Lifting pipe sealing device

Abstract

The utility model discloses a lifting pipe sealing device, which belongs to the technical field of sealing equipment and comprises a hold-down mechanism and a support plate, the support plate fixes the hold-down mechanism, the lower portion of a guide inner ring is connected with a support ring, the upper portion of the guide inner ring is connected with the support plate, and the hold-down mechanism is connected with an upper pressing plate and drives the upper pressing plate to move up and down. The upper pressing plate drives the upper pressing plate pressing block to move up and down, a guide belt is fixed in the upper pressing plate pressing block and used for guide lubrication of movement between the lifting pipes, the first lifting pipe sealing ring is installed between the supporting plate and the sliding sealing block, and the second lifting pipe sealing ring is installed between the sliding sealing block and the supporting ring. And the sliding sealing ring is fixed between the sliding sealing block and the guide inner ring. The loading arm solves the problem of poor sealing effect in the prior art and is mainly applied to loading of loading arms.

Description

Technical Field

[0001] The utility model belongs to the technical field of petrochemical loading seals, and mainly relates to a lifting pipe sealing device. Background Art

[0002] As an efficient equipment for loading oil products, the large crane pipe occupies an important position in the petroleum, chemical and other industries with its fast loading speed and excellent efficiency. Its core structure consists of a horizontally movable trolley and bracket, which are cleverly installed on the steel structure truss. The trolley moves freely in the horizontal direction, while the vertical movement is strictly restricted, ensuring the stability and safety of the operation. The lifting tube is flexibly connected to the lifting cylinder on the bracket through a chain. This design allows the lifting tube to flexibly pass through the tee assembly and slide freely on it. The tee assembly is connected to the liquid pipeline through a telescopic sleeve or a universal rotating arm, further enhancing the flexibility and adaptability of the system. The horizontal movement under the traction of the cylinder enables the entire system to efficiently complete the loading task.

[0003] The lifting tube plays a crucial role in the operation of the large crane. The opening at its top mates tightly with the sealing cap, ensuring a tight seal during loading. When not loading, the lifting tube and the sealing cap rise together, reaching above the train's height limit to allow the tank car to pass safely. When loading is required, the lifting tube descends into the tank car, where its upper oil inlet precisely mates with the horizontal telescopic tube, and the sealing device, under its own weight, clings tightly to the tank car's opening.

[0004] However, train tank cars come in a wide variety of sizes and models, and the heights from the car openings to the rails vary from model to model, posing a severe challenge to the sealing device of the large crane pipe. The sealing device not only needs to adapt to tank cars of varying heights, but also needs to be reliably locked at any vertical position on the lifting tube. At the same time, because the lifting tube and the bracket are connected by a flexible chain, the rigidity is relatively insufficient. Therefore, when the sealing device presses the tank car opening, the lifting tube cannot be pushed up. In addition, there is often a certain deviation between the train tank car opening and the center of the large crane pipe, and some tank car openings are tilted and uneven, all of which have an adverse effect on the sealing effect.

[0005] In the prior art, large cranes are primarily used for loading light oil or chemical products such as gasoline, jet fuel, and benzene into tank cars. These media are highly volatile, and large cranes are loaded quickly, generating large amounts of oil and gas during loading. Currently, the sealing covers used for enclosed loading of large cranes primarily include flat-plate sealing covers and flat-plate folding sealing covers. These sealing covers primarily rely on their own weight to compress the rubber pads to achieve a sealing effect. However, due to the light weight of the sealing covers, they cannot generate sufficient compression force to deform the rubber pads to fit tightly against the tank opening, resulting in serious oil and gas leakage problems and failure to meet the requirements of the "Emission Standards for Air Pollutants from Oil Storage Depots."

[0006] To address this issue, our company has developed a locking seal for large crane pipes (Application No. 201910347122.0). By clamping the lift pipe and then pressing down on the cover plate assembly, this device achieves an excellent seal at the tank opening, meeting the desired requirements. However, in actual use, we found that many large crane pipe lift pipes retrofitted on-site had severe surface scratches due to long-term use. The original design used a combination of a lip seal and packing compression to seal the lift pipe. This seal method provides excellent sealing when the lift pipe surface is in good condition. However, when the lift pipe is severely scratched, the packing fails to form an effective seal and cannot close the gaps in the scratched lift pipe. Furthermore, the lip seal will swell to a certain extent after prolonged use, resulting in a gap in the lip seal groove that cannot meet the required swelling requirements. This causes the lip seal surface to tightly grip the lift pipe, directly pulling the seal upward when the lift pipe rises, causing damage to the equipment.

