Low-speed large-torque electric spindle maintenance-free sealing structure

Abstract

The utility model belongs to the electric main shaft sealing technical field, concretely relates to low speed big torque electric main shaft maintenance -free sealing structure, including electric main shaft body and setting on the front end sealing subassembly, magnetic fluid sealing subassembly and elastic sealing subassembly of electric main shaft body, electric main shaft body sets up in the casing, the front end sealing subassembly, magnetic fluid sealing subassembly and elastic sealing subassembly all set up in the casing. The utility model through the front end sealing subassembly, magnetic fluid sealing subassembly and elastic sealing subassembly of integrated setting on the electric main shaft body, has built three -step progressive type sealing system. Three -level sealing structure cooperation, not only effectively blocks up lubricating medium leakage and external contaminant invasion, can also provide radial stable support when electric main shaft bears big torque load, keeps the dynamic adhesion of sealing interface, thereby ensures the sealing reliability under the long -term operation, realizes the design goal of maintenance -free truly.

Description

Technical Field

[0001] This utility model belongs to the field of electric spindle sealing technology, specifically relating to a maintenance-free sealing structure for low-speed, high-torque electric spindles. Background Technology

[0002] Existing electric spindles typically employ a single-structure seal between the spindle and the mounting cavity during installation, such as traditional O-rings or lip seals. While this single-seal structure may meet requirements under normal operating conditions, the unique working characteristics of low-speed, high-torque electric spindles present significant challenges to the sealing system during long-term operation. Low-speed, high-torque electric spindles withstand substantial radial and axial combined loads during startup and operation. Simultaneously, due to the low speed, it is difficult to form an effective hydrodynamic lubrication film, resulting in boundary lubrication or even dry friction at the sealing interface, significantly exacerbating wear on the sealing surface. With accumulated operating time, the seals are prone to plastic deformation, material wear, or elastic failure under continuous high-torque alternating loads, leading to a decline in sealing performance, manifesting as lubricant leakage or external contaminant intrusion into the cavity. To address this technical challenge, this invention proposes a maintenance-free sealing structure for low-speed, high-torque electric spindles, effectively solving the aforementioned problems through an innovative multi-seal design. Utility Model Content

[0003] The purpose of this invention is to provide a maintenance-free sealing structure for low-speed, high-torque electric spindles, which can solve the above-mentioned technical problems.

[0004] The specific technical solution adopted by this utility model is as follows:

[0005] The maintenance-free sealing structure for a low-speed, high-torque electric spindle provided by this utility model includes an electric spindle body and a front-end sealing assembly, a magnetohydrodynamic sealing assembly, and an elastic sealing assembly disposed on the electric spindle body. The electric spindle body is disposed inside a housing, and the front-end sealing assembly, the magnetohydrodynamic sealing assembly, and the elastic sealing assembly are all disposed inside the housing.

[0006] The front sealing assembly includes an inner extension stop ring, a first elastic element, and a self-retracting sealing ring. The inner extension stop ring is rotatably mounted on the electric spindle body via a bearing and is located at the front end of the inner cavity of the housing. The first elastic element is sleeved on the electric spindle body and is located between the inner extension stop ring and the first inner conical ring. The first inner conical ring is mounted on the electric spindle body and is located inside the housing. The self-retracting sealing ring is mounted on the electric spindle body and is embedded in the first inner conical ring. A first clamping ring for pressing the self-retracting sealing ring is installed inside the housing via screws. The first clamping ring is rotatably engaged with the electric spindle body via a bearing.

[0007] Preferably, the magnetofluid sealing assembly includes a side ring and a plurality of magnet rings, with magnetic pole rings disposed between adjacent magnet rings. Both the magnet rings and the magnetic pole rings are mounted on the electric spindle body. Two side rings are provided and located inside the housing. The side rings are rotatably engaged with the electric spindle body through bearings. A magnetofluid cavity for filling with magnetofluid is provided between the outer periphery of the electric spindle and the magnet rings inside the housing.

[0008] Preferably, a second clamping ring for clamping the side retaining ring is installed inside the housing by screws, and the second clamping ring is rotatably engaged with the electric spindle body through a bearing.

[0009] Preferably, the elastic sealing assembly includes two second inner conical rings, an inner sealing ring, and a second elastic element. The inner sealing rings are configured as two and are symmetrically installed on the electric spindle body and located inside the housing. The two second inner conical rings are symmetrically arranged on opposite sides of the two inner sealing rings and are installed on the electric spindle body. The second elastic element is arranged between the two inner sealing rings and is sleeved on the electric spindle body.

