Milling head mechanism of high-speed cyclone milling machine

Abstract

The utility model provides a milling head mechanism of a high-speed cyclone milling machine, and belongs to the technical field of worm machining equipment. The problem that a milling head mechanism of an existing cyclone milling machine is poor in waterproof effect is solved. The milling head mechanism of the high-speed whirlwind milling machine comprises a box body, a waterproof plate, a main shaft assembly and a driving motor, a bearing gland is fixedly arranged on the rear side of the box body, a cutter head opening is formed in the waterproof plate, and a waterproof outer ring fixedly connected with the waterproof plate and a waterproof inner ring fixedly connected with the front end of the main shaft assembly are sequentially embedded in the cutter head opening. A first airtight channel is formed between the bearing gland and the box body, a gap is formed between the bearing gland and the rear end of the main shaft assembly, a second roundabout airtight channel is formed, an air inlet hole is further formed in the bearing gland, and the air inlet hole, the first airtight channel and the second airtight channel are sequentially communicated to form an airtight structure. The sealing performance and the waterproof effect of the two ends of the main shaft assembly are better, and cutting fluid entering the box body can be discharged in time.

Description

Technical Field

[0001] This utility model belongs to the technical field of worm gear processing equipment, and relates to a milling head mechanism of a high-speed cyclone milling machine. Background Technology

[0002] A whirl milling machine is a special type of equipment used for machining worm gears. It clamps the workpiece and feeds it at a low speed while the whirl milling head mechanism drives the cutting tool to rotate at a high speed, thus cutting threads on the workpiece.

[0003] To reduce cutting temperature and improve machining efficiency, cutting fluid needs to be continuously poured onto the cutting area and tool during the cutting process. However, the poured cutting fluid splashes in the machining area. Therefore, to prevent cutting fluid and its associated debris from entering the milling head mechanism and affecting machining accuracy and service life, a waterproof structure is required for the milling head mechanism. For example, Chinese patent application (application number: 201710476747.8) discloses a precision cyclone milling head mechanism and its waterproofing method, including a lower support, spindle housing, waterproof plate, upper support, grating, servo motor, waterproof outer ring, waterproof inner ring, spindle pulley, cutter head, synchronous belt, bearing, spindle, bearing cap, and cutting tool. One side of the spindle housing is fitted with the waterproof plate, waterproof outer ring, and waterproof inner ring, and a fluid drainage channel is provided below the spindle housing to drain fluid accumulated on the side of the spindle pulley. On the other side of the spindle housing, a water outlet is provided on the bearing cap. A waterproof groove is provided between the spindle and the bearing cap, communicating with the water outlet and sealed with an airtight structure to achieve a waterproof effect. However, due to the relatively simple airtight structure, its performance was still unsatisfactory during use. Therefore, the inventors made further improvements based on this. Summary of the Invention

[0004] The purpose of this utility model is to address the aforementioned problems in existing technologies by proposing a milling head mechanism for a high-speed cyclone milling machine. The technical problem to be solved by this utility model is: how to improve the waterproof effect of the milling head mechanism of the cyclone milling machine.

[0005] The objective of this utility model can be achieved through the following technical solution: a milling head mechanism for a high-speed cyclone milling machine, comprising a housing with a spindle mounting cavity, a waterproof plate covering the front side of the housing, a spindle assembly rotatably mounted in the spindle mounting cavity via bearings, and a drive motor for driving the spindle assembly to rotate. A bearing cap for abutting against the bearings is fixedly provided on the rear side of the housing. The waterproof plate has a cutter head opening communicating with the spindle mounting cavity, and the cutter head opening is sequentially fitted with a waterproof outer ring fixedly connected to the waterproof plate and a waterproof inner ring fixedly connected to the front end of the spindle assembly.

[0006] The bearing cover and the housing form an airtight channel one surrounding the bearing. The bearing cover and the rear end of the main shaft assembly have gaps that form a meandering airtight channel two. The bearing cover is also provided with an air inlet. The air inlet, airtight channel one and airtight channel two are connected in sequence to form an airtight structure.

