Method and device for installing a rubber seal ring without damaging it

Abstract

The application provides a kind of anti-damage installation method and installation device of shaft rubber sealing ring, and the installation device includes two identical shape half shells, two half shells can be opened and closed around hinge shaft, and two half shells form a cylinder when closed, the inner diameter of installation end cylinder mouth is equal to or slightly smaller than the corresponding installation groove top diameter of shaft parts, the outer diameter of the other end cylinder mouth is smaller than the inner ring diameter of rubber sealing ring in natural state, the outer diameter of the cylinder gradually increases from the guide end cylinder mouth and the installation end cylinder mouth to the maximum part of the middle outer diameter, and the axial distance from the maximum part of the middle outer diameter to the installation end cylinder mouth should be equal to the axial length between the corresponding sealing ring installation groove of shaft parts and the installation end of shaft parts, and the inner diameter of the maximum part of the middle outer diameter should be larger than the outer diameter of the installation end of shaft parts. The application has very good protection effect on the shaft installation of rubber sealing ring of shaft parts, and effectively prevents the damage of sealing ring during assembly process.

Description

Technical Field

[0001] This invention relates to the field of sealing ring installation technology, and in particular to a method and device for preventing damage during the installation of shaft-mounted rubber sealing rings. Background Technology

[0002] Rubber sealing rings are widely used in the sealing interfaces of mechanical equipment to ensure the sealing of the equipment's functions and prevent leakage problems such as oil, water, and air during use.

[0003] There are two main common mounting structures for seals on shaft-type parts, such as... Figure 1 As shown, there are two types of installation: in-hole and external. The seal ring's natural state within the mounting groove is generally as follows: for in-hole installation, the outer diameter of the seal ring is approximately the same as the groove top diameter; for external installation, the inner diameter of the seal ring is the same as the groove bottom diameter. Therefore, during installation, in-hole installation is typically done by inserting the rubber seal ring into the mounting groove and then adjusting it to its natural state; for external installation, the rubber seal ring is typically enlarged and then rolled into the mounting groove along the surface of the shaft part.

[0004] For installing rubber sealing rings inside holes, it is generally not easy to damage the sealing rings, because the rubber rings are usually reshaped and inserted into the installation groove, which is generally a direct insertion into the position.

[0005] However, for rubber rings mounted externally on the shaft, the probability of damage to the rubber ring surface during installation is relatively high. This is mainly because external mounting requires increasing the diameter of the rubber ring and rolling it on the external surface of the shaft. During this process, the surface of the rubber ring may be scratched or cut by relatively sharp edges, especially in cases where the mounting groove is far from the mounting end face, such as... Figure 1 The greater the rolling distance of the seal ring A mounted on the outer side of the central shaft, the more easily it is damaged. This is especially true when the outer surface of seal ring A, from the right end face, is entirely threaded. During the rolling installation process, seal ring A continuously rolls along the top edge of the threads, increasing the probability of damage. If seal ring A is damaged and not detected and replaced in time, it can reduce the time required for the equipment's subsequent sealing function, or even cause sealing failure during operation, potentially leading to equipment damage or personal injury. Summary of the Invention

[0006] The purpose of this invention is to design a process and apparatus to assist in the installation of external shaft seals, ensuring that the seals are not scratched or cut by sharp edges of the shaft surface during installation, thereby guaranteeing the reliability of the seal assembly. To achieve the above objective, the specific technical solution of this invention is as follows:

[0007] A damage-resistant installation device for a shaft-mounted rubber seal ring includes two identical half-shells, which are hinged together on opposite sides. The two half-shells can be rotated to open and close around the hinge axis, and when closed, they form a complete cylindrical body.

[0008] Furthermore, among the two ends of the cylindrical body, the opening that encloses the shaft-like parts is defined as the mounting end opening, and the inner diameter of the mounting end opening is equal to or slightly smaller than the top diameter of the corresponding mounting groove of the shaft-like parts.

[0009] Furthermore, the other end of the cylinder is positioned as the guide end cylinder, and the outer diameter of the guide end cylinder is more than 3mm smaller than the inner diameter of the rubber sealing ring to be installed in its natural state.

[0010] Furthermore, the outer diameter of the guide end cylinder opening is smaller than the inner diameter of the mounting end cylinder opening.

[0011] Furthermore, the outer diameter of the cylinder gradually increases from the guide end opening and the mounting end opening to the middle part with the largest outer diameter. The axial distance from the middle part with the largest outer diameter to the mounting end opening should be set to be equal to the axial length between the corresponding sealing ring mounting groove of the shaft part and the mounting end of the shaft part. The inner diameter of the middle part with the largest outer diameter should be 4-5mm larger than the outer diameter of the mounting end of the shaft part.

