Lead screw protection device applied to complex environment

Abstract

The lead screw protection device applied to the complex environment comprises an airtight cylinder with two open ends, internal threads are formed on the inner side of one end of the airtight cylinder, the internal threads are used for being screwed with an exposed lead screw, the other end of the airtight cylinder is connected with a sealing cover in a sealed mode, an oil cup is formed at one end of the airtight cylinder, and the oil cup is connected with the sealing cover in a sealed mode. The oil cup is located at the end, away from the sealing cover, of the internal thread. The lead screw sealing device has the advantages that the airtight barrel is sealed through grease, the exposed lead screw in the airtight barrel is prevented from being polluted and corroded by the external environment, the exposed lead screw can be protected from being physically damaged or covered with paint, cement blocks and the like through the airtight barrel, the exposed lead screw is lubricated through grease, the lead screw is further protected from being corroded, and the service life of the lead screw is prolonged. According to the utility model, the bolt can be smoothly disassembled during the qualification detection of the grounding resistor, so that the bolt disassembly efficiency is improved, and the qualification detection efficiency of the grounding resistor is improved.

Description

Technical Field

[0001] The utility model relates to a mechanical structure for bolt protection, in particular to a screw rod protection device applied in complex environments. Background Art

[0002] The working media of oil and gas stations, such as oil tanks, separators, and manifolds, are all flammable and explosive items, and have very high requirements for lightning protection and anti-static. These devices are connected to the earth through flat steel as grounding devices to discharge lightning and static electricity. These devices are required to be grounded at least twice, and each is equipped with a disconnect card, which is connected with bolts. They must be disassembled every year and tested for grounding resistance qualification using instruments. All stations need to be tested 1 to 2 times a year, and a large number of bolts need to be disassembled during the test.

[0003] At present, in flammable and explosive places such as oil and gas production and gathering stations, the bolts on the oil tanks, separators, manifolds, and pipelines of the production equipment have some screw threads exposed to the environment. Since the geographical location of oil and gas production and gathering stations is mostly in mountainous suburbs, there is humidity, sun and rain, especially the gas in the environment of some natural gas sulfur-containing stations is highly corrosive to bolts, and the bolt screws are severely corroded, making it very difficult to remove the bolts. At the same time, frequent construction work in the production site will also cause physical damage to the exposed threads of the bolts or cover them with paint, cement blocks, etc., which will also make it very difficult to remove the bolts, which will lead to low efficiency in removing the bolts during inspection and low inspection efficiency. Utility Model Content

[0004] The technical problem to be solved by the utility model is that when performing grounding resistance qualification detection, the exposed screw rod of the bolt is corroded, resulting in low efficiency in bolt disassembly. The purpose is to provide a screw rod protection device for use in complex environments to solve the problem of low efficiency in bolt disassembly due to corrosion of the exposed screw rod of the bolt by rainwater and gas in the environment.

[0005] The utility model is realized by the following technical solutions:

[0006] A screw protection device for use in complex environments, comprising an airtight cylinder with both ends open, an inner thread formed on the inner side of one end of the airtight cylinder, the inner thread being used to screw with the exposed screw, a sealing cover being sealingly connected to the other end of the airtight cylinder, an oil cup formed at one end of the airtight cylinder, the oil cup being located at the end of the inner thread away from the sealing cover.

[0007] The utility model adopts the above-mentioned scheme, by setting an airtight cylinder with open ends, and forming an internal thread on the inner side of one end of the airtight cylinder for screwing with the exposed screw rod, the exposed screw rod is protected in the airtight cylinder, and a sealing cover is sealed at the other end of the airtight cylinder, and the other end of the airtight cylinder is sealed by the sealing cover. An oil cup is formed at one end of the airtight cylinder, which is convenient for filling grease in the oil cup so that the grease seals the airtight cylinder, thereby preventing the exposed screw rod in the airtight cylinder from being polluted and corroded by the external environment. The airtight cylinder can also protect the exposed screw rod from being physically damaged or covered with paint, cement blocks, etc., and the exposed screw rod is lubricated by grease to further protect the screw rod from corrosion, so that when performing the ground resistance qualification test, the bolts can be removed smoothly, thereby improving the bolt removal efficiency and further improving the ground resistance qualification test efficiency.

