Telescopic vertical pipe for crane pipe

Abstract

The utility model belongs to the technical field of oil transfer arms, and particularly discloses a telescopic vertical pipe for a crane pipe. Comprising a connecting flange, an inner pipe assembly, an outer pipe assembly, a compression spring and an anti-collision pad. The inner pipe assembly comprises an inner pipe baffle ring, an inner pipe anti-collision ring, an inner pipe and an inner pipe plug; the connecting flange is connected with an outer pipe assembly, the outer pipe assembly comprises an outer pipe, an outer pipe anti-collision ring and an outer pipe baffle ring, the lower end of the outer pipe is connected with the outer pipe baffle ring, one end of the outer pipe baffle ring fixes a compression spring, and the other end fixes the outer pipe anti-collision ring; an inner pipe baffle ring is welded to the upper end of the inner pipe, a compression spring is fixed to one end of the inner pipe baffle ring, an inner pipe anti-collision ring is fixed to the other end of the inner pipe baffle ring, and an inner pipe plug is welded in the inner pipe and connected with an anti-collision pad. In the practical application, the compression spring is arranged in the gap between the inner pipe and the outer pipe, so that the fluid is prevented from scouring the compression spring, the service life of the compression spring is prolonged, and the reliability of the product is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of loading arms, and specifically discloses a telescopic vertical pipe for a loading arm. Background Art

[0002] The telescopic vertical pipe of a loading arm is usually equipped with a tension spring as its main power source. Specifically, when a liquid medium is transported through the telescopic vertical pipe, the dynamic pressure of the medium together with the weight of the inner pipe itself is sufficient to overcome the restoring force of the tension spring, causing the inner pipe to displace downward until it reaches the bottom of the tank truck, thereby achieving the safe operation of submerged loading, preventing liquid splashing and suppressing static electricity generation. Once the tank truck reaches the upper limit of its loading capacity, the control valve of the loading system closes immediately, interrupting the flow of the medium in the pipeline and thus eliminating the dynamic pressure on the inner pipe. At this time, the inherent restoring force of the tension spring dominates, exceeding the influence of the static mass of the inner pipe, and causing the inner pipe to return to its initial state under the drive of the spring force, that is, the inner pipe retracts to its original position in the telescopic vertical pipe (as Figure 1 shown). However, this configuration has several limitations. In particular, the tension spring is long-term exposed to the impact of the medium, and is extremely vulnerable to permanent deformation and even fracture, significantly shortening the service life of the telescopic vertical pipe, and may cause the inner pipe to fail to reset properly or the risk of accidentally falling into the tank truck, thereby interfering with the normal loading operation process.

[0003] A vehicle-mounted loading telescopic sleeve device with the patent application number CN202020623436.7 includes an outer pipe, the inner wall of the top end of the outer pipe slidably sleeved with an inner sleeve, and an elastic device is arranged at the gap between the outer pipe and the inner sleeve; a flange for encapsulating the elastic device is fixedly sleeved at the top end of the outer pipe, and the flange is fixedly connected to the upper end of the vertical pipe through a bolt assembly. The above device does not provide an inner pipe plug, and fluid leakage or external impurities may enter the inner pipe during the non-working state, affecting the cleanliness and safety of the pipeline system. Therefore, it is urgent for those skilled in the art to solve the above technical problems. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is that in the above-mentioned prior art, impurities easily enter the inner pipe during the use of the telescopic vertical pipe of the loading arm, resulting in the phenomenon of blockage of the inner pipe.

[0005] To solve the above technical problems, the technical solution adopted by the utility model is:

[0006] A telescopic vertical pipe for a loading arm, comprising a connecting flange, an inner pipe assembly, an outer pipe assembly, a compression spring and a collision cushion; the inner pipe assembly includes an inner pipe retaining ring, an inner pipe anti-collision ring, an inner pipe and an inner pipe plug; the connecting flange connects the outer pipe assembly, the outer pipe assembly includes an outer pipe, an outer pipe anti-collision ring and an outer pipe retaining ring, the lower end of the outer pipe is connected to the outer pipe retaining ring, one end of the outer pipe retaining ring fixes the compression spring, and the other end of the outer pipe retaining ring fixes the outer pipe anti-collision ring; the inner pipe retaining ring is welded to the upper end of the inner pipe, one end of the inner pipe retaining ring fixes the compression spring, and one end fixes the inner pipe anti-collision ring, the inner pipe plug is welded in the inner pipe, and the inner pipe plug is connected to the collision cushion; the inner pipe is installed inside the outer pipe, an isolation groove is provided between the inner pipe and the outer pipe, the compression spring is installed in the installation groove, and the upper and lower ends of the compression spring are respectively installed in the isolation grooves of the inner pipe retaining ring and the outer pipe retaining ring.

