Pneumatic sealing device for sealed loading and unloading vehicle of tank car

Abstract

The utility model relates to the technical field of sealing devices, and discloses a pneumatic sealing device for a sealed loading and unloading vehicle of a tank truck, which adopts the working principle that friction force between the pneumatic sealing device and the inner wall of a tank opening is used for providing balance support, so that the pneumatic sealing device is safe and reliable. The bottom face of the tank opening does not need to be used for supporting, and the adverse effect of the inner height change of the tank opening on the pneumatic sealing device can be avoided. According to the pneumatic sealing device for the sealed loading and unloading vehicle of the tank car, a clamping jaw (or hook) structure is not needed, and the whole structure is simpler and more reliable; when the device is placed in a tank opening, the supporting air cylinder can be retracted into the protective cover, and therefore the risk of tank opening collision is reduced. According to the pneumatic sealing device for the sealed loading and unloading vehicle of the tank car, all the air cylinders are arranged below the sealing cover plate, holes do not need to be additionally formed in the sealing cover plate due to movement of executing mechanisms such as the air cylinders, and therefore leakage points are reduced.

Description

Technical Field

[0001] This utility model relates to the field of sealing device technology, and in particular to a pneumatic sealing device for sealing tank truck loading and unloading. Background Technology

[0002] Existing pneumatic sealing devices for sealed tank truck loading and unloading vehicles (such as...) Figure 1 As shown), its main working principle is to use a cylinder to drive a claw structure (or hook structure). During operation, the claws press against the bottom surface of the can opening, overcoming the forces of gravity and gas pressure inside the can on the sealing device. This causes the sealing gel of the pneumatic sealing device to exert a squeezing force against the top surface of the can opening, thereby forming a seal. The main drawbacks of this structure are:

[0003] When inserting the sealing device, the jaws need to tighten to allow for unobstructed placement into the tank opening; when a seal is formed, the jaws need to open to abut against the bottom of the tank opening. However, in actual use, the tank opening standards of tank cars are not uniform, with inconsistent inner diameters and internal heights. For example, the inner diameter of a train tank car opening is typically 500mm-560mm, and the internal height is typically 200mm-350mm; while the inner diameter of a truck tank car opening is typically 250mm-350mm, and the internal height is typically 200mm-300mm. This increases the difficulty of jaw design, resulting in a situation where existing pneumatic sealing devices cannot simultaneously achieve both sufficient coverage and internal collision protection. The main problems are as follows:

[0004] 1. The sealing device cannot cover all tank openings in actual applications;

[0005] 2. When the sealing device can cover all tank openings, collisions with small inner diameter tank openings will frequently occur, leading to equipment damage and posing a safety risk.

[0006] 3. To avoid collisions, the size and stroke of the chuck are reduced, which often results in the chuck not being able to press tightly against the inner can opening.

[0007] 4. Since the cylinder stroke cannot be too small, the cylinder usually needs to be installed on the upper part of the sealing cover plate. The cylinder rod or chuck drive mechanism also needs to pass through the cover plate to reach the inside of the tank. This involves the dynamic sealing problem of the perforation. In actual use, leakage is prone to occur at the perforation, thus affecting the overall sealing performance. Utility Model Content

[0008] The purpose of this utility model is to provide a pneumatic sealing device for the sealed loading and unloading of tank trucks that is widely applicable, safe, reliable, and has good sealing performance.

[0009] The technical solution to achieve the purpose of this utility model is as follows:

[0010] The utility model provides a kind of pneumatic sealing device for tank car closed loading and unloading, it is characterized by including sealing cover plate, sealing rubber, pipeline connecting component, support cylinder, friction component, support component, sealing cylinder and protective cover;The outer side wall of the pipeline connecting component is fixedly connected with the sealing cover plate, and the bottom surface of the sealing cover plate is provided with the sealing rubber;The protective cover is arranged around the pipeline connecting component and below the sealing cover plate;The support component is arranged in the protective cover, and two or more sealing cylinders are arranged above the support component, one end of each sealing cylinder is fixedly connected with the support component, and the other end of each sealing cylinder is fixedly connected with the sealing cover plate;Two or more support cylinders are arranged below the support component, one end of each support cylinder is fixedly connected with the support component, and the other end of each support cylinder is fixedly connected with the friction component.

[0011] Preferably, two or more sealing cylinders are uniformly arranged above the support component and on the horizontal circumferential surface of the tank opening.

[0012] Preferably, two or more support cylinders are uniformly arranged below the support component and on the horizontal circumferential surface of the tank opening.

[0013] Preferably, the outer side wall of the pipeline connecting component is fixedly connected with the sealing cover plate by welding, and the bottom surface of the sealing cover plate is fixed with the sealing rubber by glue or bolts.

