Concentric water-proof mill head structure

Abstract

The utility model discloses concentric waterproof mill head structure relates to the field of machining tool, including: concentric shaft and protection component, the protection component includes: bearing seat, oil seal end cover and waterproof cover, bearing seat inside is connected with the rotation of concentric shaft, bearing seat top is connected with the fixed connection of oil seal end cover, the top of oil seal end cover is fixedly connected with waterproof cover, bearing seat inside is equipped with air channel, bearing gland is provided with in bearing seat bottom, bearing gland inside is equipped with air inlet, air inlet is linked with air channel, bearing seat inside is equipped with flow channel, flow channel is linked with air channel, the utility model discloses can prevent liquid bearing seat in through multilayer protection, improve the service life.

Description

Technical Field

[0001] This utility model relates to the field of machining tools, and in particular to a concentric waterproof grinding head structure. Background Technology

[0002] Grinding heads are commonly used tools for machining, cutting, and surface treatment. Their internal bearings need to withstand high-speed rotation and complex working environments during operation.

[0003] In existing technologies, coolant or water mist is usually used in conjunction with the processing. External liquids can easily enter the bearing cavity, causing the grease to emulsify and fail. At the same time, dust, impurities, etc. may also enter the cavity, leading to increased bearing operating resistance and severe heat generation. In addition, the sealing method of existing grinding head structures is relatively simple, with limited protection effect, making it difficult to guarantee the stability and reliability of the bearing during long-term use. Utility Model Content

[0004] The purpose of this invention is to provide a concentric waterproof grinding head structure, which solves the problem of insufficient protection performance of the grinding head bearing and reduced service life.

[0005] To achieve this objective, the present invention adopts the following technical solution: The concentric waterproof grinding head structure includes: a concentric shaft and protective components; The protective assembly includes: a bearing housing, an oil seal end cap, and a waterproof cap. The bearing housing is rotatably connected to a concentric shaft. The top of the bearing housing is fixedly connected to the oil seal end cap. The top of the oil seal end cap is fixedly connected to the waterproof cap. An air passage is provided inside the bearing housing. A bearing pressure cap is provided at the bottom of the bearing housing. An air inlet is provided inside the bearing pressure cap and communicates with the air passage. A flow channel is provided inside the concentric shaft and communicates with the air passage.

[0006] Preferably, a skeleton oil seal is provided between the oil seal end cap and the inside of the bearing housing.

[0007] Preferably, a deep groove ball bearing is fitted onto the surface of the concentric shaft.

[0008] Preferably, an eccentric spacer is provided between the bottom end of the deep groove ball bearing and the concentric shaft.

[0009] Preferably, an oil injection nozzle is provided on the outer surface of the bearing housing.

[0010] Preferably, the bearing cap is fitted with a first O-ring at both ends.

[0011] Preferably, a second O-ring is fixedly connected to both ends of the bearing housing.

[0012] Compared with the prior art, the present invention has the following beneficial effects: By setting an air passage inside the bearing housing and an air inlet on the bearing cover, and connecting the air inlet to the air passage, and simultaneously opening a flow channel inside the concentric shaft and connecting it to the air passage, an internally connected gas passage is formed. During operation, compressed gas can be sent into the air passage and flow channel through the air inlet and blown out from the waterproof cover, forming an airflow barrier. This structure can effectively prevent external water from entering the bearing cavity when the concentric shaft rotates at high speed, avoiding damage to the bearing due to water immersion, thereby significantly improving the waterproof performance and service life of the grinding head. Attached Figure Description

[0013] 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 these drawings without creative effort.

[0014] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a cross-sectional structural diagram of the eccentric shaft spacer, oil nozzle, and first O-ring of this utility model.

[0016] Illustration: 1. Concentric shaft; 101. Flow channel; 2. Protective component; 201. Bearing housing; 2010. Air passage; 202. Oil seal end cap; 203. Waterproof cap; 204. Bearing gland; 2040. Air inlet; 3. Skeleton oil seal; 4. Deep groove ball bearing; 5. Eccentric shaft spacer; 6. Oil nozzle; 7. First O-ring; 8. Second O-ring. Detailed implementation methods; To make the utility model's objectives, features, and advantages more apparent and understandable, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below 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 skilled in the art without creative effort are within the scope of protection of the present utility model.

[0018] In the description of this utility model, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model 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 this utility model. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component centrally located at the same time.

[0019] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0020] refer to Figure 1-2 As shown, this utility model embodiment provides a concentric waterproof grinding head structure, including: a concentric shaft 1 and a protective component 2; The protective component 2 includes: a bearing housing 201, an oil seal end cap 202, and a waterproof cap 203. The bearing housing 201 is rotatably connected to the concentric shaft 1. The top end of the bearing housing 201 is fixedly connected to the oil seal end cap 202. The top end of the oil seal end cap 202 is fixedly connected to the waterproof cap 203. An air passage 2010 is provided inside the bearing housing 201. A bearing pressure cap 204 is provided at the bottom end of the bearing housing 201. An air inlet 2040 is provided inside the bearing pressure cap 204, which communicates with the air passage 2010. A flow channel 101 is provided inside the concentric shaft 1, which communicates with the air passage 2010.

[0021] First, compressed gas is introduced into the air passage 2010 of the bearing housing 201 through the air inlet 2040 of the bearing cover 204. Then, since the air passage 2010 is connected to the flow channel 101, the compressed gas enters the flow channel 101 from the air passage 2010 and flows out from the flow channel 101. Finally, it is blown out from the waterproof cover 203. When the concentric shaft 1 rotates at high speed, it forms an air wall with the high-pressure gas blown out from the air passage 2010, which can prevent water / liquid sprayed from the outside from entering the interior of the bearing housing 201 and prevent the bearing from being damaged by water immersion.