[0010] Preferably, the end face of the housing is fitted with an outer clamping ring for pressing the elastic sealing assembly by screws, and the outer clamping ring is rotatably engaged with the electric spindle body by bearings.

[0011] Preferably, symmetrical conical rings are rotatably mounted on opposite sides of the two second inner conical rings via bearings, and the opposite sides of the two inner sealing rings abut against the two conical rings respectively.

[0012] Preferably, the housing is provided with a plurality of spacer sealing rings, wherein two of the spacer sealing rings are installed between the outer periphery of the two second inner conical rings and the inner cavity of the housing, and the other spacer sealing ring is installed between the outer periphery of the first inner conical ring and the inner cavity of the housing.

[0013] The beneficial effects are:

[0014] This invention constructs a three-stage progressive sealing system by integrating a front-end sealing assembly, a magnetohydrodynamic sealing assembly, and an elastic sealing assembly onto the electric spindle body. The front-end sealing assembly forms a primary dynamic seal at the front end of the housing cavity; the magnetohydrodynamic sealing assembly serves as a secondary seal, achieving a contactless seal through magnetically confined magnetohydrodynamic fluid; and the elastic sealing assembly provides a final stage of compensating sealing. The synergistic effect of these three sealing structures not only effectively prevents lubricant leakage and external contaminant intrusion but also provides radial stability support under high torque loads on the electric spindle, maintaining the dynamic fit of the sealing interface. This ensures sealing reliability during long-term operation, truly achieving the design goal of maintenance-free operation. Attached Figure Description

[0015] Figure 1This is a schematic diagram of the main structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the explosive distribution structure of each sealing component of this utility model.

[0017] The attached diagram lists the components represented by each number as follows:

[0018] 1. Electric spindle body; 2. Housing; 3. Inner extension stop ring; 4. First elastic element; 5. First inner conical ring; 6. Spacer sealing ring; 7. Self-retracting sealing ring; 8. First clamping ring; 9. Washer ring; 10. Side retainer ring; 11. Magnet ring; 12. Magnetic pole ring; 13. Magnetorheological fluid cavity; 14. Second clamping ring; 15. Second inner conical ring; 16. Inner retracting sealing ring; 17. Second elastic element; 18. Outer clamping ring. Detailed Implementation

[0019] To make the objectives and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of this utility model and does not strictly limit the scope of protection specifically claimed by this utility model.

[0020] like Figure 1-2 As shown, the low-speed, high-torque electric spindle maintenance-free sealing structure includes an electric spindle body 1 and a front-end sealing assembly, a magnetic fluid sealing assembly, and an elastic sealing assembly disposed on the electric spindle body 1. The electric spindle body 1 is disposed inside a housing 2, and the front-end sealing assembly, the magnetic fluid sealing assembly, and the elastic sealing assembly are all disposed inside the housing 2.

[0021] The front sealing assembly includes an inner extension stop ring 3, a first elastic element 4, and a self-retracting sealing ring 7. The inner extension stop ring 3 is rotatably mounted on the electric spindle body 1 via a bearing and is located at the front end of the inner cavity of the housing 2. The first elastic element 4 is sleeved on the electric spindle body 1 and is located between the inner extension stop ring 3 and the first inner conical ring 5. The first inner conical ring 5 is mounted on the electric spindle body 1 and is located inside the housing 2. The self-retracting sealing ring 7 is mounted on the electric spindle body 1 and is embedded in the first inner conical ring 5. A first clamping ring 8 for pressing the self-retracting sealing ring 7 is installed inside the housing 2 via screws. The first clamping ring 8 is rotatably engaged with the electric spindle body 1 via a bearing. The first inner conical ring 5 and the self-retracting sealing ring 7 are rotatably mounted on the opposite side via a bearing. The first elastic element 4 is a spring, and after being pressed by the first clamping ring 8, its rebound force is not less than 150N.