[0014] Preferably, the outer side of the support component is fixedly connected with the protective cover by bolt connection.

[0015] Preferably, the support cylinder and the sealing cylinder are both thin type cylinders.

[0016] Compared with the prior art, the utility model has the following advantages:

[0017] (1) The pneumatic sealing device for tank car closed loading and unloading utilizes the friction force between the pneumatic sealing device and the inner wall of the tank opening to provide balanced support, without the need to use the bottom surface of the tank opening for support, thereby avoiding the adverse effects of the inner height change of the tank opening on the pneumatic sealing device.

[0018] (2) The pneumatic sealing device for tank car closed loading and unloading does not need a claw (or hook) structure, and the overall structure is simpler and more reliable; when the device is placed in the tank opening, the support cylinder can be retracted into the protective cover, thereby reducing the risk of collision with the tank opening.

[0019] (3) All cylinders in the pneumatic sealing device for tank car closed loading and unloading are arranged below the sealing cover plate, without the need to increase holes on the sealing cover plate due to the movement of the cylinders and other actuators, thereby reducing the leakage points. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings required in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a typical structural diagram of an existing pneumatic sealing device.

[0022] Figure 2 This is a schematic diagram of the pneumatic sealing device for sealed loading and unloading of tank trucks according to the present invention.

[0023] Figure 3 This is a schematic diagram illustrating the working principle of the pneumatic sealing device for sealed loading and unloading of tank trucks according to this utility model. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Example 1:

[0026] like Figure 2As shown, a kind of pneumatic sealing device for tank car closed loading and unloading, including sealing cover plate 1, sealing rubber 2, pipeline connection component 3, support cylinder 4, friction component 5, support component 6, sealing cylinder 7 and protective cover 8;The outer side wall of the pipeline connection component 3 is fixedly connected with sealing cover plate 1 by welding, and sealing rubber 2 is fixed on the bottom surface of sealing cover plate 1 by glue or bolt.The protective cover 8 is located below the sealing cover plate 1, and the support component 6 is arranged in the protective cover 8.The support component 6 is fixedly connected with the protective cover 8 by bolt.Two or more sealing cylinders 7 are evenly arranged on the support component 6, and the sealing cylinder 7 is evenly arranged on the horizontal circumferential surface of tank opening.The one end of each sealing cylinder 7 is fixedly connected with the support component 6, and the other end of each sealing cylinder 7 is fixedly connected with the sealing cover plate 1.Two or more support cylinders 4 are evenly arranged below the support component 6, and the support cylinder 4 is evenly arranged on the horizontal circumferential surface of tank opening, so as to offset the internal interaction force of each support cylinder in horizontal direction.The one end of each support cylinder 4 is fixedly connected with the support component 6, and the other end of each support cylinder 4 is fixedly connected with the friction component 5.

[0027] As Figure 3 shown, the utility model discloses a kind of pneumatic sealing device for tank car closed loading and unloading working principle, in the drawing:

[0028] P——tank internal gas pressure;

[0029] G——the gravity of pneumatic sealing device itself;

[0030] F1——the force provided by single sealing cylinder;

[0031] F2——the force provided by single support cylinder;

[0032] F P ——the force of tank internal gas to sealing device;

[0033] F m ——the static friction force provided by single support cylinder, and the maximum static friction force is determined by F2 and static friction coefficient μ.

[0034] The utility model discloses a kind of pneumatic sealing device for tank car closed loading and unloading to keep stable effective sealing needs to meet simultaneously:

[0035] (1) the force provided by sealing cylinder is greater than the difference between the force of tank internal gas to sealing device and its gravity;

[0036] (2) the maximum static friction force is greater than the force provided by sealing cylinder;

[0037] BF1>F P -G

[0038] A μF2 > BF1

[0039] Wherein:

[0040] A - the number of support cylinders, greater than or equal to 2;

[0041] B - the number of sealing cylinders, greater than or equal to 2.

[0042] The utility model discloses a kind of pneumatic sealing devices for tank car closed loading and unloading design ideas:

[0043] 1, obtain necessary known parameter condition of design.

[0044] (1) tank internal gas pressure P;

[0045] (2) tank mouth inner diameter range d;

[0046] (3) the gas source pressure P of cylinder Q ;

[0047] (4) the static friction coefficient μ of friction assembly and tank mouth inner wall;

[0048] (5) estimated overall gravity G of pneumatic sealing device;

[0049] 2, according to the known parameter condition obtained, calculate and select appropriate cylinder.

