Mechanical arm joint with double-sealing component

Abstract

The utility model discloses a mechanical arm joint with a double-sealing component, which relates to the technical field of mechanical arm joints, and comprises a joint, a first connecting rod, a second connecting rod, a third connecting rod, a fourth connecting rod, a fifth connecting rod and a sixth connecting rod, the end of the joint protecting cover is connected with the second end through a second connecting piece, the joint protecting cover is arranged around the side portion of the joint and located between the first connecting rod and the second connecting rod, the joint protecting cover comprises a plurality of protecting cover pieces, and the protecting cover pieces are connected through matched third connecting pieces so as to seal the joint; a sealing piece is arranged between the side portion of the second end and the interior of the joint protection cover, the sealing piece is in interference fit with the side portion of the second end, the sealing piece and the side portion of the second end are in interference fit to form a first protection barrier, and the joint protection cover formed by combining a plurality of protection cover pieces through third connecting pieces provides second sealing protection. And invasion of external pollutants is effectively prevented.

Description

Technical Field

[0001] This utility model relates to the field of robotic arm joint technology, and in particular to a robotic arm joint with a double sealing component. Background Technology

[0002] With the rapid development of industrial automation and service robot technology, the reliability and durability of robotic arm joints under complex working conditions (such as high humidity, liquid contact, or dusty environments) have become key challenges. Traditional robotic arm joint sealing designs mostly adopt a single static sealing structure (such as O-rings or sealant), which has significant drawbacks in practical applications: during the dynamic swinging of the joint, gaps are easily generated at the sealing interface due to mechanical movement, leading to liquid infiltration and subsequently causing corrosion of the internal reducer or failure of electronic components; while over-reliance on complex sealing structures (such as multi-layer labyrinth seals) can improve protective performance, it significantly increases manufacturing costs, and the structure is cumbersome to disassemble and assemble, resulting in high maintenance costs. In addition, the compatibility between static sealing and dynamic protection in existing technologies is insufficient, making it difficult to meet the long-term stability requirements of robotic arms in diverse scenarios (such as medical disinfection and outdoor operations).

[0003] To address the aforementioned issues, the industry has attempted optimization by adding auxiliary sealing layers or improving material properties, but limitations remain: on the one hand, multi-stage sealing structures often lead to increased installation complexity due to the high precision requirements between components, making them prone to seal failure due to assembly errors; on the other hand, traditional cover designs are mostly fixed integral structures, requiring the disassembly of numerous related components during joint maintenance or seal replacement, which is time-consuming, labor-intensive, and carries the risk of secondary damage. Therefore, there is an urgent need for a robotic arm joint sealing solution that balances dynamic sealing reliability, lightweight structure, and ease of maintenance. Utility Model Content

[0004] The main purpose of this invention is to provide a robotic arm joint with dual sealing components, which aims to solve the problem of poor sealing when the robotic arm is turned off.

[0005] To achieve the above objectives, this utility model proposes a robotic arm joint with a double sealing component, the robotic arm joint comprising:

[0006] A joint having a first end and a second end opposite to each other;

[0007] The first link has its end connected to the first end via a first connector;

[0008] The second link has its end connected to the second end via a second connector;

[0009] A joint cover, the joint cover being disposed around the side of the joint and located between the first link and the second link;

[0010] The joint cover includes a plurality of cover plates, which are connected to each other by a suitable third connector to seal the joint;

[0011] A sealing element is provided between the second end side and the inside of the joint cover, and the sealing element is interference-fitted with the second end side.

[0012] Preferably, a plurality of silicone blocks are provided on the side of the joint cover facing the joint side, and the plurality of silicone blocks are distributed at intervals around the joint side.

[0013] Preferably, the third connector includes a plurality of third fastening screws;

[0014] The number of the protective cover plates is two, and the ends of the two protective cover plates arranged opposite each other are fastened together by the corresponding third fastening screws.

[0015] Preferably, the outer and inner peripheries of the joint cover facing the second connecting rod are respectively provided with a first chamfer and a second chamfer;

[0016] The outer periphery of the joint cover facing the first connecting rod has a third chamfer.

[0017] Preferably, the second end includes a harmonic reducer, and the seal is bonded to the side of the harmonic reducer facing the inside of the first connecting rod.

[0018] Preferably, the joint side is provided with a nickel plating layer.

[0019] Preferably, the sealing element includes a lip seal ring, and the side of the lip seal ring facing the joint side is provided with a plurality of annular lip protrusions, and the annular lip protrusions are interference-fitted with the nickel-plated side.

[0020] Preferably, the lip seal ring has a recessed groove on the side facing the harmonic reducer to accommodate the second connector; and

[0021] The lip seal has a fourth chamfer on the outer periphery of the side facing the harmonic reducer.

[0022] Preferably, the second connector includes a plurality of second fastening screws, which are distributed around the joint side portion.

[0023] Preferably, the first connector includes a plurality of first fastening screws, which are distributed around the joint side portion.

