A telescoping drop device and method for use on a trestle loading boom

Abstract

The present application relates to the technical field of machinery and fluid delivery, and particularly relates to a telescopic vertical pipe device and method used on a trestle loading crane pipe. The device comprises a vertical pipe outer pipe, the bottom end of the vertical pipe outer pipe is a lower end guide ring, the top end of the lower end guide ring is provided with a lower anti-collision ring, the inside of the vertical pipe outer pipe is provided with a vertical pipe telescopic inner pipe, the outside of the vertical pipe telescopic inner pipe is provided with a compression spring, the upper end of the vertical pipe telescopic inner pipe is an upper end guide ring, the bottom end of the upper end guide ring is provided with an upper anti-collision ring, the outside of the lower end of the vertical pipe telescopic inner pipe is provided with a plurality of liquid outlet holes, the bottom end of the vertical pipe telescopic inner pipe is a liquid inlet thrust disc, the liquid inlet thrust disc is provided with a blast-proof limiter, and the outside of the vertical pipe outer pipe is provided with a plurality of auxiliary handles. The telescopic vertical pipe device and method used on the trestle loading crane pipe provided by the present application not only effectively prolongs the service life of the compression spring, but also reduces the operation difficulty and further improves the work efficiency.

Description

Technical Field

[0001] This invention relates to the field of mechanical and fluid transport technology, and in particular to a retractable vertical pipe device and method for use on loading arms of trestle trucks. Background Technology

[0002] Currently, all railway trestle loading methods involve top-opening loading, which must comply with industry standards stipulating that "loading arms should be inserted 200mm from the bottom of the tank" and "loading arms should be inserted no more than 0.2m from the bottom of the tank car." Existing railway trestle loading arms do not meet these standards. Based on the actual site conditions, directly lengthening the trestle loading arms' vertical pipes would restrict the operating area due to the trestle roof, lifelines, and safety beams, preventing the arms from entering the tank car opening for loading operations. Furthermore, the fixed-length loading arms' vertical pipes cannot meet the requirements of all vehicle types during loading operations, with a distance difference exceeding 200mm. Redesigning the trestle, raising the roof and columns, and modifying related lifelines, safety beams, and other facilities would be a large-scale and time-consuming project, making loading operations impossible during the modification period, impacting production, and failing to meet the standards. Therefore, it is necessary to modify the existing trestle loading arms' vertical pipes.

[0003] At present, the common railway trestle oil loading arms are mainly composed of five parts: balancing device, rotary joint, inner arm, outer arm and vertical pipe. The vertical pipe is mainly inserted into the tank car when loading oil into the tank car.

[0004] CN 202829564 U discloses a train submersible loading arm expansion joint, the main components of which include: an expansion tube installed in the lower part of the loading arm, a tension spring installed in the expansion tube, one end of the tension spring connected to a tension spring adjuster, the adjuster connected to a guide head, the guide head connected to a rubber plate, the other end of the tension spring connected to a tension spring connector, the connector having a shaft pin, and a horizontal shaft passing through the tension spring connector and the upper part of the loading arm. The disadvantage is that the spring is easily deformed.

[0005] CN 103130172 A discloses a telescopic vertical tube for loading arms, including an outer tube fixedly installed at the liquid outlet of the loading arm body, an inner tube with a closed bottom end movably inserted inside the outer tube, an upper sealing ring provided on the upper part of the outer wall of the inner tube, an end guide ring and a lower sealing ring provided at the bottom end of the inner wall of the outer tube, several guide rings provided on the outer wall of the inner tube, a liquid outlet hole provided on the inner tube wall near the bottom end, an anti-collision pad made of elastic material provided at the bottom of the inner tube, a fixing frame provided at the liquid outlet of the loading arm body, a tension spring provided on the fixing frame, the other end of the tension spring being connected to the bottom end of the inner tube, and the tension of the tension spring being greater than the weight of the inner tube. Its beneficial effects are as follows: the free extension and retraction of the loading arm's vertical tube is achieved through the tension spring device. During loading, the liquid flows into the inner tube, and the inner tube is pushed out by gravity and impact force to overcome the tension of the tension spring. The liquid flows into the vehicle from the liquid outlet. After loading is completed, the valve is closed, and the liquid flows out from the lower end of the inner tube. The tension spring overcomes the gravity of the inner tube and pulls the inner tube back into the outer tube, thereby realizing automatic liquid loading.

