Shaft part O-shaped ring assembly auxiliary device and using method

Abstract

The invention provides a shaft type part O-shaped ring assembling auxiliary device and a using method, and the device comprises a guide head which is provided with a guide head cylindrical section, a guide head conical column large end and a guide head conical column small end; the mounting sleeve is provided with an exhaust hole and a small cylindrical section of the mounting sleeve; the outer diameter of the cylindrical section of the guide head is smaller than the inner diameter of the exhaust hole, so that movable connection between the guide head and the mounting sleeve is realized; the outer diameter of the large end of the conical column of the guide head is the same as that of the small cylindrical section of the mounting sleeve, and the guide head is used for transferring the O-shaped ring of the shaft part from the guide head to the small cylindrical section of the mounting sleeve; the outer diameter of the small end of the conical column of the guide head is smaller than the inner diameter of the shaft type part O-shaped ring, and the guide head is used for guiding the shaft type part O-shaped ring to slide, expand and transfer to the small cylindrical section of the installation sleeve along the guide head. When the O-shaped ring on the shaft type part is assembled, especially when the shaft is long and provided with a plurality of O-shaped ring grooves, assembling can be easily achieved at any position on the shaft, it is guaranteed that the structure of the O-shaped ring is intact, and the assembling quality is improved.

Description

Technical Field

[0001] The present invention relates to the field of sealing technology, and in particular to an auxiliary device for assembling an O-ring of a shaft-shaped part and a method for using the same. Background Art

[0002] O-rings are widely used in the sealing field. For shaft-shaped parts, multiple O-rings are often redundantly connected in series to ensure their sealing performance. The traditional method of using bare hands or tools to expand the O-ring before assembly can easily cause partial twisting of the O-ring, surface scratches, and reduce assembly quality. Under the premise of ensuring the assembly quality of the O-ring, designing a lightweight and easy-to-operate assembly auxiliary device is the main design difficulty.

[0003] Conical guide elements have been used to install sealing rings on shafts. For example, patent document CN205799356U discloses a most common sealing ring installation device, which uses a conical guide element to expand the sealing ring and then put it on the shaft-shaped part to achieve the installation of the sealing ring. However, its versatility is general and it is also impossible to achieve the assembly of O-rings at a long distance on a long shaft-shaped part, especially when redundant O-rings are arranged in series on the shaft-shaped part. Summary of the invention

[0004] In view of the defects in the prior art, the object of the present invention is to provide an auxiliary device for assembling an O-ring of a shaft-shaped part and a method for using the same.

[0005] The shaft-shaped O-ring assembly auxiliary device provided by the present invention comprises:

[0006] The guide head is provided with a guide head cylindrical section, a guide head cone column large end and a guide head cone column small end;

[0007] An installation sleeve is provided with an exhaust hole and a small cylindrical section of the installation sleeve;

[0008] The outer diameter of the cylindrical section of the guide head is smaller than the inner diameter of the exhaust hole, so as to realize a flexible connection between the guide head and the mounting sleeve;

[0009] The outer diameter of the large end of the guide head cone is the same as the outer diameter of the small cylindrical section of the mounting sleeve, and is used for transferring the shaft-shaped O-ring from the guide head to the small cylindrical section of the mounting sleeve;

[0010] The outer diameter of the small end of the guide head cone column is smaller than the inner diameter of the shaft-shaped O-ring, and is used to guide the shaft-shaped O-ring to slide and expand along the guide head and transfer to the small cylindrical section of the installation sleeve.

[0011] Preferably, an inlet chamfer is provided on the small cylindrical section of the mounting sleeve to avoid scratching the O-ring of the shaft-shaped part during assembly.

[0012] Preferably, the guide head and the mounting sleeve are made of polypropylene.

[0013] Preferably, the surface roughness of the cone column of the guide head is better than Ra3.2, and the outer surface roughness of the small cylindrical section of the mounting sleeve is also better than Ra3.2.

[0014] Preferably, the inner diameter of the exhaust hole is larger than the outer diameter of the target shaft to facilitate installation of the guide and exhaust of compressed gas.

[0015] Preferably, a large cylindrical section of the mounting sleeve is provided on the mounting sleeve, the outer diameter of the large cylindrical section of the mounting sleeve is 1.2 times the inner diameter of the exhaust hole, and the axial width of the large cylindrical section of the mounting sleeve is 1.1 to 1.5 times the inner diameter of the O-ring of the shaft-shaped part, serving as the installation location for the transfer transition of the O-ring of the shaft-shaped part.

[0016] Preferably, the inner diameter of the mounting sleeve is larger than the diameter of the target shaft, so that the shaft-shaped O-ring can be assembled to any position of the target shaft without damage.

