Rotating head and spark erosion drilling machine

Abstract

The rotating head comprises a shell, a main shaft is arranged in the shell in the vertical direction, a bearing assembly is arranged between the main shaft and the shell, the bearing assembly comprises a thrust ball bearing, the thrust ball bearing comprises a seat ring and a shaft ring, and the shaft ring is fixedly connected with the main shaft. The gasket is located below the thrust ball bearing, and the seat ring abuts against the lower end face of the gasket. The first deep groove bearing comprises a first outer ring and a first inner ring, the gasket abuts against the upper end face of the first outer ring so that the first outer ring can be tightly pressed on the boss of the shell, the first inner ring is fixedly connected with the main shaft, and a gap is reserved between the first inner ring and the gasket. And the rotating head is matched with a plurality of bearings, so that the rotating continuity and stability of the main shaft are improved.

Description

Technical Field

[0001] This utility model relates to the field of electrical discharge drilling equipment technology, and in particular to a rotating head and an electrical discharge drilling machine. Background Technology

[0002] The rotating head of an EDM (Electrical Discharge Machining) machine mainly consists of two parts: a liquid supply assembly and a rotating part. A transition shaft connects the liquid supply assembly and the rotating part. The transition shaft includes two wear-resistant connecting rods, one above the other, which are fixed to the high-pressure liquid supply assembly and the main shaft, respectively. When the liquid supply assembly supplies liquid, it applies significant axial pressure to the main shaft through the transition shaft. This pressure can cause the bearings between the housing and the main shaft to jam, resulting in vibration or poor rotation of the main shaft. Utility Model Content

[0003] To overcome the above-mentioned shortcomings, the purpose of this utility model is to provide a rotary head and an EDM drilling machine. The rotary head improves the continuity and stability of the spindle rotation through the cooperation of multiple bearings.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is: a rotating head, including a housing, a main shaft arranged vertically inside the housing, and a bearing assembly arranged between the main shaft and the housing, the bearing assembly comprising:

[0005] A thrust ball bearing, comprising a housing ring and a shaft ring, wherein the shaft ring is fixedly connected to the main shaft;

[0006] A gasket, the gasket being located below the thrust ball bearing, with the seat ring abutting against the lower end face of the gasket;

[0007] The first deep groove bearing includes a first outer ring and a first inner ring. The gasket abuts against the upper end face of the first outer ring to press the first outer ring against the boss of the housing. The first inner ring is fixedly connected to the spindle and a gap is left between it and the gasket.

[0008] The beneficial effects of this utility model are as follows: the bearing assembly adds a thrust ball bearing, which can withstand axial load. Then, by pressing the first outer ring of the first deep groove bearing downward through the shim, the axial load of the first deep groove bearing can be shared, avoiding the first deep groove bearings from interleaving and improving the rotational stability of the first deep groove bearing.

[0009] Furthermore, the gasket includes a main body and a boss. The main body is sleeved on the outside of the spindle, and the boss is an annular structure extending downward along the lower end face of the main body. The boss and the first inner ring are staggered in the horizontal direction, and the lower end face of the boss abuts against the first outer ring.

[0010] The structure of the shims evenly distributes the axial force received by the thrust ball bearing onto the first outer ring, pressing the first outer ring so that the first outer ring and the first inner ring are subjected to the same axial force, preventing them from intersecting and causing the first deep groove bearing to jam.

[0011] Furthermore, the bearing assembly also includes a second deep groove bearing, which is located above the thrust ball bearing. The second deep groove bearing and the first deep groove bearing provide support for the rotation of the spindle in the upper and lower parts respectively, improving the stability and smoothness of the spindle rotation.

[0012] Furthermore, an upper oil seal is disposed above the second deep groove bearing, located between the housing and the spindle, and a lower oil seal is disposed below the first deep groove bearing, located between the housing and the spindle. In this configuration, the area between the housing and the spindle is defined by the upper and lower oil seals into a sealed cavity, within which the bearing assembly is located, preventing lubricant leakage from the individual bearings.

[0013] Furthermore, the rotating head also includes a drive mechanism, which comprises a drive member, a driving gear, and a driven gear. The driven gear is coaxially fixed on the main shaft and located above the upper oil seal. The driving gear meshes with the driven gear and is connected to the drive member, which is fixed to the housing. This transmission structure of the driving and driven gears allows the drive member to be located on one side of the main shaft, saving space occupied by rotation in the vertical direction.