[0008] Preferably, the sealing cover is in the shape of a long cylinder with one end open and the other end closed, one end of the airtight tube is sealed and connected inside the sealing cover, and positive pressure is formed in the cavity between the closed end of the sealing cover and the internal thread of the airtight tube.

[0009] In this way, by making the sealing cover as a whole into a long cylindrical shape with one end open and the other end closed, when one end of the airtight cylinder is sealed and connected to the sealing cover, a positive pressure is formed in the cavity between the closed end of the sealing cover and the internal thread of the airtight cylinder. The positive pressure can further prevent pollutants from the external environment from entering the airtight cylinder and contaminating the exposed screw rod.

[0010] Preferably, an annular groove is formed on the outer side of the airtight cylinder, a sealing rubber ring is installed in the annular groove, and the outer side of the sealing rubber ring is interference fit with the inner side of the sealing cover.

[0011] In this way, by forming an annular groove on the outside of the airtight cylinder for installing the sealing rubber ring, the outside of the sealing rubber ring is facilitated to have an interference fit with the inside of the sealing cover, which is beneficial to forming a positive pressure in the cavity between the closed end of the sealing cover and the internal thread of the airtight cylinder, thereby preventing external environmental pollutants from entering the airtight cylinder.

[0012] Preferably, at least one oil groove is formed in the internal thread, and the oil groove is arranged along the axial direction of the airtight cylinder and passes through the internal thread.

[0013] In this way, by forming at least one oil groove in the internal thread, and arranging the oil groove along the axial direction of the airtight cylinder and passing through the internal thread, grease can enter the internal thread through the oil groove, and be evenly applied to the thread during the thread screwing process. Excess grease enters the airtight cylinder, so that a sealed connection is formed between the internal thread and the threaded screw.

[0014] Preferably, the cross-section of the oil groove is V-shaped or U-shaped.

[0015] Preferably, the airtight cylinder is snap-connected with the sealing cover.

[0016] In this way, disassembly is facilitated by snapping the airtight cylinder and the sealing cover together.

[0017] Preferably, at least one fixing pin is connected to the outer side of the airtight cylinder, and a hook hole is provided at the open end of the sealing cover, and the fixing pin cooperates with the hook hole to form a snap connection.

[0018] In this way, at least one fixing pin is connected to the outer side of the airtight cylinder and cooperates with the hook hole arranged at the open end of the sealing cover to form a snap connection, which facilitates quick connection and disassembly.

[0019] Preferably, the hook hole is L-shaped as a whole.

[0020] Preferably, a wrench portion is formed on the outer side of the airtight cylinder, and the wrench portion is located on the outer side of the internal thread.

[0021] In this way, by forming the wrench portion on the outer side of the airtight cylinder, it is convenient to screw the airtight cylinder by the wrench portion during installation or removal.

[0022] Preferably, a sealing gasket is further included, on which a through hole is formed for the exposed screw rod to pass through, and the sealing gasket is used to seal the grease in the oil cup.

[0023] In this way, by providing a sealing gasket, the grease can be sealed in the oil cup through the sealing gasket, so that the grease can be squeezed into the internal thread when the airtight cylinder is installed, so that a sealed connection is formed between the internal thread and the exposed screw rod.

[0024] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0025] 1. The exposed threads of the bolts and the exposed surfaces of the fastening nuts are inside the protective device to avoid contact with the outside world and isolate the pollution source. After the protective device is installed, the inside of the device is always in a positive pressure state, which effectively prevents corrosive gases and dirt from entering the internal corroding screw rods and nuts due to negative pressure formed by alternating hot and cold, better protects the bolts, makes the device and bolts easier to operate when disassembling, and improves work efficiency.

[0026] 2. Grease is pressed into the threads of the fastening nut, and the exposed threads of the bolt are also protected by the grease. The grease will not age or be washed away due to rain, wind, and sunlight, which further makes the device and bolts easier to operate during disassembly and improves work efficiency.

[0027] 3. The protective device has a simple structure and low cost. It can be disassembled by hand without the aid of tools. It has the characteristics of low cost and easy operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings described herein are used to provide a further understanding of the embodiments of the present utility model, constitute a part of this application, and do not constitute a limitation of the embodiments of the present utility model. In the drawings:

[0029] Figure 1 It is a structural diagram of the utility model;

[0030] Figure 2 It is a cross-sectional view of the utility model;

[0031] Figure 3 This is another visual structural diagram of the utility model.

