O-ring and retainer assembly device and assembly method

Abstract

The application provides an assembly device and method for O-rings and check rings in a hole, which comprises a feeding positioning mechanism, a pressing mechanism and a guide cylinder. The guide cylinder is used for being inserted into the feeding positioning mechanism and the pressing mechanism, and simultaneously being inserted into an assembly hole of a component to be assembled as a carrier. The feeding positioning mechanism is used for transporting O-rings and check rings to a sealing ring groove of the component to be assembled through the guide cylinder. The pressing mechanism is used for cooperating with the feeding mechanism after being inserted into the guide cylinder, and assembling the O-rings and the check rings into the sealing ring groove. The assembly device and method for O-rings and check rings in a hole improve the assembly efficiency, ensure the assembly position relationship of the O-rings and the check rings, and avoid the problems of misassembly, missed assembly and rework caused by manual assembly.

Description

Technical Field

[0001] This invention belongs to the field of sealing technology, and in particular relates to an assembly device and assembly method for an assembly of O-rings and retaining rings in a hole. Background Technology

[0002] In the field of hydraulic component assembly, the assembly of O-rings and retaining rings within bores is involved. In related technologies, the assembly method within bores is mainly manual, one-by-one assembly in sequence. Due to the limited space within the bore, this process is not only inefficient but also prone to errors in sequence or assembly failure. During disassembly and maintenance, the O-rings and retaining rings are often damaged or deformed upon removal, rendering them unusable and increasing economic costs. Some related technologies allow for the assembly of O-rings using a device. The main method involves using grippers to deform the O-ring, causing it to indent inwards. After the O-ring is moved into the sealing groove, the grippers remove it, and the O-ring returns to its original shape, completing the assembly. However, because retaining rings are made of harder material, they cannot undergo the same deformation as O-rings. Therefore, it is impossible to use the same gripper device to assemble retaining rings, let alone assemble O-rings and retaining rings in groups. Summary of the Invention

[0003] In view of this, the present invention aims to provide an assembly device for O-rings and retaining rings in a hole, so as to solve the problems of low assembly efficiency and easy damage during the assembly of O-rings and retaining rings.

[0004] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0005] An assembly device for assembling O-rings and retaining rings in a hole includes a feeding and positioning mechanism, a pressing mechanism, and a guide cylinder. The guide cylinder is used to insert into the feeding and positioning mechanism and the pressing mechanism, and also serves as a carrier to be inserted into the assembly hole of the part to be assembled. The feeding and positioning mechanism transports the O-rings and retaining rings to the sealing ring groove of the part to be assembled by inserting the guide cylinder. The pressing mechanism, after being inserted into the guide cylinder, cooperates with the feeding mechanism to assemble the O-rings and retaining rings into the sealing ring groove.

[0006] Furthermore, the feeding and positioning mechanism includes an upper feeding part, a middle feeding part, and a lower feeding part. The upper feeding part and the middle feeding part are both semi-cylindrical structures. The outer diameter of the upper feeding part is larger than the outer diameter of the middle feeding part, and the junction of the two forms a feeding positioning surface. An annular groove for fitting O-rings and retaining rings is formed between the middle feeding part and the lower feeding part. The lower feeding part is a cylindrical structure.

[0007] Furthermore, the annular groove is a semi-circular annular groove.

[0008] Furthermore, the pressing mechanism includes an integral pressing upper part and a pressing lower part, both of which are semi-cylindrical structures, and the junction of the two forms a pressing positioning surface; the outer diameter of the pressing upper part is larger than the outer diameter of the pressing lower part; the bottom of the pressing lower part is provided with a lower end face.

[0009] Furthermore, the guide cylinder is provided with a guide hole for inserting the feeding positioning mechanism and the pressing mechanism. The top of the inner wall of the guide hole is provided with a No. 2 guide angle, and the bottom of the guide cylinder is provided with a positioning surface step.