[0007] The spindle assembly of this utility model is set inside the spindle mounting cavity of the housing. One end of the spindle assembly is waterproofed by the cooperation of a waterproof outer ring and a waterproof inner ring, and the other end is sealed by an airtight structure. The airtight channel in this utility model adopts a meandering labyrinth-type airtight structure, which makes the airtight channel between the bearing cover and the spindle assembly longer, the sealing range larger, and the gas escape velocity is lower after entering the airtight structure through the air inlet, the residence time in the airtight structure is longer, the pressure in the airtight structure is also greater, the sealing effect is better, and the gas consumption is also lower.

[0008] In the milling head mechanism of the high-speed cyclone milling machine described above, the spindle assembly includes a cutter head, a pulley, and a spindle that are coaxially fixed together along the axial direction. The pulley is connected to the drive motor via belt drive, and the spindle is inserted into a bearing.

[0009] In the milling head mechanism of the high-speed cyclone milling machine described above, an annular groove is formed on the end face of the bearing cover and the side adjacent to the bearing, and the annular groove and the housing form the aforementioned airtight channel one.

[0010] In the milling head mechanism of the high-speed cyclone milling machine described above, the bearing cap is annular, and the inner wall of the bearing cap has an inwardly protruding annular shoulder one. The annular shoulder one has an annular airtight groove. The outer end of the spindle has an outwardly protruding annular shoulder two, which is located outside of the annular shoulder one. The inner side of the annular shoulder two has an annular protrusion partially embedded in the airtight groove. There is a gap between the spindle and the bearing cap, forming the aforementioned airtight channel two. In this way, the airtight channel two is arranged around the annular shoulder one and the airtight groove of the bearing cap, making the length of the airtight channel two longer, and forming multiple angle bends on the airtight channel two, forming multiple seals and a better sealing effect.

[0011] In the milling head mechanism of the high-speed cyclone milling machine described above, there are two air inlets, which are located on both sides of the outer end face of the bearing cover and communicate with the annular groove.

[0012] In the milling head mechanism of the high-speed cyclone milling machine described above, the lower part of the bearing cover is also provided with a drain hole, which is connected to the annular groove.

[0013] In the milling head mechanism of the high-speed cyclone milling machine described above, the waterproof inner ring is fixedly connected to the pulley, and the cutter head is located inside the waterproof inner ring.

[0014] In the milling head mechanism of the aforementioned high-speed cyclone milling machine, the spindle mounting cavity has a stepped shoulder that divides the spindle mounting cavity into a front chamber and a rear chamber. The bearing is located in the rear chamber, and the bottom of the housing is also provided with a drainage groove, which communicates with both the front and rear chambers. The shoulder in the spindle mounting cavity improves the fitting accuracy between the spindle assembly and the spindle mounting cavity, and also allows the cutting fluid entering the spindle mounting cavity to move within a smaller range and be quickly discharged through the drainage groove, further preventing the cutting fluid from contacting the bearing.

[0015] In the milling head mechanism of the high-speed cyclone milling machine described above, the outer end of the waterproof outer ring has an outwardly protruding water-blocking part, which is located on the outside of the waterproof plate and fits against the outer wall of the water-blocking plate. The outer side of the waterproof inner ring has a flange for covering the water-blocking part of the waterproof outer ring, thereby preventing cutting fluid from entering the housing from the gap between the waterproof inner ring and the waterproof outer ring.

[0016] In the milling head mechanism of the aforementioned high-speed cyclone milling machine, two annular waterproof grooves are spaced apart on the outer wall of the waterproof inner ring. The two waterproof grooves cooperate with the inner wall of the waterproof outer ring to form two mechanical seals.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. The front end of the spindle assembly of this utility model is sealed and waterproof by the cooperation of a waterproof outer ring and a waterproof inner ring. The rear end is sealed by a meandering labyrinth-like airtight structure formed by the combination of the housing and the bearing cover with the spindle airtight structure. This creates multiple seals between the bearing cover and the spindle. The airtight channel between the bearing cover and the spindle is longer, the sealing range is larger, the sealing effect is better, and the gas consumption is lower.