[0022] refer to Figure 2 As shown, a skeleton oil seal 3 is provided between the oil seal end cap 202 and the interior of the bearing housing 201; the skeleton oil seal 3 is a rubber seal with a metal skeleton, which is commonly used for sealing rotary bearing systems.

[0023] The inner lip of the skeleton oil seal 3 is continuously pressed against the surface of the concentric shaft 1 by its elastic tension and the pressing action of the metal spring (such as a helical spring), forming a dynamic sealing barrier.

[0024] When the concentric shaft 1 rotates, the lip of the skeleton oil seal 3 maintains close contact with the concentric shaft 1, and at the same time, a "liquid seal" is formed by the oil film, which effectively prevents the leakage of bearing lubricating oil / grease, and prevents external dust, moisture and other contaminants from entering the bearing cavity.

[0025] refer to Figure 2 As shown, a deep groove ball bearing 4 is sleeved on the surface of the concentric shaft 1. The deep groove ball bearing 4 consists of an inner ring, an outer ring, rolling elements (steel balls), and a cage.

[0026] When the concentric shaft 1 rotates, it drives the inner ring of the deep groove ball bearing 4 to rotate together. The steel balls roll between the inner and outer rings, converting sliding friction into rolling friction, thereby greatly reducing the frictional resistance between the bearing and the bearing housing 201 and achieving efficient and stable rotation.

[0027] refer to Figure 2 As shown, an eccentric shaft spacer 5 is provided between the bottom end of the deep groove ball bearing 4 and the concentric shaft 1.

[0028] When the concentric shaft 1 drives the inner ring of the deep groove ball bearing 4 to rotate, the concentric shaft 1 will also drive the eccentric shaft spacer 5 to rotate around its own center. Since its inner hole is not concentric with the outer circle, the bearing or the concentric shaft 1 will have a slight radial offset.

[0029] refer to Figure 2 As shown, an oil injection nozzle 6 is provided on the outer surface of the bearing housing 201.

[0030] Before the concentric shaft 1 drives the deep groove ball bearing 4 to rotate, the grease nipple 6 is pressurized manually using a grease gun, grease pump or other equipment to force the lubricating oil or grease into the grease nipple 6. The lubricant then enters the rolling contact area between the bearing rolling elements, inner ring and outer ring of the deep groove ball bearing 4 through the internal channel. The injected lubricant diffuses with the lubrication channel during the operation of the deep groove ball bearing 4 by means of centrifugal force, forming an oil film, which effectively reduces the coefficient of friction, reduces temperature rise and reduces wear.

[0031] refer to Figure 2 As shown, the bearing cap 204 has first O-rings 7 fitted at both ends.

[0032] The first O-ring 7 is deformed by the pressure cap during assembly, creating a tight elastic seal with the contact surface. A first O-ring 7 is provided at each end of the pressure cap. The inner first O-ring 7 prevents lubricant from flowing out of the bearing cavity, while the outer first O-ring 7 prevents foreign objects from entering from the outside, thus forming a bidirectional seal.

[0033] refer to Figure 2 As shown, the two ends of the bearing housing 201 are fixedly connected with second O-rings 8.

[0034] A second O-ring 8 is provided at both ends of the bearing housing 201 to form a symmetrical sealing structure. The second O-ring 8 is elastic and will deform moderately after pressing, which can absorb the small tolerances or thermal expansion differences between the bearing housing 201 and the mating parts, thereby improving the sealing fit and reliability.

[0035] It should be noted that both the first O-ring 7 and the second O-ring 8 mentioned above are sealing rubber rings.

[0036] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A concentric waterproof grinding head structure, characterized in that, include: Concentric shaft (1) and protective assembly (2); The protective component (2) includes: a bearing housing (201), an oil seal end cap (202), and a waterproof cap (203). The bearing housing (201) is rotatably connected to the concentric shaft (1). The top of the bearing housing (201) is fixedly connected to the oil seal end cap (202). The top of the oil seal end cap (202) is fixedly connected to the waterproof cap (203). An air passage (2010) is provided inside the bearing housing (201). A bearing cover (204) is provided at the bottom of the bearing housing (201). An air inlet (2040) is provided inside the bearing cover (204). The air inlet (2040) is connected to the air passage (2010). A flow channel (101) is provided inside the concentric shaft (1). The flow channel (101) is connected to the air passage (2010).

2. The concentric waterproof grinding head structure according to claim 1, characterized in that, A skeleton oil seal (3) is provided between the oil seal end cap (202) and the bearing housing (201).

3. The concentric waterproof grinding head structure according to claim 1, characterized in that, The concentric shaft (1) is fitted with a deep groove ball bearing (4).

4. The concentric waterproof grinding head structure according to claim 3, characterized in that, An eccentric shaft spacer (5) is provided between the bottom end of the deep groove ball bearing (4) and the concentric shaft (1).

5. The concentric waterproof grinding head structure according to claim 1, characterized in that, The bearing housing (201) is provided with an oil injection nozzle (6) on its outer surface.

6. The concentric waterproof grinding head structure according to claim 1, characterized in that, The bearing cap (204) is fitted with first O-rings (7) at both ends.

7. The concentric waterproof grinding head structure according to claim 5, characterized in that, The bearing housing (201) has two fixed connections at both ends, with a second O-ring (8).

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