention;

[0027] Figure 2 It is a three-dimensional schematic diagram of the vertical pipe and the sealing cap provided by the present invention;

[0028] Figure 3 It is a schematic diagram of the cross-section structure of the vertical pipe and the sealing cap provided by the present invention;

[0029] Figure 4 This invention Figure 3 A is an enlarged schematic diagram.

[0030] In the figure: vertical pipe 10, sealing cap 20, spring mechanism 30, sealing ring 40, limit switch 50, ventilation pipe 60, blocking pipe 70, flow channel 11, spring expansion strip 12, fixing ring 31, pressure ring 32, spring column 33, switch seat 51, driving rod 52, guide wheel 53, liquid outlet 71, buffer channel 72, buffer diaphragm 73, blocking ring 74, ball 75. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0032] The implementation of the present invention is described in detail below with reference to specific embodiments.

[0033] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "up", "down", "left", "right", etc. indicate directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0034] Reference Figure 1-4 The figure shows a preferred embodiment of the present invention.

[0035] The operation method for loading and unloading a crane pipe into a tank truck comprises the following steps:

[0036] 1) Open the tank cover on the tank opening of the tank truck, exposing the tank opening, and control the vertical pipe 10 to move downward into the tank opening of the tank truck through the loading and unloading process control system;

[0037] 2) A sealing cap 20 is arranged around the outer circumference of the drop tube 10. A spring mechanism 30 is provided on the drop tube 10. The drop tube 10 is connected to the sealing cap 20 via the spring mechanism 30. When the drop tube 10 drives the sealing cap 20 to contact the tank opening of the tank truck, the sealing cap 20 stops moving, the drop tube 10 continues to move downward, and the spring mechanism 30 tightens.

[0038] 3) A limit switch 50 is installed on the outer periphery of the drop tube 10, and the limit switch 50 is electrically connected to the loading and unloading process control system; when the drop tube 10 continues to move downward to a set distance, the sealing cap 20 contacts the limit switch 50, and the drop tube 10 stops moving downward;

[0039] 4) A sealing ring 40 that is squeezed and deformed is installed between the spring mechanism 30 and the sealing cap 20. The loading and unloading process control system controls the drop pipe 10 to input liquid into the tank opening. As the liquid load changes, the tank truck tilts slightly, and the sealing cap 20 tilts with the tank opening. A gap is reserved between the spring mechanism 30 and the drop pipe 10. The sealing ring 40 is squeezed and deformed by the tilt of the sealing cap 20, and the drop pipe 10 will not deviate from the tank opening as the tank truck tilts;

[0040] 5) After loading is completed, the loading and unloading process control system controls the vertical pipe 10 to separate from the tank mouth, and the sealing cap 20 is reset under the extension of the spring mechanism 30.

[0041] The above-mentioned operating method for loading and unloading the crane pipe and inserting it into the tank truck, under the premise of ensuring that the sealing cap 20 seals the tank mouth of the tank truck, reduces the impact force when the sealing cap 20 contacts the tank mouth of the tank truck during the descending process of the vertical pipe 10 during loading through the spring mechanism 30, thereby avoiding the conflict of up and down forces between the two that may cause damage to the crane pipe or the tank truck, and the sealing cap 20 reduces the influence of the tank truck tilt on the vertical pipe 10 during the loading process through the sealing ring 40; solves the problem that the vertical force conflict in the process of the crane pipe driving the sealing cap 20 to seal can easily cause damage to the crane pipe or the tank truck; the limit switch 50 can prevent the vertical pipe 10 from excessively extending into the tank mouth of the tank truck, thereby preventing the vertical pipe 10 from damaging the tank truck.

[0042] In this embodiment, the spring mechanism 30 includes a retaining ring 31 and a pressure ring 32. The retaining ring 31 is fixed around the outer circumference of the drop tube 10 and connected to the pressure ring 32 via spring columns 33. The pressure ring 32 and the sealing ring 40 are fixed to the sealing cap 20 via bolts. Thus, when the sealing cap 20 is obstructed by the tank opening of the tank truck, the sealing cap 20 will move in the opposite direction relative to the drop tube 10. The elasticity of the spring columns 33 cushions the conflict between the sealing cap 20 and the tank opening, thus preventing damage to the drop tube or the tank truck.