[0019] 2. The outer side of the waterproof inner ring is provided with a flange and covers the water-retaining part at the outer end of the waterproof outer ring, thereby hiding the gap between the waterproof inner ring and the waterproof outer ring on the inside, making it difficult for cutting fluid to enter the housing through the gap between the waterproof inner ring and the waterproof outer ring, resulting in better waterproof performance.

[0020] 3. Drainage structures are provided on both the housing and the bearing cap, so that even if the cutting fluid enters the housing, it can be discharged in a timely and efficient manner, avoiding any impact on bearings and other components. Attached Figure Description

[0021] Figure 1 This is a perspective view of the present invention;

[0022] Figure 2 This is a perspective view of the present invention from another angle;

[0023] Figure 3 This is a longitudinal sectional view of the present invention;

[0024] Figure 4 yes Figure 3 Enlarged view of part A in the middle;

[0025] Figure 5 This is a cross-sectional view of the present invention along the transverse direction;

[0026] Figure 6 This is a structural schematic diagram of the spindle assembly;

[0027] Figure 7 This is a schematic diagram of the bearing cap structure.

[0028] In the diagram, 11. Housing; 1a. Spindle mounting cavity; 11a. Drainage groove; 111. Shoulder; 12. Waterproof plate; 2. Drive motor; 31. Spindle; 311. Annular shoulder two; 312. Annular protrusion; 32. Pulley; 33. Cutter head; 4. Bearing; 5. Bearing cover; 51. Annular groove; 52. Annular shoulder one; 53. Air inlet; 54. Drainage hole; 61. Waterproof outer ring; 611. Water-blocking part; 62. Waterproof inner ring; 621. Flanged edge; 622. Waterproof groove; 71. Airtight channel one; 72. Airtight channel two; 81. Upper bracket; 82. Lower bracket. Detailed Implementation

[0029] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0030] A milling head mechanism for a high-speed cyclone milling machine, such as Figure 1 , Figure 2 As shown, the assembly includes a housing 11, a waterproof plate 12 for sealing the front of the housing 11, a spindle assembly rotatably disposed within the housing 11, and a drive motor 2 for driving the spindle assembly to rotate. The spindle assembly has a cutter head 33. The drive motor 2 can drive the spindle assembly to rotate at high speed so that the cutter head on the cutter head 33 can machine the worm gear. The upper and lower ends of the housing 11 are rotatably connected to an upper support 81 and a lower support 82, respectively. A grating is also provided at the connection between the upper support 81 or the lower support 82 and the housing 11 to adjust the cutting angle.

[0031] Specifically, such as Figures 2-6As shown, in this embodiment, the lower part of the housing 11 has a spindle mounting cavity 1a that runs through the front and rear. The spindle assembly includes a cutter head 33, a pulley 32, and a spindle 31. The cutter head 33, the pulley 32, and the spindle 31 are coaxially fixed in sequence along the axial direction. The spindle 31 is rotatably connected to the housing 11 through a bearing 4 fixed in the mounting cavity. The drive motor 2 is located at the upper part of the housing 11 and is connected to the pulley 32 through a belt. A number of cutter heads with inward-facing blades are spaced apart on the inner wall of the cutter head 33. To improve the waterproofing of the cutter head 33 side of the spindle 31 mechanism, in this embodiment, the waterproof plate 12 has a cutter head 33 opening that communicates with the spindle mounting cavity 1a. The cutter head 33 opening is coaxially arranged with the spindle assembly. A waterproof outer ring 61 and a waterproof inner ring 62 are sequentially embedded in the cutter head 33 opening. The waterproof outer ring 61 is attached to the cutter head 33 opening and fixed by bolts. The outer end of the waterproof outer ring 61 has an outwardly protruding water-blocking part 611, which is located on the outside of the waterproof plate 12 and is attached to the outer wall of the water-blocking plate. The waterproof inner ring 62 is fixed to the pulley 32 and has a small gap with the waterproof outer ring 61 so that the waterproof inner ring 62 can rotate relative to the waterproof outer ring 61. The outer side of the waterproof inner ring 62 has a flange 621 for covering the water-blocking part 611 of the waterproof outer ring 61, preventing cutting fluid from entering the housing 11 from the gap between the waterproof inner ring 62 and the waterproof outer ring 61. Furthermore, in this embodiment, two annular waterproof grooves 622 are provided at intervals on the outer wall of the waterproof inner ring 62 to further improve the waterproof effect between the waterproof inner ring 62 and the waterproof outer ring 61.