[0007] In order to solve this problem, we urgently need a new type of large crane pipe sealing device lifting pipe locking sealing mechanism to effectively prevent the lifting pipe from damaging the lip seal and packing during the up and down sliding process, thereby avoiding the occurrence of gas leakage problems. Summary of the Invention

[0008] In order to solve the technical problems in the background art, the applicant conducted research and innovation through the R&D team, and completely overcame the technical problems raised in the background art through a lifting tube sealing device. The technical solution adopted is as follows:

[0009] A lifting tube sealing device includes a clamping mechanism and a support plate, and the support plate fixes the clamping mechanism. The core improvements of the utility model are as follows: the lower part of the guide inner ring is connected to the support ring, the upper part of the guide inner ring is connected to the support plate, the clamping mechanism is connected to the upper pressure plate and drives the upper pressure plate to move up and down, the upper pressure plate drives the upper pressure plate pressure block to move up and down, and the internal fixed guide belt of the upper pressure plate pressure block is used for guiding lubrication of the movement between the lifting tubes, the lifting tube sealing ring 1 is installed between the support plate and the sliding sealing block, the lifting tube sealing ring 2 is installed between the sliding sealing block and the support ring, and the sliding sealing ring is fixed between the sliding sealing block and the guide inner ring.

[0010] Preferably: in order to adjust the compression gap, an adjusting limit bolt is provided on the upper pressure plate, and the adjusting limit bolt is used to adjust the compression gap between the lifting pipe sealing ring 1 and the lifting pipe sealing ring 2.

[0011] The core of this innovative design lies in the unique and completely independent design concept of the clamping mechanism.

[0012] The clamping mechanism is cleverly designed to automatically release under hydraulic control when the lift tube is adjusted or moved up and down. This allows for a moderate gap between the seal inside the sealing device and the lift tube. This design not only allows the lift tube a certain degree of freedom during movement, avoiding friction scratches caused by direct contact, effectively protecting the seal from physical damage, but also ensures smooth operation of the entire system during dynamic adjustment.

[0013] During loading operations, a crucial moment when sealing performance must be ensured, the clamping mechanism activates quickly and precisely. It applies sufficient pressure to force the seal inside the device to fit tightly against the surface of the lift tube, forming a solid, leak-proof barrier. This critical sealing process not only prevents leakage of media during loading due to a poor seal, ensuring a safe and clean working environment, but also significantly extends the service life of the seals and reduces the maintenance costs and time associated with frequent seal replacements.

[0014] In summary, the lifting tube locking sealing mechanism of the large crane tube sealing device not only fundamentally solves the sealing problem between the lifting tube and the sealing device through its innovative clamping mechanism design, effectively prevents damage to the seal, but also significantly improves operational efficiency and safety. It is an important technological innovation that is indispensable in liquid loading and unloading operations in industries such as petrochemicals, grain and oil storage.

[0015] The utility model has the following advantages:

[0016] The design of the utility model is unique and the sealing effect is better. The utility model compresses the seal when it is closed and loosens the gap when it is not closed. In actual application, a double-layer sealing structure is adopted, and the entire seal is more secure. The utility model can also adjust the sealing clamping gap by adjusting the limit bolt to control the sealing compression margin. In actual application, the sealing effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional diagram of the utility model;

[0018] Figure 2 It is a cross-sectional view of the utility model;

[0019] Figure 3 It is a cross-sectional view of the pressing mechanism of the present invention when pressing;

[0020] Figure 4 This is a state structure diagram of the utility model.

[0021] In the figure: 1 Upper clamping mechanism; 2 Lower clamping mechanism; 3 Lower pressing mechanism; 4 Lifting tube sealing device; 4.1 Upper pressure plate pressure block; 4.2 Upper pressure plate; 4.3 Support plate; 4.4 Clamping mechanism; 4.5 Guide inner ring; 4.6 Support ring; 4.7 Guide belt; 4.8 Lifting tube sealing ring 1; 4.9 Sliding sealing ring; 4.10 Sliding sealing block; 4.11 Lifting tube sealing ring 2; 4.12 Adjustment limit bolt; 5 Cover plate assembly; 6 Lifting tube. DETAILED DESCRIPTION Example 1

[0022] like Figures 1-4 As shown:

[0023] When used, the utility model is used in conjunction with the upper clamping mechanism 1, the lower clamping mechanism 2, the lower pressing mechanism 3 and the cover plate assembly 5. Regarding the upper clamping mechanism 1, the lower clamping mechanism 2, the lower pressing mechanism 3 and the cover plate assembly 5, please refer to patent application number 201910347122.0. The patent name is: A large crane pipe locking sealing device. The above patent is the applicant's first patent application.

