Small-size oil seal spring hanging tool

Abstract

The utility model relates to the technical field of oil seal production and assembly, and concretely relates to a small -size oil seal spring hanging tool. Including spring hanging rod, fixedly installed sleeve pipe in spring hanging rod lower extreme, the positioning rod that can telescopic installation in the sleeve pipe, the lower extreme of sleeve pipe is provided with the spring ring that fits on the positioning rod, the positioning rod is cylindrical structure, the spring ring is by the annular structure of magnetic conductive material preparation, inner diameter adaptation positioning rod, the outside of spring ring is equipped with the magnetic ring with magnetic attraction. The spring hanging tool utilizes magnetic attraction and adsorbs oil seal spring in the lower extreme of positioning rod, and the lower extreme of positioning rod does not need to set down concave spring groove, and oil seal spring does not need to install on the positioning rod through spring groove, and there is almost no friction between oil seal spring and positioning rod when installing oil seal spring with spring ring, and its structure is compact, easy to operate, long in service life, can realize oil seal spring fast positioning and accurate press -fit, improves the assembly efficiency and yield of small -size oil seal.

Description

Technical Field

[0001] This utility model relates to the technical field of oil seal production and assembly, specifically a small-size oil seal spring hanger tool. Background Technology

[0002] As a critical sealing element in mechanical equipment, the assembly precision of the internal spring of an oil seal directly affects its sealing performance and service life. For small-sized oil seals, such as miniature oil seals with a diameter of less than 10mm, the traditional manual assembly method is inefficient and time-consuming due to their small size and easily deformable springs, making it difficult to meet the needs of mass production. In addition, manual assembly relies on experience, making it difficult to ensure consistency, and uneven force can easily cause spring deformation or damage to the oil seal lip. Chinese Patent 2017207699459 discloses "An Oil Seal Spring Hanger," authorized publication number CN206845900U. This oil seal spring hanger includes a cylinder mounting base connected to a cylinder. The cylinder mounting base and a push spring sleeve below it are connected at their edges by connecting screws. The push spring sleeve is fitted over the spring seat. A return spring seat is connected to the top of the spring seat, and a return spring is connected to the bottom of the cylinder mounting base. The lower end of the spring seat is connected to a spring groove mounting base. A spring groove is provided on the side wall of the spring groove mounting base, and a spring is installed inside the spring groove. The lower end of the spring groove mounting base is mounted on an oil seal delivery base. It can be used in conjunction with an external automatic control device to achieve automatic spring hanging of the oil seal, improving the hanging speed and accuracy. However, because the outer diameter of the spring slot fixing seat is larger than the outer diameter of the spring, when this type of oil seal spring hanger is used, the spring pushed out of the spring slot will rub against the side wall of the spring slot. After prolonged use, the lower side wall of the spring slot will be worn flat, making it impossible to install the spring in the spring slot, causing the equipment to be scrapped. In addition, the friction between the spring and the side wall of the spring slot when it is pushed out of the spring slot can also scratch the surface of the spring, and even form burrs on the surface of the spring, causing potential product quality problems. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a small-sized oil seal spring fixture with a compact structure, simple operation and long service life, so as to realize the rapid positioning and precise pressing of oil seal springs, and improve the assembly efficiency and yield of small-sized oil seals.

[0004] The technical solution adopted by this utility model to solve the technical problem is:

[0005] The present invention discloses a small-sized oil seal spring mounting fixture, comprising a spring rod, a sleeve fixedly installed at the lower end of the spring rod, and a positioning rod telescopically installed in the sleeve. The lower end of the sleeve is provided with a compression spring ring fitted on the positioning rod. The positioning rod is a cylindrical structure, and the compression spring ring is a ring structure made of magnetically conductive material with an inner diameter adapted to the positioning rod. A magnetic ring with magnetic attraction force is fitted on the outer side of the compression spring ring.

[0006] This solution utilizes magnetic attraction to attach the oil seal spring to the lower end of the positioning rod. When installing the oil seal spring using the compression spring ring, there is almost no friction between the oil seal spring and the positioning rod. It features a compact structure, simple operation, and long service life, enabling rapid positioning and precise pressing of the oil seal spring, thereby improving the assembly efficiency and yield of small-sized oil seals.