[0032] like Figure 4 As shown, the inner wall of the spindle mounting cavity 1a is provided with a stepped shoulder 111, which divides the spindle mounting cavity 1a into a front chamber and a rear chamber. The cutter head 33 and the pulley 32 are located in the front chamber, while the bearing 4 and the spindle 31 are located in the rear chamber, further improving the waterproof effect of the rear chamber. Furthermore, a drainage groove 11a is provided at the bottom of the housing 11, which communicates with both the front and rear chambers. This allows the cutting fluid entering the housing 11 to only move within a small range and to be quickly discharged from the drainage groove 11a, avoiding any impact on the bearing 4. In this embodiment, the drainage groove 11a is inclined downwards along the direction from the cutter head 33 to the spindle 31.

[0033] like Figure 5 As shown, the bearing 4 is installed at the rear of the spindle mounting cavity 1a, that is, in the rear cavity. A bearing cover 5 is provided on the rear side of the housing 11. The bearing cover 5 is located on the outside of the bearing 4 and is fixedly connected to the housing 11. The bearing cover 5 abuts against the bearing 4, so that the bearing 4 is pressed and fixed on the housing 11.

[0034] like Figure 5 and Figure 7As shown, an airtight channel 71 is formed between the bearing cap 5 and the housing 11 within the spindle mounting cavity 1a, surrounding the bearing 4. An air inlet 53 is provided on the end face of the bearing cap 5. In this embodiment, two air inlets 53 are spaced apart and communicate with the airtight channel 71. In this embodiment, an annular groove 51 is provided on the end face of the bearing cap 5 adjacent to the bearing 4. The inner wall of the annular groove 51 and the inner wall of the rear chamber form the aforementioned airtight channel 71. The bearing cap 5 is annular, and its inner wall has an annular shoulder 52 protruding radially inward. The annular shoulder 52 has an annular airtight groove. The outer end of the spindle 31 has an outwardly protruding annular shoulder 311. The second shaped shoulder 311 is located outside the annular shoulder 52. The inner edge of the second annular shoulder 311 has an annular protrusion 312 that is adapted to the airtight groove and partially embedded in the airtight groove. There is a gap between the spindle 31 and the bearing cover 5, forming a meandering airtight channel 72, which makes the airtight channel 72 have more large-amplitude bends and a longer sealing passage. The air inlet 53, the first airtight channel 71 and the second airtight channel 72 are connected in sequence to form a labyrinth-like airtight structure. The air inlet 53 is used to connect to an external air source, so that the gas enters the first airtight channel 71 from the air inlet 53 and exits from the second airtight channel 72 between the spindle 31 and the bearing cover 5, preventing cutting fluid or debris from entering between the bearing cover 5 and the spindle 31.

[0035] Furthermore, in order to improve the drainage effect, in this embodiment, a drainage hole 54 is also provided on the side of the lower part of the bearing cover 5, and the drainage hole 54 is connected to the annular groove 51.