[0014] Furthermore, the upper end of the main shaft is detachably connected to a lower connecting shaft coaxial with it, and the lower connecting shaft is provided with an upper connecting shaft abutting against it. The upper connecting shaft is fixed to the housing and connected to the liquid supply assembly. The upper connecting shaft, the lower connecting shaft and the main shaft are coaxially provided with liquid channels that communicate with the liquid supply assembly.

[0015] Furthermore, the liquid supply assembly includes a water inlet valve core located above the upper connecting shaft. The water inlet valve core has a water inlet channel that extends downwards through the valve core and connects to the liquid channel and an external liquid supply pipe. At least one first sealing ring is provided between the water inlet valve core and the upper connecting shaft. The water inlet valve core serves two purposes: firstly, it allows liquid to be supplied through the liquid channel; secondly, compared to a structure with a channel directly on the upper shell, the upper end of the water inlet valve core has no opening, preventing liquid from entering the area of ​​the upper shell where the valve core is located, effectively protecting the spring.

[0016] Furthermore, the liquid supply assembly also includes a spring located above the inlet valve core and always providing a downward force to the inlet valve core.

[0017] Furthermore, the inlet valve core has an inlet hole that communicates with the inlet channel along the radial direction, and a second sealing ring is provided between the inlet valve core and the housing above the inlet.

[0018] This utility model also discloses an electrical discharge machining (EDM) machine, including the aforementioned rotating head. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of the rotating head in an embodiment of this utility model;

[0020] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0021] Figure 3 This is a schematic diagram of the gasket structure in an embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the structure of the water inlet valve core in an embodiment of this utility model.

[0023] In the picture:

[0024] 1. Shell; 11. Boss;

[0025] 2. Main shaft; 21. Lower connecting shaft; 22. Upper connecting shaft; 2a. Liquid passage; 24. Third sealing ring;

[0026] 31. Thrust ball bearing; 311. Seat ring; 312. Shaft ring; 313. First rolling element; 32. Shim; 321. Main body; 322. Boss; 32a. Clearance; 33. First deep groove bearing; 331. First inner ring; 332. First outer ring; 333. Second rolling element; 34. Second deep groove bearing;

[0027] 41. Upper oil seal; 42. Lower oil seal;

[0028] 51. Driving component; 52. Driven gear; 53. Driven gear;

[0029] 6. Inlet valve core; 61. Inlet channel; 62. Inlet hole; 63. First sealing ring; 64. Second sealing ring;

[0030] 7. Spring. Detailed Implementation

[0031] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0032] Example

[0033] See appendix Figure 1 As shown, a rotating head according to this utility model includes a housing 1. A main shaft 2 is arranged vertically inside the housing 1. The main shaft 2 can rotate within the housing 1 along its own axis, and the lower end of the main shaft 2 extends out of the housing 1. A bearing assembly is provided between the main shaft 2 and the housing 1, and the bearing assembly provides guidance and transmission for the rotation of the main shaft 2.

[0034] The bearing assembly includes, from top to bottom, a thrust ball bearing 31, a gasket 32, and a first deep groove bearing 33. (See appendix) Figure 2 As shown, the thrust ball bearing 31 includes a seat ring 311 and a shaft ring 312. A first rolling element 313 rolls between the seat ring 311 and the shaft ring 312. The shaft ring 312 is fixedly connected to the main shaft 2. The shim 32 is located below the thrust ball bearing 31, and the seat ring 311 abuts against the lower end face of the shim 32. The deep groove bearing includes a first outer ring 332 and a first inner ring 331. A second rolling element 333 rolls between the first outer ring 332 and the first inner ring 331. The shim 32 abuts against the upper end face of the first outer ring 332 to press the first outer ring 332 against the boss 11 of the housing 1. The first inner ring 331 is fixedly connected to the main shaft 2 and a gap 32a is left between it and the shim 32.

[0035] In existing technology, a deep groove bearing is simply installed between the housing 1 and the main shaft 2 to achieve a rotational connection between the two. However, during rotation, the main shaft 2 is subjected to significant axial pressure applied to it by the fluid supply assembly. This can cause the inner and outer rings of the deep groove bearing to misalign and shift, leading to jamming of the deep groove bearing and vibration or poor rotation of the main shaft 2. Therefore, a thrust ball bearing 31 is added to the bearing assembly. The thrust ball bearing 31 can withstand the axial load, and the first outer ring 332 of the first deep groove bearing 33 is pressed downward by a shim 32. This can distribute the axial load of the first deep groove bearing 33, prevent the first deep groove bearing 33 from misaligning, and improve the rotational stability of the first deep groove bearing 33.