[0007] Further, the inner pipe retaining ring is welded to the upper end of the outer part of the inner pipe, and two installation grooves are further provided at both ends of the inner pipe retaining ring, the installation grooves fix the compression spring, and the other installation groove installs the inner pipe anti-collision ring.

[0008] The installation groove ensures the precise positioning of the compression spring, prevents the spring from shifting or twisting during operation, thus ensuring the normal compression and recovery performance of the spring, increasing the stability and reliability of the system. The setting of the inner pipe anti-collision ring can effectively buffer the collision of the inner pipe during movement, reduce the damage caused by accidental impact, protect the inner pipe and the outer pipe from direct impact, and extend the service life of the loading arm. By fixing the compression spring and the inner pipe anti-collision ring, this design helps to prevent the inner pipe from suddenly rebounding when there is no fluid pressure, avoiding potential safety hazards caused by the rapid movement of the inner pipe, such as harm to operators or damage to equipment. The clear installation groove design makes the installation and replacement of the compression spring and the inner pipe anti-collision ring more convenient, without the need for complex tools or professional knowledge, reducing the maintenance cost and time. The setting of the inner pipe retaining ring can optimize the fluid flow path, reduce the resistance during fluid flow, make the fluid flow more smoothly in the pipeline, and improve the loading efficiency. The welding instead of simple assembly method increases the structural strength between the inner pipe retaining ring and the inner pipe, ensuring that the entire system can remain stable even under the action of high-pressure fluid and is not prone to structural deformation or damage.

[0009] Further, the inner pipe anti-collision ring is made of polytetrafluoroethylene.

[0010] Polytetrafluoroethylene (PTFE) has an extremely low coefficient of friction, which means it can provide smooth sliding performance without additional lubrication, reducing the friction between the inner tube and the outer tube during the telescoping process, contributing to improving the overall operating efficiency of the system and reducing energy consumption. PTFE is a very stable polymer that can resist the erosion of most acids, alkalis, and solvents, which makes it particularly useful in industrial environments dealing with various chemicals, ensuring the long-term durability of the anti-collision ring and the entire telescopic vertical pipe. PTFE can withstand high temperatures, enabling it to maintain its physical and chemical properties in high-temperature environments, which is an important characteristic for loading arms systems that need to operate under high-temperature conditions. Due to the chemical inertness of PTFE, it does not react with fluids or substances in the surrounding environment, reducing the potential risk of contamination, which is particularly important for handling pure or sensitive materials. The surface of PTFE is smooth and hydrophobic, not easily adsorbing dirt or deposits, which makes the anti-collision ring easy to clean after use, reducing the maintenance difficulty and cost. Combining all the above characteristics, the anti-collision ring of the inner tube made of PTFE has a long service life, reducing the replacement frequency and downtime for maintenance, and improving production efficiency and economic benefits.

[0011] Furthermore, an installation hole is provided on the inner tube plug, and the anti-collision pad is installed at the installation hole of the inner tube plug through bolts.

[0012] The bolt connection provides a firm fixing point to ensure that the anti-collision pad remains stable during the telescoping process of the inner tube and will not shift or fall off due to fluid pressure or collision. The bolt fixing method enables the anti-collision pad to be quickly disassembled when maintenance or replacement is required, reducing the maintenance time and cost while ensuring the efficient operation of the equipment. The existence of the installation hole ensures that the anti-collision pad can be accurately placed in the required position, which is crucial for ensuring its best buffering effect when the inner tube extends to the bottom of the tank truck. The position of the anti-collision pad at the front end of the inner tube can effectively absorb the impact force when the inner tube contacts the tank truck, preventing damage to the inner tube or the tank truck and protecting the safety of the operators. Through bolt connection, different specifications of anti-collision pads can be easily adjusted or replaced according to specific usage conditions to adapt to different tank truck models or special working environments. Using standard bolts and pre-set installation holes can ensure the standardization of the installation process of the anti-collision pad, which is beneficial for mass production and unified maintenance procedures, improving production efficiency and reducing production costs.

