WATERPROOF ROTARY MILLING HEAD

A waterproof rotary milling head includes a fixed unit, a rotating unit, at least one bearing unit, and a waterproof unit. The rotating unit is rotatable relative to the fixed unit, and the fixed unit and the rotating unit have a gap therebetween. The at least one bearing unit is disposed between the fixed unit and the rotating unit, and provides smooth rotation of the rotating unit relative to the fixed unit. The waterproof unit has an inner guiding conical surface that is disposed outside the at least one bearing unit and that is adjacent to the gap.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to Taiwanese Invention Patent Application No. 112107921, filed on Mar. 3, 2023, the entire disclosure of which is incorporated by reference herein.

FIELD

The disclosure relates to a processing machine, and more particularly to a waterproof rotary milling head.

BACKGROUND

A conventional milling head as disclosed in Chinese Patent Publication No. CN210160422U includes a housing, a cutter handle mounted in the housing, a fixing block connected to the housing, a right fixing plate mounted to the housing, a left fixing plate mounted to the housing, and a sleeve mounted in the housing and protruding out through the left fixing plate. The fixing block has a positioning pin disposed fixedly on an upper end of the fixing block. The fixing block is mounted at the bottom of a main axis of a machine tool, and the cutter handle is driven by the main axis.

Although the aforesaid milling head is commonly used in applications, considering an operating environment where a waterproof design may be needed for the milling head, if an oil seal is used on the milling head, during high rotation of the milling head, the oil seal may experience overheating. In addition, manufacturing tolerance of the oil seal is difficult to control so that sometimes the oil seal may be too tight or too loose. If the manufacturing tolerance of the oil seal exceeds a certain threshold, components of the milling head need to be modified in accordance with the oil seal.

SUMMARY

Therefore, an object of the disclosure is to provide a waterproof rotary milling head that can alleviate at least one of the drawbacks of the prior art.

According to the disclosure, the waterproof rotary milling head includes a fixed unit, a rotating unit, at least one bearing unit, and a waterproof unit.

The rotating unit is rotatable relative to the fixed unit, and the fixed unit and the rotating unit have a gap therebetween.

The at least one bearing unit is disposed between the fixed unit and the rotating unit, and provides smooth rotation of the rotating unit relative to the fixed unit.

The waterproof unit has an inner guiding conical surface that is disposed outside the at least one bearing unit and that is adjacent to the gap.

DETAILED DESCRIPTION

Referring toFIG.1, an embodiment of a waterproof rotary milling head according to this disclosure includes a fixed unit10, three rotating units20,30,40, three bearing units51,52,53, and three waterproof units60,70,80. The waterproof rotary milling head further includes a first shaft1mounted in the fixed unit10, a second shaft2mounted in the fixed unit10, a gear set3mounted in the fixed unit10and disposed between the first shaft1and the second shaft2, and a pad4disposed fixedly inside the fixed unit10. The first shaft1is axially disposed at the pad4. The gear set3includes a first bevel gear301connected to the first shaft1, and a second bevel gear302connected to the second shaft2. The first bevel gear301and the second bevel gear302engage with one another.

Referring toFIGS.1to4, the fixed unit10includes a housing base101, a positioning seat102fixed to the housing base101, an annular cover103positioned relative to the housing base101, and three fixed portions104,105,106. The housing base101has a first annular wall12surrounding a first axis (L1) and defining a first inner hole11, and a second annular wall14surrounding a second axis (L2) perpendicular to the first axis (L1) and defining a second inner hole13. The first inner hole11and the second inner hole13communicate with each other. The first annular wall12has a first inner side surface121adjacent to the first inner hole11, a first outer side surface122opposite to the first inner side surface121, and a top end surface123perpendicularly connected to the first inner side surface121(seeFIG.2). The second annular wall14has a second inner side surface141adjacent to the second inner hole13, a second outer side surface142opposite to the second inner side surface141, a first side end surface143interconnecting the second inner side surface141and the second outer side surface142, and a second side end surface144opposite to the first side end surface143along the second axis (L2) (seeFIGS.3and4). The positioning seat102is mounted at the bottom of a main axis of a machine tool (this part is conventional, so not shown in the figures). The annular cover103is hollow and annular, is positioned relative to the second side end surface144, and is disposed outside the second side end surface144along the second axis (L2). The fixed portion104is located at the first outer side surface122and is adjacent to the top end surface123. The fixed portion105is located at the second inner side surface141and is adjacent to the first side end surface143. The fixed portion106is located at an inner peripheral surface of the annular cover103.

Referring toFIGS.1to4, each of the rotating units20,30,40is rotatable relative to the fixed unit10, and there is a gap between the fixed unit10and each of the rotating units20,30,40. The rotating unit20is hollow, cylindrical, and connected to the first shaft1, and includes a bottom surface21opposite to the top end surface123, and a rotating portion22located beside the bottom surface21and opposite to the fixed portion104(seeFIG.2). The rotating unit30is disc-shaped, is detachably and threadedly connected with the second shaft2, is sleeved on an end opening of the second inner hole13, and includes an outer end surface31perpendicular to the second axis (L2), an inner end surface32opposite to the outer end surface31along the second axis (L2), and a first annular peripheral surface33disposed between the outer end surface31and the inner end surface32(seeFIG.3). The rotating unit40has a protruding annular shape, is integrally formed with the second shaft2, and includes an outer annular surface41intersecting with the second axis (L2), an inner shoulder surface42opposite to the outer annular surface41along the second axis (L2), and a second annular peripheral surface43disposed between the outer annular surface41and the inner shoulder surface42(seeFIG.4).