[0036] In one embodiment, the bearing assembly further includes a second deep groove bearing 34, which is located above the thrust ball bearing. The second deep groove bearing 34 has the same structure as the first deep groove bearing 33, including a second outer ring, a second inner ring, and a third rolling element between them. The second deep groove bearing 34 is located in the upper part of the spindle 2, and the first deep groove bearing 33 is located in the lower part of the spindle 2. These two parts provide support for the rotation of the spindle 2, improving the stability and smoothness of the spindle 2's rotation. A shim 32 and a thrust ball bearing could also be provided above the second deep groove bearing 34, but considering the product's size and cost, providing only a shim 32 and a thrust ball bearing above the first deep groove bearing 33 is sufficient to meet the rotation requirements of the spindle 2.

[0037] See appendix Figure 3As shown, the gasket 32 ​​includes a main body 321 and a boss 322. The main body 321 is sleeved on the spindle 2. The boss 322 is an annular structure extending downward along the lower end face of the main body 321. The boss 322 and the first inner ring 331 are staggered in the horizontal direction. The lower end face of the boss 322 abuts against the first outer ring 332. The lower end face of the boss 322 does not abut against the first inner ring 331, and only the main body 321 is directly above the first inner ring 331.

[0038] In this embodiment, the structure of the shim 32 distributes the axial force received by the thrust ball bearing evenly on the first outer ring 332, presses the first outer ring 332, and ensures that the first outer ring 332 and the first inner ring 331 are subjected to the same axial force, so that they do not overlap and cause the first deep groove bearing 33 to jam.

[0039] The upper end face of the main body 321 is an annular plane, and the lower end face of the boss 322 is also an annular plane. The flatness will affect the uniformity of the applied force.

[0040] See appendix Figure 1 As shown, an upper oil seal 41 is disposed above the second deep groove bearing 34, located between the housing 1 and the spindle 2, and a lower oil seal 42 is disposed below the first deep groove bearing 33, located between the housing 1 and the spindle 2. The area between the housing 1 and the spindle 2 is thus defined by the upper oil seal 41 and the lower oil seal 42 into a sealed cavity, within which the bearing assembly is located, preventing lubricating oil leakage from the individual bearings.

[0041] The rotating head also includes a drive mechanism for driving the main shaft 2 to rotate along its own axis. The drive mechanism includes a drive component 51, a driving gear 52, and a driven gear 53. The driven gear 53 is coaxially fixed to the main shaft 2 and located above the upper oil seal 41. The driving gear 52 meshes with the driven gear and is connected to the drive component 51. The drive component 51 is fixed to the housing 1. By placing the drive component 51 on one side of the main shaft 2, and ensuring that the output shaft of the drive component 51 is not coaxial with the main shaft 2, vertical space is saved.

[0042] The upper end of the main spindle 2 is detachably connected to a lower connecting shaft 21 coaxial with it. An upper connecting shaft 22 is mounted on the lower connecting shaft 21 and abuts against it. The upper connecting shaft 22 is fixed to the housing 1 and connected to the liquid supply assembly. A liquid channel 2a, communicating with the liquid supply assembly, is coaxially arranged on the upper connecting shaft 22, the lower connecting shaft 21, and the main spindle 2. The liquid supply assembly supplies liquid into the liquid channel 2a to meet processing requirements. The upper connecting shaft 22 remains stationary, while the lower connecting shaft 21 and the main spindle 2 rotate synchronously, resulting in relative rotation between them.

[0043] The upper end of the main shaft 2 is threaded with a locking element, which presses the lower connecting shaft 21 against the end of the main shaft 2, thus achieving a detachable connection between the main shaft 2 and the lower connecting shaft 21. To improve the sealing performance at the connection between the lower connecting shaft 21 and the main shaft 2, a third sealing ring 24 surrounding the liquid channel 2a is provided between the lower connecting shaft 21 and the main shaft 2.

[0044] The housing 1 includes a fixedly connected upper and lower housing, with the main shaft 2 housed in the lower housing and the liquid supply assembly housed in the upper housing. The split structure of the housing 1 facilitates the assembly of the rotating head.

[0045] See appendix Figure 1 and attached Figure 4 As shown, the liquid supply assembly includes a water inlet valve core 6 located above the upper connecting shaft 22. The water inlet valve core 6 has a water inlet channel 61, which is coaxial with the liquid supply channel. The water inlet channel 61 extends downwards through the water inlet valve core 6 and communicates with the liquid channel 2a and the external liquid supply pipe. At least one first sealing ring 63 is provided between the water inlet valve core 6 and the upper connecting shaft 22.