[0050] (1) calculate F P With maximum d and P;

[0051]

[0052] (2) select the number of sealing cylinders, for example, adopt four sealing cylinder types;Calculate sealing cylinder bore D1;According to the condition that pneumatic sealing device keeps sealing balance state, should satisfy:

[0053]

[0054] (3) select the number of support cylinders, for example, adopt four support cylinder types;Calculate support cylinder bore D2;The maximum static friction force that support cylinder can provide should be greater than the force provided by sealing cylinder, so that support point does not slide.

[0055]

[0056] Because the effective stress section of cylinder pressure side and pull side is different (considering piston rod section), when calculating cylinder bore D1, D2, the influence of pressure side and pull side force difference should be considered in combination with the installation direction of cylinder.

[0057] (4) if the calculated cylinder bore is not suitable, the number of cylinders can be appropriately increased or decreased;

[0058] (5) According to the range of the inner diameter of the tank mouth, select the appropriate support cylinder stroke;

[0059] (6) According to the overall structure arrangement needs to select the appropriate sealing cylinder stroke;

[0060] (7) Preferably, the cylinder is a thin cylinder, so as to obtain a compact structure.

[0061] In summary, the utility model discloses a pneumatic sealing device for tank car closed loading and unloading vehicle, which utilizes the friction force between the pneumatic sealing device and the inner wall of the tank mouth to provide balanced support without using the bottom surface of the tank mouth for support, thereby avoiding the adverse effects of the inner diameter change of the tank mouth on the pneumatic sealing device. The utility model discloses a pneumatic sealing device for tank car closed loading and unloading vehicle, which does not need a claw (or hook) structure, and the overall structure is simpler and more reliable. When the device is placed in the tank mouth, the support cylinder can be retracted into the protective cover, thereby reducing the risk of collision with the tank mouth. In the utility model discloses a pneumatic sealing device for tank car closed loading and unloading vehicle, all the cylinders are arranged below the sealing cover plate, and no holes are needed on the sealing cover plate due to the movement of the cylinders and other actuators, thereby reducing the leakage points.

[0062] Finally, it should be noted that: the above only for the preferred embodiments of the utility model have described, and do not limit the utility model, although the utility model has been described in detail with reference to the foregoing embodiments, for the person skilled in the art, it still can modify the technical scheme recorded in the foregoing each embodiment, or equivalent replacement to part of technical features. Any modification, equivalent replacement, improvement etc. within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A pneumatic seal for use in the closed loading and unloading of tank vehicles, characterized in that The utility model provides a pipeline connecting assembly, sealing cover plate (1), sealing rubber (2), pipeline connecting assembly (3), support cylinder (4), friction assembly (5), support assembly (6), sealing cylinder (7) and protective cover (8) are included, the outer side wall of pipeline connecting assembly (3) is fixedly connected with sealing cover plate (1), and the bottom surface of sealing cover plate (1) is provided with sealing rubber (2);The periphery of pipeline connecting assembly (3) is provided with protective cover (8), and protective cover (8) is located below sealing cover plate (1);Support assembly (6) is arranged in protective cover (8), and the top of support assembly (6) is provided with two or more than two sealing cylinders (7), one end of each sealing cylinder (7) is fixedly connected with support assembly (6), and the other end of each sealing cylinder (7) is fixedly connected with sealing cover plate (1);The bottom of support assembly (6) is provided with two or more than two support cylinders (4), one end of each support cylinder (4) is fixedly connected with support assembly (6), and the other end of each support cylinder (4) is fixedly connected with friction assembly (5).

2. A pneumatic seal for use in the closed loading and unloading of tank vehicles as claimed in claim 1, characterised in that, The top of support assembly (6) is evenly provided with two or more than two sealing cylinders (7), and the sealing cylinders (7) are evenly arranged on the horizontal circumferential surface of the tank mouth.

3. A pneumatic seal for use in the closed loading and unloading of tank vehicles as defined in claim 1, characterized in that The bottom of support assembly (6) is evenly provided with two or more than two support cylinders (4), and the support cylinders (4) are evenly arranged on the horizontal circumferential surface of the tank mouth.

4. A pneumatic seal for use in the closed loading and unloading of tank vehicles as defined in claim 1, characterized in that The outer side wall of pipeline connecting assembly (3) is fixedly connected with sealing cover plate (1) by welding, and the bottom surface of sealing cover plate (1) is fixed with sealing rubber (2) by glue or bolt.

5. A pneumatic seal for use in the closed loading and unloading of tank vehicles as defined in claim 1, characterized in that Support assembly (6) is fixedly connected with protective cover (8) by bolt connection.

6. A pneumatic seal for use in the closed loading and unloading of tank vehicles as defined in claim 1, characterized in that The support cylinder (4) and the sealing cylinder (7) are all selected to be thin type cylinder.

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