Each of the bearing units51,52,53is disposed between the fixed unit10and a respective one of the rotating units20,30,40, and provides smooth rotation of the rotating units20,30,40relative to the fixed unit10. The bearing unit51is disposed between the first annular wall12of the fixed unit10and the first shaft1. The bearing unit52is disposed between the second annular wall14of the fixed unit10and the second bevel gear302of the gear set3. The bearing unit53is disposed between the second annular wall14of the fixed unit10and the second shaft2.

Referring toFIG.2, the waterproof unit60includes an annular groove61disposed on the fixed portion104and the rotating portion22, an inner guiding conical surface62disposed outside the bearing unit51and adjacent to a gap between the fixed portion104and the rotating unit20, and an outer guiding conical surface63laterally connected to the rotating portion22at an angle. The annular groove61is cooperatively defined by a first groove portion611that is recessed into the fixed portion104, and a second groove portion612that is recessed into the rotating portion22and that is opposite to the first groove portion611. The inner guiding conical surface62is located between the first groove portion611and the top end surface123, and is disposed on the fixed portion104. The inner guiding conical surface62interconnects the top end surface123and the first outer side surface122, and gradually biases toward the second axis (L2) when extending from the top end surface123toward the first outer side surface122. The outer guiding conical surface63and the inner guiding conical surface62are substantially parallel and are disposed oppositely to each other.

Referring toFIG.3, the waterproof unit70includes an annular groove71recessed into the first annular peripheral surface33, an inner guiding conical surface72disposed outside the bearing unit52and adjacent to a gap between the fixed portion105and the rotating unit30, and an outer guiding conical surface73disposed on the second inner side surface141and laterally connected to the fixed portion105at an angle. The inner guiding conical surface72is disposed between the annular groove71and the inner end surface32, and biases toward the second axis (L2) when extending from the annular groove71toward the inner end surface32. The outer guiding conical surface73and the inner guiding conical surface72are substantially parallel and are disposed oppositely to each other.

Referring toFIG.4, the waterproof unit80includes an annular groove81recessed into the second annular peripheral surface43, an inner guiding conical surface82disposed outside the bearing unit53and adjacent to a gap between the fixed portion106and the rotating unit40, and an outer guiding conical surface83disposed on the fixed portion106. The inner guiding conical surface82is disposed between the annular groove81and the inner shoulder surface42. The inner guiding conical surface82gradually biases toward the second axis (L2) when extending from the annular groove81toward the inner shoulder surface42. The outer guiding conical surface83and the inner guiding conical surface82are substantially parallel and are disposed oppositely to each other.

To further understand the effects produced, the technical means, and the expected effects of various components of the present disclosure, detailed explanations are provided below so that a deeper and more specific understanding of the present disclosure can be obtained thereby.

As shown inFIG.1, when assembly of the waterproof rotary milling head is completed, by virtue of the bearing unit51, the first shaft1and the rotating unit20may be rotated smoothly and axially in the first inner hole11of the housing base101, and the rotating unit20may be rotated relative to the fixed portion104. The second shaft2and the second bevel gear302sleeved thereon may also be rotated smoothly and axially in the second inner hole13of the housing base101by virtue of the bearing unit52and the bearing unit53. Simultaneously, the rotating units30,40are also rotatable with the second shaft2relative to the fixed portions105,106.

When the second shaft2is mounted with a processing tool (not shown) for processing and is cooled by a cutting fluid, by virtue of the waterproof unit60disposed between the fixed portion104and the rotating unit20, the waterproof unit70disposed between the fixed portion105and the rotating unit30, and the waterproof unit80disposed between the fixed portion106and the rotating unit40, a better waterproof effect may be achieved.

That is to say, by virtue of the convoluted design resulting from arrangement of the annular groove61, the inner guiding conical surface62, and the outer guiding conical surface63of the waterproof unit60, the cutting fluid and water may not go straight to an interior of the first inner hole11through the gap between the fixed portion104and the rotating unit20, and water pressure is decreased. Furthermore, by virtue of the conical design of the inner guiding conical surface62and the outer guiding conical surface63, when the first shaft1and the bearing unit51are operated, air generated outwardly from inside may centrifugally throw and discharge water that is about to enter the first inner hole11. Furthermore, the annular groove61serves as a temporary space for storing and discharging the water when a small amount of it enters the annular groove61. By virtue of the wind shear that is generated when the first shaft1and the bearing unit51rotate, a gas curtain is generated, so that the cutting fluid may be blocked outside.

The waterproof units70,80also produce a similar effect as that produced by the waterproof unit60. Air flows generated during operation of the second shaft2, the bearing unit52, and the bearing unit53may also facilitate centrifugal discharging of water that is about to enter the second inner hole13. Furthermore, the annular grooves71,81serve as temporary spaces for storing and discharging the water when a small amount of it enters the annular grooves71,81. By virtue of the wind shear that is generated when the second shaft2, the bearing unit52, and the bearing unit53rotate, a gas curtain is generated, so that the cutting fluid may be blocked outside.

Therefore, in the present disclosure, by virtue of the waterproof units60,70,80, a better waterproof effect is achieved when the rotating units20,30,40rotate relative to the fixed unit10.

It should be noted that the waterproof units60,70,80of this disclosure respectively cooperate with the fixed portions104,105,106of the fixed unit10, and the rotating units20,30,40. The waterproof unit60may also cooperate with the fixed portion104of the fixed unit10and the rotating unit20independently, the waterproof unit70may also cooperate with the fixed portion105of the fixed unit10and the rotating unit30independently, and the waterproof unit80may also cooperate with the fixed portion106of the fixed unit10and the rotating unit40independently. Any two of the abovementioned combinations are also within the scope of the present disclosure.

In summary, the waterproof rotary milling head of the present disclosure has a simple structure and is easy to manufacture and assemble, so the object of the present disclosure is indeed achieved.