[0010] Furthermore, the outer diameter of the middle feeding section is the same as the outer diameter of the lower pressing section, and both are matched with the inner diameter of the guide hole; the outer diameter of the upper feeding section is the same as the outer diameter of the upper pressing section.

[0011] Furthermore, the distance from the middle of the feeding section to the top surface of the lower feeding section is equal to the distance from the upper end of the guide cylinder to the lower end of the sealing ring groove of the part to be installed; the distance from the pressing positioning surface to the lower end of the sealing ring groove of the part to be installed is equal to the distance from the upper end of the guide cylinder to the lower end of the sealing ring groove of the part to be installed.

[0012] Compared with the prior art, the assembly device for assembling O-rings and retaining rings in the hole according to the present invention has the following advantages:

[0013] (1) The assembly device for the O-ring and retaining ring in the hole as described in this invention has a simple structure, improves assembly efficiency, and ensures the assembly position relationship between the O-ring and retaining ring; avoiding the problems of incorrect assembly, omissions and rework caused by manual assembly.

[0014] (2) The assembly device for the O-ring and retaining ring in the hole described in this invention does not involve stretching or compressing the O-ring and retaining ring during the assembly process, which can ensure that the performance and quality of the O-ring and retaining ring are not affected.

[0015] Another objective of this invention is to provide an assembly method for O-rings and retaining rings in a hole, so as to solve the problems of low assembly efficiency and easy damage during the assembly of O-rings and retaining rings.

[0016] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0017] The assembly method for O-rings and retaining rings inside the hole as a group includes the following steps:

[0018] S1. Place the assembly hole of the part to be assembled facing upwards, and place the guide cylinder on the upper part of the assembly hole so that the positioning surface step of the guide cylinder coincides with the bottom surface of the upper part of the assembly hole.

[0019] S2. The O-ring and retaining ring are transported to the sealing ring groove of the part to be assembled by the feeding and positioning mechanism;

[0020] S3. The O-ring and retaining ring are assembled into the sealing ring groove by the pressing mechanism and the feeding mechanism.

[0021] S4. Simultaneously remove the feeding and positioning mechanism, pressing mechanism, and guide cylinder from the assembly hole to complete the assembly.

[0022] Furthermore, the specific method for transporting the O-ring and retaining ring to the sealing ring groove of the part to be installed in S2 is as follows: the O-ring and retaining ring to be installed are placed outside the annular groove of the feeding and positioning mechanism, and the O-ring and retaining ring are pulled upward so that the O-ring and retaining ring can enter the guide hole without interference at the inlet of the guide cylinder. The feeding and positioning mechanism pushes the O-ring and retaining ring downward along the guide hole to the sealing ring groove of the part to be installed until the feeding and positioning surface of the feeding and positioning mechanism coincides with the upper end surface of the guide cylinder.

[0023] Furthermore, the specific method for assembling the O-ring and retaining ring into the sealing ring groove in S3 is as follows: the pressing mechanism is placed into the radial empty end of the guide hole and pushed downward until the lower end face contacts the O-ring and retaining ring. Then, while continuing to push the pressing mechanism downward, the pressing mechanism and the feeding positioning mechanism move circumferentially along the inner wall of the guide cylinder, so that the O-ring and retaining ring are assembled into the sealing ring groove of the part to be assembled under the axial thrust and circumferential movement, until the pressing positioning surface of the pressing mechanism coincides with the upper end face of the guide cylinder.

