Anti-unbalance-loading double-static-seal guide sleeve structure for unit support stand column

Abstract

An unbalance-loading-resistant double-static-seal guide sleeve structure for a unit support stand column comprises a guide sleeve body, the outer circumference of the guide sleeve body is of a three-step structure with the outer diameter gradually increased from front to back, and the outer circumference of the guide sleeve body is divided into a first step, a second step and a third step from the front end; a flange end is integrally formed at the rear end of the guide sleeve body; the first step is an inner static sealing surface which is tightly matched with the inner wall of a cylinder opening of the cylinder body, and a Y-shaped sealing groove and a D-shaped sealing groove which are spaced front and back are formed in the first step; the second step is provided with a rectangular thread matched with an internal thread of a cylinder opening of the cylinder body. The third step is an outer static sealing face which is in close fit with an outer spigot of the cylinder body, and an O-shaped sealing groove is formed between the third step and the flange end. According to the utility model, the rectangular thread can be isolated from liquid contact, the corrosion of the rectangular thread part is slowed down, double static sealing can be realized, the sealing effect is improved, the unbalance loading resistance is improved, and the guide sleeve is prevented from deforming.

Description

Technical Field

[0001] This utility model relates to the technical field, specifically to a double static sealing guide sleeve structure for anti-eccentric load in unit support columns. This guide sleeve structure is mainly used in unit support columns and can effectively prevent leakage due to high pressure inside the cylinder and deformation of the guide sleeve under eccentric load under severe stress conditions such as severe eccentric load on the support, thereby ensuring the safety of column use. Background Technology

[0002] Unit-type supports are a widely used type of support system. The key component is the upright column, and the guide sleeve of the upright column plays a guiding role. Sudden impact loads and eccentric loads downhole can significantly affect the structure of the guide sleeve; as shown in the attached diagram. Figure 1 As shown, in the existing guide sleeve structure, the rectangular thread 1 is inside, and the static sealing surface and Y-type static seal 2 are outside the rectangular thread 1. Although it can resist the impact and uneven load to a certain extent, there is a gap between the threads. When the column is subjected to uneven load, the liquid pressure in the cylinder 8 rises sharply, and the safety valve cannot release the pressure in time. The guide sleeve is severely compressed at the uneven load point and is easily loosened by the fluctuation of the internal liquid, which can easily lead to leakage at the gap of the rectangular thread 1, causing the Y-type static seal 2 to fail locally. At the same time, the underground environment of the coal mine is relatively harsh. The rectangular thread 1 is in direct contact with the liquid, and the rectangular thread 1 will rust over time. In addition, the deformation of the guide sleeve caused by the uneven load will make the rectangular thread 1 directly resist the deformation of the force, which will cause great difficulties for the later maintenance and disassembly of the column.

[0003] Chinese utility model patent CN202122351351.5 discloses a leak-proof large guide sleeve and a leak-proof structure for the large guide sleeve of a hydraulic support column. The large guide sleeve has a two-stage stepped outer wall. A Y-shaped static sealing groove is formed on the first stage near the front end of the guide sleeve. An annular limiting platform is provided behind the second stage, and a dustproof ring installation groove is provided between the limiting platform and the second stage. An O-ring sealing groove is also formed on the first stage behind the Y-shaped static sealing groove. This patent solves the technical problem of external leakage from the large guide sleeve caused by partial failure of the static seal due to severe off-center loading and foreign object contamination during downhole use. Although this leak-proof large guide sleeve can prevent leakage, the threads on it are easily deformed under pressure when subjected to off-center loading, affecting subsequent maintenance and disassembly of the support column. Summary of the Invention