[0032] Marks and corresponding parts names in the attached drawings:

[0033] 1-oil cup, 11-sealing gasket, 2-wrench part, 21-oil groove, 22-internal thread, 3-airtight cylinder, 31-fixing pin, 32-annular groove, 33-sealing rubber ring, 4-sealing cover, 41-hook hole. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the utility model more clearly understood, the utility model is further described in detail below in conjunction with embodiments and drawings. The schematic implementation manner of the utility model and its description are only used to explain the utility model and are not intended to limit the utility model.

[0035] Throughout the specification, references to "one embodiment," "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment of the present invention. Therefore, the phrases "one embodiment," "an embodiment," "an example," or "an example" appearing in various places throughout the specification do not necessarily all refer to the same embodiment or example. In addition, particular features, structures, or characteristics may be combined in one or more embodiments or examples in any appropriate combination and / or sub-combination. In addition, it will be appreciated by those of ordinary skill in the art that the diagrams provided herein are for illustrative purposes, and the diagrams are not necessarily drawn to scale. The term "and / or" used herein includes any and all combinations of one or more of the associated listed items.

[0036] In the description of the present invention, the terms "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the scope of protection of the present invention.

[0037] The terms "first", "second", etc. used in the present invention are only used to distinguish the corresponding components for the purpose of clarity of description, and are not intended to limit any order or emphasize importance, etc. In addition, the term "connected" used in this article can be directly connected or indirectly connected via other components without special explanation.

[0038] Example 1

[0039] This embodiment 1 provides a screw rod protection device for use in complex environments, such as Figure 1-Figure 3 As shown, it includes an airtight cylinder 3 with two ends open, an inner thread 22 is formed on the inner side of one end of the airtight cylinder 3, and the inner thread 22 is used to screw with the exposed screw rod, and the other end of the airtight cylinder 3 is sealed with a sealing cover 4, and an oil cup 1 is formed at one end of the airtight cylinder 3, and the oil cup 1 is located at the end of the inner thread 22 away from the sealing cover 4.

[0040] See also Figures 1 to 3 The sealing cover 4 is in the shape of a long cylinder with one end open and the other end closed. One end of the airtight tube 3 is sealed and connected to the sealing cover 4, and a positive pressure is formed in the cavity between the closed end of the sealing cover 4 and the internal thread 22 of the airtight tube 3. The positive pressure prevents objects in the external environment from entering the positive pressure cavity, protecting the exposed screw from corrosion.

[0041] See also Figures 1 to 3 An annular groove 32 is formed on the outer side of the airtight cylinder 3 , a sealing rubber ring 33 is installed in the annular groove 32 , and the outer side of the sealing rubber ring 33 is interference fit with the inner side of the sealing cover 4 .

[0042] See also Figures 1 to 3 At least one oil groove 21 is formed in the internal thread 22 , and the oil groove 21 is arranged along the axial direction of the airtight cylinder 3 and penetrates the internal thread 22 .

[0043] Specifically, when more than two oil grooves 21 are required, each oil groove 21 is evenly distributed along the side wall of the internal thread 22 .

[0044] See also Figures 1 to 3 The cross section of the oil groove 21 is V-shaped or U-shaped. Other cross-sectional structures that can satisfy the passage of grease can also be provided.

[0045] See also Figure 1 and Figure 3 The airtight cylinder 3 is snap-fitted with the sealing cover 4. The snap-fitting can be achieved by using a matching buckle and clip structure, as well as other mechanical snap-fitting structures.

[0046] See also Figure 1 and Figure 2At least one fixing pin 31 is connected to the outside of the airtight cylinder 3, and a hook hole 41 is provided at the open end of the sealing cover 4. The fixing pin 31 cooperates with the hook hole 41 to form a snap connection. The hook hole 41 is L-shaped as a whole. The hook hole 41 can adopt other shapes that can clamp the fixing pin 31.

[0047] See also Figure 1 and Figure 2 A wrench portion 2 is formed on the outer side of the airtight cylinder 3 , and the wrench portion 2 is located on the outer side of the internal thread 22 .