[0024] The assembly method of the in-hole O-rings and retaining rings as a group has the same advantages as the above-mentioned assembly device of the in-hole O-rings and retaining rings as the prior art, and will not be repeated here. Attached Figure Description

[0025] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0026] Figure 1 This is a schematic diagram of the assembly device for the O-ring and retaining ring assembly in the hole according to an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the feeding and positioning mechanism according to an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the pressing mechanism described in an embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the accessory to be assembled according to an embodiment of the present invention.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1-Feeding and positioning mechanism; 11-Upper feeding part; 12-Middle feeding part; 13-Feeding positioning surface; 14-Annular groove; 15-Guide angle 1; 16-Lower feeding part; 2-Pressure fitting mechanism; 21-Upper pressure fitting part; 22-Lower pressure fitting part; 23-Lower end face; 24-Pressure fitting positioning surface; 25-Rounded corner; 3-Guide cylinder; 31-Guide hole; 32-Guide angle 2; 33-Positioning surface step. Detailed Implementation

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0033] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0036] Definitions:

[0037] Assembly to be assembled: The assembly to be assembled is provided with an assembly hole, the assembly hole having a relatively defined upper part and a lower part along its axial direction, and a sealing ring groove is provided between the upper part and the lower part.

[0038] Assembly devices for grouped O-rings and retaining rings inside holes, such as... Figures 1 to 3 As shown, it includes a feeding and positioning mechanism 1, a pressing mechanism 2, and a guide cylinder 3.

[0039] The guide cylinder 3, as a carrier, is inserted into the assembly hole of the part to be assembled. The guide hole is provided for inserting the feeding and positioning mechanism 1 and the pressing mechanism 2.

[0040] The feeding and positioning mechanism 1 transports the O-ring and retaining ring to the sealing ring groove of the part to be assembled by inserting the guide cylinder 3;

[0041] The pressing mechanism 2, after cooperating with the feeding mechanism 1, moves circumferentially along the inner wall of the guide cylinder 3 to assemble the O-ring and retaining ring into the sealing ring groove.

[0042] Preferably, the feeding and positioning mechanism 1 is an integral structure. The feeding and positioning mechanism 1 includes an upper feeding part 11, a middle feeding part 12, and a lower feeding part 16. The upper feeding part 11 and the middle feeding part 12 are both semi-cylindrical structures, and their outer diameters are different. A stepped surface is formed at their junction. In one or more embodiments, the outer diameter of the upper feeding part 11 is larger than the outer diameter of the middle feeding part 12, and a feeding positioning surface 13 is formed at their junction. An annular groove 14 is formed between the middle feeding part 12 and the lower feeding part 16, and the lower feeding part 16 is a cylindrical structure.

[0043] To ensure that the O-ring and retaining ring can be smoothly squeezed into the sealing ring groove of the part Z to be assembled when the pressing mechanism 2 performs the squeezing action during the assembly process, a guide angle 15 is formed below the feeding center 12.

[0044] The annular groove 14 is a semi-circular annular groove.

[0045] Preferably, the pressing mechanism 2 is an integral structure. The pressing mechanism 2 includes an integral pressing upper part 21 and a pressing lower part 22, both of which are semi-cylindrical structures, and the junction of the two forms a pressing positioning surface 24; the outer diameter of the pressing upper part 21 is larger than the outer diameter of the pressing lower part 22; the bottom of the pressing lower part 22 is provided with a lower end face 23; to avoid damage to the O-ring and retaining ring during assembly, a rounded corner 25 is formed between the lower end face 23 and the outer shell of the pressing lower part 22.

[0046] In one or more embodiments, both the upper press-fit portion 21 and the lower press-fit portion 22 are hollow semi-cylindrical structures.

[0047] To increase friction, knurling is provided on the arc surface of the upper feeding part 11 and the arc surface of the upper pressing part 21.

[0048] Both the feeding and positioning mechanism 1 and the pressing mechanism 2 are integrally formed. After forming, they are cut along the axis according to the structural requirements, and the cut surface is perpendicular to the end face.

[0049] The guide cylinder 3 has a guide hole 31 inside, and a second guide angle 32 is provided at the top of the inner wall of the guide hole. The second guide angle 32 is used to guide the O-ring and retaining ring during installation. The outer wall structure of the guide cylinder 3 is adapted to the structure of the upper part of the assembly hole, and is provided with a positioning surface step 33 that matches the structure of the assembly hole. Preferably, the guide hole 31 is a cylindrical through hole, which guides the feeding positioning mechanism 1 and the pressing mechanism 2 to ensure that the O-ring, retaining ring and the sealing ring groove on the part are coaxial.

