Straight milling head with three-toothed disc indexing

Abstract

The present application relates to the technical fields of numerical control machine tool accessory head, in particular to a right angle milling head adopting three toothed disc indexing, comprising a transition plate, a fixed toothed disc, a movable toothed disc, a common toothed disc, a disc sleeve, a vertical shaft sleeve, a transmission shaft and the like; when the lower oil cavity of the locking oil cylinder is filled with oil and the common connecting plate is lifted through the second draw pin, the fixed toothed disc and the movable toothed disc are engaged with the common toothed disc; when the upper oil cavity of the locking oil cylinder is filled with oil and the second draw pin moves downward under the thrust, the common connecting plate and the common toothed disc are disengaged, the inner gear and the outer gear enter the meshing state, and the power of the machine tool spindle drives the spindle box to perform indexing action; since the spindle box and its associated components of the right angle head do not need to perform lifting action during indexing action, the right angle head is more concise and rapid compared with the right angle head adopting double toothed discs; during the working process, the machine tool spindle is always tensioned to the tool holder at the upper part of the right angle head, which can avoid the occurrence of accessory head falling accidents under the conditions of machine tool power failure or loss of hydraulic oil pressure, and improve the safety.

Description

Technical Field

[0001] This invention relates to the field of CNC machine tool accessory head technology, specifically a right-angle milling head with three-tooth indexing. Background Technology

[0002] Configuring various attachment heads is an important means to expand the machining capabilities of CNC gantry milling machines and improve machine tool efficiency. Since five-axis attachment heads are relatively expensive, right-angle heads, extension heads, and other attachment heads that use end gear disc indexing are more widely used in non-complex curved surface machining due to their economic advantages. Currently, right-angle head indexing mainly adopts a double-end gear disc structure. When the gear disc disengages, the machine tool spindle drives its spindle box to rotate for indexing. After it rotates to the correct position, the gear disc locks, and the machine tool power is transmitted to the attachment head spindle body for horizontal or angular surface machining.

[0003] The placement of the double-ended gear discs on the attachment head differs: one method places them on the transition plate on the machine tool ram, where they meet the attachment head, linking indexing and locking. This method is more economical, but installation and adjustment are relatively cumbersome. Another method places the double gear discs inside the attachment head, which is more convenient for users to install, but the overall structure is more complex and the price is relatively higher. Regardless of the placement method chosen, the structure using double gear discs for indexing inevitably requires the gear discs and attachment head housing to separate vertically before locking. Due to the significant friction of the oil distribution ring seal, this process is usually slow. Furthermore, during the entire indexing process, the seal experiences both vertical sliding friction and rotational friction. Summary of the Invention

[0004] To address the problems in the prior art, the present invention provides a right-angle milling head with three-tooth indexing.

[0005] The technical solution adopted by this invention to solve its technical problem is as follows: a right-angle milling head with three-tooth indexing is used, including a transition plate and a spindle box. The transition plate is fixedly installed on the end face of the machine tool slide. Four locking hydraulic cylinders are arranged along the two diagonal directions of the transition plate. A fixed toothed disc is fixedly connected in the central stepped hole of the transition plate. A movable toothed disc is provided on the inner side of the fixed toothed disc. A vertical spindle sleeve is fixedly connected to the spindle box of the right-angle head by a double-ended stud and nut. The movable toothed disc is fixedly connected to the vertical spindle sleeve by a disc sleeve. A common toothed disc is provided on the lower side of the fixed toothed disc and the movable toothed disc. An outer shell is provided on the lower side of the transition plate. A common connecting plate is provided between the outer shell and the transition plate. The common toothed disc is fixedly connected to the common connecting plate. A spindle is provided on the spindle box. A tool-changing cylinder is fixedly connected to the end of the spindle box. Two nozzles are symmetrically provided at the end of the spindle box. A scale is fixedly connected to the outer shell. The scale is rotatably connected to the vertical spindle sleeve.

