Anti-deviation adjusting device for stainless steel manhole cover of liquid storage tank

Abstract

The utility model provides a kind of liquid storage tank stainless steel manhole cover prevents deviation adjusting device, including being provided with annular rim manhole ring, with manhole cover matching manhole ring, connecting rod, bracing bar and butterfly nut;The bracing bar is vertically installed on manhole cover by screw rod;The butterfly nut is installed on the screw rod above bracing bar;Connecting rod one end is rotatably connected on storage tank pipe body, and other end is connected with manhole cover;The deviation preventing adjusting device further includes adjusting screw rod, mounting block and sealing ring;Four groups of mounting blocks are symmetrically welded on the upper surface central axis of manhole cover;The adjusting screw rod is installed on mounting block by thread;The adjusting screw rod is rectangular distribution;Sealing ring is embedded between the contact surface of manhole cover and manhole ring;The length of bracing bar is greater than the diameter of manhole ring, and the utility model has the beneficial effects of: anti-deviation capacity is improved, single high-efficiency operation, and sealing performance is optimized.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical manufacturing technology, specifically relating to an anti-offset adjustment device for a stainless steel manhole cover of a liquid storage tank. Background Technology

[0002] Existing manhole cover sealing structures for liquid storage tanks generally employ a multi-bolt fixing method, which has the following technical defects: 1. Misalignment risk: Pressure fluctuations inside the tank (such as when the working pressure is ≥0.8MPa) and thermal expansion and contraction (when the temperature difference is ≥80℃) can easily lead to a decrease in bolt preload, causing the manhole cover to shift and resulting in sealing failure (leakage rate can reach 0.3%~0.8% / year). 2. Low disassembly and assembly efficiency: Traditional solutions require at least two operators to work together to tighten / loosen 12 to 16 bolts, with each disassembly and assembly taking ≥45 minutes; 3. Lack of dynamic adjustment: Existing sealing rings (such as ordinary O-rings) cannot compensate for tank deformation, and the wear rate of the sealing surface is as high as 15%~20% after long-term use. Utility Model Content

[0003] To address the aforementioned problems, the purpose of this utility model is to provide a stainless steel manhole cover anti-offset adjustment device for liquid storage tanks that can solve the problem of manhole cover shifting due to long-term pressure inside the tank and thermal expansion and contraction, and can be installed and disassembled by an operator independently.

[0004] This utility model is achieved through the following technical solution: An anti-displacement adjustment device for a stainless steel manhole cover of a liquid storage tank includes a manhole ring with an annular edge, a manhole cover matching the manhole ring, a connecting rod, a support rod, and a wing nut. The support rod is vertically mounted on the manhole cover via a threaded rod. The wing nut is mounted on the threaded rod above the support rod. One end of the connecting rod is rotatably connected to the storage tank body, and the other end is connected to the manhole cover. The anti-displacement adjustment device also includes an adjusting screw, mounting blocks, and a sealing ring. Four sets of mounting blocks are symmetrically welded to both ends of the central axis on the upper surface of the manhole cover. The adjusting screw is threaded onto the mounting blocks. The rods are arranged in a rectangular pattern; the sealing ring is embedded between the contact surfaces of the manhole cover and the manhole ring; the length of the support rod is greater than the diameter of the manhole ring; the inner wall of the manhole ring is provided with a limiting groove that matches the adjusting screw; the contact surface between the support rod and the manhole ring is provided with a matching groove; the adjusting screw has a trapezoidal thread structure with a thread helix angle ≤15°; the end of the adjusting screw that contacts the manhole ring is provided with anti-slip texture; the sealing ring is made of EPDM rubber and its cross-section is trapezoidal wavy; the contact surface between the manhole ring and the sealing ring is provided with an annular guide groove for evenly distributing sealing pressure.

[0005] The beneficial effects of this utility model are: 1. Improved resistance to drift: The rectangular distribution of adjusting screws and the limiting groove of the manhole ring form a four-point dynamic pressure compensation mechanism, which can offset the pressure fluctuation (≥0.8MPa) and thermal expansion and contraction deformation (temperature difference ≥80℃) in the tank in real time; the anti-slip texture at the end combined with the trapezoidal thread greatly improves the self-locking property of the thread. 2. Efficient single-person operation: The support rod, combined with the manually screwed structure of the wing nut, enables a "lever-style" effortless opening and closing operation. Only one hand is needed to rotate the wing nut to complete the operation. The adjusting screws can also be rotated individually. The rotating connection design between the connecting rod and the tank body allows the manhole cover to open and close along a fixed trajectory, avoiding the alignment deviation problem of traditional hanging cover structures.

[0006] 3. Optimized sealing performance: The trapezoidal corrugated section EPDM rubber sealing ring and the annular guide groove work together to achieve a sealing pressure distribution uniformity of 95%. Attached Figure Description

[0007] The present invention will now be described in further detail with reference to the accompanying drawings.

[0008] Figure 1 This is a schematic diagram of the structure of this utility model.

[0009] Figure 2 This is a front view schematic diagram of this utility model.