[0046] The design of the inlet valve core 6 serves two purposes: firstly, it allows liquid to be supplied through the liquid channel 2a; secondly, unlike structures with channels directly opened on the upper shell, the upper end of the inlet valve core 6 has no opening, preventing liquid from entering the area of ​​the upper shell where the inlet valve core 6 is located, effectively protecting the spring 7. In this situation, the spring 7 will not come into contact with the liquid, significantly increasing its service life.

[0047] The spring 7 is located above the water inlet valve core 6. The spring 7 always provides a downward force to the water inlet valve core 6. The upper end of the spring 7 abuts against the housing 1, and the lower end abuts against the limiting platform of the water inlet valve core 6. The spring 7 is always in a compressed state, pressing the upper connecting shaft 22 onto the lower connecting shaft 21 through the water inlet valve core 6.

[0048] The inlet valve core 6 has a water inlet hole 62 that communicates with the water inlet channel 61 in a radial direction. The upper shell has a water injection channel that communicates with the water inlet hole 62 and is perpendicular to the water inlet channel 61. A second sealing ring 64 is provided between the inlet valve core 6 and the shell 1, located above the water inlet. The second sealing ring 64 prevents liquid in the water inlet channel 61 from entering the space where the spring 7 is located. Two second sealing rings 64 are provided.

[0049] In one embodiment, the present invention further includes an electrical discharge machining (EDM) machine, comprising the aforementioned rotating head.

[0050] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They cannot be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.

Claims

1. A rotating head, comprising a housing, wherein a main shaft is disposed vertically within the housing, and a bearing assembly is disposed between the main shaft and the housing, characterized in that: The bearing assembly includes: A thrust ball bearing, comprising a housing ring and a shaft ring, wherein the shaft ring is fixedly connected to the main shaft; A gasket, the gasket being located below the thrust ball bearing, with the seat ring abutting against the lower end face of the gasket; The first deep groove bearing includes a first outer ring and a first inner ring. The gasket abuts against the upper end face of the first outer ring to press the first outer ring against the boss of the housing. The first inner ring is fixedly connected to the spindle and a gap is left between it and the gasket.

2. The rotating head according to claim 1, characterized in that: The gasket includes a main body and a boss. The main body is sleeved on the outside of the spindle. The boss is an annular structure extending downward along the lower end face of the main body. The boss and the first inner ring are staggered in the horizontal direction. The lower end face of the boss abuts against the first outer ring.

3. The rotating head according to claim 1, characterized in that: The bearing assembly also includes a second deep groove bearing located above the thrust ball bearing.

4. The rotating head according to claim 3, characterized in that: An upper oil seal is provided above the second deep groove bearing, located between the housing and the spindle, and a lower oil seal is provided below the first deep groove bearing, located between the housing and the spindle.

5. The rotating head according to claim 4, characterized in that: The rotating head also includes a drive mechanism, which includes a drive member, a drive gear, and a driven gear. The driven gear is coaxially fixed on the main shaft and located above the upper oil seal. The drive gear meshes with the driven gear and is connected to the drive member. The drive member is fixed on the housing.

6. The rotating head according to any one of claims 1-5, characterized in that: The upper end of the main shaft is detachably connected to a lower connecting shaft coaxial with it. An upper connecting shaft is provided on the lower connecting shaft and abuts against it. The upper connecting shaft is fixed to the housing and connected to the liquid supply assembly. A liquid channel communicating with the liquid supply assembly is provided coaxially on the upper connecting shaft, the lower connecting shaft and the main shaft.

7. The rotating head according to claim 6, characterized in that: The liquid supply assembly includes a water inlet valve core located above the upper connecting shaft. The water inlet valve core has a water inlet channel that extends downward through the water inlet valve core and is connected to the liquid channel and the external liquid supply pipe. At least one first sealing ring is provided between the water inlet valve core and the upper connecting shaft.

8. The rotating head according to claim 7, characterized in that: The liquid supply assembly also includes a spring located above the inlet valve core and always providing a downward force to the inlet valve core.

9. The rotating head according to claim 7, characterized in that: The inlet valve core has an inlet hole that communicates with the inlet channel along the radial direction, and a second sealing ring is provided between the inlet valve core and the housing above the inlet.

10. An electrical discharge machining (EDM) machine, characterized in that: Includes the rotating head as described in any one of claims 1-9.

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