[0013] Furthermore, the outer tube anti-collision ring is made of polytetrafluoroethylene.

[0014] PTFE has an extremely low coefficient of friction, which means it can provide smooth sliding performance without additional lubricants. This helps reduce the friction between the inner tube and the outer tube, ensuring smooth movement of the inner tube during telescoping and extending the service life of the entire telescopic vertical pipe of the loading arm. PTFE is a highly corrosion-resistant material that can resist the erosion of most chemicals. In the chemical industry, during the loading and unloading of liquid petroleum products and other chemicals, using PTFE material can ensure that the anti-collision ring of the outer tube will not be corroded by the transported medium, maintaining the integrity of the system. PTFE can maintain its physical and chemical properties within a wide temperature range, making it suitable for working in high-temperature environments. For example, when loading or unloading hot oil or high-temperature liquids, the anti-collision ring of the outer tube can still maintain its performance. The chemical inertness of PTFE means that it will not react with the fluid or adsorb the components in the fluid, which reduces the accumulation of pollutants, helps keep the system clean, and reduces the maintenance frequency. Due to the hydrophobicity and non-stickiness of the PTFE surface, it is not easy to adsorb dust or residues, which makes the cleaning work simple and reduces the maintenance time and cost. Combining the above characteristics, the anti-collision ring of the outer tube prepared from PTFE has a long service life, reduces the replacement frequency, and improves the overall efficiency and economy of the system.

[0015] The utility model has the following beneficial effects:

[0016] 1. The inner tube plug is located at the end of the inner tube. Its main function is to seal the opening of the inner tube, prevent fluid leakage or external impurities from entering the inner tube during non-working conditions, and ensure the cleanliness and safety of the pipeline system. The inner tube plug is usually designed with mounting holes, which are used to install other components, such as anti-collision pads. The anti-collision pads are connected to the inner tube plug through fasteners such as bolts. In this way, when the inner tube moves, the anti-collision pads can protect the tank truck from collision damage. The inner tube plug can also help determine the correct position of the inner tube. Especially when the telescopic vertical pipe is in the fully retracted state, the inner tube plug can contact certain parts of the outer tube, restricting the movement range of the inner tube and maintaining structural stability;

[0017] 2. Replace the tension spring with a compression spring and install it in the gap between the inner and outer tubes, avoiding direct impact of the fluid on the spring, reducing the elastic fatigue and potential permanent deformation of the spring, thus greatly extending the service life of the spring, avoiding the risk of the inner tube not being able to retract normally or falling due to spring failure, and ensuring the continuity and safety of the loading operation. There is an isolation groove between the inner tube and the outer tube, which is convenient for the installation and adjustment of the compression spring, simplifies the maintenance work, and at the same time ensures the appropriate gap between the components of the system, avoiding unnecessary friction and wear;

[0018] 3. The addition of the anti-collision pad plays a buffering role when the inner pipe moves to the bottom of the tanker, avoiding hard collisions, protecting both the tanker and the front end of the telescopic vertical pipe of the loading arm, reducing the potential damage risk. The inner pipe anti-collision ring and the outer pipe anti-collision ring not only help the smooth movement of the inner pipe, but also reduce the turbulence effect during fluid flow, contribute to maintaining the stability of fluid flow, and reduce the impact of the fluid on the system components. Description of the Drawings

[0019] Figure 1 is a schematic structural diagram of the telescopic vertical pipe in the prior art.

[0020] Figure 2 is a schematic structural diagram of the present utility model.

[0021] Figure 3 is Figure 2 a partial enlarged view of part A in

[0022] Among them: 1 - connecting flange; 2 - inner pipe retaining ring; 3 - inner pipe anti-collision ring; 4 - inner pipe; 5 - compression spring; 6 - outer pipe; 7 - outer pipe anti-collision ring; 8 - outer pipe retaining ring; 9 - inner pipe plug; 10 - anti-collision pad; 11 - bolt. Detailed Embodiment

[0023] The present utility model will be further described in detail below in conjunction with the drawings and specific preferred embodiments.