[0007] Preferably, the upper end of the positioning rod is provided with a limiting boss, and the upper end of the limiting boss is provided with a guide rod. Both the limiting boss and the guide rod are cylindrical structures, and both the limiting boss and the guide rod are coaxially arranged with the positioning rod. The diameter of the limiting boss is larger than that of the positioning rod, and the diameter of the guide rod is smaller than that of the limiting boss. A return spring is fitted on the guide rod. The inner cavity of the sleeve is provided with an upper cavity whose inner diameter is adapted to the limiting boss and a lower cavity whose inner diameter is adapted to the positioning rod. The lower cavity is located inside the compression spring ring.

[0008] This solution uses a limiting boss and a guide rod to limit the extension and retraction range of the positioning rod, keeping the range of motion within the necessary limits for installing the oil seal spring, thus avoiding unnecessary large movements that could damage the oil seal.

[0009] Preferably, the upper cavity of the sleeve is provided with an internal thread, and the lower end of the hanging spring rod is provided with a threaded sleeve with an external thread, and the threaded sleeve is installed in the upper cavity of the sleeve by a threaded connection.

[0010] This solution allows for quick assembly and disassembly of the spring rod, facilitating maintenance and upkeep.

[0011] Preferably, the magnetic ring is an annular structure with an inner diameter adapted to the outer diameter of the compression spring ring, and multiple permanent magnets are embedded in the magnetic ring, the multiple permanent magnets being evenly distributed along the circumference of the magnetic ring.

[0012] This solution generates multiple uniformly distributed magnetic fields around the compression spring ring to attract the oil seal spring.

[0013] Preferably, the magnetic ring is an annular structure with an inner diameter adapted to the outer diameter of the compression spring ring, and an electromagnet is embedded in the magnetic ring.

[0014] This solution generates a uniformly distributed magnetic field around the compression spring ring, which is used to attract the oil seal spring.

[0015] Due to the aforementioned structure, this spring-loaded fixture uses magnetic attraction to attach the oil seal spring to the lower end of the positioning rod. The lower end of the positioning rod does not require a recessed spring groove, and the oil seal spring does not need to be installed on the positioning rod through the spring groove. When the oil seal spring is installed using the compression spring ring, there is almost no friction between the oil seal spring and the positioning rod. Its structure is compact, easy to operate, and has a long service life. It can achieve rapid positioning and precise pressing of the oil seal spring, improving the assembly efficiency and yield of small-sized oil seals. Attached Figure Description

[0016] Figure 1 This is a structural schematic diagram of one embodiment of the present invention.

[0017] Figure 2 yes Figure 1 A top view of the magnetic ring in the embodiment.

[0018] Figure 3 This is a top view of another embodiment of the magnetic ring. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] This utility model discloses a small-sized oil seal spring mounting fixture, comprising a spring rod 1, a sleeve 2 fixedly installed at the lower end of the spring rod 1, and a positioning rod 3 retractably installed in the sleeve 2. The sleeve 2 is made of magnetically conductive materials such as steel, while the spring rod 1 and positioning rod 3 can be made of steel, copper, aluminum, various alloys, engineering plastics, etc. A compression spring ring 4 is fitted onto the positioning rod 3 at the lower end of the sleeve 2. The positioning rod 3 is a cylindrical structure, and the compression spring ring 4 is a ring-shaped structure made of magnetically conductive material with an inner diameter adapted to the positioning rod 3. A magnetic ring 5 with magnetic attraction is fitted onto the outer side of the compression spring ring 4. The outer diameter of the positioning rod 3 is adapted to the inner diameter of the oil seal spring 7, allowing the oil seal spring 7 to easily fit onto the positioning rod 3 while maintaining concentricity. The wall thickness of the compression spring ring 4 is approximately equal to the diameter of the spring wire of the oil seal spring 7, so that when the compression spring ring 4 is pressed down, it pushes the oil seal spring 7 downward through its end face. Figure 2 As shown, the magnetic ring 5 is an annular structure with an inner diameter adapted to the outer diameter of the compression spring ring 4. The upper end of the magnetic ring 5 has an outwardly folded edge 52, which is fixedly connected to the lower end of the sleeve 2 by connecting bolts. Multiple permanent magnets 51 are embedded in the magnetic ring 5, and the multiple permanent magnets 51 are evenly distributed along the circumference of the magnetic ring 5. Figure 1, Figure 2 In this embodiment, the permanent magnet 51 is a rectangular bar magnet. The permanent magnet 51 is longitudinally positioned and embedded in the side wall of the magnetic ring 5. Due to the magnetic conduction of the compression spring ring 4, the permanent magnet 51 generates a magnetic attraction force on the lower end face of the compression spring ring 4. This magnetic attraction force can attract the oil seal spring 7, which is sleeved on the lower end of the positioning rod 3, to the lower end face of the compression spring ring 4. Alternatively, the permanent magnet 51 can also be a cylindrical magnet with a circular cross-section or a sheet magnet.