[0022] As an optional implementation, the magnetic fluid sealing assembly includes a side retaining ring 10 and a plurality of magnet rings 11. Magnetic pole rings 12 are arranged between adjacent magnet rings 11. Both magnet rings 11 and magnetic pole rings 12 are mounted on the electric spindle body 1. Two side retaining rings 10 are provided and located inside the housing 2. The side retaining rings 10 are rotatably engaged with the electric spindle body 1 via bearings. A magnetic fluid cavity 13 for filling with magnetic fluid is provided between the outer periphery of the electric spindle inside the housing 2 and the magnet rings 11, thereby facilitating the filling of magnetic fluid and its engagement with the magnet rings 11 and magnetic pole rings 12 to achieve the sealing effect of magnetic fluid.

[0023] Furthermore, a second clamping ring 14 for clamping the side retaining ring 10 is installed inside the housing 2 by screws. The second clamping ring 14 is rotatably engaged with the electric spindle body 1 through a bearing. In this way, the second clamping ring 14 can constrain the magnetic fluid sealing assembly between the first clamping ring 8, thereby cooperating with the side retaining ring 10 to seal both sides of the magnetic fluid sealing assembly and improve the sealing effect. A washer 9 is provided between one of the side retaining rings 10 and the first clamping ring 8, and the washer 9 is sleeved on the electric spindle body 1.

[0024] See attached document Figure 1 and attached Figure 2 The elastic sealing assembly includes two second inner conical rings 15, an inner sealing ring 16, and a second elastic element 17. Two inner sealing rings 16 are provided and symmetrically installed on the electric spindle body 1 and located inside the housing 2. The two second inner conical rings 15 are symmetrically arranged on opposite sides of the two inner sealing rings 16 and installed on the electric spindle body 1. The second elastic element 17 is arranged between the two inner sealing rings 16 and sleeved on the electric spindle body 1. The second elastic element 17 is a spring, and the spring rebound force after compression is not less than 150N, thereby ensuring the cooperation between the two inner sealing rings 16 and the two second inner conical rings 15 to achieve sealing of the electric spindle body 1.

[0025] Furthermore, an outer clamping ring 18 for pressing the elastic sealing assembly is installed on the end face of the housing 2 by screws. The outer clamping ring 18 is rotatably engaged with the electric spindle body 1 through a bearing. In this way, the outer clamping ring 18 can be used to press the elastic sealing assembly, thereby ensuring the reverse pushing effect of the second elastic element 17 on the two inner sealing rings 16.

[0026] Furthermore, symmetrical conical rings are rotatably mounted on opposite sides of the two second inner conical rings 15 via bearings, and two inner sealing rings 16 abut against the two conical rings on opposite sides. The inner sealing rings 16 are C-rings or other shrink-type seals, thereby enabling the inner sealing rings 16 to cooperate with the conical parts on the second inner conical rings 15 to achieve inward compression, thereby improving the sealing effect on the electric spindle body 1.

[0027] Furthermore, multiple spacer sealing rings 6 are provided inside the housing 2. Two spacer sealing rings 6 are installed between the outer periphery of the two second inner conical rings 15 and the inner cavity of the housing 2, and another spacer sealing ring 6 is installed between the outer periphery of the first inner conical ring 5 and the inner cavity of the housing 2. The spacer sealing rings 6 are O-rings. In this way, the first inner conical ring 5 and the two second inner conical rings 15 can achieve a sealing effect by using the spacer sealing rings 6.

[0028] Using the above structure, firstly, the electric spindle body 1 is positioned and installed inside the housing 2. For the installation of the front sealing assembly, the inner extension stop ring 3 is first assembled to the front end of the electric spindle body 1 via a bearing. Then, the first elastic element 4 and the first inner conical ring 5 are sequentially installed. Next, the self-retracting sealing ring 7 is installed in an embedded state with the first inner conical ring 5. Finally, the first clamping ring 8 is tightened with screws to press the self-retracting sealing ring 7 and ensure that the spring return force is not less than 150N. For the installation of the magnetohydrodynamic sealing assembly, the washer ring 9 and one of the side retaining rings 10 are first installed. Then, the magnet ring 11 and the magnetic pole ring 12 are alternately installed at the designated positions on the electric spindle body 1. Finally, the installation... Another side retaining ring 10 is positioned by a bearing. After the magnetofluid is filled into the magnetofluid cavity 13, the side retaining ring 10 is tightened by screws using the second clamping ring 14. For the installation of the elastic sealing assembly, two second inner conical rings 15 are symmetrically installed on the electric spindle body 1. An inner sealing ring 16 with a conical ring is placed between the two second inner conical rings 15. After the second elastic element 17 is installed, it is tightened by the outer clamping ring 18 to ensure that the spring rebound force is not less than 150N. When the outer circumference of the first inner conical ring 5 and the two second inner conical rings 15 are installed with the inner cavity of the housing 2, the spacer sealing ring 6 is installed simultaneously. This completes the overall assembly of the three-stage sealing system. Throughout the installation process, it is necessary to ensure that the coaxiality and clamping force of each sealing component meet the design requirements to achieve the optimal sealing effect.