[0024] The beneficial effects of this utility model are as follows: the robotic arm joint forms a first protective barrier through the interference fit between the seal and the side of the joint, while the joint cover formed by multiple cover plates combined by a third connector provides a second layer of sealing protection, effectively preventing the intrusion of external contaminants. Secondly, the modular design of the joint cover facilitates partial disassembly and maintenance, reducing operation and maintenance costs. Furthermore, the interference fit between the seal and the side of the joint also ensures the durability of the dynamic seal. Therefore, the above design makes the overall structure have high sealing performance, easy maintenance and wide applicability, especially suitable for robotic arm applications in high-precision or harsh environments. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of this utility model;

[0027] Figure 2 This is an exploded view of the present invention;

[0028] Figure 3 This is a cross-sectional view of the present invention;

[0029] Figure 4 for Figure 3 A magnified view of part A in the image;

[0030] Label Explanation:

[0031] 1. Joint; 11. First end; 12. Second end; 121. Harmonic reducer;

[0032] 2. First link;

[0033] 3. Second link;

[0034] 4. Joint cover; 41. Cover piece; 42. Silicone block; 43. First chamfer; 44. Second chamfer; 45. Third chamfer;

[0035] 5. Sealing element; 51. Lip seal; 511. Annular lip protrusion; 52. Groove; 53. Fourth chamfer;

[0036] 6. First connecting component;

[0037] 7. Second connector.

[0038] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0039] 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.

[0040] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0041] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0042] This utility model provides a robotic arm joint with a double sealing component. Please refer to [reference needed]. Figures 1-4The robotic arm joint includes a joint 1, a first link 2, a second link 3, and a joint cover 4. The joint 1 has a first end 11 and a second end 12. The end of the first link 2 is connected to the first end 11 via a first connector 6, and the end of the second link 3 is connected to the second end 12 via a second connector 7. The joint cover 4 is arranged around the side of the joint 1 and is located between the first link 2 and the second link 3. The joint cover 4 includes several cover plates 41, which are connected by a matching third connector to seal the joint 1. A sealing element is provided between the side of the second end 12 and the interior of the joint cover 4. 5. The seal 5 is press-fitted with the side of the second end 12. The above design forms the first protective barrier through the press-fit of the seal 5 and the joint 1. The joint cover 4, which is formed by multiple cover plates 41 combined by the third connector, provides the second sealing protection, effectively preventing the intrusion of external contaminants. Secondly, the modular design of the joint cover 4 facilitates partial disassembly and maintenance, reducing operation and maintenance costs. Furthermore, the press-fit design of the seal 5 and the side of the joint 1 also ensures the durability of the dynamic seal. Therefore, this setting makes the overall structure have high sealing performance, easy maintenance and wide applicability, especially suitable for robotic arm applications in high-precision or harsh environments.

[0043] In this embodiment, please refer to Figure 2 and Figure 3 The joint cover 4 has several silicone blocks 42 on the side facing the joint 1. The silicone blocks 42 are spaced apart and surround the side of the joint 1. This arrangement is mainly to prevent damage to the side of the joint 1 during the connection and locking of the cover plate 41 and other cover plates 41 in the joint cover 4, thereby providing a cushioning effect. Secondly, the arrangement of silicone blocks 42 also allows the joint cover 4 to be flexibly supported on the outside of the joint 1. In other embodiments, the silicone blocks 42 can be replaced by structures made of other flexible materials, such as sponge, elastic elements, etc.

[0044] In this embodiment, the third connector (not shown) includes several third fastening screws and two cover plates 41. The ends of the two cover plates 41, which are arranged opposite each other, are fastened together by corresponding third fastening screws. Specifically, during the tightening process of the matching third fastening screws, the joint cover 4 formed by the two cover plates 41 will gradually move closer to the side of the joint 1 to fix it to the side of the joint 1. Furthermore, the modular design of the joint cover 4 facilitates the maintenance and replacement of damaged cover plates 41 without the need to replace the entire integrated joint cover 4, which greatly saves maintenance costs.

[0045] In other embodiments, the number of cover plates 41 may also be three, four, etc., and the specific number may be determined according to the inner diameter of the joint 1.

[0046] For further details, please refer to... Figure 3 and Figure 4 The joint cover 4 has a first chamfer 43 and a second chamfer 44 on the outer and inner periphery of the side facing the second connecting rod 3, respectively. The joint cover 4 has a third chamfer 45 on the outer periphery of the side facing the first connecting rod 2. The second chamfer 44 can guide the cover plate 41 during the locking process, making it easier for the cover plate 41 to approach the joint 1. The first chamfer 43 and the third chamfer 45 are set to prevent the user from scratching the user during the operation of the third connecting piece, that is, to provide protection.