[0021] Furthermore, as another embodiment of this utility model, such as Figure 3 As shown, the magnetic ring 5 is an annular structure with an inner diameter adapted to the outer diameter of the compression spring ring 4, and an electromagnet 53 is embedded in the magnetic ring 5. When the electromagnet 53 is energized, it generates a magnetic field, forming a magnetic force at the lower end of the compression spring ring 4 to attract the oil seal spring 7, which is sleeved on the lower end of the positioning rod 3, to the lower end of the compression spring ring 4.

[0022] Additionally, the upper end of the positioning rod 3 is provided with a limiting boss 31, and the upper end of the limiting boss 31 is provided with a guide rod 32. Both the limiting boss 31 and the guide rod 32 are cylindrical structures, and both are integrated structures coaxially arranged with the positioning rod 3. The diameter of the limiting boss 31 is larger than that of the positioning rod 3, and a lower step protruding from the upper end of the positioning rod 3 is formed at the lower end of the limiting boss 31. The diameter of the guide rod 32 is smaller than that of the limiting boss 31, and an upper step is formed at the connection between the upper end of the limiting boss 31 and the guide rod 32. A return spring 6 is fitted on the guide rod 32. The lower end of the return spring 6 abuts against the upper step at the upper end of the limiting boss 31, and the upper end of the return spring 6 abuts against the lower end of the hanging spring rod 1. There is a certain gap between the upper end of the guide rod 32 and the lower end of the hanging spring rod 1, which limits the range of motion of the positioning rod 3. In the initial state, as Figure 1 As shown, the reset spring 6 pushes the limiting boss 31 and the positioning rod 3 to the lower stop point. At this time, the lower end of the positioning rod 3 extends slightly beyond the lower end face of the compression spring ring 4. The part of the positioning rod 3 extending out of the compression spring ring 4 is just enough to install the oil seal spring 7. After the positioning rod 3 moves upward and retracts completely into the compression spring ring 4, the lower end face of the positioning rod 3 is flush with the lower end face of the compression spring ring 4. At this time, the upper end of the guide rod 32 just touches the lower end of the hanging spring rod 1, preventing the positioning rod 3 from continuing to move upward.

[0023] To accommodate the limiting boss 31, the inner cavity of the sleeve 2 is provided with an upper cavity whose inner diameter matches the limiting boss 31 and a lower cavity whose inner diameter matches the positioning rod 3. The lower cavity is located inside the compression spring ring 4. The upper cavity of the sleeve 2 is provided with an internal thread, and the lower end of the hanging spring rod 1 is provided with a threaded sleeve 11 with external threads. The threaded sleeve 11 and the hanging spring rod 1 are an integral structure and coaxially arranged. The threaded sleeve 11 is installed in the upper cavity of the sleeve 2 via a threaded connection. During installation, simply rotating the hanging spring rod 1 connects the two together. Additionally, to prevent loosening at the threaded connection, such as... Figure 1 As shown, a bolt mounting hole is provided at the eccentric position of the end face of the sleeve 2, corresponding to the position of the hanging spring rod 1. After the hanging spring rod 1 is installed in place, the positioning bolt 9 is inserted into the bolt mounting hole to lock the relative position of the sleeve 2 and the hanging spring rod 1 and prevent the threads from loosening.