[0006] Specifically, the common connecting plate is generally square in shape, with grooves machined on its side walls. The square shape of the common connecting plate and the dimensions of its grooves are adapted to the shape and dimensions of the corresponding parts inside the outer shell. A stepped through hole is opened in the center of the common connecting plate, through which the vertical shaft sleeve passes. Countersunk holes and threaded through holes are machined at the four corners of the common connecting plate, and second pull studs are installed in the countersunk holes and threaded through holes of the common connecting plate. A bearing cover is fixedly connected to the lowest stepped surface of the through hole of the common connecting plate, and a flat needle roller bearing is concentrically positioned on the bearing cover. Two second pins are vertically installed on the upper surface of the common connecting plate, and a matching pin sleeve is installed in the hole of the transition plate. A first O-ring seal is fitted on the outer wall of the pin sleeve, and a hexagonal socket head cap set screw is inserted into the transverse hole on the side wall of the pin sleeve and locked by the hexagonal socket head cap set screw.

[0007] Specifically, the vertical shaft sleeve is provided with a connecting sleeve. The vertical shaft sleeve is a stepped rotating body with an array of slots on its upper part. The depth is equivalent to the first step surface, the width is adapted to the stiffener of the connecting sleeve, and the number of slots is the same as the number of stiffeners.

[0008] Specifically, the connecting sleeve includes an inner rotating body, an outer rotating body, and ribs. The inner rotating body is located in the central hole of the vertical shaft sleeve. An internal gear is fixed on the inner rotating body of the connecting sleeve by a stop. The outer rotating body is located outside the vertical shaft sleeve. The outer rotating body and the inner rotating body are connected by several ribs. A first pin is mounted on one of the ribs of the connecting sleeve. An internal hexagon screw and a baffle are fixedly connected to the connecting sleeve to prevent the first pin from retracting. Several blind holes are machined on the first stepped surface of the vertical shaft sleeve. A rectangular spring is installed in the blind holes of the vertical shaft sleeve. The end of the rectangular spring abuts against the lower surface of the connecting sleeve. The rectangular spring causes the upper surface of the connecting sleeve to fit against the flat needle roller bearing through its elastic force.

[0009] Specifically, the upper part of the outer casing is square and the lower part is a cylindrical rotating body. The upper surface of the outer casing is equipped with guide pins and several quick-connect couplings. The internal rotating center part of the outer casing is equipped with a wear-resistant ring and several first rotating rings. The wear-resistant ring and several first rotating rings divide the outer casing into several oil distribution chambers and introduce fluid into the vertical shaft sleeve and the spindle box.

[0010] Specifically, the hydraulic cylinder includes an upper end cover, a lower end cover, a pull claw, and a piston. The piston is equipped with a second rotating ring, which forms two oil chambers on the upper and lower sides of the piston's largest cylindrical surface, respectively.

[0011] Specifically, a set of first angular contact ball bearings is installed back-to-back in the lower part of the central hole of the vertical shaft sleeve. The bearing center of the first angular contact ball bearing is connected to a drive shaft. The outer ring of the first angular contact ball bearing is pressed by an internal hexagon screw through a spacer and an outer pressure cap. The inner ring of the first angular contact ball bearing is pressed by an internal hexagon screw through a spacer, a second arc tooth bevel gear, and a first pressure cap.

[0012] Specifically, a pair of flat keys are installed between the second spiral bevel gear and the drive shaft, and the second spiral bevel gear meshes with the first spiral bevel gear mounted on the main shaft; an external gear is mounted on the uppermost step surface of the drive shaft, and the external gear is adapted to the vertical position of the internal gear. The vertical movement of the common connecting plate determines the disengagement or engagement state of the external gear and the internal gear; a drive disc is installed in the upper center hole of the drive shaft, and a shear pin is installed between the drive shaft and the drive disc. The drive shaft and the drive disc are tightened by a first internal hexagon screw and a washer.

[0013] Specifically, an adjusting shim and a second angular contact ball bearing are placed on the stepped surface of the transmission disk. The inner ring of the second angular contact ball bearing is pressed by a third pressure cap. The third pressure cap is locked onto the transmission disk by a second hexagon socket screw and a washer. The outer ring of the second angular contact ball bearing is locked to the tool holder by the second pressure cap. The tool holder is provided with a pin that passes through the second pressure cap. The transmission disk is provided with a key block, and the pin passes into the key block.