[0024] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "left side", "right side", "upper part", "lower part", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. "First", "second", etc. do not represent the importance of the components, so it cannot be understood as a limitation to the present utility model. The specific dimensions adopted in this embodiment are only for illustrating the technical solution by way of example and do not limit the protection scope of the present utility model.

[0025] Referring to Figure 2 , it can be seen that a telescopic vertical pipe for a loading arm is composed of a connecting flange 1, an inner pipe retaining ring 2, an inner pipe anti-collision ring 3, an inner pipe 4, a compression spring 5, an outer pipe 6, an outer pipe anti-collision ring 7, an outer pipe retaining ring 8, an inner pipe plug 9, an anti-collision pad 10, and a bolt 11.

[0026] The connecting flange 1 is connected to the telescopic vertical pipe through the bolt 11;

[0027] The connecting flange 1 is fixed to the outer pipe 6 by welding, and an outer pipe retaining ring 8 is welded to the lower end inside the outer pipe 6;

[0028] The outer tube retaining ring 8 is designed with two mounting grooves. One end fixes the compression spring 5, and the other end fixes the outer tube anti-collision ring 7. The outer tube anti-collision ring 7 is made of polytetrafluoroethylene, which plays the roles of fixing the inner tube 4 and sliding. Its material itself has the function of self-lubrication;

[0029] At the upper end of the outside of the inner tube 4, an inner tube retaining ring 2 is welded. The inner tube retaining ring 2 is designed with two mounting grooves. One end fixes the compression spring 5, and the other end fixes the inner tube anti-collision ring 3. The inner tube anti-collision ring 3 is made of polytetrafluoroethylene, which plays the roles of fixing the inner tube 4 and sliding. Its material itself has the function of self-lubrication;

[0030] An inner tube plug 9 is welded to the inner tube 4. The inner tube plug 9 is designed with a mounting hole. The anti-collision pad 10 is installed at the mounting hole of the inner tube plug 9 through the bolt 11, which plays the role of anti-collision;

[0031] The inner tube 4 is installed inside the outer tube 6, and there is a certain gap between the two. Inside the gap, a compression spring 5 is installed. The upper and lower ends of the compression spring 5 are respectively installed in the grooves of the inner tube retaining ring 2 and the outer tube retaining ring 8. After the compression spring 5 is installed into the gap and compressed, it will generate a certain spring force. The spring force is greater than the weight of the inner tube. Without the action of fluid impact force, the inner tube 4 can be completely received inside the outer tube 6.

[0032] In one embodiment, the outer tube retaining ring 8 is welded to the lower end inside the outer tube 6 to ensure its firmness and correct positioning. One end of the compression spring 5 is installed in the reserved mounting groove on one side of the outer tube retaining ring 8. The outer tube anti-collision ring 7 is installed on the other side opposite to the compression spring 5, and is also fixed by using the mounting groove of the outer tube retaining ring 8. The inner tube retaining ring 2 is welded to the upper end of the outside of the inner tube 4 to ensure that the welding surface is flat and firm. The inner tube anti-collision ring 3 is installed in the reserved mounting groove on one side of the inner tube retaining ring 2. The other end of the compression spring 5 is fixed in another reserved mounting groove of the inner tube retaining ring 2. The inner tube plug 9 is welded to the end of the inner tube 4 to ensure that the mounting holes on the plug are aligned. The compression spring 5 is placed in the gap between the inner tube retaining ring 2 and the outer tube retaining ring 8 to ensure that the two ends of the spring are respectively aligned with the grooves of the two retaining rings. The assembled inner tube assembly is carefully inserted into the outer tube 6 to ensure that there is enough gap between the inner tube 4 and the outer tube 6 to accommodate the compression spring 5. The connecting flange 1 is fixed to the top of the outer tube 6 by welding to ensure firm and flat welding. The connecting flange 1 is connected to the top of the telescopic vertical tube by using the bolts 11 to ensure that all the bolts 11 are evenly tightened. The anti-collision pad 10 is installed on the reserved mounting hole of the inner tube plug 9 through the bolts 11 to ensure that the anti-collision pad is firm and will not move easily. After the installation is completed, a function test is carried out to confirm that the compression spring 5 can work normally, the inner tube 4 can move up and down smoothly inside the outer tube 6, and at the same time the anti-collision pad 10 can effectively prevent collision.