[0048] See also Figure 1 and Figure 3 , and also includes a sealing gasket 11, on which a through hole is formed for the exposed screw to pass through, and the sealing gasket 11 is used to seal the grease in the oil cup 1.

[0049] During operation, fill an appropriate amount of grease into the oil cup 1, align the outer ring of the sealing gasket 11 with the inner hole of the oil cup 1 to cover the cup mouth, and then cover the grease, and then tighten the airtight cylinder 3 on the exposed screw rod of the bolt. During the process of screwing in the airtight cylinder 3, the grease in the oil cup 1 is in a closed space. As the volume inside the airtight cylinder 3 becomes smaller, the grease is squeezed into the internal thread 22 and the thread of the screw rod, and the excess grease enters the airtight cylinder 3 through the oil groove 21 of the internal thread 22 and is evenly applied to the screw rod. At the same time, the grease and the sealing gasket 11 are deformed to form a seal.

[0050] Before putting on the sealing cap, a portable nitrogen tank can be used to inject nitrogen into the airtight cylinder 3 and the sealing cover 4 to replace the air inside. In this way, the inert gas in the protective device can improve the anti-corrosion effect and reduce the impact of gas expansion on the device during alternating hot and cold. The inner diameter of the cylinder of the sealing cover 4 is slightly larger than the outer diameter of the open end of the airtight cylinder 3 but smaller than the maximum outer diameter of the sealing rubber ring 33 and is polished. The material of the sealing rubber ring 33 is oil-resistant rubber. When the sealing cap is put on the rubber ring and pushed in the direction of the bolt, the sealing rubber ring 33 is deformed by force to form a seal with the inner cylinder wall of the sealing cover 4. In the process of closing the sealing cover 4, the internal space of the protective device becomes smaller, and the gas in the cavity between the closed end of the sealing cover 4 and the internal thread 22 of the airtight cylinder 3 is compressed into a positive pressure.

[0051] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A screw protection device for use in complex environments, characterized in that: It comprises an airtight cylinder with both ends open, an inner thread is formed on the inner side of one end of the airtight cylinder, the inner thread is used to screw with the exposed screw rod, the other end of the airtight cylinder is sealed with a sealing cover, an oil cup is formed at one end of the airtight cylinder, and the oil cup is located at the end of the inner thread away from the sealing cover.

2. The screw rod protection device for use in complex environments according to claim 1 is characterized in that: The sealing cover is in the shape of a long cylinder with one end open and the other end closed. One end of the airtight tube is sealed in the sealing cover, and positive pressure is formed in the cavity between the closed end of the sealing cover and the internal thread of the airtight tube.

3. The screw rod protection device for use in complex environments according to claim 2 is characterized in that: An annular groove is formed on the outer side of the airtight cylinder, a sealing rubber ring is installed in the annular groove, and the outer side of the sealing rubber ring is interference-fitted with the inner side of the sealing cover.

4. The screw rod protection device for use in complex environments according to claim 1, characterized in that: At least one oil groove is formed in the internal thread, and the oil groove is arranged along the axial direction of the airtight cylinder and penetrates the internal thread.

5. The screw rod protection device for use in complex environments according to claim 4 is characterized in that: The cross section of the oil groove is V-shaped or U-shaped.

6. The screw rod protection device for use in complex environments according to claim 1, characterized in that: The airtight cylinder is clamped with the sealing cover.

7. The screw rod protection device for use in complex environments according to claim 6, characterized in that: At least one fixing pin is connected to the outer side of the airtight cylinder, and a hook hole is provided at the open end of the sealing cover, and the fixing pin cooperates with the hook hole to form a snap connection.

8. The screw rod protection device for use in complex environments according to claim 7, characterized in that: The hook hole is L-shaped as a whole.

9. The screw rod protection device for use in complex environments according to claim 1, characterized in that: A wrench portion is formed on the outer side of the airtight cylinder, and the wrench portion is located on the outer side of the internal thread.

10. The screw rod protection device for use in complex environments according to claim 1, characterized in that: It also includes a sealing gasket, on which a through hole is formed for the exposed screw rod to pass through, and the sealing gasket is used to seal the grease in the oil cup.

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