[0012] Furthermore, the wall thickness of the cylindrical body formed by the installation device should not exceed 2mm.

[0013] Furthermore, the hinge portion located inside the cylinder should not protrude from the inner surface of the semi-shell, and the portion located on the outer side should not protrude more than 2mm from the outer surface of the semi-shell.

[0014] A method for preventing damage during the installation of a shaft-mounted rubber seal ring, characterized by using a damage-prevention installation device for a shaft-mounted rubber seal ring as described above.

[0015] Furthermore, the two half-shells of the mounting device are first flipped and unfolded around the hinge axis. Then, the portion between the corresponding sealing ring mounting groove of the shaft part and the mounting end of the shaft part is placed therein. The two half-shells of the mounting device are then flipped and closed around the hinge axis, thereby wrapping and holding this part of the shaft part within the cylindrical body formed by the mounting device and making it coaxial with it. Next, the rubber sealing ring is fitted onto the cylindrical body from the guide end opening. Finally, the rubber sealing ring is slid and rolled off the cylindrical body to the mounting end opening and then detached. After detachment, it is installed into the corresponding sealing ring mounting groove on the shaft part.

[0016] Furthermore, note that before finally inserting it into the mounting slot, the edge of the mounting end cylinder opening should be aligned with or slightly exceed the edge of the corresponding sealing ring mounting slot of the shaft part.

[0017] The beneficial effects of this invention are:

[0018] A curved rolling surface is designed before the rubber seal ring enters the mounting groove, protecting it from potential damage to the seal ring caused by the surface of the shaft parts during installation. The device employs a two-piece opening and closing mechanism, improving the efficiency of manual operation. This invention provides excellent protection for the external installation of rubber seal rings on shaft parts, effectively preventing damage to the seal ring during assembly. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a common installation structure for rubber seals;

[0020] Figure 2 A schematic diagram showing the locations of seals on shaft-type parts that are easily scratched or cut;

[0021] Figure 3 A three-dimensional view from two perspectives when the installation device is in the open position;

[0022] Figure 4 A three-dimensional schematic diagram of the installation device in the closed state;

[0023] Figure 5 This is a cross-sectional schematic diagram showing the assembly relationship between the mounting device and shaft-type parts in the closed state, as well as the design requirements.

[0024] Figure 6 This is a schematic diagram showing the relationship between the hinge and the outer surface of the mounting device. Detailed Implementation

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0026] In the description of the embodiments of the present invention, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product is usually placed in when in use, or the orientation or positional relationship that is commonly understood by those skilled in the art. It is only for the purpose of facilitating the description of the present invention or simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0027] In this invention, "a plurality of" refers to two or more (including two). The terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0028] Unless otherwise explicitly stated and limited, the terms “set up,” “install,” and “connect” should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection; as a direct connection or an indirect connection through an intermediate medium.

[0029] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] like Figure 3 and Figure 4 As shown, the installation device of the present invention includes two half-shells 1 of the same shape. The two half-shells 1 are hinged to each other on opposite sides by a hinge 2. The two half-shells 1 can be rotated to open and close around the axis of the hinge 2. When closed, the two pairs of opposite sides of the two half-shells 1 are respectively aligned and fitted together to form a complete cylindrical body. Figure 3 The image shown is a perspective view of the open state from two angles. When open, the shaft part 100 can be placed inside; when closed, it can enclose and hold the shaft part 100 tightly. See the closed state image. Figure 4 .

[0031] Furthermore, combined with Figure 5 As shown, the cylindrical openings at both ends of the cylindrical body formed when the mounting device is closed, the openings that enclose the shaft part 100 are defined as the mounting end openings. The inner diameter D1 of the mounting end openings is equal to or slightly smaller than the top diameter d1 of the mounting groove 101 corresponding to the shaft part, so as to ensure that the part can be tightly held when the mounting device is closed.

[0032] The other end of the cylinder is positioned as the guide end cylinder. The outer diameter D2 of the guide end cylinder is more than 3mm smaller than the inner diameter of the sealing ring to be installed in its natural state, so as to ensure that the rubber sealing ring can be put into the guide end cylinder in its natural state, which facilitates rolling assembly.