[0006] CN 219044840 U discloses a telescopic loading arm structure, including a fixed tube, a movable tube, and a telescopic mechanism. The fixed tube and the movable tube are movably connected. A connecting tube extending into the interior of the fixed tube is fixedly installed on the side of the movable tube near the fixed tube. The telescopic mechanism includes a fixed box fixedly installed at the top and bottom of the outer surface of the fixed tube. A cylinder with one end penetrating and extending to the outside of the fixed box is fixedly installed inside the fixed box. A fixed ring is fixedly installed on the left side of the outer surface of the movable tube. The output shaft of the cylinder is fixedly connected to the fixed ring. This telescopic loading arm structure, by setting the telescopic mechanism, allows the connecting tube to extend or retract by activating the cylinder to push the movable tube via the fixed ring. A locking block minimizes the displacement of the connecting tube, sealant enhances the sealing at the connection between the connecting tube and the fixed tube, and a limiting block and a limiting rod minimize the shaking of the movable tube, thus enhancing the overall structural stability.

[0007] The aforementioned structure uses a tension spring to extend the loading arm's vertical tube. However, this design has two drawbacks: first, the spring is prone to deformation if it exceeds its limit; second, the tension spring is located inside the vertical tube, and during oil loading, it is immersed in the oil. If impurities are present in the oil, they can easily become entangled in the spring, restricting its elasticity and hindering the loading process. Furthermore, after loading, the inner tube may not retract, affecting the loading operation. The previous structure used a pneumatic device to extend and retract the vertical tube, but this requires a higher overall investment. Adopting this device necessitates a redesign of the loading platform and the addition of an air supply. Additionally, the structure is complex and maintenance is cumbersome. Therefore, to address these shortcomings, a retractable vertical tube device and method for loading arms on loading platforms are proposed. Summary of the Invention

[0008] (a) Technical problems to be solved This invention provides a retractable vertical tube device and method for use on loading arms on trestle bridges, to overcome the problems in the prior art where the springs of retractable vertical tube devices are easily corroded, worn, and deformed, and debris hangs on the springs, causing spring deformation that affects oil loading operations, and the inner tube of the loading arm is easily unable to retract after the oil loading operation is completed, thus affecting the loading operation.

[0009] (II) Technical Solution To address the above problems, the present invention provides a retractable vertical pipe device for use on loading arms of trestle bridges, comprising: The outer tube of the vertical tube has a lower guide ring at its bottom end and a lower anti-collision ring installed at the top of the lower guide ring. An inner telescopic tube is installed inside the outer tube, and a compression spring is sleeved on the outside of the inner telescopic tube. The inner telescopic tube is controlled to extend and retract by the compression spring and can extend beyond the outer tube. An upper guide ring is located at the top end of the inner telescopic tube, and an anti-collision ring is installed at the bottom of the upper guide ring. Multiple liquid outlet holes are provided on the outer side of the lower end of the inner telescopic tube. An inlet thrust plate is located at the bottom end of the inner telescopic tube, and the inlet thrust plate is connected to an explosion-proof limiter. Multiple auxiliary handles are provided on the outer side of the outer tube.

[0010] Preferably, the outer tube of the vertical tube is connected to the loading arm body, and the top end of the inner part of the outer tube is detachably connected to an adjusting length mechanism. The adjusting length mechanism is connected to the telescopic inner tube of the vertical tube, and the telescopic inner tube of the vertical tube controls the telescopic length through the adjusting length mechanism.

[0011] Preferably, the length adjustment mechanism includes a fixed horizontal shaft, an adjustable wire rope fixing device, a limiting wire rope, and a lower wire rope fixing device. The interior of the outer tube of the vertical tube is a hollow tube. The top of the interior of the outer tube is fitted with a fixed horizontal shaft via an end flange. The interior of the outer tube is fitted with an adjustable wire rope fixing device via the fixed horizontal shaft. The adjustable wire rope fixing device is connected to the first end of the limiting wire rope, and the tail end of the limiting wire rope is connected to the lower wire rope fixing device.