[0004] The purpose of this utility model is to address the shortcomings of the existing technology by providing a double static seal guide sleeve structure for unit support columns that resists eccentric loads. This utility model aims to solve the technical problems of guide sleeve static seal failure and deformation caused by eccentric loads, as well as the technical problem of rectangular thread corrosion caused by long-term direct contact between rectangular threads and liquids.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a double static seal guide sleeve structure for anti-eccentric load of a unit support column, comprising a guide sleeve body, wherein the outer circumference of the guide sleeve body is a three-stage stepped structure with the outer diameter gradually increasing from front to back. Starting from the front end, the outer circumference of the guide sleeve body is divided into a first step, a second step, and a third step. The rear end of the guide sleeve body is integrally formed with a flange end; the first step is an inner static seal surface that tightly fits with the inner wall of the cylinder bore, and the first step is provided with Y-shaped sealing grooves and D-shaped sealing grooves spaced apart front and back. The Y-shaped sealing groove is used to install a Y-shaped static seal, and the D-shaped sealing groove is used to install a D-shaped static seal; the second step is provided with a rectangular thread that fits with the internal thread of the cylinder bore; the third step is an outer static seal surface that tightly fits with the outer stop of the cylinder, and an O-ring sealing groove for installing an O-ring is provided between the third step and the flange end.

[0006] Based on the above, the coaxiality of the first step, the second step, and the third step is controlled within φ0.06mm.

[0007] Based on the above, the front end of the first step and the area between the second step and the third step are all chamfered; the bottom sides of the Y-shaped sealing groove, the D-shaped sealing groove and the O-shaped sealing groove are rounded to R0.2mm, and the sides of the groove sides are rounded to R0.3mm. The surface roughness of the Y-shaped sealing groove, the D-shaped sealing groove and the O-shaped sealing groove is lower than Ra1.6 and is polished.

[0008] Based on the above, all chamfered and rounded surfaces are coated.

[0009] This invention represents a substantial improvement over existing technologies. Specifically, by optimizing the guide sleeve structure, the outer circumference of the guide sleeve body features a three-tiered stepped structure with progressively increasing outer diameter from front to back. Starting from the front end, the first tier has a static seal structure, the second tier has a rectangular thread, and the third tier serves as an external static seal surface that tightly fits with the cylinder body's outer stop. This design modifies the existing static seal structure and position, allowing the static seal to be installed inside the rectangular thread. This isolates the rectangular thread from liquid contact, reducing corrosion in the rectangular thread area. Furthermore, the static seal structure is designed with alternating Y-shaped and D-shaped sealing grooves, achieving double static seals, increasing sealing effectiveness, and preventing leakage. After the guide sleeve structure optimization, a portion of the external static seal surface, the third tier, is retained on the outer edge of the rectangular thread. This third tier tightly fits with the cylinder body's outer stop, providing resistance to eccentric loads, improving eccentric load resistance, preventing guide sleeve deformation, and thus avoiding direct deformation of the rectangular thread under stress, ensuring smooth disassembly and maintenance of the column later. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the existing guide sleeve structure.

[0011] Figure 2 This is a schematic diagram of the guide sleeve structure of this utility model.

[0012] Figure 3 This is a schematic diagram of the guide sleeve structure of this utility model.

[0013] In the diagram: 1. Rectangular thread; 2. Y-type static seal; 3. Guide sleeve body; 4. First step; 5. Second step; 6. Third step; 7. Flange end; 8. Cylinder body; 9. Y-type sealing groove; 10. D-type sealing groove; 11. D-type static seal; 12. O-ring seal; 13. O-ring sealing groove. Detailed Implementation

[0014] The technical solution of this utility model will be further described in detail below through specific embodiments.

[0015] like Figure 2 and Figure 3As shown, a double static seal guide sleeve structure for anti-eccentric load of a unit support column includes a guide sleeve body 3. The outer circumference of the guide sleeve body 3 is a three-stage stepped structure with the outer diameter gradually increasing from front to back. Starting from the front end, the outer circumference of the guide sleeve body 3 is divided into a first step 4, a second step 5, and a third step 6. The rear end of the guide sleeve body 3 is integrally formed with a flange end 7. The first step 4 is an inner static seal surface that tightly fits with the inner wall of the cylinder bore of the cylinder body 8. Y-shaped sealing grooves 9 and D-shaped sealing grooves 10 are machined sequentially from front to back on the first step 4. The Y-shaped sealing groove 9 is used to install a Y-shaped static seal 2, and the D-shaped sealing groove 10 is used to install a D-shaped static seal 11. The second step 5 is provided with a rectangular thread 1 that fits with the internal thread of the cylinder bore of the cylinder body 8. The third step 6 is an outer static seal surface that tightly fits with the outer stop of the cylinder body 8. An O-ring sealing groove 13 for installing an O-ring sealing ring 12 is provided between the third step 6 and the flange end 7.