[0014] Specifically, the upper end of the tool holder is equipped with a first pull stud, and the gap between the outer side of the tool holder and the disc sleeve and vertical spindle sleeve is provided with an upper sealing sleeve and a lower sealing sleeve, which together form a labyrinth sealing structure; the lower sealing sleeve is pressed into the lower side of the keyway at the end of the tool holder by a screw, and the position of the screw does not affect the key fit depth at the end of the machine tool spindle; the upper sealing sleeve is fixed in the inner hole of the disc sleeve by a flexible retaining ring; a second O-ring is pressed between the upper sealing sleeve and the transmission disc, and a third O-ring is pressed between the lower sealing sleeve and the tool holder.

[0015] The beneficial effects of this invention are:

[0016] The three-tooth indexing method simplifies the process by requiring only the disengagement of the common toothed disc while maintaining the position of components such as the spindle box. This eliminates the need for a downward disengagement action, making the process simpler and faster. Furthermore, the spacing between the oil distribution rings no longer needs to consider the impact of the spindle box's downward movement, allowing for a smaller spacing, only slightly larger than the diameter of the oil distribution channel. This results in a more compact structure and improved working conditions for the seals. Additionally, during indexing, the weight of the accessory head is supported by the machine tool spindle drawbar disc spring, preventing accidents caused by power outages or hydraulic system depressurization, thus enhancing safety and reliability. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a schematic diagram of the overall structure of a preferred embodiment of the right-angle milling head with three-tooth indexing provided by the present invention.

[0019] Figure 2 This is a schematic diagram of the connection structure between the first pull stud and the knife handle of the present invention;

[0020] Figure 3 This is a schematic diagram of the structure of the common connection plate of the present invention;

[0021] Figure 4 This is a schematic diagram of the connecting sleeve of the present invention;

[0022] Figure 5 This is a schematic diagram of the connection structure between the transition plate and the hydraulic cylinder of the present invention;

[0023] Figure 6 for Figure 1 The diagram shown is an enlarged view of the structure of part A.

[0024] Figure 7 for Figure 2 The diagram shown is an enlarged view of the structure of section B.

[0025] Figure 8 for Figure 2 The diagram shown is an enlarged view of the C-section structure.

[0026] Figure 9 for Figure 2 The diagram shows an enlarged view of the structure of part D.

[0027] In the diagram: 1. Transition plate; 2. Guide pin; 3. Fixed gear plate; 4. Moving gear plate; 5. Common gear plate; 6. Plate sleeve; 7. Common connecting plate; 8. Outer shell; 9. Vertical shaft sleeve; 10. Dial; 11. Nozzle; 12. Main shaft; 13. Spindle box; 14. Tool holder cylinder; 15. First arc bevel gear; 16. First pressure cap; 17. Flat key; 18. Second arc bevel gear; 19. Outer pressure cap; 20. Spacer; 21. First angular contact ball bearing; 22. Drive shaft; 23. Spacer; 24. First socket head cap screw and washer; 25. Drive plate; 26. Second angular contact ball bearing; 27. Second socket head cap screw and washer; 28. First pull stud; 29. ​​Tool holder; 30. Hole retaining ring; 31. Upper sealing sleeve; 32. Lower sealing sleeve; 33. Socket head cap screw and... 34. Baffle plate; 35. Bearing cover; 36. Connecting sleeve; 37. First pin; 38. Rectangular spring; 39. Shear pin; 40. Double-ended stud and nut; 41. Wear ring; 42. First rotating gear ring; 43. External gear; 44. Internal gear; 45. Key block; 46. Second pressure cover; 47. Flat needle roller bearing; 48. Pull pin; 49. Second pin; 50. Hex socket set screw; 51. Hex socket set screw; 52. First O-ring seal; 53. Adjusting shim; 54. Third pressure cover; 55. Second O-ring seal; 56. Third O-ring seal; 57. Hydraulic cylinder; 5701. Upper end cover; 5702. Lower end cover; 5703. Pull claw; 5704. Piston; 5705. Second rotating gear ring; 58. Second pull stud. Detailed Implementation