[0050] The outer diameter of the feeding middle section 12 is the same as the outer diameter of the pressing lower section 22, and both match the inner diameter of the guide hole 31. This ensures that during assembly, when the feeding upper section 11 and the pressing upper section 21 are inserted into the guide hole 31, the cylindrical shape formed by the outer diameter of the feeding middle section 12 and the pressing lower section 22 after contact can fit snugly against the inner diameter of the guide hole 31. The outer diameter of the feeding upper section 11 is the same as the outer diameter of the pressing upper section 21. The distance from the feeding middle section 12 to the top surface of the feeding lower section 16 is equal to the distance from the upper end of the guide cylinder 3 to the lower end of the sealing ring groove of the part to be assembled. The distance from the pressing positioning surface 24 to the lower end of the sealing ring groove of the part to be assembled is equal to the distance from the upper end of the guide cylinder 3 to the lower end of the sealing ring groove of the part to be assembled.

[0051] like Figures 1 to 4 As shown, for ease of description and understanding, the O-ring is marked as X, the retaining ring as Y, and the part to be installed as Z. The sealing ring groove of the part to be installed Z needs to be fitted with both the O-ring X and the retaining ring Y.

[0052] The assembly method for O-rings and retaining rings inside the hole as a group includes the following steps:

[0053] S1. Place the assembly hole of the part Z to be assembled facing upward on the mounting table, and manually place the guide cylinder 3 from top to bottom along the axial direction into the upper part of the assembly hole of the part Z to be assembled. The positioning surface step 33 of the guide cylinder 3 coincides with the bottom surface of the upper part of the assembly hole of the part Z to be assembled.

[0054] S2. Place the O-ring X and retaining ring Y to be installed on the outside of the annular groove 14 of the feeding and positioning mechanism 1 according to the assembly position requirements. Manually assist in lifting a part of the O-ring X and retaining ring Y upward along the feeding upper part 11 of the feeding and positioning mechanism 1. At this time, the O-ring X and retaining ring Y change from a circular ring to an elliptical ring. This action allows the O-ring and retaining ring to enter the guide hole 31 without interference at the inlet of the guide cylinder 3. The feeding and positioning mechanism 1 pushes the O-ring X and retaining ring Y downward along the guide hole 31 to the sealing ring groove of the part Z to be installed, until the feeding and positioning surface 13 of the feeding and positioning mechanism 1 and the upper end surface of the guide cylinder 3 are completely overlapped.

[0055] S3. Manually insert the pressing mechanism 2 into the radial empty end of the guide hole 31 and push it axially from top to bottom into the sealing ring groove until the lower end face 23 contacts the O-ring X and the retaining ring Y. Then, while continuing to push the pressing mechanism 2 downward, move the pressing mechanism 2 and the feeding positioning mechanism 1 circumferentially along the inner wall of the guide cylinder 3 so that the O-ring X and the retaining ring Y can be easily moved into the sealing ring groove of the part Z to be installed under the axial thrust and circumferential movement. After the pressing mechanism 2 is moved axially until the pressing positioning surface 24 coincides with the upper end face of the guide cylinder 3, the O-ring X and the retaining ring Y are assembled into the sealing ring groove of the part Z to be installed.

[0056] S4. Simultaneously remove the feeding and positioning mechanism 1, the pressing mechanism 2, and the guide cylinder 3 from the assembly hole along the axial direction to complete the assembly.