[0029] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. All standard parts used in this application can be purchased from the market, and can be customized according to the description and drawings. The specific connection methods of each part all adopt conventional methods such as bolts, rivets, and welding, which are mature technologies in the prior art. The machinery, parts, and equipment all adopt conventional models in the prior art. This application is mainly used to protect mechanical devices. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, are implemented according to conventional methods in the field.

Claims

1. A low speed high torque electric spindle maintenance free seal structure, characterized by: It includes an electric spindle body (1) and a front end sealing assembly, a magnetic fluid sealing assembly and an elastic sealing assembly disposed on the electric spindle body (1). The electric spindle body (1) is disposed inside a housing (2). The front end sealing assembly, the magnetic fluid sealing assembly and the elastic sealing assembly are all disposed inside the housing (2). The front sealing assembly includes an inner extension stop ring (3), a first elastic element (4), and a self-retracting sealing ring (7). The inner extension stop ring (3) is rotatably mounted on the electric spindle body (1) via a bearing and is located at the front end of the inner cavity of the housing (2). The first elastic element (4) is sleeved on the electric spindle body (1) and is located between the inner extension stop ring (3) and the first inner conical ring (5). The first inner conical ring (5) is mounted on the electric spindle body (1) and is located inside the housing (2). The self-retracting sealing ring (7) is mounted on the electric spindle body (1) and is embedded in the first inner conical ring (5). A first clamping ring (8) for pressing the self-retracting sealing ring (7) is installed inside the housing (2) via screws. The first clamping ring (8) is rotatably engaged with the electric spindle body (1) via a bearing.

2. The low speed, high torque electric spindle maintenance free seal arrangement of claim 1, wherein: The magnetic fluid sealing assembly includes a side ring (10) and a plurality of magnet rings (11). Magnetic pole rings (12) are arranged between adjacent magnet rings (11). The magnet rings (11) and magnetic pole rings (12) are both mounted on the electric spindle body (1). There are two side rings (10) located inside the housing (2). The side rings (10) are rotatably engaged with the electric spindle body (1) through bearings. A magnetic fluid cavity (13) for filling magnetic fluid is provided between the outer periphery of the electric spindle and the magnet rings (11) inside the housing (2).

3. The low speed, high torque electric main shaft maintenance free seal structure of claim 2, wherein: The housing (2) is equipped with a second clamping ring (14) for clamping the side retaining ring (10) by screws. The second clamping ring (14) is rotatably engaged with the electric spindle body (1) by bearings.

4. The low speed, high torque electric main shaft maintenance free seal structure of claim 3, wherein: The elastic sealing assembly includes two second inner conical rings (15), an inner sealing ring (16), and a second elastic element (17). The inner sealing rings (16) are arranged in two and symmetrically installed on the electric spindle body (1) and located inside the housing (2). The two second inner conical rings (15) are symmetrically arranged on opposite sides of the two inner sealing rings (16) and installed on the electric spindle body (1). The second elastic element (17) is arranged between the two inner sealing rings (16) and sleeved on the electric spindle body (1).

5. The low speed, high torque electric main shaft maintenance free seal structure of claim 4, wherein: The end face of the housing (2) is fitted with an outer clamping ring (18) for pressing the elastic sealing assembly by screws. The outer clamping ring (18) is rotatably engaged with the electric spindle body (1) by bearings.

6. The low speed, high torque electric main shaft maintenance free seal structure of claim 5, wherein: Two second inner conical rings (15) are rotatably mounted with symmetrical conical rings on opposite sides via bearings, and the two inner sealing rings (16) abut against the two conical rings on opposite sides respectively.

7. The low speed, high torque electric main shaft maintenance free seal structure of claim 6, wherein: The machine shell (2) is internally provided with multiple interval sealing rings (6), two of which are installed between the outer periphery of the second inner conical ring (15) and the inner cavity of the machine shell (2), and the other one is installed between the outer periphery of the first inner conical ring (5) and the inner cavity of the machine shell (2).

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