[0036] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0037] Although this document frequently uses terms such as housing 11, drive motor 2, main shaft 31, and pulley 32, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A milling head mechanism of a high-speed cyclone milling machine, comprising a box (11) having a spindle mounting cavity (1a), a waterproof plate (12) covering the front side of the box (11), a spindle assembly rotatably arranged in the spindle mounting cavity (1a) through a bearing (4), and a driving motor (2) for driving the spindle assembly to rotate, the rear side of the box (11) is fixedly provided with a bearing gland (5) for abutting against the bearing (4), characterized in that, The waterproof plate (12) is provided with a cutter head (33) opening communicated with the main shaft mounting cavity (1a), and the cutter head (33) opening is sequentially embedded with a waterproof outer ring (61) fixedly connected with the waterproof plate (12) and a waterproof inner ring (62) fixedly connected with the front end of the main shaft assembly. The bearing pressing cover (5) and the box body (11) form an air-tight channel one (71) surrounding the bearing (4), the bearing pressing cover (5) and the rear end of the main shaft assembly have a gap and form an air-tight channel two (72) in turn, and the bearing pressing cover (5) is further provided with an air inlet hole (53), the air inlet hole (53), the air-tight channel one (71) and the air-tight channel two (72) are sequentially communicated and form an air-tight structure.

2. The high speed whirl mill head mechanism of claim 1, wherein, The main shaft assembly comprises the cutter head (33), a belt pulley (32) and a main shaft (31) coaxially and fixedly connected in sequence along the axial direction, the belt pulley (32) is connected with the driving motor (2) through a belt transmission, and the main shaft (31) is inserted into the bearing (4).

3. The high speed whirl mill head mechanism of claim 2, wherein, The end face of the side adjacent to the bearing (4) of the bearing pressing cover (5) is provided with an annular groove (51), and the annular groove (51) and the box body (11) form the air-tight channel one (71).

4. The high speed whirl mill head mechanism of claim 2 or 3, wherein, The bearing pressing cover (5) is annular, the inner wall of the bearing pressing cover (5) has an annular shoulder one (52) protruding inwardly, the annular shoulder one (52) has an annular air-tight groove, the outer end of the main shaft (31) has an annular shoulder two (311) protruding outwardly, the annular shoulder two (311) is located outside the annular shoulder one (52), the inner side of the annular shoulder two (311) has an annular convex part (312) partially embedded in the air-tight groove, and the main shaft (31) and the bearing pressing cover (5) have a gap and form the air-tight channel two (72).

5. The high speed whirl mill head mechanism of claim 4, wherein, The air inlet hole (53) is two, and the two air inlet holes (53) are respectively located on the two sides of the outer end face of the bearing pressing cover (5) and communicated with the annular groove (51).

6. The high speed whirl mill head mechanism of claim 5, wherein, The lower part of the bearing pressing cover (5) is further provided with a drain hole (54), and the drain hole (54) is communicated with the annular groove (51).

7. The high speed whirl mill head mechanism of claim 2, wherein, The waterproof inner ring (62) is fixedly connected with the belt pulley (32), and the cutter head (33) is located inside the waterproof inner ring (62).

8. The high speed whirl mill head mechanism of claim 7, wherein, The outer end of the waterproof outer ring (61) has a water blocking part (611) protruding outwardly, the water blocking part (611) is located outside the waterproof plate (12) and is attached to the outer side wall of the waterproof plate, and the outer side of the waterproof inner ring (62) has a flange (621) for covering the water blocking part (611) of the waterproof outer ring (61).

9. The high speed whirl mill head mechanism of claim 8, wherein, The outer wall of the waterproof inner ring (62) is provided with two annular waterproof grooves (622) at intervals.

10. The high speed whirl mill head mechanism of claim 2, wherein, The main shaft mounting cavity (1a) has a stepped shaft shoulder (111) and is divided into a front chamber and a rear chamber, the bearing (4) is located in the rear chamber, and the bottom of the box body (11) is further provided with a drain groove (11a) communicated with the front chamber and the rear chamber.

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