[0028] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0029] like Figure 1 , Figure 2 and Figure 5As shown, the right-angle milling head with three-tooth indexing according to the present invention includes a transition plate 1 and a spindle box 13. The transition plate 1 is fixedly installed on the end face of the machine tool slide. Four locking hydraulic cylinders 57 are arranged along the two diagonal directions of the transition plate 1. A fixed gear plate 3 is fixedly connected in the central stepped hole of the transition plate 1. A movable gear plate 4 is provided on the inner side of the fixed gear plate 3. A vertical spindle sleeve 9 is fixedly connected to the spindle box 13 of the right-angle head by a double-ended stud and nut 39. The movable gear plate 4 is fixedly connected to the vertical spindle sleeve 9 by a disc sleeve 6. A common gear 5 is provided on the lower side of the fixed gear 3 and the moving gear 4. A housing 8 is provided on the lower side of the transition plate 1. A common connecting plate 7 is provided between the housing 8 and the transition plate 1. The common gear 5 is fixedly connected to the common connecting plate 7. A spindle 12 is provided on the spindle box 13. A tool-changing cylinder 14 is fixedly connected to the end of the spindle box 13. Two nozzles 11 are symmetrically provided at the end of the spindle box 13. A scale 10 is fixedly connected to the housing 8. The scale 10 is rotatably connected to the vertical shaft sleeve 9.

[0030] Specifically, such as Figure 1 , Figure 2 and Figure 3 As shown, the common connecting plate 7 is generally square in shape. The side wall of the common connecting plate 7 is machined with grooves. The size of the square common connecting plate 7 and the grooves thereon are adapted to the shape and size of the corresponding part inside the outer shell 8. The center of the common connecting plate 7 has a stepped through hole through which the vertical shaft sleeve 9 passes. The four corners of the common connecting plate 7 are machined with countersunk holes and threaded through holes. The countersunk holes and threaded through holes of the common connecting plate 7 are provided with second pull studs 58. The lowest stepped surface of the through hole of the common connecting plate 7 is fixedly connected to a bearing cover 34. A flat needle roller bearing 46 is concentrically positioned on the bearing cover 34. Two second pins 48 are vertically installed on the upper surface of the common connecting plate 7. The hole on the transition plate 1 is fitted with a matching pin sleeve 49. The outer wall of the pin sleeve 49 is fitted with a first O-ring seal 52. The horizontal hole on the side wall of the pin sleeve 49 is inserted into a hexagonal socket head cap set screw 51 and locked by a hexagonal socket head cap set screw 50.

[0031] Specifically, such as Figure 1 , Figure 2 and Figure 4As shown, the vertical shaft sleeve 9 is provided with a connecting sleeve 35. The vertical shaft sleeve 9 is a stepped rotating body with an array of slots on its upper part. The depth is equivalent to the first step surface, and the width is adapted to the ribs of the connecting sleeve 35. The number of slots is the same as the number of ribs. The connecting sleeve 35 includes an inner rotating body, an outer rotating body, and ribs. The inner rotating body is located in the center hole of the vertical shaft sleeve 9. An internal gear 43 is fixed on the inner rotating body of the connecting sleeve 35 by a stop. The outer rotating body is located outside the vertical shaft sleeve 9. The outer rotating body and the inner rotating body are connected. The rotating body is connected by several ribs in the middle. One of the ribs of the connecting sleeve 35 is equipped with a first pin 36. The connecting sleeve 35 is fixedly connected with an internal hexagon screw and a baffle 33 to prevent the first pin 36 from retracting. The first stepped surface of the vertical shaft sleeve 9 is machined with several blind holes. A rectangular spring 37 is installed in the blind holes of the vertical shaft sleeve 9. The end of the rectangular spring 37 abuts against the lower surface of the connecting sleeve 35. The rectangular spring 37 makes the upper surface of the connecting sleeve 35 fit against the flat needle roller bearing 46 through its elastic force.

[0032] Specifically, such as Figure 1 , Figure 2 and Figure 8 As shown, the upper part of the outer shell 8 is square and the lower part is a cylindrical rotating body. The upper surface of the outer shell 8 is equipped with guide pins 2 and several quick-connect couplings. The inner rotating center part of the outer shell 8 is equipped with wear-resistant rings 40 and several first rotating grid rings 41. The wear-resistant rings 40 and several first rotating grid rings 41 divide the outer shell 8 into several oil distribution chambers and introduce fluid into the vertical shaft sleeve 9 and the spindle box 13.