[0012] Preferably, a magnetic ring is installed at the bottom end of the upper anti-collision ring, a magnetic ring is installed at the top end of the lower anti-collision ring, and a magnetic ring is installed at the top end of the fixed horizontal shaft.

[0013] Preferably, the interior of the telescopic inner tube is a hollow tube, the lower end steel wire rope fixing device is installed at the bottom end of the telescopic inner tube, and the length of the limiting steel wire rope can be lowered to the bottom of the telescopic inner tube.

[0014] Preferably, the loading arm body is connected to the vertical pipe outer tube via a connecting flange, and the loading arm body and the vertical pipe outer tube are sealed by a sealing ring, with a magnetic ring connected to the bottom of the sealing ring.

[0015] Preferably, a lower end guide ring is fixedly connected to the lower end of the inner wall of the outer tube of the vertical tube, and an upper end guide ring is fixedly connected to the outer wall of the upper end of the telescopic inner tube of the vertical tube.

[0016] Preferably, the inner diameter of the outer tube of the vertical tube is larger than the outer diameter of the inner tube of the vertical tube telescopic system.

[0017] Preferably, the liquid inlet thrust plate and the vertical tube telescopic inner tube are an integrated structure, the liquid inlet thrust plate is the bottom surface of the vertical tube telescopic inner tube, and the liquid inlet thrust plate is recessed inward.

[0018] Preferably, the explosion-proof limiter includes a limit block and a connecting bolt. The limit block is connected to the connecting bolt, the connecting bolt passes through the liquid inlet thrust plate, and the limit block is fastened to the liquid inlet thrust plate. The limit block is located outside the liquid inlet thrust plate, and the connecting bolt is located inside the liquid inlet thrust plate.

[0019] The present invention also provides a method based on a retractable vertical pipe device used on a loading arm of a trestle, comprising: Depending on the operational requirements, an adjusting length mechanism may or may not be installed inside the outer tube of the vertical pipe. If an adjusting length mechanism is installed inside the outer tube, it is connected to the telescopic inner tube. When not in operation, the telescopic inner tube is retracted inside the outer tube. During oil loading, as the amount of oil in the telescopic inner tube increases, the inner tube compresses the compression spring under gravity, causing it to extend from the outer tube, and crude oil flows out from the outlet. After oil loading, the amount of crude oil in the telescopic inner tube decreases, reducing the pressure on the compression spring. The compression spring then overcomes gravity and pulls the inner tube back into the outer tube.

[0020] (III) Beneficial Effects The retractable vertical tube device and method for loading arms on trestle bridges provided by this invention reduce the ultimate deformation of compression springs, further extend the service life of compression springs, and make spring replacement and maintenance more convenient, thereby reducing the maintenance cost of the entire device. At the same time, by applying this device in actual oil loading operations, it can not only effectively reduce the operational difficulty of oil loading operations, but also improve work efficiency. In addition, this device can reduce safety risks during operation to a certain extent. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the retractable vertical pipe device of the present invention used on the loading arm of a trestle. Figure 2 This is a schematic diagram of the retractable vertical pipe device without an adjustable length mechanism used on the loading arm of a trestle in accordance with the present invention.