[0043] In this embodiment, the top end surface of the sealing ring 40 abuts against the bottom of the pressure ring 32, and the bottom end surface of the sealing ring 40 abuts against the top of the sealing cap 20, and the pressure ring 32 and the sealing cap 20 are arranged with an upper and lower interval; the fixing ring 31 and the pressure ring 32 are arranged with relative intervals in the longitudinal direction, and the fixing ring 31 is located above the pressure ring 32; in this way, the pressure ring 32 can use the fixing ring 31 as a buffer support point during the process of sliding up and down.

[0044] When the tank truck starts to load, the vehicle sometimes tilts slightly as the amount of liquid loaded changes, and the sealing cap 20 tilts with the tank mouth. Since there is a gap between the pressure ring 32 and the vertical pipe 10, and the material of the sealing ring 40 is soft, the vertical pipe 10 will not move with the tilt of the vehicle while ensuring sealing.

[0045] In this embodiment, the interval between the fixing ring 31 and the pressure ring 32 forms a compression area for the spring columns 33 to be compressed and deformed, and a plurality of spring columns 33 are arranged at intervals around the circumference of the extended compression area.

[0046] In this way, the pressure ring 32 can further buffer the conflict between the sealing cap 20 and the up and down movement of the tank mouth through the elasticity of the multiple spring columns 33, thereby avoiding damage to the crane pipe or tank truck.

[0047] In this embodiment, the limit switch 50 and the sealing cap 20 are arranged opposite to each other in the longitudinal direction, and the limit switch 50 is located above the sealing cap 20 .

[0048] In this way, the sealing cap 20 may touch the limit switch 50 during the process of moving upward relative to the vertical tube 10 .

[0049] In this embodiment, the limit switch 50 includes a switch base 51 and a driving rod 52 that controls the vertical tube 10 to stop moving downward. One end of the driving rod 52 is hingedly mounted on the switch base 51, and the switch base 51 is mounted on the outer periphery of the vertical tube 10. The other end of the driving rod 52 is mounted with a guide wheel 53, and the guide wheel 53 is exposed above the sealing cap 20.

[0050] The limit switch 50 contacts the sealing cap 20 through the guide wheel 53 to reduce the friction resistance between the driving rod 52 and the sealing cap 20. When the sealing cap 20 pushes the guide wheel 53 upward, the guide wheel 53 drives the driving rod 52 to control the vertical pipe 10 to stop moving downward.

[0051] In this embodiment, the switch seat 51 is mounted on the fixing ring 31 , and the sealing cap 20 is connected to a ventilation pipe 60 , which is longitudinally inserted into the top of the sealing cap 20 .

[0052] Like this, the unnecessary gas in the tank car can be discharged through the vent pipe 60 in the tank mouth of the tank car.

[0053] In this embodiment, the vertical tube 10 has a flow channel 11 that runs through the upper and lower parts. A sealing tube 70 that moves up and down is provided in the flow channel 11. The bottom of the sealing tube 70 is closed to seal the bottom opening of the flow channel 11. A plurality of liquid outlet holes 71 are provided on the outer side of the bottom of the sealing tube 70. The top of the sealing tube 70 is connected to the inner wall of the flow channel 11 through a plurality of spring expansion strips 12. The plurality of spring expansion strips 12 are arranged circumferentially and spaced apart along the top of the sealing tube 70.

[0054] When the drop pipe 10 injects liquid into the tank truck filling port through the flow channel 11, the liquid enters the blocking tube 70 through the flow channel 11. When the blocking tube 70 is impacted by the downward flow of the liquid, the lower portion of the blocking tube 70 slides out of the drop pipe 10 and emerges from the tank truck filling port. The blocking tube 70 uses multiple liquid outlet holes 71 to allow the liquid to flow into the tank truck filling port. When the liquid injection is completed, the drop pipe 10 uses multiple spring expansion strips 12 to pull the blocking tube 70 back into the flow channel 11.

[0055] The vertical pipe 10 uses the sealing tube 70 to reduce the DC impact force of the liquid on the bottom of the tank truck, thereby realizing the automatic retraction of the sealing tube 70; the sealing tube 70 can not only realize automatic extension and retraction, but also be easy to operate, making the vertical pipe 10 smaller in size; the sealing tube 70 can also prevent the residual liquid in the vertical pipe 10 from dripping.