[0033] Specifically, such as Figure 5 As shown, the hydraulic cylinder 57 includes an upper end cover 5701, a lower end cover 5702, a pull claw 5703, and a piston 5704. The piston 5704 is equipped with a second rotating ring 5705, which forms two oil chambers on the upper and lower sides of the maximum cylindrical surface of the piston 5704, respectively.

[0034] Specifically, such as Figure 1 and Figure 2As shown, a set of first angular contact ball bearings 21 are mounted back-to-back at the lower part of the center hole of the vertical shaft sleeve 9. The bearing center of the first angular contact ball bearing 21 is connected to the drive shaft 22. The outer ring of the first angular contact ball bearing 21 is pressed by hexagon socket screws through spacer 23 and outer pressure cover 19. The inner ring of the first angular contact ball bearing 21 is pressed by hexagon socket screws through spacer 20, second spiral bevel gear 18 and first pressure cover 16. A pair of flat keys 17 are installed between the second spiral bevel gear 18 and the drive shaft 22. 18 meshes with the first arc-tooth bevel gear 15 mounted on the main shaft 12; an external gear 42 is mounted on the uppermost step surface of the transmission shaft 22, and the external gear 42 is adapted to the vertical position of the internal gear 43. The vertical movement of the common connecting plate 7 determines the disengagement or engagement state of the external gear 42 and the internal gear 43; a transmission disk 25 is installed in the upper center hole of the transmission shaft 22, and a shear pin 38 is installed between the transmission shaft 22 and the transmission disk 25. The transmission shaft 22 and the transmission disk 25 are tightened by a first internal hexagon screw and a washer 24.

[0035] Specifically, such as Figure 1 , Figure 2 and Figure 7 As shown, an adjusting shim 53 and a second angular contact ball bearing 26 are placed on the stepped surface of the transmission disk 25. The inner ring of the second angular contact ball bearing 26 is pressed by a third pressure cap 54. The third pressure cap 54 is locked onto the transmission disk 25 by a second hex socket screw and a washer 27. The outer ring of the second angular contact ball bearing 26 is locked to the tool holder 29 by a second pressure cap 45. The tool holder 29 is provided with a pin 47 that passes through the second pressure cap 45. The transmission disk 25 is provided with a key block 44, and the pin 47 passes into the key block 44. A first pull stud 2 is installed at the upper end of the tool holder 29. 8. An upper sealing sleeve 31 and a lower sealing sleeve 32 are provided in the gap between the outer side of the tool holder 29 and the disc sleeve 6 and the vertical shaft sleeve 9, forming a labyrinth sealing structure with the upper sealing sleeve 31 and the lower sealing sleeve 32; the lower sealing sleeve 32 is pressed by screws on the lower side of the keyway at the end of the tool holder 29, and the position of the screws does not affect the key fit depth at the end of the machine tool spindle; the upper sealing sleeve 31 is fixed in the inner hole of the disc sleeve 6 by a hollow elastic retaining ring 30; a second O-ring 56 is pressed between the upper sealing sleeve 31 and the transmission disc 25, and a third O-ring 55 is pressed between the lower sealing sleeve 32 and the tool holder 29.

[0036] The working states of the right-angle head described in this invention are briefly described below:

[0037] Oil enters the lower oil chamber of the hydraulic cylinder 57, the piston 5704 and the pull claw 5703 move upward, the second pull pin 58 lifts the common connecting plate 7 and the common gear plate 5, and locks them with the fixed gear plate 3 and the moving gear plate 4. The external gear 424 and the internal gear 43 are in a disengaged state. The power of the machine tool spindle 12 is transmitted to the right-angle head spindle 12 through the tool holder 29, the pawl 47, the key block 44, the transmission plate 25, the transmission shaft 22, and the second arc bevel gear 18 and the first arc bevel gear 15. Coolant is provided by the nozzle 11 to perform horizontal machining of the parts.