[0022] Legend: 1-Loading arm body; 2-Connecting flange; 3-End flange; 4-Sealing ring; 5-Outer tube of vertical pipe; 6-Upper end guide ring; 7-Upper anti-collision ring; 8-Compression spring; 9-Inner tube of vertical pipe telescopic movement; 10-Lower end guide ring; 11-Discharge hole; 12-Inlet thrust plate; 13-Explosion-proof limiter; 14-Auxiliary handle; 15-Lower anti-collision ring; 16-Magnetic ring; 17-Fixed horizontal shaft; 18-Adjustable wire rope fixing device; 19-Limiting wire rope; 20-Lower end wire rope fixing device. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] In the description of this invention, it is necessary to understand that the orientation or positional relationship indicated by terms such as "upper", "lower", "inner", "outer", "top", and "bottom" are based on the orientation or positional relationship shown in the accompanying drawings. The purpose is only to facilitate the description of this invention and to simplify the description. It is not intended to indicate or imply that the component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0025] Figure 1 This is a schematic diagram of the retractable vertical pipe device used on the loading arm of a trestle bridge according to the present invention. Figure 2 This is a schematic diagram of the retractable vertical pipe device without an adjustable length mechanism used on the loading arm of a trestle, as described in the present invention. Figures 1-2 As shown, the present invention provides a retractable vertical pipe device for use on loading arms of trestle bridges, specifically comprising: The outer tube 5 of the vertical tube has a lower end guide ring 10 at its bottom end and a lower anti-collision ring 15 installed at the top end of the lower guide ring 10. The inner tube 9 of the vertical tube is installed inside the outer tube 5. A compression spring 8 is sleeved on the outside of the inner tube 9. The inner tube 9 is controlled to extend and retract by the compression spring 8 and can extend out of the outer tube 5. The upper end of the inner tube 9 has an upper end guide ring 6 and an anti-collision ring 7 is installed at the bottom of the upper end guide ring 6. The outer side of the lower end of the inner tube 9 is provided with multiple liquid outlet holes 11. The bottom end of the inner tube 9 is a liquid inlet thrust plate 12. The liquid inlet thrust plate 12 is connected through an explosion-proof limiter 13. The outer side of the outer tube 5 is provided with multiple auxiliary handles 14.

[0026] In this device, the outer tube 5 of the vertical tube is connected to the loading arm body 1. The top end of the inner part of the outer tube 5 is detachably connected to the length adjustment mechanism. The length adjustment mechanism is connected to the telescopic inner tube 9 of the vertical tube. The telescopic inner tube 9 of the vertical tube controls the telescopic length through the length adjustment mechanism.

[0027] In practical applications, the length adjustment mechanism includes a fixed horizontal shaft 17, an adjustable wire rope fixing device 18, a limiting wire rope 19, and a lower wire rope fixing device 20. The interior of the outer tube 5 of the vertical tube is a hollow tube. The top end of the interior of the outer tube 5 is fitted with the fixed horizontal shaft 17 via an end flange 3. The interior of the outer tube 5 is fitted with the adjustable wire rope fixing device 18 via the fixed horizontal shaft 17. The adjustable wire rope fixing device 18 is connected to the first end of the limiting wire rope 19, and the tail end of the limiting wire rope 19 is connected to the lower wire rope fixing device 20.

[0028] It should be noted that a magnetic ring 16 is installed at the bottom of the upper anti-collision ring 7, a magnetic ring 16 is installed at the top of the lower anti-collision ring 15, and a magnetic ring is installed at the top of the fixed horizontal axis 17.

[0029] In this device, the interior of the vertical tube telescopic inner tube 9 is a hollow tube, and the lower end steel wire rope fixing device 20 is installed at the bottom end of the vertical tube telescopic inner tube 9. The length of the limiting steel wire rope 19 can be lowered to the bottom of the vertical tube telescopic inner tube 9.

[0030] In practical applications, the loading arm body 1 is provided with a liquid outlet. The loading arm body 1 is installed with the vertical pipe outer tube 5 through the liquid outlet. The loading arm body 1 is connected to the vertical pipe outer tube 5 through the connecting flange 2. The loading arm body 1 and the vertical pipe outer tube 5 are sealed by a sealing ring 4. The bottom of the sealing ring 4 is connected to a magnetic ring 16.

[0031] In this device, the lower end of the inner wall of the outer tube 5 is fixedly connected to the lower end guide ring 10, and the upper end of the outer wall of the telescopic inner tube 9 is fixedly connected to the upper end guide ring 6. This can also be understood as the outer tube 5 and the lower end guide ring 10 being an integrated structure, and the telescopic inner tube 9 and the upper end guide ring 6 being an integrated structure. Furthermore, it should be noted that the inner diameter of the outer tube 5 is larger than the outer diameter of the telescopic inner tube 9.