[0017] The method for using the shaft-shaped O-ring assembly auxiliary device provided by the present invention comprises the following steps:

[0018] Step 1: Insert the shaft O-ring from the small end of the guide head cone column and slide it along the guide head to expand;

[0019] Step 2: Assemble the shaft O-ring onto the small cylindrical section of the mounting sleeve;

[0020] Step 3: Remove the guide head;

[0021] Step 4: Put the installation sleeve with the shaft-shaped O-ring on the target shaft and move it to the specified position;

[0022] Step 5: Assemble the shaft-shaped O-ring into the groove where it needs to be installed, thereby completing the non-destructive assembly of the shaft-shaped O-ring at any position on the target shaft.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] (1) High assembly quality and efficiency: After the O-ring is greased, it is inserted from the small end of the guide head, slowly rolled and evenly expanded to the assembly sleeve. The guide head is removed, and the installation sleeve together with the O-ring is put on the shaft and moved to the desired installation position. The O-ring is then rolled into the installation groove. The O-ring changes evenly throughout the whole process without twisting or scratching. Currently, a 100% qualified rate for one-time assembly can be achieved.

[0025] (2) Good versatility: As long as the inner diameter of the installation sleeve is slightly larger than the shaft to be installed, the O-ring can be installed at any position on the shaft.

[0026] (3) Simple and reliable structure: The structure is simple, easy to process, and the guide head and installation sleeve are easy to disassemble and assemble, meeting the requirements of lightness and miniaturization.

[0027] (4) It has the advantage of convenient disassembly and assembly of tandem O-rings: the installation sleeve is provided with exhaust holes and inlet chamfers, which can meet the installation function of the O-rings at the far end of the shaft-shaped part. For tandem O-rings, if one O-ring fails, it can be replaced without affecting other O-rings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0029] Figure 1 It is a structural schematic diagram of an O-ring assembly auxiliary device on a shaft-shaped member of the present invention;

[0030] Figure 2 This is a partial enlarged view of the chamfer of the installation sleeve entrance;

[0031] Figure 3 This is a schematic diagram of installing the O-ring to the tooling;

[0032] Figure 4 Schematic diagram of installing the O-ring on the shaft member with the O-ring sleeve after removing the guide head. DETAILED DESCRIPTION

[0033] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0034] Example

[0035] like Figure 1 , is a schematic structural diagram of an O-ring assembly auxiliary device on a shaft-shaped part of the present invention, comprising a guide head 1 and a mounting sleeve 2.

[0036] The guide head 1 and the mounting sleeve 2 are both formed by lathe machining and are made of polystyrene.

[0037] The guide head 1 is provided with a guide head cylindrical section 101, a guide head cone column large end 102 and a guide head cone column small end 103;

[0038] The installation sleeve 2 is provided with an exhaust hole 201 and a small cylindrical section 204 of the installation sleeve;

[0039] The outer diameter of the guide head cylindrical section 101 is smaller than the inner diameter of the exhaust hole 201, so as to realize a flexible connection between the guide head 1 and the mounting sleeve 2;

[0040] The outer diameter of the large end 102 of the guide head cone is the same as the outer diameter of the small cylindrical section 204 of the mounting sleeve, and is used for transferring the shaft-shaped O-ring from the guide head 1 to the small cylindrical section of the mounting sleeve 2;

[0041] The outer diameter of the small end 103 of the guide head cone is smaller than the inner diameter of the shaft-shaped O-ring, and is used to guide the shaft-shaped O-ring to slide and expand along the guide head 1 and transfer to the small cylindrical section 204 of the mounting sleeve.

[0042] The small cylindrical section 204 of the mounting sleeve is provided with an inlet chamfer 202, and a 30° chamfer and a smooth transition at the root are recommended to avoid collisions between the guide head 1 and the shaft during installation, and to effectively prevent scratches on the O-ring, especially when the O-rings are installed in series.

[0043] The surface roughness of the cone column of the guide head 1 is better than Ra3.2, and the outer surface roughness of the small cylindrical section 204 of the mounting sleeve is also better than Ra3.2.

[0044] The inner diameter of the exhaust hole 201 is larger than the outer diameter of the target shaft, so as to facilitate installation of the guide and exhaust of compressed gas.

[0045] The mounting sleeve 2 is provided with a large cylindrical section 203 of the mounting sleeve, the outer diameter of the large cylindrical section 203 of the mounting sleeve is 1.2 times the inner diameter of the exhaust hole 201, and the axial width of the large cylindrical section 203 of the mounting sleeve is 1.1 to 1.5 times the inner diameter of the O-ring of the shaft-shaped part, serving as the installation location for the transfer transition of the O-ring of the shaft-shaped part.