[0033] Preferably, the outer diameter D2 of the guide end cylinder opening is smaller than the inner diameter D1 of the mounting end cylinder opening;

[0034] The outer diameter of the cylinder gradually increases from the guide end opening and the mounting end opening to the middle part with the largest outer diameter 13. The axial distance L from the middle part with the largest outer diameter 13 to the mounting end opening should be set to be equal to the axial length between the corresponding sealing ring mounting groove of the shaft part 100 and the mounting end 103 of the shaft part. The inner diameter D3 of the middle part with the largest outer diameter 13 should be 4-5mm larger than the outer diameter d2 of the mounting end 103 of the shaft part.

[0035] The wall thickness of the cylindrical body formed by the installation device (i.e., the wall thickness of the semi-shell 1) should not exceed 2mm. The thickness can be further reduced when the material has greater strength.

[0036] All external edges and corners of the installation device must be rounded with a radius of 0.3-0.5mm, or polished or smoothed with abrasive to remove sharp edges and corners, including hinges, to prevent damage to the rubber seals.

[0037] The roughness of the outer surface of the cylindrical body formed by the installation device should be below Ra0.8 to prevent these working surfaces from damaging the rubber seals.

[0038] Hinge 2 can be directly installed using commercially available, mature products (with an opening angle greater than 270°). The dimensional requirements are: the portion of the hinge located inside the cylinder should not protrude from the inner surface of the semi-shell 1; the protrusion height h of the portion located on the outer side of the hinge protruding from the outer surface of the semi-shell 1 should not exceed 2mm. See [link / reference]. Figure 6 .

[0039] External mounting method for rubber seals on shaft-type parts:

[0040] In use, first unfold the two half-shells 1 of the mounting device around the hinge 2 axis, then place the part between the corresponding sealing ring mounting groove of the shaft part 100 and the mounting end 103 of the shaft part into it, and then unfold and close the two half-shells 1 of the mounting device around the hinge 2 axis, thereby wrapping and holding this part of the shaft part 100 in the cylindrical body formed by the mounting device and making it coaxial with it. Then, put the rubber sealing ring into the cylindrical body from the guide end opening of the cylindrical body. Finally, slide the rubber sealing ring from the cylindrical body to the mounting end opening and then remove it. After removal, it is installed into the corresponding sealing ring mounting groove on the shaft part. Note that before finally installing it into the mounting groove, the edge of the mounting end opening should be aligned with or slightly exceed the edge of the corresponding sealing ring mounting groove of the shaft part to avoid the mounting groove edge of the part scratching the rubber sealing ring.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preventing damage during the installation of a shaft-mounted rubber seal, characterized in that, A damage-resistant mounting device using a shaft-mounted rubber seal ring comprises two identical half-shells hinged together on opposite sides. The two half-shells can rotate and open / close around the hinge axis, forming a complete cylindrical body when closed. The opening at each end of the cylindrical body that encloses the shaft-like part is defined as the mounting end opening, with an inner diameter equal to or slightly smaller than the diameter of the corresponding mounting groove top. The other end opening is positioned as the guide end opening. The outer diameter of the guide end cylinder opening is more than 3mm smaller than the inner diameter of the rubber sealing ring to be installed in its natural state; the outer diameter of the guide end cylinder opening is smaller than the inner diameter of the installation end cylinder opening; the outer diameter of the cylinder gradually increases from the guide end cylinder opening and the installation end cylinder opening to the middle part with the largest outer diameter, and the axial distance from the middle part with the largest outer diameter to the installation end cylinder opening should be set to be equal to the axial length between the corresponding sealing ring mounting groove of the shaft part and the installation end of the shaft part, and the inner diameter of the middle part with the largest outer diameter should be 4-5mm larger than the outer diameter of the installation end of the shaft part; First, unfold the two half-shells of the mounting device around the hinge axis. Then, place the part between the corresponding sealing ring mounting groove of the shaft part and the mounting end of the shaft part into it. Flip the two half-shells of the mounting device around the hinge axis to close them, thereby wrapping and holding this part of the shaft part in the cylindrical body formed by the mounting device and making it coaxial with it. Then, put the rubber sealing ring into the cylindrical body from the guide end opening of the cylindrical body. Finally, slide the rubber sealing ring from the cylindrical body to the mounting end opening and then remove it. After removal, it is installed into the corresponding sealing ring mounting groove on the shaft part. The wall thickness of the cylindrical body formed by the installation device should not exceed 2mm; The hinge portion located inside the cylinder should not protrude from the inner surface of the semi-shell, and the portion located on the outer side should not protrude more than 2mm from the outer surface of the semi-shell.

2. The anti-damage installation method for a shaft-mounted rubber seal ring as described in claim 1, characterized in that, Note that before finally inserting it into the mounting slot, the edge of the mounting end cylinder opening should be aligned with or slightly exceed the edge of the corresponding sealing ring mounting slot of the shaft part.

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