[0032] In practical applications, the liquid inlet thrust plate 12 and the vertical tube telescopic inner tube 9 are integrated structures. The liquid inlet thrust plate 12 is the bottom surface of the vertical tube telescopic inner tube 9, and the liquid inlet thrust plate 12 is recessed inward.

[0033] In this device, the explosion-proof limiter 13 includes a limit block and a connecting bolt. The limit block is connected to the connecting bolt, which passes through the liquid inlet thrust plate 12. The limit block is fastened to the liquid inlet thrust plate 12. The outside of the liquid inlet thrust plate 12 is the limit block, and the inside of the liquid inlet thrust plate 12 is the connecting bolt.

[0034] In practical applications, it should be noted that the lower wire rope fixing device 20 is shaped like an inverted bowl, the bottom of the lower wire rope fixing device 20 is the liquid inlet thrust plate 12, and the lower wire rope fixing device 20 fastens the connecting bolt of the explosion-proof limiter 13.

[0035] In this device, the vertical tube assembly of the loading arm 1 is designed as a double-layered tube structure. The outer vertical tube 5 is fixed and serves as support and protection; the inner vertical tube 9 can extend and retract freely, responsible for transporting crude oil. In practical applications, by setting a liquid outlet hole 11 on the wall of the inner vertical tube 9 near the bottom, smooth flow of crude oil is achieved.

[0036] In practical applications, to balance the force on the inner tube of the vertical tube during its extension and retraction, a compression spring 8 is installed on the outer ring of the inner tube 9. This ensures that the elasticity of the compression spring 8 is not affected by external forces and effectively prevents it from being corroded and worn. It also makes the replacement and maintenance of the compression spring 8 more convenient, reducing the overall maintenance cost of the device.

[0037] In addition, in this device, an auxiliary handle 14 is provided on the outside of the vertical tube 5. The auxiliary handle 14 is used to move the entire loading arm. The auxiliary handle 14 is easy to hold and operate, which can not only effectively reduce the difficulty of operation and improve work efficiency, but also reduce the safety risks in the operation process to a certain extent.

[0038] The present invention also provides a method based on a retractable vertical pipe device used on a loading arm of a trestle, comprising: Depending on the operational requirements, an adjusting length mechanism may or may not be installed inside the outer tube 5 of the vertical pipe. If an adjusting length mechanism is installed inside the outer tube, it is connected to the telescopic inner tube 9. When not in operation, the telescopic inner tube 9 is retracted inside the outer tube 5. During oil loading, as the amount of oil in the telescopic inner tube 9 increases, the inner tube 9 compresses the compression spring 8 under the action of gravity, causing it to extend out from inside the outer tube 5, and crude oil flows out from the outlet hole 11. After oil loading, the amount of crude oil in the telescopic inner tube 9 decreases, reducing the pressure on the compression spring 8. The compression spring 8 then overcomes gravity and pulls the inner tube 9 back into the outer tube 5.

[0039] In this method, utilizing the principle of gravity, the vertical tube assembly of the loading arm body 1 is designed as a telescopic inner and outer tube sleeve. The outer tube 5 contains a movable, bottom-closed telescopic inner tube 9. A compression spring 8 is mounted on the outer ring of the telescopic inner tube 9. An outlet hole 11 is located near the bottom of the inner tube wall. When not in operation, the telescopic inner tube 9 is retracted within the outer tube 5. During oil loading, as the amount of oil in the telescopic inner tube 9 increases, gravity compresses the compression spring 8, causing the inner tube 9 to extend. Crude oil flows into the vehicle through the outlet hole 11. After oil loading, the amount of crude oil in the telescopic inner tube 9 decreases, reducing the pressure on the compression spring 8. The compression spring 8 overcomes the gravity of the telescopic inner tube 9, pulling it back into the outer tube 5. The length adjustment mechanism limits the extension and retraction length of the inner tube 9 of the vertical tube telescopic system, reduces the limit deformation of the compression spring 8, and extends its service life. The magnetic ring 16 is used to reduce vibration.