[0046] The inner diameter of the installation sleeve 2 is larger than the diameter of the target shaft, so that the shaft-shaped O-ring can be assembled to any position of the target shaft without damage.

[0047] The inner diameter of the exhaust hole 201 can be set to be slightly larger than the mounting shaft object, and can be used for exhausting the serial O-ring during the disassembly and assembly process.

[0048] The specific assembly method of the O-ring is as follows:

[0049] The first step is to prepare the guide head 1 and the mounting sleeve 2, and assemble the two parts together;

[0050] Step 2: Apply a layer of grease on the O-ring;

[0051] The third step is to insert the O-ring from the small end 103 of the cone column of the guide head, and slowly slide it to the root of the small cylindrical section 204 of the installation sleeve, and use the diameter difference between the two ends of the guide head 1 to expand the O-ring;

[0052] Step 4: Remove the guide head 1 from the mounting sleeve 2;

[0053] Step 5: Insert the installation sleeve 2 together with the O-ring onto the target shaft, and move the installation sleeve 2 to the groove where the O-ring needs to be installed;

[0054] Step 6: Slide the O-ring from the root of the small cylindrical section 204 of the installation sleeve into the groove on the shaft, remove the installation sleeve 2, and complete the assembly.

[0055] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0056] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A shaft-shaped O-ring assembly auxiliary device, characterized in that: include: A guide head (1) is provided with a guide head cylindrical section (101), a guide head cone column large end (102) and a guide head cone column small end (103); A mounting sleeve (2) having an exhaust hole (201) and a small cylindrical section (204) of the mounting sleeve; The outer diameter of the guide head cylindrical section (101) is smaller than the inner diameter of the exhaust hole (201), thereby achieving a flexible connection between the guide head (1) and the mounting sleeve (2); The outer diameter of the large end (102) of the guide head cone is the same as the outer diameter of the small cylindrical section (204) of the mounting sleeve, and is used for transferring the O-ring of the shaft-shaped part from the guide head (1) to the small cylindrical section of the mounting sleeve (2); The outer diameter of the small end (103) of the guide head cone column is smaller than the inner diameter of the shaft-shaped O-ring and is used to guide the shaft-shaped O-ring to slide and expand along the guide head (1) and transfer to the small cylindrical section (204) of the mounting sleeve.

2. The shaft-shaped O-ring assembly auxiliary device according to claim 1, characterized in that: The small cylindrical section (204) of the installation sleeve is provided with an inlet chamfer (202) to avoid scratching the O-ring of the shaft-shaped part during the assembly process.

3. The shaft-shaped O-ring assembly auxiliary device according to claim 1, characterized in that: The guide head (1) and the mounting sleeve (2) are made of polypropylene.

4. The shaft-shaped O-ring assembly auxiliary device according to claim 1, characterized in that: The roughness of the conical surface of the guide head (1) is better than Ra3.2, and the roughness of the outer surface of the small cylindrical section (204) of the mounting sleeve is also better than Ra3.

2.

5. The shaft-shaped component O-ring assembly auxiliary device according to claim 1, characterized in that: The inner diameter of the exhaust hole (201) is larger than the outer diameter of the target shaft, so as to facilitate installation of the guide and exhaust of compressed gas.

6. The shaft-shaped component O-ring assembly auxiliary device according to claim 1, characterized in that: The mounting sleeve (2) is provided with a large cylindrical section (203) of the mounting sleeve, the outer diameter of the large cylindrical section (203) of the mounting sleeve is 1.2 times the inner diameter of the exhaust hole (201), and the axial width of the large cylindrical section (203) of the mounting sleeve is 1.1 to 1.5 times the inner diameter of the O-ring of the shaft-shaped part, serving as an installation location for the transfer transition of the O-ring of the shaft-shaped part.

7. The shaft-shaped component O-ring assembly auxiliary device according to claim 1, characterized in that: The inner diameter of the installation sleeve (2) is larger than the diameter of the target shaft, so that the shaft-shaped O-ring can be assembled to any position of the target shaft without damage.

8. A method for using the shaft-shaped component O-ring assembly auxiliary device according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1: Insert the shaft-shaped O-ring from the small end (103) of the guide head cone column, and slide it along the guide head (1) to expand; Step 2: Assemble the shaft-shaped O-ring onto the small cylindrical section (204) of the mounting sleeve; Step 3: Remove the guide head (1); Step 4: Put the installation sleeve (2) with the shaft-shaped O-ring on the target shaft and move it to the specified position; Step 5: Assemble the shaft-shaped O-ring into the groove where it needs to be installed, thereby completing the non-destructive assembly of the shaft-shaped O-ring at any position on the target shaft.

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