[0056] In this embodiment, the blocking tube 70 has a buffer channel 72 extending vertically therethrough. An elastically deformable buffer diaphragm 73 is provided at the bottom of the buffer channel 72. The buffer diaphragm 73 blocks the bottom opening of the blocking tube 70. The flow channel 11 is connected to the liquid outlet 71 through the buffer channel 72, and the liquid outlet 71 is connected to the outside. The bottom of the spring expansion strip 12 is connected to the top opening of the blocking tube 70, and the top of the spring expansion strip 12 is connected to the inner wall of the flow channel 11.

[0057] When liquid is input into the flow channel 11 of the vertical tube 10, the blocking tube 70 is impacted by the liquid flow, and the buffer diaphragm 73 is deformed by the impact, driving the bottom of the blocking tube 70 to move downward, the spring expansion strip 12 extends and becomes longer, and the liquid outlet 71 is exposed outside the vertical tube 10.

[0058] The blocking pipe 70 utilizes the buffer diaphragm 73 to further reduce the downward flow impact force of the liquid, thereby increasing the protection of the blocking pipe 70 and achieving that the blocking pipe 70 reduces the direct current impact force of the liquid on the bottom of the tank truck.

[0059] In this embodiment, an extruded and deformed sealing ring 74 is provided on the outer side of the bottom of the sealing tube 70. The sealing ring 74 is arranged circumferentially along the outer periphery of the bottom of the sealing tube 70. The top of the sealing ring 74 is arranged in an arc angle from the inside to the outside, and the bottom of the sealing ring 74 is arranged in a flat shape. The bottom of the sealing ring 74 is arranged flush with the bottom of the sealing tube 70.

[0060] A plurality of rolling balls 75 are provided on the outer circumference of the blocking tube 70. The plurality of balls 75 are spaced circumferentially around the outer circumference of the blocking tube 70 and spaced sequentially along the longitudinal direction of the blocking tube 70. The balls 75 are embedded in the outer circumference of the blocking tube 70. A plurality of longitudinal grooves are formed on the inner side wall of the flow channel 11, facing away from the blocking tube 70. The plurality of longitudinal grooves are spaced circumferentially around the flow channel 11. The balls 75 are at least partially movable and abut against the longitudinal grooves of the flow channel 11.

[0061] When the vertical tube 10 is completely filled with liquid, the spring expansion strip 12 uses its own elastic force to pull the blocking tube 70 back into the flow channel 11 , and the bottom of the blocking tube 70 is arranged flush with the bottom of the vertical tube 10 .

[0062] When the blocking tube 70 is retracted into the drop tube 10, the blocking ring 74 can cooperate with the bottom of the blocking tube 70 to block the bottom opening of the drop tube 10. The arc angle arrangement of the blocking ring 74 can reduce the impact damage of the bottom opening edge of the drop tube 10 on the blocking ring 74, making it easier to retract the blocking ring 74 into the drop tube 10. The bottom of the blocking ring 74 is flush and can seal the bottom opening of the drop tube 10.