[0040] This invention provides a retractable vertical pipe device and method for use on loading arms on trestles, effectively extending the service life of the compression spring, further reducing operational difficulty, and improving work efficiency. The working principle of this retractable vertical pipe device and method for use on loading arms on trestles is described below: In this embodiment, as Figure 2 As shown, when the inner part of the outer tube 5 of the vertical tube is not equipped with an adjustment length mechanism, the loading arm body 1 is connected to the outer tube 5 through the liquid outlet. The lower end of the outer tube 5 is integrally connected with the lower end guide ring 10. The top of the lower end guide ring 10 is equipped with a lower anti-collision ring 15. The inner tube 9 of the vertical tube is movably connected inside the outer tube 5. The inner tube 9 of the vertical tube is a straight pipe section. The upper part of the inner tube 9 of the vertical tube is integrally connected with the upper end guide ring 6. The bottom of the inner tube 9 of the vertical tube is provided with a liquid outlet hole 11. The upper end guide ring 6 is equipped with an upper anti-collision ring 7. The lower end side of the inner tube 9 of the vertical tube is provided with a liquid outlet hole 11. The bottom end of the inner tube 9 of the vertical tube is a fully enclosed liquid inlet thrust plate 12. An explosion-proof limiter 13 is installed on the liquid inlet thrust plate 12.

[0041] In practical applications, the outer tube 5 of the vertical pipe is fixed to the loading arm body 1 by the connecting flange 2. The outer tube 5 of the vertical pipe and the loading arm body 1 are sealed by the sealing ring 4. The compression spring 8 surrounds the inner tube 9 of the vertical pipe and is located in the middle of the interlayer between the outer tube 5 and the inner tube 9 of the vertical pipe. During operation, it is located in the gap between the inner and outer tubes.

[0042] In this embodiment, an auxiliary handle 14 is added to the outer tube 5 of the vertical tube, so that the operator can hold and operate it more conveniently during installation and disassembly.

[0043] In this embodiment, as Figure 1As shown, when the length adjustment mechanism is installed inside the outer tube 5 of the vertical pipe, the loading arm body 1 is connected to the outer tube 5 through the outlet, the auxiliary handle 14 is installed on the outside of the outer tube 5, the outer tube 5 is fixed to the loading arm body 1 through the connecting flange 2, the length adjustment mechanism is installed inside the outer tube 5, the lower end of the outer tube 5 is integrally connected to the lower end guide ring 10, the top of the lower end guide ring 10 is installed with the lower anti-collision ring 15, the inner tube 9 of the vertical pipe is movably connected inside the outer tube 5, and the outer tube 5 and the vertical pipe A compression spring 8 is installed between the telescopic inner tubes 9. The length adjustment mechanism is connected to the vertical telescopic inner tube 9. The vertical telescopic inner tube 9 is a straight pipe section. The upper part of the vertical telescopic inner tube 9 is integrated with the upper end guide ring 6. The bottom of the vertical telescopic inner tube 9 is provided with a liquid outlet hole 11. An anti-collision ring 7 is installed at the bottom of the upper end guide ring 6. The lower end side of the vertical telescopic inner tube 9 is provided with a liquid outlet hole 11. The bottom end of the vertical telescopic inner tube 9 is a fully enclosed liquid inlet thrust plate 12. An explosion-proof limiter 13 is installed on the liquid inlet thrust plate 12.

[0044] In practical applications, the length adjustment mechanism is used to limit the extension length of the inner tube. The length adjustment mechanism consists of a fixed horizontal shaft 17, an adjustable wire rope fixing device 18, a limiting wire rope 19, and a lower wire rope fixing device 20. The outer tube 5 of the vertical tube is connected to the fixed horizontal shaft 17 through the end flange 3. One end of the fixed horizontal shaft 17 is connected to the adjustable wire rope fixing device 18, which is connected to the limiting wire rope 19. The other end of the limiting wire rope 19 is fixed to the lower wire rope fixing device 20, which is fixedly connected to the liquid inlet thrust plate 12.