[0038] Oil enters the upper oil chamber of hydraulic cylinder 57, piston 5704 and pull claw 5703 move downward, second pull pin 58 is pushed, common connecting plate 7 and common gear 5 move downward by about 4mm, which is greater than the meshing height of the three gears by 3.8mm. Common gear 5 disengages, rectangular spring 37 is compressed, connecting sleeve 35 and internal gear 43 move downward accordingly, external gear 42 and internal gear 43 enter the meshing state. The machine tool spindle 12 bears the total compression force of rectangular spring 37 and the weight of accessory head of about 1800N through tool holder 29 and first angular contact bearing 21 and first angular contact bearing 26. At this time, the rotation of machine tool spindle 12 will drive spindle box 13 and vertical spindle sleeve 9 to perform C-axis indexing action. The scale 10 can help the operator judge that the predetermined position has been reached.

[0039] When the right-angle head is in the head magazine, that is, when it is separated from the machine tool (transition plate 1), the rectangular spring 37 always pushes the common connecting plate 7 and the common gear plate 5 upward, so as to be in a relative meshing state with the moving gear plate 4, to ensure that it is in the zero position.

[0040] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0041] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A right angle cutter head employing a three-toothed disc indexing, characterized in that, include: A transition plate (1) and a spindle box (13) are provided. The transition plate (1) is fixedly installed on the end face of the machine tool slide. Four locking hydraulic cylinders (57) are arranged along the two diagonal directions of the transition plate (1). A fixed gear plate (3) is fixedly connected in the central stepped hole of the transition plate (1). A movable gear plate (4) is provided on the inner side of the fixed gear plate (3). A vertical shaft sleeve (9) is fixedly connected to the right-angle head spindle box (13) by a double-ended stud and nut (39). The movable gear plate (4) is fixedly connected to the vertical shaft sleeve (9) by a disc sleeve (6). The fixed gear plate (3) and the movable gear plate (4) are connected by a disc sleeve (6). A common gear plate (5) is provided on the lower side, and an outer shell (8) is provided on the lower side of the transition plate (1). A common connecting plate (7) is provided between the outer shell (8) and the transition plate (1). The common gear plate (5) is fixedly connected to the common connecting plate (7). A spindle (12) is provided on the spindle box (13). A tool-cutting cylinder (14) is fixedly connected to the end of the spindle box (13). Two nozzles (11) are symmetrically provided at the end of the spindle box (13). A scale plate (10) is fixedly connected to the outer shell (8). The scale plate (10) is rotatably connected to the vertical shaft sleeve (9). The common connecting plate (7) is generally square in shape. The side wall of the common connecting plate (7) is machined with grooves. The size of the square common connecting plate (7) and the grooves thereon are adapted to the shape and size of the corresponding part inside the outer shell (8). The common connecting plate (7) has a stepped through hole in the center, through which the vertical shaft sleeve (9) passes. The four corners of the common connecting plate (7) are machined with countersunk holes and threaded through holes. The countersunk holes and threaded through holes of the common connecting plate (7) are provided with second pull studs (58). A bearing cover (34) is fixedly connected to the lowest step surface of the through hole of the connecting plate (7), and a flat needle roller bearing (46) is concentrically positioned on the bearing cover (34); two second pins (48) are vertically installed on the upper surface of the common connecting plate (7), and a pin sleeve (49) that matches it is installed in the hole on the transition plate (1). A first O-ring seal (52) is fitted on the outer wall of the pin sleeve (49), and an internal hexagonal cylindrical end set screw (51) is inserted into the transverse hole of the side wall of the pin sleeve (49) and locked by an internal hexagonal flat end set screw (50); The vertical shaft sleeve (9) is provided with a connecting sleeve (35). The vertical shaft sleeve (9) is a stepped rotating body with an array of slots on its upper part. The depth is equivalent to the first step surface, and the width is adapted to the stiffener of the connecting sleeve (35). The number of slots is the same as the number of stiffeners. The connecting sleeve (35) includes an inner rotating body, an outer rotating body, and ribs. The inner rotating body is located in the center hole of the vertical shaft sleeve (9). An internal gear (43) is fixed on the inner rotating body of the connecting sleeve (35) by a stop. The outer rotating body is located outside the vertical shaft sleeve (9). The outer rotating body and the inner rotating body are connected by several ribs. A first pin (36) is mounted on one of the ribs of the connecting sleeve (35). An internal hexagon screw and a baffle (33) are fixedly connected to the connecting sleeve (35) to prevent the first pin (36) from coming out. Several blind holes are machined on the first step surface of the vertical shaft sleeve (9). A rectangular spring (37) is provided in the blind hole of the vertical shaft sleeve (9). The end of the rectangular spring (37) abuts against the lower surface of the connecting sleeve (35). The rectangular spring (37) makes the upper surface of the connecting sleeve (35) fit against the flat needle roller bearing (46) through elastic force.