[0033] Refer to Figure 3, it can be seen that the inner pipe plug 9 is installed at the end of the inner pipe 6 of the telescopic vertical pipe of the loading arm. Specifically, it is located at the lowermost end of the inner pipe 6 and is usually the part closest to the bottom of the tank truck when the inner pipe 6 is fully extended. In the structure of the telescopic vertical pipe, the inner pipe 6 can move up and down relative to the outer pipe, and the inner pipe plug 9 is fixed at this movable end of the inner pipe 6;

[0034] The design of the inner pipe plug 9 usually includes one or more mounting holes for fixing the anti-collision pad 10 or other accessories. During installation, the inner pipe plug 9 is pre-welded or otherwise fixed to the end of the inner pipe 6. When it is necessary to install the anti-collision pad 10, bolts 11 or other fasteners can pass through the mounting holes on the inner pipe plug to fix the anti-collision pad 10 in place.

[0035] In one embodiment, the inner pipe plug 9 needs to be designed in a shape matching the end of the inner pipe 6, usually cylindrical or other geometric shapes that match the cross-section of the inner pipe. In terms of material selection, it is usually made of metal, such as stainless steel or aluminum alloy, to ensure sufficient strength and corrosion resistance. The inner pipe plug 9 is fixed to the end of the inner pipe 6 by welding. Before welding, the contact surfaces of the inner pipe 6 and the inner pipe plug 9 need to be properly surface-treated to remove oil stains and oxide layers to ensure the welding quality and tightness. During welding, suitable welding techniques and parameters are used to ensure the strength and airtightness of the weld. One or more mounting holes are machined on the inner pipe plug 9 for fixing the anti-collision pad 10. These holes are usually threaded holes so that bolts 11 or screws can be used to install the anti-collision pad 10 on the inner pipe plug 9. The diameter and position of the mounting holes need to be precisely designed to ensure the correct installation and stability of the anti-collision pad 10. A suitable anti-collision pad 10 is selected, usually made of polytetrafluoroethylene (PTFE) or other materials with self-lubricating and wear-resistant properties. According to the mounting holes on the inner pipe plug 9, bolts 11 (or bolts of other sizes depending on the actual design) are used to fix the anti-collision pad 10 to the front end of the inner pipe plug 9. Ensure that the anti-collision pad 10 is firmly installed and will not loosen or fall off during use.

[0036] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations all fall within the protection scope of the present invention.

Claims

1. A telescopic drop pipe for a crane pipe, characterized in that: It comprises a connecting flange, an inner tube assembly, an outer tube assembly, a compression spring and an anti-collision pad; the inner tube assembly comprises an inner tube retaining ring, an inner tube anti-collision ring, an inner tube and an inner tube plug; the connecting flange is connected to the outer tube assembly, the outer tube assembly comprises an outer tube, an outer tube anti-collision ring and an outer tube retaining ring, the lower end of the outer tube is connected to the outer tube retaining ring, one end of the outer tube retaining ring fixes the compression spring, and the other end of the outer tube retaining ring fixes the outer tube anti-collision ring; the inner tube retaining ring is welded to the upper end of the inner tube, one end of the inner tube retaining ring fixes the compression spring and the other end fixes the inner tube anti-collision ring, the inner tube plug is welded in the inner tube, and the inner tube plug is connected to the anti-collision pad; the inner tube is installed inside the outer tube, an isolation groove is provided between the inner tube and the outer tube, the compression spring is installed in the installation groove, and the upper and lower ends of the compression spring are respectively installed in the isolation grooves of the inner tube retaining ring and the outer tube retaining ring.

2. A telescopic drop pipe for a crane pipe according to claim 1, characterized in that: The inner tube retaining ring is welded to the outer upper end of the inner tube, and two installation grooves are provided at both ends of the inner tube retaining ring. The compression spring is fixed in the installation groove, and the inner tube anti-collision ring is installed in the other installation groove.

3. The telescopic drop pipe for a crane pipe according to claim 1, characterized in that: The inner tube anti-collision ring is made of polytetrafluoroethylene.

4. The telescopic drop pipe for a crane pipe according to claim 1, characterized in that: The inner tube plug is provided with a mounting hole, and the anti-collision pad is mounted at the mounting hole of the inner tube plug by means of bolts.

5. The telescopic drop pipe for a crane pipe according to claim 1, characterized in that: The outer tube anti-collision ring is made of polytetrafluoroethylene.

Images