[0045] In this embodiment, the elastic force of the compression spring 8 is used to realize the free extension and retraction of the inner tube 9 of the vertical tube telescopic tube, and the maximum extension length of the inner tube 9 of the vertical tube telescopic tube is adjusted. Since the compression spring 8 is located in the gap between the inner and outer tubes, it also effectively solves the problem of the compression spring 8 being in contact with oil, causing corrosion, wear restriction and elasticity exceeding the restricted space of the compression spring 8.

[0046] In practical applications, when the inner tube 9 of the vertical pipe extends and retracts within the outer tube 5 of the vertical pipe, the interaction between the magnetic rings 16—that is, the lower parts repel each other and the upper parts attract each other—effectively reduces the jamming and shaking phenomenon of the inner tube 9 during the extension and retraction process, further ensuring the stability and continuity of crude oil transportation.

[0047] In this embodiment, during the oil loading operation, as the amount of oil in the inner telescopic tube 9 increases, the inner telescopic tube 9 compresses the compression spring 8 under the action of gravity, causing the inner telescopic tube 9 to extend. Crude oil flows into the vehicle from the outlet hole 11. Due to the restriction of the limiting steel wire rope 19, the compression limit of the compression spring 8 is protected. After the oil loading operation, the amount of crude oil in the inner telescopic tube 9 decreases, and the pressure on the compression spring 8 decreases. The compression spring 8 overcomes the gravity of the inner telescopic tube 9 and pulls the inner telescopic tube 9 back into the outer telescopic tube 5, where the inner telescopic tube 9 retracts into the outer telescopic tube 5.

[0048] The retractable vertical tube device and method for loading arms on trestle bridges provided by this invention reduce the ultimate deformation of compression springs, further extend the service life of compression springs, and make spring replacement and maintenance more convenient, thereby reducing the maintenance cost of the entire device. At the same time, by applying this device in actual oil loading operations, it can not only effectively reduce the operational difficulty of oil loading operations, but also improve work efficiency. In addition, this device can reduce safety risks during operation to a certain extent.

[0049] The above embodiments are only used to illustrate the present invention and are not intended to limit the present invention. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also fall within the scope of the present invention, and the patent protection scope of the present invention should be defined by the claims.

Claims

1. A retractable vertical pipe device for use on loading arms of trestle bridges, characterized in that, include: The outer tube of the vertical tube (5) has a lower end guide ring (10) at its bottom end and a lower anti-collision ring (15) installed at the top of the lower guide ring (10). The inner tube of the vertical tube (5) is installed inside the outer tube of the vertical tube (5). A compression spring (8) is sleeved on the outside of the inner tube of the vertical tube (9). The inner tube of the vertical tube (9) is controlled to extend and retract by the compression spring (8). The inner tube of the vertical tube (9) can extend out of the outer tube of the vertical tube (5). The upper end of the inner tube of the vertical tube (9) has an upper end guide ring (6). An anti-collision ring (7) is installed at the bottom of the upper end guide ring (6). Multiple liquid outlet holes (11) are provided on the outer side of the lower end of the inner tube of the vertical tube (9). The bottom end of the inner tube of the vertical tube (9) is a liquid inlet thrust plate (12). The liquid inlet thrust plate (12) is connected through an explosion-proof limiter (13). Multiple auxiliary handles (14) are provided on the outer side of the outer tube of the vertical tube (5).

2. The retractable vertical pipe device for use on loading arms of trestle bridges according to claim 1, characterized in that, The outer tube (5) of the vertical tube is connected to the loading arm body (1). The top end of the inner part of the outer tube (5) of the vertical tube is detachably connected to the length adjustment mechanism. The length adjustment mechanism is connected to the telescopic inner tube (9) of the vertical tube. The telescopic inner tube (9) of the vertical tube controls the telescopic length through the length adjustment mechanism.