[0063] The blocking tube 70 slides up and down in the longitudinal groove using the balls 75 , which increases the directional movement of the blocking tube 70 and prevents the blocking tube 70 from colliding and damaging the flow channel 11 during the up and down sliding process.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. The method for loading and unloading a crane pipe into a tank truck is characterized in that: The following steps are involved: 1) Open the tank cover on the tank opening of the tank truck, exposing the tank opening. The vertical pipe is controlled by the loading and unloading process control system to move downward into the tank opening of the tank truck; 2) A sealing cap is arranged around the outer circumference of the vertical tube, and a spring mechanism is provided on the vertical tube. The vertical tube is connected to the sealing cap via the spring mechanism. When the vertical tube drives the sealing cap to contact the tank opening of the tank truck, the sealing cap stops moving, the vertical tube continues to move downward, and the spring mechanism tightens. 3) A limit switch is installed on the outer periphery of the vertical pipe, and the limit switch is electrically connected to the loading and unloading process control system; when the vertical pipe continues to move downward to a set distance, the sealing cap contacts the limit switch and the vertical pipe stops moving downward; 4) A sealing ring that is squeezed and deformed is installed between the spring mechanism and the sealing cap. The loading and unloading vehicle process control system controls the vertical pipe to input liquid into the tank opening. As the liquid load changes, the tank truck tilts slightly, and the sealing cap tilts with the tank opening. A gap is reserved between the spring mechanism and the vertical pipe. The sealing ring is squeezed and deformed by the tilt of the sealing cap, and the vertical pipe will not deviate from the tank opening as the tank truck tilts; 5) After loading is completed, the loading and unloading process control system controls the vertical pipe to separate from the tank mouth, and the sealing cap is reset under the extension of the spring mechanism; The vertical tube has a flow channel extending vertically therethrough, and a blocking tube that moves vertically is provided in the flow channel. The bottom of the blocking tube is closed to block the bottom opening of the flow channel. A plurality of liquid outlet holes are provided on the outer side of the bottom of the blocking tube. The top of the blocking tube is connected to the inner wall of the flow channel via a plurality of spring expansion strips. The plurality of spring expansion strips are arranged at intervals along the circumference of the top of the blocking tube. The blocking tube has a buffer channel extending vertically therethrough, and an elastically deformable buffer diaphragm is provided at the bottom of the buffer channel. The buffer diaphragm blocks the bottom opening of the blocking tube, and the flow channel is connected to the liquid outlet through the buffer channel, and the liquid outlet is connected to the outside. The bottom of the spring expansion strip is connected to the top opening of the blocking tube, and the top of the spring expansion strip is connected to the inner side wall of the flow channel. When liquid is input into the flow channel of the vertical tube, the blocking tube is impacted by the liquid flow, and the buffer diaphragm is deformed by the impact, driving the bottom of the blocking tube to move downward, the spring expansion strip extends and lengthens, and the liquid outlet is exposed outside the vertical tube; A sealing ring that is squeezed and deformed is provided on the outer side of the bottom of the sealing tube. The sealing ring is arranged circumferentially along the outer periphery of the bottom of the sealing tube. The top of the sealing ring is arranged in an arc angle from the inside to the outside, and the bottom of the sealing ring is arranged in a flat shape. The bottom of the sealing ring is arranged flush with the bottom of the sealing tube. A plurality of rolling balls are provided on the outer circumference of the blocking tube. The plurality of balls are spaced around the circumference of the blocking tube and are sequentially spaced in the longitudinal direction of the blocking tube. The balls are embedded in the outer circumference of the blocking tube. A plurality of longitudinal grooves are formed on the inner side wall of the flow channel, facing away from the blocking tube. The plurality of longitudinal grooves are spaced around the circumference of the flow channel. The balls are at least partially movably abutted in the longitudinal grooves of the flow channel. When the vertical tube is completely filled with liquid, the spring expansion strip uses its own elastic force to pull the blocking tube back into the flow channel, and the bottom of the blocking tube is arranged flush with the bottom of the vertical tube.

2. The method for loading and unloading a crane pipe into a tank truck according to claim 1, characterized in that: The spring mechanism includes a fixing ring and a pressure ring. The fixing ring is fixed around the outer circumference of the vertical tube. The fixing ring is connected to the pressure ring through a spring column. The pressure ring and the sealing ring are fixed to the sealing cap through bolts.

3. The method for loading and unloading a crane pipe into a tank truck according to claim 2, wherein: The top end surface of the sealing ring abuts the bottom of the pressure ring, and the bottom end surface of the sealing ring abuts the top of the sealing cap, and the pressure ring and the sealing cap are arranged with an upper and lower interval; the fixing ring and the pressure ring are arranged with a relative interval longitudinally, and the fixing ring is located above the pressure ring.

4. The method for loading and unloading a crane pipe into a tank truck according to claim 3, wherein: The interval between the fixing ring and the pressure ring forms a compression area for the spring column to be compressed and deformed, and a plurality of spring columns are arranged at intervals around the circumference of the extended compression area.

5. The method for loading and unloading a crane pipe into a tank truck according to claim 4, characterized in that: The limit switch and the sealing cap are arranged opposite to each other in the longitudinal direction, and the limit switch is located above the sealing cap.

6. The method for loading and unloading a crane pipe into a tank truck according to claim 5, characterized in that: The limit switch includes a switch seat and a driving rod that controls the vertical tube to stop moving downward. One end of the driving rod is hingedly mounted on the switch seat, and the switch seat is mounted on the outer periphery of the vertical tube. The other end of the driving rod is mounted with a guide wheel, and the guide wheel is exposed above the sealing cap.

7. The method for loading and unloading a crane pipe into a tank truck according to claim 6, wherein: The switch seat is mounted on the fixing ring, the sealing cap is connected with a ventilation pipe, and the ventilation pipe is longitudinally inserted into the top of the sealing cap.

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