[0024] The upper clamping mechanism 1 is used to clamp the fixed lifting tube, the lower clamping mechanism 2 is used to clamp the lower part of the lifting tube, and the fixed cover assembly pressing mechanism 3 is used to press the cover assembly 5 to ensure the airtightness between the cover assembly 5 and the tank mouth when loading.

[0025] The lift tube sealing device 4 is the core component of this utility model: the guide inner ring 4.5 is connected to the support ring 4.6 at the bottom and the support plate 4.3 at the top. The support plate 4.3 fixes the clamping mechanism 4.4, which is connected to the upper pressure plate 4.2 for up and down movement. The upper pressure plate 4.2 drives the upper pressure plate pressure block 4.1 for up and down movement. The upper pressure plate pressure block 4.1 has a fixed guide belt 4.7 inside, which provides guidance and lubrication for the movement of the lift tube 6. The lift tube sealing ring 1 4.8 is installed between the support plate 4.3 and the sliding sealing block 4.10. The lift tube sealing ring 2 4.11 is installed between the sliding sealing block 4.10 and the support ring 4.6. The sliding sealing ring 4.9 is fixed between the sliding sealing block 4.10 and the guide inner ring 4.5. The adjustment bolt 4.12 is fixed to the upper pressure plate 4.2 to adjust the clamping gap between the lift tube sealing ring 1 4.8 and the lift tube sealing ring 2 4.11.

[0026] The lifting tube sealing device seals as follows: First, the lifting tube 6 is lowered into the tank truck. At this point, the cover plate assembly 5 lands on the tank opening, initiating the locking and sealing process. The upper and lower clamping mechanisms 1 and 2 operate simultaneously, holding the lifting tube 6. After a delay, the lower pressing mechanism 3 and the lifting tube sealing device 4 operate simultaneously. The lower pressing mechanism 3 seals the cover plate assembly 5 against the tank opening. The lifting tube sealing device 4 begins with the action of the pressing mechanism 4.4, which drives the upper pressure plate 4.2 downward. This moves the upper pressure plate block 4.1 downward, which in turn drives the guide belt 4.7 downward. Simultaneously, the upper pressure plate block 4.1 presses the lifting tube sealing ring 1 4.8 downward, sealing it between the sliding sealing block 4.10. The lifting tube sealing ring 1 4.8 then moves downward, squeezing the lifting tube 6 together to form a double seal. Simultaneously, a seal is formed between the sliding sealing ring 4.9 and the sliding sealing block 4.10. This ensures a complete seal of the tank opening during loading.

[0027] The recovery process of the closed folding cleaning device: the sealing process of the lifting tube locking and sealing mechanism is reversed, the lifting tube sealing ring is loosened to open the gap, and then the lifting tube is lifted to complete the loading.

[0028] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any other form. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes for application in other fields. However, any simple modification, equivalent change and modification of the above embodiment made according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A lifting tube sealing device, comprising a pressing mechanism (4.4) and a support plate (4.3), wherein the support plate (4.3) fixes the pressing mechanism (4.4), and is characterized in that: The lower part of the guide inner ring (4.5) is connected to the support ring (4.6), the upper part of the guide inner ring is connected to the support plate (4.3), the clamping mechanism (4.4) is connected to the upper pressure plate (4.2) and drives the upper pressure plate (4.2) to move up and down, the upper pressure plate (4.2) drives the upper pressure plate pressing block (4.1) to move up and down, the upper pressure plate pressing block (4.1) internally fixed with a guide belt (4.7) is used for guiding lubrication of movement between the lifting tube (6), the lifting tube sealing ring (4.8) is installed between the support plate (4.3) and the sliding sealing block (4.10), the lifting tube sealing ring (4.11) is installed between the sliding sealing block (4.10) and the support ring (4.6), and the sliding sealing ring (4.9) is fixed between the sliding sealing block (4.10) and the guide inner ring (4.5).

2. The lifting tube sealing device according to claim 1, wherein: An adjusting limit bolt (4.12) is provided on the upper pressure plate (4.2), and the adjusting limit bolt (4.12) is used to adjust the pressing gap between the lifting tube sealing ring 1 (4.8) and the lifting tube sealing ring 2 (4.11).

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