[0016] When this double static seal guide sleeve structure is assembled and used, the first step 4 fits tightly with the inner wall of the cylinder 8. A Y-type static seal 2 is installed in the Y-type sealing groove 9, and a D-type static seal 11 is installed in the D-type sealing groove 10, thus achieving a double static seal and increasing the sealing effect. Furthermore, the Y-type static seal 2 and D-type static seal 11 are located inside the rectangular thread 1, which isolates the rectangular thread 1 from liquid contact and slows down corrosion of the rectangular thread 1. The third step 6 fits tightly with the outer stop of the cylinder 8, providing resistance to eccentric loads, improving the resistance to eccentric loads, preventing deformation of the guide sleeve, and thus avoiding direct deformation of the rectangular thread 1 under stress, ensuring smooth disassembly and maintenance of the column later. An O-ring 12 is installed in the O-type sealing groove 13, providing dust prevention and sealing.

[0017] Furthermore, this double static sealing guide sleeve structure is formed by one-time clamping and machining (conventional technology). The coaxiality of the first step 4, the second step 5, and the third step 6 is controlled within φ0.06mm. Chamfers are provided at the front end of the first step 4 and between the second step 5 and the third step 6 (to remove surface burrs and sharp parts). The bottom sides of the Y-shaped sealing groove 9, the D-shaped sealing groove 10, and the O-shaped sealing groove 13 are rounded to R0.2mm, and the sides of the groove sides are rounded to R0.3mm. The surface roughness of the Y-shaped sealing groove 9, the D-shaped sealing groove 10, and the O-shaped sealing groove 13 is lower than Ra1.6 and is polished using silicon oxide spraying (conventional technology). This design ensures the quality of the structural machining.

[0018] In this embodiment, the Y-shaped sealing groove 9 and the D-shaped sealing groove 10 are the same size.

[0019] All chamfered and rounded surfaces are coated to ensure a burr-free finish.

[0020] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A double static sealing guide sleeve structure for resisting eccentric loads in unit support columns, characterized in that: The system includes a guide sleeve body, the outer circumference of which has a three-stage stepped structure with the outer diameter gradually increasing from front to back. Starting from the front end, the outer circumference of the guide sleeve body is divided into a first step, a second step, and a third step. The rear end of the guide sleeve body is integrally formed with a flange end. The first step is an internal static sealing surface that tightly fits with the inner wall of the cylinder bore, and the first step is provided with Y-shaped sealing grooves and D-shaped sealing grooves spaced apart front and back. The Y-shaped sealing groove is used to install a Y-shaped static seal, and the D-shaped sealing groove is used to install a D-shaped static seal. The second step is provided with a rectangular thread that fits with the internal thread of the cylinder bore. The third step is an external static sealing surface that tightly fits with the outer stop of the cylinder, and an O-ring sealing groove for installing an O-ring is provided between the third step and the flange end.

2. The double static sealing guide sleeve structure for anti-eccentric load of the unit support column according to claim 1, characterized in that: The coaxiality of the first step, the second step, and the third step is controlled within φ0.06mm.

3. The double static sealing guide sleeve structure for anti-eccentric load of the unit support column according to claim 1, characterized in that: The front end of the first step and the area between the second step and the third step are all chamfered; the bottom sides of the Y-shaped sealing groove, the D-shaped sealing groove and the O-shaped sealing groove are rounded to R0.2mm, and the sides of the groove sides are rounded to R0.3mm. The surface roughness of the Y-shaped sealing groove, the D-shaped sealing groove and the O-shaped sealing groove is lower than Ra1.6 and is polished.

4. The double static sealing guide sleeve structure for anti-eccentric load of unit support column according to claim 3, characterized in that: All chamfered and rounded surfaces are coated.

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