3. The retractable vertical pipe device for loading arms on trestle bridges according to claim 2, characterized in that, The length adjustment mechanism includes a fixed horizontal shaft (17), an adjustable wire rope fixing device (18), a limiting wire rope (19), and a lower wire rope fixing device (20). The interior of the vertical tube outer pipe (5) is a hollow tube. The top end of the interior of the vertical tube outer pipe (5) is fitted with a fixed horizontal shaft (17) via an end flange (3). The interior of the vertical tube outer pipe (5) is fitted with an adjustable wire rope fixing device (18) via the fixed horizontal shaft (17). The adjustable wire rope fixing device (18) is connected to the first end of the limiting wire rope (19), and the tail end of the limiting wire rope (19) is connected to the lower wire rope fixing device (20).

4. The retractable vertical pipe device for loading arms on trestle bridges according to claim 3, characterized in that, A magnetic ring (16) is installed at the bottom of the upper anti-collision ring (7), a magnetic ring (16) is installed at the top of the lower anti-collision ring (15), and a magnetic ring (16) is installed at the top of the fixed horizontal shaft (17).

5. The retractable vertical pipe device for use on loading arms of trestle bridges according to claim 3, characterized in that, The interior of the telescopic inner tube (9) is a hollow tube. The lower end wire rope fixing device (20) is installed at the bottom of the telescopic inner tube (9). The length of the limiting wire rope (19) can be lowered to the bottom of the telescopic inner tube (9).

6. The retractable vertical pipe device for use on loading arms of trestle bridges according to claim 2 or 4, characterized in that, The loading arm body (1) is connected to the vertical pipe outer tube (5) through the connecting flange (2). The loading arm body (1) and the vertical pipe outer tube (5) are sealed by a sealing ring (4). A magnetic ring (16) is connected to the bottom of the sealing ring (4).

7. The retractable vertical pipe device for use on loading arms of trestle bridges according to claim 1, characterized in that, The lower end of the inner wall of the outer tube (5) of the vertical tube is fixedly connected to the lower end guide ring (10), and the upper end of the outer wall of the telescopic inner tube (9) of the vertical tube is fixedly connected to the upper end guide ring (6).

8. The retractable vertical pipe device for use on loading arms of trestle bridges according to claim 7, characterized in that, The inner diameter of the outer tube (5) of the vertical tube is larger than the outer diameter of the telescopic inner tube (9) of the vertical tube.

9. The retractable vertical pipe device for use on loading arms of trestle bridges according to claim 1, characterized in that, The inlet thrust plate (12) and the vertical tube telescopic inner tube (9) are an integrated structure. The inlet thrust plate (12) is the bottom surface of the vertical tube telescopic inner tube (9), and the inlet thrust plate (12) is recessed inward.

10. The retractable vertical pipe device for use on loading arms of a trestle bridge according to claim 9, characterized in that, The explosion-proof limiter (13) includes a limit block and a connecting bolt. The limit block is connected to the connecting bolt. The connecting bolt passes through the liquid inlet thrust plate (12). The limit block is fastened to the liquid inlet thrust plate (12). The outside of the liquid inlet thrust plate (12) is the limit block, and the inside of the liquid inlet thrust plate (12) is the connecting bolt.

11. A method for using a retractable vertical pipe device on a loading arm of a trestle bridge, based on any one of claims 1 to 10, characterized in that, include: Depending on the operational requirements, an adjustment mechanism may or may not be installed inside the outer tube (5) of the vertical pipe. If an adjustment mechanism is installed inside the outer tube of the vertical pipe, the adjustment mechanism is connected to the telescopic inner tube (9) of the vertical pipe. When no operation is being performed, the telescopic inner tube (9) of the vertical pipe is retracted inside the outer tube (5). During the oil loading operation, as the amount of oil in the telescopic inner tube (9) of the vertical pipe increases, the telescopic inner tube (9) of the vertical pipe compresses the compression spring (8) under the action of gravity. The telescopic inner tube (9) of the vertical pipe extends out from inside the outer tube (5), and the crude oil flows out from the outlet hole (11). After the oil loading operation, the amount of crude oil in the telescopic inner tube (9) of the vertical pipe decreases, the pressure on the compression spring (8) decreases, and the compression spring (8) overcomes gravity to pull the inner tube (9) of the telescopic inner tube back into the outer tube (5).

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