[0057] 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 device for assembling groups of O-rings and retaining rings in a bore, characterized in that: Includes a feeding and positioning mechanism, a pressing mechanism, and a guide tube. The guide tube is used to insert into the feeding and positioning mechanism and the pressing mechanism, and at the same time serves as a carrier to insert into the assembly hole of the part to be assembled. The feeding and positioning mechanism transports the O-rings and retaining rings to the sealing ring groove of the parts to be assembled by inserting a guide tube; The pressing mechanism, after being inserted into the guide tube, cooperates with the feeding mechanism to assemble the O-ring and retaining ring into the sealing ring groove; The feeding and positioning mechanism includes an upper feeding part, a middle feeding part, and a lower feeding part. The upper feeding part and the middle feeding part are both semi-cylindrical structures. The outer diameter of the upper feeding part is larger than the outer diameter of the middle feeding part, and the junction of the two forms a feeding positioning surface. An annular groove for fitting O-rings and retaining rings is formed between the middle feeding part and the lower feeding part. The lower feeding part is a cylindrical structure. The annular groove is a semi-circular annular groove; The pressing mechanism includes an integral pressing upper part and a pressing lower part, both of which are semi-cylindrical structures, and their junction forms a pressing positioning surface; the outer diameter of the pressing upper part is larger than the outer diameter of the pressing lower part; the bottom of the pressing lower part is provided with a lower end face. The guide cylinder has a guide hole inside for inserting the feeding positioning mechanism and the pressing mechanism. The top of the inner wall of the guide hole is provided with a No. 2 guide angle, and the bottom of the guide cylinder is provided with a positioning surface step. The outer diameter of the middle feeding section is the same as the outer diameter of the lower pressing section, and both match the inner diameter of the guide hole. The outer diameter of the upper feeding section is the same as the outer diameter of the upper pressing section.

2. The assembly device for assembling O-rings and retaining rings in the hole according to claim 1, characterized in that: The distance from the middle of the feeding section to the bottom surface of the feeding section is equal to the distance from the upper end of the guide cylinder to the lower end of the sealing ring groove of the part to be installed; the distance from the pressing positioning surface to the lower end of the sealing ring groove of the part to be installed is equal to the distance from the upper end of the guide cylinder to the lower end of the sealing ring groove of the part to be installed.

3. A method for assembling O-rings and retaining rings in a group, characterized in that: Includes the following steps: S1. Place the assembly hole of the part to be assembled facing upwards, and place the guide cylinder on the upper part of the assembly hole so that the positioning surface step of the guide cylinder coincides with the bottom surface of the upper part of the assembly hole. S2. The O-ring and retaining ring are transported to the sealing ring groove of the part to be assembled by the feeding and positioning mechanism; S3. The O-ring and retaining ring are assembled into the sealing ring groove by the pressing mechanism and the feeding mechanism. S4. Simultaneously remove the feeding and positioning mechanism, pressing mechanism, and guide cylinder from the assembly hole to complete the assembly. The specific method for transporting the O-ring and retaining ring to the sealing ring groove of the part to be installed in S2 is as follows: the O-ring and retaining ring to be installed are placed outside the annular groove of the feeding and positioning mechanism, and the O-ring and retaining ring are pulled upward so that the O-ring and retaining ring can enter the guide hole without interference at the inlet of the guide cylinder. The feeding and positioning mechanism pushes the O-ring and retaining ring downward along the guide hole to the sealing ring groove of the part to be installed until the lower part of the feeding mechanism and the positioning surface step are completely overlapped. The specific method for assembling the O-ring and retaining ring into the sealing ring groove in S3 is as follows: the pressing mechanism is placed into the radial empty end of the guide hole and pushed downward until the lower end face contacts the O-ring and retaining ring. Then, while continuing to push the pressing mechanism downward, the pressing mechanism and the feeding positioning mechanism move circumferentially along the inner wall of the guide cylinder, so that the O-ring and retaining ring are assembled into the sealing ring groove of the part to be assembled under the axial thrust and circumferential movement, until the pressing positioning surface of the pressing mechanism coincides with the upper end face of the guide cylinder.

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