2. The right angle cutter head employing tri-dent disc indexing as claimed in claim 1, wherein: The upper part of the outer shell (8) is square and the lower part is a cylindrical rotating body. The upper surface of the outer shell (8) is equipped with guide pins (2) and several quick-connect couplings. The inner rotating center part of the outer shell (8) is equipped with wear-resistant rings (40) and several first rotating rings (41). The wear-resistant rings (40) and several first rotating rings (41) divide the outer shell (8) into several oil distribution chambers and introduce fluid into the vertical shaft sleeve (9) and the spindle box (13).

3. The right-angle milling head with three-tooth indexing as described in claim 1, characterized in that: The hydraulic cylinder (57) includes an upper end cover (5701), a lower end cover (5702), a pull claw (5703), and a piston (5704). The piston (5704) is equipped with a second rotating gear ring (5705), which forms two oil chambers on the upper and lower sides of the largest cylindrical surface of the piston (5704).

4. The right-angle milling head with three-tooth indexing as described in claim 1, characterized in that: A set of first angular contact ball bearings (21) are mounted back-to-back in the lower part of the central hole of the vertical shaft sleeve (9). The bearing center of the first angular contact ball bearing (21) is connected to a transmission shaft (22). The outer ring of the first angular contact ball bearing (21) is pressed by an internal hexagon screw through a spacer (23) and an outer pressure cap (19). The inner ring of the first angular contact ball bearing (21) is pressed by an internal hexagon screw through a spacer (20), a second arc tooth bevel gear (18), and a first pressure cap (16).

5. The right-angle milling head with three-tooth indexing as described in claim 4, characterized in that: A pair of flat keys (17) are installed between the second spiral bevel gear (18) and the drive shaft (22). The second spiral bevel gear (18) meshes with the first spiral bevel gear (15) mounted on the main shaft (12). An external gear (42) is mounted on the uppermost step surface of the drive shaft (22). The external gear (42) and the internal gear (43) are adapted to each other in vertical position. The vertical movement of the common connecting plate (7) determines the disengagement or engagement state of the external gear (42) and the internal gear (43). A drive disk (25) is installed in the upper center hole of the drive shaft (22). A shear pin (38) is installed between the drive shaft (22) and the drive disk (25). The drive shaft (22) and the drive disk (25) are tightened by a first internal hexagon screw and a washer (24).

6. The right-angle milling head with three-tooth indexing as described in claim 5, characterized in that: An adjusting pad (53) and a second angular contact ball bearing (26) are placed on the stepped surface of the transmission disk (25). The inner ring of the second angular contact ball bearing (26) is pressed by a third pressure cover (54). The third pressure cover (54) is locked on the transmission disk (25) by a second internal hex screw and a washer (27). The outer ring of the second angular contact ball bearing (26) is locked to the tool holder (29) by a second pressure cover (45). The tool holder (29) is provided with a pin (47) that passes through the second pressure cover (45). The transmission disk (25) is provided with a key block (44). The pin (47) passes into the key block (44).

7. The right-angle milling head with three-tooth indexing as described in claim 6, characterized in that: The upper end of the tool holder (29) is equipped with a first pull stud (28). The gap between the outer side of the tool holder (29) and the disc sleeve (6) and the vertical shaft sleeve (9) is provided with an upper sealing sleeve (31) and a lower sealing sleeve (32), which together form a labyrinth sealing structure. The lower sealing sleeve (32) is pressed by a screw on the lower side of the keyway at the end of the tool holder (29). The position of the screw does not affect the key fit depth at the end of the machine tool spindle. The upper sealing sleeve (31) is fixed in the inner hole of the disc sleeve (6) by a hole elastic retaining ring (30). A second O-ring seal (56) is pressed between the upper sealing sleeve (31) and the transmission disc (25), and a third O-ring seal (55) is pressed between the lower sealing sleeve (32) and the tool holder (29).

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