[0047] For details, please refer to Figures 2-4 The second end 12 of the joint 1 includes a harmonic reducer 121. The seal 5 is bonded to the side of the harmonic reducer 121 facing the inside of the first connecting rod 2. The side of the joint 1 is provided with a nickel plating layer (not shown). The seal 5 includes a lip seal ring 51. The side of the lip seal ring 51 facing the side of the joint 1 is provided with several annular lip protrusions 511. The annular lip protrusions 511 are interference-fitted with the side of the nickel plating layer.

[0048] In this embodiment, there are two annular lip protrusions 511. The annular lip protrusions 511 are interference-fitted with the side of the nickel plating layer. On the one hand, the position of the lip seal ring 51 is stabilized. On the other hand, the annular lip protrusions 511 generate continuous normal contact pressure through the compression and rebound characteristics of the material itself, thereby establishing a first-level sealing interface and reducing the risk of external liquid entering the joint 1. The interference fit range between the annular lip protrusions 511 and the nickel plating layer is 0.2-0.3 mm.

[0049] In other embodiments, the number of annular lip protrusions 511 may be three, four, or other numbers, depending on the vertical length of the side of joint 1.

[0050] In this embodiment, please refer to Figure 2 The lip seal 51 has a recessed groove 52 on the side facing the harmonic reducer 121 to accommodate the second connector 7. This design ensures that the lip seal 51 can be stably mounted on the harmonic reducer 121. It also ensures that the second connector 7 will not be hindered from securely connecting the harmonic reducer 121 to the second connecting rod 3 due to the design of other structures. Furthermore, the outer periphery of the side of the lip seal 51 facing the harmonic reducer 121 has a fourth chamfer 53. Through the fourth chamfer 53, the lip seal 51 can be accurately connected to the harmonic reducer 121 without damaging the inner wall of the joint cover 4 during the connection process. In other words, the fourth chamfer 53 mainly serves a protective function.

[0051] In this embodiment, please refer to Figure 2The second connector 7 includes a plurality of second fastening screws distributed around the side of the joint 1, and the first connector 6 includes a plurality of first fastening screws distributed around the side of the joint 1. The above arrangement mainly facilitates the assembly and disassembly of the joint 1 with the first link 2 and the second link 3 respectively. In other embodiments, the first connector 6 and the second connector 7 can be other structures, such as bolts, fasteners, etc.

[0052] In this embodiment, the seal 5 and the joint cover 4 together constitute a double waterproof structure for the robotic arm joint. The seal 5 is mainly responsible for preventing water from entering through the gap between the joint 1 and the joint cover 4, while the joint cover 4 provides external protection for the entire joint 1 and prevents water from penetrating from the surface of the joint 1. This multi-layered waterproof design enables the robotic arm joint to maintain good waterproof performance in various complex working environments, effectively extending the service life and reliability of the robotic arm.

[0053] The above description is only an optional embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A mechanical arm joint having a double seal member, characterized by, The mechanical arm joint comprises: a joint having opposite first and second ends; a first connecting rod, the end of which is connected to the first end through a first connecting piece; a second connecting rod, the end of which is connected to the second end through a second connecting piece; a joint cover, which is arranged around the side of the joint and between the first and second connecting rods; the joint cover comprises a plurality of cover pieces, which are connected through adapted third connecting pieces to seal the joint; a sealing piece is arranged between the side of the second end and the inside of the joint cover, and the sealing piece is in interference fit with the side of the second end.

2. The robot arm joint according to claim 1, characterized in that, The side of the joint cover facing the side of the joint is provided with a plurality of silica gel blocks, which are spaced around the side of the joint.

3. The robotic arm joint of claim 2, wherein, The third connecting piece comprises a plurality of third fastening screws; the number of cover pieces is two, and the ends of the two cover pieces arranged in opposition are fastened and connected through corresponding third fastening screws.

4. The robotic arm joint of claim 3, wherein, The outer periphery and inner periphery of the side of the joint cover facing the second connecting rod are respectively provided with first and second chamfers; the outer periphery of the side of the joint cover facing the first connecting rod is provided with a third chamfer.

5. The robot joint of claim 1, wherein: The second end comprises a harmonic reducer, and the sealing piece is arranged in bonding on the side of the harmonic reducer facing the inside of the first connecting rod.

6. The robot joint of claim 5, wherein: The side of the joint is provided with a nickel plating layer.

7. The robot joint of claim 6, wherein: The sealing piece comprises a lip-shaped sealing ring, the side of which facing the side of the joint is provided with a plurality of annular lip portion protrusions, which are in interference fit with the side of the nickel plating layer.

8. The robotic arm joint of claim 7, wherein, The side of the lip-shaped sealing ring facing the harmonic reducer is concave and has a slot for accommodating the second connecting piece; and the outer periphery of the side of the lip-shaped sealing ring facing the harmonic reducer is provided with a fourth chamfer.

9. The robotic arm joint of claim 8, wherein, The second connecting piece comprises a plurality of second fastening screws, which are distributed around the side of the joint.

10. The robot arm joint according to any one of claims 1-9, characterized in that, The first connecting piece comprises a plurality of first fastening screws, which are distributed around the side of the joint.

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