[0024] like Figure 1 As shown, in use, the oil seal spring 7 is fitted onto the part of the positioning rod 3 that extends out of the compression spring ring 4. The magnetic field generated by the magnetic ring 5 attracts the oil seal spring 7 to the bottom of the compression spring ring 4. When the oil seal conveying device transports the oil seal 10 to be assembled to the area directly below the positioning rod 3, the positioning rod 3 is aligned with the center of the oil seal 10 and pressed onto it. At this time, the positioning rod 3 stops descending due to the obstruction of the oil seal 10. The spring rod 1 is then pressed down, and the spring rod 1, sleeve 2, and compression spring ring 4 continue to descend against the resistance of the return spring 6. During the descent, the compression spring ring 4 pushes the oil seal spring 7 downward and engages it in the spring groove of the oil seal 10, completing the assembly of the oil seal spring 7. After the oil seal spring 7 is engaged in the spring groove of the oil seal 10, the spring groove has a strong holding force on the oil seal spring 7, which can prevent the oil seal spring 7 from falling off. At this time, the compression spring ring 4 is released, and the positioning rod 3 returns to its original position under the force of the return spring 6, with its lower end extending out of the compression spring ring 4 again, waiting for the next working cycle. In practical use, the spring-holding rod 1 can be mounted on a pneumatic or hydraulic device, and mechanical force can be used to push the spring-holding rod 1 to complete the assembly of the oil seal spring 7. Alternatively, the assembly worker can manually assemble the oil seal spring 7 by holding the spring-holding rod 1. The use of pneumatic and hydraulic devices are existing technologies and will not be described in detail here.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A small size oil seal spring hanging tool, comprising a spring hanging rod (1), a sleeve (2) fixedly installed at the lower end of the spring hanging rod (1), and a positioning rod (3) telescopically installed in the sleeve (2), characterized in that, The lower end of the sleeve (2) is provided with a compression spring ring (4) fitted on the positioning rod (3). The positioning rod (3) is a cylindrical structure. The compression spring ring (4) is a ring structure made of magnetic material with an inner diameter adapted to the positioning rod (3). A magnetic ring (5) with magnetic attraction is fitted on the outer side of the compression spring ring (4).

2. A small size oil seal spring hanging tool according to claim 1, characterized in that, The upper end of the positioning rod (3) is provided with a limiting boss (31), and the upper end of the limiting boss (31) is provided with a guide rod (32). The limiting boss (31) and the guide rod (32) are both cylindrical structures, and the limiting boss (31) and the guide rod (32) are coaxially arranged with the positioning rod (3). The diameter of the limiting boss (31) is larger than that of the positioning rod (3), and the diameter of the guide rod (32) is smaller than that of the limiting boss (31). A reset spring (6) is fitted on the guide rod (32). The inner cavity of the sleeve (2) is provided with an upper cavity whose inner diameter is adapted to the limiting boss (31) and a lower cavity whose inner diameter is adapted to the positioning rod (3). The lower cavity is located inside the compression spring ring (4).

3. A small size oil seal spring hanging tool according to claim 2, characterized in that, The upper cavity of the sleeve (2) is provided with an internal thread, and the lower end of the hanging spring rod (1) is provided with a threaded sleeve (11) with an external thread. The threaded sleeve (11) is installed in the upper cavity of the sleeve (2) by a threaded connection.

4. The small size oil seal spring hanging tool according to claim 1 or 2, characterized in that, The magnetic ring (5) is an annular structure with an inner diameter that matches the outer diameter of the compression spring ring (4). Multiple permanent magnets (51) are embedded in the magnetic ring (5), and the multiple permanent magnets (51) are evenly distributed along the circumference of the magnetic ring (5).

5. The small size oil seal spring hanging tool according to claim 1 or 2, characterized in that, The magnetic ring (5) is an annular structure with an inner diameter that matches the outer diameter of the compression spring ring (4), and an electromagnet is embedded in the magnetic ring (5).

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