[0010] The figure shows: 1-Manhole ring; 2-Manhole cover; 3-Connecting rod; 31-Rotating shaft; 4-Support rod; 41-Wing nut; 5-Adjusting screw; 51-Mounting block. Detailed Implementation

[0011] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0012] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the scope of this invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should still fall within the scope of the technical content disclosed herein. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0013] In the description of this utility model, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" or "linked" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. It should be noted that the terms "comprising," "including," or any other variations are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0014] like Figure 1 , Figure 2 The stainless steel manhole cover anti-offset adjustment device for a liquid storage tank shown includes a manhole ring 1, a manhole cover 2, a connecting rod 3, a rotating shaft 31, a support rod 4, a wing nut 41, an adjusting screw 5, a mounting block 51, and a sealing ring.

[0015] The manhole ring 1 is a conventional circular hole used as an entrance and exit for operators to enter the tank. The manhole ring 1 has an annular edge and the inner wall of the manhole ring 1 has a limiting groove that matches the adjusting screw 5.

[0016] The manhole cover 2 is a manhole cover 2 whose shape matches that of the manhole ring 1.

[0017] The support rod 4 is vertically installed on the manhole cover 2 via a lead screw. The length of the support rod 4 is greater than the diameter of the manhole ring 1. In order to make the manhole cover 2 more stable, the support rod 4 and the manhole ring 1 are provided with matching grooves.

[0018] The wing nut 41 is installed on the lead screw above the support rod 4, pressing the support rod 4 onto the annular edge of the manhole ring 1, and is used to fix the manhole cover 2 onto the manhole ring 1.

[0019] One end of the connecting rod 3 is rotatably connected to the storage tank tube via a rotating shaft 31, and the other end is connected to the manhole cover 2, which is used to open and close the manhole cover 2 along a set trajectory to avoid misalignment with the manhole ring 1.

[0020] The mounting block 51 is symmetrically welded at both ends along the central axis of the upper surface of the manhole cover 2.

[0021] The adjusting screw 5 is threaded onto the mounting block 51; the adjusting screw 5 is rectangular in shape; to enhance self-locking, the adjusting screw 5 has a trapezoidal thread structure with a thread helix angle ≤15°, and the end of the adjusting screw 2 that contacts the manhole ring 1 is provided with anti-slip texture.

[0022] The sealing ring is embedded between the contact surfaces of the manhole cover 2 and the manhole ring 1; the sealing ring is made of EPDM rubber and its cross-section is trapezoidal and wavy; the contact surface between the manhole ring 1 and the sealing ring is provided with an annular guide groove for uniformly distributing the sealing pressure.

[0023] Installation steps of this utility model: Observe whether the manhole ring 1 is in normal condition and whether there is any skewness in the manhole ring 1. The operator holds the manhole cover 2 handle with both hands and puts the manhole cover 2 into the manhole ring 1. Attach the support rod 4 to the manhole ring 1. Hold the manhole cover 2 with your right hand and adjust the position of the sealing ring by rotating the four adjusting screws 5 on the left side. After adjustment, attach the outer end of the support rod to the edge of the manhole and tighten the wing nut 41.

[0024] The scope of protection of this utility model is not limited to the technical solutions disclosed in the specific embodiments. Any modifications, equivalent substitutions, improvements, etc., made to the above embodiments based on the technical essence of this utility model shall fall within the scope of protection of this utility model.

Claims

1. A stainless steel manhole cover anti-offset adjustment device for a liquid storage tank, comprising a manhole ring (1) with an annular edge, a manhole cover (2) matching the manhole ring (1), a connecting rod (3), a support rod (4), and a wing nut (41); the support rod (4) is vertically mounted on the manhole cover (2) via a screw; the wing nut (41) is mounted on the screw above the support rod (4); one end of the connecting rod (3) is rotatably connected to the storage tank body via a rotating shaft (31), and the other end is connected to the manhole cover (2); characterized in that: It also includes an adjusting screw (5), a mounting block (51) and a sealing ring; four sets of mounting blocks (51) are symmetrically welded at both ends of the central axis on the upper surface of the manhole cover (2); the adjusting screw (5) is threaded onto the mounting block (51); the adjusting screw (5) is rectangularly distributed; the sealing ring is embedded between the contact surface of the manhole cover (2) and the manhole ring (1); the length of the support rod (4) is greater than the diameter of the manhole ring (1).

2. The anti-offset adjustment device for a stainless steel manhole cover of a liquid storage tank according to claim 1, characterized in that: The inner wall of the manhole ring (1) is provided with a limiting groove that matches the adjusting screw (5).

3. The anti-offset adjustment device for a stainless steel manhole cover of a liquid storage tank according to claim 1, characterized in that: The support rod (4) has a matching groove on the contact surface with the manhole ring (1).

4. The anti-offset adjustment device for a stainless steel manhole cover of a liquid storage tank according to claim 1, characterized in that: The adjusting screw (5) has a trapezoidal thread structure with a thread helix angle ≤15°.

5. The anti-offset adjustment device for a stainless steel manhole cover of a liquid storage tank according to claim 1, characterized in that: The end of the adjusting screw (5) that contacts the manhole ring (1) is provided with anti-slip texture.

6. The anti-offset adjustment device for a stainless steel manhole cover of a liquid storage tank according to claim 1, characterized in that: The sealing ring is made of EPDM rubber and has a trapezoidal wavy cross section; the manhole ring (1) has an annular guide groove on the contact surface with the sealing ring to evenly distribute the sealing pressure.

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